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볏짚의 사료가치 증진을 위한 적정 알카린 H2O2 처리 수준에 관한 연구
문양수(Y . S . Moon),하종규(J . K . Ha),고종열(J . Y . Ko),최연호(Y . H . Choy),조경훈(G . H . Cho),최윤재(Y . J . Choi),한인규(I . K . Han) 한국축산학회 1990 한국축산학회지 Vol.32 No.10
This study was carried out to determine the adequate levels of alkaline hydrogen peroxide treatment for the improvement of nutritive value of rice straw. In vitro digestibility and chemical analysis after several treatments were measured. Treatment variables were soaking time(12, 24, 48 and 96 hrs), temperature(5, 25, 50 and 75℃) of alkaline H₂0₂ solution, H₂0₂ concentration (0.5, 1, 2, 3 and 4%) and substrate /solution ratio (1, 2, 3, 4 and 5g/ml). The results obtained were summarized as follows. 1. The DM digestibilities or rice straw treated with H₂O₂ for 24 and 48 hours were higher than those of the others(p$lt;0.05). There was no differ ences when the rice straw was treated for 12, 72 or 96 hours. Cell wall contents were not affected by the time of treatment. 2. The DM digestibilities were higher at pH 11.5 or above(p$lt;0.05) and was decreased as pH declined. When rice straw was treated with H₂O₂ at pH 11.5 or higher, NDF, ADF and cellulose contents were increased. However, lignin content and DM recovery percentages were decreased. 3. The DM digestibilities were not influenced by the ratio of straw versus liquid. The contents of NDF and cellulose were not affected up to the ratio of 4g rice straw/50m1, but were decreased at 5g rice straw/50m1. Lignin content and DM recovery percentages, however, were increased at 5g rice straw /50m1. 4. The DM digestibilities were not different among treatments at 5, 25 and 50℃. However, the rice straw treated at 75℃ showed lowest digestibility of all treatment (p$lt;0.05). The content of NDF, ADF and cellulose was increased by increasing temperature. However, lignin content and DM recovery percentages were decreased by increasing temperature. 5. The AHP treated rice straw had higher content of ADF and cellulose, and lower content of hemicellulose and lignin as the concentration of H₂O₂, increased. But hemicellulose, lignin and DM recovery percentages were decreased. The NDF content was not different among five different concentrations of H₂0₂ solution. In conculsion, based upon the results of present experiments the most desirable method is to soak rice straw in 1% alkaline H₂0₂ solution at pH 11.5, at room temperatrve (25℃), for 24∼48 hours and at the ratio of 4g rice straw /50m1 solmtion.
최연호,오봉국 ( Y . H . Choi,B . K . Ohh ) 한국축산학회 1983 한국축산학회지 Vol.25 No.6
This study was carried out to present the informations for the optimum age of selection based on partial records to improve egg weight in layers. The data used in this study were the records on 787 White Leghorn hens from two different strains, A and K, which were raised at College of Agriculture, Seoul National University since 1976. The traits analysed in this study were mean egg weights in each period divided into 4 week intervals from first egg and annual mean egg weight in lines A and K. Heritability estimates for mean egg weight in each period from sire component and dam component were; different in appearance in two lines. In line A, the fact that heritability estimates from sire component was higher than those from dam component except for EW 22 suggested the importance of the sex-linkage effect on the inheritance of the traits studied. But the result of line K was shown to be reverse. The heritability estimate for EW 30 that is mean egg weight from 29 weeks to 32 weeks of age was higher than any other periods in line A. In the genetic correlation between. annual mean egg weight and mean egg weights in each period, the coefficient of EW 34 was 0.999 for line A and 0.900 for line K. The figures were highest among all genetic correlation coefficients. Results obtained above suggested that it might be possible to select hens at the period of 33-36 weeks of age to improve egg weight based on early part of the record.
난용종계의 산란능력을 개량하기 위한 초기 산란량의 선발효율에 관한 연구
최연호(Y . H . Choi),오봉국(B . K . Ohh) 한국축산학회 1990 한국축산학회지 Vol.32 No.11
This study was carried out to investigate the selection efficiencies of egg mass for improving egg production using short term records. Data for two layer pure lines, SCWL(single comb white leghorn) and BL (brown layer) which have been maintained at the Mani Breeding Farm were collected from 1980 to 1984 during 3 generations. The mean heritability of early egg mass(EM300) which were estimated from sib-analyses was 0.26∼0.36. Relative selection efficiencies of early egg number(EN300) to percent egg production(EP300) and egg mass(EM300) were estimated in order to investigate the effectiveness of the selected trait, EN300. It was seen that selection for egg numbers should increase total egg production by the shortening of age of maturity, while selection for percent production should increase total egg production more than it would decrease age at maturity. But it was concluded that the most influential trait for improvement of total ability of egg production including egg weight for whole producing periods was egg mass to 300 days of age, EM300.
자동차 동력전달용 하이포이드 기어의 예비성형체 선정을 위한 해석적 연구
김대원(D. W. Kim),박원규(W. G. Park),최연호(Y. H. Choi),이영선(Y. S. Lee),최호준(H.J.Choi),윤덕재(D.J.Yun),임성주(S.J.Lim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
A hypoid gear is a major component of the transmission of automobiles. The gear is required to have good mechanical properties such as high wear resistance and high strength. Generally, a mechanical machining is applied to make the hypoid gear in order to obtain high shape accuracy. However, a warm forging process should be applied for the manufacture of the hypoid gear to manufacture the gear with better mechanical properties than the machining process. In this study, a warm forging process of the gear is studied to determine the design of perform which can make a hypoid gear with no flash and also minimize the forming load and stresses on the die. By finite element analysis of the process, we can obtain the optimum design of the hypoid gear for the warm forging process.
S. W. Han(韓成郁),B. K. Ohh(吳鳳國),M. Y. Lee(李文演),Y. H. Choi(李正九崔然皓) 한국육종학회 1981 한국육종학회지 Vol.13 No.3
Three commercial breeders of broiler were crossed in a 3×3 diallel to estimate combining ability and to find superior mating system. Total 1,181 progenies measured for 2, 4, 6, and 8 week body weight. Compared with pure strains, crossbred consistently showed heterosis in fertility, hatchability, early body weight and feed efficiency. General and specific combining ability and reciprocal effect all were highly significant for measures of body weight except at 2 weeks of age, while those was significant for feed efficiency only at 2 weeks of age. Superior mating systems were AB, BA and crosses.