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채원용(Won-Yong Chae),이경준(Kyoung-Jun Lee),김희제(Hee-Je Kim) 한국지능시스템학회 2010 한국지능시스템학회 학술발표 논문집 Vol.20 No.1
모바일 로봇은 인간에게 필요한 존재이다. 이러한 모바일 로봇은 장애물을 피하기 위한 거리 측정 시스템이 요구되어 진다. 특별히 적외선 센서는 저렴한 가격과 빠른 응답특성 때문에 상당히 주목을 받고 있다. 그러나 색깔에 따른 비선형적인 특성 때문에 여전히 문제가 제기되어지고 있다. 그래서 본 논문은 색깔의 변화에 따른 오류를 검출하기 위해 저가의 적외선 센서를 이용한 거리측정 시스템과 ADC Converter를 준비하였다. 이에 따른 거리 측 정 실험을 실시하였고 또한 적외선 센서의 사용에 의한 색깔 인식이 제시되었다.
상대전극 제작 방식에 따른 염료감응형 태양전지 특성 비교 연구
손민규(Min-Kyu Son),서현웅(Hyunwoong Seo),신인영(In-Young Shin),김진경(Jin-Kyoung Kim),홍지태(Ji-Tae Hong),채원용(Won-Yong Chae),김희제(Hee-Je Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Dye-sensitized solar cell (DSC) consists of photo electrode, counter electrode and electrolyte. Photo electrode has titanium oxide layer with dye molecule to create electrons. And counter electrode is made of one layer that has catalytic ability for redox system such as the iodide/triiodide couple. Most DSC researchers use platinum as catalyst on counter electrode because platinum has good catalytic ability and conductivity. Platinum is doped on fluorine-doped tin oxide glass with different methods such as sputtering method, electrochemical method and so on. In this paper, we deposit platinum on counter electrode glass with two methods. One is the radio frequency (RF) sputtering method and the other is the chemical method with heating treatment. Finally, we compare the photovoltaic characteristics of DSCs that are assembled using two different counter electrodes.
김희제(Hee-Je Kim),이정기(Jeong-Gee Lee),이경준(Kyung-Jun Lee),프라바카르(Prabakar),신동설(Dong-Seoul Sin),채원용(Won-Yong Chae) 대한전기학회 2010 전기학회논문지 Vol.59 No.1
The shadowing effects lead to the serious power losses of the PV module. The shadowing effects are caused by several factors such as leafs, dust, antenna and clouds. The dye-sensitized solar cells are more economical than the conventional silicon solar cell that's why the dye-sensitized solar cells are recently focused on. We carried out research on the efficiency of the dye-sensitized solar cell depending on the level of shadow changing the formula of the circuit. The research on the efficiency of the large dye-sensitized solar cell depending on the level of shadow focused on commercialization was carried out. As the results, it is known that the series and parallel connection method is the best choice for the least losses of PV module assemblies. It is especially known that one more series connection is the best choice for the least losses about shadowing effects and current losses in the series and parallel connection.
염료감응형 태양전지의 상대전극 Pt 필름 두께와 증착 각도가 효율에 미치는 영향에 관한 연구
김희제(Hee-Je Kim),여태빈(Tae-Bin Yeo),박성준(Sung-Joon Park),김휘영(Whi-Young Kim),서현웅(Hyunwoong Seo),손민규(Min-Kyu Son),채원용(Won-Yong Chae),이경준(Kyoung-Jun Lee) 대한전기학회 2010 전기학회논문지 Vol.59 No.3
Sputter deposition on a Pt counter electrode was studied using radio frequency (RF) plasma as the improvement of incident photon to current conversion efficiency (IPCE) for dye-sensitized solar cells (DSCs). Effects of the sputtering thickness and the incident angle on a Pt counter electrode for DSCs were investigated. Experiments to get the optimal sputtering time for the performance of the DSCs were carried out. And it is found that the optimized sputtering time was 120 seconds, in addition, the incident angles of the substrate was adjusted from 0° to 60°. The maximum efficiency of 5.37% was obtained at the incident angle of 40° with an active cell area of 1㎠.