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about | r&d | publications | courses | people | links | ||
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Dr. Giorgos Stoilos | ||||||||
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Interests |
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My research interests include most aspects of knowledge representation and automated reasoning, especially focused on Description Logics (DLs) and ontology languages, such as OWL, as well as their application in areas like the Semantic Web and Multimedia. Recently I am working on the topic of scalable query answering over ontological knowledge where I have designed and developed novel hybrid methods for computing answers to user queries over large datasets. Most of these techniques have been implemented in the prototype tool Hydrowl and further details can be found there. Before I also worked in the problem of automatic evaluation and benchmarking of Description Logic and Semantic Web query answering systems, where I have designed and developed methods for the automatic generation of synthetic testing data and conjunctive queries. The algorithms been implemented in the prototype tool SyGENiA. Furthermore, I am also working on query rewriting over DL ontologies where I have designed and developed a new query rewriting system called IQAROS. While in Oxford, I participated in the development of the HermiT reasoner, where I developed HermiT's new optimised classification algorithm. Additionally, I am also currently working on semantic approximation techniques and scalable query answering over expressive ontologies. During my PhD I also worked on the problem of representing and reasoning with fuzzy knowledge, where I have developed fuzzy extensions of Description Logics and of OWL, as well as a number of tableaux reasoning algorithms for them that have been implemented in the FiRE fuzzy reasoner. Last but not least, I have also worked in the area of Ontology Alignment and semantic interoperability, where I have developed a new String Matching method, called I-Sub, which has been integrated in several popular Ontology Alignment and Schema Matching Systems, and recently in the NLP package of SWI-prolog. |
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Biography |
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I was born in Athens in July 1981. In 2003 I received my Degree in Computer Science from the Department of Computer Science and Telecommunication, National and Kapodistrian University of Athens. Then, at the same year I joined the Image, Video and Multimedia Laboratory (IVML), of the School of Electrical and Computer Engineering , National Technical University of Athens to study towards a PhD degree, which I successfully defended in February 2008. Then, I worked as a project manager and work package leader for 1 year in IVML which I left in May 2009 to join the Information Systems Group of the Department of Computer Science at the University of Oxford. I worked there for 2.5 years and in January 2012 I rejoined the group at IVML. Since April 2012 I hold a Marie Curie Career Reintegration Grant from European Union's Seventh Framework Programme (FP7/2007- 2013) [Marie Curie Actions]. |
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Distinctions - Academic Achievements |
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Research Projects |
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2012-2016 |
SCoRE (Marie Curie Grant FP7/2007- 2013) 303914) - Scalable and Complete Ontology Reasoning. |
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2009-2011 | HermiT reasoner (EPSRC Grand EP/F065841/1) - Hypertalbeaux Reasoning for Large Ontologies. | |||||||
2009-2011 | SEALS (RI238975-CPCSA) - Semantic Evaluation at Large Scale. | |||||||
2006-2009 | x-Media (IST-026978-IP) - Large Scale Knowledge Sharing and Reuse Across Media. | |||||||
2007-2009 | Boemie (IST-027538-STREP) - Bootstrapping Ontology Evolution with Multimedia Information Extraction | |||||||
2006-2008 | K-Space (IST-027026-NOE) - Knowledge Space of Semantic Inference for Automatic Annotation and Retrieval of Multimedia Content | |||||||
2004-2007 | Knowledge Web (IST-507482-NOE) - Realizing the Semantic Web, Semantic-Based Knowledge Systems. | |||||||
