Publications

Forecasting Resource Demand for Dynamic Datacenter Sizing in Telco Infrastructures. Dimitra Paranou, Angelos Pentelas, Dimitris Katsiros, Konstantinos Maidatsis, George Giannopoulos, Evangelos Angelou, Nikos Anastopoulos, George Papastefanatos. 2023 IEEE International Conference on Big Data (BigData), 2023 

A Tool for Visual Exploration and Analysis of Solar Photovoltaic Module Data. Vassilis Stamatopoulos, Stavros Maroulis, Konstantinos Kozanis, Ioannis Psarros, George Papastefanatos, Giorgos Giannopoulos, Manolis Terrovitis. EDBT/ICDT Workshops 2023, 2023 

Auditing for Spatial Fairness. Dimitris Sacharidis, Giorgos Giannopoulos, George Papastefanatos, Kostas Stefanidis. EDBT 2023, 2023 

Machine Learning Platform for Extreme Scale Computing on Compressed IoT Data. Seshu Tirupathi et al. IEEE International Conference on Big Data (Big Data 22), 2022 

VisualFacts: A Platform for In-Situ Visual Exploration and Real-Time Entity Resolution. George Papastefanatos, Giorgos Alexiou, Nikos Bikakis, Stavros Maroulis, Vassilis Stamatopoulos. EDBT'22 Workshops , 2022 

RawVis: A System for Efficient In-situ Visual Analytics. Stavros Maroulis, Nikos Bikakis, George Papastefanatos, Panos Vassiliadis, Yannis Vassiliou. In SIGMOD 2021, Xi'an, Shaanxi, China, June 20 - 25, 2021 (Demo Paper), 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 

Assessing Staff's and Stroke Patients' Experiences in 8 Hospitals in Greece: Results from a Prospective Multi-Center Study. Petros Galanis et. al. 20th International Conference on Informatics, Management, and Technology in Healthcare (ICIMTH 2021): 392-396 , 2021 

Interactivity, Fairness and Explanations in Recommendations. Giorgos Giannopoulos, George Papastefanatos, Dimitris Sacharidis, Kostas Stefanidis. In 6th International Workshop on Human Aspects in Adaptive and Personalized Interactive Environments (HAAPIE'21) in conjunction with ACM UMAP 2021, June 21-25, 2021, Utrecht, The Netherlands, 2021 

Evo-Path: Querying Data Evolution Through Complex Changes. Theodora Galani, Yannis Stavrakas, George Papastefanatos, and Yannis Vassiliou. 10th International Conference on Data Science, Technology and Applications (DATA 21): 353-361, July 6-8, 2021, 2021

Patients' Experiences Database After Hospital Discharge: Another Step in Improving Stroke Care. O.Konstantakopoulou et.al. In International Conference on Informatics, Management and Technology in Healthcare (ICIMTH 2020): 2020, 272:441-444,, 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 

Open Science Observatory: Monitoring Open Science in Europe. George Papastefanatos, Elli Papadopoulou, Marios Meimaris, Antonis Lempesis, Stefania Martziou, Paolo Manghi, Natalia Manola. In ADBIS/TPDL/EDA Workshops 2020: 341-346, 2020 

Sun4Patients Web Platform: Facilitating Long-Term Monitoring of Stroke Patients. George Papastefanatos, Stefanos Papastefanatos, Eleni Korompoki, Petros Galanis, Olympia Konstantakopoulou, Iliana Karagkouni, Parisis Gallos, George Ntaios, Kostas Vemmos, Olga Siskou. International Conference on Informatics, Management and Technology in Healthcare (ICIMTH 2020): 2020, 272:411-412, 2020 

Big Data Visualization and Analytics: Future Research Challenges and Emerging Applications. G. L. Andrienko, N.V. Andrienko, S. Mark Drucker, J-D Fekete, D. Fisher, S. Idreos, T. Kraska, G. Li, K-L Ma, J.D. Mackinlay, A. Oulasvirta, T. Schreck, H. Schumann, M. Stonebraker, D. Auber, N. Bikakis, P. K. Chrysanthis, G. Papastefanatos, M.A. Sha. In 3rd International Workshop on Big Data Visual Exploration and Analytics (BigVis2020) co-located with EDBT/ICDT 2020 Joint Conference Copenhagen, Denmark, March 30, 2020, 2020 

