• Title/Summary/Keyword: 황명근

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Lighting Design for Efficient Installation.Operation of Roadway Lighting (도로조명의 효율적 설치.운영을 위한 조명설계)

  • Kwon, Ki-Tae;Shin, Sang-Wuk;Lee, Se-Hyun;Rho, Jae-Yup;Choi, Seok-Joon;Lee, Jeong-Keun;Seo, Jeong-Jin;Lee, Gyu-Seoung;Hwang, Myung-Keun
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.10a
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    • pp.81-84
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    • 2009
  • 국내외 도로조명 설계기법을 조사, 분석한 것을 바탕으로 시뮬레이션 결과와 비교 검토하였다. 그 결과 평균조도값은 설계와 큰 차이를 가지고 있지 않았지만 지그제그 배열일 경우 종합균제도 및 차선축균제도가 규정에 만족시기지 못하였다.

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Electroluminescent and Accelerated Aging Properties of ZnS:Cu Phosphor (ZnS:Cu 형광체의 전계 발광 및 가속열화 특성)

  • 이종찬;황명근;박대희
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2001.11a
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    • pp.13-16
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    • 2001
  • In this paper, the emission and aging properties of ZnS:Cu electroluminescent device were experiment respectively at room temperature and 7$0^{\circ}C$ relative humidity 100%. ZnS:Cu and BaTiO$_3$were respectively used for phosphor and dielectric. While AC 100V on 400Hz frequency were applied to the devices at room temperature and 70$_3$relative humidity 100%, the change of brightness were measured and compared. The surface of aged devices were investigated by scanning electron microscope. With the continuously operated environment of room temperature and 7$0^{\circ}C$ relative humidity 100%, the decay time were measured and the dark spot and aging status on the surface of the device were investigated. ZnS:Cu electroluminescent properties were deteriorated by the Increased temperature and humidity. Also the deteriorated properties were confirmed by the brightness and surface chanties of device, and the aging mechanism from the simulation on sulfur vacancy and deep tracts density.

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The Study of Measurement Method for an electrodeless lamp (무전극 램프의 광특성 측정방식에 대한 고찰)

  • Lee, Se-Hyun;Cho, Mee-Ryoung;Shin, Sang-Wuk;Hwang, Myung-Keun
    • Proceedings of the KIEE Conference
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    • 2003.10a
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    • pp.68-71
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    • 2003
  • In this paper, We have investigated the luminous flux, luminous efficacy, spectral energy distribution, colour rendering index, correlated colour temperature of electrodeless QL lamp system as a center method of measurement and side method of measurement. A result of measurement is that center method of measurement and side method of measurement is almost similar. Therefore, Sample that didn't measured because of big size and heavy weight can be measured by center method of measurement.

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A Study on Ceramic Arc-tube Metal Halide Lamp for 70W Class (70W급 세라믹 아크튜브에 관한 연구)

  • Shin, Sang-Wuk;Lee, Se-Hyun;Cho, Mee-Ryoung;Hwang, Myung-Keun;Yi, Chin-Woo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.148-151
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    • 2007
  • 최근 들어 메탈핼라이드램프의 아크튜브에 석영관을 대신하여 세라믹(Ceratmic)을 이용하는 기술이 개발되었으며, 이는 탁월한 내열성 및 내식성으로 메탈헬라이드램프로 하여금 우수한 색온도 및 연색성 유지특성을 가질 수 있게 하였다. 본 논문는 국내의 차세대 세라믹 아크튜브 메탈핼라이드램프(Ceratmic Metal Halide lamp) 개발에 필요한 국외의 70W급 제품에 적용되는 세라믹 아크튜브에 대한 특성 분석을 통해 새로운 고효율, 장수명의 세라믹 메탈 핼라이드램프의 개발에 도움을 주고자 한다.

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A Study for Development of Lighting Industry for Accede to The Environment Restriction (환경규제에 따른 조명산업 발전방안 연구)

  • Hwang, Myung-Keun;Jang, Woo-Jin;Yang, Seong-Yong
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.160-165
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    • 2007
  • 형광램프와 HID(high intensity discharge)램프는 수은(Hg)에 의해 빛을 방사한다. 산업환경의 변화속에서 침체기를 맞고 있는 국내 조명산업이 내부적으로는 친환경 조명제품 개발에 주력하고 외부적으로는 환경규제로 인한 피해를 최소화시킴과 동시에 적극적인 세계시장공략으로 고부가가치산업으로 성장할 수 있도록 조명분야의 환경규제 동향을 조사하여 조명산업 전반에 널리 홍보함으로써 국내 조명산업의 지속적인 경쟁력 및 성장가능성 확보에 목적을 두고 있다. 선진국을 중심으로 제도화되고 있는 환경규제(RoHS. WEEE 등)에 따른 문제점과 예상 영향(피해)도를 조사, 분석하여 시기적절한 효율적인 발전방안을 모색함으로써 국내 조명산업의 지속적인 경쟁력 및 성장가능성 확보를 위한 조명산업 발전방안 제시에 목적을 두고 있다.

