• Title/Summary/Keyword: Optical Code

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Studies about Visible Light Distribution in PDP Cells with 3-dimesional Optical Code

  • Eom, Chul-Whan;Kang, Jung-Won
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.582-584
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    • 2007
  • In order to improve the accuracy of simulated results, new UV source was designed. Previously the optical simulation was performed with the symmetric planar UV source. To design new UV source, UV distribution from the plasma fluid code was implanted to the 3-dimensional optical code to generate the visible light distribution. The results from planar UV source and new UV source were compared with the ICCD (Intensified CCD) image in real PDP cell and analyzed the variation of geometries and optical properties.

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A Study of Optical Properties of Assembled Plasma Display Panel with 3-D Optical Code

  • Park, Hyun-Myung;Kang, Jungwon
    • Journal of the Semiconductor & Display Technology
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    • v.11 no.1
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    • pp.67-71
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    • 2012
  • The optical properties of PDP, such as the transmittance and reflectance, were analyzed with 3D optical code. Three different ITO-less structures in the front panel are examined. In the assembled panel study, the test 1 structure shows 16.6% and 10.2% higher reflectance than the structures of tests 2 and 3, respectively. In order to check the validation of the simulation result, three 7.5-inch test panels having the same geometry and property are fabricated as simulation models. The calculated reflective properties are compared to the measured data from real panels. The relative difference extracted from the simulation and measurement methods is less than 4.9% and are well matched.

Improvement of the Accuracy of Optical Simulation Using by the Multi-cube UV Source in PDP Cells (Multi-cube UV source 이용한 PDP에서 광학시뮬레이션의 정확성 개선에 관한 연구)

  • Kang, Jung-Won;Eom, Chul-Whan
    • Journal of the Semiconductor & Display Technology
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    • v.6 no.2
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    • pp.41-44
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    • 2007
  • Optical simulation of the rear and front panel geometries were needed to improve the luminance and efficiency in PDP cells. The 3-dimensional optical code can be used to analyze the variation of geometries and changing of optical properties. In order to improve the accuracy of simulated results, a new UV source, called a multi-cubes UV source, was designed. To design the source, at first UV distribution was calculated with the plasma fluid code and then the UV distribution was transformed to the multi-cube structures in the optical code. Compared to the results from existing UV source, called a planar UV source, could be improved the accuracy of visible light distribution. Simulated results were also compared to the visible distribution measured with the ICCD in a real PDP cell.

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A Study of Optical Property in PDP Using 3D Optical Code (3차원 광학시뮬레이션을 사용한 PDP의 광학적 특성에 관한 연구)

  • Kang, Jung-Won;Park, Hyun-Myung
    • Journal of the Semiconductor & Display Technology
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    • v.9 no.3
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    • pp.71-74
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    • 2010
  • In this study the optical properties, such as relative transmittance and reflectance of PDP were analyzed with 3D optical code. Because of the electrode structure, the reference model shows 21.3 % higher transmittance than the test model and the reference model shows 16.6 % higher reflectance than the test model. The calculated reflectance of reference and test models is compared to the measured reflectance and the difference between calculation and measurement is 4.9 %.

광학 시뮬레이션을 통한 PDP cell 구조의 최적화

  • Jeong Seon-Uk;Choe Hye-Rim;Gang Jeong-Won
    • Proceedings of the Korean Society Of Semiconductor Equipment Technology
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    • pp.160-163
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    • 2006
  • 고정세 PDP에서 방전 cell의 휘도와 효율을 증가시키기 위해서는 cell을 구성하고 있는 layer의 광학 성질과 구조를 고려한 설계가 필요하다. 3-dimensional optical code를 사용한 새로운 접근 방법은 다양한 geometry의 구성, 광학 성질의 적용의 용이함, 정확한 분석 데이터 등의 장점을 활용하여 PDP cell의 구조와 재료 변화에 따른 광 패턴과 조도 ($1m/mm^2$)를 관찰함으로써 향상된 휘도와 효율 특성을 갖는 cell 구조를 설계할 수 있게 된다. 본 논문은 PDP 상판을 구성하는 ITO, bus electrode, dielectric layer의 구조와 광학특성을 변화 시키고, 현재 양산 모델에 적용중인 다양한 상판 구조를 optical code를 활용하여 연산하여 도출된 결과를 비교하였다.

