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임대은,채경철 한국경영과학회 2006 한국경영과학회지 Vol.31 No.1
By defining the partial busy period of the queueing system as the time interval during which at least one server is in service, we derive the first two moments of both the partial busy period and the number of customers served during it. All expressions are given in explicit forms
Multi-Load AGV의 생산성 효율 평가를 위한 지표 개발
임대은 ( Dae Eun Lim ),서민석 ( Min Seok Seo ) 한국생산성학회 2011 生産性論集 Vol.25 No.4
The use of Multi-Load AGV (AGV capable of simultaneously transport two Lots with different pick-up and drop-off points) that can significantly enhance operation efficiency of the conventional AGV (Single-Load AGV able to only handle one Lot at a time) is increasing. However, indices for the transportation of Multiple-Load AGV Lot remain unchanged from those for the conventional Single-Load AGV carrying a single Lot, resulting in difficulties to accurately analyze transportation effectiveness of Multiple-Load AGV and troubles to use the indices as a mean to set future direction for additional research. This paper proposes indices to understand transportation and operation effectiveness of Multiple-Load AGV, and based on the new indices, presents a calculation algorithm. Furthermore, it compares the results of the old index calculation method with the new one to analyze the effectiveness of improved algorithm.
A Heuristic Derivation of the Waiting Time Distribution of a GI/G/1 Queue
Dae Eun Lim(임대은),Bokeun Kim(김보근),Nam K. Kim(김남기),Kyung C. Chae(채경철) 한국경영과학회 2015 한국경영과학회지 Vol.40 No.1
This paper presents a heuristic approach to derive the Laplace-Stieltjes transform (LST) and the probability generating function (PGF) of the waiting time distributions of a continuous- and a discrete-time GI/G/1 queue, respectively. This is a new idea to derive the well-known results, the waiting time distribution of GI/G/1 queue, in a different way.
공급이 제한된 상황에서 필수 자원의 형평성을 고려한 분배방법
박종현,임대은 대한산업공학회 2023 대한산업공학회 춘계학술대회논문집 Vol.2023 No.5
• 서울시의 마스크 배분을 사례로 utility와 fairness를 동시에 고려하는 분배 모델 제안 – Utility: 사망률 관점 – Fairness: 구별 utility의 차이값 • SEIR 모델을 적용한 Agent-based simulation을 이용하여 분배 모델의 효용성 검증
Busy period analysis for the n-policy GI/M/c queue
채경철,임대은 한국통계학회 2008 Journal of the Korean Statistical Society Vol.37 No.3
We consider the busy period in the n-policy GI/M/c queue. We present a procedure to obtain the joint transform of the length of a busy period, the number of customers served during the busy period, and the remaining interarrival time at the instant the busy period ends.