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한국안전학회(구 한국산업안전학회)> 한국안전학회지(구 산업안전학회지)> 단순 수명정보를 이용한 IPM의 베이지안 신뢰도 평가 연구

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단순 수명정보를 이용한 IPM의 베이지안 신뢰도 평가 연구

A Study on Bayesian Reliability Evaluation of IPM using Simple Information

조동철 ( Dong Cheol Jo ) , 구정서 ( Jeong Seo Koo )
  • : 한국안전학회
  • : 한국안전학회지(구 산업안전학회지) 36권2호
  • : 연속간행물
  • : 2021년 04월
  • : 32-38(7pages)
한국안전학회지(구 산업안전학회지)

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1. 서 론
2. 본 론
3. 결 론
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This paper suggests an approach to evaluate the reliability of an intelligent power module with information deficiency of prior distribution and the characteristics of censored data through Bayesian statistics. This approach used a prior distribution of Bayesian statistics using the lifetime information provided by the manufacturer and compared and evaluated diffuse prior (vague prior) distributions. To overcome the computational complexity of Bayesian posterior distribution, it was computed with Gibbs sampling in the Monte Carlo simulation method. As a result, the standard deviation of the prior distribution developed using simple information was smaller than that of the posterior distribution calculated with the diffuse prior. In addition, it showed excellent error characteristics on RMSE compared with the Kaplan-Meier method.

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간행물정보

  • : 공학분야  > 기타(공학)
  • : KCI등재
  • :
  • : 격월
  • : 1738-3803
  • : 2383-9953
  • : 학술지
  • : 연속간행물
  • : 1986-2021
  • : 2968


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36권4호(2021년 08월) 수록논문
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1배관 체계 자율 복구 알고리즘 비교, 분석 및 고찰

저자 : 양대원 ( Dae Won Yang ) , 이정훈 ( Jeung-hoon Lee ) , 신윤호 ( Yun-ho Shin )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 1-11 (11 pages)

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Piping systems comprising pumps and valves are essential in the power plant, oil, and defense industry. Their purpose includes a stable supply of the working fluid or ensuring the target system's safe operation. However, piping system accidents due to leakage of toxic substances, explosions, and natural disasters are prevalent In addition, with the limited maintenance personnel, it becomes difficult to detect, isolate, and reconfigure the damage of the piping system and recover the unaffected area. An autonomous recovery piping system can play a vital role under such circumstances. The autonomous recovery algorithms for the piping system can be divided into low-pressure control algorithms, hydraulic resistance control algorithms, and flow inventory control algorithms. All three methods include autonomous opening/closing logic to isolate damaged areas and recovery the unaffected area of piping systems. However, because each algorithm has its strength and weakness, appropriate application considering the overall design, vital components, and operating conditions is crucial. In this regard, preliminary research on algorithm's working principle, its design procedures, and expected damage scenarios should be accomplished. This study examines the characteristics of algorithms, the design procedure, and working logic. Advantages and disadvantages are also analyzed through simulation results for a simplified piping system.

KCI등재

2FTA를 이용한 볼트 유도가열시스템의 고장 및 전기화재 분석

저자 : 김두현 ( Doo-hyun Kim ) , 김성철 ( Sung-chul Kim ) , 엄한얼 ( Haneol Eom ) , 강문수 ( Moon-soo Kang ) , 정천기 ( Cheon-kee Jeong )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 12-19 (8 pages)

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This paper presents a safety assessment method for FTA-based induction heating systems; the failures and causes of electrical fire are first analyzed for each part and module qualitatively, and methods to manage high probabilities of failure and electrical fire are considered, thereby improving the reliability of the induction heating system. The cumulative importance value (ACC) of the minimal cut set is drawn by setting failure as the top event, and STACK and SMPS are observed to account for about 70% of the induction heating system failures. Thus, intensively managing the basic events contained in the minimal cut set of failures for STACK and SMPS is expected to provide effective and stable operation of the induction heating system. When electrical fire is set as the top event, the STACK percentage is 90%. Accordingly, the current IGBT is changed to a FET to increase the applied voltage and prevent induction heating system failure, and a heat sink plane is installed to prevent FET heating caused by switching, thereby preventing an electrical fire. By classifying the parts and modules of the induction heating system in detail and by applying FTA based on actual failure rates and relevant data, more practical and reasonable results may be expected. Hence, continuous research must be conducted to ensure safety when using induction heating systems.