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Optical and Performance Characteristics Analysis of LED Light Source (조명용 LED광원의 광학적특성 평가 및 성능 분석)

  • Hwang, Myung-Keun;Shin, Sang-Wuk;Cho, Mee-Ryoung;Lee, Se-Hyun;Lee, Young-Joo;Kim, Jin-Sheon
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.170-173
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    • 2007
  • 본 논문에서는 LED광원에서 현재 가장 많이 사용되는 MR과 PAR 타입의 램프를 측정 분석하였다. 최대광도 및 광속의 측정값을 비교 분석하였다. 그러나 MR 16 및 PAR 30의 경우 관련 KS 규격상에 광속에 대한 값을 명기하고 있지 않은데 이것은 램프 뒤쪽에 반사경(다이크로익 미러)이 부착되어 있어 가시광을 일정한 방향으로 집중시키는 투광 개념의 광원이므로 광속 측정의 의미가 필요하지 않아서 인 것으로 생각된다. LED광원의 경우 LED자체의 광 확산이 매우 광범위하고, 반사경의 영향을 적게 받고 있어 사이드 방식으로 측정된 상기의 광속값은 불확도 범위이내에 존재할 것이 확실시되므로 향후 LED관련 규격의 제안시 측정이 요구될 것으로 판단된다.

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A Study on Optics and Spectral Energy Distribution Characteristics of LEDs lamp (LED램프의 광학 및 분광분포 특성 연구)

  • Hwang, Myung-Keun;Huh, Chang-Su
    • Journal of the Korean Solar Energy Society
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    • v.23 no.1
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    • pp.68-75
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    • 2003
  • 본 논문에서는 파랑, 녹색, 호박색 빨강색, 백색 등 고휘도 5mm LED(light emitting diode)의 기본적인 분광분포(SED: spectral energy distribution) 특성을 분석하였으며, LED램프의 중요한 광학 특성인 광속, 효율 피크 파장$({\lambda}p)$, 가중치 평균 파장, 반치폭(FWHM, $\Delta\lambda$), 색도좌표, 주 파장, 자극순도(Pe)와 휘도순도(Pc) 등을 측정 및 실험하였다. 제시된 LED램프의 특성 데이터는 앞으로 LED램프를 사용한 새로운 조명등기구를 개발하는데 많은 도움을 줄 것이며, 이러한 측정 데이터들은 조명용 광원으로서 LED램프의 사용 대체 가능성을 나타낸다.

The Effects of Environmental Factors on Degradation and Hydrophobicity Recovery Characteristics in RTV Silicone Rubber (RTV 실리콘 고무의 열화 및 발수성 회복 특성에 미치는 환경인자의 영향)

  • Heo, Chang-Su;Yeon, Bok-Hui;Jo, Hyeon-Uk;Hwang, Myeong-Geun
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.6
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    • pp.462-468
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    • 1999
  • Room temperature vulcanizing (RTV) silicone rubber has been widely used to coat porcelain insulators to render water repellency to prevent formation of water film on the surface and thus to suppress the leakage current and consequently flashover. However, the electrical property and the hydrophobicity of RTV silicone rubber coating under outdoor condition may be influenced by many environmental factors. In this studyvarious treatments, such as salt-fog, salt water immerging and UV irradiation were applied to the samples to investigate the change of the electrical property and hydrophobicity. As a result the leakage current increased and contact angle decreased asthe degradation time is longer. But the degraded RTV silicone rubber has recovered its hydrophobicity during the drying time in ambient condition because LMW(Low Molecular Weight) silicone fluid diffused from the bulk to the surface.

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Effect of Filler and Additive on Performance of Cycloaliphatic Epoxy used for Outdoor Insulators (싸이클로알리파틱 에폭시 절연재료의 옥외 성능에 미치는 층전재 및 첨가물의 영향)

  • 허창수;연복희;서유진;이기택;김남렬;황명근;김완태
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07a
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    • pp.431-434
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    • 2002
  • This paper reports on the evaluation of weathering resistance, tracking test and salt-fog of various kinds of cycloaliphatic epoxy systems. It was found that UV irradiation induced the loss of hydrophobic level due to the chain scission attack at the surface. It could be seen that samples containing an UV absorbent/antioxidant and a silicone oil additive knave a good performance in weathering ageing, whereas ATH filled ones have high resistance against tracking failure than others. Under salt-fog test, specimens mixed with silicone oil could suppress leakage current development. It was thought that silicone oil mixed into cycloaliphatic epoxy system could lead to lower the surface energy and to retain hydrophobic properties for a long time, which are desirable for outdoor performances.

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The National and International Standards of LED BLU (LED 백라이트유닛(BLU)의 국내외 표준화)

  • Cho, M.R.;Jeon, S.K.;Shin, S.W.;Lee, S.H.;Noh, J.Y.;Choi, S.J.;Hwang, M.K.;Lee, D.Y.;Yang, S.Y.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.05a
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    • pp.222-224
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    • 2008
  • BLUs(Backlight Units) are major component in LCD(Liquid Crystal Display) industry which occupies 90% or more of worldwide FPD(Flat Panel Display) market. And BLU market is expected to be expanded continuously according to the trend of miniaturization, slimness, low power consumption and low weight. The larger the BLU market scale, the more important standardization of performance evaluation techniques to clearly prescribe the product specification. This document is a generic specification of measurement methods of LED BLU for LCDs. It defines general procedures for quality assessment and gives general rules for measuring methods of LED BLU for LCDs.

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