In this paper we present two recent metaheuristics, particle swarm optimization and differential evolution algorithms, to solve the single machine total weighted tardiness problem, which is a typical discrete combinatorial optimization problem. Most of the literature on both algorithms is concerned with continuous optimization problems, while a few deal with discrete combinatorial optimization problems. A heuristic rule, the smallest position value (SPV) rule, borrowed from the random key representation in genetic algorithms, is developed to enable the continuous particle swarm optimization and differential evolution algorithms to be applied to all permutation types of discrete combinatorial optimization problems. The performance of these two recent population based algorithms is evaluated on widely used benchmarks from the OR library. The computational results show that both algorithms show promise in solving permutation problems. In addition, a simple but very efficient local search method based on the variable neighbourhood search (VNS) is embedded in both algorithms to improve the solution quality and the computational efficiency. Ultimately, all the best known or optimal solutions of instances are found by the VNS version of both algorithms.
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Particle swarm optimization;
Single machine scheduling problem;
Total weighted tardiness
Document Type: Research Article
Department of Management, Fatih University, 34500 Buyukcekmece, Istanbul, Turkey
Department of Industrial Engineering and Management, Yuan Ze University, No. 135 Yuan-Tung Road, Chung-Li, Taoyuan County, Taiwan 320, ROC
Department of Industrial Engineering, Fatih University, 34500 Buyukcekmece, Istanbul, Turkey
Department of Management, Istanbul Kultur University, E5 Karayolu Uzeri, Sirinevler, Istanbul, Turkey
Publication date: 15 November 2006
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