CS Colloquium Series @ UCY

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CS Colloquium Series - Department of Computer Science - University of Cyprus

The Department of Computer Science at the University of Cyprus holds research colloquiums and social hours approximately once weekly. All university students, faculty, and staff are invited to attend. Notifications about new and upcoming events are automatically disseminated to a variety of institutional lists. If you don't receive these notifications, but want to get informed about upcoming colloquium announcements, you can do the following:


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  • The CS Colloquium Series is sponsored by a generous donation from Microsoft

    Colloquium Coordinator: Demetris Zeinalipour


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    Upcoming and Past Colloquiums


    Colloquium: Load Management for Big Streaming Data, Prof. Panos K. Chrysanthis (University of Pittsburgh, USA), Thursday, July 31, 2014, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Load Management for Big Streaming Data

    Speaker: Prof. Panos K. Chrysanthis
    Affiliation: University of Pittsburgh, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, July 31, 2014
    Time: 11:00-12:00 EET
    Host: Demetris Zeinalipour (dzeina-AT-cs.ucy.ac.cy) and George Samaras (cssamara-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2014.chrysanthis

    Abstract:
    For the past few years, our group has been working on problems related to Big Data through several projects. After briefly discussing these projects, the rest of this talk will present DILoS, which focuses on three of the eight Big Data's Vs, i.e., volume, velocity and variability. Today, the ubiquity of sensing devices as well as of mobile and web applications continuously generates a huge volume of data which takes the form of streams that are typically high-velocity (speed) and high-variability (bursty). In order to meet the near-real-time requirements of the monitoring applications and of the emerging ``Big Data'' applications, data streams need to be continuously processed and analyzed. Such processing happens inside Data stream management systems (DSMSs), which efficiently support continuous queries (CQs). CQs inherently have different levels of criticality and hence different levels of expected quality of service (QoS) and quality of data (QoD). In order to provide different quality guarantees to different client stream applications, we developed DILoS, a novel framework that exploits the synergy between scheduling and load shedding in DSMS. In overload situations, DILoS enforces worst-case response times for all CQs while providing prioritized QoD, i.e., minimize data loss for query classes according to their priorities. We further propose ALoMa, a new adaptive load manager scheme that enables the realization of the DILoS framework. ALoMa is a general, practical DSMS load shedder that outperforms the state-of-the-art in deciding when the DSMS is overload and how much load needs to be shed. We implemented DILoS in our real DSMS prototype system (AQSIOS) and evaluate its performance for a variety of real and synthetic workloads. Our experiments show that our framework (1) allows the scheduler and load shedder to consistently honor CQs' priorities and (2) maximizes the utilization of the system processing capacity to reduce load shedding.

    Short Bio:
    Dr. Panos K. Chrysanthis is a Professor of Computer Science and the founding director of the Advanced Data Management Technologies Laboratory (ADMT Lab) [http://db.cs.pitt.edu] at the University of Pittsburgh. His lab has a broad focus on user-centric data management for scalable network-centric and collaborative applications and has fostered interdisciplinary collaborations between computer science, medicine and astronomy, both within and outside the University of Pittsburgh -- he is an Adjunct Professor at the Carnegie Mellon University and at the University of Cyprus, Cyprus. In 1995, he received one of the first NSF CAREER Awards for his pioneer work on mobile data management and in 2010, he was recognized as a Distinguished Scientist by ACM. In 2007, he was also elevated to the level of a Senior Member of IEEE. He is currently on the editorial board of IEEE TKDE and the Parallel and Distributed Databases Journal. DILoS was developed in collaboration with Thao N. Pham (as part of her PhD thesis) and Alexandros Labrinidis who is the co-director of the ADMT lab. This work has been funded in part by two NSF Awards and a gift from EMC/Greenplum.

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    Calendar: http://www.cs.ucy.ac.cy/colloquium/schedule/cs.ucy.2014.chrysanthis.ics

    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: ASEME - A Model-Driven Agent-Oriented Software Engineering Methodology, Dr. Nikolaos Spanoudakis (Technical University of Crete, Greece), Wednesday, May 28, 2014, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    ASEME - A Model-Driven Agent-Oriented Software Engineering Methodology

    Speaker: Dr. Nikolaos Spanoudakis
    Affiliation: Technical University of Crete, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, May 28, 2014
    Time: 11:00-12:00 EET
    Host: Antonis Kakas (antonis-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2014.spanoudakis

    Abstract:
    Το σεμινάριο αυτό παρουσιάζει από τη μια πλευρά την Γλώσσα Μοντελοποίησης Πρακτόρων (Agent Modeling Language - AMOLA) για τη μοντελοποίηση Συστημάτων Πολλαπλών Πρακτόρων (Multi-Agent Systems - MAS) και από την άλλη πλευρά την Μεθοδολογία Ανάπτυξης Πρακτοροστραφών Συστημάτων (Agent Systems Engineering Methodology - ASEME). Η AMOLA παρέχει το συντακτικό και την σημασιολογία για τη δημιουργία μοντέλων πολυπρακτορικών συστημάτων που καλύπτουν τις φάσεις ανάλυσης και σχεδιασμού μιας διαδικασίας ανάπτυξης λογισμικού. Υποστηρίζει μια τμηματική προσέγγιση στον σχεδιασμό του πράκτορα και εισάγει τις έννοιες του ενδοπρακτορικού και διαπρακτορικού ελέγχου (intra-and inter-agent control). Η πρώτη ορίζει τη συμπεριφορά του πράκτορα με το συντονισμό των διαφόρων τμημάτων που ορίζουν τις ικανότητές του, ενώ η δεύτερη καθορίζει τα πρωτόκολλα που διέπουν το συντονισμό της κοινωνίας των πρακτόρων. Η φάση της ανάλυσης βασίζεται στις έννοιες της ικανότητας και της λειτουργικότητας. Η AMOLA ασχολείται τόσο με την ατομική όσο και με την κοινωνική πτυχή των πρακτόρων, επιτρέποντας στα πρωτόκολλα και στις ικανότητες να ενσωματωθούν στη φάση του σχεδιασμού. Αυτή είναι η πρώτη πρωτοτυπία αυτής της εργασίας, το γεγονός ότι το μοντέλο διαπρακτορικού ελέγχου ορίζεται με τον ίδιο φορμαλισμό με το μοντέλο ενδοπρακτορικού ελέγχου, επιτρέποντας έτσι την ενσωμάτωση του πρώτου στο δεύτερο, μετατρέποντας την συμμετοχή του πράκτορα σε κάποιο πρωτόκολλο σε ικανότητα του πράκτορα. Η ASEME εφαρμόζει μια οδηγούμενη από μοντέλα διαδικασία ανάπτυξης συστημάτων (model-driven engineering), η οποία προβλέπει ότι τα μοντέλα της προηγούμενης φάσης ανάπτυξης μετατρέπονται στα μοντέλα της επόμενης φάσης. Αυτή είναι η δεύτερη πρωτοτυπία αυτής της δουλειάς, το γεγονός ότι τα διαφορετικά μοντέλα δημιουργούνται για κάθε φάση της ανάπτυξης και η μετάβαση από το ένα στάδιο στο άλλο υποβοηθείται από εργαλεία αυτόματης μετατροπής μοντέλων. Aυτή η μετατροπή μπορεί να είναι από μοντέλο σε μοντέλο (Model to Model - M2M), από κείμενο σε μοντέλο (Text to Model - Τ2Μ) και από μοντέλο σε κείμενο (Model to Text - M2T), ενώ μια σειρά τέτοιων μετασχηματισμών οδηγούν από την καταγραφή των απαιτήσεων στο τελικό πρόγραμμα υπολογιστή. Το ανεξάρτητο πλατφόρμας μοντέλο (Platform Independent Model - PIM) που είναι η έξοδος από τη φάση του σχεδιασμού της ASEME είναι ένα διάγραμμα καταστάσεων (statechart) που μπορεί να υλοποιηθεί σε διάφορες πλατφόρμες που χρησιμοποιούν υπάρχοντα εργαλεία CASE και σε μια πρακτοροστραφή πλατφόρμα, την Java Agent Development Framework (JADE). Η ASEME και AMOLA έχουν χρησιμοποιηθεί για την ανάπτυξη πληροφοριακών συστημάτων και για την ανάπτυξη συμπεριφοράς ρομπότ για τον διαγωνισμό RoboCup.

    Short Bio:
    Ο Νίκος Σπανουδάκης έχει κάνει το διδακτορικό του στον χώρο της Επιστήμης των Υπολογιστών στο Πανεπιστήμιο Paris Descartes (Γαλλία). Έχει Μεταπτυχιακό Δίπλωμα Ειδίκευσης στην Οργάνωση και Διοίκηση από το Πολυτεχνείο Κρήτης (2001) και Δίπλωμα Μηχανικού Ηλεκτρονικών Υπολογιστών και Πληροφορικής από το Πανεπιστήμιο Πατρών (1997). Τα ερευνητικά του ενδιαφέροντα εστιάζονται στο χώρο της τεχνολογίας πρακτόρων (agent technology), της μηχανικής λογισμικού (software engineering) και σε εφαρμογές της τεχνητής νοημοσύνης. Κατέχει θέση ΕΕΔΙΠ ΙΙ στο Γενικό Τμήμα του Πολυτεχνείου Κρήτης και στο παρελθόν έχει εργαστεί ως τεχνικός διευθυντής και διευθυντής ερευνητικών έργων πληροφορικής, ως σύμβουλος επιχειρήσεων σε θέματα πληροφορικής και ως προγραμματιστής-αναλυτής συστημάτων. Είναι μέλος της IEEE, της ACM, της Ελληνικής Εταιρίας Τεχνητής Νοημοσύνης (ΕΕΤΝ), του Τεχνικού Επιμελητηρίου Ελλάδας (ΤΕΕ). Περισσότερα στο http://users.isc.tuc.gr/~nispanoudakis

    Web: http://www.cs.ucy.ac.cy/colloquium/
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    Calendar: http://www.cs.ucy.ac.cy/colloquium/schedule/cs.ucy.2014.spanoudakis.ics

    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Wealth, Innovation, Design, & Economic Growth … and How it Begins with Entrepreneurship, Prof. Bruce Jacob (University of Maryland - College Park, USA), Thursday, May 8, 2014, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Wealth, Innovation, Design, & Economic Growth … and How it Begins with Entrepreneurship

    Speaker: Prof. Bruce Jacob
    Affiliation: University of Maryland - College Park, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, May 8, 2014
    Time: 11:00-12:00 EET
    Host: Paraskevas Evripidou (skevos-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2014.jacob

    Abstract:
    In every era, manufacturing has been pushed to the fringes of society, away from living and communal spaces. Factories have been moved away from dense urban areas; manufacturing has been exported to the third world. On the other hand, design has never been pushed away; design has never been exported, except to the detriment of the exporter. Design is the core intellectual exercise that can define a company, an industry, a culture, a nation. Assuming you consider yourself an innovator, if you give design over to a third party, you have given away your reason for being—anything else you bring to the table can be bought; all else but design is a commodity. One enabling trend today is manufacturing as a service, a phenomenon increasing in both visibility and popularity. One consequence of the Internet and the international competition it has enabled (e.g., Friedman 2005) is the number of plants offering custom manufacturing at wholesale prices. Manufacturing as a service significantly lowers barriers-to-entry, enabling start-ups with good design principles to compete with larger companies. It also allows established companies to focus more attention on technology innovation. In general, offloading manufacturing enables a company to spend less capital on infrastructure and less attention on manufacturing. Rather than exploiting these trends merely to cut costs, an organization can instead spend the freed capital and attention on R&D, innovation, and quality assurance, as these form the core intellectual value-added that ultimately make or break a company.

    Short Bio:
    Bruce Jacob is a Keystone Professor of Electrical and Computer Engineering and former Director of Computer Engineering at the University of Maryland in College Park. He received the AB degree in mathematics from Harvard University in 1988 and the MS and PhD degrees in CSE from the University of Michigan in Ann Arbor in 1995 and 1997, respectively. He holds several patents in the design of circuits for electric guitars and started a design company around them. He also worked for two successful startup companies in the Boston area: Boston Technology and Priority Call Management. At Priority Call Management he was the initial system architect and chief engineer. He is a recipient of a US National Science Foundation CAREER award for his work on DRAM, and he is the lead author of an absurdly large book on the topic of memory systems. His research interests include memory systems, operating systems, distributed systems, and designing electric guitars.

    Web: http://www.cs.ucy.ac.cy/colloquium/
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    Calendar: http://www.cs.ucy.ac.cy/colloquium/schedule/cs.ucy.2014.jacob.ics

    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Running with scissors - Fast queries on just-in-time databases, Prof. Anastasia Ailamaki (École Polytechnique Fédérale de Lausanne, Switzerland), Wednesday, May 7, 2014, 10.30-11.30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Running with scissors - Fast queries on just-in-time databases

    Speaker: Prof. Anastasia Ailamaki
    Affiliation: École Polytechnique Fédérale de Lausanne, Switzerland
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, May 7, 2014
    Time: 10.30-11.30 EET
    Host: Demetris Zeinalipour (dzeina-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2014.ailamaki

    Abstract:
    The amount of data collected in the last two years is higher than the amount of data collected since the dawn of time. We collect data much faster than they can be transformed into valuable information and are often forced into hasty decisions on which parts to discard, potentially throwing away valuable data before it has been exploited fully. The reason is that query processing, which is the mechanism to squeeze information out of data, becomes slower as datasets grow larger. At the same time, the continuously increased number of hardware contexts ends up slowing processing down further, as keeping all cores busy with doing useful computation is difficult. Today's query engines cannot harness but a fraction of the potential of new hardware platforms. Is it possible to decouple query processing efficiency from the data growth curve? This talk advocates a departure from the traditional "create a database, then run queries" paradigm. Instead, data analysts should run queries on raw data, while a database is built on the side. In fact the database should become an implementation detail, imperceptible by the user. To achieve this paradigm shift, query processing should be decoupled from specific data storage formats. Ad-hoc primitives and dynamically synthesized operators are key for just-in-time query optimization and processing. Finally, exploitation of compute and memory resources should be seamless and based on hardware hints; extreme vertical integration is an enemy to forward compatibility.

    Short Bio:
    Anastasia Ailamaki is a Professor of Computer and Communication Sciences at the Ecole Polytechnique Federale de Lausanne (EPFL) in Switzerland. Her research interests are in database systems and applications, and in particular (a) in strengthening the interaction between the database software and emerging hardware and I/O devices, and (b) in automating data management to support computationally- demanding and data-intensive scientific applications. She has received an ERC Consolidator Award (2013), a Finmeccanica endowed chair from the Computer Science Department at Carnegie Mellon (2007), a European Young Investigator Award from the European Science Foundation (2007), an Alfred P. Sloan Research Fellowship (2005), eight best-paper awards in database, storage, and computer architecture conferences (2001-2012), and an NSF CAREER award (2002). She holds a Ph.D. in Computer Science from the University of Wisconsin-Madison in 2000. She is a senior member of the IEEE and a member of the ACM, serves as the ACM SIGMOD vice chair, and has served as a CRA-W mentor.

    Video Online:
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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Investment into Advanced Technology in Manufacturing Companies, Prof. Josef Hynek (University of Hradec Králové, Czech Republic), Thursday, April 10, 2014, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Investment into Advanced Technology in Manufacturing Companies

    Speaker: Prof. Josef Hynek
    Affiliation: University of Hradec Králové, Czech Republic
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, April 10, 2014
    Time: 11:00-12:00 EET
    Host: Yanos Sazeides (yanos-AT-cs.ucy.ac.cy) and Andreas Kyprianou (akyp-AT-ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2014.hynek

    Abstract:
    We are surrounded by technology and it is without any doubt that some pieces of technology are strongly associated with our social status or our social aspirations. We prefer to have the latest mobile phone, netbook or tablet. We do not mind that we are unable to utilize half of its features but we simply need it. And we are willing to pay for that. Industrial companies in economically developed countries rely on utilization of modern technology too. They are pushed to cut the cost whenever it is possible and one would expect that their decisions about technology would be based on clear calculations and that some sophisticated methods must be used there. Taking into account the amount of money that is invested into manufacturing technology worldwide it is an interesting issue to learn more about the relevant decision making processes. We studied the problems intensively for more than a decade and selected results of our research will be presented at the seminar.

    Short Bio:
    Prof. RNDr. Josef Hynek, MBA, Ph.D, is the Rector of the University of Hradec Králové. His background is in theoretical cybernetics (Charles University in Prague) and information management (University of Hull, UK). He was a member of the founding team that established Faculty of Informatics and Management of the University of Hradec Kralove in 1993 and he served two terms as the dean of the school there. His research team carried out several international scientific projects in the field of the advanced manufacturing technology utilization. He is a member of IEEE (Institute of Electrical Engineering), ALP (Association for Logic Programming), and member of the scientific board of several Czech universities. He is the finalist of the “Manager of the year 2010” competition and his leadership skills were also appreciated by Microsoft Corporation within the project Heroes Happen Here in 2008.

    Note:
    The colloquium is jointly organized by the Department of Computer Science at the University of Cyprus and the Department of Mechanical and Manufacturing Engineering at the University of Cyprus.

    Web: http://www.cs.ucy.ac.cy/colloquium/
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    Calendar: http://www.cs.ucy.ac.cy/colloquium/schedule/cs.ucy.2014.hynek.ics

    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: The Practical Challenges of Heterogeneous Architectures, Ronny Ronen (Intel Haifa, Israel), Friday, March 28, 2014, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    The Practical Challenges of Heterogeneous Architectures

    Speaker: Ronny Ronen
    Affiliation: Intel Haifa, Israel
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, March 28, 2014
    Time: 11:00-12:00 EET
    Host: Yanos Sazeides (yanos-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2014.ronen

    Abstract:
    The performance of general purpose computers has increased exponentially in the last decades, fueling the entire computer industry and bringing unthinkable capabilities to mankind. This trend was weakened significantly due to physical limitation – particularly power. Heterogeneous architectures were introduced to stretch the trend. Heterogeneous system addresses different usages by different architectures specialized to a certain need or working conditions. Two Interesting heterogeneous architectures are (1) Accelerators (e.g., Gfx/GPGPU) and (2) performance & energy efficient coupling (e.g., big/little cores). The talk will focus on the practical challenges of building heterogeneous architectures. We will describe ideal “clean slate” scenarios and explain the pitfalls we see when trying to evolve an heterogonous system from existing architecture and OS. We will discuss the challenges stemming from (e.g.) using off-the-shelf OS, bridging ISA differences, addressing interactions granularity, sharing virtual memory, and more. The challenges are intriguing, so are some of the solutions.

    Short Bio:
    Ronny joined Intel in 1980. He is now the Intel Principal Investigator (PI) of the Intel Collaborative Research Institute for Computational Intelligence (ICRI-CI) focusing on research on machine learning, brain inspired computing and computer architecture. Until 2011 Ronny was a senior staff architect in the Processor Architecture department at the Intel Israel Development Center in Haifa, focusing on IA32 performance, power awareness and programming models. Ronny was heavily involved in the definition stages of the Intel Pentium M processor family and its successors – the Intel® Core™ Microarchitecture – including “Merom”, “Sandy Bridge”, and the "yet to come" future processors. Prior to his microarchitecture activities, Ronny led the Pentium® Processor compiler and performance simulation activities in the Intel Israel Software department in Haifa. Before that he was involved in many software projects, among them the development of software development tools for the 8051 microcontroller, hosting of Intel tools on the VAX/VMS environment, leading the iRMX-286 R2.0 OS development, and leading the development of i860 software development tools. Ronny received his B.Sc. and M.Sc. degrees in Computer Science from the Technion in Haifa in 1978 and 1979 respectively. Ronny holds over 50 US patents and has published over 15 papers. Ronny is an Intel Senior Principal Engineer and a Fellow of the IEEE.

    Web: http://www.cs.ucy.ac.cy/colloquium/
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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Adaptive Memory Systems for Heterogeneous Memories and Processors, Dr. Mattan Erez (University of Texas at Austin, USA), Friday, March 7, 2014, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Adaptive Memory Systems for Heterogeneous Memories and Processors

    Speaker: Dr. Mattan Erez
    Affiliation: University of Texas at Austin, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, March 7, 2014
    Time: 11:00-12:00 EET
    Host: Yanos Sazeides (yanos-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2014.erez

    Abstract:
    The memory system continues to be a significant performance bottleneck while at the same time consuming significant power and posing a reliability challenge. With the constraints on bandwidth, power, and energy continuously tightening, adaptivity and heterogeneity can significantly boost overall performance and reduce costs. In this talk I will give an architect's perspective on recent trends, challenges, and opportunities of emerging memory device, packaging, and interface technologies. I will then discuss recent research directions and results that demonstrate how adaptivity offers promising cross-layer solutions.

    Short Bio:
    Mattan Erez is an Associate Professor at the Department of Electrical and Computer Engineering at the University of Texas at Austin. His research focuses on improving the performance, efficiency, and scalability of computing systems through advances in hardware architecture, software systems, and programming models. The vision is to increase the cooperation across system layers and develop flexible and adaptive mechanisms for proportional resource usage. Mattan received a B.Sc. in Electrical Engineering and a B.A. in Physics from the Technion, Israel Institute of Technology and his M.S and Ph.D. in Electrical Engineering from Stanford University. He is a recipient of a 2013 Presidential Early Career Award in Science and Engineering (PECASE), a 2012 Early Career Research Award from the Department of Energy, and a 2010 NSF CAREER Award.

    Note:
    The colloquium is jointly organized by the Department of Computer Science at the University of Cyprus and the Department of Electrical and Computer Engineering at the University of Cyprus.

    Web: http://www.cs.ucy.ac.cy/colloquium/
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    Calendar: http://www.cs.ucy.ac.cy/colloquium/schedule/cs.ucy.2014.erez.ics

    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Real-Time Hand Tracking for Human-Computer Interaction, Dr. Paris Kaimakis (University of Cyprus, Cyprus), Wednesday, December 18, 2013, 10:00-11:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Real-Time Hand Tracking for Human-Computer Interaction

    Speaker: Dr. Paris Kaimakis
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, December 18, 2013
    Time: 10:00-11:00 EET
    Host: Yiorgos Chrysanthou (yiorgos-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.kaimakis

    Abstract:
    The successful commercialisation of Microsoft's Kinect, and the recent release of the Leap Motion Controller have demonstrated the increasing demand for reliable, low-cost, real-time Markerless Motion Capture systems -- systems that can sequentially estimate the subject’s 3Dpose based on visual information, without markers. Such systems have numerous lucrative applications, e.g. in human-computer interaction, computer gaming, animation, automated surveillance, and more. The last decade has seen limited progress in the field, mainly due to the conflicting design criteria of such systems: real-time processing indicates that implementation of gradient-based algorithms is necessary for tracking, while the low-cost criterion disqualifies the use of dedicated hardware and therefore imposes use of low-level and often ambiguous data. The problem is that gradient-based approaches become very unstable in the presence of such ambiguity. In this talk we introduce a system designed to circumvent these difficulties, achieving real-time tracking of the human hand with high precision and zero hardware requirements (further to an ordinary laptop). The talk will focus on the system's early design and modelling steps, as well as its Bayesian formulation.

    Short Bio:
    Dr Paris Kaimakis conducted his doctoral research in the Signal Processing Laboratory at the University of Cambridge focusing on solutions to the Markerless Motion Capture problem. After receiving the PhD degree in 2009, he worked as a Research Associate in the Computer Laboratory, again in the University of Cambridge. His post-doctoral research concentrated on the automation of urban road traffic surveillance and flow-volume estimation using visual means and sequential Monte Carlo methods. In 2010 he joined Autonomy, the UK's largest software firm, as a Research and Development Engineer. While in Autonomy, he worked in the development of augmented reality applications for the iPhone/iPad and for Android devices. He has been involved in the development of the popular Aurasma App, the world's first visual browser (over 3 million users, available at the App Store and Google Play) and worked in related side-projects such as 3D head tracking, image processing and image analysis. In 2011 Paris returned to Cyprus and co-founded a company dedicated to the development and commercialisation of new-generation, human-oriented, controller-free computer interfaces. Paris has also conducted EU-funded research on the automation of visual surveillance on Cypriot sea borders, and has taught computer vision to undergraduates at the University of Cyprus.

    Web: http://www.cs.ucy.ac.cy/colloquium/
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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Virtual Clustering in Cognitive Femtocells, Prof. Laurence S. Dooley (The Open University, United Kingdom), Wednesday, December 4, 2013, 14:00-15:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Virtual Clustering in Cognitive Femtocells

    Speaker: Prof. Laurence S. Dooley
    Affiliation: The Open University, United Kingdom
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, December 4, 2013
    Time: 14:00-15:00 EET
    Host: Andreas Pitsillides (cspitsil-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.dooley

    Abstract:
    Cognitive femtocells are a fertile topic in cognitive radio and dynamic spectrum access research, with femtocell access points (FAP) being proposed as a cheap, plug-and-play solution for extending radio coverage in indoor environments, where conventional macrocell data services can suffer from poor signal quality. Despite their attraction, FAP pose many technical challenges due to uncoordinated user positioning which makes network planning impracticable, so only post-deployment strategies are feasible. A key FAP challenge is interference management and how best to dynamically allocate resources in an effective manner. In a joint macro-femtocell overlay arrangement, inter and intra-tier interference must be efficiently managed to ensure successful operation, with femto-to-femto (F2F) interference being the major issue, particularly in dense FAP scenarios. This talk presents an interference-aware paradigm for femtocells based on the novel concept of virtual clustering. An adaptive, scalable generalised virtual clustering femtocell (GVCF) architecture will be discussed which groups together FAP in logical clusters. With each cluster operating on different bands of frequencies, the corresponding cluster controller has only to manage its own FAP members, so system complexity is low. The GVCF model will be examined from both a resource availability and clustering perspective to minimise both cross-tier and F2F interference and achieve significantly enhanced quality-of-service (QoS) provision, especially at high FAP densities. The talk will also investigate the QoS implications of extending FAP coverage to reduce the number of F2M handovers when users move out of range, even for very short periods.

    Short Bio:
    Laurence S. Dooley received his B.Sc. (Hons), M.Sc. and Ph.D. degrees in Electrical and Electronic Engineering from the University of Wales/Cymru (Swansea) in 1981, 1983 and 1987 respectively. Having held professorial positions in both Australia and Germany, he was appointed in 2007, as Chair of Information and Communication Technologies in the Department of Computing and Communications at The Open University, Milton Keynes, where his main research interests include: next generation multimedia technologies, cognitive radio networks, green wireless communications, multimodal medical imaging, 3-D video inpainting, RGB-D descriptors in multi-sensory robot navigation, MANET and 4G/LTE security and SME technology transfer. He has co-edited one book and published more than 245 scientific peer-reviewed journals, book chapters, monographs and conference articles, with 4 papers being awarded international research prizes, including in June this year, the Best Paper Award at the IEEE Wireless Personal Multimedia Communications Symposium (WPMC'13) at the Global Wireless Summit held in Atlantic City. He also received the IEEE Certificate of Award in 2010 for Promoting International Exchange in recognition of his contributions, over two decades, to the biennial IEEE International Conference on Signal Processing series. He is a Chartered Engineer, Fellow of the British Computer Society, IEEE Senior Member and an Editorial Board member of the IET Image Processing journal as well as proudly, being Vice President of the Crawshays Rugby Union Club.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: (Exascale) Data Movement, Prof. Bruce Jacob (University of Maryland - College Park, USA), Friday, November 29, 2013, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    (Exascale) Data Movement

    Speaker: Prof. Bruce Jacob
    Affiliation: University of Maryland - College Park, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, November 29, 2013
    Time: 11:00-12:00 EET
    Host: Paraskevas Evripidou (skevos-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.jacob

    Abstract:
    In trying to speed up large-scale computations, the problem to solve is that of data movement: moving data around the system costs significant time and energy, and the problem very stubbornly refuses to go away (note that computer designers have been trying to solve the memory problem for over three decades). This talk will discuss several of the recent solutions that our group has helped to develop, including flash-based main memory systems and Micron's Hybrid Memory Cube DRAM. The talk will finish by looking at some of the remaining issues.

    Short Bio:
    Bruce Jacob received the AB degree in mathematics from Harvard University in 1988 and the MS and PhD degrees in CSE from the University of Michigan in Ann Arbor in 1995 and 1997, respectively. He also worked for two successful startup companies: Boston Technology and Priority Call Management; at Priority Call Management he was the initial system architect and chief engineer. He is a Keystone Professor of electrical and computer engineering at the University of Maryland in College Park, and he is currently visiting at the University of Siena, Italy, where he is working on memory issues for manycore systems. He is a recipient of a US National Science Foundation CAREER award for his work on DRAM, and he is the lead author of an absurdly large tome on the topic of memory systems. His research interests include memory systems, operating systems, and designing electric guitars.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Mining Large-scale Information Network Data: Challenges and Applications, Dr. Georgios Pallis (University of Cyprus, Cyprus), Wednesday, October 30, 2013, 10:30-11:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Mining Large-scale Information Network Data: Challenges and Applications

    Speaker: Dr. Georgios Pallis
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, October 30, 2013
    Time: 10:30-11:30 EET
    Host: Pedro Trancoso (pedro-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.pallis

    Abstract:
    Information networks contain objects connected by multiple links and described by different attributes, each of which has a different level of semantic importance. Most real-world applications that handle big data, including social networks, software graphs and vehicular networks can be structured into information networks. Therefore, mining large-scale information networks poses interesting but critical challenges. The talk will particularly focus on presenting novel algorithms that efficiently cluster information networks with heterogeneous attributes. Clustering such networks is challenging since the structural and attribute similarities are two seemingly conflicting objectives and it is not clear how to balance them; in addition, the links and attributes are of different types and interpretations. Experimental results on a diverse collection of real data sets that demonstrate the efficiency and effectiveness of the proposed algorithms will be presented. Next, the talk presents applications in information networks and shows that mining such networks offers potential to address long-standing scientific questions. The influence of social cascades over YouTube video diffusion will be presented. Our analysis highlights how social cascades affect the spread of YouTube videos and consequently the users’ navigation behaviour. In terms of Vehicular ad-hoc Networks (VANETs), the information network consists of vehicles that communicate spontaneously, in an ad-hoc manner over a wireless medium. In this talk, our observations regarding the time-evolving topological characteristics of the VANET communication graph in urban environments will be presented. Finally, the talk will conclude with an outlook to our future research agenda.

    Short Bio:
    George Pallis received his BSc (2001) and Ph.D. (2006) degree in Department of Informatics of Aristotle University of Thessaloniki (Greece). Currently, he is Lecturer at the Computer Science Department, University of Cyprus. His research interests focus on Internet Computing, with emphasis on the following topics: mining of information networks, information dissemination in large-scale network-centric computing systems and infrastructures, software retrieval in Cloud infrastructures and applications over Cloud platforms, performance evaluation and optimization of content distribution systems. Dr. Pallis has published in top journals (e.g., TOIT, TOMACS, TKDE, CACM) and conference proceedings (e.g., CCGrid, MASCOTS) in his area of study and he has co-edited a book on Web data management. He is a member of the editorial board in the IEEE Internet Computing magazine and a member of the IEEE Computer Society Cloud Computing Initiative. Since September 2010, he is the editor of the “View from the Cloud” department in IEEE Internet Computing. In addition, he is participating in the Program and Organization Committee of several major International Conferences (e.g., MASCOTS, ICSOC, CCGrid) and serves as a reviewer for major journals (e.g., TPDS, TKDE). Dr. Pallis is a principal institutional investigator or participant in several research projects funded by European Commission and the Cyprus Research Foundation.

    Note:
    This colloquium is part of the speaker's procedure for evaluation and promotion from Lecturer to Assistant Professor.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Robust Distributed Cooperation: Failures vs. Efficiency, Dr. Chryssis Georgiou (University of Cyprus, Cyprus), Wednesday, September 11, 2013, 10:30-11:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Robust Distributed Cooperation: Failures vs. Efficiency

    Speaker: Dr. Chryssis Georgiou
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, September 11, 2013
    Time: 10:30-11:30 EET
    Host: Andreas Pitsillides (cspitsil-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.georgiou

    Abstract:
    The effectiveness of distributed solutions for a broad range of computation problems, ranging from distributed search to distributed simulation and multi-agent collaboration, depends on our ability to exploit parallelism in a system consisting of multiple processors. In large-scale systems the set of processors available to a computation and their ability to communicate and share information may dynamically change due to failures, jobs reassignment, or becoming unavailable for other reasons. Thus, there is a corresponding need for the development of efficient and dependable algorithms that are able to tolerate perturbations in the computing medium. The talk will first overview earlier work that focused on identifying the trade-offs between efficiency and fault-tolerance in cooperative computing via the abstract problem of having a set of processes to cooperatively perform a collection of independent tasks in the presence of adversity, known as Do-All. Then recent developments will be presented that deal with the more challenging problem of Internet-based task computing, following two directions. The first deals with administrated network-centric computing platforms such as Grids and Clouds, whereas the second on Master-Worker computations such as SETI@home volunteer computing, where the computing elements (workers) are not controlled by an administrator. The talk will then focus on robust dissemination of information. Cooperation in networked systems can only be achieved by having the system processes exchanging information via messages; the more effective the information exchange is, the better coordination and collaboration can be achieved between processes. Recent developments that show how failures impact information dissemination will be presented and conditions that enable efficient algorithmic solutions will be discussed. The talk will conclude with an overview of other research problems under investigation.

