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유병규(Yu Byung-Gyu),유영덕(Yoo Young-Duk),유권종(Yu Gwon-Jong) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
As photovoltaic (PV) systems have been installed widely across the world due to evironmental pollution and shortage of fossil fuel, the component technologies of PV have been improved and upgraged. Especially, in the field of PV inverter, the module integrated converter has been received a recent attention because it is easy to install as plug and play and flexible to expand the system capacity, etc. In this paper, the recent technical trend of photovoltaic module integrated converter is presented. The kinds of module integrated converters and their features are compared.
응력 파워스펙트럼 밀도를 이용한 차량 내구해석기술 연구
강성종(Sung Jong Kang),유영덕(Young Duk Yoo) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.2
In this study, an endurance estimation technique for vehicle body structures was inves-tigated and applied. Random road surface was measured and displacement PSD(power spec-trum density) of the road was calculated. And through random vibration analyses for full body shell finite element model using the displacement PSD as the input, stress PSDs were obtained at critical areas. Using this PSD, body fatigue life was estimated and displayed automatically as color contours using graphic method. In comparison with proving ground fatigue test results, predicted results show good agreements.<br/>