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백명식 ( Myoung Sig Baek ),장현애 ( Hyeon Ae Jang ),권혁무 ( Hyuck Moo Kwon ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.4
To determine a proper ASIL for each hazardous event with a proper safety goal, the right classes should first be determinedfor the three properties of the hazardous event; (i) severity of harm from the resultant accident, (ii) exposure to the relevant operationalsituation, and (iii) controllability to avoid the induced risks. ASIL can be clearly determined with right classes of these three properties. But no specific methodologies or processes for their classification can be found in ISO 26262, except only a rough guideline with asimplified set of illustrative tables. In this paper, we try to present a systematic model for classifying the three properties of the hazardousevent and suggest a refined procedure of ASIL determination. The proposed model provides a specific method to get a more objectiveASIL compared with that in the standard. Scrutinizing the current methodology, we develop a refined method and also provide anillustrative example.
ASIL에 기초하여 수정된 안전시스템 FMEA 위험평가척도
백명식 ( Myoung Sig Baek ),장현애 ( Hyeon Ae Jang ),권혁무 ( Hyuck Moo Kwon ) 한국품질경영학회 2014 품질경영학회지 Vol.42 No.4
Purpose: The purpose of this study is to suggest a modified approach that compensates some shortcomings of RPN with relevant strength of ASIL for Safety System and suggests systematic and logical approach for FMEA. Methods: By comparing the objectives, determination procedures, and key conceptual differences of RPN and ASIL, a refined method of risk evaluation and a new risk metric are devised. Results: While the traditional FMEA provides only rough evaluation of relative risk for each failure, the proposed method compensates its shortcomings with relevant strength of ASIL and provides a more logical and practical procedure of risk evaluation. Conclusion: The new metric RPM provides not only a comparative priority rank but also the degree of physical seriousness. Besides, it may have even more benefits for various applications if the severity can be expressed as mone tary amount of losses.