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This paper presents a human reliability analysis method based on cognitive process model. Human cognitive processes are modelled in different forms under different risk scenarios respectively. The cognitive process model consists of an event tree based on human cognitive process and Bayesian networks modelling the cognitive phases. The Bayesian networks (combining with evidence theory) use hierarchical...
recent study has observed that the high-speed railway industry has failed to prevent the recurrences of accident in the workplaces. Therefore, the Learn from Incidents (LFI) theory is applied to detect the factors that have negative influences on LFI in our study from the perspectives of breadth and depth of learning. Based on the identified negative factors, the HFACS-RAs framework is proposed to...
With the great improvement of operational speed of trains, the on-board ATP of the high-speed railway plays an essential role in train's safe operation as a major component of the signal system. Therefore, it is necessary and important to identify and assess risks in the on-board ATP. In this paper, a quantitative risk assessment method is proposed based on the Bow-tie model. Event trees are exploited...
Through analyzing and summarizing the types of shield tunnel segment failure and the relevant causes of the accident, Fuzzy Fault Tree Analysis (FTA) was employed to study the failure risk of segment and the Fuzzy Fault Tree system model of segment and segment-related systems were established. The potential failure modes of risk accidents and their influencing factors were discussed through qualitative...
Level crossings are defined as passive and automated ones. Traffic risk of the automated level crossing is analyzed and estimated. The function and the dependability of the level crossing control system are modeled based on the stochastic Petri nets. The relationship between the national statistic data and the densities of the road users and railway train is set up and a mathematical function is used...
The applicable CENELEC standards as well as the safety directive of the European parliament expect defining safety requirements for railway control functions and system constituents according to the global safety targets which are to be used for quantification of tolerable risk of the railway operation. This target is achieved by holistic modeling, risk definition and hazard analysis of all the influencing...
This paper focuses on the estimation of traffic risk of passive level railway crossing based on a formal graphic model. Traditional analysis and estimation approaches of traffic risk are based on the aggressive mathematical algorithms. Compared with these traditional methods, formal graphic model has better graphical interface to users, better modeling flexibility to the change of system conditions...
This paper presents a formal approach to model the traffic operational processes on a Maglev train example based on Stochastic Petri nets. The Maglev train is modeled with respect to process, function and dependability. Process model describes the normal running status and abnormal protected status of the Maglev train from departure to stopping and function model shows the working principle of propulsion...
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