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» Complexity of O'Hara's Algorithm
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ICDE
2008
IEEE
153views Database» more  ICDE 2008»
16 years 1 months ago
Increasing the Expressivity of Conditional Functional Dependencies without Extra Complexity
The paper proposes an extension of CFDs [1], referred to as extended Conditional Functional Dependencies (eCFDs). In contrast to CFDs, eCFDs specify patterns of semantically relate...
Loreto Bravo, Wenfei Fan, Floris Geerts, Shuai Ma
ICDE
2007
IEEE
113views Database» more  ICDE 2007»
16 years 1 months ago
Reducing Order Enforcement Cost in Complex Query Plans
Algorithms that exploit sort orders are widely used to implement joins, grouping, duplicate elimination and other set operations. Query optimizers traditionally deal with sort ord...
Ravindra Guravannavar, S. Sudarshan
CP
2009
Springer
16 years 1 months ago
The Complexity of Valued Constraint Models
The Valued Constraint Satisfaction Problem (VCSP) is a general framework encompassing many optimisation problems. We discuss precisely what it means for a problem to be modelled in...
Peter G. Jeavons, Stanislav Zivný
81
Voted
STACS
2010
Springer
15 years 7 months ago
Unsatisfiable Linear CNF Formulas Are Large and Complex
We call a CNF formula linear if any two clauses have at most one variable in common. We show that there exist unsatisfiable linear k-CNF formulas with at most 4k2 4k clauses, and ...
Dominik Scheder
94
Voted
ICS
2009
Tsinghua U.
15 years 7 months ago
Adagio: making DVS practical for complex HPC applications
Power and energy are first-order design constraints in high performance computing. Current research using dynamic voltage scaling (DVS) relies on trading increased execution time...
Barry Rountree, David K. Lowenthal, Bronis R. de S...