• 조명전기설비학회논문지
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• 제24권12호
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• pp.25-32
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• 2010

Compared to general lighting method, the lighting system that uses optic fiber can provide only the visible light of good quality to subject by eliminating ultraviolet ray and infrared ray. Thanks to this merit, it is possible to prevent the hard phenomenon of subject caused by ultraviolet ray and infrared ray and to provide the agreeable light environment. This study developed indoors illumination system of high color rendering on the basis of plastic optic fiber with excellent optical property and processing to substitute halogen lamp which has been used for excellent color rendering in spite of low efficiency and short life. Producing pilot product of the designed illumination system and evaluating the property of electric and optical property, ultraviolet ray radiation quantity and temperature property, this study verified the excellence of suggested lighting system of plastic optic fiber.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.658-667
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• 1996

A computer vision system was developed to automatically detect and locate the oyster hinge line, one step in shucking an oyster. The computer vision system consisted of a personal computer, a color frame grabber, a color CCD video camera with a zoom lens, two video monitor, a specially designed fixture to hold the oyster, a lighting system to illuminate the oyster and the system software. The software consisted of a combination of commercially available programs and custom designed programs developed using the Microsoft CTM . Test results showed that the image resolution was the most important variable influencing hinge detection efficiency. Whether or not the trimmed -off-flat-white surface area was dry or wet, the oyster size relative to the image size selected , and the image processing methods used all influenced the hinge locating efficiency. The best computer software and hardware combination used successfully located 97% of the oyster hinge lines tested. This efficienc was achieve using camera field of view of 1.9 by 1.5cm , a 180 by 170 pixel image window, and a dry trimmed -off oyster hinge end surface.

• 한국임상수의학회지
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• 제18권3호
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• pp.215-225
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• 2001

This study presented the results of ophthalmic examinations performed on 545 Korean Jindo dogs. The most prevalent ocular variation within normal limits was hyoid vessel remnant (12.7%) and prominence of lens suture was also noticed (1.7%). The most common ocular diseases were retinal scars (6.8%), focal cataract (4.6%) and persistent pupillary membrane (4.2%). Inherited ocular diseases found in this study were persistent pupillary membrane (4.2%), persistent hyperplastic primary vitreous (0.6%), retinal dysplasia (0.6%), entropion (0.4%) and progressive retinal atrophy (0.4%). The prevalence of ocular diseases was higher in Male than in Female and proportionately higher in the older dogs. The most prevalence was shown in white coat color dogs. The fundus color changes according to the age was not related in coat colors and shown same pattern.

• Journal of the Korean Wood Science and Technology
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• 제41권5호
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• pp.399-405
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• 2013

This study demonstrates the utilization of light microscopy and Fast Fourier Transform-Peak Finding (FPF) method for microfibril angle (MFA) measurement from unstained sections of red pine (Pinus densiflora). To obtain an image with optimal contrast and resolution for MFA measurement, effects of numerical aperture (NA) of condenser lens and color filters were investigated. About 60% of NA of the maximum condenser NA produced an image with optimal contrast, but a color filter with short wavelength range (DAPI) created images with improved resolution. Manual angle measurement and the FPF method were applied to the image with optimal contrast for MFA measurement. The experimental results from the FPF method were considered to be more repeatable and less subjective than those from the manual angle measurement.

• 조명전기설비학회논문지
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• 제22권12호
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• pp.1-9
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• 2008

이 논문에서는 100[W]급 Discrete LED 투광기 조명 제품 개발에 관한 것으로, 3[W] RGBA LED를 이용하여 광색 및 색온도 제어가 가능하도록 광학/방열/회로/시스템 설계를 통한 시제품을 제작하였다. 그 결과, 색온도 $2,000{\sim}10,000[K]$ 범위에서 흑체궤적에 정확히 일치하면서 연색지수가 $71{\sim}91$까지 고연색성을 실현하였으며, 동작전압 $90{\sim}250[Vac]$, 효율 87[%], 역률 93이상의 양호한 전기적 특성을 나타냈다. 또한 투광기의 협각/중각/광자 배광을 만족하기 위하여 LED 렌즈를 설계하였으며, 신뢰성 확보 및 주위온도에 따른 광출력 변화를 최소화할 수 있는 방열설계를 실시하였다.

• 한국세라믹학회지
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• 제52권4호
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• pp.229-233
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• 2015

Currently, the majority of commercial white LEDs are phosphor converted LEDs made of a blue-emitting chip and YAG yellow phosphor dispersed in organic silicone. However, silicone in high-power devices results in long-term performance problems such as reacting with water, color transition, and shrinkage by heat. Additionally, yellow phosphor is not applicable to warm white LEDs that require a low CCT and high CRI. To solve these problems, mixing of green phosphor, red phosphor and glass, which are stable in high temperatures, is common a production method for high-power warm white LEDs. In this study, we fabricated conversion lenses with LUAG green phosphor, SCASN red phosphor and low-softening point glass for high-power warm white LEDs. Conversion lenses can be well controlled through the phosphor content and heat treatment temperature. Therefore, when the green phosphor content was increased, the CRI and luminance efficiency gradually intensified. Moreover, using high heat treatment temperatures, the fabricated conversion lenses had a high CRI and low luminance efficiency. Thus, the fabricated conversion lenses with green and red phosphor below 90 wt% and 10 wt% with a sintering temperature of $500^{\circ}C$ had the best optical properties. The measured values for the CCT, CRI and luminance efficiency were 3200 K, 80, and 85 lm/w.

