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돼지에 있어 산자수 , 동복자생시체중 및 임신기간의 유전력 , 반복력 및 유전상관
백동훈,박영일,오봉국,한성욱 ( D . H . Baik,Y . I . Park,B . K . Ohh,S . W . Han ) 한국축산학회 1974 한국축산학회지 Vol.16 No.2
The heritabilities, repeatabilities, and genetic correlations among litter size, litter weight at birth and gestation length were estimated on the basis of the data obtained from 614 litters (5,547 pigs) of the Landrace raised at the St. Isidore Farm over a 3-year period from the spring of 1969 to the winter of 1971. The effects of the year and season of birth and parity were estimated by the least square method. These estimates were used for the statistical adjustment of the data for the differences in certain environmental factors. The heritabilities and genetic correlations among the traits studied were estimated from the sire components of variance and covariance. The repeatahilities were estimated from the intra-class correlation among repeated measurements of the traits for the same dam. The results obtained are as follows. 1. The estimates of beritabilities were 0.097±0.061 for the total number of pigs born, 0.204±0.107 for the gestation length, 0.124±0.090 for the number of pigs born alive and 0.059±0.065 for the litter weight at birth. 2. The estimates of repeatabilities were 0.136±0.102 for the total number of pigs born, 0.779±0.034 for the gestation length, 0.129±0.099 for the number of pigs born alive, and 0.091±0.148 for the litter weight at birth. 3. The phenotypic correlation of the total number of pigs horn was 0.037 with the gestation length. 0.932 with the number of pigs born alive, and 0.766 with the litter weight ai birth. The phenotypic correlation of the gestation length was 0.175 with the number of pigs born alive and 0.266 with the litter weight at birth. The phenotypic correlation between tile number of pigs born alive and the litter weight at birth was 0.812. 4. The genetic correlation of the total number of pigs born was 0.188 with the gestation length, 0.955 with the number of pigs born alive, and 0.839 with the litter weight at birth. The genetic correlation of the gestation length was 0.128 with the number of pigs born alive and 0.059 with the later weight at birth. The genetic correlation between the number of pigs born alive and the litter weight at birth was 0.940.
백동훈 한국축산학회 1986 한국축산학회지 Vol.28 No.5
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, or 4) 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-에탄올 혼합연료를 사용하는 SI 엔진의 성능 및 NOx에 관한 연구
백동훈,이수룡 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.5
The effect of gasoline-ethanol blends on performance and NOx emission was investigated in a SI engine with port and direct fuel injection systems. The 1-D cycle simulation program of GT-Power was utilized to analyze the performance of thermodynamic cycle. The results showed that the brake torques are increased with the addition of ethanol to gasoline because of the improvements of volumetric efficiency. The engine with direct ethanol blends injection system has more power than that with port gaoline injection system, which is caused by the higher latent heat of ethanol.
백동훈,황성준,김창성,이용근,조규성,채중규,김종관,최성호,Baik, Dong-Hoon,Hwang, Sung-Joon,Kim, Chang-Sung,Lee, Yong-Keun,Cho, Kyoo-Sung,Chai, Jung-Kiu,Kim, Chong-Kwan,Choi, Seong-Ho The Korean Academy of Periodontoloy 2004 Journal of Periodontal & Implant Science Vol.34 No.1
연구목적 : 이번 실험의 목적은 외과적으로 형성된 성견의 1면 골내낭에 새롭게 제조된, Ca/P 비율이 0.6인 비결정성 calcium phosphate를 적용하였을 때 치주조직의 재생에 미치는 영향을 평가하는 것이다. 연구방법 : 6마리 성견의 양측 하악 제2소구치의 원심면, 제4소구치의 근섬면에 외과적으로 1면 골내낭을 형성하여 치은박리소파술을 시행한 부위를 대조군으로, calcium phosphate만을 이식한 부위를 실험 1군, calcium phosphate와 GTR을 동반한 부위를 실험 2군으로 설정하고 실험하여 술 후 8주에 치유결과를 조직학적으로 관찰하였다. 결론 : 1. 접합상피의 치근단 이동은 대조군에서 결손부 깊이의 30.90 ${\pm}$ 9.92%, 실험 1군에서 결손부 깊이의 24.08 ${\pm}$ 9.12%, 실험 2군에서 결손부 깊이의 38.68 ${\pm}$ 12.22%로 나타났으며 대조군과 실험 1,2군간에 통계적 유의차는 없었다. 2. 결합조직 유착은 대조군에서 결손부 깊이의 36.38 ${\pm}$ 9.03%, 실험 1군에서 결손부 깊이의 26.96 ${\pm}$ 4.24%, 실험 2군에서 결손부 깊이의 27.87 ${\pm}$ 9.70%로 나타났으며 대조군과 실험 1,2군간에 통계적 유의차는 없었다. 3. 신생백악질 형성은 대조군에서 결손부 깊이의 32.92 ${\pm}$ 10.51%, 실험 1군에서 결손부 깊이의 49.16 ${\pm}$ 12.70%, 실험 2군에서 결손부 깊이의 39.62 ${\pm}$ 12.14%로 나타났으며 대조군과 실험 1군간에 통계적 유의차가 있었다. 4. 신생골 형성은 대조군에서 결손부 깊이의 27.24 ${\pm}$ 7.49%, 실험 1군에서 결손부 깊이의 43.51 ${\pm}$ 13.34%, 실험 2군에서 결손부 깊이의 36.47 ${\pm}$ 15.11%로 나타났으며 대조군과 실험 1, 2군간에 통계적 유의차는 없었다. 이상의 결과에서 볼 때, calcium phosphate glasses는 신생골 형성에는 통계적으로 유의차는 없었지만 상당히 증가된 양상을 보였고 신생백악질 형성에는 크게 기여함을 알수 있었다.
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.