588 search results - page 13 / 118 » Positive higher-order queries |
SIGIR
2010
ACM
13 years 11 months ago
2010
ACM
Query reformulation techniques based on query logs have recently proven to be effective for web queries. However, when initial queries have reasonably good quality, these techniqu...
APWEB
2004
Springer
14 years 4 months ago
2004
Springer
In a state-of-the-art XML database, an XML query is evaluated as a sequence of structural joins in which positions of data nodes are used to perform each individual structural joi...
ICDT
2009
ACM
14 years 12 months ago
2009
ACM
We study containment and equivalence of (unions of) conjunctive queries on relations annotated with elements of a commutative semiring. Such relations and the semantics of positiv...
COLT
1999
Springer
14 years 3 months ago
1999
Springer
We study the learnability of Threshold functions with bounded weights using membership queries only. We show that the class Ct of Threshold functions with positive integer weights...
VLDB
2007
ACM
14 years 11 months ago
2007
ACM
A range of mobile services rely on knowing the current positions of populations of so-called moving objects. In the ideal setting, the positions of all objects are known always an...