Department of Computer Science
Gates Information Sciences, 4-A
Stanford, CA 94305-9040
+1 (415) 723-3118 (direct)
+1 (415) 723-0872 (Secretary)
+1 (415) 725-2588 (Fax)
Areas of Research:
Database system interoperation; semistructured data; data warehousing; federated database systems;
database system modeling; authorization and security mechanisms for database systems
Joachim Hammer is a member of the
database group at
Stanford University. His research
centers around the essential problem of integrating heterogeneous data from
a variety of (semi-)structured sources (e.g., database systems,
digital libraries, file systems, etc.) in order to simplify access and provide
a unified view of the underlying data. Joachim received his Ph.D. form the
University of Southern California in 1994.
One-page statements of research
- The TSIMMIS project (The Stanford IBM Manager of Multiple Information Sources) which provides a new approach to accessing, gathering and browsing heterogeneous,
semistructured information information from disparate sources.
- The WHIPS project (WareHousing Project at Stanford) which is developing
algorithms for incrementally maintaining views in the data warehouse. Other
research thrusts range from automatically detecting changes to the data stored
in the sources, to integrating new data with existing information in the
warehouse, to organizing the contents of the warehouse in order to optimize
multi-dimensional analysis and data mining, for example.
- Joint research project with Stanford's Knowledge System Laboratory (KSL)
group developing a formal framework for achieving interoperation among
heterogeneous information sources. This work is a continuation of my thesis
work with Prof. McLeod from
the CS Dept. at USC.
- Various technology transfers of TSIMMIS code to government agencies.
are available online in Postscript form. Alternatively, you may want to
use the database group publications
server to search for the desired paper.
Last modified: Monday, January 27, 1997