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Graduate School of Management of Technology, Pukyong National University, Busan, 608-739, KoreaDepartment of Systems Management and Engineering, Pukyong National University, Busan, 608-739, KoreaThis paper considers an inbound lot-sizing and outbound dispatching problem for a single product in a third- party logistics (3PL) distribution center. Demands are dynamic and finite over the discrete time horizon, and moreover, each demand has a delivery time window which is the time interval with the dates between the earliest and the latest delivery dates All the product amounts must be delivered to the customer in the time window. Ordered products are shipped by multiple vehicle types and the freight cost is proportional to the vehicle-types and the number of vehicles used. First, we formulate a mixed integer programming model. Since it is difficult to solve the model as the size of real problem being very large, we design a conventional genetic algorithm with a local search heuristic (HGA) and an improved genetic algorithm called adaptive genetic algorithm (AGA). AGA spontaneously adjusts crossover and mutation rate depending upon the status of current population. Finally, we conduct some computational experiments to evaluate the performance of AGA with HGA.

An Adaptive Genetic Algorithm for a Dynamic Lot-sizing and Dispatching Problem with Multiple Vehicle Types and Delivery Time Windows