Journal of Korean Institute of Industrial Engineers (대한산업공학회지)

Korean Institute of Industrial Engineers (대한산업공학회)
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M/G/1 Queueing Model for the Performance Estimation of AS/RS

자동창고시스템의 성능평가를 위한 M/G/1 대기모형

  • Lim, Si-Yeong (Department of Industrial Engineering, Hanyang University) ;
  • Hur, Sun (Department of Industrial Engineering, Hanyang University) ;
  • Lee, Moon-Hwan (Department of Industrial Engineering, Hanyang University) ;
  • Lee, Young-Hae (Department of Industrial Engineering, Hanyang University)
  • 임시영 (한양대학교 산업공학과) ;
  • 허선 (한양대학교 산업공학과) ;
  • 이문환 (한양대학교 산업공학과) ;
  • 이영해 (한양대학교 산업공학과)
  • Received : 20000400
  • Accepted : 20010100
  • Published : 2001.03.31
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Abstract

Most of the techniques for the performance estimation of unit-load AS/RS are a static model or computer simulation. Especially, their models have been developed under the assumption that the Storage/Retrieval (S/R) machine performs either single command(SC) or dual command(DC) only. In reality, depending on the operating policy and the status of the system at a particular time, the S/R machine performs a SC or a DC, or becomes idle. In order to resolve this weak point, we propose a stochastic model for the performance estimation of unit-load ASIRS by using a M/G/1 queueing model with a single server and two queues. Server utilization, expected numbers of waiting storage and retrieval commands and mean time spent in queue and system are found.

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