In an automotive plant, an automated storage and retrieval system (ASRS) synchronizes material handling flows from a part production line to an auto-assembly line. The part production line transfers parts on small-/large-sized pallets. The products on pallets are temporarily stored on the ASRS, and the ASRS retrieves the products upon request from the auto-assembly line. Each ASRS aisle is equipped with narrow-/wide-width racks for two pallet sizes. An ASRS aisle with narrow-/wide-width racks improves both storage space utilization and crane utilization while requiring delicate ASRS aisle design, i.e., the locations of the narrow-/wide-width racks in an ASRS aisle, and proper operation policies affect the ASRS performance over demand fluctuations. We focus on operation policies involving a common storage zone using wide-width racks for two pallet sizes and a storage-retrieval job-change for a crane based on assembly-line batch size. We model a discrete-event simulation model and conduct extensive experiments to evaluate operation policies. The simulation results address the best ASRS aisle design and suggest the most effective operation policies for the aisle design.

1. 서 론
2. 문헌연구
3. SDTR-ASRS 운영정책 시뮬레이션 평가
    3.1 시뮬레이션 가정사항
    3.2 SDTR-ASRS 운영환경
    3.3 운영정책 및 파라미터
    3.4 시뮬레이션 실험설계 및 성과척도
4. 운영정책 시뮬레이션 실험 및 결과
    4.1 이형 랙 배치 운영정책 분석
    4.2 이형 랙 배치와 공동저장영역 활용률
    4.3 공동저장영역 활용률과 저장-반출 작업전환
    4.4 최적 운영정책 조합
5. 결 론
Acknowledgement
References

• Bosung Kim(Department of Industrial Engineering, Pusan National University) | 김보성 (부산대학교 산업공학과)
• Jeongtae Park(Department of Industrial Engineering, Pusan National University) | 박정태 (부산대학교 산업공학과)
• Soondo Hong(Department of Industrial Engineering, Pusan National University) | 홍순도 (부산대학교 산업공학과) Corresponding Author