Hybrid NSGA-II for an imperfect production system considering product quality and returns under two warranty policies |
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Affiliation: | 1. Department of Industrial Engineering and Institute for Industrial Systems Innovation, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea;2. Data Driven User Experience team, Mobile Communication Lab, LG Electronics, 10 Magokjungang 10-ro, Gangseo-gu, Seoul 07796, Republic of Korea;1. Department of Industrial Engineering, Seoul National University, Seoul, Korea;2. H. Milton Stewart School of Industrial and Systems Engineering, Georgia Institute of Technology, North Ave NW, Atlanta, GA 30332, USA;3. Department of Industrial Engineering and Institute for Industrial Systems Innovation, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul, Korea |
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Abstract: | This study presents a new bi-objective mathematical model for an imperfect production system (IPS) that accounts for product returns and quality levels under two different warranty policies. We considered uncertain customer demand as stochastic behavior and product price as a function of return compensation, product quality level, and warranty-period length. We simultaneously looked at the pro rata warranty and free replacement/repair warranty policies and assumed that customers can choose the desired policy. A return policy for an online distributor was also included and two objective functions were used to address the problem. The first objective function maximized the total expected revenue, and the second objective function maximized customer satisfaction. The non-dominated sorting genetic algorithm (NSGA-II) and two others, the basic bee metaheuristic and teaching-learning-based optimization algorithms, were used to generate the initial solution for use in the NSGA-II algorithm. The results from the hybrid algorithms revealed that the proposed method improves the performance of the NSGA-II algorithm. Finally, several specific sensitivity analyses were conducted to determine the effects of the problem parameters. |
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Keywords: | Metaheuristics Non-dominated sorting genetic algorithm Product quality Warranty |
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