• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1999년도 춘계학술대회 논문집
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• pp.105-109
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• 1999

Tool shop of the D Heavy Industries Co.(DHI) fabricates engines for a bus, truck, small ship. In order to increase the production capacity of engines, DHI will be established the new tool shop that consists of a block line, head line, assembly line, test line and AS/RS in 1999. In order to assure the production capacity designed of the new tool shop for producing engines and improve the production process of it, it is needed to find a bottleneck process and an optimal way of allocating workloads among machines and workers to maximize the production. In a way to solve this, we model the engine fabrication process of the tool shop and analyze its performance by computer simulation. In this study, we at first identify the bottleneck processes of the engine fabrication process under the designed operation policy. Then, we derive some alternative operating policies applicable to the new tool shop of an engine, and analyze the optimal operation policy by comparing the performance of the tool shop following each alternative policy.

• 한국국방경영분석학회지
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• 제9권1호
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• pp.69-74
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• 1983

This article presents a deterministic inventory model for situations in which, during the stockout period, a fraction ${\beta}$ of the demand is backordered and the remaining fraction $1-{\beta}$ is lost. By defining a time proportional backorder cost and a fixed penalty cost per unit lost, a convex objective function representing the average annual cost of operating the inventory system is obtained. The optimal operating policy variables are calculated directly. At the extremes ${\beta}\;=\;1$ and ${\beta}\;=\;0$ the model presented reduces to the usual backorders and lost sales case, respectively.

• 한국산업정보학회논문지
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• 제11권2호
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• pp.18-28
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• 2006

최근에 새로운 교수 학습 방법의 하나로 대두되고 있는 e-NIE는 학습자 중심의 흥미와 적성, 창의성 개발, 비판적 사고력의 함양을 통한 문제해결능력과 의사결정 능력을 키워 준다. 본 논문에서는 공업계 고등학교 전기과의 '전기 전자 측정' 과목 중에서 'I. 측정 일반' 단원을 중심으로 보충 심화 학습지를 개발하였으며, 이를 활용한 e-NIE 수업 모형을 설계하고 구현하였다. 본 논문에서 제안한 e-NIE 수업 모형의 효과를 검증하기 위하여 통제 집단에게는 전통적 수업을 실시하고 실험 집단에게는 e-NIE 수업을 실시한 후 결과를 분석하였다. 그 결과 e-NIE 수업을 실시한 학습자들이 학습 동기, 학습 태도, 자기 주도적 탐구력 분야에서 긍정적인 효과가 있는 것으로 확인되었다.

• 한국산업정보학회논문지
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• 제14권1호
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• pp.43-55
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• 2009

본 연구는 뉴미디어 플랫폼이 콘텐츠산업의 창작과 유통에 미치는 영향을 시장상황 분석 및 전문가 진단을 통해 실제적으로 규명 해내는데 목표를 두었다. 콘텐츠산업의 현실진단을 위해서 시장분석과 업계 종사자 및 관련 전문가를 대상으로 한 심층면접 방법을 활용하였다. 진단결과, 다양한 뉴미디어 플랫폼의 상용화가 국내 콘텐츠산업의 창작 활성화 및 유통구조 합리화를 충분히 견인하지 못하고 있는 것으로 나타났다. 국내의 콘텐츠창작 분야는 유통채널의 증가에도 불구하고 새로운 포맷의 다양한 콘텐츠 생산이 활성화되지 못하고 있다. 또한 기존의 인기콘텐츠를 생산하는 소수의 거대 창작업체에 플랫폼 다양화의 혜택이 집중되고 있고, 창작업체의 영세성이 극복되지 못한 가운데 양극화가 심화되고 있는 것으로 분석된다. 콘텐츠유통 분야의 경우 유통되는 콘텐츠는 기존의 인기콘텐츠가 대부분이며, 불공정한 콘텐츠거래관행이 지속되고 있는 것으로 나타났다 이러한 현실적 문제들을 개선하기 위한 혁신적 정책이 요구되는데, 문화콘텐츠산업 생태계가 선순환구소를 형성하도록 조정 역할을 수행해야 한다는 것이다.

