Thursday, 30 July

8:30-9:00 Registration

9:00-9:15 Kick-off

9:15-10:15 Keynote talk

Nikos Mamoulis, University of Ioannina

Enriched Geo-Spatial Data Search and Analysis

The recent advances in technology has brought to availability huge volumes of new and complex forms of data. People routinely use smart devices with data collection capabilities and they are willing to post and share the data. New search and analysis tasks on the data are formed to serve the needs of common people or organizations and companies. For the last several years, our research deals with the search and analysis of geo-spatial data, which are enriched with or associated to additional types of information, such as textual annotations and social network semantics. One source of our data are points of interest on maps are enriched with tags, descriptions in web pages, and reviews by people who visit them. In this talk, I will present some of our results in this direction. The main focus will be applications that combine spatial data with either social semantics or textual content. Specific topics that will be discussed include location recommendation and clustering of places in geo-social networks, spatio-textual joins and skylines, and location-aware query suggestion.

10:15-10:45 Coffee break

10:45-12:30 Session 1: Cloud and distributed applications

Chair: Herodotos Herodotou

  • Scaling out big data missing value imputations: pythia vs. Godzilla. Christos Anagnostopoulos, University of Glasgow, Peter Triantafillou, University of Glasgow. [PDF]
  • PANIC: Modeling Application Performance over Virtualized Resources. Ioannis Giannakopoulos, CSLab, NTUA, Dimitrios Tsoumakos, Ionian University, Nikolaos Papailiou, NTUA, Nectarios Koziris, NTUA. [PDF]
  • Automated Workload-aware Elasticity of NoSQL Clusters in the Cloud. Evie Kassela, NTUA, Christina Boumpouka, Ioannis Konstantinou, Nectarios Koziris, NTUA. [PDF]
  • RadioMap Prefetching for Indoor Navigation in Intermittently Connected Wi-Fi Networks. Andreas Konstantinidis, University of Cyprus, Georgios Chatzimilioudis, University of Cyprus, Giannis Evagorou, Imperial College London, Demetris Zeinalipour, University of Cyprus, Panos Chrysanthis, University of Pittsburgh. [PDF]

12:30-14:00 Light lunch

14:00-15:30 Session 2: Demonstrations

Chair: Haridimos Kondylakis

  • IReS: Intelligent, Multi-Engine Resource Scheduler for Big Data Analytics Workflows. Katerina Doka, NTUA, Nikolaos Papailiou, NTUA, Dimitrios  Tsoumakos, Ionian University, Christos Mantas, NTUA, Nectarios Koziris, NTUA. [PDF]
  • MoDiSENSE: A Distributed Spatio-Temporal and Textual Processing Platform for Social Networking Services. Ioannis Mytilinis, NTUA, Ioannis Giannakopoulos, NTUA, Ioannis Konstantinou, Katerina Doka, NTUA, Dimitrios Tsitsigkos, Manolis Terrovitis, Lampros Giampouras, Nectarios Koziris, NTUA. [PDF]
  • CELAR: Managing and Deploying Elastic Cloud Applications. George Pallis, University of Cyprus, Marios Dikaiakos, University of Cyprus, Demetris Trihinas, University of Cyprus, Athanasios Foudoulis, University of Cyprus, Nicholas Loulloudes, University of Cyprus, Demetris Antoniades, University of Cyprus, Ioannis Konstantinou, National Technical University of Athens, Ioannis Giannakopoulos, National Technical University of Athens, Nikolaos Papailiou, National Technical University of Athens, Christos Mantas, National Technical University of Athens, Nektarios Koziris, National Technical University of Athens, Dimitrios Tsoumakos, Ionian University. [PDF]
  • CE-Storm: Confidential Elastic Processing of Data Streams. Nick Katsipoulakis, University of Pittsburgh, Cory Thoma, University of Pittsburgh, Eric Gratta, University of Pittsburgh, Alexandros Labrinidis, University of Pittsburgh, Adam Lee, University of Pittsburgh, Panos Chrysanthis, University of Pittsburgh [PDF]
  • Anyplace: A Crowdsourced Indoor Information Service. Kyriakos Georgiou, University of Cyprus, Timotheos Constambeys, University of Cyprus, Christos Laoudias, University of Cyprus, Lambros Petrou, University of Oxford, Georgios Chatzimilioudis, University of Cyprus, Demetris Zeinalipour, University of Cyprus. [PDF]

