Using evolutionary computation and local search to solve multi-objective flexible job shop problems

  • Authors:
  • Nhu Binh Ho;Joc Cing Tay

  • Affiliations:
  • Nanyang Technological University;Nanyang Technological University

  • Venue:
  • Proceedings of the 9th annual conference on Genetic and evolutionary computation
  • Year:
  • 2007

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Abstract

Finding realistic schedules for Flexible Job Shop Problems has attracted many researchers recently due to its NP-hardness. In this paper, we present an efficient approach for solving the multi-objective flexible job shop by combining Evolutionary Algorithm and Guided Local Search. Instead of applying random local search to find neighborhood solutions, we introduce a guided local search procedure to accelerate the process of convergence to Pareto-optimal solutions. The main improvement of this combination is to help diversify the population towards the Pareto-front. Empirical studies show that 1) the gaps between the obtained results and known lower bounds are small, and 2) the multi-objective solutions of our algorithms dominate previous designs for solving the same benchmarks while incurring less computational time.