• Title/Summary/Keyword: Matrix degradation

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Thin Film Transistor (TFT) Pixel Design for AMOLED

  • Han, Min-Koo;Lee, Jae-Hoon;Nam, Woo-Jin
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.413-418
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    • 2006
  • Highly stable thin-film transistor (TFT) pixel employing both low temperature polycrystalline silicon (LTPS) and amorphous silicon (a-Si) for active matrix organic light emitting diode (AMOLED) is discussed. ELA (excimer laser annealing) LTPS-TFT pixel should compensate $I_{OLED}$ variation caused by the non-uniformity of LTPS-TFT due to the fluctuation of excimer laser energy and amorphous silicon TFT pixel is desired to suppress the decrease of $I_{OLED}$ induced by the degradation of a-Si TFT. We discuss various compensation schemes of both LTPS and a-Si TFT employing the voltage and the current programming.

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Changes of Functional Components Present in Lipid Foods during Cooking (유지식품의 조리 중 기능성분의 변화)

  • Choe, Eun-Ok
    • Korean journal of food and cookery science
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    • v.21 no.5
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    • pp.742-758
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    • 2005
  • Lipid-based functional components present in foods undergo chemical changes during cooking. Useful n-3 and n-6 fatty acids, phytosterols, tocopherols, and carotenoids are degraded by thermal cooking such as frying, resulting in loss of their physiological functions. However, conjugated linoleic acid and diacylglycerols can be formed during heating, which would be beneficial to the health. Degree of degradation and formation of the functional components depends on the cooking method, cooking temperature and time, lipid matrix containing the components, and the presence of other materials. Although it is clear that the content of each functional component varies during long-heating in a model system consisting of small numbers of components, the real foods cooked in a small scale for a limited cooking time do not show highly significant differences in the functional components contents from raw food materials.

Reliability analysis of repairable k-out-n system from time response under several times stochastic shocks

  • Fang, Yongfeng;Tao, Wenliang;Tee, Kong Fah
    • Smart Structures and Systems
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    • v.14 no.4
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    • pp.559-567
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    • 2014
  • The model of unit dynamic reliability of repairable k/n (G) system with unit strength degradation under repeated random shocks has been developed according to the stress-strength interference theory. The unit failure number is obtained based on the unit failure probability which can be computed from the unit dynamic reliability. Then, the transfer probability function of the repairable k/n (G) system is given by its Markov property. Once the transfer probability function has been obtained, the probability density matrix and the steady-state probabilities of the system can be retrieved. Finally, the dynamic reliability of the repairable k/n (G) system is obtained by solving the differential equations. It is illustrated that the proposed method is practicable, feasible and gives reasonable prediction which conforms to the engineering practice.

Development of Specific organ targeting drug delivery system II : Physico-pharaceutical study on the crose-linked albumin microspheres containing cytarabine

  • Kim, Chong-Kook;Lee, Jin-Kyu;Lah, Woon-Lyong
    • Archives of Pharmacal Research
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    • v.9 no.1
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    • pp.39-43
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    • 1986
  • Bovine serum albumin microspheres containing cytarabine were prepared using cross-linking agent, formaldehyde. The shape and the size distribution of them were observed. The shape of them was spherical and the susrface was compact and smooth. The size distribution of them was affected by dispersion forces during emulsfication. The release of cytarabine from albumin microspheres was dependent upon cross-linking time, amount of cross-linking agent and drug/albumin ratio. However, the difference of drug release by the dispersion forces was not great. After release test, the shape of albumin microspheres was nonspherical and the albumin matrix seemed to be a little relaxed. The degradation tests of albumin microspheres by the proteolytic enzyme showed that albumin microspheres were progressively digested according to the cross-linking degree.

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The Degrading Patterns of Protein Bodies in the Ginseng Endosperm Cells (인삼배유세포에 존재하는 단백질체의 분해양상)

  • Lee, Chang-Seob;Kim, Woo-Kap
    • Applied Microscopy
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    • v.24 no.4
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    • pp.86-97
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    • 1994
  • Protein bodies in the endosperm cells of mature red ginseng (Panax ginseng C.A. Meyer) were distributed evenly in the cytoplasm and their size varied from 1 to $8{\mu}m$. Three types of protein bodies were detected and they are spherical or egg-shaped ones containing homogeneous matrix only, spherical ones containing globoids, and irregular shaped ones. Protein bodies degraded in two patterns, one is to start the degration of the body from the surface toward the center, while the other is that the body was broken evenly and then degraded gradually. After degradation, only the limiting membrane remained, that causes the body to be empty. The limiting membranes fused with each other to form a large vacuole. Vicilin and legumin decreased in the endosperm cells as the protein bodies degraded gradually whereas they increased in the umbiliform layers.

