• Title/Summary/Keyword: 확산반사

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A Novel Design of an Integrated Light Guide Plate (복합패턴을 이용한 도광판 설계)

  • Sin, Du-Sik;Lee, Jun-Ho;Lee, Chi-Won;Jang, Won-Seok;Yu, Yeong-Eun;Choe, Du-Seon
    • Proceedings of the Optical Society of Korea Conference
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    • 2008.02a
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    • pp.265-266
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    • 2008
  • 본 논문은 기존 도광판에 복합화된 마이크로 패턴을 이용하여 휴대폰용 LCD Backlight Unit의 설계 및 해석에 대한 연구이다. 현재 상용 시제품의 도광판 패턴에 복합된 마이크로 패턴을 이용하여 광학시트를 줄이는 것을 목표로 진행 하였다. 도광판의 윗면에 프리즘형상을 설계 하였고, 아랫면은 기존의 패턴에 마이크로 패턴을 형성하였다. 마이크로 패턴의 형상은 구면, 프리즘, 실린더로 각 형상에 대해 변수를 바꾸어 가며 최적의 설계 값을 찾아보았다. 설계된 복합패턴으로 기존 Backlight Unit의 구성품인 반사판, 도광판, 확산판, BEF를 반사판과 도광판 만으로도 대체 할 수 있음을 시뮬레이션을 통해 확인하였다.

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LED Source Optimization for the LED Chip Array of the LED Luminaires (LED 조명기구에서 LED 칩 배치에 따른 광원 최적화)

  • Yoon, Seok-Beom;Chang, Eun-Young
    • Journal of Digital Convergence
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    • v.14 no.4
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    • pp.419-424
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    • 2016
  • In this paper, we studied a light distribution for the LED chips arrangement using an optical design software. The structures of the edge type LED luminaires are reflector plane, LGP(lighting guide plane) and diffuse plane. The reflector plane is on the middle of the overall structure. We had simulation that placing LED chips on the reflector center of the reflector edge by changing the position of LED chips above the reflector center at 1mm, 2mm, and 3mm respectively. In the case, when LED chips are on the center of the reflector, it shows the light distribution of the general diffuse illumination, the semi-direct distribution with 0.56 efficiency and the direct distribution with 0.31 efficiency. And the wedge type LGP shows more efficiency than the flat type. Gradually increasing shape of semi-spherical type by 0.015mm has power of 1.02W, efficiency of 0.25, and maximum luminous intensity of 0.104W/sr, it also and shows the better optical characteristics than the reflector plane that have no patterns. This semi-spherical type shows the better optical characteristics than the reflector plane that have no patterns.

Effect of Diffuser Locations on the Room Acoustical Parameters in 1:25 Scale Model Hall (1:25 축소모형 홀에서 확산체의 설치부위에 따른 실내 음향지표의 변화)

  • Kim, Yong-Hee;Seo, Choon-Ki;Lee, Hye-Mi;Jeon, Jin-Yong
    • The Journal of the Acoustical Society of Korea
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    • v.31 no.3
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    • pp.115-128
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    • 2012
  • This paper investigates the effects of diffuser on the acoustical parameters in music hall with consideration of the result of scattering coefficient measurement. A scale model hall of 600 seats with orchestra shell was used for experiments. The materials of 1:50 scale model was chosen through absorption coefficient measurement based on ISO 354. The model was matched to the computer simulation model in terms of reverberation time. In order to evaluate the effect of diffuser location, the measurements were accomplished with and without diffusers according to 7 configurations by diffuser-installed region; sidewall, balcony front, ceiling and so on. The following acoustical parameters were extracted from each measurement case; Reverberation time (RT), Early decay time (EDT), Clarity (C80), Center time (Ts), Sound strength (G) and Temporal diffusion (TD) from the auto-correlation function (ACF) of impulse responses. As a result, the absorption power and diffusion power were increased with number of diffusers. Accordingly RT, EDT and G were decreased by diffuser and the redirection of reflections was occurred briskly. Averaged TD was 6.05 to 6.30 by measurement cases. RT was found to be the most related factor to diffusion power (R = 0.94). The correlation between TD and EDT was high (R = 0.73). In addition, the effects of diffuser-installed location were discussed in terms of acoustical parameter variation.

Effect of Text Transmission Performance on Delay Spread by Water Surface Fluctuation in Underwater Multipath Channel (수중 다중경로 채널에서 수면변동에 의한 지연확산이 텍스트 전송성능에 미치는 영향)

  • Park, Ji-Hyun;Kim, Jong-Wook;Yoon, Jong-Rak
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.48 no.1
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    • pp.1-8
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    • 2011
  • In this paper, a water tank experiment using Binary Frequency Shift Keying (BFSK) method for text transmission performance by water surface fluctuation is conducted. Water surface fluctuation and delay spread which affect the channel coherence bandwidth is a limiting factor in underwater acoustic communication. The amplitude fluctuation and delay spread the smooth surface and fluctuation surface, were identified. The effective delay spread of both cases are 5ms, 4ms corresponding to the coherence bandwidth of 200Hz, 250Hz, respectively. The bit error rate of BFSK modulated text transmission is about $10^{-4}$ in less than 200bps in smooth surface but less than 250bps in fluctuation surface. Therefore, this experiment shows that the water surface fluctuation is important factor determining the performance of the underwater acoustic transmission.

