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오재웅(J. E. Oh),한광희(K. H. Han),손동연(D. Y. Sohn) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
The engine intake system noise has been recognized as a problem for many years. Acoustic design of intake system has trodittionally been a trial and error process. This has resulted in the development of computer based system for acoustic anaysis and acoustic modeling. In this study, we developed the program b::lsed on the tansfer m::ltrix method which analyze and predict the perfomance of intake system noise. By using of this simulation program, we proposed the way to improve for reducing the int::lke system noise. And we verified the improvement by using SYSNOISE and experiment of prototype.
산란계에서 파리 유충의 급여가 계란 품질에 미치는 영향
황보종,이병석,홍의철,배해득,강환구,한광희,장애라,박병성,Hwangbo J.,Lee B. S.,Hong E. C.,Bae H. D.,Kang H. K.,Han K. H.,Jang A. R.,Park B. S. 한국가금학회 2005 韓國家禽學會誌 Vol.32 No.3
This study was conducted to evaluate the ffeding value of dried fly larva (DFL), and the effects of dietary DFL on the performance of laying hens. Ninety laying hens of 43 weeks of age(ISA brown) were randomly allotted to 5dietary treatments (0, 2, 5, 10 and $15\%$ DFL), and fed one of the experimental diets for 8 weeks. The formulae of 5 experimental diets were modified to contain $18.8\%$ CP and 2,900 ME kcal/kg. There were 3 replicates per treatment, and 6 brids Per replicate. No significant difference was found in egg Production among dietary treatments. The egg weight was increased (p<0.05) in DFL treatments compared to the control. Also, the egg shell breaking strength was increased(p<0.05) in DFL treatments by $14\%$ compared to the control. The saturated fatty acid content in egg yolk was decreased by $16\%$, and that of unsaturated fatty acid increased by $7\%$ in DFL treatments. Therefore, it could be suggested that DFL supplementation could improve the egg Qualify by increasing the egg weight, egg shell strength, and unsaturated fatty acid content in egg yolk. 본 연구는 산란계에서 파리 유충의 사료 영양학적 가치를 평가하고, 그 활용 가능성을 검토하고자 실시하였다. 43주령 갈색 산란계(ISA Brown) 총 90수를 51주령까지 8주 동안 각 시험사료 처리구(대조구, 파리 유충 2, 5, 10, $15\%$ 첨가 사료)에 임의배치하여 무제한 급여하면서 사료 섭취량, 산란율, 난황색, 난중, 파란 강도, 난각 두께, Haugh unit, 계란 내 지방산 조성 및 콜레스테롤 함량을 조사하였다. 파리 유충 첨가구가 대조구에 비해서 난중이 유의적으로 높았으며(p<0.05), 파란 강도 증가율은 $14\%$ 높게 나타나 유의적인 차이를 보였다.(p<0.05). 계란 지방산 조성은 파리 유충 첨가구가 대조구에 비해서 포화지방산의 함량은 $16\%$까지 감소되었으나, 불포화 지방산의 함량은 $7\%$까지 유의적으로 높게 나타났다(p<0.05). 이 실험 결과 파리유충이 산란계 사료에 첨가되면 계란의 품질은 개선되었지만 난황에서 포화지방산이 증가비율이 높게 나타났다.
실험 계획법을 이용한 흡기계의 소음 저감 성능 최적화에 관한 연구
박능서(N.S.Park),오재응(J.E.Oh),이규태(K.T.Lee),한광희(K.H.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
The intake noise, a major source of the vehicle noise, was studied to reduce the level of the noise for many years. Traditionally. the intake noise has been analyzed and improved by the experiments, namely, the trial and error approach. The exact anaysis of the intake system is needed to reduce the lovel of the intake noise. So. we developed the performance prediction software of the intake system. In this study. we accomplished research of improving the attenuation performance of the intake system using taguchi method. On the basis of the existing design. we selected factors such as length and radius of the inlet. outlet and manifold that was thought to effect the attenuation performance of the intake system. Factors are arranged by the L18 orthogonal array and simulation is performed by the performance prediction software of the intake system.<br/>