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정재천,박용환 대한건축학회 2002 대한건축학회논문집 Vol.18 No.12
The research's purpose are to analyze the diverse requirements of storage space which would be added or subtracted. Besides, it is to aim for the factors about the changed amount according to the family types for the shake of the functional systematical storage space design as the resident might be adjusted at their house. As a matter of fact, there are a lot of problems of the unsuitability as well as the inconvenience when residents are living in there house, because the storage space to be planned is to be designed excluding the consideration of residential need and patterns. Therefore, through various surveys and analyses on actual conditions, we found storage types in each households and proper using ways of storage space applicable in these residential characteristics. Finally, through residential factors, we obtained basically architectual planning documents for storage space planning of households.
정재천,Ibrahim Ahmed 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.4
Design engineering process for field programmable gate array (FPGA)-based reactor tripfunctions are developed in this work. The process discussed in this work is based on thesystems engineering approach. The overall design process is effectively implemented bycombining with design and implementation processes. It transforms its overall developmentprocess from traditional V-model to Y-model. This approach gives the benefit ofconcurrent engineering of design work with software implementation. As a result, it reducesdevelopment time and effort. The design engineering process consisted of five activities,which are performed and discussed: needs/systems analysis; requirementanalysis; functional analysis; design synthesis; and design verification and validation. Those activities are used to develop FPGA-based reactor bistable trip functions that triggerreactor trip when the process input value exceeds the setpoint. To implement designsynthesis effectively, a model-based design technique is implied. The finite-state machinewith data path structural modeling technique together with very high speed integratedcircuit hardware description language and the Aldec Active-HDL tool are used to design,model, and verify the reactor bistable trip functions for nuclear power plants.
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.
정재천,송치성,Jung, Jae Cheon,Song, Chi Sung 한국시스템엔지니어링학회 2020 시스템엔지니어링학술지 Vol.16 No.1
A big data processing method to predict solar power generation using systems engineering approach is developed in this work. For developing analytical method, linear model (LM), support vector machine (SVN), and artificial neural network (ANN) technique are chosen. As evaluation indices, the cross-correlation and the mean square root of prediction error (RMSEP) are used. From multi-variable comparison test, it was found that ANN methodology provides the highest correlation and the lowest RMSEP.
정재천 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.2
The automatic seismic trip system (ASTS) continuously monitors PGA (peak ground acceleration) from the seismic wave,and automatically generates a trip signal. This work presents how the system can be designed by using a systems engineeringapproach under the given regulatory criteria. Overall design stages, from the needs analysis to design verification, have beenexecuted under the defined processes and activities. Moreover, this work contributes two significant design areas fordigitalized ASTS. These are firstly, how to categorize the ASTS if the ASTS has a backed up function of the manual reactortrip, and secondly, how to set the requirements using the given design practices either in overseas ASTS design or similardesign. In addition, the methodology for determining the setpoint can be applied to the I&C design and development projectwhich needs to justify the error sources correctly. The systematic approach that has been developed and realized in this workcan be utilized in designing new I&C (instrument and control system) as well.