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CONEXT
2008
ACM
14 years 11 months ago
ISP-friendly peer matching without ISP collaboration
In peer-to-peer (P2P) systems, a receiver needs to be matched with multiple senders, because peers have limited capacity and reliability. Efficient peer matching can reduce the co...
Cheng-Hsin Hsu, Mohamed Hefeeda
IPL
2000
82views more  IPL 2000»
14 years 9 months ago
Estimating the number of vertices of a polyhedron
Given a polyhedron P by a list of inequalities we develop unbiased estimates of the number of vertices and bases of P. The estimates are based on applying tree estimation methods ...
David Avis, Luc Devroye
COMPGEOM
2004
ACM
15 years 3 months ago
Solution of Scott's problem on the number of directions determined by a point set in 3-space
Let P be a set of n points in Ê3 , not all in a common plane. We solve a problem of Scott (1970) by showing that the connecting lines of P assume at least 2n − 7 different dir...
János Pach, Rom Pinchasi, Micha Sharir
CORR
2007
Springer
99views Education» more  CORR 2007»
14 years 9 months ago
Periodic complementary sets of binary sequences
Let PCSN p denote a set of p binary sequences of length N such that the sum of their periodic auto-correlation functions is a δ-function. In the 1990, B¨omer and Antweiler addres...
Dragomir Z. Djokovic
IANDC
1998
64views more  IANDC 1998»
14 years 9 months ago
Positive Versions of Polynomial Time
We show that restricting a number of characterizations of the complexity class P to be positive (in natural ways) results in the same class of (monotone) problems which we denote ...
Clemens Lautemann, Thomas Schwentick, Iain A. Stew...