Dimitris Bilidas@UoA

Dimitris Bilidas


Hi! My name is Δημήτρης (formally:Δημήτριος) Μπηλίδας. According to ISO 843 TR, the romanized version of my name is Dimitris (formally: Dimitrios) Bilidas. Here you can mostly find information about my academic and research activities.


I am a postdoctoral researcher at the AI group and MADgIK lab at the Department of Informatics and Telecommunications of National and Kapodistrian University of Athens, working with Prof. Manolis Koubarakis.

My research is in the area of Artificial Intelligence (Knowledge Representation and Reasoning) and Databases, focusing on efficient techniques for Semantic Web data processing. I am keen on combining theoretical results with practical systems and applying them in real world use cases. I have extensive research experience in several national and european research projects. I am also a member of the Hellenic Association of Artificial Intelligence.


Work and Research Experience

In 2006, while doing my undergraduate thesis in the SKEL lab of NSCR Demokritos, I started working on the national research project Xenios, work that continued in the three-year FP6 research project INDIGO, under the supervision of Vangelis Karkaletsis. My work was relevant to developing the ELEON authoring tool, a tool for allowing the user to develop OWL ontologies and enrich them with lingustic data and target user preference values, in order to be provided as input to a personalized natural language generation engine. As a continuation of this work, for the internal RoboSKEL project, I also developed a dialogue system that was utilizing the previously mentioned components.

For 9 months, starting from September 2011, I was working on cyber security and cyber defence issues in the Hellenic National Defence General Staff, as part of my obligatory military service.

In 2012 I started working in National and Kapodistrian University of Athens under the supervision of Prof. Koubarakis in the 4-year FP7 project Optique, developing techniques for Ontology-Based data access (OBDA) distributed query execution over federated data sources, succesfully deployed in the Statoil Optique use-case. More recently, I started working on parallel and distributed execution of geospatial RDF queries for the Copernicus App Lab and ExtremeEarth european projects.


