Dr. Yaser Oulabi
Credit: Emilie Orgler
Alumni Researcher
yaser (at) informatik.uni-mannheim.de
http://www.yaseroulabi.de
B6, 26, Room C 1.03
68159 Mannheim, Germany
Phone: +49 (0) 621 / 181-2737
About
Former researcher at the Chair of Information Systems V: Web-based Systems of Prof. Dr. Christian Bizer on the topic of expanding cross-domain knowledge bases using structured web data. In my research I focused on the tasks of Long-Tail Entity Extraction and Time-Dependent Data Fusion to augment knowledge bases like DBpedia or Wikidata using web table corpora provided by the Web Data Commons Project.
Research Interests
- Knowledge Base Completion
- Web Table Data Consolidation
- Long-Tail Entity Extraction
- Time-Dependent Web Data Fusion
- Weak Supervision
Published Datasets
Time-Dependent Ground-Truth Dataset
Ground truth of time-dependet data from various domains. The datset allows the development and evaluation of methods dealing with time-dependent data.
Web Tables for Long-Tail Entity Extraction
Gold standard for evaluating the extraction of long-tail entities from web tables. The dataset was built with the motivation of augmenting a cross-domain knowledge base with previously unknown entities from web data.
Code & Projects
Extracting Long Tail Entities from Web Tables for Augmenting Cross-Domain Knowledge Bases
Code und instructions on replicating our research on the extraction of long-tail entities from web tables and the use of weak supervision approaches for this task.
Time-Aware Fusion for Web Table Data
Code and instructions on replicating our research on the fusion of time-dependent data from web tables.
Publications
- Oulabi, Y. (2020). Augmenting cross-domain knowledge bases using web tables. Dissertation. Mannheim.
- Oulabi, Y. and Bizer, C. (2019). Extending cross-domain knowledge bases with long tail entities using web table data. In , Advances in Database Technology – 22nd International Conference on Extending Database Technology, EDBT 2019, Lisbon, Portugal, March 26–29, 2019 : proceedings (S. 385–396). , OpenProceedings.org: Konstanz.
- Oulabi, Y. and Bizer, C. (2019). Using weak supervision to identify long-tail entities for knowledge base completion. In , Semantic systems : The power of AI and knowledge graphs : 15th International Conference, SEMANTiCS 2019, Karlsruhe, Germany, September 9–12, 2019, proceedings (S. 83–98). Lecture Notes in Computer Science, Springer: Berlin [u.a.].
- Oulabi, Y. and Bizer, C. (2017). Estimating missing temporal meta-information using Knowledge-Based-Trust. In , KDWEB 2017 : proceedings of the 3rd International Workshop on Knowledge Discovery on the WEB Cagliari, Italy, September 11 to 12, 2017 (S. Paper 4). CEUR Workshop Proceedings, RWTH Aachen: Aachen, Germany.
- Oulabi, Y., Meusel, R. and Bizer, C. (2016). Fusing time-dependent web table data. In , WebDB '16 : Proceedings of the 19th International Workshop on Web and Databases, San Francisco, CA, USA, June 26, 2016 : co-located with ACM SIGMOD 2016 (S. Article 3, 1–7). , ACM: New York, NY.
- Ritze, D., Lehmberg, O., Oulabi, Y. and Bizer, C. (2016). Profiling the potential of web tables for augmenting cross-domain knowledge bases. In , Proceedings of the 25th International Conference on World Wide Web, WWW 2016, Montreal, Canada, April 11 – 15, 2016 (S. 251–261). , ACM: Geneva, Switzerland.