    Short Bio:
    Chryssis Georgiou is an Assistant Professor in the Department of Computer Science at the University of Cyprus. He holds a Ph.D. (December 2003) and M.Sc. (May 2002) in Computer Science and Engineering from the University of Connecticut and a B.Sc. (June 1998) in Mathematics from the University of Cyprus. He has worked as a Teaching and Research Assistant at the University of Connecticut, USA (1998-2003) and as a Visiting Lecturer (2004) and a Lecturer (2005-2008) at the University of Cyprus. His research interests span the Theory and Practice of Fault-tolerant Distributed and Parallel Computing with a focus on Algorithms and Complexity. He has published in top journals (e.g., Journal of ACM, Distributed Computing, IEEE TPDS, IEEE TC, SICOMP) and conference proceedings (e.g., PODC, DISC, STOC, SPAA, ICDCS) in his area of study and he has co-authored two books on Robust Distributed Cooperative Computing. He has participated in the Program Committee of top conferences in Distributed Computing (e.g., PODC, DISC, ICDCS) and he was elected (by peer-voting) to serve for two terms (2008-2010, 2010-2012) as a member of the Steering Committee of the International Symposium on Distributed Computing (DISC). Dr. Georgiou was the project coordinator/scientific leader of three research projects funded by the Cyprus Research Promotion Foundation, and a research participant in several projects funded by the European Commission.

    Note:
    This colloquium is part of the speaker's procedure for evaluation and promotion from Assistant Professor to Associate Professor.

    Web: http://www.cs.ucy.ac.cy/colloquium/
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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Upper and Lower Bounds on the Cost of a Mapreduce Computation: A Tradeoff, Prof. Foto Afrati (National Technical Universtity of Athens, Greece), Wednesday, July 24, 2013, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Upper and Lower Bounds on the Cost of a Mapreduce Computation: A Tradeoff

    Speaker: Prof. Foto Afrati
    Affiliation: National Technical Universtity of Athens, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, July 24, 2013
    Time: 11:00-12:00 EET
    Host: Marios Mavronicolas (mavronic-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.afrati

    Abstract:
    As MapReduce/Hadoop grows in importance, we find more exotic applications being written this way. Not every program written for this platform performs as well as we might wish. There are several reasons why a MapReduce program can underperform expectations. One is the need to balance the communication cost of transporting data from the mappers to the reducers against the computation done at the mappers and reducers themselves. A second important issue is selecting the number of rounds of MapReduce. A third issue is that of skew. If wall-clock time is important, then using many different reduce-keys and many compute nodes may minimize the time to finish the job. Yet if the data is uncooperative, and no provision is made to distribute the data evenly, much of the work is done by a single node. In this talk we will focus on the tradeoff between communication cost and the computation cost of the reducers: the finer we partition the work of the reducers so that more parallelism can be extracted, the greater will be the total communication between mappers and reducers. We introduce a model of problems that can be solved in a single round of MapReduce computation, and use it to demonstrate the tradeoff. This model enables a generic recipe for discovering lower bounds on communication cost as a function of the computation cost of the reducers, which is captured as the maximum number of inputs that can be assigned to one reducer. We then use the model to compute lower bounds and present algorithms that meet these bounds for a number of problems described below. Algorithms and lower bounds will be presented for problems such as: Similarity joins, Matrix multiplication, subgraph finding, multiway joins.

    Short Bio:
    Foto Afrati received the BS degree from the Mechanical and Electrical Engineering Department of National Technical University of Athens (NTUA) and the PhD degree from Imperial College of the University of London. She is a professor in the Electrical and Computing Engineering Department of the NTUA, Greece and recently spent her sabbatical leave visiting Google at Mountain View (April 2012-June 2013). Her recent research interests are in the area of big data and specifically query optimization for mapreduce and other similar distributed platforms. She has been the programm committee chair for Conference on Principles of Databases (PODS) 2005 and for International Conference on Database Theory (ICDT) 1997 for which she was the organizing committee chair as well. She has served on the program committee of many conferences on databases and algorithms and she has published over a hundred papers in the areas of databases, algorithms and distributed computing.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Toward Programmable High-Performance Multicores, Prof. Josep Torrellas (University of Illinois, Urbana-Champaign, USA), Monday, July 1, 2013, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Toward Programmable High-Performance Multicores

    Speaker: Prof. Josep Torrellas
    Affiliation: University of Illinois, Urbana-Champaign, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, July 1, 2013
    Time: 11:00-12:00 EET
    Host: Pedro Trancoso (pedro-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.torrellas

    Abstract:
    One of the biggest challenges facing us today is how to design parallel architectures that attain high performance while efficiently supporting a programmable environment. In this talk, I describe novel organizations that will make the next generation of multicores more programmable and higher performance. Specifically, I show how to automatically reuse the upcoming transactional memory hardware for optimized code generation. Next, I describe a prototype of Record&Replay hardware that brings program monitoring for debugging and security to the next level of capability. I also describe a new design of hardware fences that is overhead-free and requires no software support. Finally, if time permits, I will outline architectural support to detect sequential consistency violations transparently.

    Short Bio:
    Josep Torrellas is a Professor of Computer Science and Electrical and Computer Engineering at the University of Illinois at Urbana-Champaign (UIUC). He is a Fellow of IEEE and ACM. He is the Director of the Center for Programmable Extreme-Scale Computing, a center funded by DARPA, DOE, and NSF that focuses on architectures for extreme energy and power efficiency. He also directs the Intel-Illinois Parallelism Center (I2PC), a center created by Intel to advance parallel computing in clients. He has made contributions to parallel computer architecture in the areas of shared-memory multiprocessor organizations, cache hierarchies and coherence protocols, thread-level speculation, and hardware and software reliability. He received a Ph.D. from Stanford University.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Towards A Post-CMOS Processor Architecture: Associative Processing using Coupled Oscillators, Prof. Donald M. Chiarulli (University of Pittsburgh, USA), Monday, June 10, 2013, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Towards A Post-CMOS Processor Architecture: Associative Processing using Coupled Oscillators

    Speaker: Prof. Donald M. Chiarulli
    Affiliation: University of Pittsburgh, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, June 10, 2013
    Time: 11:00-12:00 EET
    Host: Pedro Trancoso (pedro-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.chiarulli

    Abstract:
    I will present our research on the design and performance of a hierarchical associative memory based on phase locking of coupled oscillators used for pattern recognition on facial images. The use of coupled oscillators rather than Boolean logic provides for implementations using emerging nano-technology such as Magnetic Spin Torque Oscillators and Resonant Body Transistor Oscillators that have the potential of lower energy and higher density than CMOS solutions. We model the general behavior of loosely coupled non-linear oscillators to perform pattern matching by phase locking first by using CMOS ring oscillators, and then with a simple analytic formulation. We use this reduced model in a simulation of a hierarchical associative memory for image recognition tasks. This research is part of collaboration with Dr. Steven Levitan of the University of Pittsburgh with contributions from Graduate Students. Chet N. Gnegy, and 
Yan Fang.

    Short Bio:
    Donald M. Chiarulli is a Professor of Computer Science and Computer Engineering at the University of Pittsburgh. Dr. Chiarulli received his BS degree (Physics, 1976) from Louisiana State University, MSc (Computer Science, 1979) from Virginia Polytechnic Institute, and PhD (Computer Science, 1986) from Louisiana State University. Dr. Chiarulli’s research is focused on the impact of emerging technology on computer architecture. He has made significant contributions in photonic and optoelectronic computing systems architecture, signal encoding and interconnection architectures and currently nano-scale electronics and magnetics. Dr Chiarulli’s research has been recognized with Best Paper Awards at the International Conference on Neural Networks (ICNN-98) and the Design Automation Conference (DAC-00). He is also the co-inventor on three patents relating to computing systems and optoelectronics. He has served on the technical program committees of numerous conferences for both research and education issues. Dr. Chiarulli has served on the editorial board of the Journal of Parallel and Distributed Systems and is a member of the IEEE. SPIE, and OSA.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Internet Traffic Classification using Energy Time-Frequency Distributions, Dr. Angelos K. Marnerides (Lancaster University, UK), Wednesday, May 8, 2013, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Internet Traffic Classification using Energy Time-Frequency Distributions

    Speaker: Dr. Angelos K. Marnerides
    Affiliation: Lancaster University, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, May 8, 2013
    Time: 11:00-12:00 EET
    Host: Vasos Vassiliou (vasosv-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.marnerides

    Abstract:
    We present a fundamentally new approach to classify application flows based on the mapping of aggregate transport-layer volume information onto the Time-Frequency (TF) plane. We initially show that the volume persona (i.e. counts of packets and bytes) of traffic flows at the transport layer exhibits highly non-stationary characteristics, hence rendering many typical classification methods inapplicable. By virtue of this constraint, we present a novel application classification method based on the Cohen energy TF distributions for such highly non-stationary signals. We have used the Rényi information to measure the distinct complexity of any given application signal, and to subsequently construct a robust training model for every application protocol within our scheme. The effectiveness of our approach is demonstrated using real backbone and edge link network traces captured in US and Japan. Our results show that for the majority of applications, aggregate volume-based classification can reach up to 96% accuracy, while considering significantly less features in comparison with existing approaches.

    Short Bio:
    Angelos K. Marnerides obtained his M.Sc and PhD in Computer Science from Lancaster University in 2007 and 2011 respectively. He is currently a postdoctoral research associate in the department of Computing & Communications at Lancaster University and an honorary research associate with the department of Electronic and Electrical Engineering at UCL. Prior to that he was a joint postdoctoral research fellow at the Carnegie Mellon University- University of Porto under the CMU-Portugal postdoctoral scheme. His research interests span in the broad domains of network resilience, network security and network management for next generation networks with a particular interest on traffic characterisation and profiling using statistical signal processing, machine learning and information-theoretic approaches. He is a member of the IEEE and ACM.

    Video Online:
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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Participative Crowdsourcing and Effective Learning Games using Mobile Phones, Dr. Iza Marfisi (Swedish Institute of Computer Science, Sweden), Tuesday, April 23, 2013, 10.00-11.00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Participative Crowdsourcing and Effective Learning Games using Mobile Phones

    Speaker: Dr. Iza Marfisi
    Affiliation: Swedish Institute of Computer Science, Sweden
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, April 23, 2013
    Time: 10.00-11.00 EET
    Host: Yiorgos Chrysanthou (yiorgos-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.marfisi

    Abstract:
    In the first part of this talk I will present Opphos, a mobile application that creates artistic light and sound effects in order to reflect and enhance the mood and the vibe of an audience during a concert. This application uses the movements of the spectators, the ambient sounds and the air temperature to generate a crowd-sourced light show that reflects the audience's behaviors during an event. It also generates an extra musical instrument by enhancing and propagating cheers and other sounds coming from the crowd. Opphos uses opportunistic peer to peer networking to spread information among mobile phones in the audience, and it is therefore perfectly functional in environment where a cellular network is not available or insufficient for the crowd. This application can be used for concerts, sports gatherings, conferences or any kind of event with small to large crowds. It is currently in the process of been developed for Android phones and will be tested in a real concert during summer 2013. In the second part of this talk I will present two Projects for Designing Effective Learning Games, which are computer games that are designed for a primary purpose other than pure entertainment and that can be used for teaching. Although they are relevant to many fields of education, their development remains very difficult, expensive and time consuming. My presentation will focus on two authoring environments I worked on during my PhD in France in order to help teachers create their own Learning Games in an efficient way. The first environment, LEGADEE (LEarning GAme Design Environment), is a collaborative authoring environment that helps game designers and teachers design effective Learning Games that incorporate fun and educational aspects. The second project, GenCSG (Generic Case Study Game), allows teachers to create their own simple games built on a succession of case studies.

    Short Bio:
    Iza Marfisi joined SICS and Mobile Life as an ERCIM postdoctoral fellow in December 2012. Her research interests are related to Learning Games and exploring innovative educational techniques such as using mobile and pervasive applications. She also is evolved in several Art projects that use computer science to create new forms of participatory entertainment and culture.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: "Elvis has left the building": Retrieval and Filtering of Events in Social Networking, Dr. Christos Tryfonopoulos (University of Peloponnese, Greece), Monday, April 22, 2013, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    "Elvis has left the building": Retrieval and Filtering of Events in Social Networking

    Speaker: Dr. Christos Tryfonopoulos
    Affiliation: University of Peloponnese, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, April 22, 2013
    Time: 11:00-12:00 EET
    Host: Marios Dikaiakos (mdd-AT-cs.ucy.ac.cy) and Georgios Pallis (gpallis-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.tryfonopoulos

    Abstract:
    Our lives are dominated from events. People participate and document events of their everyday lives and subsequently use online social networking services like Facebook or Instagram to share them with friends and acquaintances. In order to make their content available to their online friends, users click hastly the "I agree to the terms of service" button and hand their content off to the social networking site, which acquires total control over the user data and may utilise it in any profitable way. Additionally, the friends of these users are overwhelmed by an avalanche of posts, tweets, and notifications that inform them about a forgotten classmate that has just arrived at the local grocery store or that he is cooking pasta. Our work focuses on tools and techniques to support effective, user-centered, privacy-aware social content management services that are able to tackle the problems described above. In this talk, we will address two important facets of social content management: search and filtering. In the first part of the talk we will discuss content location and search mechanisms designed for decentralised social networking and will introduce two types of friendship: the social friendship that indicates a direct connection among two users and the semantic friendship that emerges from common user interests and is often ignored in traditional social networks. In the second part of the talk we will address the problem of large-scale event processing and provide tools that allow users to issue subscriptions and receive timely notifications whenever certain events of interest take place.

    Short Bio:
    Christos Tryfonopoulos received his BSc from the Computer Science Department, University of Crete (2000), and his MSc (2002) and PhD (2006) in Computer Engineering from the Department of Electronic & Computer Engineering, Technical University of Crete. In 2006 he joined the Databases and Information Systems Department at Max-Planck Institute for Informatics (MPII) as a post-doctoral researcher under the supervision of Prof. Gerhard Weikum, while in 2007-2008 he was the Coordinator of the P2P and Information Management Research Area at MPII. Christos is currently an Assistant Professor at the Department of Computer Science & Technology, University of Peloponnese and a member of the Software & Database Systems Lab. His research interests include distributed large-scale information retrieval/filtering, social/personal/semantic information management, and digital libraries. He has authored over 35 research papers in the area of data/information management and has served in the program committee of more than 50 international journals, conferences and workshops. More info may be found at: http://www.uop.gr/~trifon/

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Communication enablers in emergency response networking: the HelpNet case, Dr. Panayiotis Kollios (University of Cyprus, Cyprus), Wednesday, March 13, 2013, 14:00-15:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Communication enablers in emergency response networking: the HelpNet case

    Speaker: Dr. Panayiotis Kollios
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, March 13, 2013
    Time: 14:00-15:00 EET
    Host: Andreas Pitsillides (cspitsil-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.kollios

    Abstract:
    It is becoming increasingly apparent that citizens are left helpless in the face of emergencies or disasters until such time as help can arrive from first responders. Even when such emergency response units finally make it to the disaster area, it takes considerable time to plan and execute search-and-rescue operations. Gladly, information and communication technologies are increasingly playing a critical role in alleviating this situation. Unfortunately though current solutions (predominantly designed upon infrastructure-based networks) lack flexibility and robustness needed to withstand outages commonly observed in emergency scenarios. On the other hand, ad-hoc solutions formed by opportunistic networking between casual devices (including handsets, tables, PDAs and the like) promise to deliver a far more effective solution. This presentation advocates for the latter approach, examines necessary design requirements and identifies current system limitations. Subsequently, the HelpNet networking architecture is introduced as a novel approach to address those issues that arise from a plausible ad-hoc emergency response networking paradigm. The presentation concludes with a review of enabling technologies that can be used to build HelpNet.

    Short Bio:
    Panayiotis Kolios is a visiting lecturer within the Department of Computer Science (CS), University of Cyprus (UCY). He is also a member of the Networks Research Laboratory (NETRL) of the CS department at UCY where he conducts basic and applied research on mobile computing. He received his BEng and PhD degrees from King’s College London in 2008 and 2011, respectively. His research interests lie broadly within the areas of wireless networking, Internet routing, multimedia communication and network science. He contributes to a number of technical and professional activities within the IEEE.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: From Human Driving to Social Vehicle Navigation, Prof. Liviu Iftode (Rutgers University, USA), Monday, February 11, 2013, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    From Human Driving to Social Vehicle Navigation

    Speaker: Prof. Liviu Iftode
    Affiliation: Rutgers University, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, February 11, 2013
    Time: 15:00-16:00 EET
    Host: Marios Dikaiakos (mdd-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.iftode

    Abstract:
    The time when the driver had to pay full attention to driving will soon be history. The rapid progress in prototyping autonomous and semi-autonomous driverless vehicles will allow computers to replace human driving either completely or most of the time. This transformative technology is already raising many challenging problems starting from real-time performance, to networking, fault tolerance, human-computer interface, and security, to name just a few. If drivers will not need to drive, what else can they do to improve their journeys on the road? In this talk, I will discuss several ideas and projects that may answer this question. First, I will talk about vehicle social networks (VSNs), a novel class of mobile social networking, which we proposed back in 2008. A VSN connects people driving regularly on the same road at the same time, or towards the same destination, who share similar interests, for instance related to the road and traffic condition. I will present two such VSN applications we developed: RoadSpeak and the social vehicle navigation. My talk will also introduce the idea of individualized route calculation and how this can be achieved through the help of other drivers or by crowdsourcing it in real time as human-computing tasks. Finally, I will conclude the talk with a proposal to equip cars with mobile pollution sensors to collect air quality data in real-time, and present preliminary steps towards this goal.

    Short Bio:
    Liviu Iftode is a professor of Computer Science at Rutgers University, New Jersey, USA. He earned his Ph.D. in Computer Science from Princeton University in 1998. Liviu Iftode’s research interests include operating systems, distributed systems, mobile and vehicular computing and networking, mobile systems security, and, more recently, online social networks.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Image Processing of cDNA Microarrays, Prof. Dimitris Maroulis (University of Athens, Greece), Friday, February 15, 2013, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Image Processing of cDNA Microarrays

    Speaker: Prof. Dimitris Maroulis
    Affiliation: University of Athens, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, February 15, 2013
    Time: 15:00-16:00 EET
    Host: Constantinos Pattichis (pattichi-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2013.maroulis

    Abstract:
    Στο πρώτο μέρος της ομιλίας θα γίνει αναφορά στο ερευνητικό έργο του Εργαστηρίου Συστημάτων Πραγματικού Χρόνου και Ανάλυσης Εικόνας του Τμήματος Πληροφορικής και Τηλεπ/νιών του Πανεπιστημίου Αθηνών (ΕΚΠΑ). Η παρουσίαση θα επικεντρωθεί στην ανάλυση και επεξεργασία ιατρικών και βιολογικών εικόνων, και πιο συγκεκριμένα: 1)σε εικόνες ενδοσκοπίου με στόχο τον εντοπισμό πολυπόδων στο έντερο, 2)σε υπερηχογραφικές εικόνες του θυρεοειδούς αδένα με στόχο τον εντοπισμό και τη διαγράμμιση όζων και 3)σε εικόνες πρωτεομικής με στόχο τον εντοπισμό και την κατάτμηση πρωτεϊνικών κηλίδων. Στο δεύτερο μέρος θα παρουσιαστεί μια πρωτότυπη μέθοδος κατασκευής πλέγματος και κατάτμησης κηλίδων (spot-segmentation) σε εικόνες Μικροσυστοιχειών cDNA. Τα υπάρχοντα λογισμικά-μέθοδοι αδυνατούν να αναλύσουν και να επεξεργαστούν τις εικόνες αυτές αυτόματα και η παρέμβαση του χρήστη είναι απαραίτητη για την επιλογή των καταλληλότερων τιμών των παραμέτρων, αλλά και για τη διόρθωση των αποτελεσμάτων. Συνέπεια αυτού είναι να καθίσταται χρονοβόρα η επεξεργασία τέτοιων εικόνων, αλλά και υποκειμενική, πράγμα που έχει σαν αποτέλεσμα να εξάγονται διαφορετικά βιολογικά συμπεράσματα. Η μέθοδος που θα παρουσιαστεί αντιμετωπίζει την περίπτωση αυτή σαν πρόβλημα βελτιστοποίησης και το επιλύει αυτόματα, χρησιμοποιώντας γενετικούς αλγόριθμους. Ιδιαίτερα για την κατάτμηση των κηλίδων, ορίζεται η μαθηματική εξίσωση ενός μοντέλου 3διάστατης αναπαράστασης των διαφόρων τύπων κηλίδων και ο γενετικός αλγόριθμος που χρησιμοποιείται, καθορίζει τις βέλτιστες τιμές των παραμέτρων για κάθε κηλίδα. Η μέθοδος αυτή εφαρμόστηκε σε συνθετικές και πραγματικές εικόνες που πάρθηκαν από καθιερωμένες στη βιβλιογραφία βάσεις δεδομένων, και η ακρίβεια των αποτελεσμάτων της υπερέχει της αντίστοιχης καθιερωμένων μεθόδων.

    Short Bio:
    Ο Δημήτρης Μαρούλης μετά τις βασικές του σπουδές στο τμήμα Φυσικής του Εθνικού και Καποδιστριακού Πανεπιστημίου Αθηνών, συνέχισε μεταπτυχιακές σπουδές στην Ηλεκτρονική, στη Ραδιοηλεκτρολογία και στον Ηλεκτρονικό Αυτοματισμό, ενώ έλαβε το Διδακτορικό του τίτλο στην Επιστήμη των Υπολογιστών. Εργάστηκε ως ερευνητής για 3 χρόνια στο Τμήμα Διαστημικών Ερευνών (DESPA) του Αστεροσκοπείου της Meudon στο Παρίσι και στη συνέχεια συνεργάστηκε για πάνω από 10 χρόνια με το ίδιο Τμήμα. Για περίπου 20 χρόνια υπηρέτησε ως λέκτορας, επίκουρος και αναπληρωτής καθηγητής στα Τμήματα Φυσικής και Πληροφορικής του Πανεπιστημίου Αθηνών. Σήμερα, είναι Καθηγητής στο Τμήμα Πληροφορικής και Τηλεπικοινωνιών του Πανεπιστημίου Αθηνών και επικεφαλής του Εργαστηρίου Συστημάτων Πραγματικού Χρόνου και Ανάλυση Εικόνας (RTS-Image). Έχει πάνω από 20 χρόνια εμπειρίας στον τομέα των συστημάτων πραγματικού χρόνου και συλλογής δεδομένων, και περισσότερα από 15 χρόνια εμπειρίας στον τομέα της ανάλυσης και επεξεργασίας εικόνας και σήματος. Στο διάστημα αυτό συνεργάστηκε με πολλά ελληνικά και ευρωπαϊκά νοσοκομεία και κέντρα υγείας στον τομέα της Ιατρικής Πληροφορικής και της Βιοπληροφορικής. Έχει συμμετάσχει σαν υπεύθυνος έργου ή σαν κύριος ερευνητής σε περισσότερα από 12 ευρωπαϊκά και εθνικά έργα έρευνας και ανάπτυξης (R&D) και έχει δημοσιεύσει περισσότερες από 150 ερευνητικές εργασίες σε διεθνή περιοδικά και συνέδρια, ενώ υπάρχουν περισσότερες από 1000 ετεροαναφορές στο δημοσιευμένο έργο του. Τα ερευνητικά του ενδιαφέροντα περιλαμβάνουν συστήματα πραγματικού χρόνου και συλλογής δεδομένων, καθώς και ανάλυση και επεξεργασία σήματος και εικόνας με εφαρμογές στη βιοπληροφορική και στα βιοϊατρικά συστήματα.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Network Search from a Game Theoretic Perspective, Prof. Steve Alpern (University of Warwick, UK), Friday, December 14, 2012, 13.30-14.30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Network Search from a Game Theoretic Perspective

    Speaker: Prof. Steve Alpern
    Affiliation: University of Warwick, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, December 14, 2012
    Time: 13.30-14.30 EET
    Host: Andreas Pitsillides (cspitsil-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.alpern

    Abstract:
    An object (hider) is at an unknown point on a given network Q, not necessarily at a node. Starting from a known point (known to the hider), a searcher moves around the network to minimize the time T required to find (reach) the hider. The hider's location may be a known distribution or one chosen by the hider to make T large. We study the Bayesian problem where the hider's distribution over Q is known and also the game problem where it is chosen by an adversarial hider. Two types of searcher motion (continuous search or expanding search) are considered.

    Short Bio:
    Steve Alpern first studied game theory under Oskar Morgenstern at Princeton and became interested in Search Games through contact with Rufus Isaacs. After many years at the London School of Economics he is now in the Operational Research Group at the University of Warwick.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Energy-Efficient Computing, Prof. Antonio González (Intel Labs Research & Univ. Politècnica de Catalunya, Spain), Friday, December 7, 2012, 16.00-17.00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Energy-Efficient Computing

    Speaker: Prof. Antonio González
    Affiliation: Intel Labs Research & Univ. Politècnica de Catalunya, Spain
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, December 7, 2012
    Time: 16.00-17.00 EET
    Host: Pedro Trancoso (pedro-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.gonzález

    Abstract:
    Moore’s law will continue to provide us with the capability to integrate more devices in the same area, but the benefit of this ever increasing computing density is jeopardized by the difficulties to dissipate the increased power it requires. On the other hand, smaller devices will be more susceptible to faults and will exhibit an increasing degree of variability in their behavior. In this scenario, innovative solutions to reduce power through more resilient architectures are going to be key to harness the benefits of Moore’s law in order to keep delivering an increased performance to the end user. In this talk I will outline some research avenues based on this approach and will also present an overview of other activities in Intel Labs Barcelona.

    Short Bio:
    Antonio González received his M.S. and Ph.D. degrees from the Universitat Politècnica de Catalunya (UPC), in Barcelona, Spain. He is the founding director of the Intel Barcelona Research Center, started in 2002, whose research focuses on new microarchitecture paradigms and code generation techniques for future microprocessors. He has been a faculty member of the Computer Architecture Department of UPC since 1986 and became Full Professor in 2002. He has published over 300 papers, has given over 80 invited talks, has filed over 40 patents and has advised 20 PhD thesis in the areas of computer architecture and compilers. He has served as an Associate Editor of the IEEE Transactions on Computers, IEEE Transactions on Parallel and Distributed Systems, ACM Transactions on Architecture and Code Optimization, IEEE Computer Architecture Letters and Journal of Embedded Computing. He has served on the program committees for over 100 international symposia in the field of computer architecture, including ISCA, MICRO, HPCA, ASPLOS, PACT, ICS, ISPASS, CASES and IPDPS. He has been program chair for ICS 2003, ISPASS 2003, MICRO 2004, HPCA 2008 and ISCA 2011, and general chair for MICRO 2008 among other symposia. González’s awards include the award to the best student in computer engineering in Spain graduating in 1986, the 2001 Rosina Ribalta award as the advisor of the best PhD project in Information Technology and Communications, the 2008 Duran Farrell award for research in technology, and the 2009 Aritmel National Award of Informatics to the Computer Engineer of the Year.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: The Web: Wisdom of Crowds and a Long Tail, Prof. Ricardo Baeza-Yates (Yahoo! Research Labs, Spain), Wednesday, November 28, 2012, 15.00-16.00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    The Web: Wisdom of Crowds and a Long Tail

    Speaker: Prof. Ricardo Baeza-Yates
    Affiliation: Yahoo! Research Labs, Spain
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, November 28, 2012
    Time: 15.00-16.00 EET
    Host: Marios D. Dikaiakos (mdd-AT-cs.ucy.ac.cy) and George Pallis (gpallis-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.baeza-yates

    Abstract:
    The Web continues to grow and evolve very fast, changing our daily lives. This activity represents the collaborative work of the millions of institutions and people that contribute content to the Web as well as more than one billion people that use it. In this ocean of hyperlinked data there is explicit and implicit information and knowledge. But how is the Web? Web data mining is the main task to answer this question. Web data comes in three main flavors: content (text, images, etc.), structure (hyperlinks) and usage (navigation, queries, etc.), implying different techniques such as text, graph or log mining. Each case reflects the wisdom of some group of people that can be used to make the Web better. For example, user generated tags in Web 2.0 sites. One important phenomenon of this wisdom is the long tail of the special interests of people. In this talk we cover all these concepts and give specific examples.

    Short Bio:
    Ricardo Baeza-Yates is VP of Yahoo! Research for Europe, Middle East and Latin America, leading the labs at Barcelona, Spain and Santiago, Chile, as well as supervising the newer lab in Haifa, Israel. Until 2005 he was the director of the Center for Web Research at the Department of Computer Science of the Engineering School of the University of Chile; and ICREA Professor at the Department of Technology of the University Pompeu Fabra in Barcelona, Spain. He is co-author of the best-seller book Modern Information Retrieval, published in 1999 by Addison-Wesley with a second edition in 2011, as well as co-author of the 2nd edition of the Handbook of Algorithms and Data Structures, Addison-Wesley, 1991; and co-editor of Information Retrieval: Algorithms and Data Structures, Prentice-Hall, 1992, among more than 200 other publications. He has received the Organization of American States award for young researchers in exact sciences (1993) and several national awards in Chile. In 2003 he was the first computer scientist to be elected to the Chilean Academy of Sciences. During 2007 he was awarded the Graham Medal for innovation in computing, given by the University of Waterloo to distinguished ex-alumni. In 2009 he was awarded the Latin American distinction for contributions to CS in the region and became an ACM Fellow, followed in 2011 by an IEEE Fellowship.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Internet Technologies (systems, tools, media) and Applications to Medical Education, Dr. Panayiotis Bamidis (Aristotle University, Greece), Wednesday, November 14, 2012, 18.00-19.00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Internet Technologies (systems, tools, media) and Applications to Medical Education

    Speaker: Dr. Panayiotis Bamidis
    Affiliation: Aristotle University, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, November 14, 2012
    Time: 18.00-19.00 EET
    Host: Christos Schizas (schizas-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.bamidis

    Abstract:
    Οι σύγχρονες αλλαγές και εξελίξεις των τεχνολογιών του παγκόσμιο ιστού διαμορφώνουν νέα πλαίσια συνεργασίας και εννοιολογικής/σημασιολογικής προσέγγισης του ιστού. Στη διάλεξη αυτή θα γίνει μια διαδρομή στις τεχνολογίες αυτές από δύο πλευρές: την πλευρά του συνεργατικού/κοινωνικού ιστού/διαδικτύου (Web2.0) και την πλευρά του σημασιολογικού ιστού (Web3.0). Στην πρώτη θα γίνει εκτενής αναφορά σε τεχνολογίες που προάγουν τα κοινωνικά πολυμέσα με χρήση εύκολων διαδραστικών εργαλείων όπως ιστολόγια, φόρουμ συζήτησης, συνεργατικές εγκυκλοπαίδειες κτλ, ενώ στη δεύτερη, η έμφαση δίνεται στα διασυνδεδεμένα δεδομένα (linked data) που πρόσφατα φέρονται ως η νέα λύση στο πρόβλημα της αναζήτησης και της σύνδεσης των δεδομένων του παγκόσμιου ιστού μέσα από τη δομημένη περιγραφή τους. Επίκεντρο της προσέγγισης θα είναι η εφαρμογή αυτών των τεχνολογιών στη διαμόρφωση ενός νέου πλαισίου λειτουργίας και πραγμάτωσης της ιατρικής εκπαίδευσης (αλλά και της υγείας γενικότερα). Θα δοθούν και θα συζητηθούν σύγχρονα παραδείγματα εφαρμογών τόσο ως προς την αναζήτηση και εύρεση των ψηφιακών εκπαιδευτικών αντικειμένων/πόρων, όσο και σύγχρονων μορφών πολυμεσικού υλικού που αλλάζουν τον τρόπο διδασκαλίας και διευκολύνουν αφάνταστα την προσέγγιση με βάση το πρόβλημα, που τόσο έχει φανεί να ικανοποιεί τις σύγχρονες εκπαιδευτικές ανάγκες του χώρου της υγείας. Θα εξεταστούν τέλος και πρότυπα ψηφιακής ιατρικής εκπαίδευσης που υλοποιούν τους παραπάνω στόχους.

