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옥상 설치형 solar tower 의 설계 및 성능 분석 연구
김동협(Dong Hyeop Kim),김영민(Yeong Min Kim),임소혁(So Hyeok Lim),채지환 (Ji Hwan Chae),박중열(Joong Yull Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Various methods to cope with climate change and environmental problems have gaining attention. Solar tower is one of promising regenerative power generation methods. The purpose of this study is to propose a novel idea for designing and installing an AT (appropriate technology)-based solar tower on the roof of a building, and analyze its performance considering the special structural characteristics of the roof of the building, that is, the existence of a surrounding wall. The optimized inlet height and chimney diameter were obtained using CFD to achieve the maximum kinetic energy. Furthermore, the model optimized through CFD was implemented in an actual experiment to confirm the theoretical flow phenomenon. Through this study, the possibility of solar technology combined with the conventional rooftop geometry was proposed and the specific design direction of the solar tower was presented.
Han, Dong Hyeop,Park, Sangmee,Kim, Eun Joong,Chung, Taek Dong Elsevier 2017 ELECTROCHIMICA ACTA Vol.252 No.-
<P><B>Abstract</B></P> <P>For redox flow battery, <I>1</I>-ethyl-<I>1</I>-methylpyrrolidinium bromide (MEPBr) is a promising bromine-complexing agent that forms insoluble organic phase of MEPBr<SUB>3</SUB>. A series of optical images acquired by <I>in-situ</I> confocal microscopy with tens of millisecond interval visualize how MEPBr<SUB>3</SUB> emulsion droplets are electrochemically generated and collide with the electrode surface. Two types of electrodes, i.e. a Pt microdisk of 10μm diameter and a 2.5mm long Pt wire of 25μm diameter, show clear correlation between electrochemical behavior and optical images. The droplets starts growing on the electrode surface at the potential at which oxidative faradaic current starts flowing. As the overpotential increases, the droplets become larger adhered at the electrode surface, from which small droplets start detaching at 0.925V or higher potential. Some of the droplets leave the surface, move back and collide with the electrode surface, thus producing current spikes, which are detected by chronoamperometry simultaneously. <I>In-situ</I> confocal microscopy in this study confirms that the droplets are heterogeneously generated by electrochemical reaction and that individual droplets collide back onto the electrode surface, thus providing a better understanding of the phenomena that happen at redox flow battery electrode surfaces.</P>
흰쥐를 대상으로 한 양파주의 알코올성 지방간 개선 효과
김주연(Juyeon Kim),서윤정(Yunjung Seo),박중협(Joong-Hyeop Park),노상규(Sang Kyu Noh) 한국식품영양과학회 2016 한국식품영양과학회지 Vol.45 No.4
본 연구에서는 흰쥐를 이용하여 양파주의 섭취가 알코올성 지방간 증상 완화에 미치는 영향을 조사하였다. Lieber-DeCarli 액체 표준식이만 공급받는 동물군을 대조군, 대조군 표준식이의 탄수화물 대신에 에탄올로 열량을 대체한 액체식이를 공급받는 동물군을 에탄올군, 에탄올로 열량을 대체한 식이에 양파주를 추가로 공급받는 동물군을 양파주군으로 설정하여 6주 동안 공급하였다. Lieber-DeCarli 식이공급 전, 3주째 그리고 6주째에 혈액을 채취하였고, 간은 6주째 혈액 채취 직후 적출하였다. 양파주 농축액의 섭취로 인해 혈액의 중성지방과 총콜레스테롤 농도는 에탄올군에 비해 현저히 감소하였다. 혈액의 ALT, AST, ALP 농도 모두 에탄올군에 비해 양파주군에서 감소한 것으로 나타났다. 또한 간 조직의 총지질과 콜레스테롤의 농도 모두 양파주의 공급으로 현저히 감소하였으며, 주요 지방산 비교에서도 대부분의 지방산이 에탄올군에 비해 양파주군에서 농도가 감소한 것으로 나타나 양파주의 공급이 간 조직의 지방산 축적도 억제한 것으로 나타났다. 본 실험을 통해 양파주가 알코올 섭취로 증가한 혈중 지질 수준과 간 기능 지표 수준을 개선하는 효과를 나타냈으며, 지방간 형성이 유의적으로 억제되는 것을 간 조직 지방분석을 통해 확인하였다. 이렇게 개선된 지표들을 바탕으로 양파주의 섭취는 간 조직 보호효과와 알코올성 지방간의 개선 효과를 유도할 수 있을 것으로 판단된다. This study was designed to investigate whether consumption of onion wine can reduce serum biomarkers of ethanol-induced fatty liver in rats. Male Sprague-Dawley rats were initially trained for meal feeding to prevent reduction of food intake. After the training period, rats were weight-matched and assigned to the following three groups: 1) a control group fed a control liquid diet containing maltose-dextrin, 2) an ethanol group fed an ethanol liquid diet with 95% ethanol, and 3) an onion wine group fed the same ethanol liquid diet but containing onion wine extract at 1 mL/d/group. All three groups were fed daily for 6 weeks. At 0, 3, and 6 weeks, blood was collected via the orbital sinus following overnight food deprivation and terminally organs collected. Blood lipids and transaminase activities significantly increased in the ethanol-fed group but significantly reversed in the onion wine-fed group. The hepatic levels of fat and cholesterol at 6 weeks were significantly elevated by ethanol administration but significantly reduced by onion wine. These findings indicate that onion wine may ameliorate ethanol-induced fatty liver by lowering hepatic and blood lipid levels.