• 반도체디스플레이기술학회지
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• 제15권2호
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• pp.55-60
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• 2016

This study was developed through the secondary battery module charging/discharger possible utilization in the production process equipment circuit. The developed module is ensuring construction of efficient and productive charging and discharger through this research a limit on the yield and the price of existing single -channel charge and discharger circuit as a 5V 70A grade secondary battery Formation charge and discharger for up to 1 board 4 channels. In order to improve the sensing accuracy, through a robust differential amplifier circuit described using 16bit Analog-Digital Converter and noise was secured 16bit resolution sensing. The configuration also made demands for property Rise / Fall Time. Data Acquisition, discharge efficiency and also to fit the sink circuit temperature level for mass production.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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• pp.391-392
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• 2013

반도체 집적회로의 고집적화 및 고성능화를 위한 기본 소자(MOSFET)의 미세화 및 단위공정의 물리적 한계를 극복하기 위해 기존의 Top-down 방식에서 buttom-up 방식의 공정에 대한 연구가 진행되고 있다. 그 중 nanoparticles를 이용한 나노소자 제작 연구가 이루어지고 있다. 하지만 이러한 nanoparticles를 이용한 나노소자의 제작에 있어서 원하는 위치에 nanoparticles를 배열하고 정렬하는데 어려움을 겪고 있다. 이 문제를 해결하기 위해서 자기조립 특성을 가지고 있는 DNA분자와 기능화를 통하여 표면에 positive charge를 띄고있는 Gold nanoparticles를 상호결합 시키는 실험을 하였다. Au-DNA nanowire는 backbone에 있는 phosphate부분에서 negative charge를 띠고 있는 DNA와 positive charge를 띠고 있는 Gold nanoparticles가 결합하는 원리로 형성된다. 그렇지만 Gold particles를 표면이 아닌 DNA에만 붙이는 것은 아직 해결해야 할 부분으로 남아있다. 본 연구에서는 이 문제를 해결하기 위하여 pH 조절을 통하여 기능화된 Gold particles의 charge의 변화를 주고 이를 Zeta potential 측정기로 측정한 후에 이 particles와 DNA를 결합시켜서 FE-SEM과 AFM 으로 확인하는 실험을 하였다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제52권7호
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• pp.310-313
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• 2003

The purpose of this paper is to evaluate the effects of pre-formed space charges by DC stress on partial discharge(PD) characteristics in XLPE. We have suggested a modified pulsed electro-acoustic(PEA) method and successfully measured both space charge distribution and current simultaneously. It has been demonstrated that the PD patterns are strongly influenced by the pre-formed space charge distributions, which are hardly disappeared up to AC 8㎸ in electrode configuration including air gap between XLPE layer and electrode. From the results, it could be said that the pre-formed space charges by DC stress can play harmful and dangerous roles in insulating system under AC operating voltages because of the field distortion and localization due to the pre-formed space charge.

• 전기학회논문지
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• 제60권2호
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• pp.320-324
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• 2011

A digital technique is adopted to calibrate the current mismatch of the charge pump (CP) in phase-locked loops. A 2 GHz charge pump PLL (CPPLL) is used to justify the proposed calibration technique. The proposed digital calibration technique is implemented simply using a counter. The proposed calibration technique reduces the calibration time by up to a maximum of 50% compared other with techniques. Also by using a dual-mode CP, good current matching characteristics can be achieved to compensate $0.5{\mu}A$ current mismatch in CP. It was designed in a standard $0.13{\mu}m$ CMOS technology. The maximum calibration time is $33.6{\mu}s$ and the average power is 18.38mW with 1.5V power supply and effective area is $0.1804mm^2$.

• Journal of Electrical Engineering and Technology
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• 제7권6호
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• pp.824-833
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• 2012

In this paper, a coordinated state-of-charge (SOC) control strategy for the energy storage system (ESS) operating under microgrid islanded mode to stabilize the frequency and voltage was proposed. The proposed SOC control loop is made up of PI controller, which uses a SOC state of the energy storage system as an input and an auxiliary reference value of secondary control as an output. The SOC controller changes the auxiliary reference value of secondary control to charge or discharge the ESS. To verify the proposed control strategy, PSCAD/EMTDC simulation study was performed. The simulation results show that the SOC of the ESS can be regulated at the desired operating range without degrading the stabilizing control performance by proposed coordinated SOC control method.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.374-374
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• 2010

Charge transfer mechanism of poly(4,4'-aminotriphenylene hexafluoroisopropylidenediphthalimide) (TP6F PI) which exhibits bistable ON and OFF switching has been studied using photoemission electron spectroscopy (PES) and near-edge x-ray absorption fine structure (NEXAFS). Here, we demonstrate novel set-up in which holes are injected by photoemission process instead of direct charge carrier injection via metal electrode. The accumulated charges on the PI surface in the OFF state abruptly flow across the PI film when the bias voltage of a back electrode reaches a specific value, indicating that the film is changed to the ON state. Core level and x-ray absorption spectra probed at charge injection region via photoemission process do not show any evidences implying structural modification of TP6F PI during the phase change. Whereas, in valence band spectra, the highest occupied molecular orbital (HOMO) is shifted toward Fermi level, responsible for improved hole-mobility of TP6F PI of ON state.

