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- 저자 : Dong-Ho Bae(배동호) (검색결과 95 건)
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음식찌꺼기의 발효사료화시 수분조절제와 발효방법이 화학적 조성분 및 소화율에 미치는 영향
배동호,Bae, Dong-Ho 유기성자원학회 2000 유기물자원화 Vol.8 No.4
음식찌꺼기의 사료화를 위한 발효처리시 수분조절제로 이용되는 재료 (톱밥, 버섯폐재, 밀기울, 야자박 등)와 발효방법 (호기성파 혐기성)및 발효기간이 음식찌꺼기 사료의 사료가치에 미치는 영향을 구명하기 위한 일련의 시험을 실시하였다. 본 연구의 시험설계는 농가 지도자료로 활용 될 수 있도록 하였다. 참나무 톱밥과 소나무 톱밥의 NDF(중성세제 불용성 섬유)함량은 각각 건물기준 93.5%와 95.4%로써 사료로 이용하기는 어려운 재료라고 할 수 있다. 톱밥을 수분조절제로 50% 혼합하여 $30^{\circ}C$에서 2일간 호기성발효를 했을때 NDF 함량은 발효 전 재료에 비하여 12% 증가했고 in vitro DDM (인공반추위 건물소화율)은 48% 감소했다. 참나무 톱밥은 소나무 톱밥에 비하여 양호하였으며, 버드나무 톱밥(80%)과 밀기울(20%)을 혼합하여 팽이버섯재배의 배지로 이용된 후의 폐재는 톱밥류에 비하여 사료가치가 우수한 것으로 나타났다. 발효된 사료의 NDF함량과 건물소화율은 이용된 수분조절제의 NDF함량에 주로 관계된다는 것을 알 수 있었다. 버섯폐재를 밀기울로 대체 했을때 밀기울의 대체율이 증가함에 따라 발효된 사료의 NDF함량은 직선적으로 감소했고 소화율은 직선적으로 증가했다. NDF함량이 높은 수분조절제를 이용한 호기성발효는 발효기간이 길어질수록 NDF함량은 증가되었고 건물소화율은 감소되었다. 그러나 밀기울 만을 이용하거나 밀기울이 함유된 수분조절제는 발효기간이 연장됨에 따라 조단백질 함량이 증가되었다. 혐기성발효는 호기성 발효에 비해 전 처리구에서 NDF함량은 감소되었고 건물소화율은 향상되었다. 버섯폐재와 밀기울을 수분조절제로 이용하여 실온에서 30일간 혐기적으로 발효한 사료를 유기산 조성과 pH가를 기준으로 발효상태를 판정할 때 우수한 것으로 나타났다. Studies were conducted to know effects of the bulking agents (saw dusts, mushroom waste, wheat bran coconut meal, rice hulls) adding o moisture control, fermentation methods (aerobic and anaerobic) and periods (1 to 20 days) of food waste fermentation for animal feeds on chemical compositions and in vitro DDM (digestibility of dry matter). Experiment designs were focussed basically to obtain extension service data. The NDF (neutral detergent fiber) composition in the oak and pine saw dust were 93.5% and 95.4% (DM basis) in respectively. Thus, the fermented food waste feeds using saw dust (50%) increased NDF(12%), and decreased in vitro DDM(48%) compared to those of raw materials before aerobic fermentation. The oak saw dust showed higher DDM compared to pine. Mushroom wastes which is a residues of mushroom culture mixed originally willow saw dust (80%) and wheat bran (20%) showed quite higher feed value compared to both saw dusts. It was found that an in vitro DDM and NDF composition in fermented feeds appeared highly dependent or the NDF composition in bulking agents. With an increase wheat bran ratio substitute mushroom waste showed linearly decreased NDF, and increased in vitro DDM in the fermented food waste feeds. The fermented feeds added bottling agents composed higher NDF resulted in higher NDF and lower in vitro DDM with prolonged fermentation time. The feeds from anaerobic fermentation appeared lower NDF and higher in vitro DDM compared to those of aerobic fermentation.
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배동호,J . G . 웰츠 ( Dong Ho Bae,James G . Welch ) 한국축산학회 1979 한국축산학회지 Vol.21 No.6
Transplanted Miscanthus sinessis was studied for the evaluation of nutritive value in relation to the stage of maturity. Plants were cut at eight stages of maturity beginning on June 9, and at ten-day intervals until August 23. The dry matter content of the plant was approximately constant until July 19, which was the early boot stage, and increased rapidly until August 23. The protein content decreased uniformly with each delay in cutting until July 29 which was the prebloom stage, and leveled off until August 23. The protein content until the prebloom stage was similar to that of timothy hay. The CWC and ADF contents increased fast in earlier stages of maturity and leveled off in later stages. While lignification accelerated in later stages of maturity. Until the early bloom stage, the CWC content of Miscanthus sinensis was not high compared to other grass hays. But after the midbloom stages, it was the same or a little higher `than coastal Bermuda grass pellets. A linear relationship (Y=-0.473x+94.3, R²= 0.986) between the in vitro DDM (Y) and cutting date (x) was found. The DDM declined at a rate of 0.47% per day for each day`s delay in harvesting after June There was no relationship between calcium and phosphorous content and cutting date. The average calcium content was lower than in the early bloom stage of timothy hay, and phosphorous content was similar to that of timothy hay.
