Sebastian Hellmann

Sebastian Hellmann Johannisgasse 26, Zimmer 5-10 04103 Leipzig Tel.:   +49 341 97 32273 E-Mail, Research Group, Workpage, Homepage, rdfs:seeAlso

Research Interests

• extraction / reuse of knowledge
• database2owl conversion
• automatic training set composition for machine learning
• ontology modularization
• scalability in the Web of Data
• light-weight ontology engineering methods
• NLP2RDF is a framework for integrating NLP tools with the aim of producing RDF, which is also the topic of my thesis, see synopsis

Projects

• DL-Learner – is a tool for learning concepts in Description Logics (DLs) from user-provided examples. Equivalently, it can be used to learn classes in OWL ontologies from selected objects. The goal of DL-Learner is to support knowledge engineers in constructing knowledge and learning about the data they created.
• xOperator – combines advantages of social network websites with instant messaging. It tries to be a semantic agent for xmpp / jabber network which finds and shares content about resources (using RDF/SPARQL) for you and your jabber friends.

Publications

2010

• Sebastian Hellmann The Semantic Gap of Formalized Meaning submitted to the PHD Symposium ESWC 2010

2009

• Sebastian Hellmann, Claus Stadler, Jens Lehmann, Sören Auer: DBpedia Live Extraction. On the Move to Meaningful Internet Systems: OTM 2009, volume 5871, Springer, 1209–1223, Eds: Meersman, Robert, Dillon, Tharam, and Herrero, Pilar, 2009.
• Sören Auer, Jens Lehmann, Sebastian Hellmann: LinkedGeoData – Adding a Spatial Dimension to the Web of Data. In Proceedings of 8th International Semantic Web Conference (ISWC 2009).
• Jens Lehmann, Chris Bizer, Georgi Kobilarov, Sören Auer, Christian Becker, Richard Cyganiak, Sebastian Hellmann: DBpedia – A Crystallization Point for the Web of Data, Journal of Web Semantics, 2009
• Sören Auer, Sebastian Dietzold, Jens Lehmann, Sebastian Hellmann, David Aumueller: Triplify – Lightweight Linked Data Publication from Relational Databases, In: Proceedings of the World Wide Web Conference (WWW 2009), April 20–24, 2009, Madrid, Spain; ACM 978–1-60558–487-4/09/04, pp. 621–630, 2009
• Sebastian Hellmann, Jens Lehmann, Sören Auer: Learning of OWL Class Descriptions on Very Large Knowledge Bases. In: International Journal on Semantic Web & Information Systems, Special Issue on Scalability, Vol. 5, Issue 2, Pages 1–24, 2009.
• Philip Heim, Sebastian Hellmann, Jens Lehmann, Steffen Lohmann, Timo Stegemann(to appear) Rel Finder: Revealing Connections in RDF Knowledge Bases Proceedings of 4th International Conference on Semantic and Digital Media Technologies Springer
• Matthias Quasthoff, Sebastian Hellmann, Konrad Höffner Standardized Multilingual Language Resources for the Web of Data: http://corpora.uni-leipzig.de/rdf, 3rd prize at the LOD Triplification Challenge, Graz, 2009.
• Satya S. Sahoo, Wolfgang Halb, Sebastian Hellmann, Kingsley Uyi Idehen, Ted Thibodeau Jr., Sören Auer, Juan Sequeda, and Ahmed Ezzat A survey of current approaches for mapping of relational databases to RDF. Technical report, W3C, 2009.

2008

• Jörg Unbehauen, Michael Martin, Sebastian Hellmann, Sebastian Dietzold, Sören Auer xOperator – Chat with the Semantic Web, Challenge @ International Semantic Web Conference (ISWC) 2008 (Challenge Finalist), Poster
• Sebastian Hellmann, Jens Lehmann, Sören Auer: Poster: Learning of OWL Class Descriptions on Very Large Knowledge Bases, 7th International Semantic Web Conference (ISWC), 2008
• Sebastian Dietzold, Sebastian Hellmann and Martin Peklo: Using JavaScript RDFa Widgets for Model/View Separation inside Read/Write Websites. In: Proceedings of the 4th Workshop on Scripting for the Semantic Web,2008
• Sebastian Hellmann: Diploma Thesis: Comparison of Concept Learning Algorithms With Emphasis on Ontology Engineering for the Semantic Web (2008).

Slides

• ODBase 2009 Slides

Community service

I have been reviewing for:
Elsevier (JSPE), KEOD2009, ESWC 2009 (in-use), ISCS 2009, DEXA 2009, I-SEMANTICS 08
I'm a PC member at:
ESWC 2010 (in-use Track)

Seminars

• Entwicklung von Semantischen Webanwendungen (SS07)

Supervision of final theses

Um nicht bei jeder Betreuung von NULL anzufangen, sammle ich häufig empfohlene Links und Dateien auf Sebastian Dietzolds Betreuerseite.

Work in progress

• Collette Hagert: Database to OWL Converter (Diploma Thesis)