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권상우(S. W. Kwon),정원택(W. T. Jeong),공유식(Y. S. Kong),김영식(Y. S. Kim),김선진(S. J. Kim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Dissimilar friction welding were produced using 15㎜ diameter solid bar in chrome molybedenum steel(KS SCM440) to carbon steel(KS S45C) to investigate their mechanical properties. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, Virkers hardness surveys of the bond of area and HAZ and macrostructure investigations. The specimens were tested as-welded and post-weld heat-treated. The tensile strength of the friction welded steel bars was increased up to 100% of the S45C base metal under the condition of all heating time. Optimal welding conditions were n=2,000(rpm), P₁=60(MPa), P₂=100(MPa), t₁=4(s), t₂=5(s) when the total upset length is 5.4(㎜).
Seroprevalence of equine piroplasms in the Republic of Korea
Seo, M.G.,Yun, S.H.,Choi, S.K.,Cho, G.J.,Park, Y.S.,Kwon, O.D.,Cho, K.H.,Kim, T.H.,Jeong, K.S.,Park, S.J.,Kwon, Y.S.,Kwak, D. Elsevier Scientific Pub. Co 2011 Veterinary parasitology Vol.179 No.1
Equine piroplasms include two tick-borne protozoan parasites, Babesia caballi and Theileria equi. Although no clinical equine piroplasmosis has been reported in the Republic of Korea, the possible existence of the disease has been proposed due to a nationwide distribution of the vector ticks. To determine if the antibodies against B. caballi and T. equi were present, 184 sera of horses (Equus caballus) raised in the Republic of Korea from 2007 to 2010 were assessed using cELISA kits. Two (1.1%) out of 184 sera were positive for T. equi, but none were seropositive for B. caballi. Both samples tested positive came from one region (Gyeonggi province). The accuracy of the cELISA was confirmed by PCR using primers specific to the 18S rRNA of T. equi. This study presents for the first time horses infected by T. equi in the Republic of Korea. Since the infection of T. equi occurred in horses raised in the Republic of Korea, further studies with continuous monitoring of the vector ticks for equine piroplasms and appropriate control programs need to be established.
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.
Kwon, Y.T.,Park, M.S.,Kim, J.D.,Choi, K.Y.,Jung, M.H.,Iyo, A.,Tokiwa, K.,Kim, Y.C.,Lee, S.I. Elsevier 2010 CURRENT APPLIED PHYSICS Vol.10 No.4
By using the Hao-Clem model, we analyzed the equilibrium magnetization of the grain-aligned HgBa<SUB>2</SUB>Ca<SUB>4</SUB>Cu<SUB>5</SUB>O<SUB>12+y</SUB> (Hg1245) with T<SUB>c</SUB>~108K. We obtained thermodynamic parameters, such as the penetration depth [λ<SUB>ab</SUB>(0)] and the coherence length [ξ<SUB>ab</SUB>(0)] from the thermodynamic critical field [H<SUB>c</SUB>] and the Ginzburg-Landau parameter [κ]. Compared to the four layered superconductor HgBa<SUB>2</SUB>Ca<SUB>3</SUB>Cu<SUB>4</SUB>O<SUB>10+y</SUB> (Hg1234), the obtained penetration depth was slightly increased indicating that the Cooper pair density of Hg1245 was decreased, which was one of the reasons why the transition temperature (T<SUB>c</SUB>) of the Hg1245 did not increase as compared to the Hg1234. The expected increase of T<SUB>c</SUB> for the material with the more CuO<SUB>2</SUB> planes was not achieved because of the insufficient doping of the Cooper pairs while adding CuO<SUB>2</SUB> planes.
S.-T. Kwon,C.- S. Cheong,H. Sagong 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.2
Sagong, H., Kwon, S.-T., and Ree, J.-H., 2005, Mesozoic episodicmagmatism in South Korea and its tectonic implication. Tecton-ics, 24, TC5002, doi:10.1029.
Systematic Investigation of Possibilities for New Physics Effects in b →s Penguin Processes
S. Kim, C.,J. Kwon, Y.,Lee, Jake,Yoshikawa, T. Yukawa Institute for Theoretical Physics and the P 2006 Progress of theoretical physics Vol.116 No.1
<P>Although recent experimental results in b →s penguin process seem to be roughly consistent with the standard model predictions, there may be still large possibilities of new physics hiding in these processes. Therefore, here we investigate systematically the potential new physics effects that may appear in time-dependent CP asymmetries of B →φK0, B →η′K0 and B →K0 π0 decay modes, by classifying the cases for the values of the mixing-induced indirect CP asymmetries, SφK0, Sη′K0, SK0 π0 which are compared to SJ/ψK0. We also show that several Bs decay modes may help to resolve the ambiguities in such an analysis. Through combining analysis with the time-dependent CP asymmetries of Bs decay modes such as Bs →φη′, Bs →η' π0 and Bs→K0 overlineK0, we can determine where the new CP phases precisely come from.</P>