    Short Bio:
    Ο Παναγιώτης Δ. Μπαμίδης, είναι Επίκ. Καθηγητής στο Εργαστήριο Ιατρικής Πληροφορικής της Ιατρικής Σχολής του Α.Π.Θ. και μέλος του Γραφείου Ιατρικής Εκπαίδευσης της Ιατρικής. Έχει διεξάγει έρευνα στο Weizmann Institute of Science (Ισραήλ), Research Centre Juelich (Γερμανία), University of Newcastle, University of Sheffield και Ανοικτό Πανεπιστήμιο (Αγγλία), ενώ έχει διδάξει σε διάφορα Πανεπιστήμια στην Ελλάδα τόσο σε προπτυχιακό όσο και σε μεταπτυχιακό επίπεδο. Έχει την επιστημονική ευθύνη πλέον των 20 ερευνητικών προγραμμάτων, το συντονισμό 2 εξ αυτών σε πανευρωπαϊκό επίπεδο, ενώ έχει λάβει μέρος σε διάφορα άλλα ερευνητικά προγράμματα τόσο Εθνικά όσο και Ευρωπαϊκά. Διετέλεσε πρόεδρος των Διεθνών Συνεδρίων MEI2012, SAN2011, MEDICON2010, 6th GASMA/IAA 2010, iSHIMR2005, iSHIMR2001, ενώ έχει διοργανώσει μια σειρά ημερίδων στα πλαίσια διεθνών συνεδρίων και προγραμμάτων. Τα ερευνητικά του ενδιαφέροντα βρίσκονται στην ιατρική πληροφορική και ειδικότερα τις εφαρμογές της στην ιατρική εκπαίδευση, στη διαχείριση της ιατρικής πληροφορίας και την οργάνωση/διασύνδεση των υπηρεσιών υγείας, στη διασύνδεση ανθρώπου-μηχανής και τη μελέτη του συναισθήματος μέσα από την εφαρμοσμένη νευροεπιστήμη, στην υποστήριξη και εκπαίδευση ατόμων/ομάδων με ειδικές ανάγκες, όπως και στην ανάλυση βιο-σημάτων και ανάπτυξη βιο-αισθητήρων. Έχει δημοσιεύσει πάνω από 130 εργασίες σε περιοδικά και πρακτικά συνεδρίων, ενώ είναι κριτής σε 20 περιοδικά και διετέλεσε χρέη Guest Editor σε 11 ειδικές εκδόσεις (special issues) μερικών από αυτά. Είναι τέλος μέλος διαφόρων επιστημονικών επιτροπών και αναπληρωματικό μέλος του ΔΣ της Αλεξάνδρειας Ζώνης Καινοτομίας της Θεσσαλονίκης. Το Νοέμβριο του 2009 τιμήθηκε με το Βραβείο Αριστείας του Α.Π.Θ, για την ερευνητική του δραστηριότητα ως μέλος ΔΕΠ-νέος ερευνητής σε χρηματοδοτούμενα έργα.

    Note:
    1) The talk will be in Greek. 2) The presenter will also provide the following talk: Friday, November 16, 18:00-19:00: "Ψηφιακή Ιατρική Εκπαίδευση: χθες, σήμερα, αύριο".

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Data Science – the Case of Mobility Data, Dr. Yannis Theodoridis (University of Piraeus, Greece), Monday, November 12, 2012, 14:00-15:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Data Science – the Case of Mobility Data

    Speaker: Dr. Yannis Theodoridis
    Affiliation: University of Piraeus, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, November 12, 2012
    Time: 14:00-15:00 EET
    Host: Demetris Zeinalipour (dzeina-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.theodoridis

    Abstract:
    From raw location recordings to mobility patterns; how can we exploit on the ubiquitous GPS technology (that is found everywhere; from vehicles and vessels to smartphones) in order to get knowledge about our movement behavior? What are the most representative examples of mobility patterns that can be found in mobility datasets? How can we address the big volumes of mobility data? In this talk we overview issues and solutions on data science, focusing on the mobility data case.

    Short Bio:
    Yannis Theodoridis is Assoc. Professor at the Department of Informatics, University of Piraeus, where he currently leads the Information Management Lab. Born in 1967, he received his Diploma (1990) and Ph.D. (1996) in Electrical and Computer Engineering, both from the National Technical University of Athens, Greece. Before joining the University of Piraeus, he was member of the research staff at the Hellenic Research Foundation (1997-98) and the Computer Technology Inst. (1999-2002). His research interests include Data Science (management, analysis, mining) for mobility data, whereas he teaches databases, data mining and GIS at under- and post- graduate level. Apart from several national-level projects, he is or was scientist in charge and coordinator of two European projects, namely PANDA (FP6/IST, 2001-04) and CODMINE (FP6/IST, 2002-03), and principal investigator in GeoPKDD (FP6/IST, 2005-09), MODAP (FP7/ICT, 2009-12; member of the management board), MOVE (COST, 2009-13; vice-chair of the management committee), DATASIM (FP7/ICT, 2011-14) and SEEK (FP7/PEOPLE, 2012-15). He has served as general co-chair for SSTD'03, ECML/PKDD'11 and PCI'12, vice PC chair for IEEE ICDM'08, organizing chair for the 2010 summer school on “Mobility, Data Mining, and Privacy”, member of the editorial board of the Int'l Journal on Data Warehousing and Mining – IJDWM (2005-), and member of the SSTD endowment (2010-). He has offered several tutorials in top conferences (with the most recent being at EDBT’09) and invited lectures in Greece and abroad (including PhD/MSc courses at Venice, Milano, KAUST, Aalborg, Trento and Ghent) on the topic of Mobility Data Management and Exploration. He has co-authored three monographs and more than 100 refereed articles in scientific journals and conferences, receiving more than 800 citations. For more information: http://www.unipi.gr/faculty/ytheod and http://infolab.cs.unipi.gr.

    Note:
    Additional Talks by Dr. Theodoridis: Schedule (http://www.cs.ucy.ac.cy/colloquium/lectures/theodoridis12.pdf): [ Lecture 1: Mobility Data Management, Date: Monday, Nov. 12, 2012, Time: 16:30 – 18:00 | Lecture 2: Mobility Data Exploration, Date: Thursday, Nov. 15, 2012, Time: 13:30 – 15:00 | Lecture 3: Mobility Data Privacy, Date: Thursday, Nov. 15, 2012 Time: 15:00 – 16:30 ] Slides: [ http://www.cs.ucy.ac.cy/colloquium/lectures/theodoridis12-slides/00.pdf | http://www.cs.ucy.ac.cy/colloquium/lectures/theodoridis12-slides/01.pdf | http://www.cs.ucy.ac.cy/colloquium/lectures/theodoridis12-slides/02.pdf | http://www.cs.ucy.ac.cy/colloquium/lectures/theodoridis12-slides/03.pdf ]

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Ideas Worth Spreading in Information Security & Cryptography, Dr. Nikos Komninos (University of Cyprus, Cyprus), Tuesday, October 30, 2012, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Ideas Worth Spreading in Information Security & Cryptography

    Speaker: Dr. Nikos Komninos
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, October 30, 2012
    Time: 15:00-16:00 EET
    Host: Vasos Vassiliou (vasosv-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.komninos

    Abstract:
    The protection of information in hostile environments is a crucial factor in the growth of industry, business, and administration processes. Cryptography is the key technology for achieving information security in computer systems, communications, and, more generally, in the emerging information society. In this talk, we will lay out today's security problems and give some indications and warnings of tomorrow's security challenges. In particular, we will examine the security technologies, systems and applications of academic/industry interest and present fundamental problems in the information security and cryptography era.

    Short Bio:
    Dr. Nikos Komninos (PhD, University of Lancaster, 2003) is currently a Visiting Assistant Professor in the University of Cyprus at the Department of Computer Science. Prior to his current post, he has held teaching and research positions in the University of Lancaster, the University of Piraeus, the University of Aegean, and Carnegie Mellon University (Athens Information Technology). Between 2003 and 2007, he was honorary research fellow with the Department of Communication Systems at the University of Lancaster. He was also a faculty member at Carnegie Mellon University (Athens Information Technology), between 2005 and 2011. Part of his research has been patented and used in mobile phones (by Motorrola), in crypto-devices (by Defense companies) and in applications (by NHS). Since 2000, he has participated in more than 30 European and national R&D projects, as a researcher, scientific director or program manager, in the area of information security and cryptography. He has authored or co-authored more than 50 journal publications, book chapters and conference proceedings publications in his areas of interest. He has been invited to give talks in conferences and Governmental Departments, as well as to train employees in Greece and UK businesses.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: A Secure Data Aggregation based Trust Management Approach for Dealing with Untrustworthy Motes in Sensor Network, Prof. Sanjay K. Madria (Missouri University of Science and Technology, Rolla, MO, USA), Thursday, October 25, 2012, 14.00-15.00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    A Secure Data Aggregation based Trust Management Approach for Dealing with Untrustworthy Motes in Sensor Network

    Speaker: Prof. Sanjay K. Madria
    Affiliation: Missouri University of Science and Technology, Rolla, MO, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, October 25, 2012
    Time: 14.00-15.00 EET
    Host: Andreas Pitsillides (cspitsil-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.madria

    Abstract:
    Efficient power management is vital for increasing the life of wireless sensor networks (WSN). The main reason is that the radio transmission consumes energy approximately three times comparing to other operations. Thus, techniques such as data aggregation have been widely used in WSN to preserve energy. Despite its appealing and powerful features, data aggregation requires a high level of security as tampering with aggregating data can be suspected due to small bit errors. We propose a comprehensive trust management approach to deal with the potential dishonest and faulty motes in sensor networks. Unlike other trust management approaches, we take into account multiple properties in leveraging between positive trust and behavior uncertainty so as to yield the projection of trust which represents truster’s confidence in the trustee node to have the capability to complete the task. We comprehensively evaluate and compare trust management schemes in the sensing environment using TOSSim simulator. The results have shown that the proposed scheme is memory efficient and provides fairly accurate results allowing sensors to appropriately adjust themselves and manage to carry out their missions during normal and extreme environment.

    Short Bio:
    Sanjay Kumar Madria received his Ph.D. in Computer Science from Indian Institute of Technology, Delhi, India in 1995. He is a full professor in the Department of Computer Science at the Missouri University of Science and Technology (formerly, University of Missouri-Rolla, USA) and site director, NSF I/UCRC center on Net-Centric Software Systems. He has published more than 180 Journal and conference papers in the areas of mobile data management, XML & Web Warehousing and Sensor computing. He won two three best papers awards including IEEE MDM 2011 and 2012. He is the co-author of a book in the area of web warehousing published by Springer in Nov 2003. He has organized International conferences as general co-chair (MDM, SRDS and others), workshops and presented tutorials in the areas of mobile data management and web data mangement. His research is supported by NSF, DOE, AFRL, ARL, Boeing and others. He has also been awarded JSPS (Japanese Society for Promotion of Science) visiting scientist fellowship in 2006 and ASEE (American Society of Engineering Education) fellowship at AFRL from 2008 to 2012. He received faculty excellence and research awards in 2007, 2009 and 2011 from his university for excellence in research, teaching and service. He is IEEE and ACM Distinguished Speaker, and IEEE Senior Member.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Low Intensity Pulsed Ultrasound in the Enhancement and Remote Monitoring of Fracture Healing, Prof. Konstantinos N. Malizos (University of Thessalia, Greece), Wednesday, October 24, 2012, 19.30-21:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Low Intensity Pulsed Ultrasound in the Enhancement and Remote Monitoring of Fracture Healing

    Speaker: Prof. Konstantinos N. Malizos
    Affiliation: University of Thessalia, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, October 24, 2012
    Time: 19.30-21:00 EET
    Host: Christos Schizas (schizas-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.malizos

    Abstract:
    Low-intensity ultrasound is a biophysical form of intervention in the fracture-repair process, which through several mechanisms accelerates healing of fresh fractures and enhances callus formation in delayed unions and nonunions. The goal of this review is to present the current knowledge obtained from basic science and animal studies, as well as existing evidence from clinical trials and case series with the different applications of ultrasound in the management of fractures, delayed unions, nonunions and distraction osteogenesis. Low-intensity pulsed ultrasound is currently applied transcutaneously, although recent experimental studies have proven the efficacy of a trans-osseous application for both enhancement and monitoring of the bone healing process with modern smart implant technologies.

    Short Bio:
    Konstantinos N. Malizos is Professor and Chairman of the Orthopaedic Department of the Medical school of the University of Thessalia since 1998. Graduate of the University of Thessaloniki, Resident of University of Ioannina and post-residency training in Strasbourgh Hand Center “SOS Main” and Duke University Medical Center. Dean of Med School of University of Thessalia 2007-11, President of European Bone and Joint Infection Society 2005-2007. Member of 19 International Societies. President of Hellenic Association of Orthopaedic and Trauma Society 2012. Founding Director of Institute of Biomedical Research and Technology (CERETETH) 2006-2011. 200 International Publications (h index 26). Books: Malizos, KN (ed), Reconstructive Microsurgery: Landes Bioscience, 2003 and Malizos KN, Soucacos PN (eds), Infections of the Hand and Upper Limb.: Paschalidis (Elsevier), 2007. 26 Grants from the EU and the USA, Patents: two (2) international EU., USA. For more information, please visit www.ortho-uth.org

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Why you can't hurry love: an explanation using game theory, Dr. Peter D. Sozou (LSE, University of London, UK), Tuesday, October 16, 2012, 16:30-17:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Why you can't hurry love: an explanation using game theory

    Speaker: Dr. Peter D. Sozou
    Affiliation: LSE, University of London, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, October 16, 2012
    Time: 16:30-17:30 EET
    Host: Chris Christodoulou (cchrist-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.sozou

    Abstract:
    This talk is concerned with signalling in courtship. The underlying principle is that, in choosing whether to mate with a given male, a female is uncertain about some variable such as the male's genetic quality, or his ability or willingness as a provider. In simple terms, the male (from the female's point of view) is "good" or "bad", but she cannot tell which from his appearance alone. I will present a game theory model of courtship as a process in continuous time, showing that the duration of a male's courtship effort can act as an indicator of his type: a good male will tend to signal for longer than a bad male, so by delaying mating a female is able to screen out bad males. This is an example of costly signaling theory, an important concept in economics and evolutionary biology. (The talk presents a joint work with Robert M Seymour, UCL). Further reading: Seymour, R M & Sozou, P D (2009). Duration of courtship effort as a costly signal. Journal of Theoretical Biology 256, 1-13.

    Short Bio:
    Dr Peter Sozou is a Research Associate in the Centre for Philosophy of Natural and Social Science at LSE. Much of his research has been concerned with mathematical modelling, decision-making and the use of information. His main current interests are in theoretical biology, behaviour and economic theory (including discounting the future, self-control, ageing and signalling); and medical decision-making (particularly in reproductive medicine). He has also worked on problems in optics and computer vision, and has been an occasional columnist for the Times. For further information, please visit: http://personal.lse.ac.uk/sozou/

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Querying Sensor Data in Smartphone Networks, Dr. Demetris Zeinalipour (University of Cyprus, Cyprus), Thursday, October 11, 2012, 09.15-10.15 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Querying Sensor Data in Smartphone Networks

    Speaker: Dr. Demetris Zeinalipour
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, October 11, 2012
    Time: 09.15-10.15 EET
    Host: Andreas Pitsillides (cspitsil-AT-cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.zeinalipour

    Abstract:
    Smartphones have emerged as powerful computational platforms equipped with multitude of sensors that are capable of generating vast amounts of data (geo-location, audio, video, etc.) Collections of smartphones connected to the Internet are nowadays proposed for opportunistic and participatory sensing applications in intelligent transportation systems, social networking applications, city planning and many other domains, prompting undeniably the post-PC era. In this talk, I will present distributed architectures for querying and managing such sensor data by taking into account energy, data disclosure and networking aspects. I will particularly focus on SmartTrace, a powerful query processing framework for finding similar smartphone trajectories without disclosing the traces of participating users. I will also present SmartLab, a first-of-a-kind programmable cloud of 40+ smartphones deployed at our department enabling a new line of systems-oriented research on smartphones. Finally, I will also overview other related smartphone data management frameworks we've developed for peer-to-peer search, crowdsourcing and indoor positioning, concluding with an outlook to our future research agenda.

    Short Bio:
    Demetris Zeinalipour (PhD, University of California, Riverside, 2005) is a Lecturer of Computer Science at the University of Cyprus. Before that he was a Lecturer at the Open University of Cyprus, a Visiting Lecturer at his current department and a Visiting Researcher at the network intelligence lab of Akamai Technologies (MA, USA). Demetris has served as the PC Co-Chair of ACM MobiDE'09, IEEE MDM'10 and VLDB's DMSN'10, the General Chair for ACM MobiDE'10, the Contest Chair of IEEE ICDM'10 and the Organization Chair of HDMS'10. His primary research interests include Data Management in Systems and Networks, in particular Distributed Query Processing, Storage and Retrieval Methods for Sensor, Smartphone and Peer-to-Peer Systems, Mobile and Network Data Management, Energy-aware Data Management. For more information, please visit: http://www.cs.ucy.ac.cy/~dzeina/

    Note:
    This colloquium is part of the speaker's procedure for evaluation and promotion from Lecturer to Assistant Professor.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Fuzzy Cognitive Maps for Decision Support, Dr. Elpiniki I. Papageorgiou (TEI Lamias, Greece), Friday, May 25, 2012, 15.30-16:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Fuzzy Cognitive Maps for Decision Support

    Speaker: Dr. Elpiniki I. Papageorgiou
    Affiliation: TEI Lamias, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, May 25, 2012
    Time: 15.30-16:30 EET
    Host: Christos N. Schizas (schizas AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.papageorgiou

    Abstract:
    Fuzzy cognitive maps (FCMs), introduced by Bart Kosko in 1986, are nonlinear feedback dynamical systems for modeling causal knowledge. They combine aspects of fuzzy logic, neural networks, semantic networks, expert systems, and nonlinear dynamical systems. That rich structure endows FCMs with their own complexity and lets them apply to a wide range of problems in engineering and in applied sciences. They gained momentum due to their dynamic characteristics and learning capabilities. These capabilities make them essential for modeling, analysis and decision making tasks as they improve the performance of these tasks. In addition, several FCM extensions have been proposed during the last decade. Each one of them improves the conventional FCM, as initially suggested by Kosko (1986), in different ways. For nearly a quarterly of a century extensive research in the theory of FCMs has been performed that provided major improvements and enhancements in its theoretical underpinning. New methodologies and approaches have been explored for decision support. A thorough presentation on the fundamentals and theories of FCMs for decision making and support tasks will be accomplished. Some specific examples of how these FCM theories have been applied for decision support in specific application areas, such as in medicine, agriculture, environment and engineering, will be presented. Some recent trends on FCMs will be discussed.

    Short Bio:
    Dr. Elpiniki I. Papageorgiou is Lecturer at the Dept. of Informatics and Computer Technology of the Technological Education Institute (TEI) of Lamia, Greece. She received her B.Sc. degree in Physics in 1997 from the University of Patras, Greece, with honor. In July 2000, she received her M.Sc. degree in Medical Physics with honors from the same University and in September 2004 her Ph.D. degree in Computer Science from the Dept. of Electrical and Computer Engineering, from the University of Patras. She is working mainly in the area of modeling, learning and decision support, using the soft computing methodology of Fuzzy Cognitive Maps (FCMs). She has been actively involved in several research projects, funded from national and international organizations, including the European Union and the Greek Research Foundation.

    Note:
    Dr. Elpiniki I. Papageorgiou is Lecturer at the Dept. of Informatics and Computer Technology of the Technological Education Institute (TEI) of Lamia, Greece. She received her B.Sc. degree in Physics in 1997 from the University of Patras, Greece, with honor. In July 2000, she received her M.Sc. degree in Medical Physics with honors from the same University and in September 2004 her Ph.D. degree in Computer Science from the Dept. of Electrical and Computer Engineering, from the University of Patras. She is working mainly in the area of modeling, learning and decision support, using the soft computing methodology of Fuzzy Cognitive Maps (FCMs). She has been actively involved in several research projects, funded from national and international organizations, including the European Union and the Greek Research Foundation.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Brain-inspired computing for machine vision, Prof. Nicolai Petkov (University of Groningen, Netherlands), Wednesday, May 23, 2012, 11.00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Brain-inspired computing for machine vision

    Speaker: Prof. Nicolai Petkov
    Affiliation: University of Groningen, Netherlands
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, May 23, 2012
    Time: 11.00-12:00 EET
    Host: Christos N. Schizas (schizas AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.petkov

    Abstract:
    Background: Insights into the function of the visual system of the brain can provide clues for solving computer vision tasks. For instance, the popular Gabor filter was inspired by the function of orientation-selective neurons in areas V1 and V2 of visual cortex. Information about the function of further cortical areas, such as V4 and TEO, has not been sufficiently used yet in computer vision. Methods: We propose a novel keypoint detector that is inspired by the properties of shape-selective neurons in area V4 of visual cortex. It is trainable as it is configured by the automatic analysis of a feature specified by a user. We configure a set of detectors that are selective for vascular bifurcations in retinal fundus images and demonstrate how such filters can be used to detect similar features. The automatic configuration of such an operator selects given channels of a bank of Gabor filters and the response of the proposed filter is computed as the product of their responses at specific locations. The proposed operator can be implemented easily using convolutions, shifting, blurring and pixel-wise function evaluation. We refer to it as COSFIRE - Combination of Shifted Filter Responses. Results: With the proposed operators, we achieve a recall rate of 98.52% and a precision rate of 95.19% on a set of 40 binary fundus images from the DRIVE data set containing more than 5000 bifurcations and cross-overs. The SIFT approach achieves a recall rate of 82.04% and a precision rate of 51.87%. We applied the proposed operators to the recognition of handwritten digits and achieved results (of 99.45% correct recognition) near the best ever achieved results on the complete MNIST dataset. We also use the proposed operator for traffic sign recognition and achieve recognition rate of 100%. Conclusions: The proposed filters are effective in the detection of vascular bifurcations in retinal fundus images and in the recognition of handwritten digits . They are versatile keypoint detectors as they can be configured with any given local contour pattern and are subsequently able to detect the same and similar patterns.

    Short Bio:
    Nicolai Petkov is professor of computer science at the University of Groningen since 1991. In the period 1998-2009 he was scientific director of the Institute for Mathematics and Computer Science. He works in the field of brain-inspired visual pattern recognition.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: On the Roots of Wireless Communications, Prof. Andreas Antoniou (University of Victoria, Canada), Friday, May 11, 2012, 15.00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    On the Roots of Wireless Communications

    Speaker: Prof. Andreas Antoniou
    Affiliation: University of Victoria, Canada
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, May 11, 2012
    Time: 15.00-16:00 EET
    Host: Costas Pattichis (pattichi AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.antoniou

    Abstract:
    Soon after the discovery and characterization of electromagnetic fields by Faraday and Thomson, the prediction by Maxwell that changing electrical fields will produce electromagnetic waves and, the experimental verification of their existence by Hertz, four enterprising innovators, namely, Tesla, Marconi, Fessenden, and De Forrest, and many others, designed the first generation of wireless communication systems. This presentation deals with some of the highlights of the key discoveries and inventions as well as the key players involved with the emergence of wireless communications.

    Short Bio:
    Andreas Antoniou received the B.Sc.(Eng.) and Ph.D. degrees in Electrical Engineering from the University of London in 1963 and 1966, respectively, and is a Fellow of the IET and IEEE. He taught at Concordia University from 1970 to 1983, was the founding Chair of the Department of Electrical and Computer Engineering, University of Victoria, B.C., Canada, from 1983 to 1990, and is now Professor Emeritus. His teaching and research interests are in the area of digital signal processing. He is the author of Digital Signal Processing: Signals, Systems, and Filters, McGraw-Hill, 2005, and the co-author with Wu-Sheng Lu of Practical Optimization: Algorithms and Engineering Applications, Springer, 2007. Dr. Antoniou served as Associate/Chief Editor for IEEE Transactions on Circuits and Systems (CAS) from 1983 to 1987, as a Distinguished Lecturer of the IEEE Signal Processing and the Circuits and Systems Societies during 2003-2004 and 2006-2007, respectively, and as General Chair of the 2004 International Symposium on Circuits and Systems. He was awarded the CAS Golden Jubilee Medal by the IEEE Circuits and Systems Society, the B.C. Science Council Chairman’s Award for Career Achievement for 2000, the Doctor Honoris Causa degree by the National Technical University, Athens, Greece, in 2002, the IEEE Circuits and Systems Society Technical Achievement Award for 2005, the 2008 IEEE Canada Outstanding Engineering Educator Silver Medal, the IEEE Circuits and Systems Society Education Award for 2009, the 2011 Craigdarroch Gold Medal for Career Achievement and the 2011 Legacy Award for Research both from the University of Victoria, Victoria, Canada. <br/><br/> The slides of the presentation are available at: <a target=_blank href="http://www.ece.uvic.ca/~andreas/RLectures/RootsWCom-Pres.pdf">http://www.ece.uvic.ca/~andreas/RLectures/RootsWCom-Pres.pdf</a>.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Faults: Foe or Friend?, Dr. Yiannakis Sazeides (University of Cyprus, Cyprus), Thursday, April 5, 2012, 09.30-10.30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Faults: Foe or Friend?

    Speaker: Dr. Yiannakis Sazeides
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, April 5, 2012
    Time: 09.30-10.30 EET
    Host: Paraskevas Evripidou (skevos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.sazeides

    Abstract:
    The traditional performance-cost benefits enjoyed for decades from scaling of device area are challenged by the slowdown of voltage scaling and a shift towards probabilistic design and less reliable silicon primitives. These developments lead to pessimistic projections that it will be impossible to operate all on-chip resources, even at the minimum voltage for safe operation, due to power constraints, and the growing design and operational margins, used to provide silicon primitives with resiliency against variations, will consume the scaling benefits. Our attempt, presented in this talk, towards reversing these negative trends consists of first order models that facilitate rapid assessment of the reliability challenges and opportunities, and of cost-efficient resiliency techniques.

    Short Bio:
    Yiannakis Sazeides is an Assistant Professor at the University of Cyprus. He was awarded a PhD from the University of Wisconsin in 1999. He worked at Compaq and Intel towards the development and design of high performance processors. His research interests lie in the area of Computer Architecture with particular emphasis on reliability, memory hierarchy, temperature, and analysis of dynamic program behavior.

    Note:
    This colloquium is part of the speaker's procedure for evaluation and promotion from Assistant Professor to Associate Professor.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: All You Will Never Have Wanted to Know on Branch Predictors, Dr. André Seznec (IRISA/INRIA Rennes, France), Thursday, April 5, 2012, 17:00-18:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    All You Will Never Have Wanted to Know on Branch Predictors

    Speaker: Dr. André Seznec
    Affiliation: IRISA/INRIA Rennes, France
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, April 5, 2012
    Time: 17:00-18:00 EET
    Host: Yanos Sazeides (yanos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.seznec

    Abstract:
    Dynamic branch prediction is still one of the most important processor performance enabler. Branch prediction was introduced by J. Smith around 1980, then using branch history was proposed in 1991. Then, for about ten years, branch prediction was a hot research topic. Since 2000, interest of the computer architecture research community for branch prediction has faded. However, at the same time, there has been more progress on branch prediction accuracy between 2002 (presentation of the EV8 branch predictor) and 2006 (2nd Championship Branch Prediction) than during the 10 previous years. <br/><br/> In this talk, I will introduce the geometric history length predictors, O-GEHL and TAGE. I respectively presented O-GEHL at the 1st Championship on Branch Prediction (CBP-1) in december 2004 and TAGE at the 2nd Championship on Branch Prediction (CBP-2) in december 2006. Both O-GEHL and TAGE combine several prediction tables. They use a geometric series of history lengths for indexing these prediction tables. O-GEHL computes its final prediction through an adder tree, while TAGE relies on partial-tag match. TAGE constitutes currently the state-of-the-art in branch prediction as confirmed by the 3rd Championship on Branch Prediction (june 2011).

    Short Bio:
    André Seznec got a Doctorat ès Sciences in computer sciences from University of Rennes~I in June 1987. He was hired as a researcher at INRIA Rennes in October 1986. He was promoted as Research Director at INRIA in 1994 and as Senior Research Director (DR1) in 2002. He has been leading the CAPS then ALF project-team at INRIA Rennes since 1994. From Feb. 1999 to Feb. 2000, he spent a sabbatical yearwith the VSSAD, Alpha Development Group at Compaq (Shrewsbury, Massachusetts). André Seznec has focused his research on processor architecture since the beginning of his Ph.D. thesis in 1983. He has made many contributions on vector supercomputers, pipeline architecture and SMT and multicore architecture. His most significant contributions are on cache architecture and branch prediction. André Seznec has published more than 20 papers in international journals including IEEE transactions on computers, IEEE transaction on parallel and distributed computing, ACM Transactions on Architecture and Code Optimizations, Journal on Instruction Level Parallelism and ACM Transaction on Modeling and Computer Simulations. He has published over 40 papers in international conferences on computer architecture. André Seznec has directed 15 Ph. D. thesis. In 2010, André Seznec has got an ERC advanced grant. For more information: http://www.irisa.fr/alf/index.php?option=com_content&view=article&id=13&Itemid=15

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Size-l Object Summaries for Relational Keyword Search, Dr. George Fakas (Manchester Metropolitan University, UK), Friday, Mar. 30, 2012, 14:00-15:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Size-l Object Summaries for Relational Keyword Search

    Speaker: Dr. George Fakas
    Affiliation: Manchester Metropolitan University, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, Mar. 30, 2012
    Time: 14:00-15:00 EET
    Host: Costas Pattichis (pattichi AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.fakas

    Abstract:
    A previously proposed keyword search paradigm produces, as a query result, a ranked list of Object Summaries (OSs). An OS is a tree structure of related tuples that summarizes all data held in a relational database about a particular Data Subject (DS). However, some of these OSs are very large in size and therefore unfriendly to users that initially prefer synoptic information before proceeding to more comprehensive information about a particular DS. We investigate the effective and efficient retrieval of concise and informative OSs. We argue that a good size-l OS should be a stand-alone and meaningful synopsis of the most important information about the particular DS. More precisely, we define a size-l OS as a partial OS composed of l important nodes. More precisely, we propose size-l OS(t)s and size-l OS(a)s that consist of l tuples and attributes respectively. For this purpose, we propose an optimal dynamic programming algorithm (which requires exponential time), two greedy algorithms and two pre-processing algorithms. Experimental evaluation on DBLP, DBLP(M) and TPC-H databases verifies the effectiveness and efficiency of our approach.

    Short Bio:
    Georgios Fakas is a Senior Lecturer at the School of Computing, Mathematics and Digital Technology (CMDT), Manchester Metropolitan University. Before that, he worked as a Research Associate at EPFL (Lausanne), Switzerland and at the University of Cyprus, Cyprus. He obtained his Ph.D., M.Phil and B.Sc. in Computation from the Department of Computation, UMIST, Manchester, UK. He was awarded the “ERCIM” Fellowship and the “Hosting of Experienced Researchers from Abroad” Fellowship from the Research Promotion Foundation of Cyprus.

    Video Online:
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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: On Direct Rendering of Self Trimmed Surfaces, Dr. Ioannis Fudos (University of Ioannina, Greece), Friday, Mar. 23, 2012, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    On Direct Rendering of Self Trimmed Surfaces

    Speaker: Dr. Ioannis Fudos
    Affiliation: University of Ioannina, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, Mar. 23, 2012
    Time: 15:00-16:00 EET
    Host: Yiorgos Chrysanthou (yiorgos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.fudos

    Abstract:
    We explore different semantics for the solid defined by a self-crossing surface (immersed sub-manifold). Specifically, we introduce rules for the interior/exterior classification of the connected components of the complement of a self-crossing surface produced through a continuous deformation process of an initial embedded manifold. We propose efficient GPU algorithms for rendering the boundary of the regularized union of the interior components, which is a subset of the initial surface and is called the trimmed boundary or simply the "trim". This classification and rendering process is accomplished in realtime through a rasterization process without computing any self-intersection curve. The solid bounded by the trim can be combined with other solids and with half-spaces using Boolean operations and hence may be capped and used as a primitive in direct CSG rendering. Being able to render the trim in realtime makes it possible to adapt the tessellation of the trim in realtime by using view-dependent levels-of-details and adaptive subdivision. Joint work with: Jarek Rossignac and Andreas Vasilakis

    Short Bio:
    Ioannis Fudos is an Associate Professor at the Department of Computer Science of the University of Ioannina. He is currently on sabbatical leave at the Department of Computer Science of the University of Cyprus. He received a diploma in Computer Engineering and informatics from University of Patras, Greece in 1990 and an MSc and PhD in Computer Science both from Purdue University, USA in 1993 and 1995, respectively. His research interests include animation, rendering, morphing, CAD systems, reverse engineering, geometry compilers, solid modeling, and image retrieval. He has published in well established conferences and journals and has received funding from EC, the General Secretariat of Research and Technology, Greece, the Greek Ministry of National Education, Life Long Learning and Religious Affairs and other sources.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: On the Elasticity of NoSQL Databases over Cloud Management Platforms, Dr. Dimitrios Tsoumakos (University of Ionian and NTUA, Greece), Friday, Mar. 2, 2012, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    On the Elasticity of NoSQL Databases over Cloud Management Platforms

    Speaker: Dr. Dimitrios Tsoumakos
    Affiliation: University of Ionian and NTUA, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, Mar. 2, 2012
    Time: 15:00-16:00 EET
    Host: George Pallis (gpallis AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.tsoumakos

    Abstract:
    NoSQL databases focus on analytical processing of large scale datasets, offering increased scalability over commodity hardware. One of their strongest features is elasticity, which allows for fairly portioned premiums and high-quality performance. Yet, the process of adaptive expansion and contraction of resources usually involves a lot of manual effort during cluster configuration. In this work, we perform a thorough study of the elasticity feature on some popular NoSQL databases over an open-source cloud computing platform. We also present a prototype implementation of a decision making system that enables automatic elastic operations of any NoSQL engine based on administrator or application-specified constraints.