KCI등재

3발전기의 전자기장 분포 특성에 따른 작업자 노출공간 분석

저자 : 성민영 ( Minyoung Seong ) , 김두현 ( Doo-hyun Kim ) , 김승태 ( Seungtae Kim )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 20-28 (9 pages)

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With an increase in the commercialization of electricity, and the development of advanced and large electric devices and various wireless radio wave services, concerns over the effects of electromagnetic fields on human health have increased. Accordingly, the World Health Organization encouraged the development of international standards by establishing the 'International Electromagnetic Fields Project' in 1996 based on studies on the harmful effects of electromagnetic fields on the human body. Moreover, the National Institute of Environmental Health Sciences (NIEHS) classified electromagnetic fields as possible carcinogens under Group 2B category, even though they have been found to have a weak correlation with those effects on human health. Mid-to-large-sized electric facilities used at industrial sites mostly adopt a commercial frequency of 60 ㎐, and workers handling these facilities are exposed to such extremely low frequency (ELF) fields for a long time. A previous study suggested that exposure to ELF electromagnetic fields with frequency ranges from 0 to 300 ㎐, even for a short time, at densities higher than 100 μT may have harmful effects on human body as it affects the activation of nerve cells in the central nervous system by inducing an electric field and current and stimulating muscles and the nervous system in the body. Such studies, however, focused on home appliances used by ordinary people, and research on facilities utilizing high-capacity current and operated by workers at industrial sites is lacking. Therefore, in this study, a 3000 kilowatt generator, which is a high-capacity electric facility employed at industrial sites, was investigated, and the size of the magnetic fields generated during its no-load and high-load operations per distance to produce a map was measured to reveal spots deemed hazardous according to domestic and international exposure standards. The findings of this study is expected to alleviate workers' anxiety about the harmful effects of magnetic fields on their body and to minimize the level of exposure during operations.

KCI등재

4재사용 시스템비계와 시스템동바리 수직재의 허용강도 분석

저자 : 박진석 ( Jin-suk Park ) , 고상섬 ( Sang Seom Ko ) , 원정훈 ( Jeong-hun Won )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 29-36 (8 pages)

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The allowable strength based on experiments and the design allowable strength calculated using the design criteria were compared, which suggested a ratio between the allowable strengths for the reused vertical members of the system scaffolding and system support. By investigating a total of 421 certification reports for reused vertical members, the experimental allowable strengths were collected. Using design criteria such as the road bridge design and KDS 14 30 10, the design allowable strengths were calculated for various slenderness ratios. For the system scaffolding, the average ratio between the experimental and design allowable strengths was calculated to be 0.880 by assuming a normal distribution for all specimens. However, by analyzing the strength ratio according to the slenderness ratio, the lowest average strength ratio was found to be at least 0.844. Therefore, it is reasonable to assume that the allowable strength of the reused vertical members was 80-84% of the design allowable strength. In addition, assuming the allowable strength to be 85% of the design allowable strength is a possible method for reused vertical members of system supports.

