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김영식,김성수 ( Y . S . Kim,S . S . Kim ) 충북대학교 산업과학기술연구소 1996 산업과학기술연구 논문집 Vol.10 No.2
Abstract_Roman Theoretical estimation of microwave reflectance from the composites of carbon fibers and epoxy matrix was conducted as a function of fiber material and its contents. The composite specimens were prepared from the carbon fibers (PAN and pit
거대 ( 巨大 ) 한 십이지장게실증 ( 十二指腸憩室症 )
김영식(Y.S. Kim),김승진(S.J. Kim),박찬종(C.J. Park) 대한소화기학회 1970 대한소화기학회지 Vol.2 No.1
The author experienced a case of large dv.odenal diver:iclosis in a 68 year old Korean female. The case is presented with the complains of epigastralgia with fullness, nausea, and vomiting, whose diagnosi.- ivas readily established by a Barium .'Vieal Upper G.I. Se: ies. On admission there is no specific signs and Jaboratory findings exept a large duodenal diver.iculum by means of upper G,I, series. During adnsission the case did no: develop particular complica'.ion.':, and also any kind of opera.ive procedure;I as done. Foiloiving only medical treatmen'; of s>mpomatic viei of gastroen.eri!is, the case felt re!atively ivell, and discharged 7 days after admisio.I several poin'.s concerning the clinical views of duodenal diverticuIa ivere briefly discu:sed.
권상우(S. W. Kwon),정원택(W. T. Jeong),공유식(Y. S. Kong),김영식(Y. S. Kim),김선진(S. J. Kim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Dissimilar friction welding were produced using 15㎜ diameter solid bar in chrome molybedenum steel(KS SCM440) to carbon steel(KS S45C) to investigate their mechanical properties. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, Virkers hardness surveys of the bond of area and HAZ and macrostructure investigations. The specimens were tested as-welded and post-weld heat-treated. The tensile strength of the friction welded steel bars was increased up to 100% of the S45C base metal under the condition of all heating time. Optimal welding conditions were n=2,000(rpm), P₁=60(MPa), P₂=100(MPa), t₁=4(s), t₂=5(s) when the total upset length is 5.4(㎜).
축계용 단조강재 보수 용접부의 피로 파괴 특성에 관한 연구
김영식(Y. S. Kim),김종호(J. H. Kim),한명수(M. S. Han),손병영(B. Y. Son) 한국해양공학회 1991 韓國海洋工學會誌 Vol.5 No.1
In this paper, the fatigue strength and the fatigue crack propagation behaviors of the round bar specimens which were spirally built up by welding and subsequently hardened by quenching were investigated. The material used was SF60 which was widely employed in mechanical components, especially shafts. Fatigue tests were conducted at the fully reversed condition(R=-1) and axial and load control in the room temperature and air environment. The experimental results were expressed by both the range of stress intensity factor(ΔK) and the effective range of stress intensity factor(ΔK<SUB>eff</SUB>). It was clarified that applying of quenching after the building up welding process improved the fatigue strength and the fatigue crack propagation property in the low range of ΔK of the built up round bar specimen.