Knowledge-Based Systems

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Knowledge-Based Systems

The research group Knowledge-Based Systems is concerned with methods for the intelligent management and processing of information in computer systems. This includes research questions from knowledge representation, reasoning and formal logic, but also covers topics related to databases and distributed systems. Important application areas of this research can be found in the fields of semantic technologies, artificial intelligence, and knowledge management.

The research group is affiliated with the Institute for Theoretical Computer Science.

Professors and Research Group Leaders


Prof. Dr. Markus Krötzsch


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Kati Michel


Sandy Seifarth

Scientific Staff

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Dr. David Carral

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M.Sc. Irina Dragoste

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Larry González

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Dipl.-Inf. Alexander Krause


Dipl.-Math. Maximilian Marx


Dr. Ana Ozaki


Dr.-Ing. Veronika Thost

Technical Administrators

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Petra Humann

Student Assistants

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Adrian Bielefeldt

  • Knowledge-Based Systems 

Former Members

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Dr. Long Cheng

  • Former Research Associate
  • Knowledge-Based Systems
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Fredo Erxleben

  • Former Student Assistant
  • Knowledge-Based Systems
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Julius Gonsior

  • Former Student Assistant
  • Knowledge-Based Systems
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Michael Günther

  • Former Graduate Assistant
  • Knowledge-Based Systems
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Dr. Tomáš Masopust

  • Former Research Associate
  • Knowledge-Based Systems

Georg Wild

  • Former Student Assistant
  • Knowledge-Based Systems

Newest Publications

View full publication list

Larry González, Aidan Hogan
Modelling Dynamics in Semantic Web Knowledge Graphs with Formal Concept Analysis
Proceedings of the 27th Web Conference (WWW), Lyon, France, April 23–27, 2018, to appear
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David Carral, Markus Krötzsch, Maximilian Marx, Ana Ozaki, Sebastian Rudolph
Preserving Constraints with the Stable Chase
In Benny Kimelfeld and Yael Amsterdamer, eds., Proceedings of the 21st International Conference on Database Theory (ICDT 2018), volume 98 of Leibniz International Proceedings in Informatics (LIPIcs), 12:1--12:19, March 2018. Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik
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Adrian Bielefeldt, Julius Gonsior, Markus Krötzsch
Practical Linked Data Access via SPARQL: The Case of Wikidata
Proceedings of the WWW2018 Workshop on Linked Data on the Web (LDOW-18), CEUR Workshop Proceedings, to appear.
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Markus Krötzsch
Recent Advances in Reasoning with Existential Rules
Presentation at the 2018 Workshop of the European Master in Computational Logic (EMCL), 2018
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David Carral, Pascal Hitzler, Hilmar Lapp, Sebastian Rudolph
On the Ontological Modeling of Trees
In Oscar Corcho, Matthew Horridge, David Carral, Rinke Hoekstra, eds., Proceedings of the 8th Workshop on Ontology Design and Patterns (WOP 2017) co-located with the 6th International Semantic Web Conference (ISWC 2017), Vienna, Austria, October 21, 2017., volume 2043, February 2018. CEUR Workshop Proceedings
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Tomáš Masopust, Markus Krötzsch
Deciding Universality of ptNFAs is PSpace-Complete
In A Min Tjoa, Ladjel Bellatreche, Stefan Biffl, Jan van Leeuwen, Jiri Wiedermann, eds., Proceedings of the 44th International Conference on Current Trends in Theory and Practice of Computer Science (SOFSEM 2018), volume 10706 of LNCS, 413-427, 2018. Spinger
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Tomáš Masopust
Complexity of Verifying Nonblockingness in Modular Supervisory Control
IEEE Transactions on Automatic Control, 63(2):602-607, 2018
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Tomáš Masopust
Complexity of Infimal Observable Superlanguages
IEEE Transactions on Automatic Control, 63(1):249-254, 2018
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Boris Konev, Carsten Lutz, Ana Ozaki, Frank Wolter
Exact Learning of Lightweight Description Logic Ontologies
Journal of Machine Learning Research, to appear
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Montserrat Hermo, Ana Ozaki
Exact Learning of Multivalued Dependency Formulas
Theoretical Computer Science, December 2017

View full publication list


Completed Theses




Data Integration and Access by Merging Ontologies and Databases

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Highly Adaptive Energy-Efficient Computing (Collaborative Research Centre SFB 912)

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High-Capacity Knowledge Processing Pipeline (HAEC Project B08)

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Semantic MediaWiki
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