Electrocatalytic Effects for the Reduction of Thionyl Chloride in $Li/SOCl_2$ Cell Containing Schiff Base Metal(II) Complexes

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.

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.

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.

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.

위험성평가 사례 - 화장지 원지 제조업

김우성,Kim, U-Seong 대한산업안전협회 2010 안전기술 Vol.153 No.-

수면 중 호흡의 조절

김우성,Kim, Woo-Sung 대한수면의학회 1999 수면·정신생리 Vol.6 No.1

Sleep alters both breathing pattern and the ventilatory responses to external stimuli. These changes during sleep permit the development or aggravation of sleep-related hypoxemia in patients with respiratory disease and contribute to the pathogenesis of apneas in patients with the sleep apnea syndrome. Fundamental effects of sleep on the ventilatory control system are 1) removal of wakefulness input to the upper airway leading to the increase in upper airway resistance, 2) loss of wakefulness drive to the respiratory pump, 3) compromise of protective respiratory reflexes, and 4) additional sleep-induced compromise of ventilatory control initiated by reduced functional residual capacity on supine position assumed in sleep, decreased $CO_2$ production during sleep, and increased cerebral blood flow in especially rapid eye movement(REM) sleep. These effects resulted in periodic breathing during unsteady non-rapid eye movement(NREM) sleep even in normal subjects, regular but low ventilation during steady NREM sleep, and irregular breathing during REM sleep. Sleep-induced breathing instabilities are divided due primarily to transient increase in upper airway resistance and those that involve overshoots and undershoots in neural feedback mechanisms regulating the timing and/or amplitude of respiratory output. Following ventilatory overshoots, breathing stability will be maintained if excitatory short-term potentiation is the prevailing influence. On the other hand, apnea and hypopnea will occur if inhibitory mechanisms dominate following the ventilatory overshoot. These inhibitory mechanisms include 1) hypocapnia, 2) inhibitory effect from lung stretch, 3) baroreceptor stimulation, 4) upper airway mechanoreceptor reflexes, 5) central depression by hypoxia, and 6) central system inertia. While the respiratory control system functions well during wakefulness, the control of breathing is commonly disrupted during sleep. These changes in respiratory control resulting in breathing instability during sleep are related with the pathophysiologic mechanisms of obstructive and/or central apnea, and have the therapeutic implications for nocturnal hypoventilation in patients with chronic obstructive pulmonary disease or alveolar hypoventilation syndrome.

실험적 외상성교합시 치근막섬유의 조직화학적 관찰

김우성,Kim, Woo-Sung 대한치과보철학회 1969 대한치과보철학회지 Vol.9 No.1

Occlusal force is a critical factor affecting the condition and structure of the periodontium. When the occlusal forces exceed the physiologic adaptive capacity of the tissues, tissue damage ensues. Such damage is referred to as trauma from occlusion. Excessive pressure causes compression, degeneration and realignment of the periodontal ligament fibers so that they are paralleled perpendicular to the tooth and bone. By inducing excessive occlusal forces with a high amalgam filling on rat's molar, the author observed histologic alterations of the periodontal ligament fibers by means of Hematoxylin-eosin, Van Gieson and Aldenyde fuchsin stainings. The results of the study were observed as follows: 1) The excessive occlusal forces altered arrangement of the collagenous fibers. 2) The arrangement of the oblique fibers showed appreciable differences between the control group and the group subjected to 10 days experimental trauma from occlusion. 3) The realignment of the transseptal fibers was not found. 4) The arrangement of the oblique fibers after 15 days of trauma from occusion was similar to that of 10 days experimental group. 5) The oxytalan fibers were more abundant at the cementum rather than at the alveolar bone. 6) The excessive occlusal forces produced funnel-shaped widening of the oxytalan fibers, which followed wavy course. 7) The oxytalan fibers appeared to be distributed mainly around the middle third of the root rather than that of the apical third of the root during the experimental trauma from occlusion.

회원작품 - 제일증권 사옥

김우성,Kim, U-Seong 대한건축사협회 1995 建築士 Vol.1995 No.5

측방판막술시 수종 약물이 치은 재부착 촉진에 대한 실험적 연구

김우성,손성희,Kim, Woo-Seong,Son, Seong-Heui 대한치주과학회 1981 Journal of Periodontal & Implant Science Vol.11 No.1

수부에 발생한 거대 지방종: 증례 보고

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.