<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000'>Hi all,<br><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><br>Theodore Johnson will be visiting the department from ATT Labs on<br>Wednesday, October 24. He'll be giving a talk about Data Stream<br>Warehousing.<br><br>The talk will be 12 noon to 1:30 pm, in Room 302.<br><br><br>Abstract:<br>Data stream processing is a well-studied area that has led to<br>many commercial offerings. Stream processing systems typically<br>store only a small history of a stream, and provide services<br>such as real-time alerting and visualization, and data<br>reduction for downstream processing. However many applications<br>also require that long term (e.g. 2 year) histories<br>as well as real-time data be provided to analysts. A stream<br>warehouse combines aspects of data stream processing (continual<br>data ingest) with data warehousing (long-term storage and<br>materialized views). I will discuss special issues and<br>opportunities that arise in stream warehousing, and stream<br>warehouse applications within AT&T Labs - Research.<br><br>Bio:<br>Theodore Johnson received a PhD in Computer Science from New York<br>University in 1990. From 1990 through 1996, he was an Associate Professor<br>at the CISE department of the University of Florida. In 1996, Ted moved to<br>the Database Research group of AT&T Labs - Research and has been there since.<br>Ted has specialized in data steam management systems, being one of the<br>principal authors of the GS Tool (previously, Gigascope) and of the DataDepot<br>stream warehouse. Ted has written two books, Distributed Operating Systems and<br>Algorithms (with Randy Chow) and Exploratory Data Mining and Data Cleaning<br>(with Tamraparni Dasu).<br><br><br>-- <br>Ari Rabkin asrabkin@gmail.com<br>Princeton Computer Science Department<br></div><br></div></body></html>