Publications

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Conferences/Workshops

2022

YeSQL: You extend SQL with Rich and Highly Performant User-Defined Functions in Relational Databases. Yannis Foufoulas, Alkis Simitsis, Lefteris Stamatogiannakis, Yannis Ioannidis. PVLDB, 2022
YeSQL: Rich User-Defined Functions without the Overhead. Yannis Foufoulas, Alkis Simitsis, Yannis Ioannidis. PVLDB, 2022
SheerMP: Optimized Streaming Analytics-as-a-Service over Multi-site and Multi-platform Settings. George Stamatakis, Antonis Kontaxakis, Alkis Simitsis, Nikos Giatrakos, Antonios Deligiannakis. EDBT, 2022 Full text
Database Optimizers in the Era of Learning. Dimitris Tsesmelis, Alkis Simitsis. IEEE ICDE, 2022 Full text

2021

Adaptive Indexing for In-situ Visual Exploration and Analytics. Stavros Maroulis, Nikos Bikakis, George Papastefanatos, Panos Vassiliadis, Yannis Vassiliou. In Proceedings of the 23rd International Workshop on Design, Optimization, Languages and Analytical Processing of Big Data co-located with EDBT/ICDT 2021 Joint Conference, DOLAP@EDBT/ICDT 2021, Nicosia, Cyprus, 2021 Full text
Extreme-Scale Interactive Cross-Platform Streaming Analytics - The INFORE Approach. Antonios Deligiannakis, Nikos Giatrakos, Yannis Kotidis, Vasilis Samoladas, Alkis Simitsis. SEA-Data@VLDB, 2021 Full text

2020

Hierarchical Property Set Merging for SPARQL Query Optimization . Marios Meimaris, George Papastefanatos, P. Vassiliadis. In Proceedings of the 22nd International Workshop on Design, Optimization, Languages and Analytical Processing of Big Data co-located with EDBT/ICDT 2020 Joint Conference, Copenhagen, Denmark, March 30, 2020 (Best Paper award), 2020 Full text
INforE: Interactive Cross-platform Analytics for Everyone. Nikos Giatrakos, David Arnu, Theodoros Bitsakis, Antonios Deligiannakis, Minos N. Garofalakis, Ralf Klinkenberg, Aris Konidaris, Antonis Kontaxakis, Yannis Kotidis, Vasilis Samoladas, Alkis Simitsis, George Stamatakis, Fabian Temme, et al.. ACM CIKM, 2020 Full text
Similarity search over enriched geospatial data. Kostas Patroumpas, Dimitrios Skoutas. Proceedings of the 6th International ACM SIGMOD Workshop on Managing and Mining Enriched Geo-Spatial Data (GeoRich 2020), 2020 Full text

2019

Merging RDF Characteristic Sets to Optimize SPARQL Queries. Marios Meimaris, George Papastefanatos. 17th Hellenic Data Management Symposium (HDMS’19), 2019
Merging RDF Characteristic Sets to Optimize SPARQL Queries (Extended Abstract). Marios Meimaris, George Papastefanatos. 13th International Workshop on Information Search, Integration, and Personalization, 9-10 May, 2019, Heraklion, 2019 Full text
Query driven Entity Resolution in Data Lakes. Giorgos Alexiou, G. Papastefanatos. 13th International Workshop on Information Search, Integration, and Personalization, 9-10 May, 2019, Heraklion, 2019 Full text

2018

RawVis: Visual Exploration over Raw Data. N. Bikakis, S. Maroulis, G. Papastefanatos, P. Vassiliadis. In 22nd European Conference on Advances in Databases and Information Systems (ADBIS 2018), September 2-5, Budapest, Hungary, 2018 Full text

2017

Extended Characteristic Sets: Graph Indexing for SPARQL Query Optimization. Marios Meimaris, George Papastefanatos, Nikos Mamoulis, Ioannis Anagnostopoulos. Data Engineering (ICDE), 2017 IEEE 33rd International Conference on, pp. 497-508. IEEE, 2017, 2017 Full text
Distance-Based Triple Reordering for SPARQL Query Optimization. Marios Meimaris, George Papastefanatos. Data Engineering (ICDE), 2017 IEEE 33rd International Conference on, pp. 1559-1562. IEEE, 2017, 2017 Full text