2004-2005 | aceMedia - Integrating Knowledge, Semantics and Content for User-Centred Intelligent Media Services | |||||||
2004-2005 | Cinegram - A System for characterization, management and access to Audio-Visual Databases | |||||||
2002-2003 | PoLoS - An Integrated Platform for Location Based Services | |||||||
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Software |
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Academic |
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Publications | ||||||||
See also a list of my publications (possibly) with citation analysis at DBLP, Google Scholar, Microsoft Academic Research, and Arnetminer |
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2015 | 2016 | |||||||
2014 | 2013 | |||||||
2012 | 2011 | |||||||
2010 | 2009 | |||||||
2008 | 2007 | |||||||
2006 | 2005 | |||||||
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Publications • 2016 | ||
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Efficient Query Answering Over Expressive Inconsistent Description Logics | [CONFERENCE] | |
Proceedings of the 25th International Joint Conference on Artificial Intelligence (IJCAI). | ||
[.pdf | .bib] | ||
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Query Rewriting Under Ontology Change | [JOURNAL] | |
The Computer Journal, In Press, 2016. | ||
[.pdf | .bib] | ||
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Publications • 2015 | ||
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Query Rewriting in Horn-SHIQ | [WORKSHOP] | |
Proceedings of the 28th International Workshop on Description Logics, Athens, 2015. | ||
[.pdf | .bib] | ||
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A Fuzzy Extension to the OWL 2 RL Ontology Language | [JOURNAL] | |
The Computer Journal, 58:2956-2971, 2015. | ||
[.pdf | .bib] | ||
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Optimising Resolution-Based Rewriting Algorithms for OWL Ontologies | [JOURNAL] | |
Journal of Web Semantics, 33:30-39, 2015. | ||
[.pdf | .bib] | ||
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Publications • 2014 | ||
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Reasoning Web. Reasoning on the Web in the Big Data Era - 10th International Summer School 2014 | [EDITED BOOK] | |
Lecture Notes in Computer Science 8714, Springer 2014, ISBN 978-3-319-10586-4. | ||
[DOI | .bib] | ||
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Hydrowl: A Hybrid Query Answering System for OWL 2 DL Ontologies | [CONFERENCE] | |
In Proceedings of the 8th International Conference on Web Reasoning and Rule Systems (RR 2014), Athens, Greece. | ||
[.pdf | .bib] | ||
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OBDA Using RL Reasoners and Repairing | [WORKSHOP] | |
In Proceedings of the 27th International Workshop on Description Logics (DL 2014), Vienna, Austria. | ||
[.pdf | .bib] | ||
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Hybrid Query Answering Over DL Ontologies | [WORKSHOP] | |
In Proceedings of the 27th International Workshop on Description Logics (DL 2014), Vienna, Austria. | ||
[.pdf | .bib] | ||
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Hybrid Query Answering Over OWL Ontologies | [CONFERENCE] | |
In Proceedings of the 21st European Conference on Artificial Intelligence (ECAI 2014), 2014. | ||
[.pdf | .bib] | ||
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HermiT: An OWL 2 Reasoner | [JOURNAL] | |
Journal of Automated Reasoning (JAR), 53(3):245-269, 2014. | ||
[.pdf | .bib] | ||
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Ontology-Based Data Access Using Rewriting, OWL 2 RL Systems and Repairing | ||
In Proceedings of the 11th European Semantic Web Conference (ESWC 2014), 2014. | [CONFERENCE] | |
[.pdf | .bib] | ||
![]() Watch the presentation given at ESWC 2014 | ||
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Query rewriting under query refinements | [JOURNAL] | |
Journal of Knowledge-Based Systems, p. 36-48, v. 56, 2014. | ||
[.pdf | .bib] | ||
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Query Extensions and Incremental Query Rewriting for OWL 2 QL Ontologies | [JOURNAL] | |
Journal on Data Semantics, v.3(1), p. 1-23, 2014. | ||
[.pdf | .bib] | ||
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Reasoning with Fuzzy Extensions of OWL and OWL 2 | [JOURNAL] | |
