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익수 후 발생한 흡인성 폐렴에서 유발된 파종성 Scedosporium apiospermum 감염
원호연 ( Ho Youn Won ),김형래 ( Hyung Rae Kim ),김동환 ( Dong Hwan Kim ),오재원 ( Jae Won Oh ),기정혜 ( Jung Hye Ki ),한창훈 ( Chang Hun Han ),이선민 ( Sun Min Lee ),김정주 ( Cheong Ju Kim ) 대한결핵 및 호흡기학회 2010 Tuberculosis and Respiratory Diseases Vol.69 No.4
Scedosporium apiospermum, the anamorph of Pseudallescheria boydii, is a ubiquitous saprophytic fungus. S. apiospermum can cause life-threatening infections usually in immunocompromised patients or after near-drowning incidents. Here, we report the first case of disseminated infection caused by S. apiospermum after near-drowning in Korea. A 44-year-old healthy man developed aspiration pneumonia, followed by multiple brain abscesses, and endopthalmitis, after a near-drowning incident in a septic tank. S. apiospermum infection was diagnosed on the 33rd day after the incident had occurred. The patient died from the progressive renal failure 255 days after incident, although he had been treated with voriconazole.
실리콘으로 제작된 소형 연료 전지에서 가습 조건의 최적화
권오중,원호연,김재정,Kwon, Oh-Joong,Won, Ho-Youn,Kim, Jae-Jeong 한국전기화학회 2007 한국전기화학회지 Vol.10 No.2
연료 전지의 소형화를 위하여 흑연(graphite)를 기본으로 하는 분리판을 실리콘분리판으로 대체하였으며, 실리콘 분리판과 active area가 $4cm^2$인 MEA (membrane electrode assembly)와 결합하여 단위 전지를 제작하였다. 단위 전지에 공급되는 수소와 산소의 공급량은 고정하고 가습기의 구동 온도만을 변화시키면서 단위 전지의 성능을 확인하고 최적의 가습 조건을 결정하였다. 또한 가습 조건이 실리콘으로 제작된 연료 전지 스택에 미치는 영향을 알아보기 위하여 실리콘 분리판과 2개의 MEA로 이루어진 스택을 제작하여 가습 조건의 영향을 알아보고 실리콘 분리판으로 제작된 연료전지 스택의 문제점 및 특징을 알아보았다. Single fuel cell was fabricated with a MEA (membrane electrode assembly) that had a $4cm^2$ active area and with silicon bipolar plates those were introduced to miniaturize the fuel cell by replacing heavy weight graphite plates. Optimum humidification condition for the single cell was selected based on performance results obtained varying humidifier temperature at a fixed feed rate of hydrogen and oxygen. Furthermore, to study the effect of humidification condition on the performance of a fuel cell stack, the fuel cell stack consisting of two MEAs and silicon bipolar plates was studied, then problems and characteristics of silicon-based fuel cell stack were examined.
유성종,임주완,박선하,원호연,성영은,Yoo, Sung-Jong,Lim, Ju-Wan,Park, Sun-Ha,Won, Ho-Youn,Sung, Yung-Eun 한국전기화학회 2007 한국전기화학회지 Vol.10 No.2
[ $Li_+$ ]를 기반으로 하는 비수용액 전해질에서 Prussian blue가 degradation이 없이 구동할 수 있도록 소재를 design하고 제조하여 전기화학적 변색특성을 연구하였다. Prussian blue는 ITO가 코팅되어 있는 유리판위에 일정전류-전착법으로 코팅을 했고, 이 때 사용된 코팅 용액은 $FeCl_3,\;K_3Fe(CN)_6$을 deionized water에 녹이고, HCl, KCl, LiCl을 각각 넣었다. 전기화학적 변색특성을 비교하기 위해 continuous와 pulse potential cycle 하는 동안 transmittance 변화를 in-situ He-Ne laser를 이용하여 측정하였고, electroactive layer thickness를 통해 degradation된 정도를 실험하였다. The durability problem of Prussian blue in non-aqueous $Li_+$-based electrolytes has been due to the degradation of the Prussian blue electrode matrix during the insertion/extraction processes by $Li_+$. In this work, we designed and synthesised the Prussian blue without reducing the electrochromic performance in non-aqueous $Li_+$-based electrolytes. Prussian blue was electrodeposited on a glass which has ITO coating, and the coating solution is a mixture solution of $FeCl_3\;and\;K_3Fe(CN)_6$ with deionized water added HCl, KCl, and LiCl, respectively. The durability of Prussian blue was evaluated by an in-situ transmittance measurement during a continuous and pulse potential cycling test, and measured by electroactive layer thickness due to evaluating the degradation.
MEA 제조 방법에 따른 직접 메탄올 연료전지의 성능저하 현상 평가
조윤환(Cho, Yoon-Hwan),조용훈(Cho, Yong-Hun),박현서(Park, Hyun-Seo),원호연(Won, Ho-Youn),성영은(Sung, Yung-Eun) 한국신재생에너지학회 2007 신재생에너지 Vol.3 No.1
Catalyst coated membrane [CCM] type and catalyst coated substrate [CCS] type of membrane electrode assembly [MEA] were manufactured and evaluated their performance. Degradation test were conducted to find the difference of long term stability in two types of MEA and the factor for performance degradation problem occurred. Performance degradation test of single cell in two different types of MEA were carried out when current density was 200mA/cm^{2}. The degradation test had proceeded for 230 hours and performance degradation was checked by I-V curve and impedance measurement at regular intervals. Also, MEA before/after operation and changes of catalyst layer were characterized by SEM, TEM, and XRD. Maximum power density of CCM type was higher than that of CCS type. Meanwhile, an increase of particle size of catalyst and an increase of impedance resistance after long term operation were observed. In the case of using CCM type MEA, the performance was deteriorated 38% of initial performance. In the case of using CCS type MEA, the performance was deteriorated 43% of initial performance. In consideration of difference of initial performance, performance of CCM type is higher than that of CCS type but both types had similar problems during degradation test.
구리촉매하에서 규소와 메탄올의 반응에 의한 사메톡시실란 반응속도 연구
양현수,소순영,원호연,전용진,이범재 한국공업화학회 1998 응용화학 Vol.2 No.2
The reaction of methanol with silicon was carried out in a mixed bed reactor into tetramethoxysilane at 210 ℃. In order to determine the kinetics of the reaction per reaction site on the silicon surface, a flowrate transition technique was employed. A kinetic study showed this reaction was in linear relationship with contact mass and independent on the concentration of methanol. This result indicates that the rate-determining step is not the chemical process involving methanol but the diffusion of silicon to form silylene intermediate.