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186
Voted
CDB
2004
Springer
169views Database» more  CDB 2004»
16 years 10 days ago
Semantic Optimization of Preference Queries
Preference queries are relational algebra or SQL queries that contain occurrences of the winnow operator (find the most preferred tuples in a given relation). We present here a nu...
Jan Chomicki
183
Voted
DASFAA
2008
IEEE
168views Database» more  DASFAA 2008»
16 years 1 months ago
SemanticTwig: A Semantic Approach to Optimize XML Query Processing
Twig pattern matching (TPM) is the core operation of XML query processing. Existing approaches rely on either efficient data structures or novel labeling/indexing schemes to reduce...
Zhifeng Bao, Tok Wang Ling, Jiaheng Lu, Bo Chen
168
Voted
PDP
2009
IEEE
16 years 1 months ago
Two Formal Semantics of a Subset of the Paderborn University BSPlib
PUB (Paderborn University BSPLib) is a C library supporting the development of Bulk-Synchronous Parallel (BSP) algorithms. The BSP model allows an estimation of the execution time...
Frédéric Gava, Jean Fortin
175
Voted
ICS
1999
Tsinghua U.
15 years 11 months ago
High-level semantic optimization of numerical codes
This paper presents a mathematical framework to exploit the semantic properties of matrix operations in loop-based numerical codes. The heart of this framework is an algebraic lan...
Vijay Menon, Keshav Pingali
AI
2000
Springer
15 years 11 months ago
On the Integration of Recursive ALN-Theories
Abstract. In this paper we focus on the problem of integrating knowledge bases expressed in a description logic. To this end, we propose three basic operations: union, intersection...
Aida Vitória, Margarida Mamede