A Study on Optical Efficiency Improvement of LED-lighting Adopting Aspherical Optical System(I) (비구면 광학계를 적용한 LED 조명의 광학성능 향상에 관한 연구(I))
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- Journal of the Korean Institute of Electrical and Electronic Material Engineers
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- v.22 no.12
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- pp.1033-1038
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- 2009