    Short Bio:
    Dr. Tsoumakos is an Assistant Professor in the Department of Informatics of the Ionian University. He is also a senior researcher at the Computing Systems Laboratory of the National Technical University of Athens (NTUA). He received his Diploma in Electrical and Computer Engineering from NTUA in 1999 and joined the graduate program in Computer Sciences at the University of Maryland in 2000, where he received his M.Sc. (2002) and Ph.D. (2006). His research interests lie in the area of distributed data management, particularly in designing and implementing adaptive, scalable and bandwidth-efficient schemes for data storage, retrieval and dissemination. Applications over Cloud platforms, Peer-to-Peer and Grid systems are considered. He has also been involved in Database research, especially in designing distributed indexing schemes for sharded databases. His most recent projects relate to automatic elasticity provisioning for NoSQL engines and scalable RDF query processing using NoSQL and MapReduce.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Hardware/Software Co-designed Processors, Dr. Kyriakos Stavrou (Intel Labs Barcelona, Spain), Tuesday, February 28, 2012, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Hardware/Software Co-designed Processors

    Speaker: Dr. Kyriakos Stavrou
    Affiliation: Intel Labs Barcelona, Spain
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, February 28, 2012
    Time: 15:00-16:00 EET
    Host: Pedro Trancoso (pedro AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.stavrou

    Abstract:
    The lecture presents the paradigm of Hardware / Software co-designed processors. It compares it to the traditional microprocessor design and identifies the key opportunities and challenges. During the lecture we will analyze both the Hardware and the Software components and pay special attention to the synergy between them. In particular, we will identify the key components of the SW starting from the interpretation to the optimization level. Regarding the HW we will look into how the co-design enables simplicity and lower power consumption. The co-designed paradigm enables opportunities that are not easy to achieve on traditional architectures. The lecture will look into such scenarios through exploiting the dynamic information. Finally, we will also briefly outline the relevant published work on the field.

    Short Bio:
    Kyriakos Stavrou is currently a Senior Research Scientist at the Intel Labs Barcelona. He received his PhD from the Computer Science Department of the University of Cyprus after finishing his undergraduate studies at the Electrical and Computer Engineering department of the National Technical University of Athens. His research interests are in the area of HW/SW co-designed processors, parallel architectures and the data-flow model of execution.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: «Εις Άτοπο Απαγωγή και Λογική Επιχειρηματολογίας» Από την Αρχαιότητα στον Κόσμο του Διαδικτύου, Prof. Antonis Kakas (University of Cyprus, Cyprus), Wednesday, Feb. 15, 2012, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    «Εις Άτοπο Απαγωγή και Λογική Επιχειρηματολογίας» Από την Αρχαιότητα στον Κόσμο του Διαδικτύου

    Speaker: Prof. Antonis Kakas
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, Feb. 15, 2012
    Time: 15:00-16:00 EET
    Host: Yiannis Dimopoulos (yannis AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.kakas

    Abstract:
    Οι Αρχαίοι Έλληνες είχαν αντιληφθεί ότι υπάρχει η δυνατότητα να φθάσουμε ή να εξαγάγουμε συμπεράσματα επιχειρηματολογώντας, αντί για το ίδιο το συμπέρασμα, για την αντίθετη άποψη και δείχνοντας ότι αυτή η αντίθετη θέση καταλήγει σε άτοπο, δηλαδή σε συμπεράσματα τα όποια είναι αδύνατο να ισχύουν. Η κατάληξη της αντίθετης θέσης σε άτοπο μας επιτρέπει έτσι να συμπεραίνουμε ότι η θέση ισχύει. Η έμμεση αυτή μέθοδος συμπερασματολογίας ονομάστηκε «Εις Άτοπο Απαγωγή» και αργότερα «Reductio Ad Absurdum» στα λατινικά και «Proof by Contradiction» στα αγγλικά. Η ομιλία θα παρουσιάσει σύντομα την ιστορία της εξέλιξης της ιδέας της «Εις Άτοπο Απαγωγή» και πως ενσωματώνεται αυτή η μέθοδος στα συστήματα λογικής, όπως αρχικά μελέτησε ο Αριστοτέλης, και αργότερα στη σύγχρονη τυπική λογική και στα τυπικά συστήματα λογικής αποδείξεως που αποτελούν θεμέλιο των Μαθηματικών και της Πληροφορικής καθώς επίσης και της σύγχρονης επιστημονικής σκέψης και διαμόρφωσης επιστημονικών θεωριών. Μελετώντας μια αδυναμία αυτής της ενσωμάτωσης του «Εις Άτοπο Απαγωγή» στην τυπική λογική η ομιλία θα παρουσιάσει τη δυνατότητα ορισμού μιας νέας μορφής λογικής, που ονομάζεται Λογική Επιχειρηματολογίας (Argumentation Logic). Η λογική αυτή θεωρεί τους λογικούς συλλογισμούς ως επιχειρήματα και βασίζεται σε ένα γενικό ορισμό της έννοιας του αποδεκτού επιχειρήματος που αντικαθιστά την έννοια της αλήθειας στη μαθηματική τυπική λογική. Η Λογική Επιχειρηματολογίας είναι ισοδύναμη με την Κλασσική Λογική (Προτασιακό Λογισμό) όταν το σύνολο των παραδοχών (η δεδομένη θεωρία) από το οποίο εξάγουμε τα συμπεράσματα είναι συνεπές. Όταν η δεδομένη θεωρία είναι ασυνεπής η Λογική Επιχειρηματολογίας δεν είναι τετριμμένη, όπως την Κλασσική Λογική, αλλά την επεκτείνει με ένα φυσικό τρόπο που απορρέει από την αρχική προσέγγιση της λογικής ως ένα σύστημα τυποποίησης της επιχειρηματολογίας όπως πρώτα μελέτησαν οι Αρχαίοι Έλληνες και ο Αριστοτέλης. Η Λογική Επιχειρηματολογίας παρέχει τη δυνατότητα αυτοματοποίησης της διαδικασίας της επιχειρηματολογίας σε ένα πλαίσιο το οποίο είναι κατάλληλο για διάφορες εφαρμογές διαδικτύου όπως (ι) την αυτοματοποίηση της εφαρμογής κανόνων και νομοθεσίας που διέπουν το ηλεκτρονικό εμπόριο και επίλυσης διαφορών συναλλαγής ή (ιι) την αυτοματοποίηση της αξιολόγησης της αξιοπιστίας προϊόντων ή υπηρεσιών που παρέχονται στο διαδίκτυο μέσα από το σύνολο των διαφόρων ηλεκτρονικών κριτικών (online reviews) που βρίσκονται στο διαδίκτυο για αυτά τα προϊόντα και υπηρεσίες. Για την παρακολούθηση της ομιλίας δεν χρειάζονται εξειδικευμένες γνώσεις Πληροφορικής ή Μαθηματικών.

    Short Bio:
    Ο Αντώνης Κάκας είναι Καθηγητής Πληροφορικής στο Πανεπιστήμιο Κύπρου. Ο Καθ. Κάκας έχει παρακολουθήσει τις πτυχιακές του σπουδές του στο Imperial College, Πανεπιστήμιο Λονδίνου, Ηνωμένο Βασίλειο (B.Sc. σε Μαθηματικά, 1980) και μεταπτυχιακά στο Imperial College, Πανεπιστήμιο Λονδίνου, Ηνωμένο Βασίλειο (M.Sc. σε Πληροφορική, 1987 και Ph.D. σε Θεωρητική Φυσική, 1984). Έχει εργαστεί ως μεταδιδακτορικός ερευνητής στο Kings College, Ηνωμένο Βασίλειο (1984-1986), το Πανεπιστήμιο της Ζυρίχης, Ελβετία (1987-1988), και στο Imperial College, Ηνωμένο Βασίλειο (1988-1992). Είναι μέλος της εκδοτικής επιτροπής των διεθνών επιστημονικών περιοδικών: AI Communications, Journal of Applied Logic and Journal of Theory and Applications of Logic Programming. Τα ερευνητικά ενδιαφέροντα του συμπεριλαμβάνουν Computational Logic, Abduction & Induction, Argumentation, Temporal Reasoning και Cognitive Agents.

    Video Online:
  • Recorded Video available through
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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: We.b: The web of short URLs, Dr. Demetris Antoniades (University of Crete and FORTH, Greece), Friday, Feb. 10, 2012, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    We.b: The web of short URLs

    Speaker: Dr. Demetris Antoniades
    Affiliation: University of Crete and FORTH, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, Feb. 10, 2012
    Time: 15:00-16:00 EET
    Host: Marios D. Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.antoniades

    Abstract:
    Short URLs have become ubiquitous. Especially popular within social networking services, short URLs have seen a significant increase in their usage over the past years, mostly due to Twitter’s restriction of message length to 140 characters. In this talk, I will present a first characterization on the usage of short URLs. Specifically, our goal is to examine the content short URLs point to, how they are published, their popularity and activity over time, as well as their potential impact on the performance of the web. Our study is based on traces of short URLs as seen from two different perspectives: i) collected through a large-scale crawl of URL shortening services, and ii) collected by crawling Twitter messages. The former provides a general characterization on the usage of short URLs, while the latter provides a more focused view on how certain communities use shortening services. Our analysis highlights that domain and website popularity, as seen from short URLs, significantly differs from the distributions provided by well publicised services such as Alexa. The set of most popular websites pointed to by short URLs appears stable over time, despite the fact that short URLs have a limited high popularity lifetime. Surprisingly short URLs are not ephemeral, as a significant fraction, roughly 50%, appears active for more than three months. Overall, our study emphasizes the fact that short URLs reflect an “alternative” web and, hence, provide an additional view on web usage and content consumption complementing traditional measurement sources. Furthermore, our study reveals the need for alternative shortening architectures that will eliminate the non-negligible performance penalty imposed by today’s shortening services.

    Short Bio:
    Demetris Antoniades received his Ph.D. degree in Computer Science from the Computer Science Department of the University of Crete in December 2011. His research interests include Internet measurements and monitoring, analysis of Web 2.0 applications and services, Online Social networks and network traffic anonymization.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Future Many-core Processors: Challenges and Solutions, Dr. Pedro Trancoso (University of Cyprus, Cyprus), Friday, Feb. 3, 2012, 09:30-10:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Future Many-core Processors: Challenges and Solutions

    Speaker: Dr. Pedro Trancoso
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, Feb. 3, 2012
    Time: 09:30-10:30 EET
    Host: Costas Pattichis (pattichi AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.trancoso

    Abstract:
    Processor design has evolved considerably in the last years. In order to cope with Moore's Law, processors became increasingly complex and their power consumption reached unacceptable levels. This led to a paradigm shift to what currently is the de-facto standard the multi-core processors. Even though these processors are able to offer high performance at a lower power consumption level, they introduce new challenges, particularly as the number of cores per processor increases. It is expected that in the future we will have thousands of cores within a chip and that there will be cores of different characteristics on the same chip. Such processors are known as heterogeneous many-core chips. In this presentation an overview of the past, present, and future research projects dealing with these issues will be given. The focus is on two topics: TFlux, an implementation of the Data-Driven Multithreading execution model and the Fine-grain parallelism for different multi-cores and accelerators. In addition, results from different applications and scheduling for the Intel Single-chip Cluster Computer (SCC) 48-core processor will be presented. All projects are unified under a common umbrella: the vision that future heterogeneous many-core processors will be packaged together with a virtualization layer hiding the complexity and managing the resources to exploit the best performance.

    Short Bio:
    Pedro Trancoso is an Assistant Professor at the Department of Computer Science at the University of Cyprus, which he joined in 2002. He has a PhD and MSc. in Computer Science from the University of Illinois at Urbana-Champaign, USA. His research interests are in the area of Computer Architecture and include Multi-core Architectures, Memory Hierarchy, Parallel Processing and Programming Models, Database Workloads, and High-Performance Computing. Currently his research team, Computer Architecture, Systems and Performance Evaluation Research - CASPER (www.cs.ucy.ac.cy/carch/casper) is composed of 5 PhD students (2 of them jointly with colleagues in Spain and Portugal), 1 MSc student, and 5 undergraduate students. The latest funding for his research include the participation in the TERAFLUX EU FP7 IP project (4 years) and the lending of a 48-core experimental processor, the Intel SCC, by the Intel Corporation. He is also a member of the HiPEAC Network of Excellence.

    Note:
    This colloquium is part of the speaker's procedure for evaluation and promotion from Assistant Professor to Associate Professor.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Smart Grid Security: Issues and Challenges, Dr. Chakib Bekara (Fraunhofer FOKUS Berlin, Germany), Wednesday, Feb. 1, 2012, 13:00-14:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Smart Grid Security: Issues and Challenges

    Speaker: Dr. Chakib Bekara
    Affiliation: Fraunhofer FOKUS Berlin, Germany
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, Feb. 1, 2012
    Time: 13:00-14:00 EET
    Host: Andreas Pitsillides (Andreas.Pitsillides AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.bekara

    Abstract:
    The Smart Grid (SG) is the classical power grid augmented with distributed renewable energy sources and storage capacities, and which massively make use of ICT (Information and Communication Technology). The SG aims at ensuring availability, efficiency, cost-effective and security to the energy supply by making a real-time balance between energy production and energy consumption thinks to a two way communication between the different shareholders, and especially between the Utility and the customer. While the use of SG is promising in the next future, several challenges and issues are facing its large deployment and impacting its performances. In this presentation we’ll review some security related issues and challenges that are threating the deployment of the SG, and describe two features: Key Management in the Smart Grid, and the Customer’s Privacy.

    Short Bio:
    Chakib BEKARA holds an engineer degree in Computer Science (CS) from National Institute of Informatics in Algiers in 2003, and a Master degree in CS form Technology University of Compiegne (France) in 2004 and a Phd degree in CS form TELECOM Institute Sud-Paris in 2008. He worked during two years as a lecturer in French universities, and actually he is an ERCIM post-doctoral research fellow at Fraunhofer FOKUS Berlin (Germany). His research of interest include Security in Wireless and ad-hoc networks, Security in Wireless Sensor Networls, Security in Smart Grid/Smart Metering and Critical Infrastructure Protection'

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Magnetic Resonance Elastography for Age-Related Dementias, Prof. John G. Georgiadis (University of Illinois at Urbana-Champaign, USA), Friday, Jan. 13, 2012, 15:00-14:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Magnetic Resonance Elastography for Age-Related Dementias

    Speaker: Prof. John G. Georgiadis
    Affiliation: University of Illinois at Urbana-Champaign, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, Jan. 13, 2012
    Time: 15:00-14:00 EET
    Host: Costas Pattichis (pattichi AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.georgiadis

    Abstract:
    Idiopathic normal pressure hydrocephalus (NPH), one of the few debilitating dementias afflicting our growing aged population that can be treated, is diagnosed by an invasive test requiring cerebrospinal fluid (CSF) reduction and gait analysis, prior to establishing a permanent shunt. Since there is a significant diagnostic overlap between NPH and other dementias, primarily Alzheimer’s disease, which do not respond to the CSF reduction, enhancing the sensitivity and specificity of the diagnostic evaluation has severe implications for the diagnosis and treatment of NPH. We are utilizing Magnetic Resonance Elastography to assess how the viscoelastic properties of the brain of NPH patients who respond to the treatment differ from those who do not. This project is highly relevant to public health because it has the potential to enhance our ability to diagnose and treat this disease, elucidate its etiology, as well as effectively detect and combat other dementias that will impact approximately 10% of people older than 65 years.

    Short Bio:
    John Georgiadis is currently the R. W. Kritzer Professor of Mechanical Engineering and Bioengineering at the University of Illinois at Urbana-Champaign. He obtained his Dipl. Eng from the National Technical University of Athens, and his MS and PhD from UCLA. Georgiadis’ research expertise lies in the intersection of fluid mechanics & transport phenomena, biomechanics, and Magnetic Resonance Imaging (MRI). The long-term goal of his group is to develop new MRI modalities to improve the quality of life of the elderly. He has used MRI (in vitro) to quantify fluid velocity, diffusion, and temperature fields in complex phantoms, and (in vivo) to map axonal tracts in the human pons and hippocampus, myofiber orientation and fat distribution in skeletal muscle, and to measure perfusion in muscle. Georgiadis has recently led an NIH-funded team to develop and validate the use of Diffusion Tensor Imaging and Magnetic Resonance Spectroscopy to measure muscle quality. The team linked the effect of nutrition and exercise on the histoarchitecture and function of leg muscles in obese older women at risk for disability due to disordered body composition. The current work in Magnetic Resonance Elastography is a natural continuation of the team’s effort to develop new biomarkers for age-related disorders.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: The Future of Wireless Networks: On the Importance of Overhearing and Cooperation, Dr. Lavy Libman (University of Sydney, Australia and Technion, Israel), Thursday, Jan. 12, 2012, 12:00-13:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    The Future of Wireless Networks: On the Importance of Overhearing and Cooperation

    Speaker: Dr. Lavy Libman
    Affiliation: University of Sydney, Australia and Technion, Israel
    Category: Colloquium
    Location: Room 147, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, Jan. 12, 2012
    Time: 12:00-13:00 EET
    Host: Andreas Pitsillides (Andreas.Pitsillides AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.libman

    Abstract:
    A fundamental feature of wireless communication is that it involves a broadcast medium, where any transmission can be heard, or unintentionally overheard, by any node within some area around the transmitter. Nevertheless, for many years, the dominant approach in the design, management and operation of wireless networks, which is evident in the vast majority of prevailing standards, has been to make the wireless medium resemble a wired link in every possible way, using classical techniques ranging from multiplexing and channel allocation to directional antennas. In the last few years, increasing interest started to emerge in approaches that aim to take advantage of the broadcast nature of the wireless medium and the ability of nodes to overhear their peers' transmissions, rather than treating it as a problem to be mitigated (interference). This talk will provide an overview of recent and emerging methods designed to make use of overheard information and allow nodes to cooperate in non-traditional ways in order to deliver it to its destination. Such methods, which include cooperative retransmission, opportunistic routing, and network coding, promise significant boosts in the capacity and reliability of wireless networks, and will become increasingly important in the future due to the exponential demand growth for wireless and mobile data communications, where traditional methods struggle to cope.

    Short Bio:
    Lavy Libman received his B.Sc. degrees in Electrical Engineering and in Computer Engineering, and his M.Sc. and Ph.D. degrees in Electrical Engineering, from the Technion - Israel Institute of Technology in 1992, 1997, and 2003, respectively. In 2003, he joined National ICT Australia (NICTA) as a researcher in the Networks and Pervasive Computing program (now known as the Networks research group). In early 2009, he became a Senior Lecturer in the School of Information Technologies, University of Sydney, until October 2011. He is currently a Visiting Scientist at the Dept. of Electrical Engineering in the Technion. His research interests include all aspects of communication networks, and predominantly revolve around the design and performance optimisation of wireless networks, with a particular focus on cooperative and opportunistic techniques, protocols for resource-limited devices, and mechanisms for distributed coordination. He is Senior Member of the IEEE and its Communications Society and is serving as an associate editor of IEEE Transactions on Wireless Communications. He is a publicity co-chair of IEEE Infocom 2012, served as a technical program co-chair of ICCCN 2010 and WiOpt 2010, and continues to be involved as a program committee member of several major international conferences, including IEEE Infocom, IEEE LCN, ACM MSWiM, and WiOpt.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Studying Visual Attention in 3D Computer Games, Dr. Efstathios Stavrakis (University of Cyprus, Cyprus), Wednesday, Jan. 11, 2012, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Studying Visual Attention in 3D Computer Games

    Speaker: Dr. Efstathios Stavrakis
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, Jan. 11, 2012
    Time: 11:00-12:00 EET
    Host: Yiorgos Chrysanthou (yiorgos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2012.stavrakis

    Abstract:
    The tremendous growth of the computer gaming population over the past decade has pushed the limits of both software and hardware design. The games industry is currently one of the main driving forces behind faster and featureful graphics hardware architectures, as well as optimized software and real-time graphics algorithms. A recent trend in games-related research is to obtain, analyze and study data of user behavior with the ultimate goal of understanding better the user and tailoring the gaming experience to each individual. One of the most prominent characteristics of a gameplayer's behavior is visual attention, since it provides information on what the user is looking (or likely to look) at in a computer game. With the advent of affordable and accurate eye-tracking devices it has become possible to obtain where game players are looking on the computer screen, but provides little insight on what is being attended within the computer game. In this talk a novel computational pipeline for obtaining, analyzing and studying gaze data to infer visual attention in computer games will be presented, along with seminal work on algorithms for inferring attended objects from gaze data in challenging 3D computer gaming environments.

    Short Bio:
    Efstathios Stavrakis holds a Ph.D. in Computer Science from the Vienna University of Technology (Austria) and has studied for an MSc. in Computer-Aided Graphical Technology Application and a BA (Hons) in Creative Visualisation at the University of Teesside (UK). He has conducted and published research at the intersection of computer graphics and vision, non-photorealistic rendering, visual perception, eye-tracking and psychophysics, as well as 3D audio rendering for VEs. He brings a wealth of experience in graphical algorithms, games technologies, interface design and software development. Previously, he has held posts at the Technical University of Vienna (Austria), at INRIA Sophia Antipolis – Méditerranée (France) and the Glasgow School of Art (UK). He is currently a Visiting Lecturer at the University of Cyprus.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Uncertainty for Quality and Taste Product Attributes: Competition, Information Disclosure Investments and the Role of Infomediaries, Dr. Panos Markopoulos (University of Cyprus, Cyprus), Monday, Nov. 28, 2011, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Uncertainty for Quality and Taste Product Attributes: Competition, Information Disclosure Investments and the Role of Infomediaries

    Speaker: Dr. Panos Markopoulos
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, Nov. 28, 2011
    Time: 11:00-12:00 EET
    Host: Marios D. Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.markopoulos

    Abstract:
    In this presentation, I aim to help the audience understand current research in the "Information Systems & Economics" community, and also to briefly present my own work. In the first 10-15 minutes, I will present a snapshot of the field, as well as current trends in popular topics and research methodologies. Next, I will present a game theoretic model of a market where consumers are uncertain about exact product characteristics. Consumers' uncertainty is controlled both by 3rd party infomediaries that control the "ambient" level of market information, as well as by the product manufacturers themselves, through investments in reducing consumer product uncertainty. I will focus mostly on what the model predicts about the impact of technologies that reduce consumer uncertainty about product quality and taste-related attributes. For example, we will discuss the success of technologies that emphasize personal taste, such as collaborative filtering, in driving sales in the so called "long tail" of products - products with low sales frequency prior to the advent of online markets. Finally, we will also discuss the socially optimal way to operate websites that reduce consumer uncertainty about available products.

    Short Bio:
    Dr. Markopoulos completed his PhD in the University of Pennsylvania in 2004 studying the mechanism by which consumers receive information about products and services in electronic markets. His professional experience includes the Athens Stock Exchange, IBM Research, and the elite management consulting firm McKinsey & Co, where he consulted for the top management of leading corporations in Europe, USA and Canada. As an academic, he has taught in Cornell University and the Wharton Business School, where he was a visiting Lecturer in 2005. He was a co-founder of Media Society, a technology development firm for electronic media, and holds patents in the field of targeted advertising.

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    Colloquium: Design for Usable or Secure Interactive Software Systems? A false dilemma, Dr. Christos Fidas (University of Cyprus, Cyprus), Friday, Nov. 25, 2011, 14:00-15:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Design for Usable or Secure Interactive Software Systems? A false dilemma

    Speaker: Dr. Christos Fidas
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, Nov. 25, 2011
    Time: 14:00-15:00 EET
    Host: Georgia Kapitsaki (gkapi AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.fidas

    Abstract:
    Computer human interaction is nowadays shifting from traditional desktop computers and standalone applications towards mobile computing devices and cloud-based oriented applications and services, mainly triggered by developments in network communication technologies. Within this realm, Security and Privacy issues of interactive systems are considered of paramount importance as it is known that the consequences of a security breach can harm the credibility and legal liability of an organization, leading to loss of users' trust and acceptance while it exponentially increases maintenance and support costs. This talk will provide a brief survey of the combined area of usable security based on state of the art research in this field. Among others, the relationship between usability and security will be investigated with concrete case studies in this area like (Authentication mechanisms, CAPTCHA challenges "Computer Automated Public Turing test to tell Computer and Humans Apart" etc.)

    Short Bio:
    Dr. Fidas received a Diploma and a PhD in Electrical & Computer Engineering from the University of Patras, Greece (2000) and (2004) respectively. He has over 10 years of academic, research and teaching experience at the University of Patras, University of Ioannina, University of Western Greece and Technical Education Colleges. He is currently a Visiting Lecturer at the Department of Computer Science of the University of Cyprus. His research interests include Software Technology, Human Computer Interaction, Analysis Design and Evaluation of Interactive Systems. He has published numerous articles in recognized scientific journals and conferences. More than one hundred citations are referencing his published papers (G-Index:10, H-Index:7). He is a member of the editorial board in the e-Minds International Journal of Human Computer Interaction (http://www.e-minds.com/) and reviewer in the ICALT - IEEE International Conference on Advanced Learning Technologies.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Real-world Polymorphic Attack Detection, Prof. Evangelos Markatos (FORTH-ICS and Univ. of Crete, Greece), Friday, Nov. 25, 2011, 10:00-11:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Real-world Polymorphic Attack Detection

    Speaker: Prof. Evangelos Markatos
    Affiliation: FORTH-ICS and Univ. of Crete, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, Nov. 25, 2011
    Time: 10:00-11:00 EET
    Host: Marios D. Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.markatos

    Abstract:
    As state-of-the-art attack detection technology becomes more prevalent, attackers have started to employ evasion techniques such as code obfuscation and polymorphism to defeat existing defenses. We have recently proposed network-level emulation, a heuristic detection method that scans network traffic to detect polymorphic attacks. Our approach uses a CPU emulator to dynamically analyze every potential instruction sequence in the inspected traffic, aiming to identify the execution behavior of certain malicious code classes, such as self-decrypting polymorphic shellcode. In this work, we present results and experiences from deployments of network-level emulation in production networks. After more than a year of continuous operation, our prototype implementation has captured more than a million attacks against real systems, while so far has not resulted to any false positives. The observed attacks employ a highly diverse set of exploits, often against less widely used vulnerable services, and in some cases, sophisticated obfuscation schemes.

    Short Bio:
    Prof. Evangelos Markatos received his diploma in Computer Engineering from the University of Patras in 1988, and the M.S and Ph.D. degrees in Computer Science from the University of Rochester, NY in 1990 and 1993 respectively. Since 1992, he collaborates with the Institute of Computer Science of the Foundation for Research and Technology - Hellas (ICS-FORTH) where he is currently the founder and head of the Distributed Computing Systems Laboratory. He conducts research in several areas including distributed and parallel systems, the World-Wide Web, Internet Systems and Technologies, as well as Computer and Communication Systems Security. He has been the project manager of the LOBSTER and NoAH projects, both funded in part by the European Union and focusing on developing novel approaches to network monitoring and network security. He is currently the project manager of the i-code and SysSec projects. Since 1992, he has also been affiliated with the Computer Science Department of the University of Crete, where he is currently a full Professor.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Digital Medical Education: Yesterday, Today and Tomorrow, Dr. Panagiotis Bamidis (Aristotle University, Greece), Wednesday, Nov 9, 2011, 16:30-17:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Digital Medical Education: Yesterday, Today and Tomorrow

    Speaker: Dr. Panagiotis Bamidis
    Affiliation: Aristotle University, Greece
    Category: Colloquium
    Location: Room 201, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, Nov 9, 2011
    Time: 16:30-17:30 EET
    Host: Christos Schizas (schizas AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.bamidis

    Abstract:
    (in Greek) Είναι γεγονός πως η ιατρική εκπαίδευση αλλάζει. Επιχειρώντας μια σύντομη ιστορική αναδρομή, θα διαπιστώσουμε πως στον ορίζονται διαγράφονται από τις Ιατρικές Σχολές και αντίστοιχους Ιατρικούς Συλλόγους νέες επιτακτικές εκπαιδευτικές ανάγκες που επιζητούν άμεση υλοποίηση. Οι σύγχρονες αλλαγές και εξελίξεις των τεχνολογιών του παγκόσμιο ιστού μπορούν να χρησιμοποιηθούν για να ικανοποιήσουν τις παραπάνω ανάγκες, αφού διαμορφώνουν νέα πλαίσια συνεργασίας και εννοιολογικής χρήσης και προσέγγισης της λειτουργίας του όλου διαδικτύου. Στη διάλεξη αυτή θα γίνει μια διαδρομή στις τεχνολογίες αυτές από δύο πλευρές: την πλευρά του συνεργατικού/κοινωνικού ιστού/διαδικτύου (Web2.0) και την πλευρά του σημασιολογικού ιστού (Web3.0). Επίκεντρο της προσέγγισης θα είναι η εφαρμογή αυτών των τεχνολογιών στη διαμόρφωση ενός νέου πλαισίου λειτουργίας και πραγμάτωσης της ιατρικής εκπαίδευσης (αλλά και της υγείας γενικότερα). Θα δοθούν και θα συζητηθούν σύγχρονα παραδείγματα εφαρμογών τόσο ως προς την αναζήτηση και εύρεση των ψηφιακών εκπαιδευτικών αντικειμένων/πόρων, όσο και σύγχρονων μορφών πολυμεσικού υλικού που αλλάζουν τον τρόπο διδασκαλίας και διευκολύνουν αφάνταστα την προσέγγιση με βάση το πρόβλημα, που τόσο έχει φανεί να ικανοποιεί τις σύγχρονες εκπαιδευτικές ανάγκες του χώρου της υγείας. Θα εξεταστούν τέλος και πρότυπα ψηφιακής ιατρικής εκπαίδευσης που υλοποιούν τους παραπάνω στόχους.

    Short Bio:
    Ο Παναγιώτης Δ. Μπαμίδης, είναι Επίκ. Καθηγητής στο Εργαστήριο Ιατρικής Πληροφορικής της Ιατρικής Σχολής του Α.Π.Θ. και μέλος του Γραφείου Ιατρικής Εκπαίδευσης της Ιατρικής. Έχει διεξάγει έρευνα στο Weizmann Institute of Science (Ισραήλ), Research Centre Juelich (Γερμανία), University of Newcastle, University of Sheffield και Ανοικτό Πανεπιστήμιο (Αγγλία), ενώ έχει διδάξει σε διάφορα Πανεπιστήμια στην Ελλάδα τόσο σε προπτυχιακό όσο και σε μεταπτυχιακό επίπεδο. Έχει την επιστημονική ευθύνη 11 ερευνητικών προγραμμάτων, συντονίζει 2 από αυτά σε πανευρωπαϊκό επίπεδο, ενώ έχει λάβει μέρος σε διάφορα άλλα ερευνητικά προγράμματα τόσο Εθνικά όσο και Ευρωπαϊκά. Διετέλεσε πρόεδρος των Διεθνών Συνεδρίων SAN2011, MEDICON2010, 6th GASMA/IAA 2010, iSHIMR2005, iSHIMR2001, ενώ έχει διοργανώσει μια σειρά ημερίδων στα πλαίσια διεθνών συνεδρίων και προγραμμάτων. Τα ερευνητικά του ενδιαφέροντα βρίσκονται στην ιατρική πληροφορική και ειδικότερα τις εφαρμογές της στην ιατρική εκπαίδευση, στη διαχείριση της ιατρικής πληροφορίας και την οργάνωση/διασύνδεση των υπηρεσιών υγείας, στη διασύνδεση ανθρώπου-μηχανής και τη μελέτη του συναισθήματος μέσα από την εφαρμοσμένη νευροεπιστήμη, στην υποστήριξη και εκπαίδευση ατόμων/ομάδων με ειδικές ανάγκες, όπως και στην ανάλυση βιο-σημάτων και ανάπτυξη βιο-αισθητήρων. Έχει δημοσιεύσει πάνω από 130 εργασίες σε περιοδικά και πρακτικά συνεδρίων, ενώ είναι κριτής σε 12 περιοδικά και διετέλεσε χρέη Guest Editor σε 5 ειδικές εκδόσεις (special issues) μερικών από αυτά. Είναι τέλος μέλος διαφόρων επιστημονικών επιτροπών και αναπληρωματικό μέλος του ΔΣ της Αλεξάνδρειας Ζώνης Καινοτομίας της Θεσσαλονίκης. Το Νοέμβριο του 2009 τιμήθηκε με το Βραβείο Αριστείας του Α.Π.Θ, για την ερευνητική του δραστηριότητα ως μέλος ΔΕΠ-νέος ερευνητής σε χρηματοδοτούμενα έργα.

