• Journal of Information Technology Applications and Management
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• 제16권3호
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• pp.59-71
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• 2009

Hazard analysis identifies probability to hazard occurrence and its potential impact on business processes operated in organizations. This paper illustrates a quantitative approach of hazard analysis of information systems by measuring the degree of hazard to information systems using probabilistic risk analysis and activity based costing technique. Specifically the research model projects probability of occurrence by PRA and economic loss by ABC under each identified hazard. To verify the model, each computerized subsystem which is called a business process and hazards occurred on information systems are gathered through one private organization. The loss impact of a hazard occurrence is produced by multiplying probability by the economic loss.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.232-238
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• 2011

Hazard analysis provides the basic foundation for system safety. Hazard analysis is performed to identify hazards, hazard effects, and hazard causal factors. Hazard analysis is used to determine system risk, to determine the significance of hazards, and to establish design measures that will eliminate or mitigate the identified hazards. Hazard analysis is used to systematically examine systems, subsystems, facilities, components, software, personnel, and their interrelationships, with consideration given to logistics, training, maintenance, test, modification, and operational environments. This paper present hazard analysis techniques which is commonly used in railway signalling, comparised their benefits and limitations.

• 한국정보기술학회논문지
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• 제16권11호
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• pp.133-144
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• 2018

철도 시스템의 안전성 표준인 IEC 62278은 위험원 분석을 통해서 철도 시스템이 가질 수 있는 위험원을 예방하거나 또는 제어하도록 요구한다. 만약 위험원 분석이 충분하지 않으면 사고가 발생할 가능성이 높기 때문에, 위험원 분석을 보다 철저히 수행할 필요가 있다. 본 논문에서는 기존의 신뢰성 기반 방법과 시스템 이론적 방법을 상호 결합한 하이브리드 위험원 분석을 제안한다. 제안하는 방법은 기존 위험원 방법을 상호 보완하는 것으로서, 시스템 구성 요소의 고장으로 인한 위험원과 구성 요소들 간의 상호작용으로 인해 발생되는 제어 위험원을 함께 분석한다. 열차간의 속도를 자동 제어하는 다중 적응형 순항 제어 장치의 안전 보호 시스템 개발에 적용한 결과, 기존 방법들 보다 안전 요구사항을 더 많이 추출하여, 위험원으로부터 시스템을 보호함을 확인하였다.

• 인터넷정보학회논문지
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• 제19권6호
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• pp.133-145
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• 2018

의료기기 분야의 시스템들은 사고가 발생할 경우 상해 등의 큰 피해를 줄 수 있으므로 사고가 발생할 수 있는 원인을 찾아 사고를 예방하고 피해를 최소화하는 해저드 분석 활동이 필수적이다. 해저드 분석 활동은 분석 목적에 따라 수행 방법이 다르고 적용할 수 있는 개발 단계가 다르기 때문에 분석 대상 시스템에 적합한 기법을 선택하는 것은 매우 어려운 일이다. 개발 단계 중 개념 단계에서 식별된 해저드를 기반으로 해저드를 완화하거나 예방하기 위한 기본 안전 요구사항이 도출되기 때문에 개념 단계에서 적합한 해저드 기법을 선택하는 것은 매우 중요하다. 본 논문에서는 의료기기 분야 시스템들의 해저드 분석 활동에 적합한 기법을 선택할 수 있도록 개발 단계 중 개념 단계에서 PHA 기법과 STPA 기법을 비교하도록 한다. 이 분석을 통해 의료기기 시스템에서 개념 단계의 적합한 해저드 분석 기법을 선정할 수 있을 것이다.

• 한국안전학회지
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• 제30권3호
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• pp.114-122
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• 2015

In a fire hazard analysis (FHA) for nuclear power plant, various electrical circuit analyses are performed in the parts of fire loading analysis, fire modeling analysis, separation criteria analysis, associated circuit analysis, and multiple spurious operation analysis. Thus, electrical circuit analyses are very important areas so that reliability of the analysis results should be assured. This study is to establish essential electrical elements for each analysis for verification of the reliability of the electrical circuit analyses in the fire hazard analysis for nuclear power plants. Applying the results derived by the study to domestic nuclear power plants, it is expected to determine the adequacy of the fire hazard analysis report and contribute to the reliability of the fire hazard analysis of those plants.

