• Title/Summary/Keyword: light panel

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A study on the improvement of sound absorption coefficient of an honeycomb panel by the core resonance (코어공명을 이용한 허니콤패널의 흡음율 개선에 관한 연구)

  • Yu, Y.H.
    • Journal of Power System Engineering
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    • v.12 no.4
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    • pp.46-51
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    • 2008
  • Honeycomb panel has a constructive advantage because it is constructed with a honeycomb core, so it has relatively higher strength ratio to weight. Therefore honeycomb panel has been used as the light weight panels in the high-speed railway technology and high-speed ship like as cruise yachts. Also it has been used in the aircraft and aerospace industry as a structural panel because light weight structure is indispensible in that field of industry. Recently, the honeycomb panel is embossed in the viewpoints of high oil prices as the lightweight panel of the transport machine, however the sound insulation capacity of the honeycomb panel is poorer than those of uniform and another sandwich panels. In this paper a method to improving the sound absorption coefficient of a honeycomb panel Is studied by using the Helmholtz resonator. The sound absorption coefficients for some kinds of honeycomb cores are demonstrated by the normal incident absorption coefficient method.

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A Study on the acoustic characteristic of the Light weight Concrete Panel using bottom ash (Bottom ash를 이용한 경량판넬의 특성 연구)

  • Lee, S.H.;Jeong, G.C.;Chung, J.Y.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.05a
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    • pp.1379-1382
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    • 2006
  • Recently, the method of the apartment building design has been changed from wall type structures to moment structures. With like this reason dry walls are used plentifully. Especially, the gypsum board was used from previously plentifully however the weak point of it is difficult to maintain because it weak strength. For the improvement of gypsum board, light weight concrete panel using cement board is used recently. As this study is the research of the series t on the development of non-hearing light weight concrete Panel using bottom ash, the Purpose of this study is to obtain basic data for application in the field. The results are that the structure 1 satisfies domestic standard concerned with sound insulation between households at the laboratory and field test.

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A Study on the Acoustic Characteristic of the Light Weight Concrete Panel Using Bottom Ash (저회를 이용한 경량판넬의 특성 연구)

  • Jeong, G.C.;Chung, J.Y.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.2 s.119
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    • pp.149-154
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    • 2007
  • Recently, the method of the apartment building design is changing from wall type to moment structure. Dry walls are used plentifully. Until now, the gypsum board is used mainly but it has many problems. For improving the problems, the light weight concrete panel using cement board is used recently. The purpose of this study is to obtain basic data for the light weight concrete panel using bottom ash. As a result, some structures satisfies domestic standard concerned with sound insulation between households at the laboratory and field test.

Highly Stretchable, Transparent Ionic Touch Panel

  • Sun, Jeong-Yun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2017.05a
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    • pp.51-63
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    • 2017
  • The touch panel was developed decades ago and has become a popular input device in daily life. Because human-computer interaction is becoming more important, the next generation of touch panels require stretchability and bio-compatibility to allow integration with the human body. However, because most touch panels were developed based on stiff, brittle electrodes, electronic touch panels face difficulties to achieve such requirements. In this paper, for the first time, we demonstrate an ionic touch panel based on polyacrylamide hydrogel containing LiCl ions. The panel is soft and stretchable and thus, can sustain a large deformation. The panel can freely transmit light information through it because the hydrogel is transparent, with 99 % transmittance for visible light. A 1-dimensional touch strip was investigated to reveal the basic mechanism of sensing, and a 2-dimensional touch panel was developed to demonstrate its functionalities. The ionic touch panel was operated under high deformation with more than 1000% areal strain without sacrificing its functionalities. Furthermore, an epidermal touch panel on the skin was developed to demonstrate the mechanical and optical invisibility of the ionic touch panel through writing words, playing the piano and playing games.

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Monolithic Ambient-Light Sensor System on a Display Panel for Low Power Mobile Display (저 전력 휴대용 디스플레이를 위한 패널 일체형 광 센서 시스템)

  • Woo, Doo Hyung
    • Journal of the Institute of Electronics and Information Engineers
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    • v.53 no.11
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    • pp.48-55
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    • 2016
  • Ambient-light sensor system, which changes the brightness of a display as ambient light change, was studied to reduce the power consumption of the mobile applications such as note PC, tablet PC and smart phone. The ambient-light sensor system should be integrated on a display panel to improve the complexity and cost of mobile applications, so the ambient-light sensor and readout circuit was integrated on a display panel using low-temperature poly-silicon thin film transistors (LTPS-TFT). We proposed the new compensation method to correct the panel-to-panel variation of the ambient-light sensors, without additional equipment. We designed and investigated the new readout circuit with the proposed compensation method and the analog-to-digital converter for the final digital output of ambient light. The readout circuit has very simple structure and control timing to be integrated with LTPS-TFT, and the input luminance ranges from 10 to 10,000 lux. The readout rate is 100 Hz, and maximum differential non-uniformity with 20 levels of the final output below 0.5 LSB.

