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, Faculty of Pure and Applied Sciences (FST-01), 1 University Avenue, 2109 Nicosia, Cyprus (directions)
Date: Wednesday, October 30, 2013
Time: 10:30-11:30 EET
Host: Pedro Trancoso (

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.

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

  Mailing List:

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