A study of genotype and phenotype distributions in hybrid evolutionary algorithms to solve the flow shop scheduling problem

In this preliminary study the Flow Shop Scheduling Problem (FSSP) is solved by hybrid Evolutionary Algorithms. The algorithms are obtained as a combination of an evolutionary algorithm, which uses the Multi-Inver-Over operator, and two conventional heuristics (CDS and a modified NEH) which are applied either before the evolution begins or when it ends. Here we analyze the genotype and phenotype distribution over the final population of individuals trying to establish the algorithm behavior. Although the original Evolutionary Algorithm was created to provide solutions to the Traveling Salesman Problems (TSP), it can be used for this particular kind of scheduling problem because they share a common chromosome representation.Eje: Sistemas inteligentesRed de Universidades con Carreras en Informática (RedUNCI

A study of genotype and phenotype distributions in hybrid evolutionary algorithms to solve the flow shop scheduling problem

In this preliminary study the Flow Shop Scheduling Problem (FSSP) is solved by hybrid Evolutionary Algorithms. The algorithms are obtained as a combination of an evolutionary algorithm, which uses the Multi-Inver-Over operator, and two conventional heuristics (CDS and a modified NEH) which are applied either before the evolution begins or when it ends. Here we analyze the genotype and phenotype distribution over the final population of individuals trying to establish the algorithm behavior. Although the original Evolutionary Algorithm was created to provide solutions to the Traveling Salesman Problems (TSP), it can be used for this particular kind of scheduling problem because they share a common chromosome representation.Eje: Sistemas inteligentesRed de Universidades con Carreras en Informática (RedUNCI

An Efficient Hybrid Ant Colony System for the Generalized Traveling Salesman Problem

The Generalized Traveling Salesman Problem (GTSP) is an extension of the well-known Traveling Salesman Problem (TSP), where the node set is partitioned into clusters, and the objective is to find the shortest cycle visiting each cluster exactly once. In this paper, we present a new hybrid Ant Colony System (ACS) algorithm for the symmetric GTSP. The proposed algorithm is a modification of a simple ACS for the TSP improved by an efficient GTSP-specific local search procedure. Our extensive computational experiments show that the use of the local search procedure dramatically improves the performance of the ACS algorithm, making it one of the most successful GTSP metaheuristics to date.Comment: 7 page

Parallel ACO with a Ring Neighborhood for Dynamic TSP

The current paper introduces a new parallel computing technique based on ant colony optimization for a dynamic routing problem. In the dynamic traveling salesman problem the distances between cities as travel times are no longer fixed. The new technique uses a parallel model for a problem variant that allows a slight movement of nodes within their Neighborhoods. The algorithm is tested with success on several large data sets.Comment: 8 pages, 1 figure; accepted J. Information Technology Researc