The Analysis of Effects of LED Panel Position and Lighting Angle on Communication Channel Quality in Indoor Visible Light Communication Systems (살내 가시광 무선 통신 시스템에서 LED 패널 위치 및 발광 각도가 통신 채널 품질에 미치는 영향 분석)

  • Do, Tronghop;Hwang, Jun-Ho;Yoo, Myung-Sik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.9B
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    • pp.1108-1116
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    • 2011
  • The visible light communication system that transmits data by controlling light emission of LED and receives data through photo detecter is considered as one of the strong candidates of the next generation wireless communication systems. The visible light communication provides both lighting and wireless communication wherever the LED lamps are installed. Due to the feature of visible light communication system, the communication is possible within the area that LED light reaches, and the communication quality depends on the light intensity received at the receiver. In this paper, we analyze the effects of LED panel position and lighting angel on communication channel quality in visible light communication systems. Through computer simulations, we prove that position of LED panel and light angle have a great impact on illuminance and SNR of the visible light communication systems.

Development of a LED BLU Tester Detecting the Errors of LCD Panels (LCD 패널의 불량을 검출하는 검사용 LED BLU 개발)

  • Kouh, Hoon-Joon;Jang, Kyung-Soo;Oh, Ju-Young
    • The Journal of the Korea Contents Association
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    • v.10 no.5
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    • pp.62-69
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    • 2010
  • LCD panel need BLU(Back Light Unit) that is outside source of light because can not emit light voluntarily. BLU is used in LCD module and is used in tester that examine LCD panel's badness. Lately, BLU had changed from CCFL(Cold Cathode Fluorescent Lamp) to LED(Light-Emitting Diode) fast. CCFL need extra-high tension power and produce much heat and is difficult to keep fixed brightness. LED is few electric power wastage and keeps fixed brightness. But, BLU that is used to detector that examine the LCD module is using CCFL until recently. This paper develops LED BLU that can examine LCD panel's badness. Also, this manufactures LED BLU to 24 inch size to examine all LCD panels(12~24 inch), and develops so that LED BLU may operate according to LCD panel's size.

Property of Thermal Conductivity of Light Weight Panel Core Using Light-Weight Aggregate (인공경량골재를 이용한 경량패널 심재의 열전도 특성)

  • 이정국;도정윤;문경주;조영국;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.131-136
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    • 2002
  • In recent year, it has been investigated on the reduction of mass of structures for the purpose of the larger space and the economy with the industry developing very fast and qualitatively. So the purpose of this study is to investigate the manufacture of light weight concrete panel using the artificial light-weight aggregate as a part of the substitution of foamed styrene and polyurethane because of narrow allocable temperature zone in use. The compressive strength, flexural strength, unit weight, absorption test and thermal conductivity were practised at 3, 7 and 28 days after manufacturing the light-weight concrete lot the panel core: the filling ratio of continuous void was defied as 40%, 50%, and 60% and water-cement rate was 35, 40 and 45%. As a result of this, it was revealed that the mixture derived from filling ration of void of 50% and water-cement ratio 40% were developing the best properties of the others.

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The three-dimensional measurement and analysis for 828nm light emitted from plasma display panel by scanned point detecting method(SPDM) (Scanned point detecting method(SPDM)에 의한 플라즈마 디스플레이 패널의 828nm 광에 대한 3차원 측정과 해석)

  • 최훈영;정재완;이승걸;이석현
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.284-287
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    • 2000
  • We analyzed the 3-dimensional discharge characteristic in plasma display panel(PDP) cell using the 3-dimensional emission distribution of 828nm light measured by scanned point detecting method(SPDM). The emitted light distributions on the ITO electrode show the stronger light intensity near to the electrode gap than outside. Also, 828nm light is widely detected outside of the bus electrode. We consider that measurement using new SPDM is effective to analyze the discharge physics and propose the new panel structures.

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A new method for monitoring an OLED panel for lighting by sensing the wave-guided light

  • Han, Jun-Han;Moon, Jaehyun;Shin, Jin-Wook;Joo, Chul Woong;Cho, Doo-Hee;Hwang, Joohyun;Huh, Jin Woo;Chu, Hye Yong;Lee, Jeong-Ik
    • Journal of Information Display
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    • v.13 no.3
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    • pp.119-123
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    • 2012
  • In this work, we report on a new monitoring method for an organic light-emitting diode (OLED) panel for lighting by optical sensing of the wave-guided light in the substrate. Using microlens array films, the wave-guided light was extracted into the edge or back side of the panel to be monitored by a photodiode. The luminance of the extracted light was measured as linearly proportional to the front light. Thus, by converting the extracted light into photo voltage, monitoring the luminance change occurring in the OLED is possible. Based on the results and concepts, we have proposed a photodiode-equipped driving circuit which can generate compensated driving current for uniform luminance of OLED panels.