A Comparative Study of State-of-The-Art Linked Data Visualization Tools. Federico Desimoni, Nikos Bikakis, Laura Po, George Papastefanatos. In VOILA Workshop, jointly with ISWC 2020, 2020 

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 

RawVis: Visual Exploration over Raw Data. Nikos Bikakis, Stavros Maroulis, George Papastefanatos, Panos Vassiliadis. 17th Hellenic Data Management Symposium (HDMS’19), 2019

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 

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 

Extraction of Embedded Queries via Static Analysis of Host Code. P. Manousis, A. Zarras, P. Vassiliadis, G. Papastefanatos. In 29th International Conference on Advanced Information Systems Engineering (CAiSE'17), 12-16 June 2017, Essen, Germany, 2017 

Introducing Solon: A Semantic Platform for Managing Legal Sources. Marios Koniaris, George Papastefanatos, Marios Meimaris, Giorgos Alexiou. International Conference on Theory and Practice of Digital Libraries (TPDL 2017) (pp. 603-607). Springer, Cham., 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 

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 

Towards Automatic Structuring and Semantic Indexing of Legal Documents. M. Koniaris, G. Papastefanatos, Y. Vassiliou. In 20th Panhellenic Conference on Informatics (PCI’16), Patras Greece, 10 – 12 November 2016, 2016 

graphVizdb: A Scalable Platform for Interactive Large Graph Visualization. N. Bikakis, J. Liagouris, M. Krommyda, G. Papastefanatos, T.Sellis. In 32nd IEEE International Conference on Data Engineering(ICDE 2016) - Demo, Helsinki, Finland, May 2016, 2016 

OpenAIRE LOD services: Scholarly Communication Data as Linked Data. Giorgos Alexiou, Sahar Vahdati, Christoph Lange, George Papastefanatos, Steffen Lohmann. Semantics, Analytics, Visualisation: Enhancing Scholarly Data Workshop (SAVE-SD 2016) co-located with the 25th International World Wide Web Conference (WWW 2016) April 11, 2016 - Montreal, Canada, 2016 

“Just the facts” with PALOMAR: Detecting protest events in media outlets and Twitter. Konstantina Papanikolaou, Haris Papageorgiou, Nikos Papasarantopoulos, Theoni Stathopoulou, George Papastefanatos. First “Social Media in the Newsroom” workshop (SMnews2016), co-located with the International Conference on Web and Social Media (ICWSM 2016), Cologne, Germany, 17th May, 2016., 2016 

The EvoGen Benchmark Suite for Evolving RDF Data. Marios Meimaris, George Papastefanatos. 2nd Workshop on Managing the Evolution and Preservation of the Data Web (MEPDaW 2016) co-located with 13th European Semantic Web Conference (ESWC 2016), Heraklion, Crete, Greece, May 30th, 2016, 2016 

Enabling persistent identification of groups of duplicates in data aggregators. Giorgos Alexiou, Marios Meimaris, George Papastefanatos. 7th International Workshop on Data Engineering meets the Semantic Web (hosted by 32nd International Conference on Data Engineering), May 16-20, 2016, Helsinki, Finland , 2016 

Scaling Entity Resolution to Large, Heterogeneous Data with Enhanced Meta-blocking. George Papadakis, George Papastefanatos, Themis Palpanas, Manolis Koubarakis. 19th International Conference on Extending Database Technology, EDBT 2016, Bordeaux, France, March 15-16, 2016 

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 

Efficient Computation of Containment and Complementarity in RDF Data Cubes. Marios Meimaris, George Papastefanatos, Panos Vassiliadis, Ioannis Anagnostopoulos. 19th International Conference on Extending Database Technology, EDBT 2016, Bordeaux, France, March 15-16, 2016 

A Language for Defining and Detecting Interrelated Complex Changes on RDF(S) Knowledge Bases. Theodora Galani, George Papastefanatos, Yannis Stavrakas. In 18th International Conference on Enterprise Information Systems (ICEIS 2016), 25-28 April 2016, 2016

Parallel meta-blocking: Realizing scalable entity resolution over large, heterogeneous data. Vasilis Efthymiou, George Papadakis, George Papastefanatos, Kostas Stefanidis, Themis Palpanas. IEEE International Conference on Big Data (IEEE BigData 2015), Oct 29 - Nov 01, 2015 @ Santa Clara, CA, USA, 2015 

