CS Other Presentations

Department of Computer Science - University of Cyprus

Besides Colloquiums, the Department of Computer Science at the University of Cyprus also holds Other Presentations (Research Seminars, PhD Defenses, Short Term Courses, Demonstrations, etc.). These presentations are given by scientists who aim to present preliminary results of their research work and/or other technical material. Other Presentations serve as a forum for educating Computer Science students and related announcements are disseminated to the Department of Computer Science (i.e., the csall list):
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Presentations Coordinator: Demetris Zeinalipour

PhD Defense: Online Social Networks Analysis: Extracting Insights and Evolution Trends, Mr. Hariton Efstathiades (University of Cyprus, Cyprus), Wednesday, March 28, 2018, 15:00-16:00 EET.

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

Online Social Networks Analysis: Extracting Insights and Evolution Trends

Speaker: Mr. Hariton Efstathiades
Affiliation: University of Cyprus, Cyprus
Category: PhD Defense
Location: Room 148, Faculty of Pure and Applied Sciences (FST-01), 1 University Avenue, 2109 Nicosia, Cyprus (directions)
Date: Wednesday, March 28, 2018
Time: 15:00-16:00 EET
Host: Dr. George Pallis (gpallis-AT-cs.ucy.ac.cy)
URL: https://www.cs.ucy.ac.cy/colloquium/presentations.php#cs.ucy.pres.2018.efstathiades

Online Social Networking (OSN) has became one of the main means of communication in our era. OSN platforms enable user to interact, express and share her opinions, feelings and interests with the outside world; her family, friends, colleagues, neighbors or even strangers. These interactions hide much more valuable information, as users can now act as broadcasters through their published messages in cases such as events and incidents detection, environmental analysis, social science investigations. Furthermore, the communities that are constructed in these platforms could potentially provide valuable information about the structure of our physical world networks. We first present a Distributed Large-Scale Dataset Collection Framework for OSN, which improves existing solutions by more than 3x. We then turn our attention on the identification of Users Key Locations in Online Social Networks presenting our methodology which not only outperforms state-of-the-art methods by at least 30% in terms of accuracy, but also cuts the detection radius at least at half the distance from other methods. Our awarded work on Twitter Evolution is introduced, where we compare the topology of Twitter in 2009 and 2015. Our results conclude to a denser network, showing an increase in the number of reciprocal edges, despite the fact that around 12.5% of the 2009 users have now left Twitter. However, the network’s largest strongly connected component seems to be significantly decreasing, suggesting a movement of edges towards popular users. Furthermore, we observe numerous changes in the lists of influential Twitter users, having several accounts that where not popular in the past securing a position in the top-20 list as new entries. The results on influential users in OSN trigger us to study a special category of workforce, Entrepreneurs. In specific, we analyze the sentiment of entrepreneurs in Twitter, and highlight the differences with the average user.

Short Bio:
Hariton Efstathiades is a PhD candidate at the Computer Science Department of University of Cyprus. He holds a Computer Science MSc with specialization in Web Information Systems from Delft University of Technology (TU Delft) and a Computer Science BSc degree from the University of Cyprus. Hariton held research appointments at the Laboratory for Internet Computing (LInC) of the University of Cyprus, Web Information Systems (WIS) group of Delft University of Technology, and Center for Advanced Studies (CAS) at IBM Benelux, Amsterdam. His research interests lie in the area of Big Data Analytics, Online Social Networks and Semantic Web analysis, Internet of things and Data Management. Hariton's work has been published in IEEE/ACM journals and conferences in the areas of OSN and Big Data analytics such as WWW, BigData, ASONAM, CIC, SNAM, MobiWis. His recent study on Twitter evolution won the best student paper award in IEEE Internation Conference on BigData 2016, Washington D.C.,USA. Hariton Efstathiades currently serves as Operations and Innovation Manager at Ygia Polyclinic Private Hospital, having as responsibility the optimization and digital transformation of the organization.

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