Publications

Books

V. Christophides, V. Efthymiou, and K. Stefanidis. Entity Resolution in the Web of Data. Synthesis Lectures on The Semantic Web: Theory and Technology, Morgan and Claypool, August 2015.

Journals

V. Efthymiou, G. Papadakis, G. Papastefanatos, K. Stefanidis and T. Palpanas. Parallel Meta-blocking for Scaling Entity Resolution over Big Heterogeneous Data. Elsevier Information Systems (IS), vol. 65, 2017. [Local copy]

V. Efthymiou, K. Stefanidis and V. Christophides. Benchmarking Blocking Algorithms for Web Entities. IEEE Transactions on Big Data. In press. [Local copy]

K. Stefanidis, E. Ntoutsi, M. Petropoulos, K. Norvag, and H-P. Kriegel. A Framework for Modeling, Computing and Presenting Time-aware Recommendations. Transactions on Large-Scale Data- and Knowledge-Centered Systems (TLDKS Journal), Lecture Notes in Computer Science, vol. 8820, pp. 146-172, 2013. Springer. [Local copy]

K. Stefanidis, G. Koutrika and E. Pitoura. A Survey on Representation, Composition and Application of Preferences in Database Systems. ACM Transactions on Database Systems (TODS), vol. 36, no. 3, 2011. [Local copy]

K. Stefanidis, E. Pitoura and P. Vassiliadis. Managing Contextual Preferences. Information Systems, vol. 36, no. 8, pp. 1158-1180, 2011. Elsevier Science Ltd. [Local copy]

E. Pitoura, K. Stefanidis and P. Vassiliadis. Contextual Database Preferences. IEEE Data Engineering Bulletin, vol. 34, no. 2, pp. 19-25, 2011. IEEE Computer Society. [Local copy]

K. Stefanidis, E. Pitoura and P. Vassiliadis. A Context-Aware Preference Database System. International Journal of Pervasive Computing and Communications, vol. 3, no. 4, pp. 439-460, 2007. Emerald Group Publishing Limited. [Local copy]

Book Chapters

K. Stefanidis, E. Ntoutsi, H. Kondylakis and Y. Velegrakis. Social-based Collaborative Filtering. In Encyclopedia of Social Network Analysis and Mining, Springer, 2017. [Local copy]

G. Koloniari, P. Lionakis and K. Stefanidis. Social Search and Querying. In Encyclopedia of Social Network Analysis and Mining, Springer, 2017. [Link]

G. Koutrika, E. Pitoura and K. Stefanidis. Preference-based Query Personalization. In B. Catania, L. Jain (eds.), Advanced Query Processing, Springer. April 2012.

Conferences and Workshops

P. Fafalios, V. Iosifidis, K. Stefanidis and E. Ntoutsi. Multi-aspect Entity-centric Analysis of Big Social Media Archives. Proceedings of TPDL 2017. [Local copy]

V. Papakonstantinou, G. Flouris, I. Fundulaki, K. Stefanidis and G. Roussakis. SPBv: Benchmarking Linked Data Archiving Systems. Proceedings of the Workshop on Benchmarking Linked Data (BLINK) @ ISWC 2017. [Local copy]

M. Kyriakidi, K. Stefanidis and Y. Ioannidis. On Achieving Diversity in Recommender Systems. Proceedings of ExploreDB @ SIGMOD 2017. [Local copy]

K. Stefanidis, V. Christophides and V. Efthymiou. Web-scale Blocking, Iterative and Progressive Entity Resolution. Proceedings of ICDE 2017. [Local copy]

M. Stratigi, H. Kondylakis and K. Stefanidis. Fairness in Group Recommendations in the Health Domain. Proceedings of HDMM @ ICDE 2017. [Local copy]

K. Stefanidis, H. Kondylakis and G. Troullinou. On Recommending Evolution Measures: A Human-aware Approach. Proceedings of DESWeb @ ICDE 2017. [Local copy]

V. Efthymiou, P. Zervoudakis, K. Stefanidis and D. Plexousakis. Group Recommendations in MapReduce. Proceedings of the IC-ININFO 2016. [Local copy]

V. Papakonstantinou, G. Flouris, I. Fundulaki, K. Stefanidis and G. Roussakis. Versioning for Linked Data: Archiving Systems and Benchmarks. Proceedings of the Workshop on Benchmarking Linked Data (BLINK) @ ISWC 2016. [Local copy]