RDF Keyword Search based on Keywords-To-SPARQL Translation. Katerina Gkirtzou, George Papastefanatos, Theodore Dalamagas. 1st International Workshop on Novel Web Search Interfaces and Systems, NWSearch 2015 (with CIKM15), Melbourne, Australia, October 23, 2015. , 2015 

An Archiving System for Managing Evolution in the Data Web. Marios Meimaris, George Papastefanatos, Christos Pateritsas. MEPDaW First Diachron Workshop (hosted by ESWC 2015), June 2015 , 2015 

Towards Scalable Visual Exploration of Very Large RDF Graphs. Nikos Bikakis, John Liagouris, Maria Kromida, George Papastefanatos, and Timos Sellis. 12th Extended Semantic Web Conference (ESWC 2015), 2015 

RDF Resource Search and Exploration with LinkZoo. Marios Meimaris, George Alexiou, Katerina Gkirtzou, George Papastefanatos, Theodore Dalamagas. In DATA 2015 pp. 232-239, 2015 

Supporting Complex Changes in RDF(S) Knowledge Bases. Theodora Galani, Yannis Stavrakas, George Papastefanatos, and Giorgos Flouris. MEPDaW First Diachron Workshop (hosted by ESWC 2015), June 2015, 2015 

Airport Context Analytics. Eli Katsiri, George Papastefanatos, Manolis Terrovitis, Timos Sellis. In 8th International Conference on Web Reasoning and Rule Systems, (RR2014), September 2014, Athens, Greece., 2014 

Towards a methodology for publishing Linked Open Statistical Data. Irene Petrou, Marios Meimaris, George Papastefanatos. Samos 2014 Summit on ICT-enabled Governance, June 30 – July 5, 2014, Samos, Greece. , 2014 

rdf:SynopsViz: A Framework for Hierarchical Linked Data Visual Exploration and Analysis. Nikos Bikakis, Melina Skourla, George Papastefanatos. 11th Extended Semantic Web Conference (ESWC2014) – Demo Track, Anissaras, Crete, Greece, May 2014, 2014 

LinkZoo: A linked data platform for collaborative management of heterogeneous resources. Marios Meimaris, George Alexiou, George Papastefanatos. 11th Extended Semantic Web Conference (ESWC2014) – Demo Track, Anissaras, Crete, Greece, May 2014, 2014 

Αυτοματοποίηση της Προσαρμογής Εξελισσόμενων Οικοσυστημάτων Δεδομένων. P. Manousis, P.Vassiliadis, G. Papastefanatos. 12ο Ελληνικό Συμπόσιο Διαχείρισης Δεδομένων (ΕΣΔΔ’14), Αθήνα, Ιούλιος 2014., 2014

Towards a Framework for Managing Evolving Information Resources on the Data Web. Marios Meimaris, George Papastefanatos, Christos Pateritsas, Theodora Galani, Yannis Stavrakas. 1st International Workshop on Dataset PROFIling & fEderated Search for Linked Data (PROFILES) 2014, collocated with ESWC 2014, electronic proceedings in CEUR-WS vol. 1151, 2014 

Containment and Complementarity Relationships in Multidimensional Linked Open Data. Marios Meimaris, George Papastefanatos. In Semantic Statistics (SEMSTATS) 2014, collocated with ISWC 2014, electronic proceedings in CEUR-WS.org, 2014 

Automating the Adaptation of Evolving Data-Intensive Ecosystems. Petros Manousis, Panos Vassiliadis, George Papastefanatos. 32nd International ER International Conference on Conceptual Modeling (ER 2013), Hong Kong, 11-13, November, 2013. , 2013

Challenges and Opportunities in the Evolving Data web. George Papastefanatos. 1st International Workshop on Modeling and Management of Big Data (MoBiD ), November 13, 2013, Hong Kong, 2013

Publishing Census as Linked Open Data. A Case Study. Irene Petrou , George Papastefanatos, Theodore Dalamagas . 2nd International Workshop on Open Data (WOD13), 2013

Capturing the History and Change Structure of Evolving Data. George Papastefanatos, Yannis Stavrakas, and Theodora Galani. Fifth International Conference on Advances in Databases, Knowledge, and Data Applications (DBKDA 2013), Seville, Spain, January 2013, 2013 

