• Title/Summary/Keyword: 면조명

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광학R&D산실-한남대학교 광전자물리학과 광학설계연구실

  • Park, Ji-Yeon
    • The Optical Journal
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    • s.99
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    • pp.39-41
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    • 2005
  • 한남대학교 광전자물리학과의 광학설계연구실은 산업적 응용성이 강한 첨단 응용 광학 연구에 매진함은 물론 높은 취업률이 입증하듯 인재양성의 전략적 거점으로 발돋움하고 있다. 최근 산업계에서 개발이 활발한 초소형 카메라 렌즈모듈을 비롯하여, 내시경용 비구면 렌즈, 각종 조명 광학계, 대구경 비구면 측정용 널(Null) 렌즈 설계 및 제작, 비구면 평가 등 다양한 분야의 연구활동을 벌이고 있는 가운데, 단순 기초교육 및 학문적인 연구에만 머무는 것이 아니라 산업계 및 연구소와 함께 다양한 연구개발 실적 및 논문을 발표하며 활발한 활동으로 주목을 받고 있다.

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The Effect of indoor illuminance depends on direction of the side windows lighting (측창채광의 방향에 따른 실내조도의 영향)

  • Cho, Shee-Man;Kim, Won-Joong;Jang, Woo-Jin
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2004.05a
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    • pp.253-260
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    • 2004
  • 실내의 조명은 자연채광방식과 인공조명으로 나누어지는데 자연형 채광방식에서도 측창채광과 천창채광, 정 측창채광 그리고 반사 채광방식이 있다. 측창채광은 벽면에 대하여 일반적으로 연직인 창에 의한 채광을 말한다. 측창채광의 방향에 따라 실내조도는 영향을 많이 받는다. 따라서 본 연구는 측창채광의 동서남북의 방향에 따라 봄, 여름, 가을, 겨울의 계절에 따라 아침, 점심, 저녁시간대에 따라 변화되는 실내조도를 알아보았다. 실험방법은, 조명시뮬레이션 프로그램인 Lightscape V3.2를 사용하여 교실공간의 치수와 작업면의 높이를 가로 5.8[m], 세로 10.8[m], 높이 3[m], 작업면의 높이 0.75[m]로 정하였고, 각 시설물의 반사율[p]은 벽 80%, 창문 12%, 출입문 13%, 바닥 20%, 천장 85%로 지정하였으며 창문의 투과율은 88%로 설정하였다. 본 연구에서 측정하고자 하는 변수 값은 계절은 여름을 6월20일, 겨울은 1월20일 기준으로 하고 시간대는 09시, 13시, 18시로 하였으며 창측방위는 동, 서, 남, 북으로 정하였으며 계절과 시간은 가장 차이가 많이 나는 값을 선택하였다. 결론으로 창이 남쪽일 때 평균조도가 9,100[lx]로 가장 높았고, 시간별로는 점심에 19,590[lx]로 조도가 가장 높은 것을 알 수 있었고 조도 균제도는 창이 동쪽일 때 겨울에 가장 높았다. 창이 북쪽일 때는 여름이 겨울보다 평균조도가 약간 높았고, 시간별로는 아침에 조도가 약간 높은 것을 알 수 있었고 전체적으로 북쪽 창에서 실내조도가 현저하게 떨어지는 것을 알 수 있었다. 이와 같은 결과로 측창의 브라인드를 현재 사용하고 있는 수직 브라인드 대신에 수평 브라인드를 사용하여 주광의 범위를 넓게 조절하여 사용하게 하고, 점등제어를 현재 측창면과 수직으로 되어있는 배열을 수평으로 한다면 자연채광의 효과를 배가 할 수 있으리라고 사료된다. 미백 전, 미백후, 재광화 후 미세경도 변화 양상이 미백을 하지 않은 대조군과 차이를 보이지 않았으며 (p > 0.05) 미백 전과 미백 후의 미세경도의 차이 미백후와 재광화 후의 미세경도의 차이도 유의할 만한 차이가 없었다 (p > 0.05). 따라서 시중에 판매되고 있는 whitening strip과 미백 젤은 14일 동안의 통상적인 미백과정 동안 법랑질의 미세경도에 영향을 미치지 않는 것으로 사료된다.able pitch와 helical angle보다는 근본적으로 radial land가 screw-in effect의 예방에 더 큰 역할을 하는 것으로 추정될 수 있다 따라서 NiTi file의 사용 경험이 없는 초심자의 경우 근단부 폭경의 유지능력이 좋은 ProFile$^{(R)}$의 사용이 추천된다.)되었다.였으나 강남콩군 외에는 단백질의 소화 흡수율 및 효율은 크게 향상되지 않아 단백질의 소화 흡수율을 떨어뜨리는 요인에 관한 연구가 집중적 으로 이루어져야 하리라고 생각된다.면 바로 위 지점의 풍속을 측정하였다. 각 Seeding 물질에 대해 팬을 켜지 않았을 때, 즉 바람의 영향이 없을 때 측정한 표면유속을 바람의 세기가 변한 경우의 기준 표면유속으로 이용하였다. 본 연구의 결과 비중이 0.01 내외인 Ecofoam과 white polystyrene에 비해 비중이 0.92인 black polypropylene은 대부분이 물속에 잠겨 있어 흐름과 거의 일치하여 움직임을 알 수 있었다. 또한 흐름의 평균유속이 0.165 m/s의 저유속에서 바람이 tracers에 미치는 영향이 평균유속 0.558m/s인 경우보다 커서, 바람의 세기의 증가에 따라 표면유속 측정값이 급속히 감소되었다. 흐름의 평균유속이 큰 경우에는 바람이 tracer에 마치는 영향이 현격히 줄어듬을 보이고 있다. 결론적으로 유속이 증가함에 따라 바람의 영향은 감소하나, 바