• 한국통신학회논문지
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• 제31권1C호
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• pp.36-45
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• 2006

본 논문에서는 효과적인 3차원 영상 디스플레이를 위한 다시점 영상왜곡 보정처리 시스템 구현을 제안한다. 본 논문에서 제안한 보정처리 시스템은 기존의 스테레오 방식에서 확장된 4시점으로 카메라를 구성하여 영상을 획득하고 다시점 영상 간에 발생할 수 있는 렌즈의 왜곡, 카메라 오차 및 크기, 카메라 간 밝기 및 색상, 영상 간 밝기 균일도 등의 영상의 보정 신호처리에 대한 방법을 제시한다. 본 논문에서 제안된 시스템에서는 카메라 간 밝기 및 색상 보상은 각 영상의 특징점과 대응점을 찾아 영상 전체에 대한 대응점을 추출하여 색 변환을 통해 영상을 보정하였고 밝기 및 균일도 처리는 각 영상의 밝기차이 맵을 생성하여 보상하였다. 또한 렌즈의 구면수차로 인한 왜곡은 각 영상의 패턴을 검출한 후 렌즈 왜곡을 보정하고 카메라의 오차 및 크기 보상을 통해 다시점 3차원 디스플레이시 발생되는 왜곡현상을 해결하여 보다 효과적인 3차원 입체 디스플레이가 가능하도록 하였다.

• 한국산학기술학회논문지
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• 제17권2호
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• pp.666-671
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• 2016

본 논문에서 소개하는 기기는 병의원의 수술실에서 수술전용조명인 무영등만으로는 직접 조명할 수 없는 수술부위의 환부에 근접 국부조명을 제공하는 장치로서, 임상의들이 인체 깊숙한 환부의 질환 치료를 안전하게 시술하도록 한다. 이 의료 보조조명 장치는 종양제거나 혈관봉합과 같은 미세한 수술과정에서 발생할 수 있는 치명적인 수술 실패를 방지하기 위해서 필요한 장치이다. 광원 및 전원부 등의 구성요소는 저전력, 소형화로 설계되었으며, 협각렌즈를 사용하여 광확산 효과의 증가와 집중 조명에 용이하도록 하였다. 광케이블을 사용한 조명전송과 조명장치의 Endcap은 사용 후 다음 환자를 위하여 소독이 가능하도록 방수형으로 설계되었다. 리트렉터 조명장치 개발 후 이루어진 광원특성 측정 결과, 조도 490lux, 휘도 $11,550cd/m^2$, 연색성 78, 색온도 11,000K 및 고른 조도분포도를 보여 국부 의료보조조명으로서 적합하였음이 확인되었다.

• 한국세라믹학회지
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• 제50권6호
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• pp.454-459
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• 2013

Recently, remote phosphors have been reported for application to white LEDs to provide enhanced phosphor efficiency compared with conventional phosphor-based white LEDs. In this study, a remote phosphor was produced by coating via screen printing on a glass substrate with different numbers of phosphor coating. The paste consists of phosphor, lowest softening glass frits, and organic binders. The remote phosphor could be well controlled by varying the phosphor content rated paste. After mounting the remote phosphor on top of a blue LED chip, CCT, CRI, and luminance efficiency were measured and values of 5300 K, 62, and 117 lm/W were respectively obtained in the 80 wt% phosphor with 3 coating layers sintered at $800^{\circ}C$.

• 한국환경보건학회지
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• 제34권1호
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• pp.95-100
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• 2008

An automatic titration system using a PC-camera with a color filter on its lens was used in the $KMnO_4$ consumption test of tap water and distilled water in relation to blank tests. The very faint pink color of titration end point could be effectively detected by using a yellow cellophane paper as a color filter. The average hue value (Havg) of 192 pixels in the image of the sample solution being titrated was computed and followed up at regular time intervals during titration in order to detect the titration end point. The Havg decrease of 2 degrees from the average of first 10 Havgs was regarded as reaching the end point. The volume of 0.01N $KMnO_4$ consumed by a tap water sample was $0.728{\pm}0.022ml$ in manual titration and $0.735{\pm}0.013ml$ in automatic titration (p=0.580). The volume of 0.01N $KMnO_4$ consumed by a distilled water sample was $0.383{\pm}0.015ml$ in manual titration and $0.367{\pm}0.015ml$ in automatic titration (p=0.252). The high p-values for t-test suggested that there were good agreements between manual and automatic titration data and the automatic method proposed in this article was considered to effectively replace the manual titration.