    Note:
    1) The talk will be in Greek. 2) The presenter will also provide the following series of talks (Mon, Nov 7, 2011, 18:00-21:00 and Friday, Nov 11, 18:00-19:00): "Οι σύγχρονες εξελίξεις τεχνολογιών διαδικτύου (συστήματα, εργαλεία, μέσα) και η εφαρμογή τους στην Ιατρική Εκπαίδευση". Please contact cs-AT-cs.ucy.ac.cy or 22-892700 for additional details.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Body Representation in Immersive Virtual Reality, Prof. Mel Slater (University of Barcelona, Spain and UCL, UK), Monday, Oct 3, 2011, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Body Representation in Immersive Virtual Reality

    Speaker: Prof. Mel Slater
    Affiliation: University of Barcelona, Spain and UCL, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, Oct 3, 2011
    Time: 11:00-12:00 EET
    Host: Yiorgos Chrysanthou (yiorgos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.slater

    Abstract:
    Computer programs can be written that digitally represent and simulate physical spaces and events. Immersive virtual reality systems provide a medium whereby the digital representation can be transformed into a stream of sense data (visual, auditory, haptic) that is displayed to people, and with which people can interact via body tracking systems. Typically virtual reality has been thought of as a way to place people inside representations of such simulations, where they have the feeling of being in the virtual place, and can carry out actions, and respond to events there. However, it is becoming clear that virtual reality can be used in a way that has hardly been explored up to now - not only can the sense of place be transformed, but also aspects of the sense of oneself, in particular the appearance of the body. In this talk we will describe several experiments that show that virtual reality is a very powerful technology for body substitution, that is giving people the strong feeling that their body has been replaced by a virtual body. This opens up the door for interesting new exploitation of this technology for many applications, as well as for the basic science of understanding how the brain represents the body.

    Short Bio:
    Mel Slater is an ICREA Research Professor at the University of Barcelona, Spain and Prof. of Virtual Environments at UCL where he maintains a small group of researchers. He founded the Virtual Environments and Computer Graphics research group in the Department of Computer Science at UCL and obtained two rounds of funding to install the virtual reality Cave system. He was a UK EPSRC Senior Research Fellow from 1999 to 2004. Twenty six of his PhD students have obtained their PhDs since 1989. In 2005 he was awarded the Virtual Reality Career Award by IEEE Virtual Reality ‘In Recognition of Seminal Achievements in Engineering Virtual Reality.’ He leads the eventLab at UB. He holds a European Research Council grant TRAVERSE on the specific topic virtual embodiment, and the general topic of a new area of application of virtual reality based on this theme.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Electronic Health: Myth or Reality, Prof. Dimitrios Koutsouris (National Technical University of Athens, Greece), Wednesday, Sep 28, 2011, 14:00-15:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Electronic Health: Myth or Reality

    Speaker: Prof. Dimitrios Koutsouris
    Affiliation: National Technical University of Athens, Greece
    Category: Colloquium
    Location: Room 147, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, Sep 28, 2011
    Time: 14:00-15:00 EET
    Host: Christos Schizas (schizas AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.koutsouris

    Abstract:
    (in Greek) Επισκόπηση βασικών τεχνολογιών πληροφορικής και τηλεπικοινωνιών που χρησιμοποιούνται στο χώρο της υγείας. Ανάλυση γενικών υποδομών που χρησιμοποιούνται στην ιατρική πληροφορική όπως δίκτυα επικοινωνία, υπολογιστικές συσκευές, διατάξεις ταυτοποίησης, πρότυπα, διαγνωστικές συσκευές, συσκευές ιατρικής υποστήριξης, ανάπτυξη συστημάτων λογισμικού όπως λογισμικό παρακολούθησης ιατρικών σημάτων, λογισμικό υποστήριξης αποφάσεων, διαχειριστικό λογισμικό, λογισμικό ανάλυσης. Τεχνολογίες και υποδομές τηλεϊατρικής, όπως δίκτυα NGN, δίκτυα ADSL, δίκτυα ATM, GSM, GPRS και άλλα, χρήση ασυρμάτων προσωπικών δικτύων όπως Bluetooth IEEE 802.15.4, ασύρματα δίκτυα αισθητήρων, εφαρμογές τηλεϊατρικής, ρομποτική ιατρική, κ.α. Πληροφοριακά συστήματα υγείας και εφαρμογές τους, όπως ηλεκτρονικές προμήθειες, ηλεκτρονικές δημοπρασίες, ηλεκτρονική συνταγογράφηση.

    Short Bio:
    O Δημήτριος Κουτσούρης είναι Καθηγητής Ιατρικής Πληροφορικής στην Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών του Εθνικού Μετσόβιου Πολυτεχνείου Αθηνών. Τα ερευνητικά ενδιαφέροντα του περιλαμβάνουν Ιατρική Πληροφορική, Τηλεματικές Εφαρμογές στην Υγεία, Βιοϊατρικές Εφαρμογές μη ιονιζουσών ακτινοβολιών, Ποιοτικός Έλεγχος και Ασφάλεια μη ιονιζουσών ακτινοβολιών, Βιορρεολογία.

    Note:
    1) The talk will be in Greek. 2) The presenter will also provide the following series of talks (Fri, Sep 30, 2011, 16:00-18:00 and Monday, Oct 3, 18:00-21:00): "1. Ηλεκτρονικές Εφαρμογές και Υπηρεσίες στην Υγεία με χρήση τεχνολογιών αιχμής Νεφουπολογιστικής". Please contact cs-AT-cs.ucy.ac.cy or 22-892700 for additional details.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Multilevel Patient Specific Artery and Atherogenesis Models, Prof. Dimitris Fotiadis (University of Ioannina, Greece), Monday, June 27, 2011, 09:30-10:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Multilevel Patient Specific Artery and Atherogenesis Models

    Speaker: Prof. Dimitris Fotiadis
    Affiliation: University of Ioannina, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, June 27, 2011
    Time: 09:30-10:30 EET
    Host: Costas Pattichis (pattichi AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.fotiadis

    Abstract:
    We present a platform for the development of multiscale cpatient specific artery and atherogenesis models. The platform, called ARTool, integrates technologies of 3D image reconstruction from various image modalities, blood flow and biological models of mass transfer, plaque characterization and plaque growth. Patient images are acquired for the development of the 3D model of the patient specific arteries. Then, blood flow is modeled within the arterial models for the calculation of the Wall Shear Stress distribution (WSS). WSS is combined with other patient specific parameters for the development of the plaque progression models. Real time simulation can be performed for same cases in grid environment. The platform is evaluated using both animal and human data.

    Short Bio:
    Dimitrios I. Fotiadis was born in Ioannina, Greece, in 1961. He received the Diploma degree in Chemical Engineering from the Department of Chemical Engineering, National Technical University of Athens, Athens, Greece in 1985 and the Ph.D. degree in Chemical Materials Science from the University of Minnesota, Twin Cities, Minneapolis, USA in 1990. Currently, he is a Professor of Biomedical Engineering at the Department of Materials Science and Engineering, University of Ioannina, Greece, he is the director of the Unit of Medical Technology and Intelligent Information Systems, Department of Materials Science and Engineering. He has published more than 140 papers in scientific journals, 300 papers in peer-reviewed conference proceedings, more than 30 chapters in books and he is the editor of 16 books. His research interests include modelling of human tissues and organs, intelligent wearable devices for automated diagnosis and bioinformatics.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Stepwise kNN Search on Vertically Stored Time Series, Dr. Panagiotis Karras (National University of Singapore, Singapore), Friday, June 24, 2011, 12:00-13:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Stepwise kNN Search on Vertically Stored Time Series

    Speaker: Dr. Panagiotis Karras
    Affiliation: National University of Singapore, Singapore
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, June 24, 2011
    Time: 12:00-13:00 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.karras

    Abstract:
    Nearest-neighbor search over time series has received vast research attention as a basic data mining task. Still, node of the hitherto proposed methods scales well with increasing time series length. This is due to the fact that all methods encounter the curse of dimensionality. In particular, traditional methods utilize an index to search in a reduced-dimensionality feature space; however, for high timeseries length, search with such an index yields many false hits that need to be eliminated by accessing the full records. An attempt to reduce false hits by indexing more features exacerbates the curse of dimensionality, and vice versa. A recently proposed alternative, iSAX, uses symbolic approximate representations accessed by a simple file-system directory as an index. Still, iSAX also encounters false hits, which are again eliminated by accessing records in full: once a false hit is generated by the index, there is no second chance to prune it; thus, the pruning capacity iSAX provides is also one-off. This paper proposes an alternative approach to time series kNN search, following a nontraditional pruning style. Instead of navigating through candidate records via an index, we access their features, obtained by a multi-resolution transform, in a stepwise sequential-scan manner, one level of resolution at a time, over a vertical representation. Most candidates are progressively eliminated after a few of their terms are accessed, using pre-computed information and a tight double-bounding scheme (i.e., not only lower, but also upper distance bounds). Our experimental study with large-scale long time-series data confirms the advantage of our approach over both the current state-of-the-art method, iSAX, and classical index-based methods.

    Short Bio:
    Panagiotis Karras is an LKY Postdoctoral Fellow at the National University of Singapore. He earned a Ph.D. in Computer Science from the University of Hong Kong and an M.Eng. in Electrical and Computer Engineering from the National Technical University of Athens. In 2008, he received the Hong Kong Young Scientist Award. He has also held positions at the University of Zurich and the Technical University of Denmark. His research interests are in data mining, algorithms, data streams, spatial data management, anonymization, indexing, and similarity search. His work has been published in major database and data mining conferences and journals.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Network Mobility for Ubiquitous Connectivity, Prof. Mohammed Atiquzzaman (University of Oklahoma, USA), Friday, June 3, 2011, 12:00-13:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Network Mobility for Ubiquitous Connectivity

    Speaker: Prof. Mohammed Atiquzzaman
    Affiliation: University of Oklahoma, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, June 3, 2011
    Time: 12:00-13:00 EET
    Host: George Samaras (cssamara AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.atiquzzaman

    Abstract:
    Previous work on mobility management in data networks have mainly dealt with solutions regarding mobility of individual hosts. Various networks layer and transport layer solutions have been developed. However, recently there has been strong interest in finding solutions for networks in motion, such as networks in an aircraft, train or ship to allow ubiquitous connectivity. As they move, rather than handing off individual hosts on such a network, it is more efficient to handover the networks between access points. This results in the handoff being transparent to the hosts and less control traffic in the resource challenged wireless networks. The talk with provide an overview of the network layer based solution being developed by the Internet Engineering Task Force and compare with the end-to-end based solution (SINEMO) being developed at University of Oklahoma in conjunction with the National Aeronautics and Space Administration for on networks in motion. The application of networks in motion will be illustrated for both terrestrial and space environment.

    Short Bio:
    Mohammed Atiquzzaman (Senior Member, IEEE) obtained his M.S. and Ph.D. in Electrical Engineering and Electronics from the University of Manchester (UK) in 1984 and 1987, respectively. He joined as an assistant professor in 1987 and was later promoted to senior lecturer and associate professor in 1995 and 1997, respectively. Since 2003, he has been a professor in the School of Computer Science at the University of Oklahoma. His current research interests are in areas of transport protocols, wireless and mobile networks, ad hoc networks, satellite networks, Quality of Service, and optical communications. His research has been funded by National Science Foundation (NSF), National Aeronautics and Space Administration (NASA), and U.S. Air Force. He is the co-author of the book “Performance of TCP/IP over ATM networks” and has over 250 refereed publications, most of which can be accessed at www.cs.ou.edu/~atiq.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Mobility Management and Performance Control in Wireless Networks, Dr. Vasos Vassiliou (University of Cyprus, Cyprus), Thursday, June 2, 2011, 10:00-11:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Mobility Management and Performance Control in Wireless Networks

    Speaker: Dr. Vasos Vassiliou
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, June 2, 2011
    Time: 10:00-11:00 EET
    Host: George Samaras (cssamara AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.vassiliou

    Abstract:
    Currently we are witnessing an explosive growth in the use of mobile phones, not only for conventional speech communications, but increasingly in remotely accessing data and global networks such as the Internet. As computer and telecommunications technologies advance and converge, the demand of developed societies for prompt and reliable information transfer and exchange vastly increases as well. Wireless communications offer highly effective solutions for instant access to information, especially for mobile users. The momentum toward using a plethora of multimedia forms (voice, video, and data applications) is also creating new realities. To cope with these new realities we have to provide for management solutions for the user mobility and the support of their quality of experience (QoE). Over the last few years there were many efforts to support the applications described above in next generation IP-based mobile wireless networks. This talk will initially present a line of research that addresses mobility and Quality of Service (QoS) management in mobile wireless networks. We start with the introduction of Mobile IPv6 concepts in Virtual Circuit-based networks (namely: MPLS) and the use of QoS adaptation to cope with changes in such environments and continue with the problem of correctly characterizing Mobile IPv6 handovers, by providing a detailed description of handover latency components. The talk will also present our current activities towards mobility support and performance control in Wireless Sensor Networks.

    Short Bio:
    Dr. Vasos Vassiliou is Lecturer at the Department of Computer Science of the University of Cyprus. He completed his undergraduate studies at the Higher Technical Institute (H.N.D in Electrical Engineering, 1993) and the University of South Florida (B.Sc. in Electrical Engineering, 1997) and his postgraduate studies at the Georgia Institute of Technology (M.Sc. in Electrical and Computer Engineering, 1999, Ph.D. in Electrical and Computer Engineering, 2002). Before joining the Department of Computer Science of the University of Cyprus he held positions as a Visiting Lecturer at the same department (2004-2005) and as an Assistant Professor at the Computer Science Department of Intercollege (2002-2004). His research interests lie in the area of Protocol Design and Performance Control aspects of Networks, and in particular in Mobility Management, QoS Adaptation and Control, Next Generation Network Architectures, and Resource Allocation and Management Techniques.

    Note:
    This colloquium is part of the speaker's procedure for evaluation and promotion from Lecturer to Assistant Professor.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Lowering the barrier of entry to Federated Computing Infrastructures: Grids as Information Platforms, Dr. Marios D. Dikaiakos (University of Cyprus, Cyprus), Monday, May 16, 2011, 09:30-10:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Lowering the barrier of entry to Federated Computing Infrastructures: Grids as Information Platforms

    Speaker: Dr. Marios D. Dikaiakos
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, May 16, 2011
    Time: 09:30-10:30 EET
    Host: Christos Schizas (schizas AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.dikaiakos

    Abstract:
    Driven by the vision of e-Science - the new paradigm of IT-centric scientific exploration - and by continuous advances in computing, data storage and networking technologies, a large number of research and development projects were undertaken during the last decade, striving to develop, deploy, and demonstrate large-scale, geographically distributed, federated computing systems. After a decade of developments in all aspects of Grid Computing, several large-scale Grid infrastructures are in operation around the world, providing production-quality computing and storage services to many thousands of users from a wide range of scientific and business fields. One of the main goals of Grids has been to make their resources and services easily accessible and attractive. Nonetheless, the number of Grid users has not reached initial projections, and Grid infrastructures are criticized for shortcomings in reliability, user-friendliness and for the complexity of their middleware, application development and operational environments. One of the key challenges for enhancing Grid usability is the lack of tools that could help users discover, explore, exploit, and share information regarding the characteristics, the capabilities and the state of computing resources, services, applications, stored data-sets, etc. The development of such tools requires: a) the collection, maintenance, integration and indexing of state information and metadata that are produced and maintained by different middleware subsystems, in different forms (structured, unstructured, semi-structured) and with varying degrees of dynamism; b) the development of mechanisms for exposing access to such metadata through user-friendly interaction paradigms that contributed to the success of the Web, namely browser-enabled navigation and keyword search; and c) the implementation of higher level abstractions that hide the inherent complexity of Grid subsystems without narrowing the functionalities provided by the Grid middleware. In this talk, we present an overview of research efforts in a number of problems targeting these challenges and involving the development of, and experimentation with novel, user-centered software systems and tools. In particular, we describe: a) the development of experiences with developing a semantic Grid Information Service that exploits Ontologies and Semantic Web technologies to provide integrative search capabilities for Grid-related information; b) the design and implementation of a keyword-based software search engine for software deployed on Grid and Cloud infrastructures; c) the development of user-oriented systems and tools that support the selection of Grid resources based on performance or reliability requirements. Finally, we present the engineering of a software environment that provides end-users, application developers and Grid administrators with a common set of middleware-independent abstractions for accessing the Grid through advanced graphical interaction paradigms.

    Short Bio:
    Marios D. Dikaiakos is Associate Professor of Computer Science at the University of Cyprus. Dikaiakos received his Ph.D. and M.A. degrees in Computer Science from Princeton University (1994 and 1991) and a Dipl.-Ing. degree from the National Technical University of Athens (summa cum laude, 1988). He has also worked at the University of Washington in Seattle (1994-1995) and has held short-term visiting positions in Rutgers University and the University of Crete. Dr. Dikaiakos is a senior member of the ACM.

    Note:
    This colloquium is part of the speaker's procedure for evaluation and promotion from Associate Professor to Professor.

    Web: http://www.cs.ucy.ac.cy/colloquium/
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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Virtual Localisation for Robust Geographic Routing in Wireless Sensor Networks, Dr. Ahmet Sekercioglu (Monash University, Australia), Thursday, May 5, 2011, 12:00-13:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Virtual Localisation for Robust Geographic Routing in Wireless Sensor Networks

    Speaker: Dr. Ahmet Sekercioglu
    Affiliation: Monash University, Australia
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, May 5, 2011
    Time: 12:00-13:00 EET
    Host: Andreas Pitsillides (Andreas.Pitsillides AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.sekercioglu

    Abstract:
    Geographic routing protocols are well suited to wireless sensor networks because of their modest resource requirements A major limiting factor in their implementation is the requirement of location information. The virtual localisation algorithm provides the functionality of geographic routing without any knowledge of node locations by constructing a virtual coordinate system. It differs from similar algorithms by improving efficiency – greedy routing performs significantly better over virtual locations than over physical locations. The algorithm was tested and evaluated in a real network environment.

    Short Bio:
    Dr. Ahmet Sekercioglu is a member of the academic staff at the Department of Electrical and Computer Systems Engineering of Monash University, Melbourne, Australia. He was the leader of the Applications Program of Australian Telecommunications CRC until the completion of the centre's research activities (December 2007). He has completed his PhD degree at Swinburne University of Technology, BSc and MSc degrees (all in Electrical and Electronics Engineering) at Middle East Technical University, Ankara, Turkey. He lectured at Swinburne University of Technology, Melbourne, Australia for 8 years. Prior to his academic career, he held numerous positions as a research engineer in private industry. He has published 14 journal articles, 2 book chapters, 56 conference papers and has filed 2 patents. His recent research is in distributed algorithms for self-organization in wireless networks. He is also working in the application of intelligent control techniques for multiservice networks as complex, distributed systems. His e-mail address is ASekerci@ieee.org and his Web site can be found at http://titania.ctie.monash.edu.au.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Digital Microfluidic Biochips: A Vision for Cyberphysical Systems, Functional Diversity and More than Moore, Prof. Krishnendu (Krish) Chakrabarty (Duke University, USA), Wednesday, May 4, 2011, 16:00-17:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Digital Microfluidic Biochips: A Vision for Cyberphysical Systems, Functional Diversity and More than Moore

    Speaker: Prof. Krishnendu (Krish) Chakrabarty
    Affiliation: Duke University, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, May 4, 2011
    Time: 16:00-17:00 EET
    Host: Theocharis Theocharides (ttheocharides AT ucy.ac.cy) and Costas Pattichis (pattichi AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.chakrabarty

    Abstract:
    Microfluidics-based biochips (or lab-on-chip) are revolutionizing laboratory procedures, and leading to a convergence of information technology with biochemistry and microelectronics. Advances in microfluidics technology offer exciting possibilities for high-throughput DNA sequencing, drug discovery, immunoassays, neo-natal and point-of-care clinical diagnostics, etc. As microfluidic lab-on-chip mature into multifunctional devices with "smart" reconfiguration and adaptation capabilities, automated design and ease of use become extremely important. Computer-aided design (CAD) tools are needed to allow designers and users to harness the new technology that is rapidly emerging for integrated biofluidics. This talk will present research at Duke University on design automation and software control for microfluidic biochips. First, the speaker will provide an overview of electrowetting-based digital microfluidic biochips. Next, the speaker will describe synthesis methods that can map bioassay protocols to a reconfigurable microfluidic device and generate an optimized schedule of bioassay operations, the binding of assay operations to functional units, and the layout and droplet flow-paths for the biochip. Techniques for pin-constrained chip design, fault detection, and dynamic reconfiguration will also be presented. Finally, future directions involving a cyberphysical systems perspective will be highlighted.

    Short Bio:
    Krish Chakrabarty is a Professor of Electrical and Computer Engineering at Duke University. His current research is focused on design and test of system-on-chip integrated circuits, microfluidics-based biochips (digital microfluidics, microelectrofluidics), and wireless/sensor networks. Research support is provided by the National Science Foundation, the Semiconductor Research Corporation, Cisco Systems, HP Labs, Intel Corporation (equipment grant), and the National Institutes of Health (STTR Phase II subcontract from Advanced Liquid Logic). Other sponsors in the recent past have included DARPA and the Office of Naval Research. Prof. Chakrabarty is a Fellow of IEEE, a Golden Core Member of the IEEE Computer Society, a Distinguished Engineer of ACM, a member of SIGDA, and a member of Sigma Xi. He is also an Invitational Fellow of the Japan Society for the Promotion of Science (JSPS), 2009. He is a recipient of the IEEE Computer Society Meritorious Service Award. Prof. Chakrabarty is a Chair Professor (Member of the Chair Professor Group in Software Theory) in the School of Software in Tsinghua University, Beijing, China.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Equation Discovery for Ecology and Systems Biology, Dr. Saso Dzeroski (Jozef Stefan Institute, Slovenia), Monday, May 2, 2011, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Equation Discovery for Ecology and Systems Biology

    Speaker: Dr. Saso Dzeroski
    Affiliation: Jozef Stefan Institute, Slovenia
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, May 2, 2011
    Time: 15:00-16:00 EET
    Host: Antonis Kakas (kakas AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.dzeroski

    Abstract:
    The discovery of differential equations from measured data has been studied in the area of machine learning under the topic of computational scientific discovery, and more specifically equation discovery, for almost two decades. The talk will describe state-of-the-art methods for discovering differential equations from measured data and domain knowledge. It will then discuss several applications in the area of ecology (modelling aquatic ecosystems) and systems biology (modelling endosome maturation).

    Short Bio:
    Saso Dzeroski is a scientific councillor at the Jozef Stefan Institute and the Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins, both in Ljubljana, Slovenia. He is also a professor at the Jozef Stefan International Postgraduate School. His research is mainly in the area of machine learning and data mining (constraint-based data mining, data mining query languages, inductive logic programming, inductive databases, relational data mining, and equation discovery) and their applications (mainly in environmental and life sciences). He has participated in many international research projects (mostly EU-funded) and coordinated two of them. He has organized many scientific events, including the International Conference on Machine Learning and two recent workshops on Machine Learning in Systems Biology, and is currently serving on the editorial boards of six journals. He is co-author/co-editor of more than ten books/volumes, the latest two of which are »Computational Discovery of Scientific Knowledge« (2007) and »Inductive Databases and Constraint-Based Data Mining« (2010).

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Java MapReduce on Multi-Cores, Dr. Mikel Lujan (University of Manchester, UK), Friday, 29 April 2011, 11:30-12:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Java MapReduce on Multi-Cores

    Speaker: Dr. Mikel Lujan
    Affiliation: University of Manchester, UK
    Category: Colloquium
    Location: Room 148, Building 12, Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, 29 April 2011
    Time: 11:30-12:30 EET
    Host: Pedro Trancoso (pedro AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.lujan

    Abstract:
    MapReduce has been widely accepted as a simple programming pattern that can form the basis for efficient, large-scale, distributed data processing. The success of the MapReduce pattern has led to a variety of implementations for different computational scenarios. In this talk we present MRJ, a MapReduce Java framework for multi-core architectures. We evaluate its scalability and investigate the significant impact that Java runtime garbage collection has on the performance and scalability of MRJ. We propose the use of memory management autotuning techniques based on machine learning. With our auto-tuning approach, we are able to achieve MRJ performance within 10% of optimal on 75% of our benchmark tests.

    Short Bio:
    Dr Mikel Lujan is a Royal Society University Research Fellow at the University of Manchester investigating how to co-design future many-core architectures and managed virtual execution environments. Previously, he worked in Sun Microsystems Laboratories in California as part of the Phase II of the High Productivity Computer Systems project. He holds PhD (University of Manchester, 2002), MPhil (University of Manchester 1999), and MEng (University of the Basque Country, 1998) degrees in Computer Science.

    Web: http://www.cs.ucy.ac.cy/colloquium/
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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Cost-aware Data Management in the Cloud, Dr. Verena Kantere (Cyprus University of Technology, Cyprus), Thursday, April 7, 2011, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Cost-aware Data Management in the Cloud

    Speaker: Dr. Verena Kantere
    Affiliation: Cyprus University of Technology, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, April 7, 2011
    Time: 11:00-12:00 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.kantere

    Abstract:
    The term ‘cloud computing’ is nowadays synonymous to computing services offered by large-scale infrastructures. The key to the success of cloud computing is to provide seamless and efficient management of large dynamic disseminated data collections, such as scientific data, in order to maximize their availability while minimizing capital expenditure. This talk leverages lessons learned from financial management to solve the problem of both cost- and time-efficient management on clouds offering online data services. We propose a novel economy model for a cloud where users pay on-the-go for the data services they receive and user payments can be used for service provision, infrastructure maintenance and profit. The economy employs a cost model that takes into account all the available resources in a cloud, such as disk space and I/O operations, CPU time and network bandwidth. In order to ensure the economic viability of the cloud, the cost of offering new services has to be amortized to prospective users that will use them. We propose a novel cost amortization model that predicts the extent of amortization in time and number of users. The economy is completed with a dynamic pricing scheme that achieves optimal cloud profit while ensuring user satisfaction with service prices. The talk concludes with future research directions on the provision of online data services.

    Short Bio:
    Verena Kantere is a tenure-track lecturer at the Department of Electrical Engineering and Information Technology at the Cyprus University of Technology. She has received a Diploma (2000) and a Ph.D. (2007) from the National Techincal University of Athens, (NTUA) and a M.Sc. degree from the Department of Computer Science at the University of Toronto (2003). During her graduate studies her research interests focused on problems of data exchange and coordination in Peer-to-Peer (P2P) overlays with structured and unstructured data, as well as multidimensional data sharing. She has proposed frameworks and techniques that deal with the heterogeneity problem, query processing and rewriting, as well as managing continuous queries. Furthermore, she has shown interest and work in the field of Semantic Web, concerning the problem of semantic similarity, annotation, clustering and integration. After the completion of her PhD studies and until recently, she worked as a postdoctoral researcher (2008-2010) at the Ecole Polytechnique Federale de Lausanne (EPFL). Her research focuses on the provision of cloud data services, focusing on the special needs of large analytical data, such as scientific data. She is working towards the incorporation of cost in existing and new data management techniques and has designed a novel data-aware economy model for cloud data services.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Learning in a Partially Observable World, Dr. Loizos Michael (Open University of Cyprus, Cyprus), Monday, April 4, 2011, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Learning in a Partially Observable World

    Speaker: Dr. Loizos Michael
    Affiliation: Open University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, April 4, 2011
    Time: 11:00-12:00 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.michael

    Abstract:
    Agents sensing their environment obtain information that is often incomplete in some shape or form. Examples abound: (1) certain tests may be too expensive to perform to complete a patient's medical record; (2) responders to a market survey may choose not to reveal certain information about themselves; (3) the author of a piece of text may choose not to explicitly state information that she believes can be inferred by the readers; (4) a packet may be routed through a private network and that route segment may not be tracked; (5) a dynamic system may transition through certain states too quickly to be monitored; (6) a user's preferences in support of a decision may be kept secret for privacy reasons. From a learning point of view, the challenge is to design algorithms that deal with incomplete information in a principled manner. We shall consider two broad settings: The static setting (examples 1-3) builds upon typical supervised learning scenarios, where, however, attributes are hidden in arbitrary ways. The dynamic setting (examples 4-6) deals with scenarios where an initial and a final state of a process are observed, while the intermediate states remain hidden. We shall discuss conditions under which algorithms are known to exist in these settings and can be shown to be efficient, be accompanied by predictive guarantees, and make limited assumptions on how information is hidden.

    Short Bio:
    Loizos Michael is a Lecturer in Information Systems at Open University of Cyprus (since 2009). Before joining OUC he held a Visiting Lecturer position at University of Cyprus (2008-2009). He was educated at University of Cyprus, where he received a B.Sc. in Computer Science with a minor degree in Mathematics (2002). He continued his education at Harvard University, where he received an M.Sc. and a Ph.D. in Computer Science (2003 and 2008, respectively). His research focuses on the formal and principled understanding of cognitive processes such as learning and reasoning, and how those are employed by humans and other biological organisms in their everyday lives. Specific areas of interest include: commonsense reasoning, temporal and default reasoning, computational learning theory, computational evolution theory, text and narrative understanding, nature-inspired computation, distributed computation, and game theory.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Challenges in Business Analytics and Optimization; an Industrial Research Perspective, Dr. Eleni Pratsini (IBM Research Zurich, Switzerland), Thursday, March 31, 2011, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Challenges in Business Analytics and Optimization; an Industrial Research Perspective

    Speaker: Dr. Eleni Pratsini
    Affiliation: IBM Research Zurich, Switzerland
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, March 31, 2011
    Time: 15:00-16:00 EET
    Host: Marios D. Dikaiakos (mdd AT cs.ucy.ac.cy) and Hercules Vladimirou (hercules AT ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.pratsini

    Abstract:
    The Mathematical Sciences group at IBM Research is involved in a number of internal and client external projects. In this presentation we will present some of these projects and describe the challenges and issues we encounter in an environment where information technology becomes more prevalent. With the greater availability of data and the sophistication of clients, there is a growing need to tackle aspects not only from a mathematical perspective, but also from a computer science perspective. Our analysis must now consider aspects of data models, software architecture, data security, dynamic learning, just to name a few. Our optimization models need to take advantage of this abundance of data, incorporate stochastic aspects, be adaptive and dynamic and deal with data uncertainty. An example from the pharmaceutical industry will be used to bring up some of these challenges as they apply to supply chain planning under quality and regulatory risk.

    Short Bio:
    Eleni Pratsini is Head of the Department of Mathematical and Computational Sciences at IBM Research - Zurich. She holds a B.Sc. in Civil Engineering (U. Birmingham), an M.B.A (UCLA), and a Ph.D. in Quantitative Analysis (U. Cincinnati). After her Ph.D., she was an Assistant and then Associate Professor of Decision Sciences at Miami University, where she taught courses in Operations Research and the Executive MBA program. Her research in production, applied statistics and environmental analysis led to numerous refereed scientific publications and presentations at professional meetings.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Men and Mice in Motion - Some Examples of Image Analysis Methods in Medicine, Prof. Tomas Gustavsson (Chalmers University of Technology, Sweden), Tuesday, March 15, 2011, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Men and Mice in Motion - Some Examples of Image Analysis Methods in Medicine

    Speaker: Prof. Tomas Gustavsson
    Affiliation: Chalmers University of Technology, Sweden
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, March 15, 2011
    Time: 15:00-16:00 EET
    Host: Costas Pattichis (pattichi AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.gustavsson

    Abstract:
    This talk presents some examples of advanced image analysis methods with applications to cardiovascular- and cellular research. Dynamic programming is being used for 2D spatial boundary detection in ultrasound carotid artery images. Furthermore, an extension to 3D (space + time) is given. Hidden Markov Modelling is applied for modelling stem cell motion pattern in light microscopy. Finally, it is shown how these and other image analysis methods can be applied in a murder trial.

    Short Bio:
    Tomas Gustavsson received the M.Sc. and Ph.D. degrees in Electrical and Computer Engineering from Chalmers University of Technology, Göteborg, Sweden. In 1991, Gustavsson spent a Post Doc at the Medical Research Council, Edinburgh, UK, carrying out research on automated cytogenetics. In 2003, he spent a sabbatical in the US collaborating with the Texas Heart Institute and Rice University, Houston Texas. Since 1997, Gustavsson is acting as a Professor in the Department of Signals and Systems, Chalmers University of Technology.Gustavsson is active in the field of bioimaging and image analysis. In close collaboration with biologists (in the cardiovascular, neuro and cellular fields) he is responsible for developing imaging platforms and image analysis (pattern recognition) software algorithms. Gustavsson is the founder and Director of Image and Data Analysis, a company providing quantitative ultrasonic image analysis software with applications to basic science, clinical diagnostics, and drug trials. This software is being used in numerous collaborative projects running at leading US Universities such as Johns Hopkins/Baltimore, Harvard/Boston, Cornell/ New York, New York University Medical School, Yale, and many others.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: WCET Analysis of Tasks Executed on Multicore Architectures with Shared Caches, Dr. Damien Hardy (IRISA & University of Rennes, France), Monday, February 28, 2011, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    WCET Analysis of Tasks Executed on Multicore Architectures with Shared Caches

    Speaker: Dr. Damien Hardy
    Affiliation: IRISA & University of Rennes, France
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, February 28, 2011
    Time: 11:00-12:00 EET
    Host: Yanos Sazeides (yanos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.hardy

    Abstract:
    Hard real-time systems are subject to timing constraints and failure to respect them can cause economic, ecological or human disasters. The validation process, which guarantees the safety of such software, is based on the knowledge of the worst-case execution time (WCET) of each task. Determining the WCET is a difficult problem for modern architectures because of complex hardware mechanisms, such as bus and shared caches, which cause significant execution time variability. In this talk, we present a static analysis of the worst-case timing behavior of tasks running on multicore processors with a cache hierarchy in which some cache levels are shared among cores. We will first introduce existing static analyses of cache hierarchies for single-core processors. Then, we will see how to integrate the notion of inter-task conflicts occuring in shared cache levels present in multicore processors and, how to tighten WCET estimations by reducing this kind of conflicts by using a compiler directed bypass scheme. Experimental results show that our approach allows to drastically reduce the WCET of tasks compared to methods which consider all inter-task conflicts and do not attempt to reduce their amount.

