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DLOG
2011
13 years 16 days ago
2011
We show that, although conjunctive queries over OWL 2 QL ontologies are reducible to database queries, no algorithm can construct such a reduction in polynomial time without changi...
SIGMOD
2011
ACM
12 years 12 months ago
2011
ACM
An important means of allowing non-expert end-users to pose ad hoc queries — whether over single databases or data integration systems — is through keyword search. Given a set...
WWW
2008
ACM
14 years 9 months ago
2008
ACM
Query result caching is an important mechanism for search engine efficiency. In this study, we first review several query features that are used to determine the contents of a sta...
WWW
2007
ACM
14 years 9 months ago
2007
ACM
A number of existing information retrieval systems propose the notion of query context to combine the knowledge of query and user into retrieval to reveal the most exact descripti...
SIGMOD
2002
ACM
14 years 9 months ago
2002
ACM
We present a continuously adaptive, continuous query (CACQ) implementation based on the eddy query processing framework. We show that our design provides significant performance b...