2016

Keyword-based retrieval of frequent location sets in geotagged photo trails. Paras Mehta, Dimitris Sacharidis, Dimitrios Skoutas, Agnès Voisard. 8th International Conference on Web Science (WebSci 2016), 2016 Full text
Similarity Search on Spatio-Textual Point Sets. Christodoulos Efstathiades, Alexandros Belesiotis, Dimitrios Skoutas, Dieter Pfoser. 19th International Conference on Extending Database Technology (EDBT 2016), 2016 Full text
Identifying and Describing Streets of Interest. Dimitrios Skoutas, Dimitris Sacharidis, Kostas Stamatoukos. 19th International Conference on Extending Database Technology (EDBT 2016), 2016 Full text
Exploration and Visualization in the Web of Big Linked Data: A Survey of the State of the Art. Nikos Bikakis and Timos Sellis. 6th International Workshop on Linked Web Data Management (LWDM), 2016 Full text
Double Chain-Star: an RDF indexing scheme for fast processing of SPARQL joins. Marios Meimaris, George Papastefanatos. 19th International Conference on Extending Database Technology, EDBT 2016, Bordeaux, France, March 15-16, 2016 Full text
Scalable Public Transportation Queries on the Database. Alexandros Efentakis. 19th International Conference on Extending DatabaseTechnology, (EDBT 2016), 2016 Full text

2015

COLD. Revisiting Hub Labels on the Database for Large-Scale Graphs. Alexandros Efentakis, Christodoulos Efstathiades, Dieter Pfoser. 14th International Symposium on Spatial and Temporal Databases (SSTD 2015), 2015 Full text

2014

Continuous monitoring of nearest trajectories. Dimitris Sacharidis, Dimitrios Skoutas, Georgios Skoumas. 22nd ACM International Conference on Advances in Geographic Information Systems (SIGSPATIAL 2014), 2014 Full text
A Study on External Memory Scan-based Skyline Algorithms. Nikos Bikakis, Dimitris Sacharidis, Timos Sellis. 25th International Conference on Database and Expert Systems Applications (DEXA '14), 2014 Full text
Regionally Influential Users in Location-Aware Social Networks. Panagiotis Bouros, Dimitris Sacharidis, Nikos Bikakis. 22nd ACM International Conference on Advances in Geographic Information Systems (ACM GIS SIGSPATIAL'14), 2014 Full text
Supporting SPARQL Update Queries in RDF-XML Integration. Bikakis Nikos, Tsinaraki Chrisa, Stavrakantonakis Ioannis, Christodoulakis Stavros. 13th International Semantic Web Conference (ISWC '14), 2014 Full text
Reconciling Multiple Categorical Preferences with Double Pareto-based Aggregation. Nikos Bikakis, Karim Benouaret, Dimitris Sacharidis. 19th International Conference on Database Systems for Advanced Applications (DASFAA '14), 2014 Full text

2012

SPARQL-RW: Transparent Query Access over Mapped RDF Data Sources. Makris Konstantinos, Bikakis Nikos, Gioldasis Nektarios, Christodoulakis Stavros. Proceedings of the 15th International Conference on Extending Database Technology (EDBT '12), 2012 Full text

2011

Optimizing Query Shortcuts in RDF Databases. Vicky Dritsou, Panos Constantopoulos, Antonios Deligiannakis, Yannis Kotidis. 8th Extended Semantic Web Conference (ESWC 2011), Creete, Greece, May 2011, 2011
Shortcut Selection in RDF Databases. Vicky Dritsou, Panos Constantopoulos, Antonios Deligiannakis, Yannis Kotidis. ICDE Workshop on Data Engineering meets the Semantic Web (DESWeb 2011), Hannover, Germany, April 2011, 2011
Efficient Answering of Set Containment Queries for Skewed Item Distributions. Manolis Terrovitis, Panagiotis Bouros, Panos Vassiliadis,Timos Sellis, Nikos Mamoulis. In Proceedings of the 14th International Conference on Extending Database Technology (EDBT '11), Uppsala, Sweden, 2011, 2011 Full text

2009

Adaptive Natural Language Interaction. S. Konstantopoulos, A. Tegos, D. Bilidas, I. Androutsopoulos, G. Lampouras, P. Malakasiotis, C. Matheson and O. Deroo. System demonstration, 12th Conference of the European Chapter of the Association for Computational Linguistics (EACL 2009), Athens, Greece, 2009., 2009 Full text