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A Study on the Evaluation of Lighting Performance in an Office Space (사무공간의 조명성능 평가에 관한 연구)

  • 김한성;김영민;김강수
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.17 no.6
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    • pp.16-22
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    • 2003
  • The purpose of this study was to provide visual evaluation data in a workstation space when different lighting types were applied. For the performance evaluation, Radiance program was used for simulations, and the mock-up room(15.0x11.6x3m) was used for the actual test. The results of this study were as follows; 1) When the inidirect lighting simulation data using Radiance was compared with the actual data in a small workstation space, there was a 6.5% difference. Therefore, Radiance program was proved to be useful for the evaluation of lighting performance. 2) Higher light levels (higher light ratio (%)) were recorded in the straddled layout and lower light levels (lower light ratio (%)) were recorded in the centered layout condition in most cases. 3) Also, the results show that the indirect luminaires and the straddled layouts provide higher uniformity, whereas the direct luminaires and the centered layouts have lower uniformity.

An Analysis of Luminance and Chromaticity on Outdoor Lighting of Historic Buildings -focused on Namdaemun and Kwanghwamun- (휘도와 색도측면에서 본 역사적 건축물의 야간경관조명 분석 -남대문과 광화문을 중심으로-)

  • 안현태;김정태
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.15 no.1
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    • pp.36-43
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    • 2001
  • Recently, outdoor lighting of buildings has bemIre activated in national level of Korea. Therefore, this study aims to analyze the outdoor ljghting effect of historic buildings with particular reference to two traditional gates architecture - Namdaemtul and Kwanghwamun For the purpose, luminance and chromaticity of outdoor lighting are measured. The results of the study are as follows; $\circled1$ Outdoor lighting of the historic buildings were mainly illuminated by the floodlights. In addition, up-lighting and accent lighting were locally used. $\circled2$ Basements and rooflines were specially emphasized, and they represented the night image of historical buildings. $\circled3$ Chromaticity distribution of historical building was wlute during the day. However, it was yellow dL1Jing the night due to the color and color temperature of outdoor lighting.ghting.

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The Characteristics Analysis of substitute LED and CNT Lighting for fluorescent lamp (형광등 대체용 LED조명과 CNT조명에 대한 전기적.광학적특성의 비교고찰)

  • Hwang, M.K.;Lim, J.M.;Shin, S.W.;Rho, J.Y.;Cho, M.R.;Lee, S.H.;Jeon, S.K.;Choi, S.J.;Yi, C.W.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.05a
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    • pp.205-208
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    • 2008
  • In this paper, we have measured and compared the optical and electrical characteristics of LED(light emitting diode) and CNT(carbon nano-tube) lightings. Especially, the IES format files are used for each of the luminaire LlD(luminous intensity distribution) analysis and light level simulation for analyze the maximum, minimum, and average light level. In the future, when CNT and the LED based lighting technology standards are writing, this data will be used in judging.

