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» On the Power of the Randomized Iterate
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FOCS
2008
IEEE
16 years 26 days ago
Beating the Random Ordering is Hard: Inapproximability of Maximum Acyclic Subgraph
We prove that approximating the Max Acyclic Subgraph problem within a factor better than 1/2 is Unique-Games hard. Specifically, for every constant ε > 0 the following holds:...
Venkatesan Guruswami, Rajsekar Manokaran, Prasad R...
CORR
2006
Springer
107views Education» more  CORR 2006»
15 years 6 months ago
Dense Gaussian Sensor Networks: Minimum Achievable Distortion and the Order Optimality of Separation
We investigate the optimal performance of dense sensor networks by studying the joint source-channel coding problem. The overall goal of the sensor network is to take measurements...
Nan Liu, Sennur Ulukus
MONET
2006
157views more  MONET 2006»
15 years 6 months ago
Connectivity in Wireless Ad-hoc Networks with a Log-normal Radio Model
In this paper we study connectivity in wireless ad-hoc networks by modeling the network as an undirected geometric random graph. The novel aspect in our study is that for finding t...
Ramin Hekmat, Piet Van Mieghem
DATE
2007
IEEE
95views Hardware» more  DATE 2007»
16 years 22 days ago
Memory bank aware dynamic loop scheduling
In a parallel system with multiple CPUs, one of the key problems is to assign loop iterations to processors. This problem, known as the loop scheduling problem, has been studied i...
Mahmut T. Kandemir, Taylan Yemliha, Seung Woo Son,...
GLOBECOM
2006
IEEE
16 years 14 days ago
Harnessing the Parity of Multiple Errors in End-to-End MAC Schemes
— We present the results of simulation experiments that compare end-to-end error management (used in controlled access MAC protocols) against hop-by-hop error management (used in...
Ghassen Ben Brahim, Bilal Khan, Ala I. Al-Fuqaha, ...