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급냉응고된 Ribbon을 이용한 CuAINi 형상기억합금의 결정미세화
최영택,Choe, Yeong-Taek 한국기계연구원 1992 硏究論文集 Vol.22 No.-
The mechnial properties such as fracture strength, ductility and fatigue strength of Cu shape memory alloy are lower than those of Ti-Ni SMA, because of their high elastic anisotropy and large grain size. And in order to improve the mechanical property of Cu SMA, some techniques such as casting method by addition of refining element, powder metallurgy and rapid solidification process have been studied on the refinement of the grain size of Cu SMA. This study was carried out to refine the grain size of CuAlNi SMA by applying the melt spinning method. According to this study, the conclusions are as follows; - grain size of the melt-spun ribbon was about $1\mum$ - there was not change in grain size, although increasing of hot pressing temperature -grain size of the hot-extruded specimen was about $30-40\mum$, it is more refiner than that of castings
現代社會主義憲法의 構造的 特徵 硏究 : 소련·中共·北韓憲法의 比較를 中心으로
崔榮澤 서경대학교 1984 論文集 Vol.12 No.-
The study of socialist constitution is useful for the research of the new trend of socialism and aloso is very important to overcome the ideological opposition. The socialist constitution and democratic constitution are foundamentally different, that is socialist constitution is based on Marx-Leninlism, so we have to have critical consciousness of this truth, with the change and progress of strategy of communist party, The Socialist constitution changes gradually, In most of the socialist nations, the strage of socialist constitution changed from that of People's democratic Constitution to that of socialist Constitution (amended 1960s). The stage of Constitution in soviet and socialist nations in eastern europe entered upon a developed socialist constitutional stage. But, in spite of strategical Change, socialist constitution showes several common principles, that is (from political view) 1) Proletaria dictatorship 2) Predominent position of communist party. 3) Democratic centralism 4) Proletaria internationulism 5) Socialist Legality and also, in many socialist nations goverment system is different from each other, From this point of view, the study considered the commoness and individuality of socialist constitution character in soviet, communist china, and North Korea.