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- 저자 : Mayaka, Joyce (검색결과 3 건)
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M. Hasan,Joyce K. Mayaka,정재천 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.6
This article presents a new design of earthquake instrumentation that is suitable for quick decisionmakingafter the seismic event at the nuclear power plant (NPP). The main objective of this work is toensure more availability of the NPP by expediting walk-down period when the seismic wave is incident. In general, the decision-making to restart the NPP after the seismic event requires more than 1 month ifan earthquake exceeds operating basis earthquake level. It affects to the plant availability significantly. Unnecessary shutdown can be skipped through quick assessments of operating basis earthquake, safeshutdown earthquake events, and damage status to structure, system, and components. Multidecisionparameters such as cumulative absolute velocity, peak ground acceleration, Modified Mercalli IntensityScale, floor response spectrum, and cumulative fatigue are discussed. The implementation scope on thefield-programmable gate array platform of this work is limited to cumulative absolute velocity, peakground acceleration, and Modified Mercalli Intensity. It can ensure better availability of the plant throughintegrated decision-making process by automatic assessment of NPP structure, system, and components.
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Application of Sequence Diagrams to the Reverse Engineering Process of the ESf-ccs
Hasan, Md. Mehedi,Elakrat, Mohamed,Mayaka, Joyce,Jung, Jae Cheon The Korean Society of Systems Engineering 2019 시스템엔지니어링학술지 Vol.15 No.1
Reverse engineering involves examining a system or component so as to comprehend its structure, functionality, and operation. Creation of a system model in reverse engineering can serve several purposes: test generation, change impact analysis, and the creation of a new or modified system. When attempting to reverse engineering a system, often the most readily accessible information is the system description, which does not readily lend itself to use in Model Based System Engineering (MBSE). Therefore, it is necessary to be able to transform this description into a diagram, which clearly depicts the behavior of the system as well as the interaction between components. This study demonstrates how sequence diagrams can be extracted from the systems description. Using MBSE software, the sequence diagrams for the Engineered Safety Features Component Control System (ESF-CCS) of the Nuclear Power Plant are created. Sequence diagrams are chosen because they are a means of representing the systems behavior and the interaction between components. In addition, from these diagrams, the system's functional requirements can be elicited. These diagrams then serve as the baseline of the reverse engineering process and multiple system views are subsequently be created from them, thus speeding up the development process. In addition, the use of MBSE ensures that any additional information obtained from auxiliary sources can then be input into the system model, ensuring data consistency.
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APPLICATION OF SEQUENCE DIAGRAMS TO THE REVERSE ENGINEERING PROCESS OF THE ESF-CCS
정재천,Md. Mehedi Hasan,Mohamed Elakrat,Joyce Mayaka 한국시스템엔지니어링학회 2019 시스템엔지니어링학술지 Vol.15 No.1
Reverse engineering involves examining a system or component so as to comprehend its structure, functionality, and operation. Creation of a system model in reverse engineering can serve several purposes: test generation, change impact analysis, and the creation of a new or modified system. When attempting to reverse engineering a system, often the most readily accessible information is the system description, which does not readily lend itself to use in Model Based System Engineering (MBSE). Therefore, it is necessary to be able to transform this description into a diagram, which clearly depicts the behavior of the system as well as the interaction between components. This study demonstrates how sequence diagrams can be extracted from the systems description. Using MBSE software, the sequence diagrams for the Engineered Safety Features Component Control System (ESF-CCS) of the Nuclear Power Plant are created. Sequence diagrams are chosen because they are a means of representing the systems behavior and the interaction between components. In addition, from these diagrams, the system’s functional requirements can be elicited. These diagrams then serve as the baseline of the reverse engineering process and multiple system views are subsequently be created from them, thus speeding up the development process. In addition, the use of MBSE ensures that any additional information obtained from auxiliary sources can then be input into the system model, ensuring data consistency.
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