• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.779-782
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• 2004

Establishing and maintaining optimum lamp operating temperature is critically important in backlight systems for large area displays. The information presented in this paper is based upon work completed for a tiled 37.5" AM LCD, plus projections for a 37.5", 42" & 50" monolithic display. Due to the size of the units, a requirement for highly collimated light and a requirement for high brightness, >550 nits at the display surface, significant wattage is required which generates high heat levels in the backlight display assembly and potentially, at the display rear surface. Uniformity of illumination becomes an important element in the system design because of the large area involved.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.386-389
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• 2006

The sea surface wind speed (SSWS) derived by microwave radiometer can be contaminated by change of microwave brightness temperature owing to the angle between the sensor azimuth and the wind direction (Relative Wind Direction). We attempt to correct the contamination to the SSWS derived by Advanced Microwave Scanning Radiometer (AMSR) on Advanced Earth Observing Satellite II (ADEOS-II), by applying the method proposed by Konda and Shibata (2004). The improvement of accuracy of the SSWS estimation amounts to roughly 60% of the error caused by the RWD effect.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.39-42
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• 2003

Low temperature polysilicon (LTPS) TFT LCOs are in production today at sizes ranging from 0.33" for Viewfinders to 17" for LCD TVs with 21.3" recently demonstrated. Because of their form factor, resolution, brightness and other benefits, LTPS TFT LCD unit shipments, revenues and capacity are expected to grow rapidly, particularly for mobile applications. However, despite the strong outlook, LTPS TFT LCOs are still faced with numerous challenges from a market and technology perspective. LTPS TFT LCD producers were surveyed on which of the current challenges were the most problematic among other questions.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.913-914
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• 2006

Amorphous diamond has a very low work function (1 eV) at modest temperature ($150^{\circ}C$). It has been coat coated on electron emitting electrodes. Such electrodes are used for cold cathode fluorescence lamps (CCFL) that illuminate liquid crystal displays (LCD) for rnote books and television sets. Amorphous diamond can dramatically reduce the turn-on voltage to lit CCFL so the lamp life can be greatly extended. Moreover, the electrical current can be increased to enhance the brightness of the light.

• 천문학회보
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• 제45권1호
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• pp.47.2-47.2
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• 2020

The Experiment to Detect the Global EoR Signature (EDGES) has probed the status of the early Universe through the global 21cm observation. The claimed (brightness temperature) of ~ 500 mK absorption dip at z~17 against the continuum background cannot be explained in the standard LambdaCDM framework. In the meantime, the Planck 2018 Legacy Data, especially the E-mode polarization power spectrum, puts rather strong constraints on the high-redshift reionization process. We show how these two observational contraints can be accomodated in a series of reionization scenarios, with a special focus on the strongly self-regulated reionization by first stars.

• 한국포장학회지
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• 제4권2호
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• pp.24-32
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• 1998

인쇄하지 않은 복사용지에 대해 침지, 탈수, 건조등 일련의 리사이클링 사이클의 반복횟수에 따라 얻어지는 재생지의 광학적 성질의 변화와, 리사이클링 횟수를 달리한 펄프를 이용하여 고지를 제조한 후 하여 고지의 탈묵성 변화를 살펴보았다. 그 결과, 리사이클링 횟수 증가에 따라 얻어진 재생지의 백색도는 원래보다 약10% 저하되었으나, 섬유간 결합감소에 따른 비산란계수의 증가로 불투명도는 약10%정도 증가하는 경향을 보였다. 또한, 리사이클링 횟수에 따른 고지의 탈묵성은 섬유의 표면 자유에너지 감소, 즉 섬유의 소수화 증가로 인하여 약간 저하되는 것으로 나타났다.

• 전자공학회논문지SC
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• 제45권2호
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• pp.1-7
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• 2008

본 논문에서는 원격 센싱이나 보안에 사용할 수 있는 밀리미터파 수동 이미징 센서를 제작하였다. 영상의 밝기 온도는 $3^{\circ}$의 분해능으로 안테나에서 측정된다. 제작한 센서는 PC에서 제어되며 pan/tilter 장치를 통해 빠른 성능을 얻는다. Pan/tilter 장치는 래스터 스캔을 통해서 2-D 영상을 스캔할 수 있다. 상하좌우로 기계적인 스캔에 의해서 $20{\times}20$ 픽셀의 영상은 400초 이내로 얻어진다. 영상은 측정 후 바로 표시되며 후처리를 위해 저장된다.

• 센서학회지
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• 제11권6호
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• pp.371-377
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• 2002

$Y_2O_3:Eu^{3+}$ and Li-doped $Y_2O_3:Eu^{3+}$ thin films have been grown on sapphire substrates using a pulsed laser deposition technique. The thin film phosphors were deposited at a substrate temperature of $600^{\circ}C$ under the oxygen pressure of 100, 200 and 300 mTorr. The films grown under different deposition conditions have been characterized using microstructural and luminescent measurements. The crystallinity and photoluminescence (PL) of the films are highly dependent on the oxygen pressure. The PL brightness data obtained from $Y_2O_3:Eu^{3+}$ films grown under optimized conditions have indicated that sapphire is one of the most promising substrate for the growth of high quality $Y_2O_3:Eu^{3+}$ thin film red phosphor. In particular, the incorporation of $Li^{+}$ ions into $Y_2O_3$ lattice could induce a remarkable increase of PL. The highest emission intensity was observed with LiF-doped $Y_{1.84}Li_{0.08}Eu_{0.08}O_3(Y_2O_3LiEu)$, whose brightness was increased by a factor of 2.7 in comparison with that of $Y_2O_3:Eu^{3+}$ films. This phosphor may promise for application to the flat panel displays.

• 한국염색가공학회지
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• 제15권1호
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• pp.39-47
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• 2003

Phosphorescent PET/liquid color films and phosphorescent PET/disperse dyes films were prepared by melt casting method using Hot press. Then, weight ratios and exhaustion percent of films were 0.7, 1.2, 1.5, 2.0, and 2.3 wt.%. The effects of L/C and D/D contents(wt.%) of films on the thermal properties, crystal structure, H(%), brightness$(mcd/mm^2)$, morphology, and tensile properties were investigated by means of DSC and WAXD, etc. It was found that the melting temperature and crystalline diffraction peaks were not changes with increasing the liquid color contents and disperse dyes exhaustion. Also, in case of using liquid color to phosphorescent PET film, the H(%) and brightness$(mcd/mm^2)$ value were superior to phos.PET/disperse dyes film. The tensile strength and the tensile modulus were decreased with increasing the contents of liquid color and exhaustion of disperse dyes in the phosphorescent PET film. Also, the elongation at break was increased with increasing the contents of liquid color and exhaustion of disperse dyes in the phosphorescent PET film.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 추계학술대회 논문집
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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