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Choo, Y.K.,Kwon, H.J.,Oh, S.T.,Kang, C.W.,Kim, H.K.,Hong, E.C.,Heo, K.N.,Lee, S.K.,An, B.K. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.4
There are multiple experiments conducted with male Korean native ducks (KND) to evaluate the optimal levels of limiting amino acids (AA). In Exp. 1, a total of 450 one-d-old male KNDs were divided into five groups with six replicates and fed experimental diets with varying levels of lysine, total sulfur amino acids (TSAA) and threonine (T1, 0.90/0.74/0.70%; T2, 1.00/0.82/0.77%; T3, 1.10/0.90/0.85%; T4, 1.20/0.98/0.93%; T5, 1.30/1.07/1.01%) to 21 d of age. In Exp. 2, one-d-old male KND were received and fed commercial starter diet from hatching to 21 d of age, and then divided into five groups with six replicates and fed one of five diets varying levels of lysine, TSAA, and threonine (T1, 0.73/0.62/0.54%; T2, 0.80/0.68/0.60%; T3, 0.87/0.74/0.65%; T4, 0.94/0.80/0.70%; T5, 1.01/0.86/0.75%) during 22 to 56 d of age, respectively. The BW gain was linearly increased as dietary limiting AA levels increased to 1.20% lysine, 0.98% TSAA and 0.93% threonine. There were no significant differences in feed intake, gain:feed and uniformity among groups. In Exp. 2, the BW gain and gain:feed were not affected by dietary limiting AA levels. There were no significant differences in carcass characteristics and meat quality among groups. The growth performance and carcass characteristics did not show the significant response to increasing dietary limiting AA levels in KND during 22 to 56 d of age. In conclusion, the levels of lysine, TSAA and threonine necessary to maximize growth for starter phase were at least 1.20%, 0.98%, and 0.93%, respectively. On the other hands, KND require relatively low levels of limiting AA for late growth and carcass yield. The dietary levels of 0.73% lysine, 0.62% TSAA and 0.54% threonine appear to be adequate during growing phase.
하성찬(S. C. Heo),서영호(Y. H. Seo),박중원(J. W. Park),구태완(T. W. Ku),송우진(W. J. Song),김정(J. Kim),강범수(B. S. Kang) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Flexible forming process for sheet metal using reconfigurable die is introduced based on numerical simulation. Numerical simulation of sheet metal forming process is carried out by using flexible dies model instead of conventional matched die set. Elastic cushion which has high resilience behavior from excessive deformation are inserted between forming punches and blank material for smoothing the forming surface which has discrete due to characteristics of the flexile die. As an elastic cushion, urethane pads are utilized using hyperelastic material model in the simulation. Formability in view of surface defect such as onset of dimple is compared with regard to various punch sizes. Consequently, it is confirmed that the flexible forming process for sheet material has appropriate capability and feasibility for manufacturing of smoothly curved surface instead of conventional die forming process.
허태원(T.W. Heo),봉상철(S.C. Bong),김정은(C.E. Kim),김동중(D.J. Kim),김돈식(D.S. Kim),오동성(D.S. Oh) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
The power supplies for server application which are satisfied with 80 PLUS GOLD are introduced in this paper. In main AC-DC converter, CCM boost converter using SiC diode is proposed as a PFC converter and phase shift full bridge converter is proposed as a DC-DC converter. Additional sub systems are also introduced in this paper.
예측 전류 제어기법을 사용한 능동 DC 필터 부가형 PFC컨버터에 관한 연구
박성원(S.W Park),허태원(T.W. Heo),신동률(D.R. Shin),배종일(J.I. Bae),안인모(I.M. Ahn),우정인(J.I. Woo) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In this paper, we firstly proposed to the boost type PFC circuit for a power factor improving and a harmonic decreasing. The predict current control method is used to control these PFC circuit This current control method has a merit that is possible to improve power factor and harmonics. In addition, we suggested to the active DC filter, which is connected with the DC output terminal, in order to compensate the DC ripple components. Consequently, these results are proved by the simulation tool, PSIM, which is an exclusive simulator of power electronics.