Investigation Into Reflectance Characteristics of Trees Infected by Pine Wilt Disease (소나무재선충병 감염목의 분광반사 특성 구명)

  • Kim, So-Ra;Lee, Woo-Kyun;Nam, Kijun;Song, Yongho;Yu, Hangnan;Kim, Moon-Il;Lee, Jong-Yeol;Lee, Seung-Ho
    • Journal of Korean Society of Forest Science
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    • v.102 no.4
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    • pp.499-505
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    • 2013
  • Pine wilt disease has known as a serious forest disease in East Asia such as Japan, Korea and China. Fumigation and burning are considered as best way to treat infected tree at early detection. For investigate spectral reflectance characteristics of infected trees, periodic measurement has been done in both infected and non-infected trees. Infected and non-infected trees' reflectance (400 nm~2,500 nm wavelength) are detected from June to October with GER3700 spectrometer. Noise of reflectance data was corrected using cubic spline interpolation method. Reflectance was changed in most of infected trees with ranges Red (600 nm~700 nm) and Middle Infrared (1,400 nm~1,500 nm) within two months after injected by Pine Wood nematode (PWN), but there was no differences in non-infected trees. Infected and non-infected trees were compared statistically in each period. As a result, we found that a statistically significant difference was occurred at Red and Middle Infrared (MIR) 2 months after injection (p<0.05), however, no significant difference in near infrared (p>0.05). Therefore, the early detection of infested pine trees by PWN may possible through detecting the change of spectral reflectance at red and MIR.

Evaluation of the Scar Treatment using Near Infrared Diffuse Reflectance Spectroscopy (근적외선 확산반사 분광법을 이용한 흉터치료 평가)

  • Jang, I.J.;Youn, Jong-In
    • Journal of Biomedical Engineering Research
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    • v.37 no.1
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    • pp.53-60
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    • 2016
  • Monitoring of dermal collagen is important to assess various scar conditions, and many diagnostic methods have been applied to quantify collagen contents in scar tissue. In this study, Monte Carlo simulation was used to evaluate diffuse reflectance distributions in scar condition by a near-infrared laser source. The results showed that the effective distance of the light source and the detector was 2 mm to monitor the various scar conditions using diffuse reflectance spectroscopy. This study may suggest to the optimal design for a near infrared diffuse reflectance spectroscopy during the scar treatment.

Market Trend of PET & Nylon Film (PET 및 NYLON 필름 시장 동향)

  • Korea Packaging Association INC.
    • The monthly packaging world
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    • s.172
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    • pp.61-65
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    • 2007
  • 디스플레이용 PET필름 시장이 활황을 띌 것으로 보인다. 디스플레이용 PET필름은 확산.보호.반사 필름, 프리즘시트 등 LCD 광학필름의 원재료 격으로 국내 시장(세계약 40% 추정)은 LCD TV 등의 확산에 힘입어 올해 약 32% 정도의 고성장이 예상되고 있다. 그동안 포장재.비디오테이프∙전자부품 등 범용 PET필름 생산에 주력했던 SKC.코오롱.도레이새한 등 주요 화학.섬유 업체들이 LCD광학필름 제조에 필요한 디스플레이용 PET 필름의 생산 인프라를 확대하거나 새롭게 구축하기 시작한 것이다. 특히 그동안 기존 범용 PET 필름 생산라인의 일부를 이용해 생산했던 방식에서 탈피해 디스플레이 전용 라인을 신설, 향후 지속적인 수요확대에 대응한다는 전략을 구체화하고 있어 주목된다. 본 고에서는 (사)한국포장협회 회원사를 대상으로 조사한 내용을 바탕으로 업체별 PET 및 Nylon 시장을 살펴보도록 하겠다.

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Directional Irregular Wave Generation with Side Wall Reflection (측면 반사를 고려한 다방향 불규칙파 생성)

  • 양찬규;홍기용;홍석원;최학선
    • Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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    • 1997.10a
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    • pp.53-57
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    • 1997
  • 해양파는 해양구조물에 작용하는 주된 외력이고, 쇄파와 물질의 확산등 해양의 역학적 현상을 유발하며, 표사와 누유의 이동등 물질유동의 원인이 된다. 이러한 이유 때문에 정확한 해양파의 역학적 특성 및 재현기법에 대한 연구가 활발히 이루어져 왔다. Longet-Hggins(1975)와 Barber(1963)가 파의 방향분산성을 나타내는 방향스텍트럼 해석법을 제안한 이래 Mtsuyasu(1970)는 실해역 측정을 통해 Mitsuyasu형 방향분포함수 및 주파수 스펙트럼을 얻는 등 많은 심해역 파랑의 해석기법에 대한 연구가 꾸준히 진행되고 있다. (중략)

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Comparative Analysis of Methods for Implementing 3D Sound (입체 음향 구현을 위한 방법론의 비교 분석)

  • 이희종;김기홍;김풍민;김현빈
    • Proceedings of the Korean Society for Emotion and Sensibility Conference
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    • 1998.04a
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    • pp.212-216
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    • 1998
  • 청취자가 음원의 위치와 방향을 감지할 수 있도록 원하는 지점에 음상을 정위시키는 일과 특정 공간내에서 방사되는 음원의 반사와 확산효과를 모델링하여 가상 공간 음향을 실현하는 일을 효과적으로 접목시키기 위한 3가지 유형의 입체음향 생성방법을 제시한다. 그리고 각 방법의 유효성 및 적합성을 검토하기 위해 실시한 심리음향 평가방법과 그에 대한 결과를 토대로 생성발법들간의 성능을 비교 평가한다.

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