Διάδοση Αλλαγών Σε Πληροφοριακά Οικοσυστήματα. George Papastefanatos, Panos Vassiliadis, Alkis Simitsis. Ελληνικό Συμπόσιο Βάσεων Δεδομένων (HDMS’12), 2012

Diachronic Linked Data: Towards Long-Term Preservation of Structured Interrelated Information. Yannis Stavrakas, George Papastefanatos, Theodore Dalamagas and Vassilis Christophides. International Workshop on Open Data (WOD 2012), Nantes, France, May 25 2012, 2012

Publishing Life Science Data as Linked Open Data: the Case Study of miRBase. Theodore Dalamagas, Nikos Bikakis, George Papastefanatos, Yannis Stavrakas and Artemis Hatzigeorgiou. International Workshop on Open Data (WOD 2012), Nantes, France, May 25 2012, 2012

Propagating Evolution Events in Data-Centric Software Artifacts. George Papastefanatos, Panos Vassiliadis, Alkis Simitsis. In 3rd International Workshop on Hot Topics in Software Upgrades (HotSWUp'11 - in conjunction with ICDE 2011), 2011

Using Structured Changes for Elucidating Data Evolution. Yannis Stavrakas, George Papastefanatos. ICDE Workshop on Managing Data Throughout its Lifecycle (DaLi 2011), Hannover, Germany, 2011 

Hecataeus: Regulating Schema Evolution. George Papastefanatos, Panos Vassiliadis, Alkis Simitsis, Yannis Vassiliou. 26th International Conference on Data Engineering (ICDE'10), 2010 

Supporting Complex Changes in Evolving Interrelated Web Databanks. Yannis Stavrakas, George Papastefanatos. 18th International Conference on Cooperative Information Systems (CoopIS 2010), Crete, Greece, October 27-29, 2010 

Collaborative information spaces: Research directions at IMIS. George Papastefanatos, Yannis Stavrakas, Christos Papatheodorou, Theodore Dalamagas, Dieter Pfoser, Timos Sellis. 2nd ERCIM DIS Workshop on large scale and federated information spaces, Amsterdam, 2010 

Rule-based Management of Schema Changes at ETL sources. George Papastefanatos, Panos Vassiliadis, Alkis Simitsis, Timos Sellis, Yannis Vassiliou. Workshop on Managing Evolution of Data Warehouses (MEDWa ’09), 2009

Data-Driven Soiling Detection in PV Modules. Alexandros Kalimeris, Ioannis Psarros, Giorgos Giannopoulos, Manolis Terrovitis, George Papastefanatos, Gregory Kotsis. IEEE Journal of Photovoltaics (Volume: 13, Issue: 3, May 2023) , 2023 

Resource-aware adaptive indexing for in situ visual exploration and analytics. Stavros Maroulis, Nikos Bikakis, George Papastefanatos, Panos Vassiliadis, Yannis Vassiliou. VLDB J. (32), pages 199–227 (2023), 2023 

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

In-Situ Visual Exploration over Big Raw Data. Nikos Bikakis, Stavros Maroulis, George Papastefanatos, Panos Vassiliadis. In Inf. Syst. 95: 101616 , 2021 

Defining and Detecting Complex Changes on RDF(S) Knowledge Bases. Theodora Galani, George Papastefanatos, Yannis Stavrakas, and Yannis Vassiliou. Journal on Data Semantics, 10(3-4): 367-398, 2021, 2021

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 

Big Data Exploration, Visualization and Analytics. Nikos Bikakis, George Papastefanatos, Olga Papaemmanouil. Journal on Big Data Research, Vol. 18 (2019). Editorial in Special Issue, 2019 

Solon: A Holistic Approach for Modelling, Managing and Mining Legal Sources. Marios Koniaris, George Papastefanatos, Ioannis Anagnostopoulos. Algorithms Journal, 11 (12), 196, 2018 

Computational Methods and Optimizations for Containment and Complementarity in Web Data Cubes. M. Meimaris, G. Papastefanatos, P. Vassiliadis, I. Anagnostopoulos. Information Systems 75: 56-74 (2018)., 2018 

