The Joint Optimization of Spare Parts and Maintenance Personel Under Lateral Transshipment This paper proposes an optimization approach to plan the maintenance personnel and spare parts in a multiple echelon stocking system. In this system, for each failure requested by group  pin P_j , if the jth local warehouse has available inventory, maintenance personnel with a spare part will be supplied by it, otherwise, the resources request will be routed to other warehouses. The optimal stock policy ( underlineS ) which can minimal total cost is the optimized target, including holding cost, ordering cost, maintenance cost and transshipment cost. A heuristic approach is used to obtain  underlineS . Using the heuristic methods, a complex system consisted of one plant, two central warehouses and three local warehouses is considered, the system served for three groups with two machines, and five modules is consisted in each equipment. The simulation results show the modelu0027s effectiveness.

Transshipment operations optimization of searail intermodal container in seaport rail terminals Abstract   This paper tackles the searail transshipment operation problem of seaport rail terminals, which includes two key subproblems involved in searail intermodal container transportation, namely train schedule template and transshipment plan of inbound containers. With limited resources and time constraints, operators need to decide the placedin and takenout time of trains to coordinate with vesselsxe2x80x99 unloading time and the transshipment plan of inbound containers (i.e. the amount of containers that are transshipped between different vessels and trains in each time slot) to maximize the number of directtransshipment containers while minimizing the storage time and dwell time of inbound containers. The problem is formulated as an integer programming model, and a tailored rolling horizon approach with the adaptive horizon and backtracking strategy is proposed. The performance of the algorithm is verified by a set of instances. The results suggest that the handling capacity of railmounted gantry cranes shows a more significant effect on the performance of transshipment operation than other factors. The negative effect caused by insufficient handling capacity could be alleviated by methods like prolonging the feasible service time of trains and enhancing the operational capacity of shunting engines.