• International Journal of Safety
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• 제9권1호
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• pp.54-57
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• 2010

The LHP uses the capillary head instead of the mechanical pump to transfer the fluid. It does not have any moving parts and transfer the fluid by the capillary head between the vapor and liquid interface of the wick like a heat pipe (HP). Moreover, vapor and liquid flows in the same direction. It can reduce the loss of the pressure in the wick (very short wick in the evaporator) and can transfer large heat over long distance compared with HP. It is necessary that we do the hazard analysis that is a part of the safety design, for the benefit of eliminating and inhibit the hazard. In this paper, we describe the hazard analysis of LHP.

• 대한안전경영과학회지
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• 제19권4호
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• pp.133-140
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• 2017

The Ministry of Science, ICT and Future Planning made law for Pre-Hazard Risk Analysis in December 31, 2014 to protect researchers from continuing accidents in laboratory. Conducted before an experiment, Pre-Hazard Risk Analysis finds hazards of the experiment and rules to manage the hazards.So the Pre-Hazard Risk Analysis can support laboratory safety system by prevent accidents in laboratory. Pre-Hazards Risk Analysis is newly created system so that executors need Guidelines to perform this analysis properly. This study is to develop guide tool for Pre-Hazard Risk Analysis by analyzing other risk assessment systems; PSM, Off-site Consequence Assessment, laboratory safety system. Also, this study suggested how to establish database for Pre-Hazard Risk Assessment by analyse KRAS.

• 환경영향평가
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• 제6권2호
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• pp.113-121
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• 1997

LHR(Landfill Hazard Ranking Model) was developed for assessing the relative hazard of landfills by using the method of value-structured approach. LHR consists of combining a multiattribute decision-making method with a qualitative risk assessment approach. A pairwise comparision method was applied to determine weights of landfill factors related. To prove the validity of weights allocation of landfill hazard evaluation factors, sensitivity analysis was applied. Firstly, the impact on landfill hazard score according to variations of weights of landfill hazard factors was analyzed. Secondly, the impact on landfill hazard score according to conditions change of landfill hazard factors was analyzed. As a result of sensitivity analysis, LHR composite scores are largely influenced by some factors following sequential order such as waste volume, proximity to sensitive environments, containment facilities, distance from drinking water supplies, and waste toxicity. The relative order of landfill hazard evaluated by LHR is not influenced by the weights change of individual factors. Therefore, LHR seems to be a credible model to determine priorities of landfill remediation based on the vulnerability of water resources.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 1997년도 International Symposium on Fire Science and Technology
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• pp.252-259
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• 1997

A method to automate hazard analysis of chemical plants is proposed in this paper. The proposed system is composed of three knowledge bases - unit knowledge base, organizational knowledge base and material knowledge base, and three hazard analysis algorithms - deviation, malfunction and accident analysis algorithm. Hazard analysis inference procedure is developed based on the actual hazard analysis procedures and accident development sequence. The proposed algorithm can perform hazard analysis in two methods and represent all conceivable types of accidents using accident analysis algorithm. In addition, it provides intermediate steps in the accident propagation, and enables the analysis result to give a useful information to hazard assessment. The proposed method is successfully demonstrated by being applied to diammonium phosphate manufacturing process. A system to automate hazard analysis is developed by using the suggested method. The developed system is expected to be useful in finding the propagation path of a fault or the cause of a malfunction as it is capable to approach causes of faults and malfunctions simultaneously.

• 대한안전경영과학회지
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• 제13권4호
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• pp.9-16
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• 2011

Modern systems become more complex and the demand for systems safety goes up sharply. Thus, the proper handling of the safety requirements in the systems design is getting greatly increased attention these days. Hazard analysis has been one of the active areas of research in connection with systems safety. In this paper, we study a subject on how the hazard analysis results can be incorporated in the systems design. To this end we set up a goal on how to systematically generate safety requirements that should reflect hazard analysis results and be implemented in the systems design and development. To do so, we first review the process for systems design and suggest the associated Model. Then the process and results of hazard analysis are analyzed and Modeled particularly with emphasis on the safety data. The resulting data Model incorporating both the hazard analysis and system life cycle is used in the generation of safety requirements. Based on the developed data Model, the generation of the requirements, the construction of requirements DB, and the change management later on is demonstrated through the use of a computer-aided software tool.