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白東勳 全北大學校 附設 畜産開發硏究所 1987 畜産開發硏究報告 Vol.1 No.-
Genetic improvement of farm animal requires that objectives be defined clearly for specific production resources. The objectives could be to change the physiological function to fitting low cost of production or to gain benefits from genetic and environmental changes. Strategies to meet the objectives could be: 1) selection among existing populations,2) direct selection when suitable populations are chosen and objectives are properly defined,3) hybridization when traits show heterosis or progress is slow, or4) creation of biologically diverse lines. Merits of new genetic material must be evaluated in environments for which it will be adapted. The physiological functions should be understood for the characteristics we wish to change but can not be measured at young ages, in live animals or in both sexes. The production systems should be evaluated in terms of integrated production efficiency to derive meaningful progress.
가솔린 직접분사엔진에서 EGR량에 따른 연비향상에 관한 연구
백동훈,이수룡 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.1
The effect of EGR on fuel economy was investigated in a gasoline direct injection engine. The 1-D cycle simulation program of GT-Power was utilized to evaluate fuel consumption rate. At high load, fuel consumption increased by about 2~6% according to EGR rate. Knock mitigation was the main effects, gaining about 80% of the total fuel consumption improvement. At low load, fuel consumption reduction was 0.6~2%, which was much lower than that for high load. The lower improvement of fuel consumption at low load is attributed to solely dilution and chemical effects of exhaust gas.
한우의 경제형질에 관한 연구 1 . 출생년도 및 계절의 영향
백동훈,신원집,나승환,정연후 ( D . H . Baik,W . J . Shin,S . H . Na,Y . H . Chung ) 한국축산학회 1985 한국축산학회지 Vol.27 No.7
Data obtained from the total of 683 calves (351 males and 332 females) were analyzed to study differences in economically important traits of Korean native cattle among years and seasons of birth. The calves were born in the Alpine Experiment Station from 1970 to 1983 and reared to 24 months of age for the progeny test of their sires. Average weights were 24.5, 86.7, 117.0, 239.6 and 320.7 ㎏ at birth, 4, 6, 12 and 18 months of age, respectively. Year of birth was an important source of variation for all of the traits studied. The body weights were getting heavier as the year of birth elapsed except for the years 1977, 1978 and 1979. Digestible CP and TDN were varying over the years. Season of birth was a significant source of variation for the weights at birth and 4 months of age but for the weights at 6, 12 and 18 months of age, it failed to show significance. Calves born in fall had lightest weights at all of the age periods classified in this study. The CP and TDN consumption showed to have higher in spring and winter born calves.
Iso-Octane/공기 혼합기에서 수증기 첨가가 점화지연시간에 미치는 영향
백동훈,이수룡 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.5
The effect of water vapor addition on the ignition delay of iso-octane/air mixture was numerically investigated with detailed chemical reaction mechanism. The Chemkin-III was utilized to evaluate the delay time of autoignition for isobaric conditions. By dilution effect and thermal effect, water vapor addition increases the ignition delay time. However, the chemical effect by adding water vapor makes the ignition delay shortened. The ignition delay by the chemical effect is reduced by two ways. Dissociation of water vapor increases the quantities of OH and H. One way is that OH directly makes the rate of iso-octane oxidation reaction 2 increase. The other is that HO2 is produced more by three-body reaction, H+O2+M →HO 2+M, which makes the rate of iso-octane oxidation reaction 3 increase. All trends of three effects are similar according to water vapor addition.
백동훈 제주대학교 농과대학 제주도축산문제연구소 1987 畜産論叢 Vol.2 No.1
Economically important traits in beef and Korean native cattle are defined and several exotic beef breeds are evaluated for those traits. To choose breeds or crosses for beef production, we need to consider economic traits according to the production systems, feed resources available and market requirements. The economically important traits are growth rates, weights at weaning and slaughter, reproductive performances and carcass quality and they need to be standardized to measure. The breeds with high growth rate tend to be good in feed efficiency but poor in reproductive performances. Charolais is excellent in pre- and post-weaning growth and shows very high incidence of dystocia in both pure - and cross-breds. Angus produces top quality carcass. Brahman and Santa Gertrudis stand against harsh environment and resist external parasite like ticks and flies. Male calves of Holstein show faster growth but need to be assessed for the improvement in carcass quality infuture. For Korean native cattle. we need to improve growth rate, milk for nursing calf and quality and quantity of carcass.