• 한국군사과학기술학회지
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• 제10권2호
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• pp.134-141
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• 2007

The DMSMS(Diminishing Manufacturing Sources and Material Shortage) can occur in every weapon systems and especially, this phenomenon frequently occurs in electronic parts. But we have no DMSMS-related directives, guidelines, regulations and activities, so we have some difficulties in operating weapon systems. In this paper, we review the reality of DMSMS in our weapon systems and then suggest effective alternatives to reduce the risk of DMSMS for weapon systems.

• 산업경영시스템학회지
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• 제11권17호
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• pp.47-54
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• 1988

Korean National Railroad(K.N.R) playing a important role in land transportation gives us many problems to solve considering proper management of National Budget and development of the state of operation by maintaining train parts rationally as public services. According this study is to show inventory provision system for deciding the safety inventory level as the better rational method. Bibliography for this study is limited to only three kinds of seven brakes-shoe which is produced by T workshop in Korean National Railroad. To reduce the holding cost coming from the want of the stock and shortage cost of the stock expected. This study is to present a ratio of shortage on the stock permitted for the last definite period and the demand result forecast per month.

• 국제초고층학회논문집
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• 제13권1호
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• pp.97-102
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• 2024

In this paper, we would like to share our ongoing research on global population and demographic shifts and the corresponding need for diverse responses. As population growth varies worldwide, the pressing issue is the current global housing shortage. The USA alone lacks 4 million homes, underlining the urgency for new construction and renewal of existing. Our focus is primarily on new building processes, which must also incorporate elements of renewal for future sustainability. Our research addresses several key questions: How will roles for construction professionals change? What should be the primary goal of the design process? What types of technologies are currently available, and which aspects of the process can be enhanced with AI? A significant part of our study is exploring sustainable building methods that reduce embodied carbon and increase speed of construction. Our goal is to extend the transition from smart homes to cities, analyzing the evolution towards smart communities and cities. A critical aspect of our research is the 'kit of parts concept, involving prefabrication and modular construction. This approach is essential for both rebuilding and new projects, potentially lowering costs in manufacturing and design for long term. Lastly, we present a detailed comparison of the construction industry with manufacturing.

• 전자통신동향분석
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• 제36권3호
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• pp.1-11
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• 2021

In this study, we analyze the automotive chip ecosystem that recently caused the global supply shortage, and attempt to derive policy implications for us from the conclusion. Automotive chips are critical parts that control various systems so that a vehicle can drive itself or operate with electricity. The current shortage in supply and demand for automotive chips is due to the inconsistency between supply and demand between automotive chip companies and car manufacturers. To promote the automotive chip industry, new investment incentives, tax cuts, and human resource training are needed.

• 한국시뮬레이션학회논문지
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• 제31권3호
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• pp.23-34
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• 2022

철도차량은 제품의 특성상 일정한 수량의 차량이 결합되어 편성이 구성되며, 프로젝트는 복수의 편성을 고객에게 납품하는 것으로 계약이 이뤄지는데 만일 납기를 지키지 못하면 생산자가 지체보상금을 고객에게 지불해야 한다. 이 논문에서는 부품의 결품이 발생하는 상황에서 흐름라인 방식으로 운영되는 철도차량 의장공장의 운영전략에 대해 시뮬레이션을 이용하여 분석한다. 만일 부품의 결품이 발생한다면 조립공정의 특성상 후속 조립공정이 진행될 수 없다. 따라서 이 문제를 해결하기 위해 부품의 결품이 발생했을 때 조립작업을 수행하는 3가지 전략을 제시하였고, 인건비와 지체보상금을 합한 총 비용이 전략에 따라 어떻게 변화되는지 비교하였다.

