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강다일,김근율,유영문,최희락,Kang, Da-Il,Kim, Kun-Yul,Yu, Young-Moon,Choi, Hee-Lack 한국광학회 2014 한국광학회지 Vol.25 No.2
본 논문에서는 현재 양산되고 있는 Red(621 nm), Green(530 nm), Blue(453 nm), Amber(590 nm) 등 4파장의 LED 조합을 이용하여 색온도가 가변되는 동안에도 평균연색지수 및 특별연색지수 R9 값이 높게 유지될 수 있도록 조명의 스펙트럼을 최적화하였다. 최적화 시 설계의 정확도를 높이기 위하여 실제 측정한 LED 스펙트럼을 사용하였고 광선과 기구물 사이의 상호 작용을 고려한 광선 추적 기법을 활용하여 수행하였다 또한 최적화 결과를 검증하기 위하여 색온도 가변 조명 장치를 직접 제작하였으며 광 특성을 평가한 결과 색온도가 3000 K에서 6000 K까지 변하는 동안 CRI 및 R9 값이 각각 87~90, 34~93을 나타내었다. In this paper the spectra of correlated color temperature (CCT) tunable white light-emitting diode (LED) luminaires, consisting of commercial red, green, blue, and amber LED chips, were optimized to increase color rendering index (CRI), and a special CRI of R9 for deep red color was obtained. To improve the design's accuracy, measured LED spectra were used instead of mathematically modeled ones. Real CCT tunable LED luminaires with CRIs of 87-90 and R9s of 34-93 were fabricated and demonstrated at CCTs of 3000-6000 K.
조상희(Sang-Hee Cho),김근율(Kun-Yul Kim),유영문(Young-Moon Yu) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.3
In this paper, tried to find out the proper luminous intensity distribution for the cabin with low-level height by analyzing the changing tendency of discomfort glare according to luminous intensity distribution of marine indoor luminaires using Unified Glare Rating(UGR). First, we analyzed UGR of the indoor luminaires in the existing cabin, and then evaluated influence on luminous intensity distributions of marine indoor luminaire. The results showed that cos<SUP>2</SUP>θ distribution got almost low UGR results regardless of height and UGR 16.5 in cabin height of 2m. However, Gaussian distribution with the same beam angle showed that UGR results consistently increased by getting lower height and UGR 20.7 in the same height. In conclusion, the cos<SUP>2</SUP>θ distribution in consideration of luminous intensity on the direction of observers eye was appropriate for general cabin indoor luminaires because it decreased UGR in the low-level height.
광폴리머를 사용한 두꺼운 홀로그램의 수축에 의한 혼선잡음
황용섭 ( Yong Sop Hwang ),김근율 ( Kun Yul Kim ),박주연 ( Joo Youn Park ),남하은 ( Ha Eun Nam ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
The crosstalk noise of thick holographic photopolymer is studied. Three different experiments, (1) reading area dependency (2) post-exposure effect (3) effect of later recorded holograms on earlier recorded holograms, have been accomplished and a tendency of crosstalk noises has been found for each case. The larger reading area, the higher crosstalk noises for the later recorded holograms. Before the post-exposure the crosstalk noises are higher in the earlier recorded holograms, but after the post-exposure the crosstalk noises are higher in the later recorded holograms. The crosstalk noises of the, earlier recorded holograms become higher as more holograms are recorded by multiplexing. To explain the tendency of crosstalk noises of these experiments, we suggest a model considering the anisotropic shrinkage of the photopolymer. According to the model, the shrinkage is more dominant at the center of the recorded region than the edge of that. After the post-exposure, however, the amount of shrinkage becomes the same for the whole recorded region. The results of all three experiments are well explained by this model.
맹필재(Pil-Jae Maeng),장재현(Jae-Hyeon Jang),김근율(Kun-Yul Kim),유영문(Young-Moon Yu),김종수(Jong-Su Kim),김종태(Jong-Tae Kim) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.8
This paper dealt with the LED optical illumination system design for the Masthead navigation light to replace halogen lamps. We made Fresnel lens satisfy luminous intensity distribution of “Convention on the International Regulation for Preventing Collisions at Sea(COLREG)”. The optical system is designed by classifying three parts: light source, lens, and cut off plate. The source of light has been made to have the uniform horizontal and vertical light distribution by placing 6 LEDs at intervals of 54°, and as the cylindrical Fresnel lens, the lens has been designed to achieve the uniform horizontal and vertical light distribution in the range of plain light. Finally, the cover has been designed to block the light from the outside of plain light and ultimately met the standards for light distribution of navigation lights. In addition, the validity of design has been verified with manufacturing a trial product.