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LATIN
2000
Springer
13 years 11 months ago
2000
Springer
The Flexible Job Shop problem is a generalization of the classical job shop scheduling problem in which for every operation there is a group of machines that can process it. The p...
APPROX
2000
Springer
13 years 12 months ago
2000
Springer
We consider a fault tolerant version of the metric facility location problem in which every city, j, is required to be connected to rj facilities. We give the first non-trivial ap...
STACS
2001
Springer
14 years 20 hour ago
2001
Springer
The stretch factor of a Euclidean graph is the maximum ratio of the distance in the graph between any two points and their Euclidean distance. Given a set S of n points in Rd, we ...
MFCS
2001
Springer
14 years 1 days ago
2001
Springer
We show that it is not possible to approximate the minimum Steiner tree problem within 1 + 1 162 unless RP = NP. The currently best known lower bound is 1 + 1 400. The reduction i...
COCOON
2004
Springer
14 years 1 months ago
2004
Springer
The problem of efficiently monitoring the network flow is regarded as the one to find out the minimum weighted weak vertex cover set for a given graph G = (V, E) with weight func...