4.5 Article

An investigation of nature inspired algorithms on a particular vehicle routing problem in the presence of shift assignment

Journal

COMPUTERS & OPERATIONS RESEARCH
Volume 141, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cor.2021.105685

Keywords

Workforce scheduling; Vehicle routing; Dynamic neighbour generation; Multi objective optimization; Evolutionary algorithms

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This study combines workforce scheduling and vehicle routing problems, introducing the vehicle routing problem with shift assignment (VRP_SA). Three novel solution techniques based on dynamic neighbor generation are introduced, offering promising and robust results in large-sized problem instances. The dynamic neighbor generation framework can be extended to enhance exploration capability of other multi-objective optimization algorithms, providing an alternative development facility for solving multi-objective optimization problems.
Scheduling and routing processes are indispensable while planning most of the business operations. These processes that can help to improve each other's efficiency are generally treated separately. This paper brings workforce scheduling and vehicle routing problems together in a way that has never been done before and consequently vehicle routing problem in the presence of shift assignment (VRP_SA) is introduced to the literature. After building the mathematical model of the problem it is verified on a solver and then real large-sized instances taken from a company are solved using a set of evolutionary algorithms. Three novel solution techniques are introduced based on our framework called dynamic neighbour generation. As one of the contributions of this study, dynamic neighbour generation framework may easily be extended to include other multi objective optimization algorithms to increase their exploration capability, and thus it offers an alternative development facility for solving multi objective optimization problems. Results of computational experiments show that the proposed framework definitely offers promising and robust results in large sized problem instances in terms of hypervolume and inverted generational distance indicators.

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