http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
스템핑 금형의 최적설계를 위한 성형 및 구조 평가에 관한 연구
이종문(J.M.Lee),안병직(B.J.Ahn),이세춘(S.C.Lee),금영탁(Y.T.Keum) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For the optimal design of starnping dies, formabilities during the forming processes and strengths against the forming loads are evaluated by sectional forming analysis program, SH-FORM2, and 3-D structureal analvsis system, IDEAS, In the formability analysis of hood inner panel dies, SH-FORM2 was able to predict the stretch and draw amounts and good agreement between measured and computed thickness strains was obtained. In the structural analysis, IDEAS revealed that stamping dies were designed to have enough stiffness inthe strength, though some parts of upper die, to which impact load is transmitted from the distance block of blank holder, need to be reinforced by the ribs.
젖소에 대한 성장호르몬 ( rbST ) 투여가 유생산 , 유성분 및 호르몬 수준변화에 미치는 영향
이종문(J . M . Lee),최순호(S . H . Choi),김주호(J . H . Kim),임관열(G . Y . Lim),명규호(K . H . Myung),이기종(K . J . Lee) 한국축산학회 1991 한국축산학회지 Vol.33 No.12
Two experiments were conducted to evaluate the effect of recombinantly derived bovine somatotropin (rbST) on milk production, feed efficiency, milk composition and hormones in lactating dairy cows. In daily injection treatment, 15 Holstein cows were allocated to 3 treatments consisted of 0 ㎎/day, 12.5 ㎎/day and 25.0 ㎎/day. The injection of rbST was conducted intramuscularly once a day beginning at day 28 postpartum and continuing for 210 days. In a sustained release treatment, 12 Holstein cows were allocated to 3 treatments consisted of 0 ㎎/2 weeks, 500 ㎎/2 weeks and 750 ㎎/2 weeks of rbST (SR-rbST) injected subcutaneousely once at 2 week intervals beginning at day 254 postpartum and continuing for 28 days. Cows were fed concentrates containing 19.0% CP and 72.4% TDN, and corn silage (30 ㎏/day) throughout the experimental period. The rbST injection (25 ㎎/day) increased 4.0% FCM milk production by 18.0% during treatment period and by 11.7%, compairing with the milk yield of pretreatment period for control cows, while SR-rbST (750 ㎎/2 weeks) injection by 7.0% above control group. There are slightly decreased tendencies in body weight gain after rbST treatments. Milk fat, protein and lactose percentages were slightly highter in rbST treatment groups (12.5 ㎎/day and 25.0 ㎎/day) but did not show statistical difference. However, DM intake of concentrate was increased by 11.0%. showing the highest feed efficiency (㎏ 4.0% FCM/㎏ DM) in 25,0 ㎎/day treatment. Concentration of bST in serum was significantly (P$lt;0.05) higher in rbST treatments (23. 96 and 49.23 ng/㎖) than that of control (15.26 ng/㎖) but milk bST concentration did not differ among treatments (0.32, 0.35 and 0.36 ng/㎖). Furthermore, serum IGF-1 were increased by two-fold with two rbST injection groups (63.53 and 65.60 ng/㎖) although milk IGF-I concentrations were similar for all treatments. Therefore, it could be concluded that rbST and SR-rbST administrations to lactating Holstein cows efficiently improve dairy performances without altering milk composition in a whole and a late lactation period, respectively.
이종문(J.M.Lee),안병직(B.J.Ahn),백경만(K.M.Bak),이세춘(S.C.Lee) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The design methodology and design evaluation of automotive oil pan dies for laminate sheet metal are discussed in this paper, The forming processes and design<br/> characteristics of the dies for laminate sheet matal based on the oil pan are first introduced, Thereafter, the design of the tools is seen with the explanation of auto-design program, which is developed for generating the drawings of die structures associated with 7 forming operation steps.<br/> Next. the design analysis of the tools for pursuing optimal designs. namely. forming analysis and structural analysis, are demonstrated. Sectional forming approach is employed for checking the formability. and elastic 3-dimensional FEM is used for assuring the strength. The design evaluation revealed the uniform stretching over the region and the safe strength of structure.<br/>