[1] Dimitris Bilidas and Manolis Koubarakis. Handling redundant processing in OBDA query execution over relational sources. Journal of Web Semantics, 100639, 2021.
[2] Dimitris Bilidas and Manolis Koubarakis. In-memory parallelization of join queries over large ontological hierarchies. Distributed and Parallel Databases, pages 1-38, 2020.
[3] Dimitris Bilidas and Manolis Koubarakis. Scalable parallelization of RDF joins on multicore architectures. In Advances in Database Technology - 22nd International Conference on Extending Database Technology, EDBT 2019, Lisbon, Portugal, March 26-29, 2019, pages 349-360, 2019.
[4] Manolis Koubarakis, Konstantina Bereta, Dimitris Bilidas, Konstantinos Giannousis, Theofilos Ioannidis, Despina-Athanasia Pantazi, George Stamoulis, Seif Haridi, Vladimir Vlassov, Lorenzo Bruzzone, Claudia Paris, Torbjorn Eltoft, Thomas Kramer, Angelos Charalambidis, Vangelis Karkaletsis, Stasinos Konstantopoulos, Theofilos Kakantousis, Mihai Datcu, Corneliu Octavian Dumitru, Florian Appel, Heike Bach, Silke Migdall, Nick Hughes, David Arthurs and Andrew Fleming From copernicus big data to extreme earth analytics. Advances in Database Technology - 22nd International Conference on Extending Database Technology, EDBT 2019, Lisbon, Portugal, March 26-29, 2019, pages 690-693, 2019.
[5] D Punjani, K Singh, A Both, M Koubarakis, I Angelidis, K Bereta, T Beris, D Bilidas, T Ioannidis, N Karalis, C Lange, D Pantazi, C Papaloukas and G Stamoulis . Template-based question answering over linked geospatial data. In Proceedings of the 12th Workshop on Geographic Information Retrieval, page 7. ACM, 2018.
[6] Guohui Xiao, Dag Hovland, Dimitris Bilidas, Martin Rezk, Martin Giese, and Diego Calvanese. Efficient ontology-based data integration with canonical IRIs. In European Semantic Web Conference, pages 697-713. Springer, 2018.
[7] Dimitris Bilidas and Manolis Koubarakis. Efficient duplicate elimination in SPARQL to SQL translation. In 31st International Workshop on Description Logics, volume 2211, 2018.
[8] Evgeny Kharlamov, Dag Hovland, Martin G Skjæveland, Dimitris Bilidas, Ernesto Jimenez-Ruiz, Guohui Xiao, Ahmet Soylu, Davide Lanti, Martin Rezk, Dmitriy Zheleznyakov, Martin Giese, Hallstein Lie, Yannis Ioannidis, Yannis Kotidis, Manolis Koubarakis and Arild Waaler. Ontology based data access in Statoil. Journal of Web Semantics, 44:3-36, 2017.
[9] Evgeny Kharlamov, Theofilos Mailis, Konstantina Bereta, Dimitris Bilidas, Sebastian Brandt, Ernesto Jiménez-Ruiz, Steffen Lamparter, Christian Neuenstadt, Özgür Özçep, Ahmet Soylu, Christoforos Svingos, Guohui Xiao, Dmitriy Zheleznyakov, Diego Calvanese, Ian Horrocks, Martin Giese, Yannis Ioannidis, Yannis Kotidis, Ralph Möller and Arild Waaler. A semantic approach to polystores. In 2016 IEEE International Conference on Big Data (Big Data), pages 2565-2573. IEEE, 2016.
[10] Evgeny Kharlamov, Ernesto Jiménez-Ruiz, Dmitriy Zheleznyakov, Dimitris Bilidas, Martin Giese, Peter Haase, Ian Horrocks, Herald Kllapi, Manolis Koubarakis, Özgür Özçep, Mariano Rodriguez-Muro, Riccardo Rosati, Michael Schmidt, Rudolf Schlatte, Ahmet Soylu and Arild Waaler Optique: Towards OBDA systems for industry. In Extended Semantic Web Conference, pages 125-140. Springer, 2013.
[11] Herald Kllapi, Dimitris Bilidas, Ian Horrocks, Yannis E Ioannidis, Ernesto Jimenez-Ruiz, Evgeny Kharlamov, Manolis Koubarakis, and Dmitriy Zheleznyakov. Distributed query processing on the cloud: the Optique point of view (short paper). In OWLED. Citeseer, 2013.
[12] Stasinos Konstantopoulos, Vangelis Karkaletsis, Dimitrios Vogiatzis, and Dimitris Bilidas. Authoring semantic and linguistic knowledge for the dynamic generation of personalized descriptions. In Language Technology for Cultural Heritage, pages 115-132. Springer, 2011.
[13] Vangelis Karkaletsis, Stasinos Konstantopoulos, Dimitris Bilidas, Athanasios Tegos, Ion Androutsopoulos, Gerasimos Lampouras, Prodromos Malakasiotis, Panos Trahanias, and Haris Baltzakis. Natural interaction with personality and dialogue enabled robots. In Proc. Hellenic Artificial Intelligence Conference (SETN). Lecture Notes in Artificial Intelligence, volume 6040, 2010.
[14] Vangelis Karkaletsis, Stasinos Konstantopoulos, Dimitris Bilidas, and Dimitrios Vogiatzis. INDIGO project: personality and dialogue enabled cognitive robots. In Proceedings of the 3rd International Conference on PErvasive Technologies Related to Assistive Environments, page 69. ACM, 2010.
[15] Stasinos Konstantopoulos, Vangelis Karkaletsis, and Dimitris Bilidas. An intelligent authoring environment for abstract semantic representations of cultural object descriptions. In Proceedings of the EACL 2009 Workshop on Language Technology and Resources for Cultural Heritage, Social Sciences, Humanities, and Education, pages 10-17. Association for Computational Linguistics, 2009.
[16] Stasinos Konstantopoulos, Athanasios Tegos, Dimitris Bilidas, Ion Androutsopoulos, Gerasimos Lampouras, Prodromos Malakasiotis, Colin Matheson, and Olivier Deroo. Adaptive natural language interaction. In Proceedings of the 12th Conference of the European Chapter of the Association for Computational Linguistics: Demonstrations Session, pages 37-40. Association for Computational Linguistics, 2009.
[17] Dimitris Bilidas, Maria Theologou, and Vangelis Karkaletsis. Enriching OWL ontologies with linguistic and user-related annotations: the ELEON system. In Tools with Artificial Intelligence, 2007. ICTAI 2007. 19th IEEE International Conference on, volume 2, pages 464-467. IEEE, 2007.

Contact Info

National and Kapodistrian University of Athens
Dept. of Informatics and Telecommunications
Office I1, Panepistimioupolis, Ilissia
GR-15784 Athens, Greece
Tel: +30.210.727.5159
Fax: +30.210.727.5214
e-mail: d.bilidas at di's domain (di's domain is di.uoa.gr)

16 APRIL 2021