Controlling industrial vehicle operated by human in warehouse was not simple since the information transfer for controlling the vehicle was not easy. However, as the technology for the WMS(Warehouse Management System) has been advanced and the PDA(Personal Digital Assistant) has come into wide use in a workplace, the control of man-operated vehicle became less difficult as do to AGVS(Automated Guided Vehicle System). This study examines the ways to improve the efficiency of warehouse operation through introducing rule of task assignment for the vehicles, particularly forklift. This study, basically, refer to AGV operation policy because a great number of studies for AGV dispatching rule have been done and the mechanism for the controlling vehicles is very similar. The workers in field prefer to simple dispatching rules such as Shortest Retrieval Time First(SRTF), Shortest Travel Time First(STTF), and Longest Waiting Load First(LWLF). However, these rules have potential disadvantage. Thus, several rules made up by combining rules mentioned above are introduced and these new rules use threshold value or evaluation formula. The effectiveness of these new rules are tested by simulation and the results are compared. This study proposes favorable dispatching rules for forklift in warehouse for the efficiency of the vehicle operation and stability of service level.

In this study, the importance of win-win collaboration was emphasized in the point of long term partnership between parent companies and cooperation companies. Although parent company is trying to enhance internal capacity in setting up global management quality system as a standard model of national quality award, interest and effort in building inter-business management quality system linked with cooperation company are not enough. So win-win quality management system in long term viewpoint should be established to reinforce inter-business global management quality competitiveness.

This paper addresses the facility layout problem in multi-bay environments, where the bays are connected at one or both ends by an inter-bay material handling system In most previous studies, the main concern is to allocate facilities or departments to th

Most approaches for continuous review inventory problem need tables for loss function and cumulative standard normal distribution. Furthermore, it is time-consuming to calculate order quantity (Q) and reorder point (r) iteratively until required values ar

결명자차, 녹차 및 밤차가 인체의 생체기능활성화에 미치는 영향을 알아보기 위하여 국소뇌혈류량 및 혈압, in vitro상에서의 면역세포의 활성화, 그리고 암세포가 이식된 동물에서의 면역세포 활성화와 암세포의 증식억제 효과를 관찰한 결과 다음과 같은 결론을 얻었다. 1. 단당류는 현미녹차와 결명자차에는 glucose, galactose등이 들어 있으나 밤차에는 glucose, galactose, mannose가 들어 있다. 2. 아미노산은 현미녹차, 밤차, 결명자차 순으로 들어 있다. 3. 카페인은 현미녹차에는 들어 있으나 밤차와 결명자차에는 들어 있지 않았다. 4. 결명자 차는 국소뇌혈류량을 증가시킨 반면 밤차는 감소시켰다. 5. 녹차는 혈압을 증가시켰다. 6. 밤차는 in vitro상에서 흉선세포와 비장세포의 증식을 유의성있게 증가시켰다. 7. 결명자차와 녹차는 in vitro상에서 흉선세포의 증식을 감소시켰다. 8. 결명자차와 녹차는 L1210세포가 이식된 동물의 흉선세포 증식을 감소시켰다. 9. 밤차는 L1210세포가 이식된 동물의 비장세포 증식을 촉진시켰다. 10. 밤차와 결명자차는 L1210세포가 이식된 동물의 암세포 증식을 억제하였다.