Article ID: | iaor20101565 |
Volume: | 46 |
Issue: | 3 |
Start Page Number: | 363 |
End Page Number: | 381 |
Publication Date: | Mar 2010 |
Journal: | Journal of Global Optimization |
Authors: | Lucena Abilio, Ribeiro Celso C, Santos Andra C |
Keywords: | heuristics |
We propose a hybrid GRASP and Iterated Local Search (ILS) based heuristic for the diameter constrained minimum spanning tree problem. The latter typically models network design applications where, under a given quality requirement, all vertices must be connected at minimum cost. An adaptation of the one time tree heuristic is used to build feasible diameter constrained spanning trees. Solutions thus obtained are then attempted to be improved through local search. Four different neighborhoods are investigated, in a scheme similar to Variable Neighborhood Descent (VND). Upper bounds within 2% of optimality were obtained for problems in two test sets from the literature. Additionally, upper bounds stronger than those previously obtained in the literature are reported for OR-Library instances.