구조물의 최적안전지수와 생애주기비용의 상관관계에 관한 연구

방명석 ( Myung Seok Bang ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.6

본 연구는 구조물의 최적안전수준과 수명기간동안 투자되는 총비용과의 상관관계를 연구하였다. 설계, 건설 및 공용 중 투자되는 총비용을 최소화하면서 최적의 안전수준을 결정하기 위하여 신뢰성해석을 수행하였다. 신뢰성해석에는 설계인자들의 불확실성과 설계 및 공사, 유지관리를 수행하는 인간의 오류 등 인적 불확실성을 확률변수로 고려하였다. 이러한 확률해석을 통한 안전지수와 생애주기비용의 상관관계를 연구하고, 생애주기비용의 분산도에 따른 안전지수의 민감도해석을 통하여 최적의 안전수준을 결정하였다. 해석결과는 이러한 평가방법이 교통시설물에 투자되는 비용을 최소화하면서 최적의 안전수준을 결정할 수 있는 정확하고 유용한 방법임을 보여주었다. This study was intend to develop the optimal design method of suspension bridge by the reliability analysis based on minimization of life cycle cost(LCC). The reliability analysis was performed considering aleatory uncertainties included in the result of numerical analysis. The optimal design was estimated based on life-cycle cost analysis depending on the result of reliability analysis. As the effect of epistemic uncertainty, the safety index (beta), failure probability (pf) and minimum life cycle cost were random variables. The high-level distributions were generated, from which the critical percentile values were obtained for a conservative bridge design through sensitivity assessment.

산업안전관리의 개선방안에 관한 연구

조주현 한국산업안전학회 1986 한국안전학회지 Vol.1 No.1

생산위주의 개발도상국 진입으로 산업재해가 크게 증가하는 추세에 있음은 중대한 문제로 되고있다. 산업안전관리는 기술적으로 잘하면 최대 98%까지 예방가능한 분야이다. 안전사고의 원인을 이적 근로자적 측면에서 경영자적 측면에서 분석하고 이를 조화 또는 통제하는 요인으로 관리적, 행정적 요인을 분석하였다. 개선방안은 산업의 고도화, 다양화에 따른 신기술부족, 안전지식 및 교육부족, 그리고 중소기업의 산업안전 보건시설 개선의 미홉등, 이들 직접 원인에 대한 통제 및 조화 수단으로서 법체제, 행정조직을 강화하고 산업안전관리를 민간주도로 추진해나갈 연구 및 예방기관의 육성이 되어야 한다.

자동차부품 제조업 근로자의 작업능력과 직무스트레스에 대한 연구

목연수 ( Yun Soo Mok ),이동원 ( Dong Won Lee ),장성록 ( Seong Rok Chang ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3

According to the Statistics Korea, in 2011, people over the age of 65years old accounted for 11.8%of Korea′s population. This number is expected to rise to 15.0% by 2019, making Korea an “aged society”. As age increases, physical ability degrades to the point that the workload musk be adjusted limitations. However, workloads are given regardless of workers′ ages or abilities. In addition, a decline in work efficiency due to aging also increases the risk of work-related injuries. Furthermore, the cases of stress related diseases along with musculoskeletal disorders (MSDs) rise as main factors of industrial disasters and excessive job stress gives negative influence not only on mental health but also on physical health so that job stress becomes a hot issue as a main cause of work ability falloff and turnover. The purpose of this research is to examine how the sociodemographic characteristics, MSDs symptoms and musculoskeletal workload of workers in the manufacturing industry of automobile parts influence work ability and job stress. As a result of the research, job ability showed significant differences statistically according to age, working year, sex, marital status and musculoskeletal workload and job stress showed significant differences statistically according to age, working year, marital status and musculoskeletal workload. In addition, it showed that as the worker′s job ability decreases, job stress increases.

원자력발전소 건설공사의 공종별 위험도에 관한 연구

이종빈 ( Jong Bin Lee ),이준경 ( Jun Kyung Lee ),장성록 ( Seong Rok Chang ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3

The goal of this study was to investigate some significant factors to influence level of safety at plant construction field and analyze degree of risk by work classification. Currently, there are lots of construction fields for the nuclear power plant for electricity generation, and our government also planned constructing more nuclear power plant in near future. However, much of the safety literature neglected the degree of risk factors on the plant construction field. Safety managers participated in the brainstorming session for drawing decision criteria of the degree of risk (i.e., significant factors). Then, they were asked to answer a structured questionnaire which was developed for drawing most important factors. Finally, the analytic hierarchy process (AHP) was used to analyze level of risk by work classification. The following results were obtained. First, total twelve factors judging degree of risk were found in the brainstorming session. Second, the questionnaire showed four significant factors, including number of workers, working environments, skill of brainstorming session. Second, the questionnaire showed four significant factors, including number of workers, working environments, skill of craft and accident experience. Third, the results of AHP showed Architecture work is the most dangerous work among 6 work types. The results could be used to reduce degree of risk in construction field of the nuclear power plant.