Parallel Meta-blocking for Scaling Entity Resolution over Big Heterogeneous Data. V. Efthymiou, G. Papadakis, G. Papastefanatos, K. Stefanidis, T. Palpanas. Information Systems 65: 137-157 (2017), 2017 

Boosting the efficiency of large-scale entity resolution with enhanced meta-blocking. G. Papadakis, G. Papastefanatos, T. Palpanas, M. Koubarakis.. Journal of Big Data research (6): 43-63 (2016), DOI: 10.1016/j.bdr.2016.08.002, 2016 

A Query Language for Multi Version Data Web Archives. Marios Meimaris, George Papastefanatos, Stratis Viglas, Yannis Stavrakas, Christos Pateritsas, Ioannis Anagnostopoulos. Expert Systems 33(4): 383-404 (2016), 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 

Impact Analysis and Policy-Conforming Rewriting of Evolving Data-Intensive Ecosystems. Petros Manousis, Panos Vassiliadis, George Papastefanatos. Journal on Data Semantics 4(4): 231-267 (2015), 2015 

Schema-agnostic vs Schema-based Configurations for Blocking Methods on Homogeneous Data. George Papadakis, George Alexiou, George Papastefanatos, Georgia Koutrika. PVLDB 9(4): 312-323 (2015), 2015 

Towards a methodology for publishing Linked Open Statistical Data. Irene Petrou, Marios Meimaris, George Papastefanatos. eJournal of eDemocracy and Open Government (JeDEM), Vol 6, No 1 (2014), 2014 

Supervised Metablocking. George Papadakis, George Papastefanatos, Georgia Koutrika. PVLDB 7(14): 1929-1940 (2014), 2014 

Publishing Greek Census Data as Linked Open Data. Irene Petrou, George Papastefanatos . ERCIM News 2014(96), 2014 

Diachronic Linked Data: Capturing the Evolution of Structured Interrelated Information on the Web. George Papastefanatos, and Yannis Stavrakas. ERCIM News on Open Linked Data, Number 96, page 36, January 2014, 2014

Metrics for the Prediction of Evolution Impact in ETL Ecosystems: A Case Study. George Papastefanatos, Panos Vassiliadis, Alkis Simitsis, Yannis Vassiliou. Journal on Data Semantics 1(2): 75-97 (2012), 2012

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 

A Query Language for Multi-version Data Web Archives. Marios Meimaris, George Papastefanatos, Stratis Viglas, Yannis Stavrakas and Christos Pateritsas. TR-IMIS-2015-2, 2015 

Boosting the Efficiency of Large-scale Entity Resolution with Enhanced Meta-blocking. George Papadakis, George Papastefanatos, Themis Palpanas. TR-IMIS-2015-1, 2015 

Adaptive indexing for interactive visual exploration and analytics. Stavros Maroulis. NTUA (supervisor: Prof. Yannis Vassiliou), July 2023, 2023 

Managing Evolution in Web Data through Complex Changes. Theodora Galani. NTUA (supervisor: Prof. Yannis Vassiliou), November 2021, 2021

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

Linked Data Visualization Book Techniques, Tools and Big Data . Laura Po, Nikos Bikakis, Federico Desimoni and George Papastefanatos. Series in Synthesis Lectures on the Semantic Web, In Morgan & Claypool Publishers, 2020. (ISBN: 9781681737256 (softcover) | 9781681737263 (ebook) ISBN: 9781681737270 (hardcover), 2020 

Cyber security and its impact on Connected Autonomous Vehicles safety: State-of-the-art, policy needs and challenges. Christos Katrakazas, Athanasios Theofilatos, George Papastefanatos, Jerome Härri, Costas Antoniou. Book Chapter in Volume “Policy Implications of Autonomous Vehicles”, Elsevier, Advances in Transport Policy and Planning, Volume 5, Pages 73-94, 2020 

Socioscope - A visual analytics platform for open socioeconomic data. George Papastefanatos, Stavros Maroulis. Chapter in Book “Transformations of Protest in Greece”, Stathopoulou, T (ed.), Papazisis publishers & NCSR 2019, 2019 

Schema Evolution for Databases and Data Warehouses. Petros Manousis, Panos Vassiliadis, Apostolos Zarras, George Papastefanatos. Lecture Notes in Business Information Processing (253), Springer 2016, ISBN 978-3-319-39242-4, 2016