Recently, multi-objective optimization by use of the genetic algorithms (GAs) is getting a growing interest as a novel approach to this problem. Population based search of GA is expected to find the Pareto optimal solutions of the multi-objective optimization problems in parallel. To achieve this goal, it is an intrinsic requirement that the evolution process of GA maintains well the diversity of the population in the Pareto optimality set. In this paper, the authors propose to utilize the Thermodynamical Genetic Algorithm (TDGA), a genetic algorithm that uses the concepts of the entropy and the temperature in the selection operation, for multi-objective optimization. Combined with the Pareto-based ranking technique, the computer simulation shows that TDGA can find a variety of Pareto optimal solutions.
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