• Title/Summary/Keyword: White

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CONVOLUTIONS OF WHITE NOISE OPERATORS

  • Ji, Un-Cig;Kim, Young-Yi
    • Bulletin of the Korean Mathematical Society
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    • v.48 no.5
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    • pp.1003-1014
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    • 2011
  • Motivated by the convolution product of white noise functionals, we introduce a new notion of convolution products of white noise operators. Then we study several interesting relations between the convolution products and the quantum generalized Fourier-Mehler transforms, and study a quantum-classical correspondence.

BGR mixture phosphor for white-light-emitting diode of liquid crystal display backlight

  • Lee, Sung-Hoon;Park, Je-Hong;Seo, Kwang-Il;Kim, Jong-Su
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08b
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    • pp.1559-1560
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    • 2007
  • BGR mixture phosphor pumped by 400 nm is developed for white-light-emitting diode of liquid crystal display backlight. White-emitting phosphor is prepared by mixing $Ba_2SiO_4:Eu^{2+}$ and $(Ba,Sr)_3MgSi_2O_8:Eu^{2+},Mn^{2+}$ phosphors.

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Phase change on reflection considered of the polarization in white-light interferometer (백색광 주사 간섭계에서 편광을 고려한 반사시 위상 변화)

  • 김영식;김승우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.276-279
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    • 2003
  • The phase change upon reflection from target surfaces in white-light interferometer induces measurement errors when target surfaces are composed of dissimilar materials. We prove that this phase change on reflection considered of the polarization of the white-light causes the shift of both envelope peak position and fringe peak position of several tens of nanometer. In addition, we propose a new equation of white-light interference fringe pertinent to the polarization of source.

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Absolute Temperature Measurement using White Light Interferometry

  • Kim, Jeong-Gon
    • Journal of the Optical Society of Korea
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    • v.4 no.2
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    • pp.89-93
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    • 2000
  • Recently a new signal processing algorithm for white light interferometry was presented. In this paper, the proposed signal processing algorithm was applied for absolute temperature measurement using white light interferometry. Stability testing and absolute temperature measurement were demonstrated. Stability test demonstrated the feasibility of absolute temperature measurement with an accuracy of 0.015 fringe. The test also showed that the absolute temperature measurement system using white light interferometry is capable of obtaining the theoretical minimum detectable change (0.0005 fringe), which is consistent with the performance predicted by the proposed signal processing algorithm.

A new automatic white balance algorithm using non-linear gain (Non-linear gain을 적용한 Automatic White Balance기법)

  • Yun, Se-Hwan;Kim, Jin-Heon
    • Proceedings of the KIEE Conference
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    • 2006.04a
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    • pp.27-29
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    • 2006
  • In this paper, we propose a new method of automatic white balance which is one of the image signal processing techniques. Our method is conceptually based on gray world assumption. However, while previous methods generate linear results as multiplying pixel values by a gain, our method generates non-linear results using the feature of B-Spline curves. The two merits of deriving non-linear results are preventing AWB failure from transforming strong color of high level into wrong color and well preserving original contrast of an input image.

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Non-destructive management of white spot lesions by using tooth jewelry

  • Kim, Hee-Jin;Karanxha, Lorena;Park, Su-Jung
    • Restorative Dentistry and Endodontics
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    • v.37 no.4
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    • pp.236-239
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    • 2012
  • Although several methods including composite resin restoration and microabrasion have been used for management of white spot lesion, tooth jewelry can be considered as another noninvasive option. This case report describes the management of white spot lesions by using tooth jewelry. This report also highlights the patients' preference for tooth jewelry as an esthetic concern.

Morphological Characterization and Culture Conditions of A White Mutant of Ganoderma Iucidum (영지버섯 백색 변이주의 형태적 특성 및 최적 배양조건)

  • 조수묵;서건식;유승헌;유익동;신관철
    • Microbiology and Biotechnology Letters
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    • v.21 no.6
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    • pp.520-526
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    • 1993
  • A morphologically different form of Ganoderma lucidum was isolated from a cultivator's farm, and its optimum growth conditions were determined. A major difference in their morphology was color of fruit bodies. Fruit bodies of the mutant were white wherase those of normal Ganoderma lucidum were red. Spores of the mutant were global and mycelia were thin. Mycelial growth of this white mutant was favorable on potato sucrose agar medium, and optimum pH of the medium was 5.5.

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Black-white Reflective Liquid Crystal Display Prepared with Two Color Reflective Layers

  • Choi, Woon-Seop;Kim, Min-Kyu
    • Transactions on Electrical and Electronic Materials
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    • v.10 no.1
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    • pp.20-23
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    • 2009
  • Black-white reflective cholesteric liquid crystal display was prepared with two color liquid crystal layers, the combination of yellow color liquid crystal and blue color liquid crystal. The rubbing of cholesteric liquid crystal panel affects the brightness and color spectrum due to increase the planar domain texture. The CIE chromaticity coordinate of white is (0.31, 0.31).

White-Light-Emitting Molecule

  • Park, Soo-Young;Park, Sang-Hyuk
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.481-481
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    • 2009
  • For a new generation of white light sources, we present the first example of a concentration-independent ultimate white-light-emitting molecule based on excited-state intramolecular proton transfer materials. Our molecule is composed of covalently linked blue- and orange-light-emitting moieties between which energy transfer is entirely frustrated, leading to the production of reproducible, stable white photo- and electroluminescence.

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Recent Progress in the Development of Organometallic Complexes, Inorganic Phosphors and Quantum Dots for White Light Emitting Devices

  • Raja, Inam ul Haq;Lee, So-Ha
    • Journal of the Korean Applied Science and Technology
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    • v.25 no.2
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    • pp.175-195
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    • 2008
  • Recent years have brought remarkable developments in white light emitting devices (WLEDs) and white organic light-emitting devices (WOLEDs). However, their efficiency, CIE values, CRI and lifetime are still not ideal. This review covers detailed discussion about syntheses of organometallic complexes, inorganic phosphors and quantum dots used in WLEDs, WOLEDs and their electroluminescent properties until December 2007.