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최선호 대한산부인과학회 1990 Obstetrics & Gynecology Science Vol.33 No.12
자궁내막암은 전암병변인 자궁내막증식증은 근래 estrogen제제의 사용증가 이외에도 그 원인이 progesterone의 작용 없는 상태에서 estrogen의 지속적인 자극이므로 점차 생존연령이 상승되어 폐경후 상태가 오랜 기간이 되므로 내인성 estrogen의 계속적인 자극과 식이의 서구화에 따른 비만의 증가로 인하여 발생이 증가하리라 생각된다. 그러나 학자에따라 분류가 다양하여 임상의사와 병리의사 간에 그 진단이 뜻하는 정확한 상태를 알기 위해 서로 협조가 필요하고 우리나라도 혼돈을 막기 위해 자궁내막증식의 분류를 통일할 필요가 있다. 그리고 자궁내막증식이 세포학적이형증을 동반하면 자궁내막암을 발생할 위험이 크므로 세포학적 이형층 유무를 아는것이 치료방침을 선택하는데 매우 중요하다.
최선호,권재도,서인보 대한기계학회 1983 대한기계학회논문집 Vol.7 No.4
For the determination of stress intensity factors, three methods have been used conventionally; the photoelastic method, the compliance method and the electrical resistance method. These methods, however, have common short coming upon experimental performance; the difficulty of cutting out sharp crack tips and arbitray crack forms similar to the practical one on the specimen. to eliminate this flaw, one of the author previously presented new methods, that is, for the determination of $K_{III}$ mode, the membrane analogy was applied and the slab analogy was used for the determination of $K_{I}$ and $K_{II}$ . The validity of this method was proved through the performance of a series of experiments of which theoretical solution are known.n.n.
모아레法 과 스라브相似 의 複合 에 의한 應力擴大係數 의 實驗的 解析法 -有限板크랙 의 $K_I$ 및 $K_II$-
최선호,권재도,김종주,채영석 대한기계학회 1982 대한기계학회논문집 Vol.6 No.4
The slab analogy method was introduced in the 1920's for the first time as a new experimental stress analysis method. Notwithstanding its theoretical propriety, this method has not been recognized as efficient one because of its difficulty in practical measurement of the slab curvature. In this paper, aiming at experimental determination of two-dimensional stress intensity factors(S. I. F) of arbitrarily shaped cracks which had been regarded as almost impossible by conventional method, the slab analogy was reevaluated. Measuring of slab curvature was replaced by three simple measuring factors to overcome vital slab-analogy's shortcoming by joint use of the shadow-moire method. A determination formula was also derived from the theory of fracture mechanics. By this newly exploited method, it was found that the slab analogy still has its great advantage in determination of S.I.F. of arbitrarily shaped cracks with considerable accuracy compared with existent experimental methods.
Ni 첨가가 볼밀링한 MoSi$_2$분말성형체의 소결속도에 미치는 영향
최선호,홍경태,김영도,문인형 한국분말야금학회 1998 한국분말재료학회지 (KPMI) Vol.5 No.4
Sintering kinetics of ball-milled $MoSi_2$ was studied with the addition of Ni. $MoSi_2$ powder with the average particle size of 1 $\mu\textrm{m}$ was obtained from ball-milling of 10 $\mu\textrm{m}$ powder. Small amount of Ni was added to the ball-milled $MoSi_2$ powder by salt solution and reduction method. The powder was compacted into cylindrical shape at 200 MPa and isothermally sintered in a $H_2$ atmosphere at the temperature range of 1100~$1400^{\circ}C$ for 3~600 minutes. The changes of linear shrinkage and sintered density were monitored as a function of sintering time. The microstructure was observed by using optical microscopy and scanning electron microscopy. Phases were identified by X-ray diffratometer and electro-probe micro analysis. Sintering kinetics of Ni-added powder was compared to as-milled powder and the apparent activation energy was calculated from Arrhenius plot.
편심 경사균열 을 가진 판 이 순수굽힘 을 받는 경우의 응력확대계수
최선호,조상봉 대한기계학회 1985 대한기계학회논문집 Vol.9 No.1
In the fracture mechanics, the determination of the stress intensity factor value is vital for the prediction of a material fracture behavior. So many data concerning to the S.I.F. have been presented by many investigations to meet endless requrement. In this paper, the stress intensity factors of a sheet with an eccentrically inclined crack subjected to the pure bending moment were investigated theoretically by using of the complex mapping function to determine the Muskelishvili's comlex stress functions. Moreover, the theoretical value was compared with the result obtained from photoelastic esperiment. As a result, it was confirmed that both values coincided with satisfactorily within the margin of 2-3% devition; The results theoretically derived are right. 본 논문에서는 편심 경사진 균열을 가진 판이 순수굽힘을 받는 경우에 등각사 상함수를 발견하고 등각사상법에 의한 복소응력함수를 사용하여 응력확대계수의 근사 이론식을 구하고 광탄성 실험을 통하여 비교 고찰하였다.
최선호,박용수 대한기계학회 1986 대한기계학회논문집 Vol.10 No.3
In an attempt to develop a method for the design of the aerial rope way, the traditional theories of rope way were examined and compared. The resulting formulas of the traditional and approximate parabolic curve theory were summarized and those of the catenary curve theory as an exact ones were summarized and newly developed when necessary. In particular, it was found that the resulting formulas from both of these theories can fully be expressed with only three dimensionless parameters $U^{*}$, $V^{*}$, and $W^{*}$, improving compactness and generality of these formulas. Comparision of the theories were done through error analysis, and it was shown that the error of the approximate parabolic curve is of order $U^{*2}$ and $V^{*}$. From this, it was concluded that the traditional parabolic curve theory has its limitation when the rope way becomes larger or steeper, leading to the necessity of the use of catenary curve theory.ve theory. 본 연구에서는 가공삭도의 선로설계에 최적화기법을 도입하여 시행착오법보다 신속.정확하면서도 경제성이나 승차감등이 항상된 설계를 위한 절차를 개발하고자 한 다. 이를 위하여 먼저 본 논문에서는 설계에 적용될 선로의 기본이론들을 정리, 혹 은 유도 하였다. 특히 기존의 포물곡선이론의 정확성을 규명하기 위하여 엄밀해인 현수곡선이론을 여러경우에 대하여 유도하고 그 오차를 계산하였다. 계산된 오차는 오차해석을 통하여 추측 될 수 있었으며 본 연구에서는 정의된 무차원군들과의 연관 성도 검토되었다.