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산란 후기 사료 내 거미(Nephila clavata) 유래 단백질 분해효소제(Arazyme<SUP>Ⓡ</SUP>)의 첨가 급여가 난 생산성에 미치는 영향
김정언(J. U. Kim),김재영(J. Y. Kim),김지숙(J. S. Kim),이보근(B. K. Lee),이소연(S. Y. Lee),이완섭(W. S. Lee),유선종(S. J. You),안병기(B. K. Ahn),김은집(E. J. Kim),박호용(H. Y. Park),손광희(K. H. Son),신동하(D. H. Shin),강창원(C. W. Kang) 한국가금학회 2009 韓國家禽學會誌 Vol.36 No.1
강정진(J. J. Kang),김정언(J. E. Kim),홍석관(S. K. Hong),김종덕(J. D. Kim),허영무(Y. M. Heo),조종두(C. Cho) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
Ultra-thin sheet metal forming techniques are required in precision forming of miniaturized and integrated products. In order to manufacture a good quality and low cost ultra-thin sheet metal products, a highly precise high-speed press is needed. The precision of a press is related with its vibration characteristics during pressing operation. This study evaluated the vibration characteristics of a proposed press design using computer simulation. The analysis compares the static deformation characteristics of the slide and the slide motion for the metal forming of an ultra-thin sheet of thickness less than 0.1mm. Further, in order to minimize the vibrations during high speed pressing operation, revolution balances of the eccentric shaft and the balance weight device is also considered. Finally, modal analysis is used to characterize the natural frequency of vibration of the press.