Journal of Knowledge and Information Systems, v. 40(1), p. 205-242, 2014. | ||
[.pdf | .bib] | ||
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Publications • 2013 | ||
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Optimising Resolution-Based Rewriting Algorithms for DL Ontologies | [WORKSHOP] | |
In Proceedings of the 26th Workshop on Description Logics (DL 2013). | ||
[.pdf | .bib] | ||
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Query Rewriting Under Ontology Evolution | [WORKSHOP] | |
In Proceedings of the 26th Workshop on Description Logics (DL 2013). | ||
[.pdf | .bib] | ||
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Computing Datalog Rewritings beyond Horn Ontologies | [CONFERENCE] | |
In Proceedings of the 23rd International Joint Conference on Artificial Intelligence (IJCAI-2013). | ||
[.pdf | .bib | TR (pdf)] | ||
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Storing and Querying Fuzzy Knowledge in the Semantic Web Using FiRE | [BOOK] | |
In Fernando Bobillo, Paulo CG Costa, et al. (eds) Uncertainty Reasoning for the Semantic Web II (Book). | ||
[.pdf | .bib] | ||
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Publications • 2012 | ||
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Tractable reasoning with vague knowledge using fuzzy EL++ | [JOURNAL] | |
Journal of Intelligent Information Systems, v. 39, p. 399-440, 2012. | ||
[DOI | .bib] | ||
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Query Rewriting Under Ontology Contraction | [CONFERENCE] | |
In Proceedings of the 6th International Conference on Web Reasoning and Rule Systems (RR2012), 2012. | ||
[.pdf | .bib] | ||
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Completeness Guarantees for Incomplete Ontology Reasoners: Theory and Practice | [JOURNAL] | |
Journal of Artificial Intelligence Research, v. 43, p. 419-476, 2012. | ||
[.pdf | .bib] | ||
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A Novel Approach to Ontology Classification | [JOURNAL] | |
Journal of Web Semantics: Science‚ Services and Agents on the World Wide Web‚ v. 14, p. 84-101, 2012. | ||
[DOI | .bib] | ||
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Benchmarking Ontology-based Query Rewriting Systems | [CONFERENCE] | |
In Proceedings of the 26th AAAI Conference on Artificial Intelligence (AAAI 2012) | ||
[.pdf | .bib] | ||
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Incremental Query Rewriting for OWL 2 QL | [WORKSHOP] | |
25th International Workshop on Description Logics (DL2012) | ||
[.pdf | .bib] | ||
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Publications • 2011 | ||
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What to ask to an incomplete Semantic Web reasoner? | [CONFERENCE] | |
In Proceedings of the 22nd International Joint Conference on Artificial Intelligence (IJCAI−2011). Pages 2226−2231. 2011. | ||
[.pdf | .bib] | ||
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Repairing Ontologies for Incomplete Reasoners | [CONFERENCE] | |
In Proceedings of the 10th International Semantic Web Conference (ISWC 2011). Springer LNCS. 2011. | ||
[.pdf | .bib] | ||
![]() Watch the presentation given at ISWC 2011 | ||
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Repairing Incomplete Reasoners | [CONFERENCE] | |
In Proceedings of the 24th International Workshop on Description Logics (DL 2011). CEUR. 2011 | ||
[.pdf | .bib] | ||
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Query Rewriting Under Query Extensions for OWL 2 QL Ontologies | [WORKSHOP] | |
In Proceedings of the 7th International Workshop on Scalable Semantic Web Knowledge Base Systems (SSWS2011). | ||
[.pdf | .bib] | ||
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Semantic Representation of Multimedia Content | [BOOK] | |
Paliouras G., Spyropoulos C., Tsatsaronis G. (eds), Knowledge-Driven Multimedia Extraction and Ontology Evolution, Springer | ||
[.pdf | .bib] | ||
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Reasoning for multimedia analysis | [BOOK] | |
R. Troncy, B. Huet and S. Schenk (eds.), Multimedia Semantics: Metadata, Analysis and Interaction, Wiley, 2011 | ||
[DOI | .bib] | ||
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Publications • 2010 | ||
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Optimising Ontology Classification | [CONFERENCE] | |
