• Title/Summary/Keyword: particle-in-cell

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The Effects of Alpha Particles on the Sense Amplifier in Memory Devices (알파 입자가 기억소자의 SENSE AMP에 미치는 영향)

  • 이성규;한민구
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.40 no.7
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    • pp.675-683
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    • 1991
  • When alpha particles are incident into the substrate, we have calculated the advanced current caused by collecting charges as a function of time, the energy of alpha particle, and the carrier concentration of the substrate. Employing SPICE, we have compared two circuits of which one has dummy cell and another has dummy line instead of dummy cell, and both are connected to the bit line node including sense amplifier and cell within the memory device. From the numerical analysis, (it may be conjectured that)the smaller energy of alpha particle and the lower concentration of the substrate, the more possibility of misoperation due to alpha particles. It may be also found that the effects of alpha particle are substantially reduced in the circuit without dummy cell.

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Pattern Design and Driving of a Charged Particle Type Display (대전입자형 디스플레이의 패턴 설계 및 구동)

  • Kwon, Ki-Young;Kim, Sung-Woon;Hwang, In-Sung;Kim, Chul-Ju;Kim, Young-Cho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.53-54
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    • 2007
  • Charged particle type display using particles which have opposite charge and color is based on effect of reversible optical property due to electric field. we designed mask pattern for fabrication of the charged particle type display based on glass substrate and investigated cell gap dependent of driving voltage and selectively driving method. the panel driven by our selectively driving method, we could obtain image which had vary little crosstalk caused by electrical interference and conform the last image maintained by memory effect without additional voltage.

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Electro-Optical characteristics with dielectric thickness of AC-PDP

  • Jung, K.B.;Choi, J.H.;Kim, S.B.;Jung, Y.;Choi, E.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.768-770
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    • 2003
  • In AC PDP, since charges generated by gas discharge are accumulated on the dielectric. The dielectric is a major factor to determine cell capacitance and its memory effect is a play an important role in PDP driving. In this experiment, we have investigated the electro-optical characteristics with dielectric thickness and we have analyzed wall charge and wall voltage by Q-V energy diagram. The dielectric thickness was varied from 20 um to 50 um. As results, according to the dielectric thickness increase,cell capacitance and power consumption is reduced.

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Effects of Aging Process in Kinetic Movement of Charged Paticles (에이징 공정이 대전입자 운동에 미치는 영향)

  • Kim, In-Ho;Kim, Young-Cho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.6
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    • pp.1175-1179
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    • 2009
  • We analyze voltage characteristics of charged particle type display according to particle layers and cell gap between two electrodes and ascertain the aging effects by measuring the response time of particles with and without aging process. The threshold/driving/breakdown voltage is proportional to layers of charged particles and cell gap and the response time at driving voltage is faster than that of threshold and breakdown voltage because of different q/m of color and black particles. The analysis of response time is a method of estimation of optical characteristics, driving voltage and particle lumping and these results are promoted by aging process. We use the laser and photodiode to measure response time and optical properties. It has not been studied and reported to analyze the relationship of response time, threshold/driving/breakdown voltage, lumping phenomena, cell gap, and aging process for charged particle type display.

Transport of space charge between sub-pixels in AC-plasma cell discharge

  • Lee, S.B.;Park, E.Y.;Han, Y.G.;Moon, M.W.;Oh, P.Y.;Song, K.B.;Lee, H.J.;Son, C.G.;Jeong, S.H.;Yoo, N.L.;Hong, Y.J.;Jeong, S.J.;Kim, J.H.;Park, S.O.;Choi, E.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.929-931
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    • 2006
  • In this experiment, we have investigated that the transported space charge between sub-pixels in AC-plasma cell discharge. The test pulse 30 V, 5μs was applied to the address electrodes of neighbor cells of discharge occurred cells. And we have measured the transported space charge between sub-pixels in accordance with the various last sustain pulse widths t(time gap between the rising edges of sustain and test pulses) of 0.2 to 3μs. It was observed that the peak value of transported space charge has been shown to be 21.5pC at 1.0μs. And the IR peak value have been occured after 0.51μs with respect to sustain voltage.