• 품질경영학회지
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• 제29권3호
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• pp.39-48
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• 2001

Preventive maintenance(PM) is an action taken on a repairable system while it is still operating, which needs to be carried out in order to keep the system at the desired level of successful operation. In this paper, we consider a Bayesian approach to determine an optimal periodic preventive maintenance policy. When the failure time is Weibull distribution with uncertain parameters, a Bayesian approach is established. Some numerical examples are presented for illustrative purpose.

• 대한산업공학회지
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• 제8권2호
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• pp.33-36
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• 1982

This paper considers preventive maintenance policies for a system with two types of units which is subject to deterioration. Two generalized models are investigated ; a preventive maintenance policy based on the cumulative operating time and a policy based on the number of minimal repairs performed. Optimal preventive maintenance policies which minimize the expected average cost per unit time including the earning loss due to the deterioration are discussed and some numerical examples are given.

• 경영과학
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• 제29권1호
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• pp.1-14
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• 2012

The goal of the multi-reservoir operation planning is to provide an optimal release plan that maximize the reservoir storage and hydropower generation while minimizing the spillages. However, the reservoir operation is difficult due to the uncertainty associated with inflows. In order to consider the uncertain inflows in the reservoir operating problem, we present a Stochastic Dynamic Programming (SDP) model based on the markov decision process (MDP). The objective of the model is to maximize the expected value of the system performance that is the weighted sum of all expected objective values. With the SDP model, multi-reservoir operating rule can be derived, and it also generates the steady state probabilities of reservoir storage and inflow as output. We applied the model to the Geum-river basin in Korea and could generate a multi-reservoir monthly operating plan that can consider the uncertainty of inflow.

• 한국국방경영분석학회지
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• 제23권1호
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• pp.63-75
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• 1997

This study is concerned with a few models for optimal requirement level of CSP by improving and adjusting the existing models to determine CSP items and quantity as follows. First, by building a model with a objective function of the operating level and constrains of budget, quantity and items of CSP are simultaneously determined. Second, we removed some steps to improve initial solution by using a constraint of usable budget level. Third, we demonstrated a model to be applied with real operating situation by combining two models of Lee(1994) and above. Lastly, by assuming a failure probability distribution is a binomial distribution, the better solution can be obtained. Some facts with necessity of policy improvement were raised as follows: (1) necessity of improvement of the CSP acquisition system, (2) in case of the same kind, permission of diversion in order to execute budget effectively, (3) getting accurate failure rate.

• 산업경영시스템학회지
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• 제14권24호
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• pp.7-13
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• 1991

Recently, in FMS composing of various automatic equipments, the machines with lower operating costs, and with higher operating costs and replacement costs resulting from deterioration have been appearing successively as a result of rapidly advances in technology. "Control Limit Policy" [1] by using Markov decision policy, a kind of optimal economic replacement decision, well reflects and represents this environment. In this paper, it is reviewed that the decision method of the forecasted replacement alternatives in planning horizon under technological advances is derived. The proposed method is applied to a numerical example and some characteristics are examined by sensitivity. It is clarified that the method is relatively insensitive to changes of parameters at the present decision. decision.

• 한국산림과학회지
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• 제82권4호
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• pp.396-405
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• 1993

이 논문에서는 비선형계획법(非線型計劃法)에 의해 파티클보드 생산공정을 분석하여 생산비용을 최소화하기 위한 전산(電算)모델을 제시하였다. 의사결정변수(意思決定變數)는 파티클보드의 생산비용 및 품질과 밀접한 관련이 있는 생산공정상의 요소로써 파티클보드의 비중(比重), 접착제 첨가량 및 매트함수율로 설정하였으며, 휨강도 및 박리강도와 같은 파티클보드의 최저 품질기준은 제약조건(制約條件)으로써 이러한 의사결정변수(意思決定變數)들의 비선형함수(非線型函數)로 수식화되었다. 또한 전산(電算)모델을 시나리오에 따른 가상적인 생산여건들에 적용하여 봄으로써, 칩가격, 접착제 가격 및 열압속도와 같은 경영인자(經營因子)들의 변동(變動)이 생산비용에 마치는 영향력을 분석(分析)하여 전산모델의 적용례(適用例)를 제시하였다.