In Proceedings of the 9th International Semantic Web Conference (ISWC 2010). Vol. 6496 of LNCS. Pages 225−240. Springer Verlag. 2010. |
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Nominated for ISWC 2010 Best Paper | [.pdf | .bib] | |
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Completeness Guarantees for Incomplete Reasoners | [CONFERENCE] | |
In Proceedings of the 9th International Semantic Web Conference (ISWC 2010). | ||
Nominated for ISWC 2010 Best Paper | [.pdf | .bib] | |
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How Incomplete is your Semantic Web Reasoner? | [CONFERENCE] | |
In Proceedings of the 24th AAAI Conference on Artificial Intelligence (AAAI 2010), Pages 1431−1436. AAAI Press. 2010. | ||
Outstanding Paper Award Winner | ||
[.pdf | .bib] | ||
![]() Watch the presentation given at AAAI 2010 | ||
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Optimization Techniques for Fuzzy Description Logics | [WORKSHOP] | |
23rd International Workshop on Description Logics (DL 10), Waterloo, Canada, 2010 | ||
[.pdf | .bib] | ||
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Fuzzy extensions of OWL: Logical properties and reduction to fuzzy description logics | [JOURNAL] | |
International Journal of Approximate Reasoning (IJAR), 2010. | ||
[DOI | .bib] | ||
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Expressive reasoning with horn rules and fuzzy description logics | [JOURNAL] | |
Knowledge and Information Systems, Volume 25, Number 1, 105-136, 2010 | ||
[.pdf | .bib] | ||
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Publications • 2009 | ||
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A Framework for Reasoning with Expressive Continuous Fuzzy Description Logics | [WORKSHOP] | |
22nd International Workshop on Description Logics (DL-09), Oxford | ||
[.pdf | .bib] | ||
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Scalable Reasoning with Tractable Fuzzy Ontology Languages | [BOOK] | |
In Anne Laurent and Marie-Jeanne Lesot (Eds.) Scalable Fuzzy Algorithms for Data Management and Analysis: Methods and Design, IGI Global, 2009 | ||
[DOI | .bib] | ||
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Publications • 2008 | ||
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Representing Uncertainty Rules in RuleML | [JOURNAL] | |
Fundamenta Informaticae, Vol. 82, p. 1-24, 2008 | ||
[.pdf | .bib] | ||
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Image Indexing and Retrieval using Expressive Fuzzy Description Logics | [JOURNAL] | |
Signal, Image and Video Processing, Springer, Volume 2, Number 4, pp. 321-335, December 2008 | ||
[DOI | .bib] | ||
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Resolution of conflicts among ontology mappings: a fuzzy approach | [WORKSHOP] | |
International Workshop on Ontology Matching (OM2008), Karlsruhe, October 26, 2008 | ||
[.pdf | .bib] | ||
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Reasoning with Qualified Cardinality Restrictions in Fuzzy Description Logics | [CONFERENCE] | |
In Proceedings of the IEEE International Conference on Fuzzy Systems (Fuzz-IEEE 08) | ||
[.pdf | .bib] | ||
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Classifying Fuzzy Subsumption in Fuzzy-EL+ | [WORKSHOP] | |
21st International Workshop on Description Logics (DL 08), Dresden, Germany, 2008 | ||
[.pdf | .bib] | ||
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Scalable Querying Services over Fuzzy Ontologies | [CONFERENCE] | |
In Proceedings of the 17th International World Wide Web Conference (WWW 08), Beijing, 2008 | ||
[.pdf | .bib] | ||
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Storing and Querying Fuzzy Knowledge in the Semantic Web | [WORKSHOP] | |
7th International Workshop on Uncertainty Reasoning For the Semantic Web, Karlsruhe, Germany, October 2008 | ||
[.pdf | .bib] | ||
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Reasoning with Large A-Boxes in Fuzzy Description Logics using DL reasoners: An experimental evaluation | [WORKSHOP] | |
Workshop on Advancing Reasoning on the Web: Scalability and Commonsense | ||
[.pdf | .bib] | ||
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Reasoning with the Fuzzy Description Logic f-SHIN: Theory, Practice and Applications | [BOOK] | |
