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We present the first lock-free implementation of an extensible hash table running on current architectures. Our algorithm provides concurrent insert, delete, and find operations with an expected O (1) cost. It consists of very simple code, easily implementable using only load, store, and...
In this article, we show several results obtained by combining the use of stable distributions with pseudorandom generators for bounded space . In particular:---We show that, for any p ∈ (0, 2, one can maintain (using only O (log n /ϵ 2 ) words of storage) a sketch C(q) of a point q ∈ l n p...
Device initialization is a difficult challenge in some proposed realizations of quantum computers, and as such, must be treated as a computational resource. The degree of initialization can be quantified by k , the number of clean qubits in the initial state of the register. In this article, we...
Protein-protein interactions, which form the basis for most cellular processes, result in the formation of protein interfaces. Believing that the local shape of proteins is crucial, we take a geometric approach and present a definition of an interface surface formed by two or more proteins as a...
The nominal approach to abstract syntax deals with the issues of bound names and α-equivalence by considering constructions and properties that are invariant with respect to permuting names. The use of permutations gives rise to an attractively simple formalization of common, but often...
We develop a new randomized rounding approach for fractional vectors defined on the edge-sets of bipartite graphs. We show various ways of combining this technique with other ideas, leading to improved (approximation) algorithms for various problems. These include:---low congestion multi-path...
We consider the generalized on-line two-server problem in which each server moves in its own metric space. Requests for service arrive one-by-one and every request is represented by two points: one in each metric space. The problem is to move, at every request, one of the two servers to its...
We present new results on the relation between purely symbolic context-free parsing strategies and their probabilistic counterparts. Such parsing strategies are seen as constructions of push-down devices from grammars. We show that preservation of probability distribution is possible under two...
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