21342 search results - page 3739 / 4269 » A Structured Language Model |
165
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FOCS
1998
IEEE
15 years 9 months ago
1998
IEEE
This paper deals with the evaluation of acyclic Boolean conjunctive queries in relational databases. By well-known results of Yannakakis [1981], this problem is solvable in polynom...
155
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SIGOPSE
1998
ACM
15 years 9 months ago
1998
ACM
with this, the thread abstraction was introduced. While threads are handling events, or awaiting specific events, unrelated events can be handled by other threads. Unfortunately, ...
132
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ESA
1993
Springer
15 years 8 months ago
1993
Springer
A digraph is upward planar if it has a planar drawing such that all the edges are monotone with respect to the vertical direction. Testing upward planarity and constructing upward ...
161
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ICDT
2010
ACM
15 years 8 months ago
2010
ACM
Schema mapping composition is a fundamental operation in schema management and data exchange. The mapping composition problem has been extensively studied for a number of mapping ...
147
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EUROCAST
2007
Springer
15 years 8 months ago
2007
Springer
abstract Parsing schemata [4] provide a formal, simple and uniform way to describe, analyze and compare different parsing algorithms. The notion of a parsing schema comes from cons...