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Broiler 사료에 합성아미노산의 첨가효과에 관한 연구 1 . Broiler 초기 사료에 DL - methionine 과 L - lysine 의 첨가효과
김대진,김영길,방극승,최경문,김진성 ( D . J . Kim,Y . K . Kim,K . S . Bang,K . M . Choi,J . S . Kim ) 한국축산학회 1981 한국축산학회지 Vol.23 No.2
The experiment was carried out to investigate the effect of synthetic amino acid to broiler starter with Anak broiler strain. The five treatments in this experiment was that of Control (basal diet:no addition of amino acid), T₁(basal diet+methionine 0.15% and lysine 0.2%), T₂(basal diets methionine 0.3% and lysine 0.4%), T₃(basal diet-methionine 0.15%)and T₄(basal diet-lysine 0.2%) with four replicates. The trial was carried out from 0 week to 4 weeks of age. The results obtained are as follows; 1. The live weight gain of T₁, T₂, T₃, T₄and Control group were 806±2 g, 803±25g, 783±14g, 780±22g, 751±10g respectively and showing no significant difference among treatments. 2. Feed conversion of T₂(1.48) and T₄(1.48) were improved significantly (p$lt;0.05) compared with that of other groups. 3. Energy efficiency ratio of T₄(4.74) and T₂(4.75) were superior by 8-11% to that of control and T₃. 4. Protein efficiency ratio of T₂(2.9) and T₄(3.0) were the highest efficient by approximately 6 -10% compared with that of other groups. 5. In conclusion, the group fed higher methionine and lysine content than the recommendation of NRC feeding standard feed tend to improve for broiler feed conversion, E. E. R. and P. E. R.
김대진(D. J. Kim),석창성(C. S. Seok),서정원(J. W. Seo) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Railway wheelset is the most essential part which undergoes severe cyclic loadings. In recent years, there has been increasing need for insuring the safety of running as the speed of the railway vehicles is getting higher. So it is required on the assessment of fatigue characteristics of the wheelset to consider plastic deformation which might be probable in the severe loading condition. In this study, total-strain controlled low cycle fatigue(LCF) test were performed to observe the LCF behaviors of the railway wheels and axles using companion specimens method. From the experimental results, the cyclic mechanical properties have been evaluated and total strain amplitude versus life relationship have been derived using the empirical Coffin-Manson law.
Pepsin - Cellulase 에 의한 국내산 주요 조사료의 DMD 에 관한 연구 2 . 두과 야초의 세포벽 구성물질과 건물소화율
김대진(D . J . Kim),김영길(Y . K . Kim),맹원재(W . J . Maeng) 한국축산학회 1989 한국축산학회지 Vol.31 No.6
The change of the chemical components and dry matter digestibilities of wild legumes(Cassia minosoides, Vicia angustifolia, Robinia pseudo acacia, Lespedeza bicolor, Pureria thunbergiana) grown in the mountainous area, Kyungsangnam-do province was determined by the advanced stage of maturity. Samples were dried at 70℃ for 24hr. and ground to pass a l-mm screen. Samples were subjected to the determination of the crude protein (N×6.25), crude ash, neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), and dry matter digestibility (DMD) by pepsin-cellulase technique. The energy values (total digestible nutrients, TDN; digestible energy, DE; metabolizable energy, ME) were calculated by DMD of pepsin-cell ulase technique. The results obtained were as follows: 1. The crude protein of wild legumes were ranged 17.49%∼25.74% and the crude protein had a tendency to decrease by advanced stage of maturity. 2. The crude ash of wild legumes were ranged 5.24%∼l0.l8% and the crude ash was not differentiated by advanced stage of maturity. 3. The NDF of wild legumes were ranged 51.94%∼58-97% and the NDF was increased by advanced stage of maturity (p $lt;0.05). 4. The ADF of wild legumes were ranged 30.64%∼39.95% and the ADF was increased by advanced stage of maturity (p$lt;0.05). 5. The ADL of wild legumes were ranged 7.24%∼14.63% and the ADL was increased by advanced stage of maturity (p$lt;0.05). 6. The DMD of wild legumes were ranged 44.48%∼61.80% and the DMD was decreased by advanced stage of maturity (p$lt;0.05). 7. The calculated energy (TDN, DE, and ME) values of wild legumes were decreased by advanced stage of maturity. 8. Regression equation and correlation coefficient of wild legumes between ADL(Y) and crude protein(X) were Y=-0.271X+15.626, and r=-0.559(p$lt;0.01), and of wild legumes between DMD(Y) and ADL(X) were Y=-2.494X+77.912 and r=-0.618(p$lt;0.01), respectively.
김대진(D. J. Kim),위우택(W. T. We),석창성(C. S. Seok),이근호(G. H. Lee),민제홍(J. H. Min) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
To estimate the fatigue life of flange-shaft assembly, fatigue test for flange material and bending fatigue test for flange-shaft assembly were conducted. Also, finite element analysis for flange-shaft assembly was conducted. Then, we have changed the obtained P-N curve to S-N curve using the finite element analysis results which were stress values at the location of fracture. The S-N curve of flange material itself was almost consistent with that of flange-shaft assembly, so it seems that the fatigue life of flange-shaft assembly could be estimated by using S-N curve for flange material and the stress at the location of fracture calculated by finite element methods.
김대진(D. J. Kim),석창성(C. S. Seok),구재민(J. M. Koo),박재실(J. S. Park),서정원(J. W. Seo),구병춘(B. C. Goo) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Under cyclic loading, the fatigue failures of welded joints occur at weld toes which induce stress concentration by weld shape. So we need to obtain the peak stress and the S-N curve to assess the fatigue strength of welded joints. However the measurement of peak stress is of high uncertainty and low reproducibility, so we use nominal stress instead in fatigue tests of welded joints. In this study, fatigue tests to obtain S-N curves am FE analyses to obtain stress concentration factors were conducted for the two types of cruciform fillet welded joints, that is, load-carrying and non load-carrying types. Then we changed the obtained S-N curves to that based on peak stress using the bot-spot stress concept. From the analyses of the S-N curves obtained, we have concluded that there is a need to develop a new method to evaluate the fatigue life.