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유승원(S. W. You),강성모(S. M. Kang),김용모(Y. M. Kim) 한국전산유체공학회 2001 한국전산유체공학회지 Vol.6 No.1
The transient laminar reacting flows around fuel droplet have been numerically analyzed. The physical models used in this study can account for the variable thermophysical properties and the chemistry is represent by the one-step global reaction model. The present study is focused on the vaporization and ignition characteristics, flame structure including wake flame, transition flame and envelope flame, and interaction between droplets. Special emphasis is given to the triple flame structure and flame stabilization.
유승원(You Seoung won) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Tail gate operation effort by user is very important factor of IQS. Tail gate gas lifter is useful equipment to assist user by making easy open & close tail gate. But it is impossible that closing operation effort developed unless sacrifice low temperature bearing force. This is not because gas lifter lay-out impaired but because physical limit. In this paper, by exchanging lifter stroke at low temperature, low temperature bearing force increase, not sacrificing closing effort at normal temperature
柳勝元(Seung-Won You) 한국해양공학회 1992 韓國海洋工學會誌 Vol.6 No.1
In this study, the variation of fatigue strength in CF/PEEK and CF/EPOXY, the matrix and interfacial strength of which differ from each other, has been studied from the viewpoint of microfracture behavior.<br/> The results obtained are as follows ;<br/> According as the fatigue strength moves from the lower cycle range to the higher cycle range, that of CF/PEEK shows higher curve than that of CF/EPOXY does.<br/> In the early stage of fatigue life, the characteristic of fatigue crack in CF/PEEK is mainly the fracture of longitudinal fiber, while that in CF/EPOXY is the fracture of transverse fiber.<br/> The difference of fatigue strength in these materials can be explained by the fracture criteria of transverse fiber and longitudinal fiber.
유승원(S. W. You),강성모(S. M. Kang),김태준(T. J. Kim),김용모(Y. M. Kim) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
The transient laminar reacting flows around fuel droplet have been numerically analyzed. The physical models used in this study can account for the variable thermophysical properties and the chemistry is represent by the one-step global reaction model. The present study is focused on the vaporization and ignition characteristics, flame structure including wake flame, transition flame and envelope flame, and interaction between droplets. special emphasis is given to the triple flame structure and flame stabilization.
[論文] 複合組織鋼의 機械的特性에 미치는 微視組織因子의 영향
김정규(J.K.Kim),유승원(S.W.You) 한국자동차공학회 1987 오토저널 Vol.9 No.3
<br/> A study has been made to clarify the microstructural effect On static tensile properties of the dual phase steel, in which the martensitic phase encapsulated islands of ferritic phase.<br/> The main results are as follows:<br/> Yield strength is associated with the degree of plastic constraint factor and tensile strength increases with increasing of strain hardening exponent. Also, the variation of ductility is dependent upon the amount of micro-brittle facets.
[論文] 複合組織鋼의 衝擊破壤特性에 미치는 노치形狀 및 硬度比의 영향
김정규(J.K.Kim),유승원(S.W.You),김일현(I.H.Kim) 한국자동차공학회 1988 오토저널 Vol.10 No.2
Effect of Notch Shape and Hardness Ratio on Characteristics of Impact Fracture in Dual Phase Steels.<br/> In this study, it is investigated the effect of notch shape and hardness ratio on the charac-teristics of impact fracture in dual phase steels. The impact test was carried out at the tempera-ture range from -40℃ to room temperature with Instrumented Charpy Impact Tester.The main results obtained are as follows;<br/> 1.The maximum impact bending strength(σ_max)increases with the tensile strength. Also, the impact enerty depends on σ_max.<br/> 2.In room temperature, the impact energy depends on crack-initiation energy(E_i)in case of the high hardness ratio (R=3.4), whereas depends on crack-propagation energy(E_p)in case of the low hardness ratio(R=1.8)and the dependence of crack-initiation energy of the impact characteristics decreases with increasing test temperature.These phenomena are results from the difficulty of cleavage facet formation.
학교체육시설물-철봉의 강도규정 및 이의 평가방법 개발에 관한 연구
강기원 ( Ki Weon Kang ),안병화 ( Byoung Hwa Ahn ),유승원 ( Sueng Won You ),도영민 ( Young Min Do ) 한국스포츠정책과학원(구 한국스포츠개발원) 2003 체육과학연구 Vol.14 No.1
학교체육시설물의 안전성 및 효율성을 향상시키기 위해서는 이의 구체적인 요건을 정하는 표준규격의 제정이 요구된다. 이러한 표준 규격은 품질규정, 형상규정 및 강도규정 등으로 세분화될 수 있으며 이 중 표준 규격의 핵심요소인 강도규정은 학교체육시설물이 보유하여야 하는 기준강도에 대한 내용을 포함하므로 이의 적합한 설정은 매우 중요하다. 또한 이와 같이 설정된 강도규정의 타당성 및 적합성을 검증하기 위해서는 강도규정에 대한 시험방법의 선정 역시 매우 중요하다. 그러나 철봉으로 대표되는 학교체육시설물은 대부분 운동장과 같은 야외에 설치·운영되고 또한 이의 운동형태가 매우 다양하므로 기존의 시험방법으로는 이에 대한 시험평가가 매우 어려운 실정이다. 따라서 본 논문에서는 대표적인 학교체육시설물인 야외용 철봉의 강도규정 및 이의 평가를 위한 시험방법을 제정하고 이들의 적합성 및 타당성 검증에 대한 연구를 수행하였다. The present study is aiming at developing the strength specification and evaluation methodology in horizontal bars intended for permanent installation for use at elementary, middle and high schools. For these purpose, the strength specification is, firstly, established through the structural analysis considering the environmental, service and loading conditions of horizontal bars. Additionally, an evaluation methodology is developed to identify the usefulness and conformity of the strength specification. And then this study ends with the tests for prototype of horizontal bars according to the strength specification and evaluation methodology through a portable universal testing machine, which is designed to be able to adjust the loading direction and operate outdoors.