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컨테이너터미널의 생산성 향상을 위한 하역시스템 운영방안
구평회(Pyung Hoi Koo) 한국SCM학회 2012 한국SCM학회지 Vol.12 No.2
This paper deals with operational strategies for loading/unloading in seaport container terminals. A variety of container handling facilities are cooperating with each other for loading/unloading operations. Among the logistics facilities, quay cranes, large dockside gantry cranes for loading and unloading containers from container ships, are a bottleneck resource that determines the system performance in most container terminals. The majority of the efficiency losses in the quay cranes are due to the failure of synchronization between quay cranes and yard trucks. This paper presents the concept of buffer employed for the interface between quay cranes and yard trucks for efficient use of quay cranes. For implementation of buffers, we consider buffer stations and reach stackers, which are expected to be employed in a minimum investment cost. Simulation experiments are performed to examine the performance for the new operational strategies. The managerial implications are discussed for industry applications.
구평회 ( Pyung Hoi Koo ) 한국경영공학회 2012 한국경영공학회지 Vol.17 No.3
This paper addresses a lot sizing problem for multiple products in the machines with high workload. In the highly-loaded machines, the products are often produced in lots to maximize capacity utilization by less setup losses. However, a large lot size may result in long production lead time and high WIP inventory level. We analyze the relationship among lot size, setup times, processing times, machine utilization, and lead time. Identifying that waiting time is much larger than the setup time in bottleneck machines with high machine utilization, we present a simple method to determine lot size for each of the multiple products with the objective of minimizing production lead time. Simulation experiments are carried out to verify the performance of the proposed lot sizing procedure.