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조사료와 농후사료의 급여비율이 한우 거세우의 성장 및 도체특성에 미치는 영향
안병홍,송성철,류재숙 한국동물자원과학회 2002 한국축산학회지 Vol.44 No.6
한우 거세우에게 육성기, 비육전기와 비육후기별로 조사료의 급여수준을 달리하여(35∼11%, 44∼12%, 53∼13%) 비육하였을 때 이들 급여수준이 증체량 및 도체특성에 미치는 영향을 조사하여 농후사료와 조사료의 적정 급여수준을 규명하고저 본 시험을 수행하였다. 한우 거세우의 농후사료 섭취량은 체중 450㎏까지는 체중의 1.8%∼1.9% 수준까지 서서히 증가하다가 450㎏ 이후부터는 감소하였고 조사료 섭취량은 체중 300㎏까지는 체중의 1.04∼1.44% 수준까지 증가하다가 300㎏ 이후부터는 감소하였다. 근내지방도 및 육질등급은 육성기때 조사료 44% 급여구가 다른 급여구에 비하여 높게 나타는 경향이었고 등지방두께는 얇았다. 그러므로 한우 거세우 비육시 조사료 급여수준은 육성기때 44% 수준으로 급여하는 것이 35%나 53% 수준으로 급여하는 것보다 바람직하다고 사료된다. This experiment was carried out to investigate the effects of proportion of concentrates and roughages on growth and carcass traits of Hanwoo steers. Concentrates and roughages were allotted three levels of 35 to 11%, 44 TO 12% and 53 to 13%, respectively from the growing period to finishing period. Concentrate and roughage intake of Hanwoo steers were increased progressively until body weight reached 450㎏ and 300㎏, respectively and reached 1.8 to 1.9% and 1.04 to 1.44% to body weight, respectively but thereafter were decreased gradually. Marbling score and beef grade were tended to be increased when steers were fed 44% roughage compared with the steers fed 35% or 53% at the growing period. Therefore, it can be concluded that feeding 44% of roughage is desirable rather than feeding 35% or 53% of roughage when steers are fattening.
조사료의 급여수준이 한우 거세우의 성장 및 육질에 미치는 영향
안병홍,안동원,류재숙,강효봉,정정수 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.5
Fifteen Hanwoo steers aged about 6 months and weighing about 180kg were randomly allotted into one of three levels(40-11%, 45-13% and 50-15%) of roughage from growing period to investigate the effects of levels of roughage on body gain, carcass grade, blood components and economic analysis of Hanwoo steers. These levels of roughage were manipulated at an interval of 50kg body weight untill body weight reached about 600kg. Steers fed 40-11% or 45-13% roughage did not differ in daily body gain but steers fed 50-15% roughage were significantly(p$lt;0.05) lower in daily body gain than steers fed 40-11% or 45-13% roughage. However, the ribeye area, marbling score, backfat thickness, beef color and fat color were not affected by the levels of roughage. Beef grade tended to improve with increasing levels of roughage in the ration. Blood components such as triglyceride and cholesterol were not affected by the levels of roughage. Steers offered 45-13% roughage during the growing period were the most profitable in economical analysis. Therefore, according to this study it can be concluded that feeding 45-13% roughage from the growing period to finishing period is desirable for Hanwoo steers which will be fattened untill they reach 600kg body weight.
Park, H J,Park, M,Han, M,Nam, B H,Koh, K N,Im, H J,Lee, J W,Chung, N-G,Cho, B,Kim, H-K,Yoo, K H,Koo, H H,Kang, H J,Shin, H Y,Ahn, H S,Lim, Y T,Kook, H,Lyu, C J,Hah, J O,Park, J E,Lim, Y J,Seo, J J Macmillan Publishers Limited 2014 BONE MARROW TRANSPLANTATION -BASINGSTOKE- Vol.49 No.9
The objective of this study was to evaluate the efficacy and safety of micafungin for the prevention of invasive fungal infection (IFI) during the neutropenic phase of allogeneic hematopoietic SCT (allo-HSCT) in children and adolescents. This was a prospective, multicenter, open-label, single-arm study. Micafungin was administered i.v. at a dose of 1 mg/kg/day (max 50 mg) from the beginning of conditioning until neutrophil engraftment. Treatment success was defined as the absence of proven, probable, possible or suspected IFI through to 4 weeks after therapy. From April 2010 to December 2011, 155 patients were enrolled from 11 institutions in Korea, and 147 patients were analyzed. Of the 147 patients, 121 (82.3%) completed the protocol without premature interruption. Of the 132 patients in whom micafungin efficacy could be evaluated, treatment success was achieved in 119 patients (90.2%). There was no proven fungal infection in any patient. The number of patients with probable, possible and suspected IFI was two, two and nine, respectively. Thirty-five patients (23.8%) experienced 109 adverse events (AEs) possibly related to micafungin. No patients experienced grade IV AEs. Two patients (1.4%) discontinued micafungin administration due to adverse effects. None of the deaths were related to the study drug.
