COST AND SERVICE-LEVEL-BASED MODEL FOR A SERU PRODUCTION SYSTEM FORMATION PROBLEM WITH UNCERTAIN DEMAND

摘要

With increasing demand diversification and short product lifecycles,industries now encounter challenges of demand uncertainty.The Japanese seru production system has received increased attention owing to its high efficiency and flexibility.In this paper,the problem of seru production system formation under uncertain demand is researched.A multi-objective optimization model for a seru production system formation problem is developed to minimize the cost and maximize the service level of the system.The purpose of this paper is to formulate a robust production system that can respond efficiently to the stochastic demand.Sample average approximation (SAA) is used to approximate the expected objective of the stochastic programming.The non-dominated sorting genetic algorithm Ⅱ (NSGA-Ⅱ) is improved to solve the multi-objective optimization model.Numerical experiments are conducted to test the tradeoffbetween cost and service level,and how the performance of the seru production system varies with the number of product types,mean and deviation of product volume,and skill-level-based cost.