KCI등재

5건설기술진흥법과 산업안전보건법 비교분석을 통한 건설업 안전관리 및 계획의 개선방안

저자 : 김시억 ( Si Ouk Kim ) , 윤영근 ( Young Geun Yoon ) , 오태근 ( Tae Keun Oh )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 37-46 (10 pages)

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According to the Korean Statistical Information Service, the number of fatal occupational accidents per 100,000 workers is the highest in Korea, among all the OECD countries. The safety of construction workers is managed by the construction technology promotion act (CTPA) and the occupational safety and health act (OHSA). A review of the current safety management laws is required to improve them for the construction industry, where the numbers of accidents and deaths are constantly increasing. Accordingly, the aim of this study was to identify the problems in unclear business areas through comparison and analysis of the CTPA and OHSA guidelines and establish effective site-dependent construction safety management plans. The overlapping safety and health management terms and tasks of organizations were derived along with identifying the overlapping items of the safety management and hazard and risk prevention plans. Based on these results, several improvements for the design stage, safety cost, and safety education have been suggested in this paper. In addition, an improved model based on the integration and an optimized compromise between these two laws for safety management in areas where many accidents have occurred in recent years has been reported here.

KCI등재

6국가별 건설업 사고사망만인율 산출방식 차이에 대한 비교

저자 : 정재민 ( Jae Min Jeong ) , 이채현 ( Chae Hyun Lee ) , 심유경 ( Yu Kyung Sim ) , 정재욱 ( Jae Wook Jeong ) , 이재현 ( Jae Hyun Lee )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 47-53 (7 pages)

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The fatality rate is used to estimate each country's risk level. However, the fatality rate is calculated using the number of fatal accidents and workers, which is collected differently across countries. It is therefore problematic to use these numbers in an equivalent way. This study proposes a new approach for calculating the number of full-time equivalent workers when evaluating individual countries' fatality rate by suggesting an equivalent condition for the calculation of the number of full-time equivalent workers. This study proceeds in three steps: (i) analysis of the fatality rate among various countries; (ii) fatality rate calculation using the full-time equivalent workers; and (iii) comparison of the fatality rate among various countries. The study found that for the fatality rate based on national data, the fatality rate in South Korea (1.72‱) is 10 times higher than that in United Kingdom (0.17‱). However, according to the number of full-time equivalent workers, the fatality rate in South Korea (1.86‱) was three times higher than that in the United Kingdom (0.56‱). These findings reveal a difference in the fatality rate depending on the method used to calculate the number of full-time equivalent workers. Therefore, the number of full-time equivalent workers must be calculated for each country to accurately compare the fatality rate. Ultimately, the study's results highlight the need for clearer standards in the assessment of the fatality rate by country in international organizations such as the ILO.

KCI등재

7스마트 건설안전기술 도입으로 인한 안전관리자의 역할 스트레스 영향 요인에 관한 연구

저자 : 소한섭 ( Hansub So ) , 설문수 ( Mun-su Seol ) , 맹인영 ( Inyoung Maeng ) , 박교식 ( Kyoshik Park ) , 박종근 ( Jongkeun Park )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 54-61 (8 pages)

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The purpose of this paper is to verify if safety managers must bear stress from additional tasks whenmanaging smart safety technology applications on construction sites. We conducted a survey of 133 safety managers who had experienced managing both safety management and smart safety technology applications at construction sites, and used the SPSS Statistics 25 and AMOS 22 programs to analyze the survey's logicality and the data that we collected. We found that the work burden caused by assuming additional tasks to manage smart safety technology applications affected the stress that safety managers experience when working at construction sites. The stress caused by an increased work burden led construction site safety managers to feel dissatisfied with their jobs. This finding indicates that both on the original job and on additional tasks are entirely mediated. Based on this finding, I suggest that the South Korean government should establish smart safety technology applications, thus reducing the work burden and increasing the job satisfaction for construction site safety managers.

