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CCCG
2009
14 years 10 months ago
Inapproximability of the Perimeter Defense Problem
We model the problem of detecting intruders using a set of infrared beams by the perimeter defense problem: given a polygon P, find a minimum set of edges S of the polygon such th...
Evangelos Kranakis, Danny Krizanc, Lata Narayanan,...
AB
2007
Springer
15 years 1 months ago
Efficient Haplotype Inference with Pseudo-boolean Optimization
Abstract. Haplotype inference from genotype data is a key computational problem in bioinformatics, since retrieving directly haplotype information from DNA samples is not feasible ...
Ana Graça, João Marques-Silva, In&ec...
CC
2007
Springer
121views System Software» more  CC 2007»
14 years 9 months ago
If NP Languages are Hard on the Worst-Case, Then it is Easy to Find Their Hard Instances
We prove that if NP ⊆ BPP, i.e., if SAT is worst-case hard, then for every probabilistic polynomial-time algorithm trying to decide SAT, there exists some polynomially samplable ...
Dan Gutfreund, Ronen Shaltiel, Amnon Ta-Shma
JSAT
2008
57views more  JSAT 2008»
14 years 9 months ago
tts: A SAT-Solver for Small, Difficult Instances
The Ternary Tree Solver (tts) is a complete solver for propositional satisfiability which was designed to have good performance on the most difficult small instances. It uses a st...
Ivor Spence
DBSEC
2006
160views Database» more  DBSEC 2006»
14 years 10 months ago
On Finding an Inference-Proof Complete Database for Controlled Query Evaluation
Abstract. Controlled Query Evaluation (CQE) offers a logical framework to prevent a user of a database from inadvertently gaining knowledge he is not allowed to know. By modeling t...
Joachim Biskup, Lena Wiese