    Short Bio:
    Damien Hardy is a temporary teaching and research associate at the University of Rennes, France. He received his PhD degree in computer science from the University of Rennes in 2010. His research interests include real-time systems, compilers, and computer architecture. His current research focuses on timing analysis of real-time software, more precisely on static worst-case execution time prediction for modern hardware used in embedded systems with particular emphasis on the memory hierarchy.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Formally Modelling and Analyzing Timed and Distributed Systems, Dr. Anna Philippou (University of Cyprus, Cyprus), Tuesday, March 1, 2011, 09:00-10:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Formally Modelling and Analyzing Timed and Distributed Systems

    Speaker: Dr. Anna Philippou
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, March 1, 2011
    Time: 09:00-10:00 EET
    Host: Andreas Pitsillides (Andreas.Pitsillides AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.philippou

    Abstract:
    Distributed and embedded systems present today one of the most challenging areas of research in computer science. Their high complexity, dynamic nature and features such as mobility, fault tolerance, timing and resource requirements, render their construction, description and analysis a challenging task. The development of formal frameworks for describing and associated methodologies for reasoning about such systems has been an active area of research for the last few decades. Process calculi are one such formalism. In this talk we will present two approaches based on process calculus for reasoning about system behavior. The first concerns a framework for describing and reasoning about real-time, resource-constrained systems. Methodologies for analyzing the correctness of systems will be presented as well as case studies relating to protocol verification and scheduling analysis. We will then extend the formalism to capture resource demand and supply and we will develop a compositional methodology for hierarchical scheduling of real-time components. In our second framework, we will consider the field of mobile ad hoc networks and we will attempt to distill appropriate constructs for describing and reasoning about networks which communicate through broadcast communication and whose topology evolves as computation proceeds. We will develop confluence-based techniques for facilitating system analysis and we will illustrate the applicability of the approach via case studies. The talk will conclude with an overview of results stemming from Algorithmic Game Theory relating to the problems of network security and network routing.

    Short Bio:
    Anna Philippou is an Assistant Professor at the Department of Computer Science of the University of Cyprus. She completed her undergraduate studies at the University of Oxford, (B.A. in Mathematics and Computation, 1992) and her postgraduate studies at the University of Warwick (M.Sc. in Parallel Computers and Computation, 1993, Ph.D. in Computer Science, 1997). Before joining the Department of Computer Science of the University of Cyprus she worked as a Teaching Assistant at the University of Warwick (1993-1996) and as a Postdoctoral Research Fellow at the University of Pennsylvania (1997-1998). Her research interests lie in the areas of Foundations of Concurrent and Distributed Computation, Formal Methods for Real-time Systems, and Algorithmic Game Theory.

    Note:
    This colloquium is part of the speaker's procedure for evaluation and promotion from Assistant Professor to Associate Professor.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Increasing Interoperability on Searching Library Collections, Prof. Sarantos Kapidakis (Ionian University, Greece), Wednesday, February 16th, 2011, 12:30-13:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Increasing Interoperability on Searching Library Collections

    Speaker: Prof. Sarantos Kapidakis
    Affiliation: Ionian University, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, February 16th, 2011
    Time: 12:30-13:30 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.kapidakis

    Abstract:
    Libraries have a strong and long tradition in interoperability, and still a lot of information is lost when library systems talk to each other, without the user realizing it. Searching on library systems follow the model of meta-searching, which involve access to sources where metadata structure and content are hidden behind query interfaces. Many of the query interfaces utilize predefined abstract Access Points for the implementation of the search services, without any further access to the underlining meta-data and query methods. The main issue when meta-searching this kind of systems is the unsupported Access Points and their consequences, either query failures or inconsistent answers. We will present the zSAPN (Z39.50 Semantic Access Point Network), a system which improves the search consistency and decreases the query failures exploiting the semantic information of the Access Points from an RDFS description.

    Short Bio:
    Sarantos Kapidakis is professor at the Department of Archives and Library Sciences, at the Ionian University, Corfu, Greece, and director of the Laboratory on Digital Libraries and Electronic Publishing. He is also a member of the Steering Committee of the National Archives of Greece. In the past, he has been employed by the National Documentation Centre, Greece, MIT, USA, the University of Crete, Greece, and the Foundation for Research and Technology – Hellas. He received a Ph.D. degree in Computer Science from Princeton University in 1990. He also holds a MSc. from Princeton University and a Diploma in Electrical Engineering from the National Technical University of Athens. As part of his research on Digital Libraries, he participated in the DELOS Network of Excellence on Digital Libraries and was the Chair of the European Conference on Digital Libraries in 2009. Sarantos Kapidakis is currently a visiting professor at the Computer Science Department of UCY.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Efficient Inter-datacenter bulk transfers or How to Book Some Terabytes on 'Red-Eye' Bandwidth, Dr. Michalis Sirivianos (Telefonica Research Barcelona, Spain), Thursday, February 3, 2011, 12:00-13:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Efficient Inter-datacenter bulk transfers or How to Book Some Terabytes on 'Red-Eye' Bandwidth

    Speaker: Dr. Michalis Sirivianos
    Affiliation: Telefonica Research Barcelona, Spain
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, February 3, 2011
    Time: 12:00-13:00 EET
    Host: George Pallis (gpallis AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.sirivianos

    Abstract:
    Large datacenter operators with sites at multiple locations dimension their key resources according to the peak demand of the geographic area that each site covers. Notably, the demand of each area is known to follow strong diurnal patterns with high peak to valley ratios that result in poor average utilization across a day. In this paper, we show how to rescue transit bandwidth across multiple datacenters by using it for non-real-time applications, such as backups, propagation of bulky updates, and migration of data that improve fault tolerance, end-user experience, and energy/personnel costs, respectively. Achieving the above is non-trivial since leftover transit bandwidth appears at different times, for different durations, and at different places in the world. For this purpose we have designed, implemented, and validated a system that employs a network of storage nodes to stitch together unutilized bandwidth, whenever and wherever it exists. Our system employs advanced store-and-forward algorithms that schedule data transfers across time and space. It uses information on the availability of leftover resources and is able to react to fluctuations and failures. We have extensively compared our system with other bulk transfer mechanisms such as direct transfer, multipath forwarding, and naive store-and-forward using both emulation and a live deployment in a real CDN. Our evaluation shows that \hermes\ outperforms all other mechanisms and can rescue up to x5 additional datacenter bandwidth thus making it a valuable tool for datacenter providers.

    Short Bio:
    Michael Sirivianos is a Jr. Researcher at Telefonica Research, Barcelona. He earned a PhD in Computer Science from Duke University in 2010. He received a B.S in Electrical and Computer Engineering from the National Technical University of Athens in 2002, and an M.S. in Computer Science from the University of California, San Diego in 2004. His research interests include introducing social trust in distributed system design, cooperative content distribution and human verifiable secure device pairing.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: The Hyperbolic Map of the Internet, Dr. Fragkiskos Papadopoulos (Cyprus University of Technology, Cyprus), Monday, Jan. 10th, 2011, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    The Hyperbolic Map of the Internet

    Speaker: Dr. Fragkiskos Papadopoulos
    Affiliation: Cyprus University of Technology, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, Jan. 10th, 2011
    Time: 11:00-12:00 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2011.papadopoulos

    Abstract:
    In this talk, we will first present a connection between hyperbolic geometry and scale-free topology of complex networks, like the Internet. We will explain why this geometry can naturally lead to the emergence of Internet-like topologies and how it can be used to facilitate maximally efficient routing in the \"dark\", where each node can successfully reach destinations without having a global view of the system. We will then proceed by mapping the real Internet to a hyperbolic space. Guided by a constructed map, we will demonstrate that Internet routing exhibits scaling properties that are theoretically close to the best possible, thus resolving serious scaling limitations that the Internet faces today. Besides this immediate practical viability, we will also explain how our network mapping method can provide a different perspective on the community structure in complex networks. Related University of California—San Diego press release: http://ucsdnews.ucsd.edu/newsrel/science/09-09NewPaths.asp

    Short Bio:
    Fragkiskos Papadopoulos will be a Lecturer of the Electrical Engineering and Information Technology department at the Cyprus University of Technology in January 2011. From September 2009 to December 2010 he was a visting Lecturer at the Department of Electrical and Computer Engineering at the University of Cyprus. He received the Diploma in Electrical and Computer Engineering from the National Technical University of Athens, Greece, in 2002. In 2004 and 2007 he received respectively the M.S. and Ph.D. degrees in Electrical Engineering from the University of Southern California, Los Angeles. During 2007-2009 he was a postdoctoral research scholar at the Cooperative Association for Internet Data Analysis (CAIDA), University of California, San Diego. As a Ph.D. student he has held internship positions at both CAIDA and AT&T Labs-Research. Fragkiskos models and analyzes the performance of a variety of networks, and designs scalable methods and algorithms to solve problems related to such systems.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Mining Compressed Web Search Usage Patterns, Dr. Michail Vlachos (IBM Research Zurich, Switzerland), Monday, November 29th, 2010, 10:30-11:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Mining Compressed Web Search Usage Patterns

    Speaker: Dr. Michail Vlachos
    Affiliation: IBM Research Zurich, Switzerland
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, November 29th, 2010
    Time: 10:30-11:30 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.vlachos

    Abstract:
    Analysis of historical search patterns holds great importance for web search engines, because it can help to better understand the users' search behavior. Capturing the user search preferences over time can provide useful insights in applications such as discovery of news events, keyword recommendation and personalized ad targeting. A major bottleneck in analyzing historical sequential data is the growing size of data repositories. Therefore, there is a need to enable search and mining operations directly on the compressed data. In this talk we will present how to facilitate efficient search over compressed sequential data, with specific focus on weblog query patterns. Our approach guarantees optimally tight distance bounds, while at the same time being efficient and lightweight. This helps drastically reduce the search time compared to previous state-of-the-art techniques. Additionally, we will explicate how to support other types of knowledge discovery operations, such as burst detection, query-by-burst and query-by-periodicity. We will demonstrate extensions and applications of the presented technique for a multitude of areas.

    Short Bio:
    Michalis Vlachos is a Research Member at IBM Zurich Research Laboratory. Previously he was with IBM Research, NY, and has also visited Microsoft Research, Seattle. Dr Vlachos’ research interests include data mining, machine learning, databases, time-series analytics and data visualization. For his contributions at IBM he has received two Research Division Awards and three Invention Plateau Awards. He holds or has applied for 15 patents.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Service Engineering for Scalable Service-based Applications, Prof. Mike Papazoglou (Tilburg University, The Netherlands), Thursday, November 18th, 2010, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Service Engineering for Scalable Service-based Applications

    Speaker: Prof. Mike Papazoglou
    Affiliation: Tilburg University, The Netherlands
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, November 18th, 2010
    Time: 11:00-12:00 EET
    Host: George Samaras (cssamara AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.papazoglou

    Abstract:
    The purpose of this talk is to report on a novel, hybrid service/cloud-engineering methodology called Cloud-enabled Service ENgineering for Scalable SErvice-based ApplicationS (or SENSES). SENSES realizes an on-demand service delivery model to guide service application developers in the development of global-reach, complex service-based applications that can be configured, deployed and operated in federated cloud computing formations. It actively supports developers in choosing and assembling functions from multiple service, platform and infrastructure providers and configures the application dynamically and optimally to address the developers operational, performance-oriented and QoS-specific application requirements. It juxtaposes these requirements with essential features of cloud implementation environments. In this way, SENSES enables the creation of a Cloud-enabled Global SOA based on architectural principles employing the cloud.

    Short Bio:
    Michael P. Papazoglou holds the chair of Computer Science and is director of the ERISS at the University of Tilburg, the Netherlands. He is also an honorary professor at the University of Trento in Italy. Prior to this he was full Professor and head of School of Information Systems at the Queensland Univ. of Technology (QUT) in Brisbane Australia (1991-1996). He also held senior academic positions at the Australian National University, University of Koblenz, Germany, Fern Universität Hagen, Germany, and was principal research scientist at the National German Research Centre for Computer Science (GMD) in St. Augustin from (1983-1989. Papazoglou has authored/edited over twenty books and approximately over a hundred and fifty scientific journal articles and refereed conference papers. His most two recent books are “e-Business: Organizational and Technical Foundations” published by J. Wiley in 2006, and “Principles and Foundations of Web Services”, published by Prentice-Hall in 2008. His research was/is funded by the European Commission, the Australian Research Council, the Japanese Society for the Promotion of Science, and Departments of Science and Technology in Europe and Australia. He is a golden core member and a distinguished visitor of the Institute of Electrical & Electronics Engineers (IEEE) Computer Science section.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Algorithmic aspects of wireless sensor networking towards the Future Internet, Dr. Sotiris Nikoletseas (University of Patras, Greece), Wednesday, November 10th, 2010, 16:00-17:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Algorithmic aspects of wireless sensor networking towards the Future Internet

    Speaker: Dr. Sotiris Nikoletseas
    Affiliation: University of Patras, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, November 10th, 2010
    Time: 16:00-17:00 EET
    Host: Vasos Vassiliou (vasosv AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.nikoletseas

    Abstract:
    The efficient and robust realization of wireless sensor networks is a challenging technological and algorithmic task, because of the unique characteristics and severe limitations of these devices. This talk presents characteristic algorithms for important problems in wireless sensor networks, such as data propagation and energy balance. The protocol design uses key algorithmic techniques like randomization and local optimization. Crucial performance properties of the protocols (correctness, fault-tolerance, scalability) and their trade-offs are investigated through both analytic means and large scale algorithmic engineering. The experimental evaluation of algorithms for such networks is very beneficial, not only towards validating and fine-tuning algorithmic design and analysis, but also because of the ability to study the accurate impact of several important network parameters and technological details. Finally, we present some research challenges from on-going EU-funded Future Internet projects on smart/green buildings.

    Short Bio:
    Sotiris Nikoletseas is an Assistant Professor (tenured) at the Computer Engineering and Informatics Department of Patras University, Greece and Director of the SensorsLab at the Computer Technology Institute (CTI). He has been a Visiting Professor at the Universities of Geneva, Ottawa and Southern California (USC). His research interests include Algorithmic Techniques in Distributed Computing (focus on sensor networks and mobile networks), Probabilistic Techniques and Random Graphs, and Algorithmic Engineering. He has coauthored over 150 publications in Journals and refereed Conferences, 20 Book Chapters and two Books, one on the Probabilistic Method and another on Theoretical Aspects of Sensor Networks (Springer Verlag), while he has delivered several invited talks and tutorials. He has been one of the Editors of the Encyclopedia of Algorithms by Springer Verlag. He has served as the Program Committee Chair of many Conferences (DCOSS, MSWIM, ALGOSENSORS, MOBIWAC, WMAN, SEA), and as Editor in Chief and Editorial Board Member of major Journals (International Journal of Distributed Sensor Networks, IEEE Transactions on Computers etc.). He has co-initiated international conferences on sensor networking, like the IEEE International Conference on Distributed Computing in Sensor Systems (DCOSS) and the Algorithmic Aspects of Wireless Sensor Networks (ALGOSENSORS) Symposium. He has coordinated several externally funded European Union R&D Projects related to fundamental aspects of modern networks. (http://www.cti.gr/RD1/nikole/)

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Aspects of Neural Coding and Modelling Self-Control with Neural Networks Playing Games, Dr. Chris Christodoulou (University of Cyprus, Cyprus), Wednesday, November 3, 2010, 09:00-10:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Aspects of Neural Coding and Modelling Self-Control with Neural Networks Playing Games

    Speaker: Dr. Chris Christodoulou
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, November 3, 2010
    Time: 09:00-10:00 EET
    Host: Costas Pattichis (pattichi AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.christodoulou

    Abstract:
    This talk will be divided into two parts, the first concentrating on aspects of neural coding while the second describing an attempt to understand self-control and commitment behaviours through computational neuronal modelling. The problem of understanding neuronal coding (i.e., how the brain encodes/decodes and transmits information) ranks today (after nearly twenty years) amongst the most important fundamental issues in computational neuroscience, since a solution would provide the basis for the analytical evaluation of the brain’s information processing capability and would give us a further insight as to those aspects which are essential to its functional organisation. This part of the talk will initially focus on providing an answer to what determines the highly irregular firing at high rates in real neurons. In particular, it will show that the partial somatic reset mechanism is the most likely candidate to reflect the mechanism used by the brain for this purpose. It will then demonstrate that high firing irregularity enhances learning and more specifically, reward-modulated spike timing-dependent plasticity with eligibility trace. Finally, an attempt will be presented on deciphering the neural code through distinguishing the causes of firing with the membrane potential slope. Such a distinction is likely to provide an answer to whether neurons use rate coding (suggested by temporal integration), temporal coding (suggested by coincidence detection) or a combination of the two. Self-control can be defined as choosing a large delayed reward, while precommitment is the making of a choice with the specific aim of denying oneself future choices. Problems in exercising self control, suggest a conflict between cognition and motivation, which has been linked to competition between higher and lower brain functions or different value systems in the brain; in particular, parts of the limbic system are preferentially activated by decisions involving instant rewards, whereas regions of the prefrontal cortex are engaged uniformly by intertemporal choices irrespective of delay. This premise of an internal process model lead to a behaviour model being proposed, based on which we designed and implemented a computational model of self-control with two spiking or non-spiking neural networks representing the higher and lower brain systems viewed as cooperating for the benefit of the organism. As the structure of the self-control problem can be likened to the Iterated Prisoner’s Dilemma (IPD) game in that cooperation is to defection what self-control is to impulsiveness or what compromising is to insisting, we implemented the neural networks as two players, learning simultaneously but independently, competing in the IPD game. With a technique resembling the precommitment effect, whereby the payoffs for the dilemma cases in the IPD payoff matrix are differentially biased (increased or decreased), we showed that increasing the precommitment effect (through increasing the differential bias) increases the probability of cooperating with oneself in the future, irrespective of whether the implementation is with spiking or non-spiking neural networks. The contribution of this work to multiagent reinforcement learning will also be highlighted. This part of the talk will finish with an attempt to interpret our results on self-control through recent findings reported in the literature supporting that conflicts involving the delay of gratification, such as self-control problems lead to systematic changes in 'subjective experience' or consciousness. Can perturbations in consciousness, be related to the process of learning self-control behaviour by the brain in order to resolve the conscious conflict?

    Short Bio:
    Chris received a BEng degree in Electronic Engineering from Queen Mary and Westfield College, University of London (1991) and a PhD in Neural Networks/Computational Neuroscience from King's College, University of London (1997). He also holds a BA degree in German from Birkbeck College, University of London (2008). He worked as a Postgraduate Research Assistant (1991-1995) and a Postdoctoral Research Associate (1995-1997) at the Centre for Neural Networks, King's College, University of London. He joined Birkbeck College, University of London as a Lecturer in 1997 where he worked till August 2005 and he has also been a Visiting Research Fellow at King's College (1997-2001). From September 2005 he joined the University of Cyprus as an Assistant Professor and since then he is also a Visiting Research Fellow at Birkbeck College. Chris' research interests focus on Computational and Cognitive Neuroscience as well as on Neural Networks.

    Note:
    This colloquium is part of the speaker's procedure for evaluation and promotion from Assistant Professor to Associate Professor.

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    Colloquium: Cross Layer Rate Adaptation in Wireless Ad-hoc Networks, Dr. Emmanouil G. Spanakis (University of Cyprus, Cyprus), Monday, October 4th, 2010, 14:00-15:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Cross Layer Rate Adaptation in Wireless Ad-hoc Networks

    Speaker: Dr. Emmanouil G. Spanakis
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, October 4th, 2010
    Time: 14:00-15:00 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy) and George Pallis (gpallis AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.spanakis

    Abstract:
    In a wireless network, with nodes sharing the same spectrum, each transmission is affected from, and affects, all other transmissions in range. When multiple uncoordinated links share a common medium the effect of interference is a crucial limiting factor for network performance. The general objective of this work is to present an in-depth analysis of how cross layer techniques can be used in the design and study of wireless ad hoc networks. We focus on finding how adapting various parameters of the telecommunication system can allow concurrent transmissions, minimize interference, enhance network throughput, maximize individual link data rates, and optimally utilize the network resources for all competing transmissions. Initially, we study the transmission rate regions for a simplified wireless network with a given degree of interference, considered as noise, and individual power constrains. We define the necessary conditions that maximize the system’s aggregate rate and provide criteria under which simultaneous link operation outperforms timesharing. Then, we study the interference exhibited at the center of a circular networking area and define the interference limited communication range to be the critical communication region around a receiver within which a successful communication link can be formed. Finally, we examine the multicast throughput of a group and show its dependence on the transmission rate.

    Short Bio:
    Emmanouil G. Spanakis is a post-doctoral fellow at the Computer Science department in University of Cyprus under the Marie Curie Transfer of Knowledge program. He holds a B.Sc. and a M.Sc. in Computer Science and he received his Ph.D degree in Computer Science in 2009 from the University of Crete, Heraklion, Greece. Since 1998, he has been a member of the Telecommunications and Networks Laboratory and the Biomedical Informatics Laboratory of FORTH- ICS as a research intern in many collaborative R&D projects in the area of wireless communication networks, wireless ad hoc networks and ambient intelligence e-health environments. He has expertise and specialisation on issues of the wider scientific domain of wireless communication networks and computational medicine, and in particular on cross layer design in wireless ad-hoc networks, wireless interference channel under SINR constrains, performance and analysis of mobile ad-hoc routing protocols, wireless network measurements analysis as well as in biomedical informatics, wireless medical sensors and ambient e-health and m-health related services.

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    Colloquium: Query Optimization in Wireless Sensor Networks, Dr. Georgios Chatzimilioudis (University of Cyprus, Cyprus), Monday, Sept. 27th, 2010, 14:00-15:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Query Optimization in Wireless Sensor Networks

    Speaker: Dr. Georgios Chatzimilioudis
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, Sept. 27th, 2010
    Time: 14:00-15:00 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy) and Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.chatzimilioudis

    Abstract:
    The objective of this work is to optimize query execution in wireless sensor networks. To answer a query, data generated by the sensors need to be collected and processed. The cost of query execution is measured in the energy spent by the wireless sensor network. We minimize the energy needed by constructing sophisticated query trees that determine how data will be routed towards the sink and where the data will be processed inside the network. We propose query trees for optimizing two types of queries: queries that need data from all the nodes in the network and queries that need data from a subset of nodes only. For the former type of queries we minimize the energy consumption using communication balancing to minimizing the collisions during query execution. We propose a distributed algorithm to construct a near-optimal balanced communication tree with minimum overhead. Our algorithm outperforms previous work both in tree construction overhead and in tree balance. For the latter type of queries use operator trees and dynamic operator placement that minimize the bytes transmitted during query execution. We propose a centralized algorithm for constructing an operator tree and an initial operator placement based on an adaptation of the Fermat point problem (1-median problem) for a weighted graph. We also propose an optimal parameter-free decentralized algorithm to adapt the placement of a single operator.

    Short Bio:
    Georgios Chatzimilioudis received his Ph.D. in Computer Science in University of California Riverside in June 2010. His work focused on data management in wireless sensor networks and query otpimization in sepcific. He has also completed long-term internships at the R&D units of Siemens (2007) and Siemens Corporate Research (2008). Currently he is a post-doctoral fellow at the Computer Science department in University of Cyprus under the Marie Curie Transfer of Knowledge program. His primary research interests include data management and distributed query processing in wireless sensor networks, vehicular networks peer-to-peer systems.

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    Colloquium: High Performance Cache Management Policies for Addressing the Memory Wall on Chip-Multiprocessors, Dr. Aamer Jaleel (Intel Massachusetts, USA), Thursday, Sept. 16th, 2010, 12:00-13:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    High Performance Cache Management Policies for Addressing the Memory Wall on Chip-Multiprocessors

    Speaker: Dr. Aamer Jaleel
    Affiliation: Intel Massachusetts, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, Sept. 16th, 2010
    Time: 12:00-13:00 EET
    Host: Yanos Sazeides (yanos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.jaleel

    Abstract:
    Increasing on-chip cache sizes and the widespread use of shared caches in CMPs has revived cache management as a hot research topic in both industry and academia. This talk focuses on improving cache performance by describing the cache management problem in a novel framework called Re-Reference Interval Prediction (RRIP) . The first part of the talk aims at improving the performance of the last-level cache (LLC). In this portion of the talk, we use RRIP to address the drawbacks of the commonly used LRU replacement policy. LRU replacement performs badly when the application working-set size is larger than the available cache or applications have frequent bursts of references to non-temporal data (called scans). To improve the performance of such applications, we propose Static RRIP (SRRIP) and Dynamic RRIP (DRRIP). We show that SRRIP and DRRßßIP do not require changes to the existing cache design, have insignificant hardware overhead, and can easily be integrated into the existing cache designs of modern high performance processors. The next part of the talk focuses not just on improving LLC performance but also on improving the performance of a multi-level cache hierarchy. In particular, we focus on improving the performance of an inclusive cache hierarchy. Inclusive caches are commonly used by microprocessors to simplify cache coherence. However, the trade-off has been lower performance compared to non-inclusive and exclusive caches. Contrary to conventional wisdom, we show that the limited performance of inclusive caches is due to inclusion victims-lines that are evicted from the core caches to satisfy the inclusion property-and not the reduced cache capacity of the hierarchy due to the duplication of data. These inclusion victims are incorrectly chosen for replacement because the last-level cache (LLC) is unaware of the temporal locality of lines in the core caches. We propose Temporal Locality Aware (TLA) cache management policies to allow an inclusive LLC to be aware of the temporal locality of lines in the core caches. We propose three TLA policies: Temporal Locality Hints (TLH), Early Core Invalidation (ECI), and Query Based Selection (QBS). We show that all three improve the performance of inclusive caches without requiring any additional hardware structures. In fact, QBS performs similar to a non-inclusive cache hierarchy.

    Short Bio:
    Aamer Jaleel is a member of the VSSAD group at Intel Massachusetts Inc. Aamer's research interests include cache/memory system design, parallel architectures, micro-architecture, performance modeling, and workload characterization. While at Intel, Aamer's research work has contributed towards enhancement in performance modeling and improvements in the design of next generation Intel microprocessors. Aamer received his Ph.D. in Electrical Engineering from the University of Maryland, College Park in 2005.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: The Algorithmic Lens: How Computational Thinking Changes the Sciences - Ο Αλγοριθμικός Φακός: Πώς η Υπολογιστική Σκέψη Αλλάζει τις Επιστήμες, Prof. Christos Η. Papadimitriou (University of California - Berkeley, USA), Thursday, July 29th, 2010, 16:00-17:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    The Algorithmic Lens: How Computational Thinking Changes the Sciences - Ο Αλγοριθμικός Φακός: Πώς η Υπολογιστική Σκέψη Αλλάζει τις Επιστήμες

    Speaker: Prof. Christos Η. Papadimitriou
    Affiliation: University of California - Berkeley, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, July 29th, 2010
    Time: 16:00-17:00 EET
    Host: Marios Mavronicolas (mavronic AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.papadimitriou

    Abstract:
    (In Greek) Η υπολογιστική έρευνα αλλάζει τις επιστήμες (τις φυσικές, μαθηματικές, και κοινωνικές επιστήμες, καθώς και τις επιστήμες ζωής) όχι μόνο με το να τις ενδυναμώνει αναλυτικά, αλλά κυρίως με το να τους παρέχει νέες οπτικές γωνίες που συχνά οδηγούν σε απρόβλεπτες διαισθήσεις. Τα παραδείγματα είναι πολλά: Οι κβαντικοί υπολογισμοί προσφέρουν το κατάλληλο πλαίσιο για την αμφισβήτηση και την επανεξέταση μερικών από τις πιο βασικές αρχές της κβαντικής φυσικής, ενώ η στατιστική μηχανική έχει βρει μια ισχυρή αναλογία για τις αλλαγές φάσεων στην αποδοτικότητα των πιθανοτικών αλγορίθμων. Στα μαθηματικά, το ερώτημα "P vs. NP" ανήκει πλέον στη λίστα των πλέον σημαντικών άλυτων προβλημάτων, ενώ στα οικονομικά, η μελέτη της υπολογιστικής πολυπλοκότητας οδηγεί σε αναθεώρηση των προβλέψεων για οικονομικές συμπεριφορές και επηρεάζει το σχεδιασμό οικονομικών μηχανισμών, όπως των δημοπρασιών. Τέλος, στη βιολογία, κάποια από τα πλέον θεμελιώδη προβλήματα, όπως η κατανόηση του εγκεφάλου και της εξέλιξης, μπορούν να επαναδιατυπωθούν παραγωγικά με υπολογιστικούς όρους.

    Short Bio:
    (In Greek) Ο Χρίστος Παπαδημητρίου σπούδασε στο Εθνικό Μετσόβιο Πολυτεχνείο όπου έλαβε Δίπλωμα Ηλεκτρολόγου-Μηχανολόγου Μηχανικού το 1972. Στη συνέχεια ακολούθησε μεταπτυχιακές σπουδές στο Πανεπιστήμιο Princeton, όπου απέκτησε Διδακτορικό Δίπλωμα το 1976. Ο Χρίστος Παπαδημητρίου είναι από το 1996 μέχρι σήμερα ο Καθηγητής της Έδρας C. Lester Hogan στο Τμήμα Ηλεκτρολόγων Μηχανικών και Επιστήμης Υπολογιστών, University of California at Berkeley. Διετέλεσε μέλος Ακαδημαϊκού Προσωπικού στα Πανεπιστήμια Harvard (Gordon McKay Επίκουρος Καθηγητής Επιστήμης Υπολογιστών, 1976-1978), Berkeley (Miller Fellow for Science, 1978-1979), M.I.T. (Επίκουρος Καθηγητής 1979-1981, και Αναπληρωτής Καθηγητής μέχρι το 1983), Stanford (Καθηγητής Επιστήμης Υπολογιστών και Επιχειρησιακής Έρευνας 1983-1988), και University of California at San Diego (Καθηγητής της Έδρας Irwin Mark and Joan Klein Jacobs, Τμήμα Επιστήμης και Μηχανικής Υπολογιστών, 1988-1995). Διετέλεσε Καθηγητής στο Εθνικό Μετσόβιο Πολυτεχνείο (Τμήμα Ηλεκτρολόγων Μηχανικών) κατά την περίοδο 1981-1988. Το ερευνητικό έργο του Χρίστου Παπαδημητρίου καλύπτει ένα ευρύ φάσμα θεωρητικών προβλημάτων σε πολλές περιοχές της Επιστήμης Υπολογιστών. Η έρευνά του οδήγησε σε θεμελιώδη αποτελέσματα στη Θεωρία Αλγορίθμων, Θεωρία Πολυπλοκότητας, Συνδυαστική Βελτιστοποίηση και Θεωρεία Βάσεων Δεδομένων. Το ερευνητικό του έργο επεκτείνεται και σε άλλους επιστημονικούς κλάδους όπως Μαθηματική Οικονομική, Επιχειρησιακή Έρευνα, Θεωρία Παιγνίων, και αυτό έχει αποτελέσει τη βάση για ποικίλες πρακτικές εφαρμογές (τελευταία μάλιστα στο Διαδίκτυο). Το ερευνητικό έργο του Χρίστου Παπαδημητρίου αποτελείται από περισσότερες των τριακοσίων δημοσιεύσεων σε έγκριτα περιοδικά και πρακτικά συνεδρίων. Έχει συγγράψει πέντε διδακτικά βιβλία τα οποία χρησιμοποιούνται ευρέως σε προπτυχιακό και μεταπτυχιακό επίπεδο. Έχει επίσης διατελέσει μέλος στις εκδοτικές επιτροπές πολύ σημαντικών περιοδικών της Επιστήμης Υπολογιστών όπως Journal of the ACM, Journal of Computer and Systems Sciences, Algorithmica, Theoretical Computer Science, Information and Computation, SIAM Journal on Computing, Journal of AI Research, SIAM Journal on Discrete Mathematics, και άλλα. Ο Χρίστος Παπαδημητρίου έχει τιμηθεί με πολλές διακρίσεις για τη συνεισφορά του στην Επιστήμη Υπολογιστών. Είναι εταίρος της Αμερικανικής Ακαδημίας Τεχνών και Επιστημών (Η.Π.Α.) από το 2001. Είναι μέλος της Εθνικής Ακαδημίας Μηχανικής (Η.Π.Α.) από το 2002. Ο Χρίστος Παπαδημητρίου είναι ACM Εταίρος από το 2001 ως αναγνώριση της εξαιρετικής συνεισφοράς του στα πεδία της Θεωρίας Πολυπλοκότητας, Θεωρίας Βάσεων Δεδομένων και Συνδυαστικής Βελτιστοποίησης. Το 2002, ο Χρίστος Παπαδημητρίου έλαβε το Donald E. Knuth Prize, το οποίο απονέμεται από τους οργανισμούς ACM και IEEE ως αναγνώριση εξαιρετικής συνεισφοράς στις θεμελιώσεις της Επιστήμης Υπολογιστών. Ειδικότερα, το βραβείο απονεμήθηκε στον Χρίστο Παπαδημητρίου ως αναγνώριση των επί πολλά έτη και κεφαλαιώδους σημασίας συνεισφορών του στις θεμελιώσεις της Επιστήμης Υπολογιστών. Ο Χρίστος Παπαδημητρίου συγκαταλέγεται στον κατάλογο Highly Cited (http://www.isihighlycited.com/) για την Επιστήμη Υπολογιστών με βάση το μεγάλο αριθμό αναφορών στο δημοσιευμένο έργο του. Τέλος, είναι Επίτιμος Διδάκτωρ των Πανεπιστημίων ETH Ζυρίχης (Sc. D. honoris causea), Μακεδονίας (Ph. D., honoris causea), Αθηνών (Ph.D., honoris causea) και Κύπρου (Ph.D., honoris causea).

