• 산업경영시스템학회지
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• 제23권56호
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• pp.1-8
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• 2000

We present in this paper an optimal stocking policy for a repairable inventory system under reliability improvement. For this purpose we illustrate commercial flight lines with a large number of planes. This model is supported by a central repair facility. For modeling the nonstationary M/M/s system we implemented SIMAN for computing the time dependent number of units in the repair facility with any number of units. In this model we provide the required inventory level at each location. 1y month. for various levels of associated stock-out risk.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.240-241
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• 2019

Construction disasters have more distinctive characteristics than other industrial disasters. Since it is likely that construction disasters will spread to severe accidents, the accident mortality rate is very high compared to the disaster incidence rate. Therefore, the purpose of this study is to compare and analyze the operation status of construction risk assessment by domestic large and medium sized construction companies to prepare improvement direction of risk assessment system. The survey results for safety management experts of construction companies are as follows: Large companies have developed and utilized risk assessment systems in their respective companies, while small and medium construction companies have developed and evaluated risk factors through the Excel program. Rather than performing risk assessment tasks based on historical safety accident data, construction companies have limitations in developing risk factors and preparing solutions with suppliers for each major construction. Therefore, it is necessary to prepare a risk assessment system in the future by analyzing the types of safety accidents, such as the safety accident data of each company as well as the safety accident data.

• 한국군사과학기술학회지
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• 제27권3호
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• pp.364-374
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• 2024

Today, risks created by uncertainty must be managed for successful project execution. From this perspective, applying a risk management process is very important for successful defense systems test works. This paper describes 'the implentation of risk management process for test work' carried out by DTERI's process improvement activities. In this study, the concept of risk management process, and details of the risk management process are examined through PMBOK and ISO/IEC/IEEE 15288, CMMI. After that, we defined 'Standard Process for Risk Management' of defence systems test works. And, we describe 'Risk Management Function' of DTERI's Project Management System(PMS) and the risk management process of DTERI. Finally, the effectiveness of the risk management standard process is verified through quantitative analysis.

• 한국안전학회지
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• 제27권5호
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• pp.224-228
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• 2012

According to the results of Probabilistic Safety Assessment(PSA) for a Nuclear Power Plant(NPP), an Emergency Power Supply(EPS) system has been considered as one of the most important safety system. Especially, the interests in the reliability of the EPS system have been increased after the severe accidents of Fukushima Daiichi. Firstly, we performed the risk assessment and the importance analysis of the EPS system based on the PSA models of the reference plant, which is the Korean standard NPP type. Considering a portable Diesel Generator(DG) system as the reliability reinforcement of the EPS system, we modified the PSA models and performed the risk impact assessment and the importance analysis. Although the reliability of the potable DG could be about 20% of the reliability of the alternative AC DG, we identified that Core Damage Frequency(CDF) was decreased by at least 4.6%. In addition, the risk impacts due to the unavailability of the EPS system on CDF were decreased.

• Journal of Information Processing Systems
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• 제13권5호
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• pp.1358-1371
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• 2017

Dynamic thermal rating (DTR) system is an effective method to improve the capacity of existing overhead line. According to the methodology based on CIGRE (International Council on Large Electric systems) standard, ampacity values under steady-state heating balance can be calculated from ambient environmental conditions. In this study, simulation analysis of relations between parameters and ampacity is described as functional dependence, which can provide an effective basis for the design and research of overhead transmission lines. The simulation of ampacity variation in different rating scales is described in this paper, which are determined from real-time meteorological data and conductor state parameters. To test the performance of DTR in different rating scales, capacity improvement and risk level are presented. And the experimental results show that the capacity of transmission line by using DTR has significant improvement, with low probability of risk. The information of this study has an important reference value to the operation management of power grid.

