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» On the Theory of Matchgate Computations
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342
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POPL
2006
ACM
16 years 7 months ago
Decidability and proof systems for language-based noninterference relations
Noninterference is the basic semantical condition used to account for confidentiality and integrity-related properties in programming languages. There appears to be an at least im...
Mads Dam
213
Voted
STOC
2004
ACM
134views Algorithms» more  STOC 2004»
16 years 7 months ago
Better extractors for better codes?
We present an explicit construction of codes that can be list decoded from a fraction (1 - ) of errors in sub-exponential time and which have rate / logO(1) (1/). This comes close...
Venkatesan Guruswami
STOC
2004
ACM
121views Algorithms» more  STOC 2004»
16 years 7 months ago
Lower bounds for dynamic connectivity
We prove an (lg n) cell-probe lower bound on maintaining connectivity in dynamic graphs, as well as a more general trade-off between updates and queries. Our bound holds even if t...
Mihai Patrascu, Erik D. Demaine
PODS
2006
ACM
134views Database» more  PODS 2006»
16 years 7 months ago
Finding global icebergs over distributed data sets
Finding icebergs ? items whose frequency of occurrence is above a certain threshold ? is an important problem with a wide range of applications. Most of the existing work focuses ...
Qi Zhao, Mitsunori Ogihara, Haixun Wang, Jun Xu
226
Voted
PODS
2007
ACM
159views Database» more  PODS 2007»
16 years 7 months ago
Generalized hypertree decompositions: np-hardness and tractable variants
The generalized hypertree width GHW(H) of a hypergraph H is a measure of its cyclicity. Classes of conjunctive queries or constraint satisfaction problems whose associated hypergr...
Georg Gottlob, Thomas Schwentick, Zoltán Mi...