Information Systems Group

― Knowledge Representation and Reasoning

Knowledge Representation and Reasoning

The Knowledge Representation and Reasoning Group conducts research in knowledge representation formalisms, ontology languages, the design, implementation and optimisation of reasoning systems, and applications in areas such as e-Science and the Semantic Web.

Members of the group were centrally involved in the development of the World Wide Web Consortium (W3C) OWL ontology language, and are leading the development of its successor OWL2. They have also designed the logics and algorithms that underpin OWL(2), and have implemented these algorithms in highly optimised reasoning systems such as HermiT.

Studentships

The work done by doctoral students forms a crucial part of the research produced by the Knowledge Representation and Reasoning group, and new students are admitted to the group regularly. Visit the ISG studentships page for information on funding opportunities and the application process.

Latest Publications

  Evgeny Kharlamov, Luca Giacomelli, Evgeny Sherkhonov, Bernardo Cuenca Grau, Egor V. Kostylev, and Ian Horrocks.
SemFacet: Making Hard Faceted Search Easier. In Proceedings of the 2017 ACM on Conference on Information and Knowledge Management, CIKM 2017, Singapore, November 06 - 10, 2017, pages 2475–2478, 2017. [ DOI | http ]
  Evgeny Kharlamov, Luca Giacomelli, Evgeny Sherkhonov, Bernardo Cuenca Grau, Egor V. Kostylev, and Ian Horrocks.
Ranking, Aggregation, and Reachability in Faceted Search with SemFacet. In Nadeschda Nikitina, Dezhao Song, Achille Fokoue, and Peter Haase, editors, Proceedings of the ISWC 2017 Posters & Demonstrations and Industry Tracks co-located with 16th International Semantic Web Conference (ISWC 2017), Vienna, Austria, October 23rd - to - 25th, 2017, volume 1963 of CEUR Workshop Proceedings. CEUR-WS.org, 2017. [ http ]
  Evgeny Sherkhonov, Bernardo Cuenca Grau, Evgeny Kharlamov, and Egor V. Kostylev.
Semantic Faceted Search with Aggregation and Recursion. In Claudia d'Amato, Miriam Fernández, Valentina A. M. Tamma, Freddy Lécué, Philippe Cudré-Mauroux, Juan F. Sequeda, Christoph Lange, and Jeff Heflin, editors, The Semantic Web - ISWC 2017 - 16th International Semantic Web Conference, Vienna, Austria, October 21-25, 2017, Proceedings, Part I, volume 10587 of Lecture Notes in Computer Science, pages 594–610. Springer, 2017. [ DOI | http ]
  Alina Petrova, Evgeny Sherkhonov, Bernardo Cuenca Grau, and Ian Horrocks.
Entity Comparison in RDF Graphs. In The Semantic Web - ISWC 2017 - 16th International Semantic Web Conference, Vienna, Austria, October 21-25, 2017, Proceedings, Part I, pages 526–541, 2017. [ DOI | http ]
  Mark Kaminski, Bernardo Cuenca Grau, Egor V. Kostylev, Boris Motik, and Ian Horrocks.
Foundations of Declarative Data Analysis Using Limit Datalog Programs. In Proceedings of the Twenty-Sixth International Joint Conference on Artificial Intelligence, IJCAI-17, pages 1123–1130, 2017. [ DOI | http ]
  Michael Benedikt, Egor V. Kostylev, Fabio Mogavero, and Efthymia Tsamoura.
Reformulating Queries: Theory and Practice. In Carles Sierra, editor, Proceedings of the Twenty-Sixth International Joint Conference on Artificial Intelligence, IJCAI 2017, Melbourne, Australia, August 19-25, 2017, pages 837–843. ijcai.org, 2017. [ DOI | http ]
  David Tena Cucala, Bernardo Cuenca Grau, and Ian Horrocks.
Consequence-based Reasoning for Description Logics with Disjunction, Inverse Roles, and Nominals. In Proceedings of the 30th International Workshop on Description Logics, Montpellier, France, July 18-21, 2017, 2017. [ .pdf ]
  Charalampos Nikolaou, Egor V. Kostylev, George Konstantinidis, Mark Kaminski, Bernardo Cuenca Grau, and Ian Horrocks.
The Bag Semantics of Ontology-Based Data Access. In Carles Sierra, editor, Proceedings of the Twenty-Sixth International Joint Conference on Artificial Intelligence, IJCAI 2017, Melbourne, Australia, August 19-25, 2017, pages 1224–1230. ijcai.org, 2017. [ DOI | http ]
  Ilias Chalkidis, Charalampos Nikolaou, Panagiotis Soursos, and Manolis Koubarakis.
Modeling and Querying Greek Legislation Using Semantic Web Technologies. In The Semantic Web - 14th International Conference, ESWC 2017, Portorož, Slovenia, May 28 - June 1, 2017, Proceedings, Part I, pages 591–606, 2017. [ DOI | http ]
  Evgeny Kharlamov, Sebastian Brandt, Martin Giese, Ernesto Jiménez-Ruiz, Yannis Kotidis, Steffen Lamparter, Theofilos Mailis, Christian Neuenstadt, Özgür L. Özçep, Christoph Pinkel, Ahmet Soylu, Christoforos Svingos, Dmitriy Zheleznyakov, Ian Horrocks, Yannis E. Ioannidis, Ralf Möller, and Arild Waaler.
Enabling Semantic Access to Static and Streaming Distributed Data with Optique: Demo. In Proc. International Conference on Distributed and Event-based Systems (DEBS), pages 350–353, 2016.