KCI등재

8AcciMap, STAMP, FRAM을 이용한 반응기 세척 작업 중 화재 사고 분석

저자 : 서동현 ( Dong-hyun Seo ) , 배계완 ( Bae Gye Wan ) , 최이락 ( Yi-rac Choi ) , 한우섭 ( Ou-sup Han )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 62-70 (9 pages)

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Representative systematic accident analysis methods proposed so far include AcciMap, STAMP, and FRAM. This study used these three techniques to analyze a fire accident case that occurred during routine manufacturing work in a domestic chemical plant and compared the results. The methods used different approaches to identify the cause of the accident, but they all highlighted similar causal factors. In addition to technical issues, the three accident analysis methods identified factors related to safety education, risk assessment, and the operation of the process safety management system, as well as management philosophy and company culture as problems. The AcciMap and STAMP models play complementary roles because they use hierarchical structures, while FRAM is more effective in analyses centered on human and organizational functions than in technical analyses.

KCI등재

9주택 내 수소연료전지 전용실의 폭발 위험성에 대한 실험적 연구

저자 : 박병직 ( Byoungjik Park ) , 김양균 ( Yangkyun Kim ) , 황인주 ( Inju Hwang )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 71-79 (9 pages)

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In this study, a real-scale fuel-cell room of volume 1.36 m3 is constructed to confirm the explosion characteristics of hydrogen-air mixture gas in a hydrogen-powered house. A volume concentration of 40% is applied in the fuel-cell room as the worst-case scenario to examine the most severe accident possible, and two types of doors (made of plastic sheet and wood) are fabricated to observe their effects on the overpressure and impulse. The peak overpressure and impulse based on distance from the ignition source are experimentally observed and assessed. The maximum and minimum overpressures with a plastic-sheet door are about 20 and 6.7 kPa and those with a wooden door are about 46 and 13 kPa at distances of 1 and 5 m from the ignition source, respectively. The ranges of impulses for distances of 1-5 m from the ignition source are about 82-28 Pa·s with a plastic-sheet door and 101-28 Pa·s with a wooden door. The amount of damage to people, buildings, and property due to the peak overpressure and impulse is presented to determine the safe distance; accordingly, the safe distance to prevent harm to humans is about 5 m based on the 'injuries' class, but the structural damage was not serious.

KCI등재

10산업재해통계기반 Risk 산정에 관한 연구

저자 : 우종권 ( Jong-gwon Woo ) , 이미정 ( Mi-jeong Lee ) , 설문수 ( Mun-su Seol ) , 백종배 ( Jong-bae Baek )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 4호 발행 연도 : 2021 페이지 : pp. 80-87 (8 pages)

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Risk assessment techniques are processes used to evaluate hazardous risk factors in construction sites, facilities, raw materials, machinery, and equipment, and to estimate the size of risk that could lead to injury or disease, and establish countermeasures. The most important thing in assessing risk is calculating the size of the risk. If the size of the risk cannot be calculated objectively and quantitatively, all members who participated in the evaluation would passively engage in establishing and implementing appropriate measures. Therefore, this study focused on predicting accidents that are expected to occur in the future based on past occupational accident statistics, and quantifying the size of the risk in an overview. The technique employed in this study differs from other risk assessment techniques in that the subjective elements of evaluators were excluded as much as possible by utilizing past occupational accident statistics. This study aims to calculate the size of the risk, regardless of evaluators, such as a manager, supervisor, safety manager, or employee. The size of the risk is the combination of the likelihood and severity of an accident. In this study, the likelihood of an accident was evaluated using the theory of Bud Accident Chainability, and the severity of an accident was calculated using the occupational accident statistics over the past five years according to the accident classification by the International Labor Organization.

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1전기기관차 주요부품의 수명주기 설정 및 개선방안에 관한 연구

저자 : 이덕구 ( Doek Koo Lee ) , 이희성 ( Hi Sung Lee )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 1-9 (9 pages)

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2유도가열시스템의 구성부품에 대한 강건설계

저자 : 김두현 ( Doo Hyun Kim ) , 김성철 ( Sung Chul Kim ) , 이종호 ( Jong Ho Lee ) , 강문수 ( Moon Soo Kang ) , 정천기 ( Cheon Kee Jeong )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 10-17 (8 pages)

