http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
정재천,손윤경,손태중 慶北大學校 醫科大學 1989 慶北醫大誌 Vol.30 No.1
The authors studied the early ultrastructural changes of terminal bronchiole induced by x-ray irradiation. Male ICR mice were irradiated on total body with 500 rad of single dose. The lungs were observed with transmission and scanning electron microscopy at 1, 4, 8 hours and 1, 3, 5 days after irradiation. The results were summarized as follow; The ciliated cells of terminal bronchioles revealed loss and fragmentation of cilia at 1 hour after irradiation and those features were continued 1 day after irradiation. The Clara cells showed intracytoplasmic edema, loss of microvilli, and decrease of secretory granules at early phase. Ocassional cellular destruction was noted at 8 hours after irradiation. Those changes were recovered at 3 days after irradiation. From the above results it may be concluded that the ciliated cells are more susceptible to the radiation effect than clara cells and those early radiation injuries are reversible.
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.
NPP Site Selection : A Systems Engineering Approach
정재천,Pwani, Henry,Kamanja, Florah,Zolkaffly, Zulfakar,Jung, J.C. 한국시스템엔지니어링학회 2013 시스템엔지니어링학술지 Vol.9 No.1
Nuclear power plant site selection is a complex process and its successful completion is a critical milestone in the NPP development cycle. Proper siting of NPP will ensure public health and safety, environmental conservation, reduced project failure risks and a smooth NPP development process among other benefits. The objective of this paper is to demonstrate the application of systems engineering to the problem of NPP siting in Kenya. The siting process demonstrated in this paper includes stakeholder need analysis where stakeholders are identified and their needs concerning NPP site are elicited and converted into system functional requirements. A value model is then developed and potential sites iteratively subjected to three types of criteria i.e. exclusionary criteria, avoidance criteria and suitability criteria. This process is used to identify the candidate sites. An additive value model; multiple objectives Decision Analysis (MODA) is then used to calculate candidate solutions values. The site with the highest solution value score is selected. Sensitivity studies using different criterion weight sets (thereby reflecting different viewpoints) can be conducted to assess their effect on the selection of a preferred site and thereby lend additional credibility to the decision process.