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» On Threshold BDDs and the Optimal Variable Ordering Problem
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VLDB
1987
ACM
108views Database» more  VLDB 1987»
15 years 9 months ago
Translating and Optimizing SQL Queries Having Aggregates
is at least ae powerful as SQL. Two well known relational query languages that have a sound theoretical foundation are relational algebra and relational calculus. As SQL is more cl...
Günter von Bültzingsloewen
EDBT
2012
ACM
247views Database» more  EDBT 2012»
13 years 8 months ago
Heuristics-based query optimisation for SPARQL
Query optimization in RDF Stores is a challenging problem as SPARQL queries typically contain many more joins than equivalent relational plans, and hence lead to a large join orde...
Petros Tsialiamanis, Lefteris Sidirourgos, Irini F...
CORR
2010
Springer
54views Education» more  CORR 2010»
15 years 5 months ago
Polynomial integration on regions defined by a triangle and a conic
We present an efficient solution to the following problem, of relevance in a numerical optimization scheme: calculation of integrals of the type ZZ T {f0} 12 dx dy for quadratic p...
David Sevilla, Daniel Wachsmuth
CDC
2009
IEEE
141views Control Systems» more  CDC 2009»
15 years 6 months ago
Decentralized receding horizon control for multiple unmanned helicopters considering dynamics model
In this paper, the formation flight of multiple Unmanned Helicopter (UH) systems is researched and a new decentralized receding horizon formation control algorithm is supposed. The...
Yuqing He, Jianda Han
ECAI
2006
Springer
15 years 9 months ago
Asynchronous Forward-Bounding for Distributed Constraints Optimization
A new search algorithm for solving distributed constraint optimization problems (DisCOPs) is presented. Agents assign variables sequentially and propagate their assignments asynchr...
Amir Gershman, Amnon Meisels, Roie Zivan