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선경철(Sun Kyung-Chul),차인수(Cha In-Su) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
Building-integrated photovoltaics(BIPV) are increasingly incorporate into new domestic and industrial buildings as a proncipal or ancillary source of electrical power, and are one of the fastest growing segments of the photovoltaic industry. This paper presents operational features analysis and PCS(Power Conversion System) factors of grid-connected 30kW BIPV on library of Dongshin University. The data consisted of insolation, Temperature, solar-cell performance and inverter performance are collected by IVIsion web monitoring system and analyzed. The analyzed data gave this paper effect elements of optimal operation.
선경철(Kyung-Chul Sun),박세준(Se-Joon Park),최정식(Jeong-Sik Choi),차인수(In-Su Cha) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
본 논문에서는 유량변화에 따른 200W급 PEMFC 운전특성을 연구하였다. 연료공급은 수소탱크와 공기공급용 컴프레셔를 이용하였고 유량은 MFC를 이용하여 제어하였다. 연료의 가습은 Bubbling type을 사용하였고 유량변화에 대한 반응차이를 크게 보기 위해 Back pressure 레귤레이터를 제거함으로써 확연한 차이를 얻을 수 있었다.
유도 초음파 신호 분석을 위한 적응 단시간 푸리에 변환
홍진철(Hong, Jin-Chul),선경호(Sun, Kyung-Ho),김윤영(Kim, Yoon-Young) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.3
Although time-frequency analysis is useful for dispersive wave analysis, conventional methods such as the short-time Fourier transform do not take the dispersion phenomenon into consideration in the tiling of the time-frequency domain. The objective of this paper is to develop an adaptive time-frequency analysis method whose time-frequency tiling is determined with the consideration of signal dispersion characteristics. To achieve the adaptive time-frequency tiling, each of time-frequency atoms is rotated in the time-frequency plane depending on the local wave dispersion. To carry out this adaptive time-frequency transform, dispersion characteristics hidden in a signal are first estimated by an iterative scheme. To examine the effectiveness of the present method, the flexural wave signals measured in a plate were analyzed.
홍진철(Hong, Jin-Chul),선경호(Sun, Kyung-Ho),김윤영(Kim, Yoon-Young) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.4
For successful guided-wave damage inspection, the appropriate signal processing of measured wave signals is very important. The objective of this paper is to introduce an efficient signal processing technique especially suitable for the guided-waves used for damage detection. The key idea of this technique is to model guided-waves by chirp functions of special form considering the dispersion phenomenon. To determine the parameter of the chirp functions simulating guided-waves, the matching pursuit algorithm is employed. The damage information in waveguides can be extracted by pulse-characterizing parameters. The effectiveness of present method is checked with the guided wave-based damage inspection.