Exact formulation and analysis for the bi-objective insular traveling salesman problem
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Fecha
2021-11-01
Profesor/a Guía
Facultad/escuela
Idioma
en
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MDPI
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Licencia CC
Attribution 4.0 International
CC BY 4.0
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Licencia CC
https://creativecommons.org/licenses/by/4.0/
Resumen
This paper aims at studying the Bi-Objective Insular Traveling Salesman Problem (BO-InTSP), which searches for a set of efficient, single visit sequences to collect (or distribute) freight from a set of islands. In this problem, the selection of ports (nodes) to be visited at each island, along with the associated port visit sequence, are optimized simultaneously, while the maritime transportation costs and the ground transportation costs inside the islands are minimized with a bi-objective perspective. This approach is employed since these costs are of a conflictive nature. A previous Approximated Formulation of the BO-InTSP relies on aggregating the actual demand locations within each island in a certain number of centroids for computing the ground transportation costs. Conversely, this paper proposes and develops a novel Exact Formulation for the problem based on the actual demand locations, instead of aggregating the demand inside the islands. Additionally, a systematic evaluation approach is developed to compare the two alternative formulations with different levels of demand aggregation inside the islands, considering the bi-objective nature of the problem. The results reveal that the novel Exact Formulation significantly outperforms the previous aggregated approach in terms of the solutions quality and computational resources. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Notas
Indexación: Scopus.
Palabras clave
Bi-objective optimization, Freight collection or distribution, Ground transportation costs, Insular traveling salesman problem, Isolated regions, Multi-objective analysis
Citación
Mathematics, Volume 9, Issue 21, November-1 2021, Article number 2641
DOI
10.3390/math9212641