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An Analysis of Classroom Illuminance with Simulation Program and Improvement of Classroom Illumination (시뮬레이션프로그램을 활용한 교실조도 분석 및 개선방안)

  • Shin, Hyun-Man;Jang, Woo-Jin
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.05a
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    • pp.129-134
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    • 2009
  • The actual conditions of school illumination was investigated. The illumination state was classified by the number of installed luminaires per 1 classroom. The illuminance state was measured and analyzed. The work surface illuminance was up to the standard, but the illuminance on blackboard was below standard when there was no local illumination. As a result of conducting a simulation based on the mesurement of the reflection factors of the classroom finishing materials and lamp replacement and lamp cleaning, nine luminaires for general lighting and local lighting for the blackboard were required, and the kind of design considered illumination maintenance was called for.

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An Analysis of Classroom Illuminance with Simulation Program end Improvement of Classroom Illumination (시뮬레이션 프로그램을 활용한 교실조도 분식 및 개선안)

  • Shin, Hyun-Man;Jang, Woo-Jin
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.6
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    • pp.14-23
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    • 2009
  • The actual conditions of school illumination was investigated. The illumination state was classified by the number of installed luminaires per 1 classroom. The illuminance was measured and analyzed. The work surface illuminance was up to the standard, but the illuminance on blackboard was below standard when there was no local lighting. As a result of conducting a simulation based on the measurement of the reflection factors of the classroom finishing materials and lamp replacement and lamp cleaning, nine luminaires for general lighting and local lighting for the blackboard were required, and a design considering illumination maintenance was called for.

Development of Intelligence interior Lighting Control System Using Power Line Communication (전력선 통신을 이용한 지능형 실내조명 관리 시스템 개발)

  • Kim, Gwan-hyung;Kang, Sung-in;Hwang, Yeong-yeun;Byun, Gi-sig
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.10a
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    • pp.717-719
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    • 2009
  • It is addressed that traditional light systems are improper to be applied practically in the energy efficiency point of view. To overcome such drawback, advanced investigations are recently conducted for realizing remote control of several related equipments such as lights, heats, home appliances, etc. This paper proposes a novel power line communication system to effectively manage lights in which the conventional method is used without any modification. We timely control lights to reduce energy cost based on given time period.

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The Luminous Intensity and Luminaire Efficiency Analysis of White LED as Luminaire types for General Lighting (조명용 백색 LED광원의 등기구 형태에 따른 광도 및 기구효율 분석)

  • Hwang, Myung-Keun;Huh, Chang-Su;Seo, Yu-Jin
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.3
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    • pp.20-26
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    • 2004
  • In this paper, luminaire optical efficiency and luminous intensity according to array of HB(high brightness) white LED(light emitting diode) and globe types of luminaire were simulated by computer and made a comparative analysis. LEDs were arranged by square of 7ea X 7ea. LED space has been divided into 8.2mm, 10mm and 15mm that mean distances between luminous centers of LEDs, and luminaire globes were classified into 30mm and 50mm 묘묘 from luminous center of LEDs. Also the simulations were made with / without globe, globe types were specified by convex and embossing types of which sizes are 8.2mm and 5.0mm, So total 27 classes of simulation were performed. This paper is to help luminire development using LED light source called digital lighting of 21th century, by studying luminire effciency and luminous intensity of different types of globes.

High Luminous Efficiency Flat Light Source with Xe mixture Gas Discharge and Areal Brightness Control Method (제논 혼합가스를 이용한 고효율 면광원과 국부적 밝기 제어 방식)

  • Jung, Jae-Chul;Seo, In-Woo;Oh, Byung-Joo;Whang, Ki-Woong
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.10a
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    • pp.153-157
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    • 2009
  • A Highly efficient Mercury-free Flat Fluorescent Lamp (MFFL) with dielectric barrier Xe gas discharge was developed for an alternative of conventional line-type Cold Cathode Fluorescent Lamps (CCFLs) which shows a wide voltage margin and a stable discharge operation for diffuse glow discharge with an application of a auxiliary electrode. Electro-optic characteristics of the MFFL were examined through the changes in ambient temperature, total pressure and Xe partial pressure. the single cell is expanded into a multi-structured configuration to realize a large sized lamp by a simple repetition of the single cells, and a new driving scheme is proposed for an adaptive brightness control using dual auxiliary electrodes and bi-polar drive scheme. In addition, interesting application of this ultra high luminance flat lamp by the optimization of the gas condition and the pattern of the rear phosphor layer is suggested as a good alternative of daylight lamp source

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