In Paulo CG Costa, Claudia d'Amato et al. (eds) Uncertainty Reasoning for the Semantic Web I (Book) | ||
[.pdf | .bib] | ||
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Tractable Reasoning Based on the Fuzzy EL++ Algorithm | [WORKSHOP] | |
7th International Workshop on Uncertainty Reasoning For the Semantic Web, Karlsruhe, Germany, October 2008 | ||
[.pdf | .bib] | ||
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Publications • 2007 | ||
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Reasoning with Very Expressive Fuzzy Description Logics | [JOURNAL] | |
Journal of Artificial Intelligence Research, 30, 8, 273-320 | ||
[.pdf | .bib] | ||
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Extending Fuzzy Description Logics for the Semantic Web | [WORKSHOP] | |
3rd International Workshop of OWL: Experiences and Directions, Innsbruck, 2007 | ||
[.pdf | .bib] | ||
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Expressive Querying over Fuzzy DL-Lite Ontologies | [WORKSHOP] | |
20th International Workshop on Description Logics, Brixen-Bressanone, Italy, 2007 | ||
[.pdf | .bib] | ||
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Expressive Reasoning with Horn Rules and Fuzzy Description Logics | [CONFERENCE] | |
In Proceedings of the 1st International Conference on Web Reasoning and Rule Systems, Innsbruck (Austria) | ||
[.pdf | .bib] | ||
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f-DLPs: Extending Description Logic Programs with Fuzzy Sets and Fuzzy Logic | [CONFERENCE] | |
IEEE International Conference on Fuzzy Systems (Fuzz-IEEE' 07), London, 2007 | ||
[.pdf | .bib] | ||
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Publications • 2006 | ||
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Uncertainty and the Semantic Web | [JOURNAL] | |
IEEE Intelligent Systems, 21(5), p. 84-87, 2006 | ||
[.pdf | .bib] | ||
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f-SWRL: A Fuzzy Extension of SWRL | [JOURNAL] | |
Data Semantics, special issue on Emergent Semantics, vol. 4090, p. 28-46, 2006 | ||
[.pdf | .bib] | ||
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An Approach to Representing Uncertainty Rules in RuleML | [CONFERENCE] | |
In Proceedings of the 2nd International Conference on Rules and Rule Markup Languages for the Semantic Web (RuleML-06), 2006 | ||
[.pdf | .bib] | ||
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Handling Imprecise Knowledge with Fuzzy Description Logic | [WORKSHOP] | |
International Workshop on Description Logics (DL 06), Lake District, UK, 2006 | ||
[.pdf | .bib] | ||
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General Concept Inclusions in Fuzzy Description Logics | [CONFERENCE] | |
In Proceedings of the 17th European Conference on Artificial Intelligence (ECAI 06), Riva del Garda, Italy, 2006 | ||
[.pdf | .bib] | ||
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Publications • 2005 | ||
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A String Metric For Ontology Alignment | [CONFERENCE] | |
In Proceedings of the 4th International Semantic Web Conference (ISWC 2005), Galway, 2005 | ||
[.pdf | .bib] | ||
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Uncertainty and RuleML rulebases: A Preliminary Report | [CONFERENCE] | |
In Proceedings of the 1st International Conference on Rules and Rule Markup Languages for the Semantic Web, Galway, 2005 | ||
[.pdf | .bib] | ||
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A Fuzzy Description Logic for Multimedia Knowledge Representation | [WORKSHOP] | |
International Workshop on Multimedia and the Semantic Web | ||
[.pdf | .bib] | ||
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Fuzzy OWL: Uncertainty and the Semantic Web | [WORKSHOP] | |
International Workshop of OWL: Experiences and Directions, Galway, 2005 | ||
[.pdf | .bib] | ||
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Multimedia Analysis and Annotation Requirements for the Semantic Web. | [WORKSHOP] | |
European Workshop on the Integration of Knowledge, Semantics and Digital Media Technologies (EWIMT), 2005 | ||
[ .bib] | ||
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The Fuzzy Description Logic f-SHIN | [WORKSHOP] | |
International Workshop on Uncertainty Reasoning For the Semantic Web (2005). | ||
[.pdf | .bib] | ||
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