E. Ntoutsi and K. Stefanidis. Recommendations beyond the Ratings Matrix. Proceedings of the Data-Driven Innovation Workshop @ Web Science 2016. [Local copy]

V. Efthymiou, K. Stefanidis and V. Christophides. Minoan ER: Progressive Entity Resolution in the Web of Data. Proceedings of EDBT 2016. [Local copy]

K. Stefanidis and E. Ntoutsi. Cluster-based Contextual Recommendations. Proceedings of EDBT 2016. [Local copy]

G. Troullinou, Y. Roussakis, H. Kondylakis, K. Stefanidis and G. Flouris. Understanding Ontology Evolution Beyond Deltas. Proceedings of EDBT/ICDT Workshops 2016. [Local copy]

V. Efthymiou, K. Stefanidis and V. Christophides. Big Data Entity Resolution: From Highly to Somehow Similar Entity Descriptions in the Web. Proceedings of IEEE BigData 2015. [Local copy]

V. Efthymiou, G. Papadakis, G. Papastefanatos, K. Stefanidis and T. Palpanas. Parallel Meta-blocking: Realizing Scalable Entity Resolution over Large, Heterogeneous Data. Proceedings of IEEE BigData 2015. [Local copy]

V. Efthymiou, K. Stefanidis and E. Ntoutsi. Top-k Computations in MapReduce: A Case Study on Recommendations. Proceedings of IEEE BigData 2015. [Local copy]

Y. Roussakis, I. Chrysakis, K. Stefanidis, G. Flouris and Y. Stavrakas. A Flexible Framework for Understanding the Dynamics of Evolving RDF Datasets. Proceedings of ISWC 2015. [Local copy]
best student paper award

Y. Roussakis, I. Chrysakis, K. Stefanidis and G. Flouris. D2V: A Tool for Defining, Detecting and Visualizing Changes on the Data Web. Proceedings of ISWC 2015. (Demo Paper) [Local copy]

K. Stefanidis and I. Fundulaki. Keyword Search on RDF Graphs: It is more than just searching for keywords. Proceedings of ESWC 2015. [Local copy]

I. Ntoutsi, K. Stefanidis, K. Rausch and H. P. Kriegel. "Strength Lies in Differences" - Diversifying Friends for Recommendations through Subspace Clustering. Proceedings of CIKM 2014. [Local copy]

G. Koutrika, L. V. S. Lakshmanan, M. Riedewald and K. Stefanidis. Exploratory Search in Databases and the Web. Proceedings of EDBT/ICDT Workshops 2014.

N. Louloudakis, V. Theodosiadis, H. Kondylakis and K. Stefanidis. NaviSoc: A Socially Enhanced Real-time Navigator. Proceedings of Basna 2014, in conjunction with ICDM 2014. [Local copy]

K. Stefanidis and G. Koloniari. Enabling Social Search in Time through Graphs. Proceedings of Web-KR 2014, in conjunction with CIKM 2014. [Local copy]

K. Stefanidis, V. Efthymiou, M. Herschel and V. Christophides. Entity Resolution in the Web of Data (tutorial). Proceedings of WWW 2014. [Short description]

K. Stefanidis, I. Chrysakis and Giorgos Flouris. On Designing Archiving Policies for Evolving RDF Datasets on the Web. Proceedings of ER 2014. [Local copy]

P. Lionakis, K. Stefanidis and G. Koloniari. SQTime: Time-enhanced Social Search Querying. Proceedings of ER 2014. (Demo Paper) [Local copy]

K. Rausch, I. Ntoutsi, K. Stefanidis and H. P. Kriegel. Exploring Subspace Clustering for Recommendations. Proceedings of SSDBM 2014. [Local copy]

A. Zamansky, O. Arieli and K. Stefanidis. Context-aware Distance Semantics for Inconsistent Database Systems. Proceedings of IPMU 2014. [Local copy]

K. Stefanidis, V. Efthymiou, M. Herschel and V. Christophides. Entity Resolution in the Web of Data (tutorial). Proceedings of CIKM 2013. [Short description]

O. Gkorgkas, K. Stefanidis and K. Norvag. A Framework for Grouping and Summarizing Keyword Search Results. Proceedings of ADBIS 2013. [Local copy]

G. Koloniari and K. Stefanidis. Social Search Queries in Time. Proceedings of PersDB 2013, in conjunction with VLDB 2013. [Local copy]

