[Talks] Brown CS Seminar: Kevin Chang talk in Lubrano on 4/13/2000 at 12:00 pm

Tue, 04 Apr 2000 13:53:37 -0400

PLEASE NOTE THAT THE DATE FOR THIS TALK HAS BEEN CHANGED TO 4/13/2000.

		   The Department of Computer Science
			    BROWN UNIVERSITY

			        presents

			Chen-Chuan Kevin Chang

			 Stanford University

		  Thursday, April 13, 2000 at 12:00 PM

	          Lubrano Conference Room (CIT 4th floor)

	          Refreshments will be served at 11:45 AM

 ``Query and Data Mapping across Heterogeneous Information Sources''

			       Abstract

The Internet has brought together information sources worldwide.
Integrating such heterogeneous and autonomous sources is challenging
because of their non-uniform query languages and data representations.
To help users uniformly query over different sources and access
desired data, we have developed an integration system for optimally
mapping queries and data across disparate contexts.  Such translation
technique is essential for many important applications that require
querying sources and analyzing data on the web, such as
meta-searching, e-commerce (comparison shopping), and web mining.

This talk will start with an overview of the integration system, which
consists of query translation, post-filtering, and data translation.
I will then focus on the query translator, the core of our framework.
In particular, I will present how we define a customizable metric of
closeness that combines both precision and recall, and how our general
algorithms handle inter-constraint dependencies correctly to guarantee
optimal mappings under virtually any closeness criteria.  I will then
discuss how to adopt this query mapping machinery for data translation
by developing the modeling of data as conjunctive queries.  Finally, I
will report our system prototype and some of the experimental results
for the post-filtering cost associated with query translation.

For more information, please refer to
http://www-db.stanford.edu/~kevin/thesis.html

		     Host: Professor Steve Reiss