• 제목/요약/키워드: Seong Dae-Jung

검색결과 574건 처리시간 0.027초

차량을 이용한 터널조도 및 휘도 측정시스템 개발 (Development of the mobile measuring system for tunnel lighting luminance and illuminance)

  • 김동조;조덕수;정연성;석대일;정승균;이창모;남동훈;김훈
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2005년도 학술대회 논문집
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    • pp.51-55
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    • 2005
  • 터널은 밝기가 급변하는 장소로서 자동차 운전자가 터널 진입 시 도로의 상황이나 교통상황을 정확히 파악하여 안전하고 불안감 없이 도로를 통행 할 수 있게 하여야 한다. 터널내의 충분한 노면휘도 유지를 위하여 터널내부의 조도를 정기적으로 측정하여야 하는데 기존의 수동식 측정법으로는 신속하고 신뢰적인 조도측정에 한계가 있다. 따라서 본 논문에서는 차량을 이용한 터널조도 및 휘도 측정시스템 개발과 함께 운용타당성에 대한 결과를 외국 사례와 함께 터널 실험을 통하여 결론을 도출하였다.

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Ethylene Oxide기를 갖는 Acrylate계 Gel Polymer Electrolyte의 전기화학적 특성에 관한 연구 (A Study on Electrochemical Properties of Acrylate-based Gel Polymer Electrolyte with Ethylene Oxide Group)

  • 김현수;신정한;문성인;오대희
    • 한국전기전자재료학회논문지
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    • 제17권6호
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    • pp.608-614
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    • 2004
  • The gel polymer electrolyte was prepared by radical polymerization using tetra(ethylene glycol) diacrylate and tri(ethylene glycol) dimethacrylate to investigate affect of the number of ethylene oxide. The gel polymer electrolyte showed good electrochemical stability up to 4.5 V vs. Li/Li and high ionic conductivity at various temperatures. The lithium-ion polymer batteries with the gel polymer electrolyte, tetra(ethylene glycol) diacrylate- and tri(ethylene glycol) dimethacrylate-based, also represented good electrochemical performances such as rate capability, low-temperature performances and cycleability. However, the cell with tri(ethylene glycol) dimethacrylate, which has three ethylene oxide, showed better electrochemical performance.

ICP 제논 램프의 가스 압력과 공급 전력에 따른 광학적 특성연구 (The Study on Optical Properties of Xenon ICP Lamp Dependently on Gas Pressure and Input Power)

  • 최기승;이성진;이종찬;박대희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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    • pp.1659-1660
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    • 2006
  • After end of the 20th environmental problem was became issue. So about mercury free lighting sources are being studied very much. In this paper, a mercury and electrode free bulb was designed. in this bulb was injected mixed of Xe, Ne and Kr Gases. and then the bulb was discharged by 13.56MHz RF Power after spectrum, color coordinates and brightness were measured by spectrum meter CS-1000. Measured results were compared and analyzed, also analysis was able to do a characteristic of a gas defensive fight in proportion to a mixing ratio. Therefore the most of high brightness which was 4500cd/m2 was gained in 1:1 ratio of Xe:Ne at 60W input power.

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전자코를 이용한 액취증의 진단 (Diagnosis of Osmidrosis Axillae Using Electronic Nose)

  • 김정도;장성진;임승주;박성대;김동진;김정주
    • 센서학회지
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    • 제22권4호
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    • pp.276-280
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    • 2013
  • The purpose of this paper is to diagnose osmidrosis visually and quantify the extent of osmidrosis. To achieve this, we designed the diagnosis method of osmidrosis using electronic nose system. The developed electronic nose system use principal component analysis for visualization of osmidrosis and fuzzy c-means algorithm for quantification. To confirm the efficiency of electronic nose system for osmidrosis diagnosis, we obtained samples from 34 volunteers and compared our experiment results with the doctor's diagnosis, and we met with successful results.

최적제어 이론을 이용한 유도전동기의 속도제어 (The Speed Control of Induction Motor Using Optimal Control Theory)

  • 김정욱;김대호;박성욱;이영석;서보혁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 D
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    • pp.2063-2065
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    • 2001
  • This paper presents speed control of a three-phase Induction Motor(I.M.) based on the optimal control theory. This technique is based on the optimal preview controller. The proposed technique comprises a new error system, vector control of the I.M. and the preview feedforwad control loop. Preview feedforward steps are introduced into the control law to enhance the transient response and to improve the robustness of the controlled system. Some computer simulation studies are carried out.

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