Título: | MODELS AND ALGORITHMS TO THE TEAM ORIENTEERING PROBLEM | ||||||||||||||||||||||||||||||||||||||||||||
Autor: |
FRANCISCO HENRIQUE DE FREITAS VIANA |
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Colaborador(es): |
MARCUS VINICIUS SOLEDADE POGGI DE ARAGAO - Orientador EDUARDO UCHOA BARBOZA - Coorientador |
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Catalogação: | 18/MAI/2012 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=19542&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=19542&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.19542 | ||||||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||||||
Team Orienteering Problem is a vehicle routing problem on a graph with
durations associated to the arcs and profits assigned to visiting the vertices.
In this problem, a fleet with a fixed number of identical vehicles performs
the visitations and there is a limited total duration for the routes to be
ended up. Each vertex can be visited at most once and the solution does
not have the obligation to visit all vertices, due to the constraint that limits
the maximum duration of routes. The goal of the problem is to maximize
the total profit gathered by all routes. In this work, two approaches have
been proposed: an exact and a heuristic one. In the exact approach, we have
developed an arc based formulation and an extended formulation where each
arc has an extra index. This index represents the departure time of a vehicle
using an arc. Through transformations on the extended formulation, we have
obtained a formulation, whose relaxation - the restricted master problem -
is solved using the column generation technique. A dynamic programming
algorithm solves the column generation subproblem in pseudo-polynomial
time. This algorithm generates non-elementary routes that allow subcycles.
In order to cut off the subcycles, a new class of inequalities called min cut has
been proposed.We have applied a Branch-Cut-and-Price (BCP) algorithm.
This allowed finding some new upper bounds. The exact approach has
achieved competitive results compared to the best exact algorithm has
already proposed to this problem. In the heuristic approach, besides a kopt
neighborhood, we have also exploited an ellipsoidal search that adds a
new cut constraint to the formulation of Branch-Cut-and-Price algorithm.
This new cut reduces the space search to a neighborhood around a known
set of solutions. This search is used as a crossover operator that runs all
iterations of a evolutive algorithm. This approach converges in a reasonable
computational time and finds optimal or near optimal solutions for some
instances in the literature.
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