• Industrial Engineering and Management Systems
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• v.6 no.1
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• pp.83-93
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• 2007

This paper gives an attempt to build a decision support tool linked with a simulation software called ARENA for evaluating and comparing the performance of the push and pull material driven strategies operating in the flow shop environment with a bottleneck resource as the shop's constraint. To be fair for such evaluation, the comparison must be made fairly under the optimal setting of both systems' operating parameters. In this study, an optimal-seeking heuristic algorithm, Genetic Algorithm (GA), is employed to suggest a systems' best design based on the economic consideration, which is the profit generated from the system. Results from the study have revealed interesting outcomes, letting us know the strength and weakness of the push and pull mechanisms as well as the effect of each operating parameter to the overall system's financial performance.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10b
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• pp.1240-1245
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• 1990

Intelligent Control is an extended paradigm that subsumes both control and AI paradigms, each of which is limited by its own abstractions. Autonomy, as a design goal, offers an arena where both control and AI paradigms must be applied -and a challenge to the viability of both as independent entities. We discuss hierarchical event-based control architectures in which AI and Control paradigms can be integrated within a model-based approach. In a niodel-based system, knowledge is encapsulated in the form of models at the various layers to support the predefined system objectives. Concepts are illustrated with a robotmanaged space-borne chemical laboratory.

• Proceedings of the Korea Society for Simulation Conference
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• 2004.05a
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• pp.141-141
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• 2004

우편물류망은 현재 21개 집중국과 1개의 대전교환센터로 운영되고 있다. 현재 사용하고 있는 우편물류채널은 집중국에서 집중국으로 한차분이상의 물량이 확보되면 직송하고, 나머지 물량은 교환센터에서 집하된 후에 교환하여 발송된다. 그런데 이러한 우편물류채널이 총비용과 서비스 측면에서 우월한 대안인 가에 대한 평가가 필요하다. 따라서 본 연구에서는 우편물류채널에 대한 대안을 집중국과 집중국간의 물량을 모두 직송하는 방법, 집중국에서의 모든 물량을 하나의 교환센터에서 교환하는 방법, 현재의 우편물류채널을 이용한 방법, 수도권 교환센터를 신설하여 교환센터를 2곳을 사용하고 모든 물량을 교환센터를 이용하는 방법, 수도권 교환센터를 신설하여 교환센터를 2곳 사용하면서 각 집중국간 직송을 허용하는 방법 등에 대한 대안 검토를 위한 우편물류채널 최적화를 위한 시뮬레이터의 설계 및 개발을 목적으로 한다. 본 연구에서는 각 대안을 송달기준 만족도와 서비스 처리시간의 평가지표로 평가할 수 있는 우편물류채널 최적화 시뮬레이터를 설계하였으며, ARENA를 이용하여 시뮬레이터를 개발하였다. 또한, 우편물류채널 대안들에 대하여 개발된 시뮬레이터를 이용하여 시나리오 분석을 실시하였다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2000.11a
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• pp.212-216
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• 2000

어떤 특정한 환경과 상황을 가상적으로 모의함으로써 그 환경에 있는 사람이 마치 실제적인 환경 또는 상황과 상호 작용을 하고 있는 것처럼 만들어 주는 진보된 기술을 가상현실(virtual reality) 이라고 한다. 가상현실을 실현하기 위해서는 주변의 영상, 음향, 운동감, 열환경, 후각환경 등이 실제처럼 제시되어야 한다. 본 연구에서는 이중 후각환경의 제시를 위하여 급기 및 배기 위치에 따른 향 농도의 분포를 수치해석적으로 예측한다. 수치해석 결과는 VR 영상관의 향 배기 시스템의 설계 자료로 활용된다.

• Proceedings of the Korea Society for Simulation Conference
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• 1998.03a
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• pp.37-37
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• 1998

