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Decision Tree 작성에 의한 화학사고의 통합 해석에 관한 연구
방미진(Mijin Bang),천영우(Youngwoo Chon),황용우(Yongwoo Hwang),이익모(Ikmo Lee) 한국위험물학회 2017 한국위험물학회지 Vol.5 No.1
The chemical accidents has been increased with the use of chemicals, and therefore evaluating the accidents is significant. Current studies on chemical accidents seem to have limits on sort of chemicals, or they seem to have shortage of researches, such as prediction on diffusion of chemicals and extent of damage, after setting up the accident scenarios. In this study, we choose top 10 substances, which caused the chemical accidents frequently, through actual cases that occurred in South Korea at the last 10 years(2006~2015). We use ‘decision trees’ to help people to understand the types of accidents and the damage characteristics of materials easier. In addition, we classified the human damage of 68 cases into three classes, which are small, medium, and large, according to the extent of human damage. We propose the procedure of disaster responses, including contents of "decision trees, on the most frequent accidents, leakage.
물질특성 및 운전조건을 고려한 증기상 물질의 2차 누출에 따른 폭발위험장소 범위 선정에 관한 연구
서민수(Minsu Seo),김기석(Kisug Kim),황용우(Yongwoo Hwang),천영우(Youngwoo Chon) 한국가스학회 2018 한국가스학회지 Vol.22 No.4
현재 KS Code 등 국내규정에서는 폭발위험장소의 범위를 계산하는 방법이 명확하게 나타나지 않아, 정확한 범위 선정을 위해서는 확산 모델링 해석을 이용하여야 한다. 본 연구애서는 대표적인 물질과 운전조건을 활용하여 확산 모델링에 비하여 간편하면서도 비교적 합리적인 폭발위험장소의 범위를 산정하는 방법을 제시하고자 하였다. 현재 시행되고 있는 국내외 표준을 바탕으로 폭발하한계(LFL, Lower Flammable Limit)까지 거리에 영향을 미치는 변수를 선정하였다. 총 16종의 인화성물질을 대상으로 물질변수, 운전변수, 기상조건에 대하여 모델링을 진행하였으며, 통계분석을 통해 영향을 미치는 변수를 선별하였다. 선별된 변수를 이용하여 폭발위험장소의 범위 선정을 위한 3단계 분류화 방법(3Step Classification Method)을 작성하였다. Currently, local regulations, such as KS Code, do not clearly specify how to calculate the range of hazardous area, so the dispersion modeling program should be used to select dispersion. The purpose of this study is to present a methodology of determining the range of hazardous area which is simpler and more reasonable than modelling by using representative materials and process conditions. Based on domestic and overseas regulations that are currently in effect, variables affecting distance to LFL(Lower Flammable Limit) were selected. A total of 16 flammable substances were modelled for substance variables, process conditions variables, and weather conditions variables, and the statistical analysis selected the variables that affect them. Using the selected variables, a three-step classification method was prepared to select the range of locations subject to explosion hazard.
휘발성 유기용제 취급 사업장의 위해성평가 및 위해저감 방안 수립 연구
고광훈(Kwanghoon Ko),김효진(Hyojin Kim),천영우(Youngwoo Chon),황용우(Yongwoo Hwang),이익모(Ikmo Lee),문진영(Jin Young Moon) 한국위험물학회 2019 한국위험물학회지 Vol.7 No.1
Although several studies have reported the detrimental effects of volatile organic solvents, workers of solvent ink manufacturers who are involved in producing them have been producing them in the absence of specific management or regulation due to a lack of cost-effectiveness and risk analysis. With the application of the system of the Chemical management systems, this study selected a total of 5 types of chemicals such as PMAc, CH, BGAc, DMDG and GBL that should be managed. The amount of the emission of air pollutants contained in the selected chemicals. In addition, DNEL of each raw material was calculated with the use of its NOAEL values. Thus, the degree of detrimental effects on humans were evaluated. The result was that the concentration of the emission of BGAc in humans was found to be possibility of the effects of chronic inhalation toxicity. The replacement of a hand pump in the manufacturing process and a canopy hood with a lateral aspiration one were proposed as the essential methods for improving the safety for the reduction.
고광훈(Kwanghoon Ko),서영민(Youngmin Seo),천영우(Yongwoo Hwang),이익모(Ikmo Lee),황용우(Yongwoo Hwang) 한국위험물학회 2020 한국위험물학회지 Vol.8 No.1
Containers usually are used as the general oversea transportation facilities in global. The fumigation materials such as Methyl bromides and formaldehyde, which would be known to be toxic to human or anima beings, commonly are used to remove harmful insect inner containers. Also, workers in unloading container would be easily exposed to toxic materials at working sites and have been reported to occur the safety accidents which would cause many health and damages of workers. In this study, the experimental analysis would be conducted for container unloading workers" exposure risk to hazardous chemical materials based on the international standard, and the kinds and emitted concentrations of hazardous materials would be analyzed and judged occupational exposed risk for electronics products. The results of this study showed that the fumigation materials would be found for all containers. In some containers, it was showed that formaldehyde was found and over occupational exposure limits(OELs) and showed to be found toluene in low level under OELs. But, the inner containers" formaldehyde and toluene detected in tube test would be founded under OELs in precision analysis, and then worker"s exposure risk showed that it could be very lower. In case of products and packing materials, the concentration of formaldehyde and VOCs(Bezene, Toluene) could be under OELs, and then the worker"s exposure risk showed it could be lower. In the future, it should be set up management procedure to prevent worker in handling containers of domestic, and it will be applicable to analyze worker exposure risk for another industrial products. except of electronics.
화학소재산업의 증기운 폭발사고 사례분석을 통한 안전성 확보방안 연구
김규환(Kyu-Hwan Kim),이익모(Ikmo Lee),황용우(Yongwoo Hwang),천영우(Youngwoo Chon) 한국위험물학회 2017 한국위험물학회지 Vol.5 No.1
Petrochemical complex has developed rapidly with a high degree of industrialization of chemicals since 1960s. Production and use of chemical increased dramatically. These various damage caused by accidents by fire, explosion and leaks behind the chemicals is constantly increasing. Implementation of PSM from 1996 to get a safety in efforts, but accidents with enormous damage to the environment and human have occurred constantly. The explosion accident of them cause fatal accidents and serveral victims. In this study, the causes of accidents and accident prevention measures were to investigate the incident in accordance with the type of explosive type. Depending on the type of explosive was investigated in the form of increased vapor cloud explosion of a runaway reaction to, and analyzed the differences between domestic and international accident prevention measures. On the other hand, if domestic measures for the cause of the accident was that most, if foreign cases were matched for similar types of analysis come, predicting an accident scenarios were compared to a similar case. In addition, by configuring the accident prevention plans, incident response planning, disaster recovery planning, such as by presenting the safety information for each situation was constructed to ensure the safety of chemicals used in the workplace.