Information Systems Group

― Knowledge Representation and Reasoning

Charalampos (Babis) Nikolaou

Research Assistant


I am a research assistant (postdoctoral researcher) at the Department of Computer Science of the University of Oxford and a member of the Knowledge Representation and Reasoning Group. I am primarily working with Professor Ian Horrocks and Professor Bernardo Cuenca Grau. I hold a PhD from the Department of Informatics and Telecommunications (DI&T) of the University of Athens where I worked on the topic of querying incomplete (geospatial) information in the data model RDF. My PhD advisor was Manolis Koubarakis. I hold an MSc and a Ptychion (4-year BSc) from DI&T and have been affiliated with the Management of Data, Information & Knowledge Group (MaDgIK) of DI&T since its founding in 2009. My research interests revolve around the areas of semantic web, artificial intelligence, and databases.

Recent Publications

Check my publications on the DBLP server.


Charalampos (Babis) Nikolaou


Research Assistant



Contact Information

Wolfson Building, Parks Road, Oxford OX1 3QD



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".