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This paper presents the robust design of each component used in the development of an induction bolt heating system for dismantling the high-temperature high-pressure casing heating bolts of turbines in power plants. The induction bolt heating system comprises seven assemblies, namely AC breaker, AC filter, inverter, transformer, work coil, cable, and CT/PT. For each of these assemblies, the various failure modes are identified by the failure mode and effects analysis (FMEA) method, and the causes and effects of these failure modes are presented. In addition, the risk priority numbers are deduced for the individual parts. To ensure robust design, the insulated-gate bipolar transistor (IGBT), switched-mode power supply (SMPS), C/T (adjusting current), capacitor, and coupling are selected. The IGBT is changed to a field-effect transistor (FET) to enhance the voltage applied to the induction heating system, and a dual-safety device is added to the SMPS. For C/T (adjusting current), the turns ratio is adjusted to ensure an appropriate amount of induced current. The capacitor is replaced by a product with heat resistance and durability; further, coupling with a water-resistant structure is improved such that the connecting parts are not easily destroyed. The ground connection is chosen for management priority.

KCI등재

3전문건설업 안전문화 평가에 관한 연구

저자 : 신상연 ( Sang-yeon Shin ) , 백신원 ( Sinwon Paik ) , 정성룡 ( Sung-lyoung Jung )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 18-25 (8 pages)

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Specialty contractor facilities, which involve a combination of welding and commissioning, face a high risk of serious accidents such as fire, explosion, and suffocation associated with welding work, nitrogen, and argon use. In such facilities, the organizational safety culture has considerable impact on the frequency of accidents. In this study, a safety culture evaluation was conducted on specialty contractors. NOSACQ-50, a standardized survey method on safety culture, was selected as an assessment tool to evaluate the safety culture in specialized construction companies that could not afford to invest heavily in safety. The self-administered questionnaire survey was conducted with 201 workers of four construction companies and the results were analyzed. It was found that in companies with low safety culture, the occurrence of irrationality was 66.0%, while in companies with high safety culture, the occurrence of irrationality was 42.6%. Thus, the difference in the occurrence of irrationality by safety culture was statistically significant. The difference in safety culture level according to the experience of occurrence of irrationality was also significant. It was also found that the higher the belief in safety management authorization, safety responsibilities of managers, worker safety priorities, and safety system effects, the lower the probability of irrationality.

KCI등재

4커튼월 고층 건물 빛 반사에 의한 운전자 눈부심 가능성

저자 : 송형준 ( Hyung-jun Song ) , 서영교 ( Young Kyo Seo )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 26-31 (6 pages)

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Buildings with glass curtain walls have become popular due to their appealing aesthetics and ability to let in natural light. However, light reflection from the glass surface is unavoidable in these buildings. In particular, the reflection of light from the glass envelope can create afterimage glare, a hazard to nearby drivers and pedestrians. Despite this potential danger, glare from buildings with curtain walls has not been well-studied. Hence, we analyzed the effect of light reflection on glare around a glass-enclosed skyscraper, depending on its surface reflectance. We investigated the potential hazard of glare to drivers using a commercially available software program. The results indicate that the direction of light reflection is distinctive when the incident angle of solar light increases. Moreover, this light reflection is high enough to induce an afterimage to drivers and pedestrians near the building. We found that keeping the reflectance of the building surface under 3% is required to minimize the afterimage hazard to drivers. Consequently, we recommend managing glass reflectance and installing additional traffic safety systems to reduce traffic accidents near curtain wall buildings.

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5단순 수명정보를 이용한 IPM의 베이지안 신뢰도 평가 연구

저자 : 조동철 ( Dong Cheol Jo ) , 구정서 ( Jeong Seo Koo )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 32-38 (7 pages)

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This paper suggests an approach to evaluate the reliability of an intelligent power module with information deficiency of prior distribution and the characteristics of censored data through Bayesian statistics. This approach used a prior distribution of Bayesian statistics using the lifetime information provided by the manufacturer and compared and evaluated diffuse prior (vague prior) distributions. To overcome the computational complexity of Bayesian posterior distribution, it was computed with Gibbs sampling in the Monte Carlo simulation method. As a result, the standard deviation of the prior distribution developed using simple information was smaller than that of the posterior distribution calculated with the diffuse prior. In addition, it showed excellent error characteristics on RMSE compared with the Kaplan-Meier method.

