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박창순(C-S Park),송삼삼(S-s Song),이현장(H-j Lee),이종준(J-J Lee),홍성현(S-H Hong),조현무(H-M Jo) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
In recent Year were many devices and facilities developed and manufactured. For guarantee of the property of the devices and facilities needs Vibration protecting Technique and the Technique will be developed more and more. Magneto-Rheological damper is one of the nice devices for reducing of Vibration. In this paper magnetic properties of a MR-damper which is developed for reducing of vibration in display manufacture devices will be analysed at variation different air-gap length and current.
허용학(Y.-H Huh),김동진(D.J. Kim),이해무(H.M. Lee),홍성구(S.G. Hong),박준협(J.H. Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Fatigue limit of the copper film coated by Sn was estimated by using Goodman diagram and Gerber diagram. To obtain the high cycle fatigue life S-N curve of the film, the high cycle fatigue test was carried out by applying the constant amplitude load to the film specimen with three different stress ratio of 0.1, 0.3 and 0.5 and the frequency of 40 ㎐ at room temperature in air. The film specimen 15.26㎛ thick was fabricated by etching process. The fatigue limits and S-N curves at the respective stress ratios were determined from the experimental works. It was shown that the S-N curves were dependent on the stress ratio and the fatigue limit was increased with decreasing the stress ratio. The dependency of the fatigue behavior was presented in empirical relationship. Using these relationships, the fatigue limit was predicted.
보리 총제담근먹이 급여가 거세한우의 발육 , 사료이용성 및 육질에 미치는 영향
홍성구,조원모,이종문,윤상기,조영무,정의수 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.2
This study was conducted to investigate the effect of feeding whole crop barley silage(WBC) on growth performance, feed efficiency and meat quality in Hanwoo steers. Forty steers were allocated to control(C) which was fed rice straw overall periods and four treatment groups(T₁- T₄) which were fed both WBC and rice straw ad libitum according to the treatments and allowed free access to water. Concentrates were fed at 1.5% level of live body weight during 4-12 months of age, at 1.8% level of live body weight during 13-18 months and ad libitum after 19 months. The results obtained were as follows : The daily gain of control (C) was lower (0.7㎏) than that of treatment group (0.8㎏) and the concentrate intake per ㎏ gain during experimental periods in control (C) was higher than those of treatments, also dry matter basis obtained the same results. Cold carcass weight in Control was lower than those of other treatments except T₄, especially was lower than T₂(p $lt; .05) but fat percentages in T₂was higher. Beef quality and yield traits of steers in T₂was higher than those of treatments. Therefore WBC as roughage has effect on steer feeding system for improving meat grade and growth.