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남윤성,김남근,최명진,박상희,정기화,이숙환,윤태기,차광열,Nam, Y.S.,Kim, N.K.,Choi, M.J.,Park, S.H.,Chung, K.W.,Lee, S.H.,Yoon, T.K.,Cha, K.Y. 대한생식의학회 1998 Clinical and Experimental Reproductive Medicine Vol.25 No.3
Premature ovarian failure is a condition causing amenorrhea, hypoestrogenism, and elevated gonadotropins in women younger than 40 years. Many causes of premature ovarian failure were reported, including genetic abnormalities, enzymatic defects, defects in gonadotropin secretion or action, autoimmune disorders, physical and idiopathic causes. Recently, Finnish group reported a point mutation in the follicle stimulating hormone (FSH) receptor gene in premature ovarian failure patients. But it was reported that the group from United States could not find any mutation in FSH receptor gene. So we analysed C566T point mutation of FSH receptor gene using restriction fragment length polymorphism (RFLP) and compared the result between premature ovarian failure patient with idiopathic and known causes. But we did not find 556C${\rightarrow}$T mutation in the FSH receptor gene in both groups. These findings suggest that the missense mutation in the human FSH receptor gene reported in Finnish women with premature ovarian failure is uncommon in Korean women with premature ovarian failure.
전자 비임 용접한 7075 T6 알루미늄 합금의 자연시효
강춘식,황선효,김숙환 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.12
The effect of the heat input (H.I) and natural aging on the mechanical properties and microstructure of the electron beam welded 7075-T6 aluminum alloy has been investigated. This study leads to the following conclusions. 1) The hardness of weldment increased with decreasing H.I. (518.1-1281.8 J/㎜) and increasing natural aging time (5-60 days). 2) The hardness generally increased with distance from the weld metal, though a little decrease in hardness occurred in HAZ(II). 3) The natural aging of the weldment for 100 days raised the tensile strength by about 13% and decreased the absorbed energy by about 35% compared to the 20 day-naturally aged weldment.