    Note:
    Please notice that the talk will be given in Greek.

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    Colloquium: OCTEON Multi-Core Design Choices, Dr. Shubu Mukherjee (Cavium Networks, Marlborough, MA, USA), Wednesday, July 14th, 2010, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    OCTEON Multi-Core Design Choices

    Speaker: Dr. Shubu Mukherjee
    Affiliation: Cavium Networks, Marlborough, MA, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, July 14th, 2010
    Time: 11:00-12:00 EET
    Host: Yiannakis Sazeides (yanos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.mukherjee

    Abstract:
    Cavium Networks is a provider of highly integrated semiconductor processors that enable intelligent networking, communications, storage, video and security applications. Cavium Networks offers a broad portfolio of integrated, software compatible processors ranging in performance from 10+ Mbps to 40Gbps that enable secure, intelligent functionality in Enterprise, Data-Center, Broadband/Consumer and Access and Service Provider equipment. This talk will describe some of the design choices around Cavium's multicore processors to illustrate how simpler cores can make a bigger difference in this market than massively out-of-order power-hungry processors.

    Short Bio:
    Dr. Mukherjee is widely recognized as one of the experts on architecture design for soft errors. He has made pioneering contributions towards the design of Redundant Multithreading (RMT) techniques, architectural vulnerability modeling for soft errors, creation of performance modeling infrastructure called Asim (jointly with Dr. Joel Emer), design of the Alpha 21364 interconnection network, and the creation of the first shared memory prediction scheme. In 2009, Shubu won the Maurice-Wilkes award for outstanding contributions to computer architecture. This is the highest award given to a mid-career architect. Prior winners include Dirk Meyer (CEO AMD), Bill Dally (Chief Scientist Nvidia), Steve Scott (CTO Cray), and Anant Agarwal (Prof MIT and Founder of Several Companies). Shubu is also a Fellow of IEEE and Distinguished Member of ACM. He was the General Chair of 2004 ASPLOS and will be the Program Chair for 2011 HPCA conferences. He wrote the seminal book on "Architecture Design for Soft Errors," which has been highly acclaimed by Microprocessor Report as well as researchers and practitioners. Shubu holds 25 patents and has 23 patents pending. He has written over 50 technical papers in top architecture conferences and journals. Currently, Dr Mukherjee is a Distinguished Engineer at Cavium Networks involved in architecting Cavium's next network processor. He is also Adjunct Faculty with the Indian Institute of Technology, Kanpur. In the past, Shubu Mukherjee was a Principal Engineer and Director of Intel's SPEARS Group (Simulation and Pathfinding of Efficient and Reliable Systems). The SPEARS Group was responsible for spearheading architectural change and innovation in the delivery of enterprise processors and chipsets by building and supporting simulation and analytical models of performance, power, and reliability. Shubu has taken 5 innovations in large-scale system monitoring, soft error tolerant micro-architectures, performance simulation, parallel simulation, and on-chip interconnect design from conception to implementation. These innovations have resulted in 100s of millions of dollars in increased revenue for Intel and Compaq, reduced internal costs by 10s of millions of dollars, influenced over a dozen products, and improved customer goodwill significantly.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Personalization, Socialization, Contextualization: Preferences and Attitudes for Advanced Information Provision, Prof. Yannis Ioannidis (Univ. of Athens, Greece), Monday, June 28th, 2010, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Personalization, Socialization, Contextualization: Preferences and Attitudes for Advanced Information Provision

    Speaker: Prof. Yannis Ioannidis
    Affiliation: Univ. of Athens, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, June 28th, 2010
    Time: 15:00-16:00 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.ioannidis

    Abstract:
    Human actions in real life are often influenced by several characteristics of the individual human involved in the actions. These characteristics can be broadly classified into three categories: those that are unique to the individual, those of the social environment of the individual, and those of the overall context or situation in which the individual is found while performing the actions. Usability of various types of information systems, e.g., database systems, digital libraries, or the Web, increases dramatically if the information they provide and their overall behavior is customized to these characteristics. Such personalization, socialization, and contextualization of information provision touches upon a broad spectrum of technical and other challenges. This talk describes the general problem and its associated challenges, hints upon a general framework for modeling a large number of cases, and offers some examples of systems and techniques that have been developed by the Univ. of Athens to address related challenges in various application environments.

    Short Bio:
    Yannis Ioannidis is currently a Professor at the Department of Informatics and Telecommunications of the University of Athens. He received his Diploma in Electrical Engineering from the National Technical University of Athens in 1982, his MSc degree in Applied Mathematics from Harvard University in 1983, and his Ph.D. degree in Computer Science from the University of California at Berkeley in 1986, and was on the faculty of the Computer Sciences Department of the University of Wisconsin at Madison, where he became a Professor before leaving in 1999. His research interests include database and information systems, electronic infrastructures, digital libraries, personalization, scientific systems, and human-computer interaction, topics on which he has published over one hundred articles in leading journals and conferences and holds three patents. Dr. Ioannidis is an ACM and IEEE Fellow and has received the Presidential Young Investigator (PYI) award in 1991, the 2003 VLDB "10-Year Best Paper Award", the 2006 nation-wide "Xanthopoulos-Pnevmatikos Award for Outstanding Academic Teaching" in Greece, and of several other teaching awards. He has been a program (co-)chair of ICDE'09 and several other conferences and a (co-)principal investigator in over thirty research projects funded by various government agencies (Europe, Greece, USA) or private industry. Dr. Ioannidis currently serves a 4-year term as the ACM SIGMOD Chair (following a 4-year term as Vice-Chair) and is or has been a member of several other executive bodies of professional organizations (VLDB Endowment, IEEE TCDE Executive Committee, EDBT Endowment) and Scientific Advisory Boards (Max Planck Institute for Informatics, Greek National Science & Technology Council, Information Technology advisor to the Greek Minister of Health).

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    Colloquium: Towards Energy Efficient Database Computing, Dr. Stavros Harizopoulos (HP Labs, Palo Alto, USA), Tuesday, June 15th, 2010, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Towards Energy Efficient Database Computing

    Speaker: Dr. Stavros Harizopoulos
    Affiliation: HP Labs, Palo Alto, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, June 15th, 2010
    Time: 11:00-12:00 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.harizopoulos

    Abstract:
    Rising energy costs in large data centers drive the agenda for energy efficient computing. Towards this goal, it is critical to understand the interplay between energy consumption and performance in database servers. In the first part of this talk, I will focus on quantifying the role of database software in the overall energy efficiency of a server. Then, I will present the results of a recent study (SIGMOD'10) on the power usage profiles of database operators and I will explore the effect of different configuration parameters in the energy efficiency of a database system. Finally, I will discuss our work on query processing on solid state drives (SIGMOD'09), which have emerged as a primary building block for energy efficient storage.

    Short Bio:
    Stavros is an HP Labs researcher in the Intelligent Information Management Lab which is focused on enabling near real-time business intelligence with robust, scalable data management and data-intensive analytics. He received his Ph.D. in Computer Science from Carnegie Mellon, in 2005, and, through 2007, he worked as a Post-Doctoral researcher at the DB group of MIT. Stavros's research interests are in energy-efficient data management systems, query processing on new processor and storage technologies, main-memory transaction processing, and column-oriented databases. For more information: http://nms.csail.mit.edu/~stavros/

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Augmented Vision, Prof. Dr. Didier Stricker (German Research Center for Artificial Intelligence, Germany), Monday, March 22, 2010, 18:00-19:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Augmented Vision

    Speaker: Prof. Dr. Didier Stricker
    Affiliation: German Research Center for Artificial Intelligence, Germany
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, March 22, 2010
    Time: 18:00-19:00 EET
    Host: Yiorgos Chrysanthou (yiorgos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2010.stricker

    Abstract:
    It is has long been understood that automated systems aiming to assist or interact with human activity need to have a degree of understanding of human behaviour in order to be effective. Actions and responses need to align with our expectations and information needs to be presented in a manner which reflects our own perceptions. What is less well understood is how that understanding of behaviour is to be obtained. In this talk we will present the very first work of the department "augmented vision" of DFKI. The focus lies on capturing technologies and includes head-, hand-, arm- tracking, object identification and scene reconstruction. The goal is to build a precise digital representation of a real and dynamic scene, including humans executing given tasks and interacting with the surrounding. The technologies involve visual-inertial sensor units, inertial on-body sensors, fisheye as well as high-resolution spherical HDR-images. Current results will be presented and discussed in relations with achieved quality and required computing resources.

    Short Bio:
    Didier Stricker is member of the Management Board of the German Research Center for Artificial Intelligence (DFKI GmbH) in Kaiserslautern where he leads the new research department "Augmented Vision". He is appointed as Professor at the Computer Science Department of the University of Kaiserslautern. From 2002 to June 2008 Didier Stricker lead the department "Virtual and Augmented Reality" at the Fraunhofer Institute for Computer Graphics (Fraunhofer IGD) in Darmstadt, Germany. More information: http://av.dfki.de/

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Census and Survey of the Visible Internet, Prof. Christos Papadopoulos (Colorado State University, USA), Tuesday, December 22st, 2009, 11:30-12:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Census and Survey of the Visible Internet

    Speaker: Prof. Christos Papadopoulos
    Affiliation: Colorado State University, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, December 22st, 2009
    Time: 11:30-12:30 EET
    Host: Andreas Pitsillides (andreas.pitsillides AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.papadopoulos

    Abstract:
    Many Internet topology studies have appeared in the literature. However, such studies have for the most part, ignored the population of hosts. While many hosts are hidden behind firewalls and NATs, there is much to be learned from examining the population of "visible" Internet hosts -- one can better understand network growth and accessibility to help assess vulnerabilities, deployment of new technologies and improve network models. This paper is to our knowledge the first attempt to measure the population of visible Internet edge hosts. We measure hosts in two ways: via periodic Internet censuses, where we query all accessible Internet addresses every few months, and via surveys of a small fraction of the responsive address space, probing each address every 11 minutes for one week. These approaches are complementary: a census is effective at evaluating the Internet as a whole, while surveys validate the census and allow observation of the lifetime of typical address occupancy. Our findings include trends in address occupancy, an upper bound on the number of servers and an analysis of firewalled addresses and firewall block size. Joint work with John Heidemann, Yuri Pryadkin, Ramesh Govindan and Joseph Bannister.

    Short Bio:
    Christos Papadopoulos is currently an associate professor at Colorado State University. He received his Ph.D. in Computer Science in 1999 from Washington University in St. Louis, MO. His interests include network security, router services, multimedia protocols and reliable multicast. His current work includes signal processing techniques for network attack detection and participation in the PREDICT program to collect network traces for security research.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: A Game for Optimizing Randomized Patrols on a Network, Dr. Katerina Papadaki (London School of Economics, UK), Monday, December 21, 2009, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    A Game for Optimizing Randomized Patrols on a Network

    Speaker: Dr. Katerina Papadaki
    Affiliation: London School of Economics, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, December 21, 2009
    Time: 11:00-12:00 EET
    Host: Andreas Pitsillides (andreas.pitsillides AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.papadaki

    Abstract:
    This paper describes a class of patrolling games on graphs, motivated by the problem of patrolling a network vulnerable to viral infection or a facility (for example in order to defend an art gallery against theft of a painting, or an airport against terrorist attack). The network/facility can be thought of as a graph Q of interconnected nodes (e.g. rooms, terminals) and the Attacker can choose to attack any node of Q within a given time T. He requires m consecutive periods there, uninterrupted by the Patroller, to commit his nefarious act (and win). The Patroller can follow any path on the graph. Thus the patrolling game is a win-lose game, where the Value is the probability that the Patroller successfully intercepts an attack, given best play on both sides. We determine analytically optimal (minimax) patrolling strategies for various classes of graphs, and present numerical results for some intractable cases. Joint work with Steve Alpern and Alec Morton

    Short Bio:
    Katerina Papadaki is a tenured Lecturer in the Operational Research Group, Department of Management at the London School of Economics. She received her PhD from Princeton University in 2002, from the Department of Operational Research and Financial Engineering, her MSc in Operational Research from the London School of Economics in 1996, and her BA in Pure Mathematics and Statistics from the University of California at Berkeley in 1994. A major component of her research has been in developing algorithms to solve stochastic multidimensional dynamic programs that arise in dynamic resource allocation problems with applications involving physical resources (transportation networks), and radio resource allocation (wireless communication networks). Subsequently, using discrete optimization techniques she has developed algorithms for scheduling and routing problems in cellular wireless networks. Amongst others, she has worked on robust optimization techniques for scheduling, facility location routing problems, and network optimization on vehicular communications and intelligent transportation systems. Recently, her research attention has been on game theoretic problems. These include fair allocation of resources in telecommunication networks using cooperative game theory, inspection games with applications in inspections of NHS hospitals, and network patrolling games with applications in network security. She is associate editor of Optimization Letters and a member of INFORMS and IEEE.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Adaptive Resource Location and Query Processing for Peer-to-Peer Networks, Dr. Dimitrios Tsoumakos (NTUA, Greece and University of Cyprus, Cyprus), Wednesday, November 4th, 2009, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Adaptive Resource Location and Query Processing for Peer-to-Peer Networks

    Speaker: Dr. Dimitrios Tsoumakos
    Affiliation: NTUA, Greece and University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, November 4th, 2009
    Time: 15:00-16:00 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.tsoumakos

    Abstract:
    Peer-to-Peer (P2P) computing has gained a lot of attention from both the scientific and the large Internet user community. Popular applications utilizing this new technology offer many attractive features to a growing number of users while taking up a large amount of everyday network traffic. This talk presents bandwidth-efficient and adaptive algorithms to facilitate data location and processing for massive data management applications that operate on P2P overlays. The basis of these schemes is their ability to learn from past interactions, increasing their performance with time. In the first part of the talk, previous work in efficient content location and distribution for Unstructured Peer-to-Peer overlays is described. The Adaptive Probabilistic Search (APS) scheme utilizes directed walkers to forward queries on a hop-by-hop basis. Peers store success probabilities for each of their neighbors in order to efficiently route towards object holders. In the GrouPeer project, we apply many of these techniques in order to identify and group peers with similar schemas in an interconnected network of autonomous databases. In the second part of the talk I will present some of my current work which focuses on indexing methods for data and query-intensive applications over P2P overlays. HiPPIS and PASSION are systems that utilize adaptive algorithms that automatically adjust the level of indexing (for hierarchically organized data or ranges respectively) according to the granularity of the incoming queries, without assuming any prior knowledge of the workload. Brown Dwarf is a complete system for distributing and querying data-cubes w.r.t. load and network/node failures.

    Short Bio:
    Dimitrios Tsoumakos is a visiting lecturer at the Computer Science Department of UCY. He received his Diploma in Electrical and Computer Engineering from NTUA in 1999, joined the graduate program in Computer Sciences at the University of Maryland in 2000, where he received his M.Sc. (2002) and Ph.D. (2006). He has been collaborating as a senior researcher with the Computing Systems Laboratory in the Department of Electrical and Computer Engineering of the National Technical University of Athens (NTUA) since 2006.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Recommender Systems: Enabling the Provision of Recommendations from Multiple Domains, Dr. Antonis Loizou (University of Southampton, UK), Wednesday, October 14th, 2009, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Recommender Systems: Enabling the Provision of Recommendations from Multiple Domains

    Speaker: Dr. Antonis Loizou
    Affiliation: University of Southampton, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, October 14th, 2009
    Time: 15:00-16:00 EET
    Host: Yannis Dimopoulos and Marios Dikaiakos ({yannis,mdd} AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.loizou

    Abstract:
    There has recently been a rapid increase in the commercial use of Recommender System technologies, primarily by online retailers. Such systems appear attractive to retailers, since they can be used to identify any products from their catalogue that can be expected to appear interesting to a particular customer, increasing the amount of purchases made. Thus, they are typically designed under assumptions that an exhaustive index of resources for recommendation is available, and that users can be adequately characterised solely through their interactions with such resources. The objective of my work is to show that by automatically and unobtrusively compiling a profile of user activities, a much more complete user representation can be obtained. Furthermore, resources for recommendation can be dynamically introduced to systems using such profiles, by importing preference data from external communities and social networks, thus enabling the provision of recommendations from multiple domains. A methodology for mapping user profiling elements, as well as the resources available for recommendation to Wikipedia articles has been developed to facilitate comparisons and address the problem of heterogeneity. Hyperlinks between Wikipedia articles are assumed to convey latent semantic relationships between the concepts they describe, and used to construct a graph using articles as nodes and hyperlinks as edges. A Markov chain model is then imposed over the graph, and exploited to drive the recommendation engine.

    Short Bio:
    A. Loizou received his PhD from the University of Southampton in June 2009, working at the Intelligence, Agents, Multimedia group under the supervision of Dr. Srinandan Dasmahapatra and Prof. Paul H. Lewis. He received his undergraduate degree in Computer Science with Artificial Intelligence also from the University of Southampton in 2005. With a background in Machine Learning and Probabilistic Reasoning, his PhD work has been in the field of Recommender Systems with a particular focus on developing systems that are able to provide recommendations from multiple domains. His research interests also include Semantic Web technologies, Multimedia annotation, Information Retrieval and Data Mining.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Engineering Autonomic Feedback Controllers for Multiprogramming Busy Internet Servers, Dr. Michele Mazzucco (University of Cyprus, Cyprus), Wednesday, October 7th, 2009, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Engineering Autonomic Feedback Controllers for Multiprogramming Busy Internet Servers

    Speaker: Dr. Michele Mazzucco
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, October 7th, 2009
    Time: 15:00-16:00 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.mazzucco

    Abstract:
    Resource multiplexing in commercial data centers is an effective way to achieve server consolidation, which can in turn increase the system's throughput as well as reduce the power consumption of Internet utilities. In this talk I will introduce a performance management model for monitoring the server's behavior and autonomically computing the optimal Multi-Programming Level (MPL) accordingly, i.e., the optimal number of jobs allowed to run concurrently, as a way to control the scheduling of jobs. Since the MPL can heavily influence the achievable performance but can not be computed off-line (it depends on several factors that can't be determined statically) a framework for autonomously controlling the MPL level is discussed. I will report the results of several experiments that have been carried out, showing that the proposed scheme can dynamically choose the 'best' MPL and reduce the average response time up to 33%.

    Short Bio:
    Michele Mazzucco is currently a Marie Curie Fellow at the University of Cyprus. He received his MSc from University of Bologna (Italy) in 2005, while he earned his PhD at Newcastle University (UK) in 2009 with a thesis focused on the design of adaptive service provisioning systems subject to QoS constraints. From 2006 to 2008 he worked as a Research Associate at Newcastle University (UK) on a BT funded project, while since March 2008 he is one of the committers at the Apache Software Foundation. His research interests include distributed systems and middleware, software architectures, autonomic computing and Quality of Service. Awards include a best paper and two EU patents.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Methods and Metrics for Estimating Web Evolution Characteristics, Dr. Ioannis Anagnostopoulos (University of Aegean, Greece), Tuesday, September 22, 2009, 15:00-16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Methods and Metrics for Estimating Web Evolution Characteristics

    Speaker: Dr. Ioannis Anagnostopoulos
    Affiliation: University of Aegean, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, September 22, 2009
    Time: 15:00-16:00 EET
    Host: Vasos Vassiliou (vasosv AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.anagnostopoulos

    Abstract:
    In this lecture, we will introduce several metrics and techniques for dealing with the size and other evolution rates of the web. The exponential growth of the web poses a serious challenge for the Internet/web search services (publicly known as search engines), due to the fact that their effectiveness relies on their information coverage. However, web search services not only have to cover an increasing quantity of information, but also to deal with evolution incidents, since new web documents and objects are relentlessly added, old ones are moved, while others frequently have their content changed or updated. The problem of measuring such characteristics stands as a non-trivial problem due to the nature and the structure of web itself. We will present measurements derived from real experiments conducted in the well-known Internet search services such as Google and MSN.

    Short Bio:
    Dr Ioannis E. Anagnostopoulos was born in Athens, Greece in 1975. He received his diploma from the Department of Electrical Engineering and Computer Technology, University of Patras, Greece, in 1998 and his PhD from the School of Electrical and Computer Engineering, National Technical University of Athens (NTUA), Greece, in 2004. Currently, he is with the University of the Aegean, at the Department of Information and Communication Systems Engineering, serving as a lecturer. His research interests include Internet and Web Technologies, Search and Retrieval Software Methodologies, E-Commerce, Telecommunication Networks and Intelligent Information Systems. Dr. Ioannis Anagnostopoulos is a member of the technical chamber of Greece, IEEE, IEE and ACM.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Distributed Cooperation and Adversity: Complexity Trade-Offs, Prof. Alexander A. Shvartsman (University of Connecticut, USA), Friday, September 18th, 2009, 16:30-17:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Distributed Cooperation and Adversity: Complexity Trade-Offs

    Speaker: Prof. Alexander A. Shvartsman
    Affiliation: University of Connecticut, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, September 18th, 2009
    Time: 16:30-17:30 EET
    Host: Chryssis Georgiou (chryssis AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.shvartsman

    Abstract:
    The problem of cooperatively performing a collection of tasks in a decentralized setting where the computing medium is subject to undesirable perturbations is one of the fundamental problems in distributed computing, with applications encompassing such important areas as Internet supercomputing, parallel simulation, and multi-agent collaboration. The perturbations in the computing medium are typically due to processor and software failures (benign or malicious), communication breakdowns, and unpredictable delays. Such perturbations become even more prominent when an application needs to harness massive amounts of available computational resources. To develop efficient solutions for computation problems based on distributed cooperation, it is important to understand efficiency trade-offs characterizing the ability of p processors to cooperate on t tasks in key models of computation in the presence of adversity. In this talk we survey historical and recent results for distributed cooperation roughly grouped along the following topics: (i) fundamental failure-sensitive bounds for distributed cooperation problems for synchronous crash-prone processors, (ii) upper and lower bounds on distributed cooperation in shared-memory models, (iii) bounds on distributed work in message-passing models and on redundant work for processors that may experience prolonged absence of communication.

    Short Bio:
    Alexander A. Shvartsman is a Professor and Associate Head in the Department of Computer Science and Engineering at University of Connecticut, USA. He is the Director of the Dependable Distributed Systems Group and of the Voting Technology Research Center. His research interests are in the Principles and Practice of Distributed and Parallel Computing. His research has been funded by several NSF grants, including the NSF Career Award. He has authored more than 120 papers, two books, and several book chapters. Dr. Shvartsman has chaired and served on many program committees of the top conferences in Distributed Computing, he chaired the Steering Committee of DISC (2004-2007), and he is a Vigneron d'Honneur of Jurade de Saint-Emilion. For more info: http://www.cse.uconn.edu/~aas/

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: A Routerless System-Level-Interconnect for Large Scale Multicore Systems, Prof. Donald M. Chiarulli (University of Pittsburgh, USA), Friday, June 5th, 2009, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    A Routerless System-Level-Interconnect for Large Scale Multicore Systems

    Speaker: Prof. Donald M. Chiarulli
    Affiliation: University of Pittsburgh, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, June 5th, 2009
    Time: 11:00-12:00 EET
    Host: Pedro Trancoso (pedro AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.chiarulli

    Abstract:
    This research is aimed at the development of a new interconnection network and control architecture for large-scale multi-core processors. It is designed to operate efficiently in systems with hundreds to thousands of active processor cores and provides a fully interconnected topology. Multiple programming models including symmetric common memory architectures are directly supported without significant restrictions imposed by the underlying network. Our specific focus is on a innovative set of design paradigms for these systems that are adaptable to both current CMOS electronic interconnection technology as well future silicon-optics technology. There are two fundamental ideas behind these paradigms. First, in designing both the physical interconnection network and the control algorithms, we endeavor to migrate complexity to the edges of network. This means that there will be little or no intelligence or routing capability in the network core. Instead, the physical interconnection network model is a simple many-to-many bus-style interconnection with distributed routing and access control decisions made exclusively the node interfaces. To make the network scalable, the strategy is to partition the network into sub-nets with multiple transceivers, one per subnet at each node interface. Each subnet connects the transmitters for all of the nodes in one partition to the receivers at all of the nodes in one other. The second fundamental idea is the basis of the scalable control architecture. Once again, our criterion is that all routing and control decisions must be fully distributed across nodes at the edges of the network. However, since there are no scalable solutions that can provide the global information at the timescale of individual bus transactions, bus access at this level is governed using a simple greedy algorithm. Each node claims a bus transaction on demand without regard to any pending claims by other nodes. When conflicts occur, a hardware encoded fixed rule, such as physical ordering on the bus, determines the winner. On a second level, in a time base spanning multiple transactions, a negative feedback mechanism is used to throttle the greedy algorithm at each node. When a node anticipates bus activity, it broadcasts a negative feedback message to all nodes. At every active node, the amount of negative feedback present limits the level of greed. At the time scale of this control algorithm, network bandwidth is near optimally allocated with a small percentage reserved to allow non-active nodes to initiate. Both levels allow for a great deal of flexibility. Overall bandwidth can allocated on a per node basis in the first level, by locally adjusting the strength of feedback. The second level control algorithm can operate on a demand basis or it can be made predicative by modeling software behavior or linkage to cache management algorithms.

    Short Bio:
    Donald M. Chiarulli is a Professor of Computer Science and Computer Engineering at the University of Pittsburgh. He received his M.S. degree in Computer Science from the Virginia Polytechnic Institute and his Ph.D. also in Computer Science from Louisiana State University. Dr. Chiarulli's research interests are in Computer Architecture and are specifically focused on the application of novel technology to interconnection networks, system packaging, and mixed technology integration. Contributions from Dr. Chiarulli's group have included the demonstration of the first all-optical address decoder and several designs for time/space multiplexed data bus architectures. Recent contributions include the Partitioned Optical Passive Star (POPS) architecture for multiprocessor interconnection networks and the Multi Bit Differential Signaling (MBDS) methodology. Dr. Chiarulli has authored or co-authored over 40 technical papers including two that earned best paper awards at the International Conference on Neural Networks (ICNN) and the Design Automation Conference (DAC) respectively. Dr. Chiarulli is a member of the IEEE, and the SPIE.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Why do we Commit to an Uncertain Future?, Dr. Gaye Banfield (Drensder Kleinwort, UK), Wednesday, May 27th, 2009, 16:00-17:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Why do we Commit to an Uncertain Future?

    Speaker: Dr. Gaye Banfield
    Affiliation: Drensder Kleinwort, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, May 27th, 2009
    Time: 16:00-17:00 EET
    Host: Chris Christodoulou (cchrist AT ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.banfield

    Abstract:
    Empirical data in psychology suggests that we recognize we have self-control problems and attempt to overcome them by exercising precommmitment, which biases our future choices to a larger, later reward. The behavioral model of self-control as an internal process is taken from psychology and implemented, using a top-down approach, as a computational model of the human brain. The higher and lower brain systems, represented by two Artificial Neural Networks (ANNs) using reinforcement learning, are viewed as cooperating for the benefit of the organism, as opposed to the classical view of the higher brain overriding the lower brain. The ANNs are implemented as two players, learning simultaneously, but independently. Psychological studies suggest that the structure of the self-control problem can be likened to the Iterated Prisoner's Dilemma game in that cooperation is to defection what self-control is to impulsiveness. I hypothesise that increasing precommitment increases the probability of cooperating with oneself in the future. To this aim, precommitment is implemented in one of three ways. The first investigates the effect of implementing precommitment by simply varying the input value of the ANN's bias node between 0 and 1 (instead of fixed as 1). This method is referred to as the 'variable bias' method. The second implements precommitment as an extra input to the ANNs in the 2-ANNs model. In this case the ANN's threshold is implemented in the usual way, i.e., as a node with an input value of 1 whose weight is trainable in the same way as the other nodes in the network and precommitment is implemented as an additional node to the input layer. This method is referred to as the 'extra input bias' method. The final method implements a bias towards future rewards as a differential bias applied to the payoff matrix. Again the ANN's threshold is implemented in the usual way, i.e., as a node with an input value of 1 whose weight is trainable in the same way as the other nodes in the network. This method is referred to as the 'differential bias method'. Finally, I investigate what role evolution has played in shaping our willingness to precommit to future rewards by subjecting the model to simulation of evolutionary adaptation. Results suggest that evolution, as opposed to learning is the key player.

    Short Bio:
    Dr Gaye Banfield has been involved in computing in one form or another for twenty-six years. She was awarded a Bachelor of Science from the University of Queensland in 1983 majoring in Computer Science with electives in Mathematics and Psychology. From 1983 to 2002 she has been employed in various I.T. roles and applications in manufacturing retail and finance. Her tasks have included critical analysis of documentation, data collection, statistical analysis and interpretation of information. In 1998 Gaye began a Master of Science in Computer Science at Birkbeck College part-time. She continued to work fulltime and study in the evenings. Her MSc thesis touched on her areas of interest on AI and Neural Networks. She graduated with a Master of Science in Computer Science in 2001 (Birkbeck, University of London). In 2006 she was awarded a PhD from Birkbeck College, University of London for her work on computational modelling of self control. Since then she has continued pursing her interest in Neural Networks specifically in the area of reinforcement learning and also in using computers in mathematical education.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Scheduling in Distributed Real-Time Systems Utilizing Imprecise Computations, ProfProf. Eleni D. Karatza (Aristotle University of Thessaloniki, Greece), Tuesday, May 12th, 2009, 11:00-12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Scheduling in Distributed Real-Time Systems Utilizing Imprecise Computations

    Speaker: ProfProf. Eleni D. Karatza
    Affiliation: Aristotle University of Thessaloniki, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, May 12th, 2009
    Time: 11:00-12:00 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.karatza

    Abstract:
    Distributed real-time systems are very important in our daily life as most of today?s applications require high quality results within precise timing constraints. In real-time systems the correctness of the system does not depend only on the logical results of the computations, but also on the time at which the results are produced. That is, the jobs in a real-time system have deadlines which must be met. If a real-time job cannot meet its deadline, then its results will be useless, or even catastrophic. Therefore, a real-time system must guarantee that every job will complete its execution before its deadline. Moreover, it must tolerate possible software faults that may cause failures during the execution of a job. Consequently, the most important aspect of a distributed real-time system is the scheduling algorithm which decides the allocation of processors to jobs and also the order in which jobs will be executed on processors. One of the techniques that have been proposed by researchers for the scheduling of real-time jobs is called imprecise computations. This is the case where the execution of a real-time job is allowed to return intermediate (imprecise) results of poorer, but still acceptable quality, when the deadline of the job cannot be met. In a distributed real-time system, jobs usually consist of frequently communicating tasks which can be processed in parallel. An efficient way to schedule dynamic, parallel jobs is gang scheduling. With this technique, parallel job tasks are scheduled and executed simultaneously on different processors. Jobs of this type are called gangs. In this talk we present issues related to the performance of scheduling algorithms for gangs in distributed real-time systems, where transient software faults may cause failures during the execution of a job. Particularly, the imprecise computations technique is discussed and the advantages of incorporating this technique into the scheduling process are presented.

    Short Bio:
    Eleni D. Karatza is an Associate Professor in the Department of Informatics, at the Aristotle University of Thessaloniki, Greece. Her research interests include Computer Systems Modeling and Simulation, Performance Evaluation of Parallel and Distributed systems, Resource Allocation and Scheduling, Cluster Computing, Grid Computing and Resource Discovery in the Grid. Dr. Karatza has authored or co-authored over 130 technical papers and book chapters including two papers that earned best paper awards at the 39th Annual Simulation Symposium (ANSS 2006) and the 10th International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS 2007) respectively. Dr. Karatza is Editor in Chief of Simulation Modelling Practice and Theory (Elsevier), Area Editor of the Journal of Systems and Software (Elsevier), Associate Editor of the International Journal of Communication Systems (Wiley), Associate Editor of the ACM Transactions on Modeling and Computer Simulation, Associate Editor of the International Journal of Simulation and Process Modelling (Inderscience Publishers), Editorial Board Member of the International Journal of Communication Networks and Distributed Systems (Inderscience Publishers), Editorial Board Member of the International Journal of Simulation: Systems, Science & Technology (The UK Simulation Society), Editorial Advisory Board Member in the Book Series: Emerging Communication and Service Technologies (Troubador Publishing Ltd) and Advisory Editorial Board Member of Simulation: Transactions of The Society for Modeling and Simulation International (Sage Publications). Dr. Karatza is a Senior member of the IEEE, and of the Society for Modeling and Simulation International (SCS).

