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- 저자 : Koo, Jung‐Wan (검색결과 47,005 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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청소년의 여가만족도에 관한 인지적요인과 정서적요인의 영향력
구본행 중앙대학교 스포츠과학연구소 2003 體育硏究 Vol.- No.18
This is a correlational analysis of causes and effects of leisure participation of adolescents who are 862 high school students in Seoul and Kanglyung. For the purpose of this study, a self-administered questionnaire containing cognitive domain, emotional domain, and satisfaction level was developed. Results of this study were as follows: 1) Cognitive level regarding leisure activity were influenced 29.93%(R^2=0.2993) by the causes of leisure participation. ‘Taking Break’ was the most significant reason to participate in a leisure activity. 2) Emotional level regarding leisure activity were influenced 34.12%(R^2=0.3412) by the causes of leisure participation. ‘Taking Break’ was the most significant reason to participate in a leisure activity. 3) Emotional domain was more significant variable than cognitive domain to the effects of leisure participation. ‘Challenge’ was the most significant reason to participate in a leisure activity.
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