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A general variable neighborhood search for solving the uncapacitated single allocation $$p$$-hub median problem. (English) Zbl 1188.90142
Summary: We present a new general variable neighborhood search approach for the uncapacitated single allocation $$p$$-hub median problem in networks. This NP hard problem is concerned with locating hub facilities in order to minimize the traffic between all origin-destination pairs. We use three neighborhoods and efficiently update data structures for calculating new total flow in the network. In addition to the usual sequential strategy, a new nested strategy is proposed in designing a deterministic variable neighborhood descent local search. Our experimentation shows that general variable neighborhood search based heuristics outperform the best-known heuristics in terms of solution quality and computational effort. Moreover, we improve the best-known objective values for some large Australia Post and PlanetLab instances. Results with the new nested variable neighborhood descent show the best performance in solving very large test instances.

##### MSC:
 90B80 Discrete location and assignment 90C59 Approximation methods and heuristics in mathematical programming
PlanetLab
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