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한우 육증산을 위한 비육촉진제에 관한 연구 3 보 . Monensin 첨가가 한우큰소 비육의 비육능력 및 제 1 위내성상에 미치는 영향
이학철,정근기,손제영,서영석,임경순,함태수 ( H . C . Lee,K . K . Jung,J . Y . Son,Y . S . Sye,K . S . Lim,T . S . Ham ) 한국축산학회 1980 한국축산학회지 Vol.22 No.5
The pervious studies evidenced the marked effects of monensin on feedlot performance of growing-finishing male cattle. Thus, the effects of monesin on feedlot performance of finishing bulls with initial body weight of over 300 ㎏ in Korean native cattle were studied, and also volatile fatty acids production in the rumen was observed. Eight bulls of Korean native cattle averaging 318.7 ㎏ were randomly divided into two groups of four animals for 161-day experiment. The bulls were fed ad libitum rations containing monensin at 0 or 30 ppm with rice straw as roughage. The rice straw was cut to length of 3-5㎝ and mixed with the concentrates at the rate of 10%. Average daily gain, concentrate consumption, and concentrate conversion were 1.05, 9.00, 8.55 ㎏ for the control group and 1.20, 9.13, 7.5 ㎏ for the monensin group, respectively. Monesin improved daily gain by 14.3% and concernrate conversion by 11.2%. Also, monensin made an improvement of 10.6% and 11.4% in DCP and TDN per ㎏ gain, respectively. Ruminal pH and total VFA concentration were not largely changed by monensin, but monensin group tended to slightly increased the total VFA concentration. Molar percent of propionate was significantly increased (p$lt;.01). As a result, acetate to propionate ratio was greatly decreased (p$lt;.01). Monensin did not influence carcass characteristics, but monensin group tended to have lower dressing percent. Rumen parakeratosis, abomasum erosion and ulcer were observed in the control and the monensin groups. However, the control group showed more pathological changes including abomasum hemorrhage and urinary calculi in the bladder than the monensin group. These results suggest that monensin is valuable to increase beef production of Korean native cattle.
윤곽제어 및 위치추종 성능을 고려한 3축 연동제어 시스템 설계
이학철(H. Lee),지성철(S. Jee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
This paper proposes a controller design analysis for three-axis CNC systems considering both contouring and tracking performance. The proposed analysis inclusively combines axial controllers for each individual feed drive system together with cross-coupling controller at the beginning design stage as an integrated manner. These two controllers used to be separately designed and analyzed since they have different control objectives. The proposed scheme includes a stability analysis for the overall control system and a performance analysis in terms of contouring and tracking accuracy. Computer simulation is performed and the results show the validity of the proposed methodology.