Human Reliability Analysis by Linguistic Expressions : With Consideration of Dependency among Tasks and Task Procedure

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  • OHMORI Akio
    Master's Program in Science and Engineering, University of Tsukuba
  • ONISAWA Takehisa
    Institute of Engineering Mechanics, University of Tsukuba

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  • 言葉による人間の信頼性解析 : 作業間の従属性と作業順序を考慮して
  • コトバ ニ ヨル ニンゲン ノ シンライセイ カイセキ サギョウ カン ノ ジュウゾクセイ ト サギョウ ジュンジョ オ コウリョ シテ

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Abstract

<p>In this paper an analysis model of human reliability is presented, which employs natural language and a fault tree. The meaning of linguistic term about human reliability is expressed by a subjective measure of unreliability defined on subjective unreliability [0, 1], and its AND operation and OR operation in a fault tree analysis are defined. Analysis results are expressed by natural language. In this paper a dependency among human tasks and a task procedure are especially considered as important points in a human reliability analysis. There are two kinds of dependencies among consecutive similar tasks that are failure dependency and success dependency. The latter is peculiar to human reliability. The task procedure is often prescribed in tasks. In this case the error in the task procedure must be considered in the analysis. This is also peculiar to human reliability. Finally, human reliability in tasks considering the dependency and the task procedure is analyzed as an example and analysis results are discussed in order to confirm the validity of the presented analysis model.</p>

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