현재 정부는 우리나라 물동량 증가에 따른 수도권 항만의 기능 재정립 및 신항만 입지를 선정하기 위한 조사·연구를 진행중이다. 본 연구에서는 현행 인천항의 항만 시스템과 신규항만 시스템에 대한 컴퓨터 시뮬레이션 모형을 개발하여 신항만 개발로 인한 선박대기시간의 감소 및 항만 체류 시간의 감소 등을 예측하였다. 이 결과는 신항만 개발의 경제적 타당성 분석에서 사용자 편익으로 활용될 수 있다. 시뮬레이션 모형은 ARENA를 이용하여 개발하였다. 수도권 항만 즉 인천항에서 처리되는 화물은 양곡을 비롯한 12개 품목이며, 각각의 화물은 5단계의 규모별로 나누어 선박의 도착간격 및 재항시간 분포 등을 1995년 인천항의 실제 자료를 토대로 추정하였다. 선박의 도착간격은 지수 분포로 나타났으며, 서비스시간은 삼각분포(Triangular Distribution)로 근사되었다. 화물량 예측치가 1996, 2001, 2006, 2011, 2020년으로 되어 있고, 이에 따른 신항만 입지 및 규모가 결정됨에 따라 각 연도별로 신항만을 개발할 경우와 개발하지 않은 경우의 각각에 대한 연간 화물별 선박대기 시간 및 재항시간 등을 추정하였다.

• Journal of Korean Institute of Industrial Engineers
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• v.40 no.4
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• pp.428-434
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• 2014

Dry docks are used to repair warships or Merchant ships based on their life cycles. There are the certain number of dry docks in the ROK Navy, However, the ROK Navy force structure has been changing a lot since the Korean War. The focus of this study is to analyze the queueing problem regarding present dry docks capacities and to forecast the appropriate number of dry docks based on future naval ship structure. The study proposes to obtain an efficient dry dock size using queueing problem and simulation.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.36 no.1
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• pp.86-95
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• 2013

The distribution cost increases constantly because of the growth of yield, globalization of accounts and the generalization of e-commerce. This paper is concerned with scheduling on the allocation of workers to maximize the amount of order process in warehouse logistics system. The problem is to determine the number of operators in each process by the sequential time zone. We considered that the number of operators is restricted to the current level and also the process time is changed by putting some resources into the process. In each stage, we suggest some considerations for the allocation of workers and estimate the maximum amount of order process of the alternatives. We analyzed the alternatives using simulation s/w Arena with real cases.

• Journal of the Korea Society for Simulation
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• v.29 no.2
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• pp.11-20
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• 2020

As the manufacturing environment becomes more complex, traditional simulation models alone are having a lot of difficulties in reflecting real-time manufacturing situations. Although the Digital Twin concept is actively discussed as an alternative to overcome theses issues, many studies are being carried out only in the product design phase. This research presents a Digital Twin-based manufacturing environment framework for applying the Digital Twin concept to the manufacturing process. Twin model that is operated in virtual space, physical system and databases describing the actual manufacturing environment, are proposed as detailed components that make up the framework. To check the applicability of proposed framework, a simple Digital Twin-based manufacturing system was simulated in a conveyor system using Arena software and Excel VBA. Experiment results have shown that the twin model is transmitted real time data from the physical system via DB and were operating in the same time unit. The Excel VBA fitted parameters defined by cycle time based on historical data that real-time and training data are being accumulated together. This study proposes operating method of digital twin model through the simple experiment examples. The results lead to the applicability of Digital twin model.

• Journal of Korea Multimedia Society
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• v.23 no.3
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• pp.460-467
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• 2020

The medical service, accompanied by various disease and disease of modern people, must collect various information about patients through various tests, and demand continued to increase. As a result, interest in waiting time for medical services is rising, and various studies are underway to reduce waiting time. However, medical procedure is complex and diverse in the procedure of the services need to be conducted for each procedure. In this study, we are going to propose ways to improve the waiting time of the test procedures that are basically experienced by outpatients through the simulation experimental method. Based on the actual measurement data, the Arena Simulation program was used to implement the hospital's ophthalmic examination model and alternative model. Through this analysis, the waiting time of the examination procedure, the size of the queue, and density of the waiting room were analyzed.

• IE interfaces
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• v.18 no.1
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• pp.35-43
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• 2005

A production system in domestic shoes companies has difficulty in achieving automation and information because of insufficiency of flexibility and standardization. Particularly small and medium sized shoes companies producing by OEM have tendency to chase the given production schedule blindly without considering major factors that may affect the production. Therefore, the production schedules or the process conditions can not be optimally set and are extemporized by the experience in the past. These behaviors cause low productivity and financial loss. To maximize efficiency and productivity of the shoe-making process, we develop a simulation model based on a production system in small and medium sized shoes companies. The model has been developed using ARENA which has been demonstrated to be a powerful tool to simulate various manufacturing systems. Using the simulation model, we find out several problems for the production process, and then suggest several alternatives to improve the system.