5221 search results - page 615 / 1045 » An On-line Problem Database |
149
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EDBT
2008
ACM
16 years 7 months ago
2008
ACM
To carry out work assignments, small groups distributed within a larger enterprise often need to share documents among themselves while shielding those documents from others'...
176
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EDBT
2008
ACM
16 years 7 months ago
2008
ACM
Schema mapping algorithms rely on value correspondences ? i.e., correspondences among semantically related attributes ? to produce complex transformations among data sources. Thes...
183
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EDBT
2008
ACM
16 years 7 months ago
2008
ACM
We introduce a novel spatial join operator, the ring-constrained join (RCJ). Given two sets P and Q of spatial points, the result of RCJ consists of pairs p, q (where p P, q Q) ...
167
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EDBT
2008
ACM
16 years 7 months ago
2008
ACM
Estimating the number of distinct elements in a large multiset has several applications, and hence has attracted active research in the past two decades. Several sampling and sket...
164
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EDBT
2008
ACM
16 years 7 months ago
2008
ACM
We address the problem of generating a mediated schema from a set of relational data source schemas and conjunctive queries that specify where those schemas overlap. Unlike past a...