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가속수명시험을 이용한 조명용 WOLED의 수명예측에 관한 연구
최충석(Chung-Suk Choi),문진철(Jin-Chel Moon),박형기(Hung-Ki Park) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
This paper presents an accelerated life test for White Organic Emitting Diodes(WOLEDs), influence of several operating conditions on luminance degradation in full color organic lighting diodes has been investigated by the analysis of its luminance decay curve, the conditions varied were temperature(60℃, 80℃) and applied direct current voltage(16V, 20V). To estimate the degradation failure of WOLED device, an accelerated life test(ALT) was planned by temperature and voltage are selected as accelerating variables through the environment test about failure mechanism We assumed that Weibull lifetime distribution and a generalized linear model of life-stress relationship hold through goodness of fit test. Using ALT software, we estimated the common shape parameter of Weibull distribution, life-stress relationship, and accelerating factor. mean time between failure(MTBF) has a about 950 hours at room temperature and normal voltage.
박상태(Sang-Tae Park),이복영(Bok-Young Lee),홍성호(Sung-Ho Hong),최충석(Chung-Suk Choi),길형준(Hyung-Jun Gil),한운기(Woon-Ki Han) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.5월
This paper presents study on the electric potential distribution when have a short in street lamp. In order to measure electric potential testing ground is built in. A experiment is conducted to simulate dry and submerged situation of street lamp. The street lamp is leaked by artificial means. And electric potential is measured in grounded street lamp and street lamp alone. The results show that touch voltage of grounded street lamp is possible to more high than street lamp alone. And the electric shock hazard is high because high electric potential is distributed near submerged street lamp. Also if street lamp is submerged ground is not useful to decrease electric shock hazard.