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변보석 ( Bo Suk Byun ),최요철 ( Yo Chul Choi ),박영택 ( Young T Park ) 한국품질경영학회 2013 품질경영학회지 Vol.41 No.4
Purpose: The purpose of this study is to propose an Integrated Safety Evaluation Process (ISEP) that can enhances the safety aspect of the safety-critical system. This process utilizes the advantages of the iterative Systems Engineering process combined with the safety assessment process that is commonly and well defined in many standards and/or guidelines for railway, aerospace, and other safety-critical systems. Methods: The proposed process model is based on the predefined system lifecycle, in each phase of which the appropriate safety assessment activities and the safety data are identified. The interfaces between Systems Engineering process and the safety assessment process are identified before the two processes are integrated. For the integration, the elements at lower level of Systems Engineering process are combined with the relevant elements of safety assessment process. This combined process model is represented as Enhanced Functional Flow Block Diagram (EFFBD) by using CORE® that is commercial modelling tool. Results: The proposed model is applied to the lifecycle and management process of the United States aircraft system. The US aircraft systems engineering process are composed of twelve key elements, among which the requirements management, functional analysis, and Synthesis processes are considered for examplenary application of the proposed process. To synchronize the Systems Engineering process and the safety assessment process, the Systems Engineering milestones are utilized, where the US aircraft system has thirteen milestones. Taking into account of the nine steps in the maturity level, the integrated process models are proposed in some phases of lifecycle. The flows of processes are simulated using CORE®, confirming the flows are timelined without any conflict between the Systems Engineering process and the safety assessment process. Conclusion: ISEP allows the timeline analysis for identifying activity and data flows. Also, the use of CORE®is shown to be effective in the management and change of process data, which helps for the ISEP to apply for the development of safety critical system. In this study, only the first few phases of lifecyle are considered,however, the implementation through operation phases can be revised by combining the elements of safety activities regarding those phases.
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장승환 ( Seung Hwan Jang ),변보석 ( Bo Suk Byun ) 대한설비관리학회 2015 대한설비관리학회지 Vol.20 No.2
This study describes the results of Preliminary Hazard Analysis (PHA) performed for Train Control System (TCS) of Honam KTX Line. PHA is performed to identify hazards at system level based on the risk-based approach followed by IEC 61508 and other relevant international standards. The hazards are firstly classified by the operational functions of railway system proposed by AEIF (The European Association for Railway Interoperability). Then, the hazards are identified in more detail according to the function of TCS in the process of the railway operation. In doing this, the relevant equipment among TCS are identified. The result shows that PHA can be used to demonstrate which hazard could be expected and which consequences could occur in the process of railway operation as the result of their functional failure(s). This way of description is a starting point for an operation or technical realization demanding TCS. In addition, the result can be used for allocating Safety Integrity Level (Sn") for each subsystem composing TCS and for generating any safety requirements that might not be taken into account in the system requirements.
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장승환 ( Seung Hwan Jang ),김대현 ( Dae Hyun Kim ),변보석 ( Bo Suk Byun ) 대한설비관리학회 2015 대한설비관리학회지 Vol.20 No.3
This paper demonstrates the result of Safety Integrity Level (SIL) allocation for Honam KTX Train Control System (TCS), by applying the semi-quantitative approach. TCS is defined in this paper as the set of TVM SEI, Supplementary Safety Equipment, Power Equipment, TCS Integrated Maintenance System (TIMS), and Local Control Panel (LCP). SIL allocation is performed for these constituent subsystems of TCS. Three approaches for SIL allocation being widely used in railway application are compared in terms of the conservativeness of the allocation result; qualitative, quantitative, and semi-quantitative methods. The semi-quantitative method, based on the risk matrix and the relationship between Tolerable Hazard Rate (THR) and SIL, is less pessimistic than the qualitative method, but more conservative than the quantitative method, in the sense that it utilizes more information (e.g., risk reduction factors involved in the hazard occurrence) than the qualitative method which purely depends on the configuration of Risk Graph. Based on three principles of the semi-quantitative method, the SIL allocation process is performed for the subsystems composing TCS.
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