• 터널과지하공간
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• 제27권6호
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• pp.351-356
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• 2017

본 연구는 발주자 중심의 건설현장 안전관리 방안의 하나로 최근 도입된 설계안전성검토(DfS)의 추진현황을 소개하고 문제점 및 개선방안을 제시한 것이다. 설계안전성 검토는 그동안 시공단계 위주의 시공사 중심의 안전관리에서 발주자 중심의 안전관리체계로 전환하면서 발주자로 하여금 발주자 중심으로 설계단계에서부터 안전을 고려한 설계를 실시토록 하였다. 발주자는 안전을 고려한 설계의 적정성을 검토하고 승인하도록 하였으며, 설계 시 배제하지 못한 위험요소는 시공사로 하여금 시공단계에서 작성하는 안전관리계획 수립 시 위험요소를 제거하도록 계획하고 시공토록 하여 건설현장의 재해를 예방하기 위한 제도이다. 2016년 5월부터 시행된 설계안전성검토 제도를 더욱 발전시켜 현장에서 발생될 수 있는 안전사고 위험요소를 사전에 예방하여 건설공사 사고 저감에 크게 기여할 것이다. 또한 지속적인 위험요소 발굴 및 시스템 개선을 통해 더욱 효율적이고 편리한 제도로 발전시켜가는 방안을 제시하였다.

• 대한조선학회 특별논문집
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• 대한조선학회 2008년도 특별논문집
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• pp.76-83
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• 2008

New and more efficient propulsion systems are required for LNG carriers. One of the proposed systems is a combination of a gas turbine with a heat recovery steam generator. This system constitutes a novel approach, which needs to be analyzed by system analysis and risk assessment to compensate for the lack of field experience. Of specific concern is the high pressure fuel supply system. This paper describes the dispersion and fire analysis performed to identify for safety and design improvement of proposed system.

• 한국항해항만학회지
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• 제42권2호
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• pp.79-86
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• 2018

Common Maritime Data Structure (CMDS) is commonly used by shore and ship users in e-Navigation data domain. In the overarching of e-Navigation architecture, IHO uses S-1XX, a digital exchange standard for next-generation marine information, as data exchange standard. The current CMDS has the advantage of intuitively recognizing the overall structure of e-Navigation. However, it has disadvantage in that it does not allow stakeholders to easily understand benefits that e-Navigation can provide when implementing e-Navigation. In this study, the direction of improving existing system for effective e-Navigation implementation was proposed considering RCOs (Risk Control Options) with expected composition of ship/ shore/ communication system by sector.

• 한국안전학회지
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• 제34권5호
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• pp.159-166
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• 2019

The seismic PSA is to probabilistically estimate the potential damage that a large earthquake will cause to a nuclear power plant. It integrates the probabilistic seismic hazard analysis, seismic fragility analysis, and system analysis and is utilized to identify seismic vulnerability and improve seismic capacity of nuclear power plants. Recently, the seismic risk of domestic multi-unit nuclear power plant sites has been evaluated after the Great East Japan Earthquake and Gyeongju Earthquake in Korea. However, while the currently available methods for system analysis can derive basic required results of seismic PSA, they do not provide the detailed results required for the efficient improvement of seismic capacity. Therefore, for in-depth seismic risk evaluation, improved system analysis method for seismic PSA has become necessary. This study develops a system analysis method that is not only suitable for multi-unit seismic PSA but also provides risk information for the seismic capacity improvements. It will also contribute to the enhancement of the safety of nuclear power plants by identifying the seismic vulnerability using the detailed results of seismic PSA. In addition, this system analysis method can be applied to other external event PSAs, such as fire PSA and tsunami PSA, which require similar analysis.

• 디지털콘텐츠학회 논문지
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• 제19권2호
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• pp.401-405
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• 2018

우리사회가 정보화사회로 급진전됨에 따라 정보통신의 역할이 크게 증대되고 통신시설의 대용량화 집중화로 정보통신사고가 발생할 경우 국민생활에 지대한 영향을 초래할 수 있을 것이다. 따라서, 본 논문에서는 그러한 영향력을 최소화하기 위하여 정보통신사고 위기관리표준매뉴얼의 현황을 알아보고 분석을 통하여 개선방안을 제시하였다. 재난관리주관기관에서는 법령 및 위기관리 표준매뉴얼에 대한 지속적인 연구를 통하여 관리체계, 관련법 체계, 기본계획 및 대응체계, 위기관리 표준매뉴얼 등에 대한 개선이 필요할 것으로 사료된다.