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Alloy 600 노즐관통부의 이종금속용접 잔류응력에 따른 응력부식균열 거동 분석
김성우,김홍표,김동진,정재욱,장윤석,Kim, Sung-Woo,Kim, Hong-Pyo,Kim, Dong-Jin,Jeong, Jae-Uk,Chang, Yoon-Suk 한국압력기기공학회 2010 한국압력기기공학회 논문집 Vol.6 No.2
This work is concerned with the analysis of stress corrosion cracking(SCC) behavior of Alloy 600 nozzle penetration mock-up according to a residual stress induced by a dissimilar metal welding(DMW) in a nuclear reactor pressure vessel. The effects of the dimension and materials of the nozzle penetration on the deformation and the residual stress induced by DMW were investigated using a finite element analysis(FEA). The inner diameter(ID) change of the nozzle by DMW and its dependance on the design variables, calculated by FEA, were well consistent with those measured from the mock-up. Accelerated SCC tests were performed for three mock-ups with different wall thicknesses in a highly acidic solution to investigate mainly the effect of the residual stress on the SCC behavior of Alloy 600 nozzle. From a destructive examination of the mock-up after the tests, the SCC behavior of the nozzle was fairly related with the residual stress induced by DMW : axial cracks were found in the ID surface of the nozzle within the J-weld region where the highest tensile hoop stress was predicted by FEA, while circumferential cracks were observed beyond both J-weld root and toe where the highest tensile axial stress was expected.
망막분지정맥폐쇄에서 황반중심부의 후유리체박리가 황반부종에 미치는 영향
김성우,오인경,오재령,허걸,Seong Woo Kim,In Kyung Oh,Jae Ryung Oh,Kuhl Huh 대한안과학회 2006 대한안과학회지 Vol.47 No.3
Purpose: To quantitatively compare the role of posterior vitreous detachment in macular edema associated with branch retinal vein occlusion (BRVO) using OCT. Methods: A retrospective study of 36 eyes with BRVO-associated macular edema was carried out from November 2003 to February 2005. There was posterior vitreous detachment (PVD) in 23 eyes [PVD (+) group], and vitreoretinal attachment on the fovea in 31 eyes [PVD (-) group]. PVD was detected with an indirect ophthalmoscope or 90D lens. The foveal thicknesses of the two groups were measured and compared. Results: The mean foveal thicknesses of the PVD (-) and PVD (+) groups were 398.0±217.2 ?m and 233.6±80.6 ?m, respectively (p=0.000, Mann-Whitney test). The mean BCVA (log MAR) was 0.77±0.52 in the PVD (-) group and 0.40±0.37 in the PVD (+) group (p=0.002, Mann-Whitney test). Conclusions: The extent of macular edema associated with BRVO was significantly less in the PVD(+) group and BCVA was significantly better in the PVD (+) group as well.
동서양 건축에서의 '형태'의 의미 - '형상(形象)'과 '기형(氣形)'의 개념을 중심으로-
김성우,Kim, Sung-Woo 한국건축역사학회 2003 건축역사연구 Vol.12 No.4
This paper aims to identify the meaning of architectural form of the East and the West. Ordinarily, we know the visual differences of architectural form between the two cultural families, and the technical reasons of such differences. However, the East and the West have their own views of architectural form that are derived from their own views of architecture, and again the views of architecture are rooted in their own views of the world. The paper maintains a comparative stance between the two cultures in analyzing the different concepts of architectural form, and employ the ideas of 'Form(形象)' and 'Energy-Form(氣形)' as a kind of representative concept of the two views of architectural form. It is discussed that the idea of Form pursued the realization of ultimate substance which is less materialistic but more ideal., while, the idea of Energy-Form pursued the realization of oneness and health through mutual interaction between man, architecture and nature. Architectural form in the West has been the purposeful expression of human ideal, while in the East, it was an expediential device for better energy condition. It seems important to understand such differences of the meaning of architectural form between the East and the West, since, in present time, we tend to think that the Western conception of architectural form is the only possible one. But it is not generally known that the Western conception of form has very particular background reason of its own which is unique to Western culture, and on the other hand, the nature of East Asian conception of architectural form is generally unknown.
현대정유 - 디지털시대의 최강자로 거듭나는 현대정유 오일뱅크
김성우,Kim, Seong-U 대한석유협회 2000 석유와 에너지 Vol.2000 No.5
석유협회보는 기간산업으로서 국가경제발전의 한 축을 이루고 있는 국내 정유회사들의 현재 추진사업과 21세기 사업방향을 소개하여 독자들의 정유회사에 대한 이해를 돕기 위해 회원사리뷰를 연재하고 있다.<편집자주>
비례(比例)와 기운(氣韻) - 동서양 건축에서의 심미성 -
김성우,Kim, Sung-Woo 한국건축역사학회 2005 건축역사연구 Vol.14 No.2
All architectures in the history have certain attitudes of aesthetic expression of their own. Depending on the culture, such aesthetic attitudes are not the same but different. This paper aims to identify the nature of the difference of aesthetic attitude in the architectures of the East and the West. As a way of approach for this purpose, two keywords are employed as representative concept. They are: 'proportion' and 'vitality'. Proportion, of course, represent the attitude of the Western, while, vitality, the Eastern. Although these two words are subjective selection, it is hoped that the nature of aesthetic attitudes could be observed through the windows of these two representative concepts. We all know that the architects and students of architecture of this period, are very much concerned about the aesthetic expression of their design. However, the value judgement of aesthetic quality seems quite confused in modem period. If the nature of aesthetic attitudes of the Eastern and the Western architecture is well understood, such understanding will help much for the direction of architectural aesthetic of future architecture.