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6전기공사 현장 안전관리자의 직무자원, 직무요구 및 조직몰입의 영향 연구

저자 : 서현정 ( Hyun Jeong Seo ) , 김남균 ( Nam Kyun Kim ) , 손민지 ( Minjie Son ) , 홍아정 ( Ah-jeong Hong )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 39-48 (10 pages)

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This study was conducted to suggest a direction in which safety managers can concentrate on industrial accident prevention and safety management for the organization. The job resources of safety managers were divided into organizational and individual levels, and the magnitude of the impact on organizational commitment was compared. Furthermore, job demands were classified into environmental risk factors and personal psychological factors to confirm their effect on organizational commitment. The moderating effect of job resources and sub-factors of the variable in the relationship between job demands and organizational commitment was verified. In this study, a questionnaire survey was conducted on 193 safety managers in the domestic electric construction business, data were collected, and a questionnaire of 180 people was used for the final analysis. Based on the results, organization-level resources among the sub-factors of job resources and individual psychological factors among the sub-factors of job demand had a more significant influence on organizational commitment. In the relationship between job resources and organizational commitment, the moderating effect of job demand was verified, confirming that job demand had a negative moderating effect. Individual psychological factors had a modulating effect, whereas environmental factors did not. The significance, implications, and limitations of this study are discussed based on the research results.

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7퍼지 기반 다양한 모델을 이용한 회전익 항공기 착륙장치의 위험 우선순위 평가

저자 : 나성현 ( Seong Hyeon Na ) , 이광은 ( Gwang Eun Lee ) , 구정모 ( Jeong Mo Koo )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 49-57 (9 pages)

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In the case of military supplies, any potential failure and causes of failures must be considered. This study is aimed at examining the failure modes of a rotorcraft landing system to identify the priority items. Failure mode and effects analysis (FMEA) is applied to the rotorcraft landing system. In general, the FMEA is used to evaluate the reliability in engineering fields. Three elements, specifically, the severity, occurrence, and detectability are used to evaluate the failure modes. The risk priority number (RPN) can be obtained by multiplying the scores or the risk levels pertaining to severity, occurrence, and detectability. In this study, different weights of the three elements are considered for the RPN assessment to implement the FMEA. Furthermore, the FMEA is implemented using a fuzzy rule base, similarity aggregation model (SAM), and grey theory model (GTM) to perform a comparative analysis. The same input data are used for all models to enable a fair comparison. The FMEA is applied to military supplies by considering methodological issues. In general, the fuzzy theory is based on a hypothesis regarding the likelihood of the conversion of the crisp value to the fuzzy input. Fuzzy FMEA is the basic method to obtain the fuzzy RPN. The three elements of the FMEA are used as five linguistic terms. The membership functions as triangular fuzzy sets are the simplest models defined by the three elements. In addition, a fuzzy set is described using a membership function mapping the elements to the intervals 0 and 1. The fuzzy rule base is designed to identify the failure modes according to the expert knowledge. The IF-THEN criterion of the fuzzy rule base is formulated to convert a fuzzy input into a fuzzy output. The total number of rules is 125 in the fuzzy rule base. The SAM expresses the judgment corresponding to the individual experiences of the experts performing FMEA as weights. Implementing the SAM is of significance when operating fuzzy sets regarding the expert opinion and can confirm the concurrence of expert opinion. The GTM can perform defuzzification to obtain a crisp value from a fuzzy membership function and determine the priorities by considering the degree of relation and the form of a matrix and weights for the severity, occurrence, and detectability. The proposed models prioritize the failure modes of the rotorcraft landing system. The conventional FMEA and fuzzy rule base can set the same priorities. SAM and GTM can set different priorities with objectivity through weight setting.

