Publications

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 

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 

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 

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 

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 

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 

EvoGen: a Generator for Synthetic Versioned RDF. Marios Meimaris . In DIACHRON 2016 (collocated with EDBT 2016), 2016 

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 

TripleGeo-CSW: A Middleware for Exposing Geospatial Catalogue Services on the Semantic Web. Spiros Athanasiou, Nikos Georgomanolis, Kostas Patroumpas, Michail Alexakis, and Thodoris Stratiotis. 5th International Workshop on Linked Web Data Management (LWDM), Brussels, 2015, 2015 

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 

Supporting SPARQL Update Queries in RDF-XML Integration. Bikakis Nikos, Tsinaraki Chrisa, Stavrakantonakis Ioannis, Christodoulakis Stavros. 13th International Semantic Web Conference (ISWC '14), 2014 

Greek Geospatial Linked Data: geodata.gov.gr/sparql. Kostas Patroumpas, Nikos Georgomanolis, Thodoris Stratiotis, Michail Alexakis, Spiros Athanasiou. 8th Greek HellasGIs Conference, Athens, Greece, December, 2014, 2014 

The GeoKnow Generator: Managing Geospatial Data in the Linked Data Web. Jon Jay Le Grange, Jens Lehmann, Spiros Athanasiou, Alejandra Garcia Rojas, Giorgos Giannopoulos, Daniel Hladky, Robert Isele, Axel-Cyrille Ngonga Ngomo, Mohamed Sherif, Claus Stadler. Linking Geospatial Data Workshop, 2014, 2014 

FAGI-tr: A tool for aligning geospatial RDF vocabularies. Giorgos Giannopoulos, Thomas Maroulis, Dimitrios Skoutas, Nikos Karagiannakis, Spiros Athanasiou. The 11th Extended Semantic Web Conference, Demo Track, 2014 (ESWC 2014), 2014 

TripleGeo: an ETL Tool for Transforming Geospatial Data into RDF Triples. Kostas Patroumpas, Michalis Alexakis, Giorgos Giannopoulos, Spiros Athanasiou. EDBT/ICDT Workshops 2014: 275-278, 2014 

FAGI: A framework for fusing geospatial RDF data. Giorgos Giannopoulos, Dimitrios Skoutas, Thomas Maroulis, Nikos Karagiannakis, Spiros Athanasiou. The 13th International Conference on Ontologies, DataBases, and Applications of Semantics, 2014 (ODBASE 2014), 2014 

Towards GeoSpatial Semantic Data Management: Strengths, Weaknesses, and Challenges Ahead. Kostas Patroumpas, Giorgos Giannopoulos, Spiros Athanasiou. ACM SIGSPATIAL 2014, 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 

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

RDivF: Diversifying Keyword Search on RDF Graphs. • Nikos Bikakis, Giorgos Giannopoulos, John Liagouris, Dimitrios Skoutas, Theodore Dalamagas, and Timos Sellis. 17th International Conference on Theory and Practice of Digital Libraries (TPDL '13), 2013 

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

Exploiting the Social and Semantic Web for guided Web Archiving. Thomas Risse, Stefan Dietze, Wim Peters, Katerina Doka, Yannis Stavrakas and Pierre Senellart. International Conference on Theory and Practice of Digital Libraries (TPDL 2012), Paphos, Cyprus, September 2012, 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 

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 

An Open-Source Natural Language Generator for OWL Ontologies and its Use in Protege and Second Life. D. Galanis, G. Karakatsiotis, G. Lampouras and I. Androutsopoulos. System demonstration, 12th Conference of the European Chapter of the Association for Computational Linguistics (EACL 2009), Athens, Greece, 2009., 2009 

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 

NaturalOWL: Generating Texts from OWL Ontologies in Protege and in Second Life. G. Karakatsiotis, D. Galanis, G. Lampouras and I. Androutsopoulos. System demonstration, 18th European Conference on Artificial Intelligence (ECAI 2008), Patras, Greece, 2008., 2008 

Building an Adaptive Museum Gallery in Second Life. J. Oberlander, G. Karakatsiotis, A. Isard and I. Androutsopoulos. Proceedings of Museums and the Web, Montreal, Quebec, Canada, 2008., 2008 

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 

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 

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 

Exposing INSPIRE on the Semantic Web. Kostas Patroumpas, Nikos Georgomanolis, Thodoris Stratiotis, Michail Alexakis, Spiros Athanasiou,. Journal of Web Semantics, Special Issue on Geospatial Semantics, 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 

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

GeoKnow: Making the Web an Exploratory Place for Geospatial Knowledge. Spiros Athanasiou, Daniel Hladky, Giorgos Giannopoulos, Alejandra Garcia Rojas and Jens Lehmann. Ercim news 2014, 2014(96), 2014 

GeoKnow: Geo-Anwendungen im Daten-Web. Jens Lehmann, Konrad Höffner, Sandra Prätor, Stephanie Lehmann, Axel Ngonga, Alejandra Garcia-Rojas, Spiros Athanasiou. gis.Business (2013), 2013 

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

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

Personalized, Semantic and Exploratory Data Analysis / Εξατομικευμένη, Σημασιολογική και Διερευνητική Ανάλυση Δεδομένων. Nikos Bikakis . National Technical University of Athens, Greece, 2016 

Methods on retrieving sources and data from the Web, for supporting scientific innovation. Giorgos Giannopoulos. National Technical University of Athens, Greece, 2013 

Discovery and Integration of Data and Services in the Semantic Web. Dimitrios Skoutas. PhD Thesis, School of Electrical and Computer Engineering, National Technical University of Athens, 2008

Transformation of cultural heritage XML metadata in CIDOC CRM ontology. Orestis Polychronakis. School of Electrical and Computer Engineering, NTUA, 2010 

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 

Managing Geospatial Linked Data in the GeoKnow Project. Jens Lehmann, Spiros Athanasiou, Andreas Both, Alejandra Garcia Rojas, Giorgos Giannopoulos, Daniel Hladky, Jon Jay Le Grange, Axel-Cyrille Ngonga-Ngomo, Mohamed Ahmed Sherif, Claus Stadler, Matthias Wauer, Patrick Westphal. The Semantic Web in Earth and Space Science. Current Status and Future Directions, Vol. 20 of Studies on the Semantic Web. IOS Press., 2015 

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