• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.13 no.3
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• pp.1-6
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• 1999

SpeROD, the optical design program. is developed far specular reflectors of fluorescent luminaries. SpeROD can save much tirre when to design specular reflectors. SpeROD calculates conditions 2-dimensionally. The conditions for designing reflectors considered in this program are the intensity distribution, reflector type, and Tangent Spiral Design method. Using SpeROD, uniform intensity distribution type and bat-wing type reflectors are simulated in this paper, and alrrnn(T8) diarreter fluorescent lamp and lmnm width reflector are used for the setting. The sarre setting was simulated in FIElD, the intensity distribution prediction program. and the' result represented the intensity distribution and the efficacy simulated in SpeROD were satisfactory.actory.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.05a
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• pp.166-169
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• 2007

최근에 정부의 "15/30 LED조명 보급정책"에 힘입어 개발된 8W급 조명용 LED광원의 CIE 색도좌표 (chromaticity coordinate)와 주파장(dominant wavelength)등을 측정 고찰 하였다. 적색(R), 녹색(G), 청색(B), 백색(W)순으로 주파장은 각각 620[nm], 531[nm], 465[nm], 579[nm]이고, 자극순도(excitation purity)는 0.98, 0.82, 0.97, 0.15이며, 휘도순도(colorimetric putity)는 45[%], 16[%], 279[%], 6[%]로 나타났다. Power LED의 최적배치 설계로서, 특히 백색 LED광원의 경우 백열전구(15 lm/W)에 비해 3배 이상의 높은 효율(47.71m/W)을 보였고, 배광측정에서는 78.7%의 효율로 나타났다. 현재 LED광원은 MR16이나 베이스 타입 등의 형태로 제작하여 스탠드, 복도등, 비상유도등, 침실용 등의 용도에 사용되고, 일부는 LED의 원형이나 면(flat)타입으로 가로등이나 투광등으로도 활용되고 있다. 따라서 이들에 대한 각각의 특성들을 제시해 둘 필요성인 인지되어 국내 최초로 개발된 R/G/B/W 8W급 LED광원에 대한 기본적인 광특성 결과를 얻었으며, 이중에서 HB 백색 LED램프의 색도좌표 값을 얻어 CIE표준광과의 색도좌표(x, y) 위치를 비교 검토할 수 가 있었다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.5
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• pp.1198-1206
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• 2011

In this paper, we proposed a home network integrated dimmer switch using Z-wave Mesh Network. The dimmer switch come with wired and wireless network-based intelligent lighting switch that can be installed in a apartments with home network technologies. This switch is ease to install and operate. Furthermore, it provide power saving through efficient control of light using motion detect sensor and light intensity sensor. In order to evaluate the performance of our developed home network integrated dimmer switch, we performed a load performance test and from our result, it showed excellent performance in terms of lighting control and communication speed.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.4
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• pp.37-42
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• 2006

The effect of arc like streamer discharge is investigated on the hydrogen generation using the multineedle-plate electrode geometry plasma realtor(MPER) and the needle-plate electrode geometry plasma reactor(NPER). In order to restrict waves at the water surface when the high voltage applied, two kinds of the insulator such as the rectangular mesh or the hole mesh type are installed under the water surface. The discharge assistant of the two type(the saw type and the $TiO_2$ pellet type) was placed under the water surface to investigate the effect of the water surface conditions. The experimental results are compared in case of the reactor with and without the discharge assistant on the water surface.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.5
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• pp.8-14
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• 2003

The daylight responsive dimming system, which uses daylight and automatically controls the light output of electric lighting according to the amount of 3.vailable daylight, is an energy saving system Successful performance relies on how photosensor signal can precisely represent workplace illuminance. However, it is not accurately identified due to the dynamic nature of the sun and the sky changed with respect to different seasons or time. The purpose of this research is to identify the correlation between workplace illuminance and photosensor signals, and propose an optimal location and spatial characteristics of the photosensor through experiments, which minimizes the above impacts and improve system performance.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.1
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• pp.61-66
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• 2010

The purpose of this experiment is to analyze the basic status of brain. Which are consist of rest, attention and concentration, of the brain by measuring the temperature of color by changing RGB color after manufacturing LED-illumination stand. Basic status (rest, attention and concentration) of experimenter were measured temperature of colors having three difference temperature like as $2,300^{\circ}K$, $4,000^{\circ}K$ and $6,000^{\circ}K$. The results was shown that experimenter feels more comfortable and relaxation by decreasing the temperature of color. For example we can see the little increase of concentration index at $4,000^{\circ}K$ condition and we can estimate that right brain can be more activated at the $4,000^{\circ}K$ condition. But we can not find out any different at the $6,000^{\circ}K$ condition. Main cause of no difference from the color temperature was the similarity of color temperature under the general fluorescent lamp. And interface temperature of radiant heat design results LED and PCB was approximately 80 degrees to COMSOL Multiphysics, and changed until approximately 50 degrees until a floor plane of PCB, and verification as arranged chip LED to metal PCB, and it was possible, and a near radiant heat design was confirmed to an approximate value of, as a result, acid manufacture.

