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- 저자 : Koo, Ok Jae (검색결과 46,344 건)
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[구조강도부문] 디젤기관 캠-롤러 접촉부의 표면아래 응력해석
구영필(Youngpil Koo),이문주(munju Lee),조용주(Youngjoo Cho) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, the subsurface stress field beneath the roller by fluid film pressure working on the roller surface has been calculated by using the rectangular patch solution. Main purpose of this study in view of engineering is to prove the validity of the profiling roller presented by Koo et al. Koo et al. obtained the fluid film pressure by EHL analysis of earn-roller mechanism. To prove the advantage of this study, we compared Koo's profiling with the existing Dub-off profiling roller. To obtain the subsurface stress field created by normal force, namely, fluid film pressure, Love's solution is used.
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표준화재에 노출된 무피복 메가 CFT 기둥의 온도분포 및 강도 예측
이철호(Lee, Cheol Ho),류이현(Ryu, Ihyun),신동진(Shin, Dong Jin),구자훈(Koo, Ja Hun),염경수(Yom, Kyong Soo) 한국강구조학회 2021 한국강구조학회 논문집 Vol.33 No.1
In this study, three representative methods that can be used to predict the temperature distribution of unprotected CFT columns under standard fire were evaluated based on recent large-size testing data. Among the three methods evaluated, Koo-Lee-Ahn’s method (2013) was most versatile and provided most satisfactory predictions, with its prediction accuracy being improved as the fire exposure time increased. For the standard fire exposure of 180 min, the plastic compressive strength of unprotected square CFT columns with a width of 700 mm, 1,000 mm, and 1,400 mm was calculated to retain 39 %, 44 %, and 47 % of respective cold column strength. The reduction of the plastic compressive strength due to inelastic buckling was just moderate (about 10 %) for a slenderness of L/D = 5.0 and an effective buckling length factor of K = 1.0, and almost negligible under the same condition with K = 0.5. With adding 6 % fire reinforcement, the allowable load ratio was increased to around 0.60, thus indicating that unprotected fire design of mega CFT columns is practically feasible. The results of this study can be conveniently used when implementing the performance based fire design of unprotected CFT columns under the framework of simple calculation method.
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초등수학교육의 현대화에 따른 교육내용의 개선 및 교사교육에 관한 연구
구광조,유병림,오병승 한국수학교육학회 1971 수학교육 Vol.9 No.2
In this report, it is assumed in the first chapter, various motives for modernizing of school mathematics can be indicated as the development of modern mathematics the highly advanced technology, the emergence of computor, and the progress of symbol logic. It is also confirmed that its modernizing process contains the modernization of contents in school mathematics, the broad application of school mathematics, the intellectualization of school mathematics, and the variation of its educational process. And the following chapter of this report is composed of the comparative study on the modernizing tendency of school mathematics among the SMSG of U. S. A., the mathematical education in France, and the late tendancy of Japan. The most significant part of the report is the chapter which propose the new program for school mathematics. It establishes the direction of school mathematics and its purpose. And at the same time it divides its fundamental conceptions into six parts according to school grades; the number, the operation, the functional relation, the quality and measure, the geometry, and the statistics. For the perspective of school mathematics, it is probable that the program for education and training of teachers could be realized, if it were spported by the system of specializing teachers and of functional teachers with advanced technology of education. Particularly the education of teachers contains the training of teachers as well as educational administrators or parents. Finally, the report concludes that the necessity of research required for the development of school mathematics must be emphasized in regard to the established program. of teacher training.
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