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김재환(Jaehwan Kim),양상열(Sang Yeol Yang),장상동(Sangdong Jang),고현우(Hyun-U Ko),문성철(Sungcheol Mun),김동구(Donggu Kim),강진호(Jinho Kang) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Cellulose Electro-Active Paper (EAPap) is attractive as a bio-mimetic actuator due to its merits in terms of lightweight, dry condition, large displacement output, low actuation voltage and low power consumption. Cellulose has been regenerated so as to align its microfibrils along a direction, which results in a piezoelectric paper. By chemically bonding and mixing with carbon nanotubes, titanium oxide, zinc oxide, tin oxides, the cellulose EAP can be a hybrid nanocomposite that have versatile properties and can meet material requirements for many application devices. This paper introduces recent research trend of the cellulose EAPap, mainly material preparations as well as application devices including temperature and humidity sensors, biosensors, chemical sensors, flexible transistors and actuators. This paper also explains wirelessly driving technology for the cellulose EAPap, which is attractive for biomimetic robotics, surveillance and micro-aerial vehicles.
25W급 순환유동층반응기에서 석탄과 우드펠릿의 혼소 특성 연구
김진호(Jin Ho Kim),양상열(Sang Yeol Yang),김규보(Gyu Bo Kim),전충환(Chung Hwan Jeon) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.8
순환유동층연소기술은 적용 연료의 다양화, 설비의 경제성 그리고 환경성이 우수하여 최근 전력생산기술로 관심이 증대되고 있으며 최근 전력생산을 위한 재생에너지 사용 의무규정에 따라 재생에너지의 연소특성을 파악하는 것이 중요하다. 따라서 본 연구에서는 순환유동층반응기에서의 석탄과 우드펠릿을 혼소하여 혼소율에 따른 배기배출물 특성과 반응기 내부 가스온도특성의 환경성과 연소성을 실험적으로 분석하여 나타내었다. 총 공급 발열량을 기준으로 각 연료의 공급량을 변경하여 혼소율을 결정하였다. 베드물질로 강모래(7호사)를 적용하였다. 순환유동층반응기에서 우드펠릿 혼소율 증가에 따라 후단부에서의 가스온도가 감소하였고, CO, NOx, HC 및 SOx의 발생량은 우드펠릿의 혼소비가 30% 이하의 경우 혼소비 증가에 따라 감소하는 경향을 나타내었지만 30% 이상의 경우 CO, HC 및 SOx 발생량은 오히려 증가하는 경향을 나타내었다. Circulating Fluidized Bed(CFB) combustion has the several advantages which are the fuel flexibility, the economy, the efficiency and the environment. It is necessary to apply a renewable energy to produce electricity due to the Renewable Portfolio Standard(RPS) mandates recently. So, in this study, co-combustion with a coal and a wood pellet was investigated to evaluate the combustibility and the environment as function of blending ratio of them in a Lab-scale CFB reactor. To investigate the characteristics of the co-combustion, the blending ratio which is the weight of wood pellet by the total calorific value of the supplied, was considered. Bed material was a river sand(No. 7). As increasing the blending ratio, the exhausted gas emissions such as CO, NOx, HC and SOx were decreased. But in case of wood pellet over 30%, CO, HC and SOx emission were increased. And the gas temperatures at the downstream were decreased.
셀룰로오스 기반 Electro-Active Paper 작동기
장상동(Sangdong Jang),양상열(Sang Yeol Yang),고현우(Hyun-U Ko),김동구(Donggu Kim),문성철(Sungchul Mun),강진호(Jinho Kang),정혜전(Hyejun Jung),김재환(Jaehwan Kim) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.11
Cellulose Electro-Active Paper (EAPap) has been known as a new smart material that is attractive for a bio-mimetic actuator due to its merits in terms of lightweight, dry condition, large displacement output, low actuation voltage and low power consumption. Cellulose EAPap is made by regenerating cellulose and aligning its micro-fibrils. This paper introduces several EAPap materials, which are based on natural cellulose and its hybrid nanocomposites mixed/blended with inorganic functional materials. By chemically bonding and mixing with carbon nanotubes and inorganic nanoparticles, the cellulose EAPap can be a hybrid nanocomposite that has versatile properties and can meet material requirements for many applications. Recent research trend of the cellulose EAPap is introduced in terms of material preparations as well as application devices including actuators, temperature and humidity sensors, biosensors, chemical sensors, and so on. This paper also explains wirelessly driving technology for the cellulose EAPap, which is attractive for bio-mimetic robotics, surveillance and micro-aerial vehicles.