• 한국안전학회지
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• 제33권5호
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• pp.28-34
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• 2018

Recently, various engineering approaches have been widely used in the accident investigation field to identify the cause of the accident and to predict damage by accident. Computational analysis is the most commonly used method of accident investigation technique. This technique is mainly used to identify the mechanism of the accident generation and to determine the cause when it is difficult to reproduce the situation at the time of the accident or when it is impossible to perform a reproduction experiment. In this study, The computational fluid dynamics analysis for nitrogen asphyxiation accident generated by defect of building structural between diffusion outlet and cooling tower was performed to determine the inflow path of the suffocation gas, death possibility by concentration of suffocation gas and predicted the time of death due to the accident using 3D modeling and FLACS program. We can quantify diffusion concentration of asphyxiation gas and predict mechanism of death occurrence by accident and evaluate the consequence Analysis through this study. In the future, This method can be widely used in the field of gas safety by improving the reliability and validity of the analysis.

• 대한안전경영과학회지
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• 제18권3호
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• pp.47-54
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• 2016

A confined space means places where the risk of damage to health caused by lack of oxygen or hazardous gases in inadequate ventilation conditions and the risk of fire and explosion caused by flammable substances. Asphyxiation accidents in a confined space occured every year and also occurred more than two people at the same time. In this study, we surveyed the domestic statistical data occurred the lack of oxygen in confined space for the last 10 years(2006-2015) and, analyzed the accident by industries sector, workplace size etc. 17 fatal work accidents that occurred in confined spaces in Korea between 2013 and 2015 were investigated and analyzed using the database of the KOSHA and suggested interventions to minimize asphyxiation accidents in confined spaces. This paper is expected to be used to establish interventions planning and training as a preventive measures in workplace having confined spaces.

• 한국안전학회지
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• 제34권3호
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• pp.21-27
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• 2019

Many accidents have been occurring during welding and flame cutting work related to maintenance and repair as the domestic manufacturing facilities gradually become decrepit. However, it is not easy to find the accurate statistics and analysis data on accidents occurring during welding or flame cutting operations related to maintenance and repair of machinery and equipment. Therefore, in this study, the fatal accident cases of fire/explosion and asphyxiation that occurred during the welding and flame cutting work in the manufacturing industry were collected and their characteristics were analyzed. Then, we tried to find the connection of the accidents according to the machinery/equipment and the work content, and to provide the materials and measures that can be used to prevent the similar accidents. We collected 329 cases of the fatal accidents related to fire/explosion and leakage/contact of chemical substances in the domestic manufacturing industry during the last 10 years (2008 ~ 2017). Among them, 72 accidents occurred during welding or flame cutting were extracted and the related reports were investigated whether they occurred during usual work or unusual work. Also, the machinery/equipment and the work content related to the accidents were classified and analyzed based on the criteria. The analysis results showed that 31 cases of the fire/explosion accidents occurred during usual work and 32 cases during unusual work, and it was found that 9 cases of asphyxiation death occurred during usual work. Then, from the analysis results, the connections of the machinery/equipment and the work contents related to the accidents were schematized into a accident tree.

• 한국가스학회지
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• 제24권2호
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• pp.36-43
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• 2020

가스계 소화설비는 경제적으로 매우 유용한 설비이지만 설비를 갖춘 후 장기간 미사용될 경우 용기부식으로 인한 파열 현상과 설비 시스템 작동 오류 등이 나타날 가능성이 있어 큰 위험성을 내재하고 있다. 하지만 소화설비 특성 상, 설비의 정상작동 여부를 확인하기 위한 실험이 불가하여 파열 및 오작동으로 인해 밀폐공간 내에 가스가 일시적으로 방출되면 가스질식으로 인한 큰 인명 피해를 가져올 수 있다. 본 연구에서는 최근 발생한 가스계 소화설비작동 오류로 인한 질식 사망 사고를 바탕으로 사고 메커니즘을 분석하기 위해 실제사고가 발생한 현장에 대해 3D 스캐너와 FLACS를 활용하여 설비 오류로 인한 이산화탄소 가스의 유입경로와 이로 인한 사망 가능성 및 사망에 이르는 시간 등을 추정하였으며 이를 통해 질식사고로 인한 정확한 피해 영향을 평가하고자 한다.

• 대한조선학회논문집
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• 제54권4호
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• pp.294-300
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• 2017

The offshore installations and ships are the structures most likely to be exposed to hazards such as hydrocarbon fire and/or explosion. Developing proactive measures to prevent the escalation of such events thus requires detailed knowledge of the related phenomena and their consequences. $CO_2$ extinguishing systems are extensively used for fire accidents of on-and offshore installations because of outstanding performance and low cost. There is, however, the risk of carbon dioxide system which enumerates many of the fatalities by suffocation associated with industrial fire protection requirements. Therefore, the aim of this study is to perform the prediction of fire suppression characteristics of the carbon dioxide system in realistic enclosed compartment area of ships and propose $CO_2$ extinguish fire fighting system for preventing suffocation accidents during fire fighting. According to CFD calculations, it can be observed and assessed that various fire profiles with $CO_2$ and $O_2$ mole fraction in the target enclosed compartment area are applicable within the proposed system. Additionally, the design of fire safety system of ships and offshore installations can utilize ventilation system and/or layout arrangement through the proposed system.

• 한국화재소방학회논문지
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• 제29권6호
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• pp.57-64
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• 2015

육상 및 해상에서 일어나는 화재를 진압하기 위한 가스계 소화설비 중 이산화탄소 소화설비는 우수한 성능 및 높은 경제성으로 인하여 널리 사용되고 있지만, 고농도 이산화탄소로 인한 질식사고가 빈번히 발생하여 안전문제가 항상 지적되어 왔다. 본 연구에서는 수치해석을 통하여 선박 내 압축기실의 이산화탄소 소화설비 화재 진압 특성을 예측하고, 이산화탄소 소화설비로 인한 질식사고를 방지하기 위한 2중 안전 제어기법을 제시하여, 이산화탄소 소화설비의 안전을 도모하였다. 수치해석 결과로는 4가지 시나리오를 선정하여, 화재발생 후 이산화탄소 소화설비 작동으로 인한 열발생률 변화, 온도변화, 이산화탄소 농도변화, 산소 농도변화 및 화재진압 특성을 고찰하였으며, 방호구역 내 환기팬 용량이 충분하지 않은 경우의 위험성 및 적절한 환기시스템의 필요성을 제시하였다.