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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.
정재민(J.M. Jung),최우연(W.Y. Choi),최승복(S.B. Choi),정재천(C.C. Cheong) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
This paper presents an active position control of a single-rod system featuring an electro rheological(ER) fluid based valve. The ER fluid to be employed to the proposed system is composed and its Bingham property is evaluated as a function of electric fields. Subsequently, a plate type of ER valve is designed on the basis of the field-dependent Bingham model and manufactured. Performance test of the ER valve is undertaken by evaluating pressure drop with respect to the number of electrodes as well as the intensity of electric fields. The ER valve cylinder system is then constructed and its governing equation of motion is derived. A neural control scheme for position control of the cylinder is established by incorporating with proportional-plus-derivative(PD) controller and consequently implemented. Experimental results of both regulating and tracking control responses are presented in order to demonstrate the effectiveness of the proposed methodology.<br/>
결핵환자에서 혈청 Angiotensin Converting Enzyme ( ACE ) 활성도와 Tuberculin 반응도의 관계에 대한 연구
조인호(I . H . Jo),도준영(J . Y . Do),김종호(J . H . Kim),이재익(J . Y . Lee),정재천(J . C . Jung),이현우(H . W . Lee),이영헌(Y . H . Lee) 대한내과학회 1989 대한내과학회지 Vol.37 No.5
N/A Angiotensin converting enzyme (ACE) is reported to be elevated in patients with sarcoidosis, Gaucher`s disease, leprosy, silicosis, asbestosis, and histiocytic medullary reticulosis. The serum ACE activity was measured in 45 patients with tuberculosis, 6 patients with cnacer, and 50 normal controls. To investigate the correlation between serum ACE activity and delayed hypersensitivity, tuberculin skin tests were performed and the results were compared with serum ACE levels in patients with pulmonary tuberculosis. The results were as follows: 1) The serum ACE level in tuberculosis patients was not higher than in the normal control group (p>0.1). 2) The serum ACE level in cancer patients tended to be lower than in the normal control group(p<0.1). 3) A correlation between serum ACE activity and the severity of pulmonary tuberculosis was not present. 4) There was a significant inverse correlation between the diameter of the cutaneous reaction to tuberculin and serum ACE is not a useful parameter to indicate severity and progress of pulmonary tuberculosis and that there is an inverse correlation between delayed hypersensitivity and serum ACE level. We suggest that this inverse relationship results from competition for the relevant signal molecules on the macrophage surface.