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111
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IPL
2000
96views more  IPL 2000»
15 years 3 months ago
On bounded occurrence constraint satisfaction
An approximation algorithm for a constraint satisfaction problem is said to be nontrivial if its performance ratio is strictly superior to the expected performance of the algorith...
Johan Håstad
136
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CDC
2010
IEEE
101views Control Systems» more  CDC 2010»
14 years 10 months ago
Maintaining connectivity among multiple agents in cyclic pursuit: A geometric approach
This paper studies the connectivity maintenance problem in linear and nonlinear cyclic pursuit, when different control gains are assigned to each agent. Feasibility/infeasibility c...
Fabio Morbidi, Antonio Giannitrapani, Domenico Pra...
125
Voted
COMPGEOM
2006
ACM
15 years 7 months ago
Conflict-free colorings of shallow discs
We prove that any collection of n discs in which each one intersects at most k others, can be colored with at most O(log3 k) colors so that for each point p in the union of all di...
Noga Alon, Shakhar Smorodinsky
115
Voted
COMCOM
2006
70views more  COMCOM 2006»
15 years 3 months ago
Secret instantiation in ad-hoc networks
In this paper, we focus our attention on the problem of assigning initial secrets to users in ad-hoc network (respectively, sensors in a sensor network) so that they can use those...
Sandeep S. Kulkarni, Mohamed G. Gouda, Anish Arora
114
Voted
ACL
2010
15 years 1 months ago
Viterbi Training for PCFGs: Hardness Results and Competitiveness of Uniform Initialization
We consider the search for a maximum likelihood assignment of hidden derivations and grammar weights for a probabilistic context-free grammar, the problem approximately solved by ...
Shay B. Cohen, Noah A. Smith