• Korean journal of communication and information
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• v.23
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• pp.47-77
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• 2003

Despite the near ubiquity of mobile phone and internet, the 'meta research' that deals with face-to-face(FTF), mobile phone and internet together as interpersonal media is very rare in Korea. This study begin with the purpose of fair repositioning of mobile phone and internet in Korean's interpersonal communication horizon. To accomplish this purpose, We examined the effect of face-to-face communication situation on uses of mobile phone and internet as interpersonal communication media. The related raw data were collected from on-line survey process, and statistically analyzed. The result showed that persons who are more troublesome in FTF communication because of their timidness or personality problem are more restricted in human communication network via mobile phone and internet than the others who are not. And more 'addicted' in internet use and more active in trying another personality(Persona) in cyber space. And more shrunk in meeting and conversation with family members and friends after internet adoption.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.71-71
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• 2015

표면영상유속계(Surface Image Velocimety, SIV)는 하천 표면의 영상을 분석하여 유속을 산정하는 매우 실용적이며 간편한 유속측정 방법이다. 그러나 표면영상유속계는 수표면의 움직임을 계산하여 표면유속을 산정하기 때문에 빛이 없는 야간의 경우 수표면의 움직임을 촬영하기 어려워 밤에 발생하는 홍수 유량 측정이 어려운 단점이 있다. 이를 해결하기 위해 수표면에 야광 입자를 흘려 촬영하는 방법이 있었으나 대하천의 경우 야광물질의 크기가 작아 영상 내에서 식별이 어려운 문제가 있었고, 높은 밝기의 조명을 사용하여 영상을 획득하는 방법 또한 수행되었으나 빛이 수표면에 반사되어 하천 전체를 촬영하기 어려운 문제점이 있었다. 이 후 근적외선 카메라를 이용하여 야간 측정의 어려움을 극복하고자 하였으나 촬영범위가 최대 50 m 정도로 조사 거리의 한계를 나타내었다. 최근 Fujita(2013)는 원적외선카메라를 이용한 하천 유량 측정을 실시하였는데 이는 기존 야간촬영 시 시도되었던 방법의 문제점을 해결할 수 있음을 보여주었다. 이에 본 연구에서는 원적외선 카메라를 이용한 표면영상유속계의 적용성을 검토하고자 실험수로에서 실험을 수행하였다. 실험 시 주간 및 야간의 상황을 설정하여 원적외선 카메라, 근적외선 카메라 그리고 일반 캠코더를 이용하여 흐름을 촬영하였다. 또한 프로펠러유속계를 이용하여 흐름의 표면유속을 측정하였다. 원적외선 카메라를 이용하여 촬영된 영상을 상호상관법을 이용하여 표면유속을 측정하였고, 이를 프로펠러유속계 측정결과와 비교하여 정확도를 검토하였다. 또한 일반 캠코더와 근적외선카메라의 영상 분석 결과와도 비교하여 개선점을 확인하였다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.38 no.3
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• pp.292-303
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• 2001

Object color can be determined by the characteristic of scene illuminant and surface. In this paper, perceived illumination effect is extended and with the highlight analysis, hybrid approach is proposed to estimate the illuminant chromaticity. The perceived illumination approach provides a stable candidate range for the estimation of illuminant chromaticity, however, the accuracy is slightly degraded depending on the image contents. The highlight approach does not depend on the image contents and provides an accurate solution of the scene illuminant chromaticity, however, it is difficult to determine the final solution among many cross-points. These two approaches are in effect mutually compensating. The solution from perceived illumination can be used as a starting point or as base information for the highlight approach to get the final solution.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.13 no.2
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• pp.1-6
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• 1999

Average illuminaoce and luminance can be calculated by grarhical rrethods to a certain extent, but to calculate for a wide place, a suitable software is needed. Softwares suitable for this purpose have been already developed in foreign nations, but the appropiate softwares for domestic use have not been developed 1berefore a program is develqJed which is executable in Hangul Windows. The softwares LAPRoad, is develqJed to calculate luminaoce and illuminance distribution of road surlace, as well as average luminance and illuminance, overall uniformity, longitudinal uniformity, threshold increement, veilling luminance, and glare. And an apparatus that measures road surface reflection properties is developed. Because the road surlace reflection properties is very important in luminance calculation, then concrete road surlace reflection properties were measered.asered.