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A Health Index of Aged Undeground MV Cables in Domestic (경년열화된 지중 MV급 케이블의 Aging Index)

  • KIM, Yong-Hyun;KIM, Su-Hwan;LEE, Seung-Won;LIM, Jang-Seob
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.1216-1216
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    • 2015
  • In this study, the author apply the VLF(Very Low Frequency) tan-delta data that has been measured at each office of the KEPCO 2012 to the Weibull distribution which is the statistical analysis as previous studies for the remaining life prediction through the improvement of the sensitivity and reliability of the degradation state assessment of underground distribution power cables. Also, in this paper, UCD(Used Cable Diagnosis) Matrix proposed by KEPCO was applied to the hierarchy of assessment prioritization. it suggests Aging Index for condition assessment and high reliability of proper economic replacement cycle using the weight according to the assessment prioritization.

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Reduced Complexity Signal Detection for OFDM Systems with Transmit Diversity

  • Kim, Jae-Kwon;Heath Jr. Robert W.;Powers Edward J.
    • Journal of Communications and Networks
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    • v.9 no.1
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    • pp.75-83
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    • 2007
  • Orthogonal frequency division multiplexing (OFDM) systems with multiple transmit antennas can exploit space-time block coding on each subchannel for reliable data transmission. Spacetime coded OFDM systems, however, are very sensitive to time variant channels because the channels need to be static over multiple OFDM symbol periods. In this paper, we propose to mitigate the channel variations in the frequency domain using a linear filter in the frequency domain that exploits the sparse structure of the system matrix in the frequency domain. Our approach has reduced complexity compared with alternative approaches based on time domain block-linear filters. Simulation results demonstrate that our proposed frequency domain block-linear filter reduces computational complexity by more than a factor of ten at the cost of small performance degradation, compared with a time domain block-linear filter.

Control of Pierce's Disease through Degradation of Xanthan Gum

  • Lee, Seung-Don;Donald A. Cooksey
    • The Plant Pathology Journal
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    • v.20 no.1
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    • pp.1-6
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    • 2004
  • The diseases caused by Xylella fastidiosa are associated with aggregation of the bacteria m xylem vessels, formation of a gummy matrix and subsequent blockage of water uptake. In the closely related pathogen, Xanthomonas campestris, xanthan gum is known to be an important virulence factor, probably contributing to bacterial adhesion, aggregation and plugging of xylem. Xanthan gum, produced by X. campestris, is an extra-cellular polysaccharide consisting of a cellulose backbone ($\bate$-1,4-linked D-glucose) with trisaccharide side chains composed of mannose, glucuronic acid and mannose attached to alternate glucose residues in the backbone. We had constructed a mutant of X. campestris lacking gumI gene that is responsible for adding the terminal mannose for producing modified xanthan gum which is similar to xanthan gum fromX. fastidiosa. The modified xanthan gum degrading endgphytic bacterium Acineto-bacter johnsonii GX123 isolated from the oleander infected with leaf scorch disease.

Efficient Detection of Space-Time Block Codes Based on Parallel Detection

  • Kim, Jeong-Chang;Cheun, Kyung-Whoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.2A
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    • pp.100-107
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    • 2011
  • Algorithms based on the QR decomposition of the equivalent space-time channel matrix have been proved useful in the detection of V-BLAST systems. Especially, the parallel detection (PD) algorithm offers ML approaching performance up to 4 transmit antennas with reasonable complexity. We show that when directly applied to STBCs, the PD algorithm may suffer a rather significant SNR degradation over ML detection, especially at high SNRs. However, simply extending the PD algorithm to allow p ${\geq}$ 2 candidate layers, i.e. p-PD, regains almost all the loss but only at a significant increase in complexity. Here, we propose a simplification to the p-PD algorithm specific to STBCs without a corresponding sacrifice in performance. The proposed algorithm results in significant complexity reductions for moderate to high order modulations.

Mechanical Properties of Thermoplastic Composite Reinforced Porous Carbon

  • Hwang, Taek-Sung;Park, Jin-Won;Song, Hae-Young;Hwang, Eui-Hwan
    • Carbon letters
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    • v.1 no.2
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    • pp.87-90
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    • 2000
  • Porous carbon from charcoal filled polypropylene composites were prepared and their mechanical properties were evaluated. In preparing the composites, crosslinking agent (sodium benzonate) were used in order to improve the bonding force between matrix and fillers. In this study, the effects of charcoal powder and sodium benzonate concentration on the mechanical properties and interface phenomena on the composites were evaluated. The mechanical properties of composites increased progressively with the decrease of filler loading. In the case of addition of the crosslinking agent into the composite, the mechanical properties were increased and showed maximum value at the 3 wt% concentration of sodium benzonate. According to the result of the TGA, the weight loss of composite according to crosslinking agent was not observed and initial thermal degradation temperature of composite reinforced charcoal was located at $390^{\circ}C$.

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