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Jung, W.Y.,Yu, S.L.,Seo, D.W.,Jung, K.C.,Cho, I.C.,Lim, H.T.,Jin, D.I.,Lee, Jun-Heon Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.10
Pigs may need to be exploited as xenotransplantation donors due to the shortage of human organs, tissues and cells. Porcine endogenous retroviruses (PERVs) are a significant obstacle to xenotransplantation because they can infect human cells in vitro and have the potential for transmission of unexpected pathogens to humans. In this research, 101 pigs, including four commercial breeds (23 Berkshire, 13 Duroc, 22 Landrace and 14 Yorkshire pigs), one native breed (19 Korean native pigs) and one miniature breed (10 NIH miniature pigs) were used to investigate insertional variations for 11 PERV loci (three PERV-A, six PERV-B and two PERV-C). Over 60% of the pigs harbored one PERV-A (907F8) integration and five PERV-B (B3-3G, B3-7G, 742H1, 1155D9 and 465D1) integrations. However, two PERV-A loci (A1-6C and 1347C1) and one PERV-B locus (B3-7F) were absent in Duroc pigs. Moreover, two PERV-C loci (C2-6C and C4-2G) only existed in Korean native pigs and NIH miniature pigs. The results suggest that PERV insertional variations differ among pig breeds as well as among individuals within a breed. Also, the results presented here can be used for the selection of animals that do not have specific PERV integration for xenotransplantation research.
Low Temperature Oligomerization of Ethylene over Ni/Al-KIT-6 Catalysts
Hwang, A.,Kim, S.,Kwak, G.,Kim, S. K.,Park, H. G.,Kang, S. C.,Jun, K. W.,Kim, Y. T. Springer Science + Business Media 2017 Catalysis letters Vol.147 No.6
<P>In this paper, we have studied the oligomerization of ethylene with a liquid heptane solvent over bifunctional Ni catalysts in a continuous flow reactor. We have prepared an Al-containing KIT-6 silica that was used as a support after calcination in the temperature range of 300-900 A degrees C. The Ni/Al-KIT-6 catalysts had uniform mesopores with diameters in the range of 5.4-6.3 nm, excepting Ni/Al-KIT-6 (900). The calcination temperature of Al-KIT-6 support changed the surface acidity as well as the interaction of Ni2+ and acid sites for the Ni catalysts, as determined by temperature-programmed desorption of ammonia, temperature-programmed reduction, infrared spectroscopy after the adsorption of pyridine, solid-state Al-27 magic-angle spinning nuclear magnetic resonance spectroscopy, and X-ray adsorption spectroscopy. Among the tested catalysts, the Ni/Al-KIT-6 (300) showed the highest ethylene conversion because of the increased intimate contact between Ni2+ and acid sites. The strong interaction of Ni2+ species and the support is not effective in increasing active sites for ethylene conversion. The Ni/Al-KIT-6 catalysts produced internal linear C4 and C6 olefins with high selectivity. The Ni/Al-KIT-6 (300) had 2.2-6.1 times lower selectivities toward 2-ethyl-1-butene than other catalysts at similar ethylene conversions. The reaction product mixture showed that the Ni/Al-KIT-6 catalysts shifted the product distribution towards acid-catalyzed oligomerization/cracking/realkylation products (i.e. C3, C7, C7, and C8+ olefins) as the concentration of Bronsted acid sites increased. Among the tested catalysts, the Ni/Al-KIT-6 (300) showed the highest yield of C4 and C6 olefins (78.3%).</P>
저온에너지 회수용 히트파이프의 작동유체 특성에 관한 연구
전철호(C. H. Jun),장영석(Y. S. Jang),김오근(O. G. Kim),장도원(D. W. Jang),정상욱(S. W. Jung) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
The resources which is limit loses and the research of alternative energy actively is become accomplished. Also the method which uses the waste heat which the wool which it will write comes to think without again is discussed. Also uses fossil fuel and as plentifully to get neither the environment problem against the CO₂ which becomes will be able to think. Being a break with that reason, it used the heat pipe which is heat transfer machine of the high performance and the test research against the method low-density heat-source frequency it did. Low-density heat-source of the entrance it will measure consequently in temperature and the possibility where it will know the use effect of energy it was. Also gave the change of flow and enthusiasm delivery efficiency of heat pipe which made working fluid with the acetone comparison and it will be able to analyze. Against the method which from this time research applies low-density heat-source with alternative energy it will be able to confirm as a numerical value.
주윤하(Y. H. Joo),전철웅(C. W. Jun),이다혜(D. H. Lee),한효주(H. J. Han),안진효(J. H. An),이종민(J. M. Lee),박철우(C. W. Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In the present study, we performed design processes of reciprocating pump to make pulsatile flow for simulation of aortic blood flow in arteries. To design a pulsatile pump, we firstly calculated the pressure for working fluid in a cylinder accurately based on fundamentals of fluid mechanics. According to the pressure expectation, every compartments, such as piston, crank shaft and gear, were designed to overcome plastic deformation. As a result, we evaluated the power requirement effectively for a reciprocating pump motor selection.