I. Ntoutsi, K. Stefanidis, K. Norvag and H. P. Kriegel. Fast Group Recommendations by Applying User Clustering. Proceedings of ER 2012. [Local copy]

K. Stefanidis, N. Shabib, K. Norvag and J. Krogstie. Contextual Recommendations for Groups. Proceedings of NoCoDA 2012, in conjunction with ER 2012. [Local copy]

K. Stefanidis and E. Pitoura. Finding the Right Set of Users: Generalized Constraints for Group Recommendations. Proceedings of PersDB 2012, in conjunction with VLDB 2012. [Local copy]

K. Stefanidis, I. Ntoutsi, K. Norvag and H. P. Kriegel. A Framework for Time-aware Recommendations. Proceedings of DEXA 2012. [Local copy]

I. Ntoutsi, K. Stefanidis, K. Norvag and H. P. Kriegel. gRecs: A Group Recommendation System based on User Clustering. Proceedings of DASFAA 2012. (Demo Paper) [Local copy]

Y. Tao, S. Papadopoulos, C. Sheng and K. Stefanidis. Nearest Keyword Search in XML Documents. Proceedings of SIGMOD 2011. [Local copy]

K. Stefanidis, M. Drosou and E. Pitoura. PerK: Personalized Keyword Search in Relational Databases. Proceedings of EDBT 2010. [Local copy]

G. Koutrika, E. Pitoura and K. Stefanidis. Representation, Composition and Application of Preferences in Databases (tutorial). Proceedings of ICDE 2010.

D. Souravlias, M. Drosou, K. Stefanidis and E. Pitoura. On Novelty in Publish/Subscribe Delivery. Proceedings of DBRank 2010, in conjunction with ICDE 2010. [Local copy]

E. Koletsou, K. Stefanidis, M. Drosou and E. Pitoura. YMAL: A Recommendation System for Relational Databases. Proceedings of HDMS 2010. (Demo Paper)

M. Drosou, K. Stefanidis and E. Pitoura. Preference-Aware Publish/Subscribe Delivery with Diversity. Proceedings of DEBS 2009. [Local copy]

K. Stefanidis, M. Drosou and E. Pitoura. "You May Also Like" Results in Relational Databases. Proceedings of PersDB 2009, in conjunction with VLDB 2009. [Local copy]

K. Stefanidis and E. Pitoura. Fast Contextual Preference Scoring of Database Tuples. Proceedings of EDBT 2008. [Local copy]

M. Drosou, E. Pitoura and K. Stefanidis. Preferential Publish/Subscribe. Proceedings of PersDB 2008, in conjunction with VLDB 2008. [Local copy]

K. Stefanidis, E. Pitoura and P. Vassiliadis. Adding Context to Preferences. Proceedings of ICDE 2007. [Local copy]

K. Stefanidis and E. Pitoura. Approximate Contextual Preference Scoring in Digital Libraries. Proceedings of PersDL 2007, in conjunction with UM 2007. [Local copy]

K. Stefanidis, E. Pitoura and P. Vassiliadis. On Relaxing Contextual Preference Queries. Proceedings of MCISME 2007, in conjunction with MDM 2007. [Local copy]

K. Stefanidis, E. Pitoura and P. Vassiliadis. Modeling and Storing Context-Aware Preferences. Proceedings of ADBIS 2006. [Local copy]

K. Stefanidis, E. Pitoura and P. Vassiliadis. On Supporting Context-Aware Preferences in Relational Database Systems. Proceedings of MCMP 2005, in conjunction with MDM 2005. [Local copy]

Invited Talks

Kostas Stefanidis, reporting on joint work with Vassilis Christophides and Vasilis Efthymiou. Blocking for Entity Resolution in the Web of Data: Challenges and Algorithms. 6th International Conference on Integrated Information (IC-ININFO 2016), September 19-22, 2016, Athens, Greece. [Local copy]

Tutorials

Web-scale Blocking, Iterative and Progressive Entity Resolution. At the 2017 IEEE International Conference on Data Engineering (ICDE 2017), April 19-22, San Diego, California, USA (with Vassilis Christophides and Vasilis Efthymiou). [Description]

Improving Quality and Scalability in Semantic Data Management. In the 13th Extended Semantic Web Conference (ESWC 2016), May 29 - June 2, Heraklion, Greece (with V. Christophides, O. Corcho, V. Efthymiou, V. Ermolayev, A. Harth, L.D. Ibanez, N. Keberle, I. Tachmazidis). [Description]

