I am a research fellow in the Knowledge Discovery and Machine Learning Group of the Department of Computer Science at University of Bonn and also in the Knowledge Discovery Team of the Fraunhofer Institute for Intelligent Analysis and Information Systems (IAIS) in Sankt Augustin, Germany.

My primary research interests are in machine learning and data mining. In particular, I am interested in learning in logic, multirelational data mining, graph mining, and applications in computational biology and chemistry.

Publications

(incomplete list)

• Frequent Subgraph Mining in Outerplanar Graphs
  
  • with J. Ramon and S. Wrobel
  • Data Mining and Knowledge Discovery (in press).
• Listing Closed Sets of Strongly Accessible Set Systems with Applications to Data Mining
  
  • with M. Boley, A. Poigné, and  S. Wrobel
  • Theoretical Computer Science, 411(3): 691-700, 2010.
• Efficient Discovery of Interesting Patterns based on Strong Closedness
  
  • with M. Boley and  S. Wrobel
  • Statistical Analysis and Data Mining, 2(5-6):346-360, 2009.
• Notes on recent approaches concerning the Kirchhoff-Law--Johnson-noise-based secure key exchange
  
  • with L.B. Kish
  • Physics Letters A, 373:2858-2868, 2009.
• A Logic-Based Approach to Relational Extraction from Texts
  
  • with G. Paaß, F. Reichartz, and  S. Wrobel
  • 19th International Conference on Inductive Logic Programming (accepted)
• New Results on Listing Closed Sets of Strongly Accessible Set Systems
  
  • with M. Boley, A. Poigné, and  S. Wrobel
  • 7th International Workshop on Mining and Learning with Graphs (accepted)
• Efficient Discovery of Interesting Patterns based on Strong Closedness
  
  • with M. Boley and  S. Wrobel
  • In Proceedings of the SIAM International Conference on Data Mining (SDM), pp. 1002-1013, SIAM, 2009.
• Efficient Frequent Connected Subgraph Mining in Graphs of Bounded Treewidth
  • with  J. Ramon
  • In Proceedings of Machine Learning and Knowledge Discovery in Databases, European Conference (ECML PKDD), LNAI 5211, pp. 520-535, Springer-Verlag, Heidelberg, 2008.

• Support Vector Machine-Based Ranking Significantly Improves the Effectiveness of Similarity Searching Using 2D Fingerprints and Multiple Reference Compounds
  
  • with J. Bajorath, T. Gärtner, H. Geppert, and S. Wrobel
  • Journal of Chemical Information and Modeling, 48(4):742–746, 2008.
• Efficient Closed Pattern Mining in Strongly Accessible Set Systems (extended abstract)
  
  • with M. Boley, A. Poigné, and  S. Wrobel
  • In Proceedings of the 11th European Conference on Principles and Practice of Knowledge Discovery in Databases (PKDD), LNAI 4702, pp. 382-389, Springer-Verlag, Heidelberg, 2007.
• Frequent Hypergraph Mining
  
  • with B. Bringmann and L. De Raedt 
  • In Proceedings of the 16th International Conference on Inductive Logic Programming, LNAI 4455, pp. 247-259, Springer-Verlag, Heidelberg, 2007.
• Kernel Methods for Graphs
  
  • with T. Gärtner, Q. Le, A. Smola, and S. Wrobel
  • In D.J. Cook and L.B. Holder (Eds.), Mining Graph Data, pp. 253-282,
    John Wiley & Sons, Inc., New York, 2007.
• A Refinement Operator for Outerplanar Graphs (extended abstract)
  • with T. Akutsu and S. Wrobel
  • In Proceedings of the 16th International Conference of Inductive Logic Programming, pp. 95–97, Technical Report, University of Corunna, 2006.
• Frequent Subgraph Mining in Outerplanar Graphs
  
  • with J. Ramon and S. Wrobel
  • In Proceedings of the 12th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, pp. 197–206, ACM Press, New York, NY, 2006.
• Kernels for Predictive Graph Mining
  
  • with T. Gärtner and S. Wrobel
  • In M. Spiliopoulou, R. Kruse, A. Nurnberger, C. Borgelt, and W. Gaul (Eds.), From Data and Information Analysis to Knowledge Engineering, Series: Studies in Classification, Data Analysis, and Knowledge Organization,
    pp. 75 – 86, Springer-Verlag, Heidelberg, 2006.
• Effective Rule Induction from Labeled Graphs
  
  • with S. Hoche and S. Wrobel
  • In Proceedings of the 21st Annual ACM Symposium on Applied Computing, pp. 611–616, ACM Press, New York, NY, 2006.
• Cyclic Pattern Kernels Revisited
  • In Proceedings of the 9th Pacific-Asia Conference on Knowledge Discovery and Data Mining, LNAI 3518, pp. 791–801, Springer-Verlag, Heidelberg, 2005.
• Cyclic Pattern Kernels for Predictive Graph Mining
  • with T. Gärtner and S. Wrobel
  • In Proceedings of the 10th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, pp. 158–167, ACM Press, New York, NY, 2004.
• Learning Logic Programs with Unary Partial Function Graph Background Knowledge
  
  • with R. H. Sloan and G. Turan
  • In L. De Raedt and T. Washio (Eds.), Proceedings of the 1st International Workshop on Mining Graphs, Trees, and Sequences, pp. 33–44, ECML/PKDD workshop proceedings, 2003.
• Towards Discovery of Deep and Wide First-Order Structures: A Case Study in the Domain of Mutagenicity
  
  • with S. Wrobel
  • In Proceedings of the 4th International Conference on Discovery Science, LNAI 2226, pp. 100–112, Springer-Verlag, Heidelberg, 2001.
• Learning Logic Programs with Structured Background Knowledge
  
  • with G. Turan
  • Artificial Intelligence, 128(1–2):31–97, 2001.
• Relational Instance-Based Learning with Lists and Terms
  
  • with U. Bohnebeck and S. Wrobel
  • Machine Learning, 43(1/2):53–80, 2001. 
• Distance-Based Approaches to Relational Learning and Clustering
  • with M. Kirsten and S. Wrobel 
  • In N. Lavrac and S. Dzeroski, (Eds.), Relational Data Mining, pp. 213–233, Springer-Verlag, New York, 2001.

CV (Curriculum Vitae)

• Education:
  • Ph.D. in computer science (University of Magdeburg)
  • M.Sc. and B.Sc. in computer science (University of Szeged)

• Career/Employment
  
  • 1997 - present:  research fellow
       Knowledge Discovery Group at Fraunhofer IAIS
       Schloss Birlinghoven, Sankt Augustin, Germany (formerly GMD)
  • 2008 - present, 2006, and 2002 - 2004: research fellow
       Knowledge Discovery and Machine Learning Group,
       Department of Computer Science III, University of Bonn
  • 1994 - 1997: assistant lecturer
       Institute of Informatics, University of Szeged
  • 1987 - 1994: research associate
       Research Group on the Theory of Automata,
       Hungarian Academy of Sciences, Szeged

• Projects
  • DFG project WR 40/2-2, Hybride Methoden und Systemarchitekturen für heterogene Informationsräume
  • DFG project WR 40/2-1, Hybride Methoden und Systemarchitekturen für heterogene Informationsräume
  • ESPRIT IV Project 20237 ILP2, Inductive Logic Programming II
  • ESPRIT III BR Project 6020 ILP, Inductive Logic Programming