• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2000년도 춘계공동학술대회 논문집
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• pp.253-256
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• 2000

In general, Automated Storage/Retrieval Systems (AS/RS ) have racks of equal sized cells to utilize the concept of unit-load. Most of the techniques for the performance estimation of a unit-load AS/RS are a static model or computer simulation. Especially, their models were developed under assumption that the Storage/Retrieval (S/R) machine performs only single command (SC) or dual command (DC). In reality, defending on the operating policy and the status of the system at a particular time, the S/B machine performs a SC or a DC, or becomes .: idle. In order to resolve these weak points, we propose a stochastic model for the performance estimation of unit-load AS/RS by using a single-server queueing model. Expected numbers of waiting storage and retrieval commands are found

• 기계저널
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• 제34권2호
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• pp.101-111
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• 1994

이 글에서는 무인운반차(AGV: Automated Guided Vehicle), 자동창고 (AS/RS: Automated Storage/Retrieval System), 콘베이어시스템, 바코드시스템 등의 자동물류취급시스템을 응용하여 극단적인 다품종 소량생산체제의 납기단축효과와 가동효율을 어떻게 향상시킬 수 있는지를 저 자들이 직접주도하여 설계 . 설치 . 가동중인 사례를 통하여 실증적으로 밝혀보고자 한다.

• 한국산학기술학회논문지
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• 제11권7호
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• pp.2349-2357
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• 2010

본 논문은 물류 정보시스템과 관련된 자동입출고 시스템의 실행 및 최적화에 관한 것이다. 논문은 우선 문헌연구와 이에 따른 사례연구를 제시하고 있다. 사례연구에서는 기업의 프로세스를 분석한 다음 자동입출고 시스템의 실행 및 활용에 대해 조사하였다. 물류정보시스템은 글로벌 환경에서 경쟁력을 유지하기 위해 주요한 구성요소이며 사례연구에서의 기업은 효율적인 물리적 배분관리에 적용하였다. 자동입출고시스템은 저장공간을 극대화하고 생산성 증가, 정확성을 증가시키는 것으로 판명되고 특히 비좁은 통로와 높은 저장선반의 경우 효과적임을 보여주었다.

• 대한산업공학회지
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• 제14권2호
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• pp.99-114
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• 1988

The objective of this study is mainly related to design aspects of Multi-aisle S/R machine system (MASS) which can substantially reduce high initial investment cost of Automated Storage/Retrieval System. Firstly, the average travel time of the S/R machine is determined under single and dual commands, from which the average performance of S/R machine is evaluated. Secondly, a design model is developed and the system parameters, such as length and height of the system, and the number of S/R machines, traversers and aisles are determined which provide minimum initial investment and operating costs. Also, through experiments, sensitivity analysis is made for the throughput and storage volume.

• 대한안전경영과학회지
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• 제3권3호
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• pp.97-106
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• 2001

This paper considers automated storage and retrieval systems with double shuttle. We developed the expected travel time model based on the first come first served rule. An heuristic procedure by retrieval order sequencing was presented which aimed to improve the operation efficiency laking advantage of ＂No cost zone＂. Through sensitivity study, we evaluated the performance of the double shuttle system working on the four command cycle.

• 한국실천공학교육학회논문지
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• 제4권1호
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• pp.80-85
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• 2012

현대 산업 사회에서 창고의 역할은 보관창고의 개념에서 정보시스템의 도입을 통해 구매, 생산, 저장 및 분배 활동을 원활히 하는 유통창고의 개념으로 바뀌어 창고의 중요성은 계속 커지고 있다. 본 연구에서는 자동창고의 효율성을 평가할 수 있는 프로그램이 C#을 이용하여 개발되었다. 저장법, 자동창고의 배치형태 및 명령수행절차의 세 가지 운영조건의 조합으로 8가지의 방안에 대하여 모의실험이 이루어졌고, 프로그램에 동일한 입출고 데이터를 입력하여 스태커 크레인의 이동거리 값을 산출하였으며, 결과 값을 토대로 원인을 분석하고 최적의 운영방안을 제시할 수 있다. 이 프로그램은 모의실험을 통해 프로그램의 효율성과 응용가능성을 보여주었고, 공장설비 관련 교과목에 활용되어질 수 있다.

• 산업공학
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• 제11권3호
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• pp.23-40
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• 1998

In this paper, a method to determine the optimal configuration of operating policies in an integrated-automated manufacturing system using the Taguchi method and computer simulation experiments is presented. An integrated-automated manufacturing system called direct-input-output manufacturing system(DIOMS) is described. We only consider the operational aspect of the DIOMS. Four operating policies including input sequencing control, dispatching rule for the storage/retrieval(S/R) machine, machine center-based part type selection rule, and storage assignment policy are treated as design factors. The number of machine centers, the number of part types, demand rate, processing time and the rate of each part type, vertical and horizontal speed of the S/R machine, and the size of a local buffer in the machine centers are considered as noise factors in generating various manufacturing system environment. For the performance characteristics, mean flow time and throughput are adopted. A robust design experiment with inner and outer orthogonal arrays are conducted by computer simulation, and an optimal configuration of operating policies is presented which consists of a combination of the level of each design factor. The validity of the optimal configurations is investigated by comparing their signal-to-noise ratios with those obtained with full factorial designs.

• 산업경영시스템학회지
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• 제27권3호
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• pp.26-30
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• 2004

We consider an AS/RS(Automated Storage/ Retrieval System) which performs both of single and dual commands. The service times of single and dual commands are assumed to be differently distributed. Steady-state probabilities at the service completion epochs are calculated. Then, we transform the arrival rates of storage and retrieval commands into those of single and dual commands. Using this, we propose a non-preemptive queueing model with priority for the performance analysis of an AS/RS, and obtain approximated means of queue lengths and waiting times.

• 산업공학
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• 제8권1호
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• pp.45-52
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• 1995

Automated Storage and Retrieval System (AS/RS), which is an element of Computer Integrated Manufacturing (CIM), is a widely used material handling equipment with conveyors and Automatic Guided Vehicles (AGVs). Until now the evaluation of operational policies of AS/RS and control algorithms is done theoretically or by computer simulations. In this study, a real-time control and communication software for an AS/RS is developed for actually moving AS/RS miniature. A PC-based real-time operational program can control the AS/RS directly through the communication port. The operational system has additional functions such as storage/retrieval management, inventory management, statistics management, and protocol simulation. The communication protocol simulator of S/R machine can be used for the controller of an S/R machine.

• 한국시뮬레이션학회논문지
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• 제14권3호
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• pp.43-54
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• 2005

For the effective design of automated distribution center composed of Automated Storage/Retrieval System, Automated Guided Vehicle System, and Conveyor System, we proposed an analysis method to determining. design and control parameters with multiple performance objectives using Compromise Programming, which can resolve the dilemma of conflicting objectives. The Evolution Strategy generates the optimal solutions for each objectives. The Analytic Hierarchy Process selects the best solution among the alternatives generated from Evolution Strategy. The Regression Analysis formulates the objective functions for each objectives. By reducing deviations between goal values and target values generated from Analytic Hierarchy Process, Compromise Programming determines design and control parameters by compromising the multiple objectives formulated using Regression Analysis. When the parameters of system are changed, this proposed analysis method has a benefit of reducing costs and time without repeating whole simulation run.