Industrial Engineering and Management Systems

Korean Institute of Industrial Engineers (대한산업공학회)
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A Roots Method in GI/PH/1 Queueing Model and Its Application

  • Choi, Kyung Hwan (Department of Military Operations Research, Korea National Defense University) ;
  • Yoon, Bong Kyoo (Department of Military Operations Research, Korea National Defense University)
  • Received : 2013.05.20
  • Accepted : 2013.08.13
  • Published : 2013.09.30
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Abstract

In this paper, we introduce a roots method that uses the roots inside the unit circle of the associated characteristics equation to evaluate the steady-state system-length distribution at three epochs (pre-arrival, arbitrary, and post-departure) and sojourn-time distribution in GI/PH/1 queueing model. It is very important for an air base to inspect airplane oil because low-quality oil leads to drop or breakdown of an airplane. Since airplane oil inspection is composed of several inspection steps, it sometimes causes train congestion and delay of inventory replenishments. We analyzed interarrival time and inspection (service) time of oil supply from the actual data which is given from one of the ROKAF's (Republic of Korea Air Force) bases. We found that interarrival time of oil follows a normal distribution with a small deviation, and the service time follows phase-type distribution, which was first introduced by Neuts to deal with the shortfalls of exponential distributions. Finally, we applied the GI/PH/1 queueing model to the oil train congestion problem and analyzed the distributions of the number of customers (oil trains) in the queue and their mean sojourn-time using the roots method suggested by Chaudhry for the model GI/C-MSP/1.

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References

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