• 한국의류학회지
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• 제30권5호
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• pp.753-761
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• 2006

This paper suggests the optimal conditions for the laundry to prevent from the electrostatic charge by the evaluation of the electrostatic characteristics in the full process of washing and drying. Cotton, nylon, and polyester fabrics were used as test washing specimens. Detergent and softener were used under the standard washing cycle, and then the electrostatic characteristics of laundry were measured. The results showed that the moisture regain decreased and the electrostatic charge increased with the drying time. It was observed that the specimen fabrics were already dried up before the standard drying cycle was finished. Consequently, the excessive drying caused a generation of electrostatic charge due to the removal of the trace of moisture remaining and the excessive friction. Especially, the softener played an important role to prevent from a generation of electrostatic charge, whose insertion was more effective in the drying than in the rinsing process. It was also shown that the electrostatic charge could be decreased by drying the fabrics of one kind. On the other hand, for drying the mixed kinds of fabrics, the electrostatic charge increased remarkably. Therefore we suggest that the laundry be classified according to the kinds of fiber, and then be washed and dried before excessive drying to reduce electrostatic charge And further, a proper use of softener is effective to reduce electrostatic charge.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 C
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• pp.1078-1080
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• 1995

The pulsed electro-acoustic method was used as a nondestructive measurement technique of spare charge distribution in dielectric materials. In our work presented here, we measured simultaneously the space charge distribution and conduction current in the low-density polyethylene samples with elevated temperatures up to $80^{\circ}C$ and electric field up to 20kV/mm. In the temperature less than $50^{\circ}C$, homocharges are mainly accumulated close to the electrodes under DC bias and after grounding. At the temperature exeeds $50^{\circ}C$, heterocharges are accumulated near the opposite electrode under DC bias. However after grounding the upper electrode, this charges immediately disappeared. The conduction current in LDPE at $20^{\circ}C$ and $30^{\circ}C$ was reduced slowly with increasing interval of applied voltage. But as temperature increased, the conduction current tended to increase slowly with the time and the degree of increase is enlarged.

• Journal of Information Display
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• 제2권1호
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• pp.24-33
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• 2001

The characteristics of the reset and the address discharges of an alternating current Plasma Display Panel (ac PDP) were studied using 2-dimensional numerical discharge cell simulation. We investigated the wall charge variations during the reset discharge adopting ramping reset pulse and the subsequent addressing discharge. The roles of the ramping reset scheme can be divided into two stages, each electrode gathers wall charges during ramping-up of the initial stage and the built-up wall charges are lost during ramping-down of the later stage. Address discharge does not only change the wall charge distributions on the address and the scan electrodes but also on the sustain electrode. The increase in the wall charges on the sustain electrode was observed with the variation of the applied voltage to the sustain electrode during the address period. The increase of the applied voltage to the sustain electrode during the address period is expected to induce the decrease of the sustain voltage during the display period.

• 지역연구
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• 제37권1호
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• pp.45-61
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• 2021

본 연구의 목적은 한강수계 물이용부담금을 둘러싼 이해당사자들의 갈등해결을 위한 최적방안을 제시하는 방법론적 틀을 설계하고, 분석결과를 통해 한강수계 물이용부담금 갈등해결을 위한 정책 방향을 제시하는 것에 목적을 두고 있다. 이를 위해 한강수계 물이용부담금을 두고 서로 다른 입장을 취하고 있는 의사결정자들 간의 다면적인 갈등의 메커니즘을 이해하는 과정이 선행되었으며 갈등해결을 위한 그래프모형을 적용하여 한강수계 물 이용부담금 갈등 해결을 위한 최적방안을 도출하였다. 분석결과에 따르면 한강수계 물이용부담금 갈등의 해결점을 찾을 수 있는 최적의 상태는 서울·인천 지역이 지속적으로 물이용부담금 인하를 요구하는 것과 동시에, 서울·인천·경기 지역이 기존 부과요율에 따른 부과금을 납부하는 것이다. 그리고 한강수계관리위원회는 갈등 해결을 위해 물이용부담금 부과요율 결정에 대한 의사결정구조 합리화, 서울·인천 지역에 대한 한강수계관리기금 지원근거 마련, 수혜 지역 및 주민의 특성을 고려한 한강수계관리기금의 투명한 운용 등을 포함하는 서울·인천 및 경기지역이 원하는 정책을 수립할 때 갈등의 해결점을 찾아갈 수 있었다. 본 연구는 한강수계 물이용부담금 갈등해결 관련 환경정책 방향을 수립하는데 객관적인 의사결정 정보 제공을 할 수 있고, 환경의 공동 사용에 따른 갈등과 관련된 유사한 후속연구에 방법론적인 기반을 제공할 것으로 기대된다.