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조사료로 볏짚 단사와 볏짚과 청초급여가 한우육성 비육우의 성장에 미치는 영향
안동원,김윤환,안병홍 ( D . W . Ahn,Y . H . Kim,B . H . Ahn ) 한국축산학회 1984 한국축산학회지 Vol.26 No.4
This experiment was conducted to investigate the performance of Korean native bulls fed rice straw and forages or rice straw only as a roughage sources during the growing period of 180 days. The results obtained are summarized as follows: In the body gain, animals fed rice straw and forages and those fed rice straw only had 182.6㎏ and 157.2 ㎏, respectively. Thus, animals fed rice straw and forages are greater than those fed rice straw only. Feed efficiencies are 7.66 for animals fed rice straw and forages and 8.12 for those fed rice straw only. Animals fed rice straw and forages as a roughage sources were better than those fed rice straw only. There are significant differences in the body gain and feed efficiency between treatments (P$lt;0.01). Feed intake was much greater for animals fed rice straw and forages than those fed rice straw only. It can be concluded that forage would increase palatability and obserbed that good roughages are closely related to the feed intake. In the change of body type, the height of hip cross and fore shank circumference were significantly (P$lt;0.01) longer for animals fed rice straw only than those of animals fed rice straw and forages. Rump length was longer for animals fed rice straw and forages than those animals fed rice straw only and there was significant difference between treatments (P$lt;0.05). However, withers height, body length, heart girth, chest width, girth of chest and abdomen, chest width and pin bone width were not statistically significant between treatments.
산란계의 에너지 요구량에 관한 연구 에너지 수준이 산란계의 산란능력 및 품종별 산란능력에 미치는 영향
암병홍,김윤환,안동원 ( B . H . Ahn,Y . H . Kim,D . W . Ahn ) 한국축산학회 1980 한국축산학회지 Vol.22 No.2
To investigate the effect of the dietary energy levels on the laying performance of laying hens and the laying performance by strains of laying hens this experiment was carried out for 350 days from 151 through 500 days of age of laying hens with Chuksi 735. Rhode Island Red X White Leghorn. New Hamp-shire X Rhode Ialand Red and Shaver Isoprotein level(15% crude protein) and 3 levels of dietary energy that is ME 2850㎉/㎏ (energy 100%) 2565㎉/㎏ (energy 90%) and 2280㎉/㎏ (energy 80%) were splited into 5 replication. 4 strains(Chuksi 735, RIF X WL. NH X RIR, Shaver) of laying hen were evenly allocated to a dietary energy level. A total of 600 laying hens were used in this experiment and 50 laying hens were allocated to each strain. The results obtained were as follows. 1. Hen-day egg production rate of energy 100%, 90% and 80% was between 65 and 67% on an average and decreased as the dietary energy levels decreased. However there were no statistical differences between treatments on the hen-day egg production. In the hen-day egg production by strains of laying hen. Shaver produced 73% of egg on the basis of the hen-day egg production and was greatly (P$lt;0.01) highest among the strains of laying hen 67% of Chuksi 735 was next and significant (P$lt;0.01) differences were found out between strains of laying hen. 2. Egg weight from hens on 3 energy levels of 100%, 90% and 80% was 57.5g on an average and was not affected by the energy levels. In the egg weight by strains of laying hen weight of egg produced by Shaver and Chuksi 735 was significant (P$lt;0.05) heavier than that of egg produced by cross strains. 3. Diet intake was progressively decreased as the energy levels increased. Hen fed energy 100% consumed significant (P$lt;0.05) less feed than hens on energy 80%. In the strains of laying hen Shaver and Chuksi 735 of light body weight consumed significant (P$lt;0.01) less feed than cross strains of heavy body weight. 4. Feed required per ㎏ egg production generally was 3.12㎏ to 3.45㎏ and was progressively higher as energy levels decreased. However, there were no significant differences between treatments. In the strains of laying hen, Shaver and Chuksi 735 of light body weight required significant (P$lt;0.01) less feed per ㎏ egg production than cross strains of heavy body weight. 5. In the hen-housed average egg production by strains of laying hen, Shaver produced 247 of egg and was greatly (P $lt;0.01) highest among the strains of laying hen and 231 of egg of Chuksi 735 was next. 6. In the first day of 50% egg production by strains of laying hen, Shaver and Chuksi 735 were slightly (P$lt;0.05)earlier than cross strains of laying hen. 7. In the economical analysis, crude income per hen was lower with hens on high energy level than those on low energy. 8. Therefore according to this experiment, it may be concluded that laying performance was not affected by the dietary metabolizable energy levels between 2565Kcal and 2850Kcal per ㎏ of feed. In the strains of laying hen. Shaver was the highest for the laying performance and next for Chuksi 735.
내연기관 피스톤-링 팩을 통한 실린더 가스 유동의 수치해석
윤정의(J.E.Yun),안동원(D.W.Ahn) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
Cylinder gas flow through a piston-ring pack, blow-by influences the engine performance, the gas pressure acting on the rings which influences the friction and wear characteristics and HC emission. The flow passages consist of ring end gaps, clearances between the ring and the piston groove and nonconforming areas between the ring and the cylinder liner. The gas flow in the clearance between the ring and the groove is directly affected by the axial motion of the ring in the groove.<br/> In this paper the asperity contact force is newly considered in the prediction of the clearance between the ring and the groove surface. This term considerably alleviates divergence property of numerical solution. And it must be taken into account physically in case that the clearance get narrow rather than asperity height between the ring and the groove surface.<br/>
가솔린 엔진의 밸브타이밍 변화가 부분부하 조건에서 잔류가스량 및 연소특성에 미치는 영향
김철수(C.S.Kim),송해박(H.B.Song),이종화(J.H.Lee),유재석(J.S.Yoo),조한승(H.S.CHo),안동원(D.Y.Ahn) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
In-cylinder flow and mixture formation are key contributor to both idle stability and co mbustion stability at part load of automotive engine. The real time measurements of air-f uel ratio and residual gas fraction in cylinder are particularly important to obtain a better understanding of the mechanisms for combustion and emissions, especially during cold sta rt and throttle transient condition.<br/> This paper reports the cycle resolved measurements of residual gas fraction and equivalence ratio near spark plug with cam phasing and its effects on combustion characteristics at part load. The results showed that the effect of intake valve opening on the residual gas fraction was smaller than that of exhaust valve closing because of bumed gas back :low decreases from exhaust port at the same valve overlap. The standard deviation of equivalence ratio near spark plug increased with valve overlap increases and its effect affected the heat release rate, COVimep, etc.<br/>