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구평회,장재진 한국경영과학회 2001 韓國經營科學會誌 Vol.26 No.1
Design and evaluation of AGV-based material handling systems are very complicated due to the randomness and the large number of variables involved. Vehicle travel time is a key parameter for designing and evaluating AGV systems. Although loaded travel time is relatively easy to estimate, determination of empty vehicle travel time is difficult due to the inherent randomness of material handling system. Most previous studies assume that the empty vehicle travel time is the same as the loaded travel time or assume very specific environments. This paper presents new vehicle travel time models for AGV-based material transport systems. The research effort is focused on the estimation of empty vehicle travel time under various vehicle dispatching policies. Simulation experiments are used to verify the proposed travel time models.
고시근,구평회,하재원,권혁무,김동준 한국품질경영학회 2004 품질경영학회지 Vol.32 No.2
The TOC/DBR and Six Sigma are the most attention-getting concepts for managing manufacturing companies in Korea. Using the ideas and methods of the TOC/DBR, companies can achieve a large reduction of work-in--process and finished-good inventories, significant improvement in scheduling performance, and substantial earnings increase. The Six Sigma approach derives the overall process of selecting the right projects based on their potential to improve performance metrics and selecting/training the right people to get the business results. These two concepts have different backgrounds and different viewpoints for production systems. So, if the two concepts collaborate each other, the synergy effects to innovate production systems can be expected. This paper proposes a new approach to implement the TOC/DBR concepts in production systems. This approach uses some concepts of Six Sigma which stresses educations, project approaches (step by step procedure using a Roadmap), and improvement philosophy.
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.
A berth planning approach with flexible quay crane assignments in seapor t container terminals
구평회 ( Pyung Hoi Koo ) 한국경영공학회 2013 한국경영공학회지 Vol.18 No.1
In seaport container terminals, the berth space is the most limited resource because of its tremendous investment and the geographical constraints associated with it. This paper addresses a berth planning problem under the assumption of multiple quay crane assignment options. Berth planning determines the berthing time and position of the container ships for loading/unloading services. An optimization model is presented for berth planning. For large problems, a heuristic procedure is proposed, which is based on a genetic algorithm. Experimental results are presented to see the performance of flexible quay crane assignment options and the proposed approach.