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An Analysis of Particle-clumping Phenomena of a Charged Particle-type Reflective Electronic Display

  • Kim, Young-Cho
    • Transactions on Electrical and Electronic Materials
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    • v.13 no.4
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    • pp.212-214
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    • 2012
  • Both the electrically positive and negative particles in a cell of quick response-liquid powder display (QR-LPD) are surrounded by conductive electrodes on the upper and lower substrate and the dielectric materials of the barrier ribs. Particles in a cell are attached to or detached from the other materials by image force, electric field, Coulomb's force, and Van der Waals' force. Through these forces, the moving particles form an image but induce clumping phenomena. Particles having a large kinetic energy by a large q/m value crash into the opposite electrode with high speed at a large driving voltage and quickly lose electrically charged material. As a result, these particles are clumped and degrade panel performance. The clumped particles in a cell are observed by microscopic photographs and ascertained by a response time. When the bias voltage is increased to 0.68-0.76 V/μm, particle clumping occurs abruptly and the response time increases sharply. This particle clumping is similarly observed after the number of driving times at the driving voltage (0.42-0.64 V/μm).

The Driving Method of a Charged Particle Type Display (대전입자헝 디스플레이의 구동방식)

  • Kwon, Ki-Young;Kim, Sung-Woon;Hwang, In-Sung;Kim, Young-Cho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.1
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    • pp.35-40
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    • 2008
  • In this paper, fundamental driving method and selective driving each cells of charged particle type display are described. To fabricate panel, mask patterns with cell area of 500μm×500μm are designed. Gain of driving voltage due to increase of cell gap is observed on the basis of fundamental driving method. To selectively drive each cells of charged particle type display that is driven by passive matrix method, selective driving of charged particle type display is achieved after establishing interrelation of voltage of select cell and unselect. And than crosstalk of the driven panel is observed. It can be found that the last image is maintained without additional voltage by memory effect.

Particle-in-Cell Simulation for the Control of Electron Energy Probability & Electron temperature of Dielectric Barrier Discharges at Atmospheric Pressure

  • Lee, Jung-Yel;Song, In-Cheol;Lee, Ho-Jun;Lee, Hae-June
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.02a
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    • pp.528-528
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    • 2012
  • Recently, atmospheric pressure plasmas attract lots of interests for the useful applications such as surface modification and bio-medical treatment. In this study, a particle-in-cell Monte Carlo collision (PIC-MCC) simulation was adopted to investigate the discharge characteristics of a planar micro dielectric barrier discharge (DBD) with a driving frequency from 13.56 MHz to 162.72 MHz and with a gap distance of 80 micrometers. The variation of frequency, in the change in the electron energy probability function (EEPF). Through the relation between the ion trajectories and the frequency, results in the change of EEPFs is achievable with the turning point of frequency mode. Therefore, it is possible to categorize the efficient operation range of DBDs for its applications by controlling the interactions between plasmas and neutral gas for the generation of preferable radicals.

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Electric field distribution and discharge characteristics in accordance with various ITO electrode structures in AC-PDP

  • Cho, Seok-H.;Oh, P.Y.;Kim, J.H.;Hong, Y.J.;Kwon, G.C.;Cho, G.S.;Choi, E.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.396-399
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    • 2008
  • In this study, the electric field distributions have been investigated by simulation in accordance with the various shapes of ITO-electrodes. Also we have measured the density of excited Xe atoms in the 1s5 state in discharge cell, where the gap distance of 60 um, gas pressure of 400 Torr, Xe contents of 7%, and sustaining voltage of 200 V are kept in this experiment. The maximum density of excited Xe atoms in the 1s5 state in a discharge cell for the fish-boned, T shaped and squared ITO electrodes have been measured to be 3.01×1013cm3, 2.66×1013cm3 and 2.06×1013cm3, respectively. It is shown that the electric field distribution with different ITO Electrodes is essential factor for these maximum density of excited Xe atoms in discharge cell.

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Characteristics of Ultra High Frequency Partial Discharge Signals from Metallic Particle Defected Oil-paper Insulation in Transformer (변압기 절연지 표면 금속 이물질 방전에 의한 극초단파 신호특성)

  • Yoon, Jin-Yul;Ju, Hyung-Jun;Goo, Sun-Geun;Park, Ki-Jun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.22 no.10
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    • pp.879-883
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    • 2009
  • This paper was provided to help in detecting defects in power transformer. For this purpose, a partial discharge cell was designed and manufactured as a discharge source to simulate particle defected paper-oil insulation in power transformer. Experimental set-up for measuring PD signals was described. Magnitude of electromagnetic wave signals and corresponding amount of apparent discharge were measured simultaneously against phase of applied voltage to the discharge cell. Frequency range and pattern of PRPD(Phase Resolved Partial Discharge) of partial discharge signals were examined and analyzed. The results will be contributed to build the defect database of power transformer and to decrease the substation faults.