• 산업경영시스템학회지
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• 제45권4호
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• pp.187-198
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• 2022

This paper addresses the maintenance optimization problem in multi-component systems in which parts are connected in series, carrying out several missions interspersed with scheduled finite breaks. Due to limited time or resources, maintenance actions can be only carried out on a limited set of components. The decision maker then has to decide which components to maintain to ensure a pre-specified performance level during next mission. Most of the existing models in the literature usually assume only one system and enough spare parts. However, there are situations in which maintenance is required for multiple systems of the same type. To overcome this restrictive assumption, this study optimizes the maintenance problem considering the lack of repair parts and cannibalism for many identical systems. This study presents two optimization models with different objectives to solve the problem and analyzes the results so that the decision maker can decide. The results of this study are expected to be used for the maintenance of multiple systems of the same type, such as swarm drones.

• Industrial Engineering and Management Systems
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• 제16권1호
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• pp.52-63
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• 2017

The inventory level of concurrent spare parts (CSP) has a significant impact on the availability of a weapon system. A failure rate function might be of particular importance in deciding the CSP inventory level. We developed a CSP optimization model which provides a compromise between purchase costs and shortage costs on the basis of the Weibull and the exponential failure rate functions, assuming that a failure occurs according to the (non-) homogeneous Poisson process. Computational experiments using the data obtained from the Korean Navy identified that, throughout the initial provisioning period, the optimization model using the exponential failure rate tended to overestimate the optimal CSP level, leading to higher purchase costs than the one using the Weibull failure rate. A Pareto optimality was conducted to find an optimal combination of these two failure rate functions as input parameters to the model, and this provides a practical solution for logistics managers.

• 한국산학기술학회논문지
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• 제14권11호
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• pp.5866-5871
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• 2013

무기체계는 요구되는 수명주기 증가 및 군용 전자부품 시장의 축소 등으로 인해 부품단종이 어쩔 수 없이 발생하게 된다. 그런데, 이러한 부품단종은 무기체계의 운용에 있어서 가장 중요한 전투준비태세와 수명주기비용에 있어 심각한 문제를 발생시킨다. 본 연구에서는 부품단종 발생 원인과 관리 방법을 검토하고, 이러한 부품단종 문제를 최소화하기 위한 방법으로 부품단종 관련 체계적 인프라 구축 및 운영 방안과 부품단종을 고려한 정량적인 성능 개량 시점 판단 및 추진 방안을 제시하였다.

• 상하수도학회지
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• 제27권6호
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• pp.679-687
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• 2013

Although stable and safe drinking water supply to the customers is a basic function of multi-regional water supply systems in Korea, most systems have their vulnerabilities in emergency time due to the branch-type. Application of connections from the other water supply system can provide a solutions for these tentative problems. This paper describes reduction planning of water supply accidents that can minimize a service interruption to customers in multi-regional water supply system by connecting pipe lines between local water supply systems in Mokpo city areas. The result of this study shows that Juam dam multi-regional water supply systems can cover all of the water shortage in southern parts of Jeonnam multi-regional water supply systems by transmitting water through connected pipes between local networks. This can be effective to supply water interactively in various contingencies, when a pipe line accident occurs in southern area of Jeonnam multi-regional water supply systems. On the contrary, southern area of Jeonnam multi-regional water supply systems can cover 99.5 %($62,500m^3/day$) of the water shortage of Juam dam multi-regional water supply systems when service interruptions caused by various pipe accidents occur in the system.

• 한국시스템다이내믹스연구
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• 제6권2호
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• pp.53-71
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• 2005

In the short view, the medical fee regulation has contributed for patients by reducing their hospital expenses and helping them to visit hospital more easily. But, some medical parts have gone into red ink because the medical fee has been different with each item. So, that medical parts have been experienced the medical specialist shortage. And some hospitals have been interested in high-priced medical services to cover their deficit. Moreover, most medical doctors don't need to use low-priced medicine undergo these circumstance, domestic small and medium pharmaceutical company has been going into bankruptcy and the dependence on foreign drug company has been rising. If these abnormal medical service keep to patience, people will get more burden of medical fee cause 9 casual loop work very complicated. In other words, present medical fee regulation were made by some politicians who had plain thinking. Those who govern the people, therefore, stand for not present medical service user but the welfare and health promotion of people and give attention to desirable medical fee with systems thinking.