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Improved Approximation of the General Soft-Capacitated Facility Location Problem

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    An NP-hard variant of the single-source Capacitated Facility Location Problem is studied, where each facility is composed of a variable number of fixed-capacity production units. This problem, especially the metric case, has been recently studied in several papers. In this paper, we only consider the general problem where connection costs do not systematically satisfy the triangle inequality property. We show that an adaptation of the set covering greedy heuristic, where the sub-problem is approximately solved by a Fully Polynomial-Time Approximation Scheme based on cost scaling and dynamic programming, achieves a logarithmic approximation ratio of (1+ƒÕ)H(n) for the problem, where n is the number of clients to be served, and H is the harmonic series. This improves the previous bound of 2H(n) for this problem.

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    File URL: http://www.essec.fr/faculty/showDeclFileRes.do?declId=3996&key=__workpaper__
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    Paper provided by ESSEC Research Center, ESSEC Business School in its series ESSEC Working Papers with number DR 05003.

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    Length: 17 pages
    Date of creation: Mar 2005
    Date of revision:
    Handle: RePEc:ebg:essewp:dr-05003
    Contact details of provider: Postal: ESSEC Research Center, BP 105, 95021 Cergy, France
    Web page: http://www.essec.edu/
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