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음식찌꺼기의 발효사료화시 수분조절제와 발효방법이 화확적 조성분 및 소화율에 미치는 영향
배동호(Dong-Ho Bae) 유기성자원학회 2000 유기물자원화 Vol.8 No.4
Studies were conducted to know effects of the bulking agents (saw dusts, mushroom waste, wheat bran coconut meal, rice hulls) adding as moisture control, fermentaåon methods (aerobic and anaerobic) and periods (1 to 20 days) of food waste fermentation for animal feeds on chemica1 compositions and in vitro DDM (digestibili ry of dry matter). Experiment designs were focussed basica11y to obtain extension seπice data. The NDF (neutral detergent fìber) composirion in the oak and pine saw dusr were 93.5% and 95.4% (DM basis) in respectively. Thus, the fermented food waste feeds using saw dusr (50%) increased NDF(l 2%), and decreased in vitro DDM(48%) compared to those of raw materials before aerobic fermentaåon. The oak saw dust showed higher DDM compared to pine. Mushroom wastes which is a residues of mushroom culture mixed originally willow saw dust (80%) and wheat bran (20%) showed quite higher feed va1ue compared to both saw dusts. It was found that an in vitro DDM and NDF composition in fermented feeds appeared highly dependent on the NDF composition in bulking agenrs‘ With an increase wheat bran ratio subsårute musruoom waste showed linearly decreased NDF, and increased in vitro DDM in the fermenred food waste feeds. The fermenred feeds added bulking agenrs composed higher NDF resulted in higher NDF and lower in vitro DDM with prolonged fermentation time. The feeds ftom anaerobic fermenration appeared lower NDF and higher in vitro DDM compared to those of aerobic fermentation.
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[論文] 인장-전단하중을 받는 일점 Spot용접재의 파괴역학적 피로강도 평가
배동호(Dong Ho Bae) 한국자동차공학회 1991 오토저널 Vol.13 No.5
According as the members and inner and outer plates of the automobile body structure have been thinned their thickness and have become high strength, each part of the body structure has been put more severe stress condition.<br/> Therefore, it has been increasingly required to improve the fatigue strength of the spot welded structures. As one of the improving methods for such problem, the author had previously proposed the method of alleviating stress concentration at nugget edge of the spot weld part and improving its fatigue strength [1]. But, because fatigue strength of the spot welded lap joint is influenced by its geometrical and mechanical factors, welding condition and etc., there needs a quantitative and systematic estimation method of them.<br/> In this report, by considering nugget edge of the spot weld part of the spot welded lap joint subjected to tensile load to the ligament crack, fatigue strength of various spot welded lap joints was estimated with the stress intensity factor (S.I.F.) K which is fracture mechanical parameter.<br/> It is known that evaluation of fatigue strength of the spot welded lap joint by the stress intensity factor (S.I.F.) K is more effective than the maximum stress (σ_ymax) at edge of the spot weld part on the center line of width of the plate.
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손일선,배동호,홍정균,이범노,Son, Il-Seon,Bae, Dong-Ho,Hong, Jeong-Gyun,Lee, Beom-No 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.3
Because welding residual stress is formidable result in electric resistance spot welding process, and it detrimentally affect to fatigue crack initiation and growth at nugget edge of spot welded la p joints, it should be considered in fatigue analysis. Thus, accurate prediction of residual stress is very important. In this study, nonlinear finite element analysis on welding residual stress generated in process of the spot welding was conducted, and their results were compared with experimental data measured by X-ray diffraction method. By using their results, the maximum principal stress considered welding residual stress at nugget edge of the spot welded lap joint subjected to tension-shear load was calculated by superposition method. And, the $\Delta$P- $N_f$ relations obtained through fatigue, tests on the IB-type spot welded lap joints was systematically rearranged with the maximum principal stress considered welding residual stress. From the results, it was found th2at fatigue strength of the IB-type spot welded lap joints could be systematically and more reasonably rearranged by the maximum principal stress($\sigma$1max-res considered welding residual stress at nugget edge of the spot welding point.
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