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ECO AZ31 마그네슘 합금의 인장, 고주기 피로 및 피로 균열 전파 변형 거동
김민종(M. J. Kim),김관영(K. Y. Kim),김세광(S. K. Kim),임현규(H. K. Lim),박중철(J. C. Pack),이기안(K. A. Lee) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
Tensile and fatigue deformation behaviors of newly developed ECO AZ31 alloy was investigated. Microstructure analysis, tensile, high cycle fatigue, fatigue crack propagation tests were conducted. In the microstructure observation, average grain size was 3.2㎛ for AZ31 alloy and 2.7㎛ for ECO AZ31 alloy. Alloys consisted of Mg matrix containing minute amounts of Mg17Al12, Al6Mn, Mg12(Al, Zn)49phases. Tensile results showed that the properties of ECO AZ31 alloy (T.S: 314.6MPa, Y.S: 188.7MPa, elongation: 20.2%) were superior to those of AZ31 alloy (T.S: 306.4MPa, Y.S: 177.6MPa, elongation: 17.7%). High cycle fatigue limit of AZ31 (set at 10<SUP>7</SUP> cycles) was 140MPa and that of ECO AZ31 alloy was 160MPa. Result of fatigue crack propagation experiment, both alloys showed similar fatigue crack propagation rate. The cause of better properties the new ECO alloy was also discussed based on the fractography observations.
산전 유전 검사로 진단된 3회 연속적인 모계 기원의 가족성 partial trisomy 4p와 4/22 전좌 이상(translocation) 예
양영호,김경수,김세광,김인규,민혜원,송찬호,Yang, Y.H.,Kim, G.S.,Kim, S.K.,Kim, I.K.,Min, H.W.,Song, C.H. 대한생식의학회 1994 Clinical and Experimental Reproductive Medicine Vol.21 No.1
A 27-year-old pregnant woman who had one son with mental and growh retardation and dysmorphic features, was referred for genetic counselling. Cytogenetic investigations revealed 4/22 translocation in the mother(46, XX, t(4;22)(p14;P11)), partial trisomy 4p in son(46, XY, -22, +der(22), t(4;22)(p14;p11)mat). The father had normal karyotype. Amniocentesis and chorionic villi sampling were performed in 3 successive pregnancies. The karyotypes of fetus in 3rd, 4th pregnancies by amniocentesis were 46, XX, t(4;22)(p14;p11) and 46, XX, t(4;22) (p14;p11), and the karyotype of fetus in 5th pregnancy by chorionic villi sampling was found to be 46, XX, -22, +der(22) t(4;22)(p14;p11)mat. We report 3 succesive prenatally diagnosed familial partial trisomy 4p and 4/22 translocation of maternal origin with review of literature.
Modified Al-Si-Mg 계 조조용 합금의 ECO-Mg 함량 변화에 따른 인장 및 피로 변형 거동
함기수(G.S. Ham),백상우(S.W. Baek),김민종(M.J. Kim),김세광(S.K. Kim),윤영옥(Y.O. Yoon),조규상(K.S. Cho),이기안(K.A. Lee) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
The effect of ECO-Mg addition on the microstructure, tensile and fatigue deformation behaviors of modified Al-Si-Mg casting alloy was investigated. Four different alloys having various amounts of ECO-Mg (0.3, 0.4, 1.0 and 1.5 wt.%) were prepared though sand casting process. OM microscopy, Scanning Electron Microscope (SEM), Energy Dispersive Spectrometer (EDS) and X-ray Diffraction (XRD) analyses was examined as well as hardness, tensile, and fatigue tests. Modified aluminum alloy consisted of α-Aluminum (dendrite shape), eutectic Si, Mg₂Si and Fe-intermetallic phases. It was found that DAS(Dendrite Ann Spacing) gradually decreased and eutectic Si, Fe-intermetallic phases were more finely distributed in the matrix with increasing the amount of ECO-Mg. Tensile and fatigue properties were also improved with increasing ECO-Mg content. The micro-mechanisms of tensile and fatigue deformations of the alloy were also discussed based on the fractography observation results.
김영태 ( Y. T. Kim ),박용원 ( Y. W. Park ),김세광 ( S. K. Kim ),양영호 ( Y. H. Yang ),송찬호 ( C. H. Song ) 대한주산의학회 1990 Perinatology Vol.1 No.1
Down syndrome is by far the most common and best known of the chromosome disorders. Down syndrome can usually be diagnosed at birth or shortly thereafter by its phenotypic features. Recently direct access to fetal blood during the second and third trimesters of pregnancy opens new fields of prenatal diagnosis and in utero fetal treatment. Cordocentesis (percutaneous umbilical blood sampling), a method that involves ultrasonographically guided needle insertion into the umbilical vein, appeares to have an acceptable clinical trial. A case of Down syndrome diagnosed by cordcentesis is presented with brief review of literature.