Varying fitness functions in genetic algorithm constrained optimization: the cutting stock and unit commitment problems

Abstract
In this paper, we present a specific varying fitness function technique in genetic algorithm (GA) constrained optimization. This technique incorporates the problem's constraints into the fitness function in a dynamic way. It consists in forming a fitness function with varying penalty terms. The resulting varying. fitness function facilitates the GA search. The performance of the technique is tested on two optimization problems: the cutting stock, and the unit commitment problems. Also, new domain-specific operators are introduced. Solutions-obtained by means of the varying and the conventional (nonvarying) fitness function techniques are compared. results show the superiority of the proposed technique.

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