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Two-Dimensional Symmetric Balance Incomplete Block Design Codes for Small Input Power (작은 입력신호를 위한 Two-Dimensional Symmetric Balance Incomplete Block Design Code)

  • Jhee, Yoon Kyoo
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.5
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    • pp.121-127
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    • 2013
  • When input power is small, nonideal symmetric balance incomplete block design(BIBD) code design is effective in the spectral-amplitude-code(SAC) optical code-division multiple-access (OCDMA) system. But the number of simultaneous users is not sufficient. To overcome this property, we propose 2-D BIBD codes, where nonideal BIBD codes are used as spectral code and ideal BIBD codes are used as spatial codes. Analytical results show that the number of simultaneous users increases significantly.

Info-Convergence Ceramic Nanosystems

  • Jin, Wenji;Park, Dae-Hwan
    • Journal of the Korean Ceramic Society
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    • v.56 no.5
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    • pp.421-434
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    • 2019
  • We face many fascinating and diverse challenges, the most important among which is to determine how to store a large amount of information with novel approaches. Info-convergence ceramic nanosystems, which combine ceramic materials science and information technology, may provide an attractive alternative. This review considers recent multidisciplinary advances in the development of info-convergence nanosystems based on ceramic materials and discusses various strategies under ceramic-based information systems with a special focus on materials and nanohybridization technologies. Ceramic materials have played diverse roles not only as the generic coding support, but also as the central coding substance. The review highlights the ceramic nanohybrid bio code and ceramic nanoparticle optical code for applications in tracking-and-traceability management, nano-forensics, anti-counterfeiting, and even communication, as well as the four steps of encoding, encrypting, decrypting, and decoding for the desired applications. Additionally, associated challenges, potential solutions, and perspectives for future developments in the field are discussed.

Optimization of Geometries in PDP Cell by Optical Simulation (광학 시뮬레이션을 통한 PDP cell 구조의 최적화)

  • Jung, Sun-Wook;Choi, Hye-Rim;Kang, Jung-Won
    • Journal of the Semiconductor & Display Technology
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    • v.5 no.2
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    • pp.7-10
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    • 2006
  • The detailed studies regarding to the front and rear panel geometries of plasma display were needed to improve the luminance and efficiency. In plasma displays, 3-dimensional optical code can be used to analyze the variation of geometries and the changing of optical properties. The visible light distributions and illuminance were simulated depending on bus electrode position, ITO geometries, and alteration of dielectric layer's properties. This paper is concerned with development of a cell having high luminance and high efficiency for optical simulation. And the result of values could be expected to the application of real POP cell.

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Design and Simulation of Two-Dimensional OCDMA En/Decoder Composed of Double Ring Add/Drop Filters and Delay Waveguides

  • Chung, Youngchul
    • Journal of the Optical Society of Korea
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    • v.20 no.2
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    • pp.257-262
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    • 2016
  • A two-dimensional optical code division multiple access (OCDMA) en/decoder composed of four double-ring resonator add/drop filters and three delay waveguides is designed, and a transfer matrix method combined with fast Fourier transform is implemented to provide numerical simulations for the en/decoder. The auto-correlation peak level over the maximum cross-correlation level is larger than 3 at the center of the correctly decoded pulse for most of wavelength hopping and spectral phase code combinations, which assures the BER lower than 10-3 which corresponds to the forward error correction limit.

Multi-Rate and Multi-BEP Transmission Scheme Using Adaptive Overlapping Pulse-Position Modulator and Power Controller in Optical CDMA Systems

  • Miyazawa Takaya;Sasase Iwao
    • Journal of Communications and Networks
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    • v.7 no.4
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    • pp.462-470
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    • 2005
  • We propose a multi-rate and multi-BEP transmission scheme using adaptive overlapping pulse-position modulator (OPPM) and optical power controller in optical code division multiple access (CDMA) networks. The proposed system achieves the multi-rate and multi-BEP transmission by accommodating users with different values of OPPM parameter and transmitted power in the same network. The proposed scheme has advantages that the system is not required to change the code length and number of weight depending on the required bit rate of a user and the difference of bit rates does not have so much effect on the bit error probabilities (BEPs). Moreover, the difference of transmitted powers does not cause the change of bit rate. We analyze the BEPs of the four multimedia service classes corresponding to the com­binations of high/low-rates and low/high-BEPs and show that the proposed scheme can easily achieve distinct differentiation of the service classes with the simple system configuration.