Shear Thickening Polishing of Black Lithium Tantalite Substrate
B. H. Lyu,Q. Shao,W. Hang,S. H. Chen,Q. K. He,J. L. Yuan 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.9
To achieve high efficiency in the polishing process to obtain a high surface quality of black LT substrate (a kind of soft brittle material), shear thickening polishing (STP), which is a “gentle” finishing process developed in recent years, was employed in this study. The influence of three key parameters in the STP process including polishing speed, diamond abrasive size and diamond abrasive concentration were analyzed. To investigate the potential mechanical effect of the nanometre abrasive, nano-SiO 2 abrasive particles were added in the slurry, and the concentration of SiO 2 abrasive was also taken as a factor. Taguchi method was utilized to evaluate the influence of the four factors and optimize the polishing conditions. The surface roughness (Ra/Rz) was used as the evaluation index, and the optimized polishing conditions were verified through experiments. Diamond abrasive size has the most significant effect on Ra/Rz, followed by diamond abrasive concentration and then SiO 2 concentration, as the polishing speed has been selected and limited in a small variation rang according to the previous study. Based on the S/N average response analysis, the surface quality is the best under the conditions with 8000# diamond abrasive, 5 wt% diamond abrasive concentration, 90 rpm polishing speed and 10 wt% SiO 2 concentration. After 4 min polishing, the surface roughness Ra/Rz is reduced rapidly from 200.5/1374.6 to 4.2/22.1 nm without embedded abrasive particles on the surface of the black LT substrate. It also shows that the mechanical effect plays a dominant role in the material removal. A certain amount (10 wt% in this study) of nano-SiO 2 can reduce friction between solid colloidal and workpiece, and helps to improve surface quality.
[디젤엔진부문] 디젤산화촉매의 열화에 따른 배기가스특성
이호길(H.K.Lee),강정호(J.H.Kang),이천환(C.H.Lee),김병수(B.S.Kim),류명석(M.S.Lyu),여권구(K.K.Lier),류정인(J.L.Lyu) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Modem diesel vehicle has to comply with the EURO III, IV regulation with very low level of particulate and smoke emission. But diesel engine design technologies are inferior to gasoline engine. Recently, much attention have been focused on diesel exhaust aftertreatment system development. The reducing technologies of exhaust emission for diesel engine classified as common rail, EGR, fuel quality improvement, and development of diesel exhaust aftertreatment. The diesel exhaust aftertreatment technology is considered as the alternative technology in the near future. The diesel exhaust aftertreatment system has been advanced for reducing particulates and emission because it has simple in device structure, relatively low cost and easy to install the vehicle.<br/> In this study it was carried out conversion efficiency test for fresh and aged catalyst. Also it was evaluated the characteristics of exhaust gas and particulate matter emitted from catalyst according to the aging time then particulate matter reduce efficiency due to heat of oxidation reaction at diesel oxidation catalyst(DOC)<br/>
He, H.B.,Li, H.Y.,Lyu, S.K. Elsevier Sequoia [etc.] 2010 Wear: An international journal on the science and Vol.268 No.3
A 20CrMo alloy was implanted with nitrogen ions using plasma source ion implantation (PSII), at a dose range of 1.0x10<SUP>17</SUP> to 6.0x10<SUP>17</SUP>ionscm<SUP>-2</SUP>. Electron Probe Micro-Analysis (EPMA) was used to investigate the depth profile of the implanted layer. Friction and wear tests were carried out on a multi-purpose wear tester. Scanning electron microscopy (SEM) was used to observe the micro-morphology of the worn surface. The results revealed that after being implanted with nitrogen ions, the friction coefficient of the surface layer decreased, and the wear resistance increased with the nitrogen dose. The tribological mechanism was mainly adhesive, and the adhesive wear tended to become weaker oxidative wear with the increase of the nitrogen dose. The effects were mainly attributed to the formation of a hard nitride precipitate and a supersaturated solid solution of nitrogen in the surface layer.