My Latest Publications
- Analyzing Tag Semantics Across Collaborative Tagging Systems
- Testing and Evaluating Tag Recommenders in a Live System
- Towards Understanding Spammers - Discovering Local Patterns for Concept Characterization and Description
- ...
Topics of Interest
- 2.0
- bibsonomy
- clustering
- conference
- folksonomy
- learning
- mining
- myown
- ontology
- search
- semantic
- social
- tagging
- text
- tools
- toread
- web
- workshop
Interesting Links
- ACL Anthology Reference Corpus (ACL ARC)
- TAGora Sense Repository
- MPQA Releases
- hbz — Linked Open Data
- Fakultät für Mathematik und Informatik: Hörsaalbelegung
Interesting Publications
- FolksOntology: An Integrated Approach for Turning Folksonomies into Ontologies
- An Unsupervised Model for Exploring Hierarchical Semantics from Social Annotations
- Constructing folksonomies from user-specified relations on flickr
- Tagging Human Knowledge
- Contrasting Controlled Vocabulary and Tagging: Experts Choose the Right Names to Label the Wrong Things.
Books
About me
Currently, I'm a professor at the university of Würzburg. Prior, I was a senior researcher - here - at the university of Kassel. I'm working in the area of Data Mining, Semantic Web and Mining of Social Media. I'm directing the BibSonomy project at the KDE group of the university of Kassel. I started my research at the AIFB Institute at the University of Karlsruhe where I was working on text mining, ontology learning and semantic web related topics.
Activities
- Fachgruppe Knowledge Discovery, Data Mining und Maschinelles Lernen
- Co-Chair of "WG - Ubiquitous Data" of the KDUbiq project
Contact Information
University of Kassel
Department of Electrical Engineering/Computer Science
Knowledge and Data Engineering Group
Wilhelmshöher Allee 73
34121 Kassel
Room: 0445/A
Phone: ++49 561 804 6252
Fax: ++49 561 804 6259
Co-chaired Workshops 
- Workshop on Modeling Social Media 2010 (MSM'10) at Hypertext 2010, Toronto, Canada
- ECML PKDD Discovery Challenge 2009
- K-CAP 2009 - The Fifth International Conference on Knowledge Capture
- KASW'08: Workshop on Knowledge Acquisition from the Social Web
- ECML PKDD Discovery Challenge 2008
- ...
Special Sessions and Tracks
Conference PC Member
- NLDB 2010 - International Conference on Applications of Natural Language to Information Systems
- AI Lab - Events 2009
- EKAW 2010 Conference -- Knowledge Engineering and Knowledge Management by the Masses
- ECIR 2010 | The Annual European Conference on Information Retrieval
- WWW2010 – Raleigh: Home
- ...