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8한국 산업계에서 사고조사 수행 시 사고조사자의 관점에 관한 연구

저자 : 권재범 ( Jae Beom Kwon ) , 권영국 ( Young Guk Kwon )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 58-67 (10 pages)

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Incident investigation is regarded as a means to improve safety performance. For the prevention of industrial accidents, measures such as providing safety education, enhancing management interest and participation, establishing a safety management system, and conducting inspection of the work site are necessary. In particular, accident investigation activities, which are an important element of safety management, help to prevent similar accidents, thereby minimizing damage and enhancing work safety. They are critical for understanding business-related incidents and the vulnerabilities and opportunities associated with them. Therefore, it is clear that accident investigation activities are important for accident prevention. The primary focus of many incident investigation processes is on identifying the cause of an event. While considerable research has been conducted on potential accident investigation tools there has been little research on including the views and experiences of practitioners in the accident investigation process. In this study, a questionnaire survey was conducted among safety managers in the domestic manufacturing/construction industry to understand the practice of accident investigation. The investigation pertained to companies' accident investigation systems, the competence of investigators, and the identification and recommendations of the cause of accidents. From the analysis results of accident investigations, investigators' competence, the difficulty level of investigations, and the root causes of accidents were identified from the viewpoint of the participants of the accident investigations. In particular, the development of standardized and simple accident investigation methods and their dissemination to companies were found to be necessary for activating the root cause of accidents. Based on this, it can be used as basic data for the development of root cause analysis investigation techniques that are easily applicable to organizations.

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9국방 안전관리시스템 개선을 위한 주요 외국군 사례분석 연구

저자 : 안재현 ( Jae Hyun An ) , 박찬영 ( Chan Young Park ) , 박상훈 ( Sang Hoon Park ) , 윤홍식 ( Hong Sik Yoon )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 68-79 (12 pages)

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Department of Defense, Republic of Korea has put in significant efforts towards safety over the years by developing defense safety management systems, such as establishing safety management organizations and enacting laws and regulations. Therefore, the number of casualties due to military activities has been reduced dramatically. However, many errors and problems are present in the safety management system (SMS) owing to a lack of proper SMS. That brings inefficiency and discontinuity in SMS. Hence, typical phenomena such as lack of safety management professionals and reactive safety management activities have not been properly corrected. This study reviews various academic papers on the SMS and research reports of major foreign institutions to redefine the concept and components of the defense safety management system to ultimately suggest improvement in the R.O.K defense safety management system. Additionally, the safety management system of the U.S. and British forces, considered to be the leading safety management system, were analyzed and compared to R.O.K defense SMS to derive their implications.

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10개인 및 사고원인 특성이 재난안전인식에 미치는 영향분석

저자 : 오후 ( Hoo Oh ) , 임동균 ( Dong-kyun Yim )

발행기관 : 한국안전학회 간행물 : 한국안전학회지(구 산업안전학회지) 36권 2호 발행 연도 : 2021 페이지 : pp. 80-86 (7 pages)

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The purpose of this study is to diagnose the level of disaster safety perception (disaster safety importance, accident possibility, personal safety, and regional safety) of local residents, and to analyze the impact of individual and accident cause characteristics. The analysis method used multiple regression analysis, and the main analysis results are as follows. First, disaster safety importance and accident possibility were higher as residents who had experience in safety education and were willing to visit the safety experience center in the province. Second, disaster safety importance was higher as the cause of the accident was the lack of response 119 and police. And accident possibility was higher as the cause of the accident was the lack of prior treatment by the state and local governments. Third, personal safety and regional safety were higher for men, and especially personal safety was lower as residents with children. The results of this study can be used as basic data for establishing regional customized disaster safety policies based on the perception of local residents, who are policy consumers.

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