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네자리 Schiff Base 전이금속(II) 착물들에 의한 SOCl$_2$의 전기화학적 환원 : 촉매 효과
김우성,최용국,김찬영,조기형,김종순,Woo-Seong Kim,Yong-Kook Choi,Chan-Young Kim,Ki-Hyung Chjo,Jong-Soon Kim 대한화학회 1993 대한화학회지 Vol.37 No.8
Electrochemical reduction of thionyl chloride has been carried out at glassy carbon and molybdenum electrodes, the surface of which is modified by binuclear tetradentate schiff base Co(II), Ni(II),Cu(II) and Fe(II) complexes. The catalyst molecules of transition metal(II) complexes were adsorbed on the electrode surface and reduced thionyl chloride resulting in a generation of oxidized catalyst molecules. There was an optimum concentration for each catalyst compound. The catalytic effects of SOCl$_2$ reduction were larger on glassy carbon electrodes compared to molybdenum electrodes and enhancements in reduction current of up to 120${\%}$ at the glassy carbon electrodes. The reduction currents of thionyl chloride were increased and the reduction potentials were shifted to the negative potential when scan rates became faster. The reduction of thionyl chloride was proceed to diffusion controlled reaction. 이핵성 네자리 schiff base Co(II), Ni(II), Cu(II) alc Fe(II) 착물들을 촉매로 사용하여 몰리브데늄 전극과 유리질 탄소 전극에서 SOCl2의 전기화학적 환원반응을 조사하였다. 이들 전이금속(II) 착물들은 먼저 전극 표면에 흡착된 후 촉매로 작용하였으며, 각각의 전이금속(II) 착물들의 촉매 화합물은 SOCl$_2$ 를 환원시킬 수 있는 최적 조건의 농도를 나타냈다. SOCl$_2$의 환원반응에 대한 촉매 효과는 몰리브데늄 전극에서보다 유리질 탄소전극에서 더 크게 나타났고, 환원 전류는 최고 120% 정도 증가하였다. 주사속도 증가에 따른 SOCl$_2$의 환원 전류는 증가하였고 환원 전위는 음전위쪽으로 이동되었으며, SOCl$_2$의 환원과정은 확산지배적인 반응으로 진행되었다.
김우성,정광일,김신국,전성원,김연희,성용은,최용국,Kim, Woo-Seong,Chung, Kwang-Il,Kim, Shin-Kook,Jeon, Seung-Won,Kim, Yeon-Hee,Sung, Yung-Eun,Choi, Yong-Kook Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.6
Electrocatalytic effects for the reduction of thionyl chloride in $LiAICI_4/SOCl_2$ electrolyte solution containing Schiff base M(II) (M; Co and Fe) complexes are evaluated by determining kinetic parameters with cyclic voltammetry and chronoamperometry at a glassy carbon electrode. The charge transfer process during the reduction of thionyl chloride is affected by the concentration of the catalyst. The catalytic effects are demonstrated from both a shift of the reduction potential for the thionyl chloride toward a more positive direction and an increase in peak currents. Catalytic effects are larger in thionyl chloride solutions containing the binuclear [M(II) $_2$ (TSBP)] complex rather than mononuclear [M(II)(BSDT)] complexes. Significant improvements in the cell performance have been noted in terms of both thermodynamics and activation energy for the thionyl chloride reduction. The activation energy calculated from the Arrhenius plots is 4.5-5.9 kcal/mole at bare glassy carbon electrodes. The activation energy calculated for the catalyst containing solution is 3.3-4.9 kcalmole, depending on whether the temperature is lowered or rasied.
제 1 중족골에 발생한 기괴 방골성 골연골성 증식증: 증례 보고
김우성,정유훈,오상훈,한은미,Kim, Woo-Sung,Jung, Yu-Hun,Oh, Sang-Hun,Han, Eun-Mee 대한근골격종양학회 2014 대한골관절종양학회지 Vol.20 No.2
기괴 방골성 골연골성 증식증(Nora씨 병변)은 드문 발생률을 가진 양성 종양으로 주로 수부 및 족부의 단관골에서 발생하는 것으로 알려져 있으나 중족골에서 발생한 증례가 국내에서 보고된 경우는 매우 드물다. 저자들은 중족골에 발생한 기괴 방골성 골연골성 증식증을 경험하였기에 문헌고찰과 함께 보고한다. Bizarre parosteal osteochondromatous proliferation (Nora's lesion) is a rare benign tumor and known to be primarily occur in the small tubular bone of the hands and feet. However, it is very unusual to be reported that it occurs in metatarsal bone in Korea. Thus, we report this tumor of metatarsal bone including the literature review because we have experienced this example.
