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전재원(J.W.Jeon),김현수(H.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
Dynamic shift characteristics of a metal belt CVT were investigated experimentally. It was observed that shift dynamics of CVT were influenced by supply pressure difference △P of the primary actuator. primary speed. and the speed ratio. Also. it was found that the speed ratio rate of di / dt shows linear relationship between △P at each speed ratio. From the experimental results. an empirical formula for the CVT shift dynamics was obtained. It was seen that simulation results using the empirical formula agrees well with the experimental results.
살붙임 정도 , 분만난이도 및 분만계절이 젖소의 최고비유량과 최고비유량도달일수에 미치는 영향
안병석(B . S . Ahn),상병돈(B . D . Sang),윤문석(M . S . Yoon),전재원(J . W . Jeon),이현준(H . J . Lee),유충현(C . H . Yoo),조윤연(C . Y . Cho) 한국축산학회 1994 한국축산학회지 Vol.36 No.2
To determine the effects of body conditioning score (BCS), calving difficulty (CD) and calving season (FS) on days of peak milk yield (DPM) and peak milk production (PM), the Lactation records of 160 cows in the National Animal Breeding Institute during 1993 were analyzed. Calving season was found to be a significant (p$lt;0.05) influence on peak milk production and days of peak milk yield. DPM was longest for the spring calving season (March to May), but it was shorter for the winter (December to February), summer (June to August) and fall (September to November) calving seasons (in that order). PM was highest in the winter, but showed decreasing values in the spring, summer and fall. CD did not significantly effect DPM and PM, but there was no unitorm tendency shown. BCS did not significantly effect DPM (p$lt;0.05). Cows having a body conditioning score below 3.25 had higher milk yields than those scoring over 3.25.
젖소의 골반입구 크기와 요각폭에 (腰角幅) 대한 산차효과 및 유전력 추정
안병석(B . S . Ahn),상병돈(B . D . Sang),윤문석(M . S . Yun),김재원(J . W . Kim),전재원(J . W . Jeon),조윤연(Y . Y . Cho),박태진(T . J . Park),김내수(N . S . Kim) 한국축산학회 1992 한국축산학회지 Vol.34 No.6
To estimate the effect of parity, and the heritability of the pelvic inlet size and rump width, the data set of 276 heads of dairy cattle were analized. The parity influenced on the pelvic inlet size and rump width (p $lt;.01). The heritabilities of the pelvic inlet size and rump width were .24±.24, .28±.22 by GLM and Harvey, .40±.23, .35±.23 by ML, .43±.23, .38±.23 by REML, .59±.22, .30±.22 by MIVQUE, respectively.