차량 화재 위치를 고려한 콘크리트 교량의 손상 영향 평가

박장호 ( Jang Ho Park ),김성수 ( Sung Soo Kim ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3

Heat transfer analysis and thermal stress analysis for the concrete bridge was performed in order to investigate the damage of the concrete bridge by the fire of the vehicle. Changes in material properties, such as thermal conductivity, specific heat, density, elasticity, caused by temperature rise were considered. Heat transfer analysis and thermal stress analysis were performed according to the various location of the fire by ABAQUS. From the comparison of the numerical results, the degree of structural damage for the concrete bridge was investigated and considerations for the design of a concrete bridge against fire were identified.

BDG 농도변환에 따른 용수의 목분 침투특성 연구

공일천 ( Il-chean Kong ),박일규 ( Il Gyu Park ),임경범 ( Kyung Bum Lim ),이동호 ( Dong Ho Rie ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3

As the feature of fire, it is hard for deep-seated fire to spread to the deeper site, and it also has danger for being re-ignited cause of recontacting with oxygen after being put off. Now it is ruled in the certification criteria of wetting agent used for extinguishing deep-seated fire that the criteria for surface tension is below 33[mN/m] in Korea. For figuring out how much water for fire-fighiting can permeate into combustibles, in this research, the permeating performance is analyzed by measuring the speed of permeating and transmission quantity released after that, by pouring solution whose surface tension is changed by adjusting concentration of surfactant BDG (Butyl Di Glycol) in column From this result, it is can be determined that transmission quantity becomes less and wet area goes wider as surface tension is lower, and it is also able to be analyzed as quantity of absorbed liquid and wet area is increased because fluid permeates into the core.

4M 및 HAZOP 기법을 활용한 연구실 위험요소 분석 연구

김태훈 ( T H Kim ),이광원 ( K W Rhie ),서두현 ( D H Seo ),이익모 ( I M Lee ),윤충식 ( C S Yoon ),이윤근 ( Y K Lee ),박정임 ( J I Park ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3

In university laboratories, areas of studies are becoming diverse and complicated according to the development of the industry. New forms of potential risk factors are increasing and they are unlike existing ones. In addition, many students are conducting various experiments in the laboratory. Therefore, they could be exposed to risk more often. Despite these risks, people do not recognize university lab safety activities properly and observe safety precautions. They are exposed to various laboratory accidents continually. In this study, we do not apply the present diagnosis method, checklist, but the safety assessment that is widely used in industry. Then we can find lots of hazard that checklist method could miss. This study will use the 4M and Hazard & Operability to design a new Laboratory safety assessments method.

조종장치-표시장치 스테레오타이프 조사를 위한 설문조사법의 정확성 -4구 가스렌지 조종장치-버너 연결에 대한 스테레오타이프를 중심으로-

기도형 ( Do Hyung Kee ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3

The purpose of this study is to empirically investigate accuracy of paper-pencil test used in surveying control-display stereotype. For doing this, three paper-pencil tests dealing with stereotype for control-burner relationship of four-stove gas range, in which three different gas range images were provided, were performed and the results were compared with those of existing studies. The result of the paper-pencil test using simple image composed of line and circle was different from that of the real model simulation. Furthermore, the proportion of responses coinciding with the real model simulation increased as images used became closer to real range. It is concluded that the paper-pencil test well designed using realistic images ma produce the same stereotype as the real model simulation.

인공지능 피난유도설비 적용에 따른 최적 대피시뮬레이션 연구

장재순 ( Jae Soon Jang ),공일천 ( Il-chean Kong ),이동호 ( Dong Ho Rie ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3

For safe evacuation in the fire disaster, the evacuees must find the exit and evacuate quickly. Especially, if the evacuees don′t know the location of the exit, they have to depend on the evacuation guidance system. Because the more smoke spread, the less visibility is decreasing, it is difficult to find the way to the exit by the naked eye. For theses reasons, the evacuation guidance system is highly important. However, the evacuation guidance system without change of direction has the risk introduce to dangerous area. In the evacuation safety assessment scenario by the evacuation simulation has the same problem. Because the evacuee in the simulation evacuate by the shortest route to the exit, the simulation result is same like the evacuation without the evacuation guidance system. In this study, it was used with MAS (Multi Agent System)-based simulation program including the evacuation evacuation guidance system to implement the change of evacuation by fire. Using this method, confidence of evacuation safety assessment can be increase.

노심손상빈도 평가를 위한 APR+PAFS의 안전 해석

강상희 ( Sang Hee Kang ),문호림 ( Ho Rim Moon ),박영섭 ( Young Seop Park ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3

The Advanced Power Reactor Plus (APR+), which is a GEN III+ reactor based on the APR1400, is being developed in Korea. In order to enhance the safety of the APR+, a passive auxiliary feedwater system (PAFS) has been adopted in the APR+. The PAFS replaces the con-ventional active auxiliary feedwater system (AFWS) by introducing a natural driving force mechanism while maintaining the system function of cooling the primary side and removing the decay heat. As the PAFS completely replaces the conventional AFWS, it is required to verify the cooling capacity of PAFS for the core damage frequency (CDF) evaluation. For this reason, this paper discusses the cooling performance of the PAFS during transient accidents. The test case and scenarios were picked from the result of the sensitivity analysis in APR+ Probabilistic Safety Assessment (PSA). The analysis was performed by the best estimate thermal-hydraulic code, RELAP5/.MOD3.3. This study shows that the plant maintains the stable state without the core damages under the given test scenarios. The results of PSA considering this analysis′ results shows that the CDF values are decreased. The analysis results can be used for more realistic and accurate performance of a PSA.