| Title: | Finding Patterns of Contradictory Data |
| Date: |
June 14, 2006 (Wednesday)
|
| Time: |
11:00 a.m. - 12:00 noon
|
| Venue: |
ERB513, William M.W. Mong Engineering Building,
The Chinese University of Hong Kong, Shatin, N.T. |
| Speaker: |
Professor Johann-Christoph Freytag
Humboldt-Universitaet zu Berlin Germany |
During data integration users are often faced with differences in the data that come from different sources. To find those differences during data integration and to resolve them efficiently is a major issue.
In this talk I address the problem of how to derive/generate "contradiction patterns" automatically using existing techniques from data mining. Those patterns potentially provide hints and suggestions to the "domain expert" where (and why) differences in the data exist (with what kind of "significance") - it's then up to him/her to decide if those difference are "real" and how to resolve them thus generating integrated data sources without contradictions.
BIOGRAPHY:
Johann-Christoph Freytag is currently full professor for databases and information systems at the Computer Science Department of the Humboldt- Universitaet zu Berlin, Germany. Before joining the department in 1994 he was a research staff member at the IBM Almaden Research Center (1985-1987), a researcher at the European Computer-Industry-Research Centre (ECRC, Munich, Germany, 1987-1989), and the head of Digital's Database Technology Center (also in Munich, 1990-1993). He holds a Ph.D. in Applied Mathematics/Computer Science from Harvard University, MA. Dr. Freytag's research interests include all aspects of query processing and query optimization in object-relational database systems, new developments in the database area (such as semi-structured data, data quality, databases and security), privacy in database systems, and applying database technology to applications such as GIS, genomics, and bioinformatics/life science. During last years he received the IBM Faculty Award 4 times for collaborative work in the areas of databases, middleware, and bioinformatics/life science. Currently, he is a member of the VLDB Endowment and the head of the German database interest group of the German Computer Society GI (Gesellschaft fˆ¢r Informatik). For more information please visit his web site http://www.dbis.informatik.hu-berlin.de/~freytag/.
Enquiries: Miss Temmy So at tel 2609 8444
For more information, please refer to http://www.cse.cuhk.edu.hk/seminar