15:30-16:00 Coffee break

16:00-17:15 Session 3: Data analytics and privacy

Chair: George Papadakis

  • Query Analytics over Probabilistic Databases with Unmerged Duplicates. Ekaterini Ioannou, Technical University of Crete, Minos Garofalakis, Technical University of Crete. [PDF]
  • Network Analytics in Large Scale with Datix. Dimitrios Sarlis, NTUA, Nikolaos Papailiou, NTUA, Ioannis Konstantinou, Georgios Smaragdakis, MIT CSAIL, Nectarios Koziris, NTUA. [PDF]
  • Anonymizing Collections of Tree-Structured Data. Olga Gkountouna, NTUA, Manolis Terrovitis [PDF]

Friday 31 July

9:00-10:15 Session 4: RDF

Chair: Kostas Stefanidis

  • RDF Digest: Efficient Summarization of RDF/S KBs, Georgia Troullinou, ICS-FORTH, Haridimos Kondylakis, ICS-FORTH, Evangelia Daskalaki, ICS-FORTH, Dimitris Plexousakis, ICS-FORTH [PDF]
  • An Approach for the Incremental Export of Relational Databases into RDF Graphs, Nikolaos Konstantinou, NTUA, Dimitrios-Emmanuel Spanos, National Technical University of Athens, Dimitris Kouis, National Technical University of Athens, Nikolas Mitrou, National Technical University of Athens [PDF]
  • An Effective Encoding Scheme for Spatial RDF Data, John Liagouris, NTUA Nikos Mamoulis, HKU Panagiotis Bouros, Humboldt University Berlin, Manolis Terrovitis. [PDF]

10:15-10:45 Coffee break

10:45-12:00 Session 5: Queries processing and summaries

Chair: Dimitris Skoutas

  • Finding the Most Diverse Products using Preference Queries, Orestis Gkorgkas, NTNU, Akrivi Vlachou, Athens University of Economics and Business, Christos Doulkeridis, University of Pireaus, Kjetil Nørvåg, NTNU [PDF]
  • Diverse and Proportional Size-l Object Summaries for Keyword Search, Georgios Fakas, HKUST, Nikos Mamoulis, HKU [PDF]
  • Sketching Distributed Sliding-Window Data Streams, Odysseas Papapetrou, Technical University of Crete, Minos Garofalakis, TUC, Antonios Deligiannakis, Technical University of Crete [PDF]

12:00-13:30 Light lunch

13:30-14:45 Session 6:  Graphs and applications

Chair: George Papastefanatos

  • Pushing the Envelope in Graph Compression, Panagiotis Liakos, University of Athens, Katia Papakonstantinopoulou, University of Athens, Michael Sioutis, Université Lille-Node de France, CRIL-CNRS [PDF]
  • Focused Clustering and Outlier Detection in Large Attributed Graphs, Bryan Perozzi, Stony Brook University, Leman Akoglu, Stony Brook University, Patricia Iglesias Sánchez Karlsruhe Institute of Technology, Emmanuel Müller, Karlsruhe Institute of Technology [PDF]
  • Visual Maps for Data-Intensive Ecosystems, Efthymia Kontogiannopoulou, Petros Manousis, Panos Vassiliadis, Univ. Ioannina [PDF]

14:45-15:15 Coffee break

15:15-16:45 Session 7: Social networks

Chair: Manolis Terrovitis

  • Supervised Meta-blocking, George Papadakis, University of Athens, George Papastefanatos, IMIS, "Athena" RC, Georgia Koutrika, HP Labs [PDF]
  • Refining Social Graph Connectivity via Shortcut Edge Addition, Manos Papagelis, University of Toronto [PDF]
  • Real-Time Multi-Criteria Social Graph Partitioning: A Game Theoretic Approach, Nikos Armenatzoglou, HKUST, Huy Pham, USC, Vasilis Ntranos, USC, Dimitris Papadias, HKUST, Cyrus Shahabi, USC [PDF]
  • The Importance of Being Expert: Efficient Max-Finding in Crowdsourcing, Aris Anagnostopoulos,  Sapienza University of Rome, Luca Becchetti, Sapienza University of Rome, Adriano Fazzone, Sapienza University of Rome, Ida Mele, Max Planck Institute for Informatics, Matteo Riondato Stanford University [PDF]

17:00-18:00 Panel

“The Beckman Database Research Self-Assessment Meeting”

Panel chairs:

Yannis Ioannidis, University of Athens

Panagiotis Karras, Skolkovo Institute of Science and Technology


Demetris Zeinalipour, University of Cyprus

Herodotos Herodotou, Cyprus University of Technology

Alexandros Labrinidis, University of Pittsburgh

Peter Triantafillou, University of Glasgow

19:45 Social Dinner @ "Κήπος του Μουσείου", National Archeological Museum, 44 Patission street, Athens, tel: 2108833225