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» Query reformulation with constraints
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JFP
2007
104views more  JFP 2007»
13 years 10 months ago
Understanding functional dependencies via constraint handling rules
Functional dependencies are a popular and useful extension to Haskell style type classes. We give a reformulation of functional dependencies in terms of Constraint Handling Rules ...
Martin Sulzmann, Gregory J. Duck, Simon L. Peyton ...
SIGIR
2009
ACM
14 years 5 months ago
Multiple approaches to analysing query diversity
In this paper we examine user queries with respect to diversity: providing a mix of results across different interpretations. Using two query log analysis techniques (click entrop...
Paul Clough, Mark Sanderson, Murad Abouammoh, Serg...
VTC
2007
IEEE
14 years 5 months ago
Energy-Optimized Low-Complexity Control of Power and Rate in Clustered CDMA Sensor Networks with Multirate Constraints
—In this paper, we propose a low-complexity scheme for minimizing energy consumption in a clustered multirate CDMA sensor network with multiple receive antennas by jointly contro...
Chun-Hung Liu
LCC
1994
213views Algorithms» more  LCC 1994»
14 years 3 months ago
Linear Constraint Query Languages: Expressive Power and Complexity
We give an AC0 upper bound on the complexity of rst-oder queries over (in nite) databases de ned by restricted linear constraints. This result enables us to deduce the non-expressi...
Stéphane Grumbach, Jianwen Su, Christophe T...
EDBTW
2004
Springer
14 years 4 months ago
Query Answering in Peer-to-Peer Data Exchange Systems
The problem of answering queries posed to a peer who is a member of a peer-to-peerdataexchangesystemisstudied.Theanswershavetobeconsistentwrt to both the local semantic constraints...
Leopoldo E. Bertossi, Loreto Bravo