• 제목/요약/키워드: 허용된 위험

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Determination Method of Target Residual Risk for Proper Information Security Level Determination (조직의 적정 정보 보안 수준 결정을 위한 목표 잉여 위험의 결정 방법)

  • 김정덕;이성일
    • Proceedings of the Korea Database Society Conference
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    • 1999.10a
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    • pp.129-139
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    • 1999
  • 현재의 조직 환경에서 정보 보호 수준의 결정은 필수 불가결한 이슈가 되고 있지만 정보 보호 수준 구축을 위한 기준은 상대적으로 부족한 실정이다. 이에 본 논문에서는 정보 보호 수준 결정에 있어서 기준이 될 수 있는 중요한 요소인 위험에 대해서 기존의 위험 평가 프로세스를 분석하여 개선된 위험평가 프로세스를 제시하고 허용 가능한 위험을 결정하기 위한 중요 기준인 목표 잉여 위험의 결정 방법에 대해 논하고자 한다.

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Ship Collision Risk Assessment for Bridges (교량의 선박충돌위험도 평가)

  • Lee, Seong Lo;Bae, Yong Gwi
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.1A
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    • pp.1-9
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    • 2006
  • An analysis of the annual frequency of collapse(AF) is performed for each bridge pier exposed to ship collision. From this analysis, the impact lateral resistance can be determined for each pier. The bridge pier impact resistance is selected using a probability-based analysis procedure in which the predicted annual frequency of bridge collapse, AF, from the ship collision risk assessment is compared to an acceptance criterion. The analysis procedure is an iterative process in which a trial impact resistance is selected for a bridge component and a computed AF is compared to the acceptance criterion, and revisions to the analysis variables are made as necessary to achieve compliance. The distribution of the AF acceptance criterion among the exposed piers is generally based on the designer's judgment. In this study, the acceptance criterion is allocated to each pier using allocation weights based on the previous predictions. To determine the design impact lateral resistance of bridge components such pylon and pier, the numerical analysis is performed iteratively with the analysis variable of impact resistance ratio of pylon to pier. The design impact lateral resistance can vary greatly among the components of the same bridge, depending upon the waterway geometry, available water depth, bridge geometry, and vessel traffic characteristics. More researches on the allocation model of AF and the determination of impact resistance are required.

Case Study on Risk Assessment of Railway Infrastructure Sections Using Acceptable Risk Matrix (위험도 매트릭스를 활용한 철도시설물 구간 위험도평가의 사례연구)

  • Shin, Duck-ho;Park, Chan-woo;Chae, Eunkyung;Lee, June-Seok
    • Journal of the Korean Society for Railway
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    • v.20 no.4
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    • pp.550-557
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    • 2017
  • Owing to the established international standards for reliability and safety management of railways and the third-part conformity assessment implementation, quantitative risk assessment focusing on communication system related to railway safety has being implemented. The quantitative risk assessment starts from the establishment of quantitative RAMS requirements; the risk has to be maintained under an acceptable safety level. This paper introduces the risk assessment process based on international standards ; risk assessment was conducted using failure data for railway facilities for about 5.5 years. In addition, based on the results, a scientific risk management method for railway facilities is suggested.

A Study on the Quantitative Risk Assessment of Hydrogen-CNG Complex Refueling Station (수소-CNG 복합충전소 정량적 위험성평가에 관한 연구)

  • Kang, Seung-Kyu;Huh, Yun-Sil
    • Journal of the Korean Institute of Gas
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    • v.24 no.1
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    • pp.41-48
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    • 2020
  • This study performed a quantitative risk assessment for hydrogen-CNG complex refueling stations. Individual and societal risks were calculated by deriving accident scenarios that could occur at hydrogen and CNG refueling stations and by considering the frequency of accidents occurring for each scenario. As a result of the risk assessment, societal risk levels were within the acceptable range. However, individual risk has occurred outside the allowable range in some areas. To identify and manage risk components, high risk components were discovered through risk contribution analysis. High risks at the hydrogen-CNG complex refueling station were large leakage from CNG storage containers, compressors, and control panels. The sum of these risks contributed to approximately 88% of the overall risk of the fueling station. Therefore, periodic and intensive safety management should be performed for these high-risk elements.

