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특징적인 대동맥벽의 기포를 동반한 세균성 대동맥염(Bacterial Aortitis) 1 예
이종구,김재중,송재관,박승정,이근찬,김도하,조재근,장재원,채제건 대한내과학회 1995 대한내과학회지 Vol.49 No.4
Bacterial aortitis is a rare but fatal infectious disease of underlying atherosclerotic aorta or normal aortic wall in immunecompromised host. The most commonly identified organisms are Salmonella and Staphylococcus. Characteristic findings of computed tomography scan are aortic nodularity, aneurysm of irregular configuration and air in the aortic wall. An-eurysmal dilatation of the infected aorta is the usual course, which is commonly associated with rupture. We report a case of bacterial aortitis with characteristic air in the aortic wall which progressed to aneurysmal formation and rupture.
Comparison Study of Oxidation Behavior of Low Carbon Steel at Elevated Temperatures
Ha, Sang An,Kim, Dong Kyun,Lee, Woo Jin,Kang, Chang Yong,Kim, Kwon Hoo,Wang, Jei Pil Trans Tech Publications, Ltd. 2014 Advanced materials research Vol.1025 No.-
<P>Comparison study of oxidation behavior of low carbon steel was conducted at the temperature range of 500°C to 700°C under a 0.2 atm oxygen pressure by continuous and discontinuous oxidation methods. Oxidation rate of both cases was found to be increased with increasing temperature from 500°C to 700°C and obeyed parabolic rate law. In addition, activation energy for the continuous oxidation of steel was found to be a 164.8 kJ/mole, which means that oxidation rate is proportionally dependant on temperature. In case of cyclic oxidation, the oxidation rate was shown to faster than continuous oxidation at all temperatures due to direction oxidation through spallation of the oxide layer.</P>
Ha, Sang An,Jung, Byong Ho,Lee, Jong Moon,Kim, Kwon Hoo,Wang, Jei Pil Trans Tech Publications, Ltd. 2013 Advanced materials research Vol.813 No.-
<P>The objective of this study was to increase flux and decomposition speed through the development of a multi-type electrical field decomposition facility that employs a more complex modulated electromagnetic field than that used in existing decomposition facilities where recalcitrant organics or heavy metals are combined together. Further, in this study, optimized foundational data was derived from the results obtained following field work. As a result, when an electrical field was applied to an electrolyzer, decomposition of the electrolyzer was carried out quickly, thereby showing higher efficiency because an electrical field was permeated to the contaminant faster compared to the case where an electrolyzer was not added. Keywords: Electromagnetic field, Heavy metal, Electrolyzer, Electrical field</P>
EPDM 고무에 Acrylonitrile 과 4 - Chlorostyrene 의 그라프트 공중합
이진국,하창식,조원제,박덕제 한국고무학회 1989 엘라스토머 및 콤포지트 Vol.24 No.2
The radical initiated graft copolymerization of acrylonitrile(AN) and 4-chlorostyrene(4-Clst) onto ethylene-propylene-diene terpolymer(EPDM) rubber was investigated under various conditions. Graft copolymer(AN-EPDM-4-Clst) was isolated by selective solvent, extraction and identified by using IR spectroscopy. The percent grafting is determined as a function of solvent, reaction time, and monomer mole ratio. Percent grafting decreased in the order of tetrahydrofuran(THF)$gt;THF/ethyl acetate(EA)(1:1)$gt;cyclohexane/EA(1:1)$gt;n-hexane/EA(1:1). Grafting increased continuously with increasing the reaction time up to 40 hr, beyond which the grafting levelled off. It was observed that percent grafting increased as increasing [4-Clst]/[AN] mole ratio, but decreased when [4-Clst]/[AN] mole ratio was higher than 1.60. The light resistance of graft copolymer(AN-EPDM-4-Clst) was better than that of ABS.
Ha, Sang An,Kim, Dong Kyun,Lee, Dong Won,Jung, Byong Ho,Lee, Jong Moon,Wang, Jei Pil Trans Tech Publications 2014 Advanced materials research Vol.1025 No.-
<P>The present study is aimed at deriving study factors appropriate for removal of heavy metals in a region with combined contamination of non-biodegradable organics or heavy metal ions in soil or underground water contamination or a region with underground water contamination using a composite alternating current electromagnetic field with combined modulation of an electric and a magnetic field. In addition, it is directed at deriving fundamental experiment, design factors that can be utilized in removing organic contaminants or metal-organic complexes having polarity of an electric charge. The continuous-type apparatus for fusion process in a composite alternating current electric field employed in the present study was designed to process a maximum of 260 L. Each configuration is provided with electrolytic decomposition apparatus, Magnetic Equipment, Power supply and Electrode plates with an adjustable distance between electrodes. By measuring oxidation and reduction processes of ions appearing in chemical reaction processes, electric potentials produced by injection of a negative reactivity electrode into an aqueous solution in a reversible redox equilibrium condition were measured.</P>
Chung, Ildoo,Lee, Chong-Kyo,Ha, Chang-Sik,Cho, Won-Jei Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of polymer science Part A, Polymer chemist Vol.44 No.1
<P>New anti-HIV agents, cyclodextrin–3′-azido-3′-deoxythymidine (CD–AZT) conjugates, were synthesized and characterized. A succinate diester spacer was used to covalently couple 3′-azido-3′-deoxythymidine (AZT) onto cyclodextrin. In addition, their sulfates were prepared by the reaction of CD–AZT conjugates and a sulfur trioxide/pyridine complex at 80 °C. The degree of AZT substitution of the synthesized conjugates and the sulfur contents of their sulfates were calculated from elemental analysis and ranged from 1.3 to 4.7 and from 8.4 to 12.1, respectively. These resulting sulfated conjugates were expected to have a synergistic effect against HIV because of the two anti-HIV active agents (sulfate group and AZT) by the inhibition of virus attachment to cells and that of reverse transcriptase. The in vitro antiviral activity of these conjugates was determined and used to evaluate the potential applications in anti-AIDS drugs. The in vitro anti-HIV activities indicated that the synthesized conjugates and their sulfates against HIV-1 and HIV-2 strains were much better inhibitors than AZT. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 295–303, 2006</P> <B>Graphic Abstract</B> <P>New anti-HIV agents, cyclodextrin–succinate diester–3′-azido-3′-deoxythymidine (CD–AZT) conjugates, were synthesized by molecular design and characterized. Their sulfates were prepared by the reaction of CD–AZT conjugates with a sulfur trioxide/pyridine complex. The in vitro antiviral activities of the conjugates and their sulfates [sulfated cyclodextrin–succinate diester–3′-azido-3′-deoxythymidine (SCD–AZT)] were determined to evaluate the potential applications in anti-HIV drugs. In vitro anti-HIV activities indicated that the synthesized conjugates and their sulfates (SCD–AZT) against HIV-1 and HIV-2 strains were much better inhibitors than 3′-azido-3′-deoxythymidine. <img src='wiley_img/0887624X-2006-44-1-POLA21101-gra001.gif' alt='wiley_img/0887624X-2006-44-1-POLA21101-gra001'> </P>