DED방식의 적층가공을 통한 금형으로의 응용사례 및 효과
김우성,홍명표,김양곤,서창희,이종원,이성희,성지현,Kim, Woosung,Hong, Myungpyo,Kim, Yanggon,Suh, Chang Hee,Lee, Jongwon,Lee, Sunghee,Sung, Ji Hyun 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.4
Laser aided Direct Metal Tooling(DMT) process is a kind of Additive Manufacturing processes (or 3D-Printing processes), which is developed for using various commercial steel powders such as P20, P21, SUS420, H13, D2 and other non-ferrous metal powders, aluminum alloys, titanium alloys, copper alloys and so on. The DMT process is a versatile process which can be applied to various fields like the mold industry, the medical industry, and the defense industry. Among of them, the application of DMT process to the mold industry is one of the most attractive and practical applications since the conformal cooling channel core of injection molds can be fabricated at the slightly expensive cost by using the hybrid fabrication method of DMT technology compared to the part fabricated with the machining technology. The main objectives of this study are to provide various characteristics of the parts made by DMT process compared to the same parts machined from bulk materials and prove the performance of the injection mold equipped with the conformal cooling channel core which is fabricated by the hybrid method of DMT process.
SOCl$_2$의 전기화학적 환원 : 금속-거대고리 화합물의 촉매효과
김우성,최용국,조기형,Woo-Seong Kim,Yong-Kook Choi,Chjo Ki-Hyung 대한화학회 1993 대한화학회지 Vol.37 No.8
거대고리화합물의 유도체들은 촉매로 사용하여 유리질 탄소전극과 탄소 미소전극에서 SOCl$_2$의 전기화학적 환원반응을 조사하였다. 이들 유도체들은 먼저 전극표면에 흡착된 후 SOCl$_2$를 환원시켰다. 전해질 용액에 전극이 담기는 시간과 촉매들의 농도의 변화는 SOCl$_2$의 환원에 크게 영향을 미쳤다. 유리질 탄소 전극에서 촉매효과에 의한 속도상수는 10배 증가하였고, Power 밀도는 최고 220% 까지 증가하였다. 탄소 미소전극을 사용하여 시간전류법에 의해 얻은 확산계수는 유리질 탄소전극을 사용하여 순환전압전류법에 의해 얻은 결과와 다소 다른 값으로 나타났다. Electrochemical reduction of thionyl chloride has been carried out at glassy carbon and microelectrode that modified by macrocyclic compounds. The catalyst molecules of macrocyclic compounds were adsorbed on the electrode surface and reduced thionyl chloride resulting in a generation of oxidized catalyst molecules. The concentration of catalysts and electrode immersion time were found to affect the catalyst performance strongly. Significant improvements in cell performance have been noted in terms of both exchange rate constants of up to 10 times and power densities of up to 220% at glassy carbon electrode. The diffusion coefficients obtained at carbon microelectrode were slightly different from that determined at glassy carbon electrode.
함치성낭종으로 인해 매복된 치아의 외과 및 교정적 치료를 이용한 맹출: 증례보고
김우성,안경미,손동석,Kim, Woo-Sung,An, Kyoung-Mi,Sohn, Dong-Seok 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.2
Dentigerous cyst is an odontogenic cyst which occurs in unerupted tooth crown. After the crown formation, enamel epithelium remnants surrounded continuously proliferates and it forms effusionfluid cyst and expands due to increased internal osmotic pressure. Treatments of cysts are mainly enucleation, marsupialization and de-compression. When deciding the way of treatment, the age of a patient, the anatomical circumstances, the region of lesion and the size of cyst should be considered. Marsupialization is that some parts of internal cystic wall would be converted into oral mucosa if the cyst is large size and is concerned about neighboring anatomic structure. It can be accompanied by enucleation later and eruption of related tooth can be possible. If there is a limitation of spontaneous tooth eruption, eruption of tooth can be induced by orthodontic apparatus. There were 3 patients had dentigerous cyst and underwent marsupialization, their impacted teeth had preserved and had induced eruption, all showing satisfactory results.
김우성,정유훈,조남익,Kim, Woo-Sung,Jung, Yu-Hoon,Cho, Nam-Ik 대한근골격종양학회 2013 대한골관절종양학회지 Vol.19 No.2
지방종은 흔한 양성 연부 조직 종양이지만 수부에서의 발생은 흔하지 않다. 특히 수부에서 5 cm 이상의 지방종인 거대 지방종은 매우 드물어 전세계적으로 매우 적은 수의 증례만이 발표되었다. 저자들은 수부에 발생하고 조직학적으로 거대 지방종으로 확진 받았던 1례를 경험였기에 문헌고찰과 함께 보고한다. Lipomas are the commonest soft tissue tumor. However, those arsing in the hand are infrequent. Lipomas in the hand that exhibit a size of more than 5 cm call giant lipoma, these are very rare only case reports and small series of this entity have been described. We could experience a case about giant lipoma of the hand which cannot easily contact, we report a case including review of literatures.
레이다 원전계/모의성능 실험실을 이용한 레이다 체계성능 시험 및 분석
김우성,Kim, Woo-Sung 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6
One of the critical items in radar testing is the ability to evaluate the performance of radar systems under real operational environments. But it takes lots of time and cost to operate real targets and analyze the test results due to a large amount of data based on these complicated environments. In this paper, the Radar Simulative T&E Lab. is introduced, and the test and analysis results of the developing radar for predicting the radar system performance are described in the Radar Simulative T&E Lab. This laboratory could be used to test the far-field characteristics of antenna radiation pattern and to perform an effective radar system test and evaluation using a simulative target generator under a low cost repeating test situation.