Group Summary

News

3 Paper accepted in AAAI'18

Three papers co-authored by the KRR group have been accepted in AAAI'18:
- "Stream Reasoning in Temporal Datalog" by A. Ronca, M. Kaminski, B. Cuenca Grau, B. Motik, and I. Horrocks;
- "Optimised Maintenance of Datalog Materialisations" by P. Hu, B. Motik, and I. Horrocks; and
- "Goal-Driven Query Answering for Existential Rules with Equality" by M. Benedikt, B. Motik, and E. Tsamoura.

Professor Ian Horrocks is a new honorary doctorate at University of Oslo, Faculty of Mathematics and Natural Sciences

Professor Ian Horrocks received an honorary doctorate from the University of Oslo.

Best paper award at IJCAI'17

The paper entitled "Foundations of Declarative Data Analysis Using Limit Datalog Programs" and authored by M. Kaminski, B. Cuenca Grau, B. Motik, E. V. Kostylev, and I. Horrocks received the best paper award at the 26th International Joint Conference on Artificial Intelligence (IJCAI'17).

3 papers accepted in IJCAI'17

Three papers co-authored by the KRR group have been accepted in IJCAI'17:
- "Query Reformulation: Theory and Practice" by M. Benedikt, E. V. Kostylev, F. Mogavero, and E. Tsamoura;
- "Foundations of Declarative Data Analysis Using Limit Datalog Programs" by M. Kaminski, B. Cuenca Grau, B. Motik, E. V. Kostylev, and I. Horrocks; and
- "The Bag Semantics of Ontology-Based Data Access" by C. Nikolaou, E. V. Kostylev, G. Konstantinidis, M. Kaminski, B. Cuenca Grau, and I. Horrocks.

Paper accepted in PODS'17

The paper entitled "Benchmarking the chase" authored by Michael Benedikt, George Konstantinidis, Giansalvatore Mecca, Boris Motik, Paolo Papotti, Donatello Santoro, and Efthymia Tsamoura has been accepted in PODS'17.

Andrew Bate defends his PhD Thesis

Andrew Bate has successfully defended his PhD Thesis on Consequence Based Reasoning. Congratulations to Dr. Andrew Bate!

Best applications paper award at ISWC'16

Our paper entitled "Semantic Technologies for Data Analysis in Health Care" received the Best Applications Paper Award at the International Semantic Web Conference (ISWC 2016).

4 papers accepted in ISWC'16

Four papers authored by the KRR group have been accepted in the International Semantic Web Conference (ISWC 2016).

Best paper award at ICDT'16

Mark Kaminski and Egor Kostylev received the best paper award at ICDT 2016 for their paper entitled "Beyond Well-Designed SPARQL".