Talks and Poster Presentations (with Proceedings-Entry):

S. Pirkwieser, G. Raidl:
"Multiple variable neighborhood search enriched with ILP techniques for the periodic vehicle routing problem with time windows";
Talk: International Workshop on Hybrid Metaheuristics (HM), Udine, Italien; 2009-10-16 - 2009-10-17; in: "Proceedings of Hybrid Metaheuristics - Sixth International Workshop", (2009), 45 - 59.

English abstract:
In this work we extend a VNS for the periodic vehicle routing
problem with time windows (PVRPTW) to a multiple VNS (mVNS)
where several VNS instances are applied cooperatively in an intertwined
way. The mVNS adaptively allocates VNS instances to promising areas
of the search space. Further, an intertwined collaborative cooperation
with a generic ILP solver applied on a suitable set covering ILP formulation
with this mVNS is proposed, where the mVNS provides the exact
method with feasible routes of the actual best solutions, and the ILP
solver takes a global view and seeks to determine better feasible route
combinations. Experimental results were conducted on newly derived instances
and show the advantage of the mVNS as well as of the hybrid
approach. The latter yields for almost all instances a statistically signi -
cant improvement over solely applying the VNS in a standard way, often
requiring less runtime, too.

Electronic version of the publication:

Created from the Publication Database of the Vienna University of Technology.