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: On Two Network Measurement Problems: Inferring Autonomous System Relationships and Computing Network Traffic Heavy Hitters, Dr. Xenofontas Dimitropoulos (ETH Zurich, Switzerland), Monday, May 11th, 2009, 11:00 - 12:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    On Two Network Measurement Problems: Inferring Autonomous System Relationships and Computing Network Traffic Heavy Hitters

    Speaker: Dr. Xenofontas Dimitropoulos
    Affiliation: ETH Zurich, Switzerland
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Monday, May 11th, 2009
    Time: 11:00 - 12:00 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.dimitropoulos

    Abstract:
    Contractual relationships between Autonomous Systems (AS) affect inter-domain packet routing and shape the evolution and properties of the global AS-level topology of the Internet. In this talk, I will first describe the problem of inferring AS relationships and then will introduce novel inference heuristics finding customer-to-provider, peer-to-peer, and sibling-to-sibling relationships. I will outline validation results based on a survey with network operators showing inference accuracy between 82.8% and 96.5%. Finally, I will discuss an AS relationships repository we have opened to make our results useful for the community where we archive periodically the Internet AS-level topology annotated with inferred AS relationships. In the second part of the talk, I will switch to discussing the problem of computing network traffic heavy hitters using limited memory resources. I will briefly introduce the IBM Aurora system, which provides the context of our interest and then I will present an algorithm called Probabilistic Lossy Counting (PLC) for finding network traffic heavy hitters. PLC enhances the well-known lossy counting algorithm using on a tighter error bound on the estimated sizes of traffic flows providing probabilistic rather than deterministic guarantees on its accuracy. Performance comparison experiments show that PLC has between 34.4% and 74% lower memory consumption and between 37.9% and 40.5% fewer false positives than other state-of-the-art algorithms.

    Short Bio:
    Xenofontas Dimitropoulos is a Senior Researcher in the Communication Systems Group (CSG) of ETH and an Associate Tutor in the Open University of Cyprus (OUC). He received a PhD degree in Electrical and Computer Engineering from Georgia Tech. In the past, he was a post-doc in the IBM Zurich Research Laboratory, where he worked in the IBM Aurora traffic flow collector project (now part of the IBM Tivoli suite), and a visiting scholar in the Cooperative Association for Internet Data Analysis (CAIDA). His research interests focus on traffic flow measurements, inter-domain routing, and network simulation. He has had various honors, like leading the graduation oath in his BSc degree for the highest GPA, a Fulbright scholarship, a Marie Curie scholarship, a best paper award, and a best paper nomination.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Advancing Computational Science and Engineering (with applications to chemical and molecular physics), Prof. Thom H. Dunning, Jr. (Director of NCSA, University of Illinois at Urbana-Champaign, USA), Wednesday, April 29th, 2009, 16:30 - 17:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Advancing Computational Science and Engineering (with applications to chemical and molecular physics)

    Speaker: Prof. Thom H. Dunning, Jr.
    Affiliation: Director of NCSA, University of Illinois at Urbana-Champaign, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, April 29th, 2009
    Time: 16:30 - 17:30 EET
    Host: Constantia M. Alexandrou (alexand AT ucy.ac.cy) / Pedro Trancoso (pedro AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.jr.

    Abstract:
    Advancing computational science and engineering requires progress along many axes, from the development of the underlying theories and models to the development of new algorithms and computational applications to the validation of the new theories and models. During the past two decades, chemical physicists have made dramatic advances in their ability to predict the structures, states, energetics and reactivities of molecules. However, advances are still needed: hypervalent molecules present conceptual, if not computational, difficulties and the new generation of multicore and many-core processors, especially as embodied in the coming generation of petascale computers, provide new opportunities but present new challenges as well. We will explore these issues in the seminar.

    Short Bio:
    Thom H. Dunning, Jr., is the director of the National Center for Supercomputing Applications as well as the Institute for Advanced Computing Applications and Technologies and a professor in the Department of Chemistry at the University of Illinois at Urbana-Champaign. Before joining Illinois, he was the founding director of the Joint Institute for Computational Sciences in Oak Ridge, Tennessee, a distinguished scientist in computing and computational sciences at Oak Ridge National Laboratory, and a distinguished professor at the University of Tennessee at Knoxville. Prior to moving to Tennessee, Dr. Dunning was responsible for supercomputing and networking for the University of North Carolina System and was a professor of chemistry at the University of North Carolina at Chapel Hill. Preceding the above academic appointments, Dr. Dunning spent 27 years as a staff member and research director in the Department of Energy's national laboratories (Los Alamos National Laboratory, Argonne National Laboratory, and Pacific Northwest National Laboratory). He then spent two years in DOE's Office of Science as Assistant Director for Scientific Simulation, where he initiated the Scientific Discovery through Advanced Computing (SciDAC) program. Dr. Dunning received his bachelor's degree in chemistry from the Missouri University of Science & Technology (1965) and his doctorate in chemistry/chemical physics from the California Institute of Technology (1970). He has written nearly 150 scientific publications on topics ranging from advanced computational techniques for molecular calculations to computational studies of the spectroscopy of high-power lasers and the chemical reactions involved in combustion. Dr. Dunning is a fellow of the American Physical Society and the American Association for the Advancement of Science and received the E. O. Lawrence Award in 1997 and DOE's Distinguished Associate Award in 2001.

    Note:
    Lecture in PDF: http://www.cs.ucy.ac.cy/colloquium/lectures/dunning09-colloquium.pdf

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: The New Opportunities and Challenges of Parallelism, Prof. Lawrence Snyder (University of Washington, USA), Wednesday, April 8th, 2009, 15:00 - 16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    The New Opportunities and Challenges of Parallelism

    Speaker: Prof. Lawrence Snyder
    Affiliation: University of Washington, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Wednesday, April 8th, 2009
    Time: 15:00 - 16:00 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.snyder

    Abstract:
    The fastest computer in the world has achieved a speed of 10^15 floating point operations per second; all desktop and laptop computers sold today are parallel computers. What programming techniques can be used to effectively translate the potential parallelism in a computation to these kinds of computers? Will one language work for both situations? Should all programmers be parallel programmers? The lecture discusses answers to these questions as well as other urgent problems in parallel computation.

    Short Bio:
    Lawrence Snyder is a professor of Computer Science and Engineering at the University of Washington in Seattle. He received a BA from the University of Iowa in Mathematics and Economics, and his PhD from Carnegie Mellon University as a student of A. Nico Habermann. He has served on the faculties of Yale and Purdue, and has had visiting appointments at UW, Harvard, MIT, Sydney University, The Swiss Technological University (ETH), The University of Auckland and Kyoto University. Throughout most of his career Snyder's research has focused on parallel computation, including architecture, algorithms and languages. In 1980 he invented programmable interconnect, a method to dynamically configure on-chip components, and a technology used today for FPGAs. In 1990 he was co-designer of Chaos Router, a randomizing adaptive packet router. He was principle investigator of the ZPL language design project, the first high-level parallel language to achieve "performance portability" across all parallel computer platforms. Snyder is author of Fluency with Information Technology: Skills, Concepts and Capabilities, a textbook for non-techie college freshmen that teaches fundamental computing concepts; the book is in its 3rd edition. With former PhD student Calvin Lin (UT Austin), he has written Principles of Parallel Programming, published in 2008. In service, Snyder was a three-term member of the Computer Research Association Board of Directors, developing a series of best practices white papers. He chaired the NSF CISE Advisory Board as well as several CISE directorate oversight panels and numerous review panels. He has chaired two National Research Council studies, producing influential reports -- Academic Careers for Experimental Computer Scientists and Engineers and Being Fluent with Information Technology; he served three terms on NRC's Army Research Lab Technical Advisory Board. He serves on ACM's Education Board, has been general chair or program committee chair of several ACM and IEEE conferences. He is a fellow of both the ACM and IEEE. His most important and rewarding accomplishment has been as adviser to 21 doctoral students. Lawrence Snyder will be a short term visiting professor at the Department of Computer Science, University of Cyprus, during Spring 2008-2009.

    Note:
    Additional Lectures by Prof. Snyder: Thursday, April 9th, 2009 (15:00-17:00), Room 148, a) 35 Years of Research: Positive Results; Negative Results ii) A Model of Parallelism To Guide Thinking Friday, April 10, 2009 (16:30-18:30), Room 148, a) Parallel Languages of Today -- OpenMP to Fortress; b) Next Parallel Languages -- Access To Parallelism For All http://www.cs.ucy.ac.cy/colloquium/lectures/snyder-lecture2.pdf http://www.cs.ucy.ac.cy/colloquium/lectures/snyder-lecture1.pdf http://www.cs.ucy.ac.cy/colloquium/lectures/snyder-colloquium.pdf http://www.cs.ucy.ac.cy/colloquium/lectures/snyder09.pdf

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: System Architecture Implications of some Elementary Questions about m-learning, Prof. Thanasis Hadzilacos (Open University of Cyprus, Cyprus), Tuesday, April 7th, 2009, 15:00 - 16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    System Architecture Implications of some Elementary Questions about m-learning

    Speaker: Prof. Thanasis Hadzilacos
    Affiliation: Open University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, April 7th, 2009
    Time: 15:00 - 16:00 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.hadzilacos

    Abstract:
    What is m-learning about? Is it about delivering information on smaller screens via lesser bandwidth? Is it about giving just-on-time and just-acceptable education to those unfortunate ones outside a classroom, distant from their classmates and a 'real' teacher? We shall argue in this presentation that hardware, software and communication properties and restrictions -valid and important computer science and technology research issues as they may be- are incidental to the deeper problems and opportunities that m-learning presents. We shall argue that m-learning provides an opportunity to bridge a classic gap in education, that between "library learning" and "field learning", a gap as old as the written word. "Content" is to education as "instruments" is to music: essential, indispensable, but a far cry from being the whole. Learning is not information presentation. An architecture for m-learning should be conceived and designed around complex learners' educational activities and not around content browsing -a vital but very simple learning activity. We shall discuss architectural issues and propose an architecture based on constructive m-learning activities. Is context awareness a desirable characteristic, a necessary one, something already achieved, or a pie in the sky? Is 'context' a stand-alone concept or is it context dependent? Does 'context awareness' for m-learning systems simply mean 'learner location dependence'? We shall argue that there are indeed m-learning system architectural implications of context awareness which depend on the answer we give to such questions.

    Short Bio:
    Professor of Information Systems, Open University of Cyprus (http://www.ouc.ac.cy) academic director of the graduate program in Information Systems, 55 years old. Until September 2007 he was Dean of the School of Science and Technology at the Hellenic Open Univer-sity (HOU, http://www.eap.gr) where he served (2000-2007) as associate professor of Software Engineering, directed (2003-2007) the Open and Distance Laboratory for Educational Material and Educational Methodology, the graduate course on Information Systems (2003-2007) and the undergraduate Computer Science course (2001-2003). Educated at Harvard, USA (1971-76), he had substantial industrial experience before joining Computer Technology Institute (http://www.cti.gr) in 1986, where he continues as a researcher with the responsibility of the Educational Technology and the e-Learning Sectors and R&D Unit III "Applied Information Systems" (http://www.cti.gr/RD3). He has taught at the Universities of Patras and Thessaly before joining the Hellenic Open University in 2000. During 1996-2001 he designed and managed the Greek national project "Odysseia" (http://odysseia.cti.gr/) for the utilization of Information and Communication Technologies in secondary education. He has served as a member of the Council of Europe working group for Teaching and Learning in the Communication Society (2002-2004) and the Greek national representative to E.U. DG Education and Culture for building the European portal on educational opportunities (2002-2005). He has published over 80 papers in international journals and conferences, including a chapter on "Teaching and Learning in the Communication Society" published by the Council of Europe. He has given over 60 invited talks and presentations in scientific conferences, training seminars, university seminars, and professional or technical events. He has coordinated, directed and participated in over 40 research and development projects funded by the European Commission (IST, Esprit, Brite-Euram, eContentplus, Lingua, Minerva, e-Learning), the three Community Support Framework Programs for Greece, private companies, the Greek Secretariat for R&D and the Greek Ministry of Education. His research interests are related to education and to large-scale information and database systems and in particular system design for non-standard application areas such as education, GIS, and multimedia. His real interest is people, and he is currently studying theology at HOU.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Small Sweeping 2NFAs Are Not Closed Under Complement, Dr. Christos Kapoutsis (University of Cyprus, Cyprus), Friday, April 3, 2009, 15:00 - 16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Small Sweeping 2NFAs Are Not Closed Under Complement

    Speaker: Dr. Christos Kapoutsis
    Affiliation: University of Cyprus, Cyprus
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Friday, April 3, 2009
    Time: 15:00 - 16:00 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.kapoutsis

    Abstract:
    Understanding the power of nondeterminism is one of the major goals of the theory of computation. The most important problem in this respect is the famous P vs NP question: does nondeterminism make a difference on Turing machines that use only "small" (i.e., polynomial) time? Another important problem is the L vs NL question: does nondeterminism make a difference on Turing machines that use only "small" (i.e., logarithmic) space? In 1978, Sakoda and Sipser proposed the following analogue to these questions: instead of full-fledged Turing machines, focus only on those which cannot write on their tape; instead of time or space, focus on size. That is: does nondeterminism make a difference on two-way finite automata that use only a "small" (i.e., polynomial) number of states? Also known as the 2D vs 2N question, where 2D (resp., 2N) is the class of problems that can be solved by small deterministic (resp., nondeterministic) two-way finite automata, this problem remains open. The conjecture is that indeed 2D and 2N are different. Given that 2D is closed under complement, one way to confirm the conjecture is to show that this closure fails for 2N; namely, that complementing a nondeterministic two-way finite automaton involves an exponential blow-up in the number of states, in general. In this colloquium, we will sketch a proof of this claim for the special case of automata that are sweeping, in the sense that they can change the direction of their head only at the two ends of the tape.

    Short Bio:
    Christos Kapoutsis began his graduate studies at MPLA, Athens and continued to receive his PhD from the MIT EECS Department in 2006, for work on the size complexity of finite automata. After two years as a postdoctoral researcher at the Chair for Information Technology and Education at ETH, he is now a visiting lecturer at the Department of Computer Science, University of Cyprus.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Particle Swarm Optimization in Dynamic Environments, Prof. Andries P. Engelbrecht (University of Pretoria, South Africa), Tuesday, March 17th, 2009, 15:00 - 16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Particle Swarm Optimization in Dynamic Environments

    Speaker: Prof. Andries P. Engelbrecht
    Affiliation: University of Pretoria, South Africa
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Tuesday, March 17th, 2009
    Time: 15:00 - 16:00 EET
    Host: Andreas Pitsillides (Andreas.Pitsillides AT ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.engelbrecht

    Abstract:
    The original particle swarm optimization (PSO) algorithms have been developed to solve unconstraint, static continuous-valued optimization problems. Due to the characteristics of PSO, it cannot be applied to find solutions in dynamically changing environments. The PSO approach has to be adapted in order to inject diversity into swarms such that the exploration abilities of the swarm are increased. This then allows PSO to find and track optima in dynamic environments. This talk will start by formally defining dynamic environments and discussing different classes of dynamic environments, as well as classes of dynamic optimization problems. Then an introduction to PSO will be provided, with an explanation of why the original PSO cannot be used in dynamic environments. Adaptations of PSO to find and track single solutions in dynamic, single objective, and unconstrained environments will then be discussed. The talk will then continue to discuss more complex dynamic optimization problems. It will be shown how PSO can be adapted to track multiple solutions in a dynamic environment, and results will be given to illustrate the performance of PSO in this task. Dynamic multi-objective optimization problems will be considered, discussing how a vector-evaluated PSO can be used to solve dynamic multi-objective optimization problems. Finally, the ability of PSO to cluster temporal data will be illustrated.

    Short Bio:
    Andries Engelbrecht is a professor in Computer Science at the University of Pretoria, South Africa. He also holds the position as South African Research Chair in Artificial Intelligence, and leads the Computational Intelligence Research Group at the University of Pretoria, consisting of 50 Masters and PhD students. He obtained his Masters and PhD degrees in Computer Science from the University of Pretoria in 1994 and 1999 respectively. His research interests include swarm intelligence, evolutionary computation, artificial neural networks, artificial immune systems, and the application of these CI paradigms to data mining, games, bioinformatics, and finance. He has published over 130 papers in these fields in journals and international conference proceedings, and is the author of the two books, "Computational Intelligence: An Introduction" and "Fundamentals of Computational Swarm Intelligence". In addition to these, he is a co-editor of the upcoming books, "Applied Swarm Intelligence" and "Foundations on Computational Intelligence". He is very active in the international community, annually serving as a reviewer for over 20 journals and 10 conferences. He is an associate-editor of the IEEE Transactions on Evolutionary Computation, Journal of Swarm Intelligence, and the recent IEEE Transactions on Computational Intelligence and AI in Games. Additionally, he serves on the editorial board of 3 other international journals, and is co-guest-editor of special issues of the IEEE Transactions on Evolutionary Computation and the Journal of Swarm Intelligence. He served on the international program committee and organizing committee of a number of conferences, organized special sessions, presented tutorials, and took part in panel discussions. As member of the IEEE CIS, he is a member of the Games technical committee and chair of its Swarm Intelligence for Games task force. He also serves as a member of the Computational Intelligence and Machine Learning Virtual Infrastructure Network. Andries Engelbrecht will be a short term visiting professor at the Department of Computer Science, University of Cyprus, during Spring 2008-2009.

    Note:
    Additional Lectures by Prof. Engelbrecht: Monday, March 16th, 2009, (13:30 - 14:45), Room 148, Angle Modulation as An Approach to Optimize Binary-Valued Problems http://www.cs.ucy.ac.cy/colloquium/lectures/engelbrecht09.pdf

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Neural Network Applications for Face Images Interpretation and Reconstruction, Dr. Chrisina Draganova (University of East London, UK), Thursday, March 12th, 2009, 13:30 - 14:45 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Neural Network Applications for Face Images Interpretation and Reconstruction

    Speaker: Dr. Chrisina Draganova
    Affiliation: University of East London, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus (map, directions)
    Date: Thursday, March 12th, 2009
    Time: 13:30 - 14:45 EET
    Host: Chris Christodoulou (cchrist AT ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.draganova

    Abstract:
    In this presentation we discuss the use of Neural Network based methods for three applications related to processing facial information. The first application aims to design neural network based classifiers that accept low dimensional representations of unseen images and produce an estimate of the age of the person in the corresponding face images. Supervised and unsupervised neural networks are tested. The results are compared with results obtained with other existing classifiers. Finally a comparison with human performance in the task of age estimation is presented. The second application investigates the use of neural network based methods for learning the relationship between certain facial attributes and a coded representation of face images. We then use the resulting neural networks for the synthesis of face images with specific attributes.The third application addresses the problem of restoring the overall shape of faces given only the shape presentation of a small part of the face. The shape of a face is defined by a series of landmarks located on the face outline and on the outline of different facial features. We use of a number of methods including a method that utilizes a Hopfield neural network, a method that uses Multi-Layer Perceptron (MLP) neural network, a novel technique which combines Hopfield and MLP together, and a method based on associative search. These techniques could form the basis for developing face image processing systems capable of dealing with occluded faces.

    Short Bio:
    Chrisina has an MSc degree in Computing Science from Birkbeck College, University of London, an MSc degree in Mathematics and Informatics, and a Ph.D. degree in Applied Mathematics from Sofia University, Bulgaria. She has worked in a number of universities in the UK and Bulgaria including London Metropolitan University, South-Bank University, Kingston University, University College London and Veliko Turnovo University. At present, she is a Senior Lecturer at University of East London. Her research interests over the years have been in the areas of approximation and interpolation with spline functions, neural network applications and Internet Technologies.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Utility-based Adaptive Workflow Execution on the Grid, Dr. Kevin Lee (University of Manchester, UK), Wednesday, March 11th, 2009, 15:00 - 16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Utility-based Adaptive Workflow Execution on the Grid

    Speaker: Dr. Kevin Lee
    Affiliation: University of Manchester, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus, University of Cyprus (map, directions)
    Date: Wednesday, March 11th, 2009
    Time: 15:00 - 16:00 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.lee

    Abstract:
    Scientific workflow execution on distributed grid-based resources suffers from non-optimal execution due to the use of static upfront mapping and scheduling. In this talk we argue that adaptively mapping and scheduling workflows offers increased performance and better utilisation of grid resources. We Introduce a generic architecture we have built that can retrofit adaptive behaviour to previously non-adaptive systems. Adaptation is controlled through the use of stream query processing which aggregates and performs analysis of sensor data collected from the workflow execution. New schedules are generated whilst the workflows are executing using utility function optimisation which results in improved performance. The approach is evaluated with the Pegasus workflow management system which compiles, schedules and executes abstract workflows on grid resources. Multiple utility functions are compared to optimise for response time and profit based metrics for different numbers of workflows.

    Short Bio:
    Kevin Lee is a Postdoc Research Associate at the School of Computer Science, University of Manchester, UK. He received his PhD on Dynamic Programming Models for Network Processors from Lancaster University, UK in 2006. His research interests include grid-based workflow execution, adaptive systems and P2P network monitoring. He is currently working on optimising scienfic workflow execution on grid infrastructure through the use of stream query processing and the optimisation of utility functions.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Approximate pattern matching for OCR texts, Dr. Manolis Christodoulakis (University of East London, UK), Tuesday, March 10th, 2009, 15:00 - 16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Approximate pattern matching for OCR texts

    Speaker: Dr. Manolis Christodoulakis
    Affiliation: University of East London, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus, University of Cyprus (map, directions)
    Date: Tuesday, March 10th, 2009
    Time: 15:00 - 16:00 EET
    Host: Chris Christodoulou (cchrist AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.christodoulakis

    Abstract:
    The process of digitising old books and manuscripts is of immense importance to a variety of people, such as librarians, academics, publishers, etc. This task is achieved by scanning the documents and then performing Optical Character Recognition (OCR) to obtain text that can be stored, searched for, indexed etc. Quite often the original paper-copies of the publications are of poor print quality, leading to digital texts that contain errors. Consequently, any attempt for exact pattern matching will fail, and algorithms for approximate pattern matching must be used, where matches similar (rather than identical) to the pattern can be identified. There exist several different ways for defining text similarity, which however fail to incorporate the specific nature of errors that occur in OCR-texts. In this talk I will present a recently developed similarity measure that is specifically tailored for this purpose. In particular, it incorporates optical similarities of characters as well as matching combinations of characters to yield better approximate matching. Early implementations suggest that it is a promising method, and there is number of variants worth exploring in the future.

    Short Bio:
    Dr. Manolis Christodoulakis received his BSc from the Department of Computer Engineering and Informatics, University of Patras, and his PhD from the Department of Computer Science in King's College London. In the past, he has worked as a Research Associate and later as an External Lecturer in King's College. Since September 2007, he serves as a Lecturer in the Secure Systems and Software Development (SD) field, in the School of Computing, Information Technology & Engineering. His research interests include: design and analysis of combinatorial algorithms, sequence analysis (pattern matching, repetition finding etc.), computational biology/bioinformatics, and computational music analysis.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Implementing Feedback Control for Efficient Autonomic Solutions on the Grid, Dr. Rizos Sakellariou (University of Manchester, UK), Friday, February 27th, 2009, 15:00 - 16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Implementing Feedback Control for Efficient Autonomic Solutions on the Grid

    Speaker: Dr. Rizos Sakellariou
    Affiliation: University of Manchester, UK
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus, University of Cyprus (map, directions)
    Date: Friday, February 27th, 2009
    Time: 15:00 - 16:00 EET
    Host: Marios Dikaiakos (mdd AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.sakellariou

    Abstract:
    The talk will argue for the need to use autonomic computing techniques to improve performance in volatile environments such as those typically associated with Grids and large-scale distributed computing. The realization of autonomic computing is based on having a feedback loop that monitors the environment, makes assessments and acts if needed. Different approaches to implement this feedback loop, ranging from control theory to utility functions, will be discussed and illustrated with examples drawn from research in the context of a UK project.

    Short Bio:
    Rizos Sakellariou is a Senior Lecturer in the School of Computer Science of the University of Manchester. Before, he was with the Department of Computer Science, Rice University, where he was a member of the dHPF Compiler Group and was involved with the DARPA-funded project POEMS. He was also a Visiting Assistant Professor with the Department of Computer Science, University of Cyprus (Fall 1999), and also held visiting positions with the Department of Computer Science, University of Illinois at Urbana-Champaign (Summer 2000) and the Department of Computer Architecture, Universitat Politecnica de Catalunya (Fall 2002). His research interests fall in the area of High-Performance Parallel, Distributed and Grid Computing. For more information please visit: http://www.cs.man.ac.uk/~rizos/

    Note:
    Lecture in PDF: http://www.cs.ucy.ac.cy/colloquium/lectures/sakellariou09.pdf

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Adaptive Join Processing, Dr. Vasilis A. Vassalos (Athens Univ. of Economics and Business, Greece), Thursday, February 12th, 2009, 16:30 - 17:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Adaptive Join Processing

    Speaker: Dr. Vasilis A. Vassalos
    Affiliation: Athens Univ. of Economics and Business, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus, University of Cyprus (map, directions)
    Date: Thursday, February 12th, 2009
    Time: 16:30 - 17:30 EET
    Host: Demetris Zeinalipour (dzeina AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.vassalos

    Abstract:
    Adaptive join algorithms have recently attracted a lot of attention in emerging applications where data is provided by autonomous data sources through heterogeneous network environments. Their main advantage over traditional join techniques is that they can start producing join results as soon as the first input tuples are available, thus improving pipelining by smoothing join result production and by masking source or network delays. I will describe Double Index NEstedloops Reactive join (DINER), a new adaptive join algorithm for result rate maximization. DINER combines two key elements: an intuitive flushing policy that aims to increase the productivity of in-memory tuples in producing results during the online phase of the join, and a novel re-entrant join technique that allows the algorithm to rapidly switch between processing in-memory and disk-resident tuples, thus better exploiting temporary delays when new data is not available. I will present experimental results using real and synthetic data sets that show that DINER outperforms previous adaptive join algorithms in producing result tuples at a significantly higher rate, while making better use of the available memory.

    Short Bio:
    Prof. Vasilis Vassalos (PhD in CS, Stanford University, 2000) is an Associate Professor in the Department of Informatics at AUEB. His research is on infrastructure and algorithmic issues for the integration of data and Web services in different environments, including XML query processing, specification-driven interface generation, adaptive query processing, and query rewriting using views. He is also working on sensor data management. Vassalos is the recipient of numerous awards, including a Marie Curie Outgoing International Fellowship for 2007-2008, and has been Principal Investigator for 8 funded research and advanced development projects since his arrival at AUEB in 2004. He is the author of over 25 technical publications and two US patents. He is or has been a member of the Program Committees of numerous international conferences, including SIGMOD 2008 and VLDB 2007. He is the co-founder of software company Enosys Software (sold to BEA Systems in 2003), maker of the first XQuery-based data integration platform and XQuery engine. Before joining AUEB he was an Assistant Professor of Information Systems at the Stern School of Business at NYU.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Automatic Parallelization with Hybrid Analysis, Prof. Lawrence Rauchwerger (Texas AM University, Texas, USA), Friday, January 30th, 2009, 15:00 - 16:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Automatic Parallelization with Hybrid Analysis

    Speaker: Prof. Lawrence Rauchwerger
    Affiliation: Texas AM University, Texas, USA
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus, University of Cyprus (map, directions)
    Date: Friday, January 30th, 2009
    Time: 15:00 - 16:00 EET
    Host: Pedro Trancoso (pedro AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.rauchwerger

    Abstract:
    Hybrid Analysis (HA) is a compiler technology that can seamlessly integrate all static and run-time analysis of memory references into a single framework capable of generating sufficient information for most memory related optimizations. In this talk, we will present Hybrid Analysis as a framework to perform automatic parallelization of loops. For the cases when static analysis does not give conclusive results, we extract sufficient conditions which are then evaluated dynamically and can (in)validate the parallel execution of loops. The HA framework has been fully implemented in the Polaris compiler and has parallelized 22 benchmark codes with 99% coverage and speedups superior to the Intel Ifort compiler.

    Short Bio:
    Lawrence Rauchwerger is a Professor Computer Science and of Computer Engineering in the Department of Computer Science, Texas A&M University. He is also the co-Director of the Parasol Laboratory. He received an Engineer degree from the Polytechnic Institute Bucharest, a M.S. in Electrical Engineering from Stanford University and a Ph.D. in Computer Science from the University of Illinois at Urbana-Champaign. Since 1996 he has been on the faculty of the Department of Computer Science at Texas A&M where he co-founded the Parasol Lab. He has held Visiting Faculty positions at the University of Illinois at Urbana-Champaign, Bell Labs, IBM T.J. Watson Research Center, and INRIA FUTURS, Paris.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Towards Unified Mechanisms for Inter-Processor Communication, Prof. Manolis Katevenis (FORTH-ICS and Univ. of Crete, Greece), Friday, January 30th, 2009, 09:30 - 10:30 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Towards Unified Mechanisms for Inter-Processor Communication

    Speaker: Prof. Manolis Katevenis
    Affiliation: FORTH-ICS and Univ. of Crete, Greece
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus, University of Cyprus (map, directions)
    Date: Friday, January 30th, 2009
    Time: 09:30 - 10:30 EET
    Host: Yiannakis Sazeides (yanos AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.katevenis

    Abstract:
    Communication (both interprocessor and I/O), i.e. data movement, is at least as important as computation, especially in multiprocessors. To reduce latency, new architectures will need to bring the supporting hardware, i.e. the network interfaces (NI), close to each processor, hence at the same level as their caches. Both the cache controller and the NI move data, thus they can benefit from being merged together. Implicit communication occurs when we do not know in advance which input data will be needed, or who last modified them; cache coherence works well for such communication. Explicit communication is when the producer knows who the consumers will be, or when the consumer knows its input data set ahead of time. Cache prefetchers or remote DMA (RDMA) are effective transfer mechanisms for explicit communication; however, RDMA uses 3 to 5 times less packets for an equivalent transfer, thus saving a lot of energy. In the SARC project, we are designing CMP nodes where the local SRAM blocks of the processor are configurable as partly-cache and partly-scratchpad memory, and where the cache controller and network interface are merged together, thus unifying the hardware support for implicit and explicit communication.

    Short Bio:
    Manolis Katevenis received the Ph.D. degree from U.C.Berkeley in 1983 and the ACM Doctoral Dissertation Award in 1984 for his thesis on "Reduced Instruction Set Computer Architectures for VLSI". After a brief term on the faculty of Computer Science at Stanford University, he is in Greece, with the University of Crete and with FORTH, since 1986. After RISC, his research has been on interconnection networks and interprocessor communication. In packet switch architectures, his contributions since 1987 have been mostly in per-flow queueing, credit-based flow control, congestion management, weighted round-robin scheduling, buffered crossbars, and non-blocking switching fabrics. In multiprocessing and clustering, his contributions since 1993 have been on remote-write-based, protected, user-level communication.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



    Colloquium: Spatio-Temporal Memory Streaming, Prof. Babak Falsafi (EPFL, Switzerland.), Friday, January 23, 2009, 17:00 - 18:00 EET.


    The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

    Spatio-Temporal Memory Streaming

    Speaker: Prof. Babak Falsafi
    Affiliation: EPFL, Switzerland.
    Category: Colloquium
    Location: Room 148, Building 12 Faculty of Pure and Applied Sciences, New Campus, University of Cyprus (map, directions)
    Date: Friday, January 23, 2009
    Time: 17:00 - 18:00 EET
    Host: Pedro Trancoso (pedro AT cs.ucy.ac.cy)
    URL: http://www.cs.ucy.ac.cy/colloquium/index.php#cs.ucy.2009.falsafi

    Abstract:
    Device scaling in processor fabrication technologies along with microarchitectural innovation have led to a tremendous gap between processor and memory performance. While architects have primarily relied on deeper cache hierarchies to reduce this performance gap, the limited capacity in higher cache levels and simple data placement/eviction policies have resulted in diminishing returns for commercial workloads with large memory footprints and adverse access patterns. Moreover, proposals to bridge the gap using runahead execution or large instruction windows do not benefit workloads with little inherent memory-level parallelism such as transaction processing on databases or web servers. The STeMS (Spatio-Temporal Memory Streaming) project at EPFL is exploring memory system designs that exploit repetitive spatial and temporal correlation among memory accesses and construct memory streams that can be moved and managed together through the memory hierarchy to hide the long access latencies. In this talk, I will present: (a) results from offline trace analysis and cycle-accurate simulation showing that a large fraction of memory accesses in server workloads are spatially and/or temporally correlated, and (b) candidate STeMS architectures to exploit such correlation.

    Short Bio:
    Babak Falsafi is a Professor in the School of Computer and Communication Sciences at EPFL, and an Adjunct Professor of Electrical and Computer Engineering and Computer Science at Carnegie Mellon. He is the Microarchitecture thrust leader for the FCRP Center for Circuit and System Solutions and directs the Parallel Systems Architecture Laboratory (PARSA) at EPFL. His research targets architectural support for parallel programming, resilient systems, architectures to break the memory wall, and analytic and simulation tools for computer system performance evaluation. In 1999, in collaboration with T. N. Vijaykumar he showed for the first time that multiprocessors do not need relaxed memory consistency models to achieve high performance. He is a recipient of an NSF CAREER award in 2000, IBM Faculty Partnership Awards between 2001 and 2004, and an Alfred P. Sloan Research Fellowship in 2004. He is a senior member of IEEE and ACM.

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    Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft



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