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133
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DEXA
2003
Springer
15 years 8 months ago
2003
Springer
Query optimizers in current database management systems (DBMS) often face problems such as intolerably long optimization time and/or poor optimization results when optimizing compl...
168
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EDBT
2002
ACM
16 years 3 months ago
2002
ACM
Ontologies are set to play a key role in the "Semantic Web", extending syntactic interoperability to semantic interoperability by providing a source of shared and precise...
114
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CIKM
2009
Springer
15 years 10 months ago
2009
Springer
Bitmap indexes are widely used in Decision Support Systems (DSSs) to improve query performance. In this paper, we evaluate the use of compressed inverted indexes with adapted quer...
159
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ICDT
2010
ACM
15 years 5 months ago
2010
ACM
When a query is evaluated under bag semantics, each answer is returned as many times as it has derivations. Bag semantics has long been recognized as important, especially when ag...
133
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MDM
2005
Springer
15 years 9 months ago
2005
Springer
In this paper we propose a query-driven approach for tuning the time/energy trade-off in sensor networks with mobile sensors. The tuning factors include re-positioning of mobile s...