Seminar on Recommender Systems. In the 3rd MUMIA Training School on Information Retrieval and Interactive Information Access (MUMIA 2014), July 21 - 25, Heraklion, Crete. [Local copy]

Entity Resolution in the Web of Data. In the 23rd International World Wide Web Conference (WWW 2014), April 7 - 11, 2014, Seoul, Korea (with Vasilis Efthymiou, Melanie Herschel and Vassilis Christophides). [short description, Part I, Part II]

Entity Resolution in the Web of Data. In the 22nd International Conference on Information and Knowledge Management (CIKM 2013), October 27 - November 1, 2013, Burlingame, California, USA (with Vasilis Efthymiou, Melanie Herschel and Vassilis Christophides). [short description, Part I, Part II]

Representation, Composition and Application of Preferences in Databases. In the 26th International Conference on Data Engineering (ICDE 2010), March 1-6, 2010, Long Beach, California, USA (with Evaggelia Pitoura and Georgia Koutrika). [Local copy]

National Conferences

Y. Roussakis, I. Chrysakis, K. Stefanidis, G. Flouris and Y. Stavrakas. A Flexible Framework for Understanding the Dynamics of Evolving RDF Datasets. Proceedings of HDMS 2016.

K. Rausch, I. Ntoutsi, K. Stefanidis and H. P. Kriegel. Exploring Subspace Clustering for Recommendations. Proceedings of HDMS 2014.

I. Ntoutsi, K. Stefanidis, K. Norvag and H. P. Kriegel. gRecs: A Collaborative Filtering Framework for Group Recommendations. Proceedings of GfKl 2012. Abstract

K. Stefanidis, M. Drosou and E. Pitoura. PerK: Personalized Keyword Search in Relational Databases. Proceedings of HDMS 2010.

M. Drosou, K. Stefanidis and E. Pitoura. Preference-Aware Publish/Subscribe Delivery with Diversity. Proceedings of HDMS 2009. Abstract (in Greek).

K. Stefanidis and E. Pitoura. Fast Contextual Preference Scoring of Database Tuples. Proceedings of HDMS 2008. [Local copy]

K. Stefanidis, E. Pitoura and P. Vassiliadis. Preference Queries in Context: An Overview. Proceedings of HDMS 2006. Abstract (in Greek).

Technical Reports

E. Pitoura, K. Stefanidis and A. B. Zaslavsky. Context in Databases. Technical Report TR 2004-19, Department of Computer Science, University of Ioannina, Greece. [Local copy]

Other Publications

S. B. Roy, K. Stefanidis, G. Koutrika, L. Lakshmanan, M. Riedewald. Report on the Third International Workshop on Exploratory Search in Databases and the Web (ExploreDB 2016). SIGMOD Record, vol. 45, no. 3, p. 35-38, September 2016.

K. Stefanidis, G. Flouris, I. Chrysakis and Y. Roussakis. D2V - Understanding the Dynamics of Evolving Data: A Case Study in the Life Sciences. ERCIM News, vol. 2016, no. 105, 2016.

G. Koutrika, L. Lakshmanan, M. Riedewald, M. Sharaf and K. Stefanidis. Report on the Second International Workshop on Exploratory Search in Databases and the Web (ExploreDB 2015). SIGMOD Record, vol. 44, no. 4, p. 49-52, December 2015.

V. Christophides, K. Stefanidis and V. Efthymiou. WebER: Resolving Entities in the Web. European Data Forum, November 2015.

G. Koutrika, L. Lakshmanan, M. Riedewald and K. Stefanidis. Report on the First International Workshop on Exploratory Search in Databases and the Web (ExploreDB 2014). SIGMOD Record, vol. 43, no. 2, p. 49-52, June 2014.

K. Stefanidis and K. Norvag. gRecs: Exploiting the Power of Data Mining Techniques for Efficient Computation of Group Recommendations. ERCIM News, vol. 2013, no. 92, 2013.

Theses

K. Stefanidis. Personalized Data Management: Models, Algorithms and Systems. PhD Thesis, Department of Computer Science, University of Ioannina, Greece, 2009.

K. Stefanidis. Context-Aware Preferences for Database Systems. MSc Thesis, Department of Computer Science, University of Ioannina, Greece, 2005.

K. Stefanidis. Publish/Subscribe Systems in Relational Databases. BSc Thesis, Department of Computer Science, University of Ioannina, Greece, 2003.


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