2008

INDIGO: Interaction with Personality and Dialogue Enabled Robots. S. Konstantopoulos, I. Androutsopoulos, H. Baltzakis, V. Karkaletsis, C. Matheson, A. Tegos and P. Trahanias. System demonstration, 18th European Conference on Artificial Intelligence (ECAI 2008), Patras, Greece, 2008, 2008 Full text
A Conversant Robotic Guide to Art Collections. D. Vogiatzis, D. Galanis, V. Karkaletsis, I. Androutsopoulos and C.D. Spyropoulos. Proceedings of the 2nd Workshop on Language Technology for Cultural Heritage Data, Language Resources and Evaluation Conference (LREC 2008), Marrakech, Morocco, 2008., 2008 Full text

Journals

2022

Relational schema optimization for RDF-based knowledge graphs. George Papastefanatos, Marios Meimaris, Panos Vassiliadis. Inf. Syst. 104: 101754, 2022 Full text

2020

LinkZoo: A Collaborative Resource Management Tool Based on Linked Data. Giorgos Alexiou, Marios Meimaris, George Papastefanatos, Ioannis Anagnostopoulos. International Journal on Semantic Web and Information Systems (IJSWIS) Volume 16, Issue 3, 1-19 (2020)., 2020 Full text

2016

A Hierarchical Aggregation Framework for Efficient Multilevel Visual Exploration and Analysis. Nikos Bikakis, George Papastefanatos, Melina Skourla, Timos Sellis. Semantic Web Journal (SWJ) vol. Preprint, no. Preprint, pp. 1-41, 2016, 2016 Full text

2015

Finding Desirable Objects under Group Categorical Preferences. Nikos Bikakis, Karim Benouaret, Dimitris Sacharidis. Knowledge and Information Systems Journal (KAIS), 2015 , 2015 Full text

2013

The SPARQL2XQuery Interoperability Framework. Bikakis Nikos, Tsinaraki Chrisa, Stavrakantonakis Ioannis, Gioldasis Nektarios, Christodoulakis Stavros. World Wide Web Journal (to appear), 2013 Full text

2011

Processing and evaluating partial tree pattern queries on xml data. Xiaoying Wu, Stefanos Souldatos, Dimitri Theodoratos, Theodore Dalamagas, Yannis Vassiliou, and Timos Sellis. IEEE Transactions on Knowledge and Data Engineering (TKDE), 2011 Full text

2009

Developing query patterns. Constantopoulos P., Dritsou V. & Foustoucos E. Research and Advanced Technology for Digital Libraries, Volume: 5714/2009, Pages: 119-124, 2009 Full text

Technical Reports

2022

QueryER: A Framework for Fast Analysis-Aware Deduplication over Dirty Data. Giorgos Alexiou, George Papastefanatos, Vassilis Stamatopoulos, Georgia Koutrika, Nectarios Koziris. TR.2022-1, 2022 Full text

2014

Efficient Identification of Implicit Facts in Incomplete OWL Knowledge Bases. John Liagouris and Manolis Terrovitis. Technical Report TR-IMIS-2014-1, 2014 Full text

2010

Efficient Answering of Set Containment Queries for Skewed Item Distributions. Manolis Terrovitis, Panagiotis Bouros, Panos Vassiliadis, Timos Sellis, Nikos Mamoulis. TR-IMIS-2010-1, 2010 Full text

PhD Theses

2018

Managing, Querying and Analyzing Big Data on the Web. Marios Meimaris. University of Thessaly (supervisor prof. I. Anagnostopoulos), 2018 Full text

2016

Diploma Theses

2011

Term suggestion techniques for Scientific Databases. Petsios Theofilos. School of Electrical and Computer Engineering, NTUA, 2011 Full text

2010

Approximate Sequence Matching with MapReduce. Δανάη Κούτρα. Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών, ΕΜΠ, 2010 Full text

Books

2013

The XML and Semantic Web Worlds: Technologies, Interoperability and Integration. A survey of the State of the Art. Bikakis Nikos, Tsinaraki Chrisa, Gioldasis Nektarios, Stavrakantonakis Ioannis, Christodoulakis Stavros. Semantic Hyper/Multi-media Adaptation: Schemes and Applications, Springer 2013, 2013 Full text