Design Vessel Selection of Maritime Bridges using Collision Risk Allocation Model (충돌위험분배모델을 이용한 해상교량의 설계선박 선정)

  • Lee, Seong-Lo;Lee, Byung Hwa;Bae, Yong-Gwi;Shin, Ho-Sang
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.3
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    • pp.123-134
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    • 2006
  • In this study ship collision risk analysis is performed to determine the design vessel for collision impact analysis of the maritime bridge. Method II which is a probability based analysis procedure is used to select the design vessel for collision impact from the risk analysis results. The analysis procedure, an iterative process in which a computed annual frequency of collapse(AF) is compared to the acceptance criterion, includes allocation method of acceptance criterion of annual frequency of bridge component collapse. The AF allocation by weights seems to be more reasonable than the pylon concentration allocation method because this AF allocation takes the design parameter characteristics quantitatively into consideration although the pylon concentration allocation method brings more economical results when the overestimated design collision strength of piers compared to the strength of pylon is moderately modified. From the assessment of ship collision risk for each bridge pier exposed to ship collision, a representative design vessel for all bridge components is selected. The design vessel size varies much from each other in the same bridge structure depending upon the vessel traffic characteristics.

EPS 공정의 정량적 위험성 평가를 통한 안전의사결정에 관한 연구

  • 정재희;김형석;최광석;이영순
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 1998.05a
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    • pp.141-146
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    • 1998
  • 기업을 경영하는 과정에서 사업주는 여러 가지 경영상의 문제점에 직면하게 되는 데 그 중 안전과 관련된 중요한 문제를 열거하면 다음과 같다. 첫째, 사고발생 가능성의 문제로 "어디서 무엇이 잘못될 수 있으며, 사고의 발생가능성은 얼마나 되는가" 하는 것과 둘째, 사고결과에 미치는 영향의 문제로 "허용할 수 있는 피해규모는 얼마나 되며, 피해가 발생 가능하다면 우리가 부담해야 할 비용은 얼마나 되는가" 하는 것이다. 또한 관리적인 문제로 "위험한 기기는 전체 중 얼마나 되며, 인력 및 자원을 어떤 곳에 집중적으로 투자해야 하는가 또한 이들 위험 설비에 개선이 필요하다면 사용하는 방법이 가장 최적의 방법은 무엇인가"등의 문제를 예로 들 수 있다. (중략)

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Ship Collision Risk of Suspension Bridge and Design Vessel Load (현수교의 선박충돌 위험 및 설계박하중)

  • Lee, Seong Lo;Bae, Yong Gwi
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.1A
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    • pp.11-19
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    • 2006
  • In this study ship collision risk analysis is performed to determine the design vessel for collision impact analysis of suspension bridge. Method II in AASHTO LRFD bridge design specifications which is a more complicated probability based analysis procedure is used to select the design vessel for collision impact. From the assessment of ship collision risk for each bridge pier exposed to ship collision, the design impact lateral strength of bridge pier is determined. The analysis procedure is an iterative process in which a trial impact resistance is selected for a bridge component and a computed annual frequency of collapse(AF) is compared to the acceptance criterion, and revisions to the analysis variables are made as necessary to achieve compliance. The acceptance criterion is allocated to each pier using allocation weights based on the previous predictions. This AF allocation method is compared to the pylon concentration allocation method to obtain safety and economy in results. This method seems to be more reasonable than the pylon concentration allocation method because AF allocation by weights takes the design parameter characteristics quantitatively into consideration although the pylon concentration allocation method brings more economical results when the overestimated design collision strength of piers compared to the strength of pylon is moderately modified. The design vessel for each pier corresponding with the design impact lateral strength obtained from the ship collision risk assessment is then selected. The design impact lateral strength can vary greatly among the components of the same bridge, depending upon the waterway geometry, available water depth, bridge geometry, and vessel traffic characteristics. Therefore more researches on the allocation model of AF and the selection of design vessel are required.