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9-12%Cr강의 첨가원소 및 열처리에 따른 미세조직거동과 경도변화
주성욱,유정훈,신기삼,허성강,이재현,석진익,김병훈,김정태 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
9-12%Cr steel are getting increasing attention for expanded application as high temperature materials applicable for gas turbine compressors, steam turbine rotors, blade and casing. For efficient and extensive application of 9-12%Cr steel, the data in addition to the improvement of mechanical properties on the correlation of microstructural evolution and mechanical properties are inevitable and thus the investigation in this study is performed for the determination for the specimens heat-treated at 600, 650 and 700℃ for 1000, 3000 and 5000hrs. The microstructure of as-received specimen was tempered martensite, with a high dislocation density and secondary phases. Upon high temperature heat-treatment, the martensite lath got larger and dislocation density decreased resulting the reduction of the strength. In addition, sharp growth of secondary phases was observed in the specimen heat-treated at 700℃ for 5000hrs. A specimen aged at 600℃ and 650℃ Laves phase was observed. The hardness showed close relationship with the secondary phase particle and dislocation density.
Modified 9Cr-1Mo 강의 항온변태처리에 따른 미세조직 및 경도변화
유정훈,주성욱,허성강,신기삼,이수,정연길 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
Evolution of microstructure and its relation with hardness in the modified 9%Cr-1%Mo steel which was isothermally heat-treated has been investigated in various heat-treatment temperatures and time of duration. For microstructural and crystallographic analyses, optical microscope, scanning and transmission electron microscopes, energy dispersive spectrometer, and X-ray diffractometer were used. Vickers microhardness tester were used for the measurement of hardness. Precipitates of the complex M23C6, M(C,N) formed at grain boundaries and interiors of grains had led to the secondary hardening. Normalized specimen and all of the isothermally heat-treated ones showed no evidence of retained austenite.
Drosophila quinaria Species Group의 遺傳的 近緣關係
成耆昌,金正洙,金大鎰,金彧,金溶聲 성균관대학교 기초과학연구소 1985 論文集 Vol.36 No.2
The genetic relatedness among the Korean Drosophila quinaria species group, including D. nigromaculata, D. unispina, D. brachynephrose, and D. angularis, has been examined by using horizontal starch gel electrophoresis. The results showed that none of the ten isozyme patterns examined for these four species was identical. The average genetic similarity among the four species was found to be 0.440. The similarity among three species. D. unispina, D. brachynephrose, and D. angularis was 0.466. The relatedness was found to be closest between D. nigromaculata and D. unispina, showing 0.640. D. nigromaculata and D. angularis showed relatedness of 0.258. The results suggested that these four species appear to be genetically related at the level of sibling species. The percent polymorphism in D. brachynephrose was found to be 76.9%, showing significant genetic variations.
기업의 자금 조달과 투자 결정, 배당의 상호작용에 관한 실증연구
김기웅,강호정,방승욱 한국항공대학교 경영연구소 2000 경영연구 Vol.7 No.2
본 연구는 기업의 자금 흐름 측면에서 주요 재무의사결정 변수간의 상호 관련성을 고려하여 각 변수간의 실증적인 관계를 파악하였다. 구체적으로 기업의 주요 재무 의사결정 변수인 주식 자금조달 금액, 부채 자금조달 금액, 투자금액, 배당금액을 내생변수로 선정하고 이들에 영향을 주는 외생변수들을 선정한 후에 이들간의 실증적인 관계성이 어떠한지 연립방정식 모형을 설정하였다. 검정가설은 각 내생변수간의 독립적인 관계를 귀무가설로 설정하고 이단계 최소 자승법과 삼단계 최소 자승법을 사용하여 실증분석을 수행하였다. 검증 결과 주요 재무변수간에는 독립적인 관계를 부정할 만한 증거를 얻을 수 없었다. 본 연구는 재무의사결정간의 실증적인 관계성을 파악함에 있어서 기업의 자금흐름 측면에서 상호 관련성을 인정하여 연립방정식을 사용한 점에 그 공헌점이 있다. This study focuses on the empirical relation among the variables considering interrelation of critical financing decision variables in the side of fund flow of firms. This study selects main financing decision variables i,e, financing amount by issuing stock, debt amount, dividend amount as endogenous variables and examines the empirical relation among exogenous variables influencing endogenous variables using the simultaneous equation model. We set the null hypothesis as independent relation among endogenous variables and tests by two stage least square and three stage least square method. The result of this study shows independent relation among critical financing decision variables. The contribution of this study is to use simultaneous equation model to examine empirical relation among critical financing decision variables considering interrelation in the side of fund flow of firms.
Escherichia coli 패혈증 환자에 합병된 대칭적 하지 말단 괴사증 1예
남해성,유진홍,권순석,민준기,조현선,박민경,심병주,남유정,이지인,김진수,길욱현,조근종,신완식 대한감염학회 2005 감염과 화학요법 Vol.37 No.6
We have encountered a rare case of symmetrical peripheral gangrene complicating Escherichia coli sepsis in a 47-years-old male. He was successfully treated with antibiotics, anticoagulants, and vasodilator. To our knowledge, this is the first report on symmetrical peripheral gangrene complicating E. coli sepsis in Korea.