논문 상세보기
pp.167-178
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.
2. 선행연구
3. 지게자 작업할당 규칙
3.1 notation
3.2 기본규칙
3.2.1 Shortest Retrieval Time First(SRTF)
3.2.2 Shortest Travel Time First(STTF)
3.2.3 Longest Waiting Load First(LWLF)
3.3 개선된 작업할당 규칙
3.3.1 가중치를 고려한 평가식 기반 규칙
3.3.2 가중치를 배제한 평가식 기반 규칙
3.3.3 경계값 기반규칙
4. 시뮬레이션 모델
4.1 창고
4.2 화물차량
4.3 지게차
5. 시뮬레이션 분석
5.1 Warm-up 분석
5.2 1차 분석
5.2.1 기준값 설정
5.2.2 개별 집단 분석
5.3 2차 분석
5.3.1 평균차이검정결과를 반영한 결과값
5.3.2 기준집단과의 비교
6. 결론
참고문헌
