Title
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Functional quantitative security risk analysis (QSRA) to assist in protecting critical process infrastructure
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Author
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Abstract
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This article proposes a quantitative security risk assessment methodology that can assist management in the decision-making process where and when to protect critical assets of a chemical facility. An improvement upon previous work is the approach of conducting concurrent Threat and Vulnerability Assessments, as opposed to a sequential approach. Furthermore, this method introduces a Bow Tie risk model mapped into a Bayesian Network model that allows for various logical relaxation assumptions to be applied. Different uncertainty relaxation approaches such as Noisy-OR and Leaky Noisy-OR and Noisy-AND are tested to improve Threat and Vulnerability likelihood. Finally, integrating threat/vulnerability likelihood with potential losses, the security risk is quantified. The potential security countermeasures are characterized into either decreasing vulnerability or decreasing threat likelihood and are reassessed considering a cost analysis. A theoretical case study is conducted to exemplify the execution and application of the proposed method. |
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Language
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English
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Source (journal)
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Reliability engineering and system safety. - Barking
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Publication
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Barking
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2017
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ISSN
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0951-8320
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DOI
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10.1016/J.RESS.2016.08.014
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Volume/pages
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157
(2017)
, p. 23-34
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ISI
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000387195700004
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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