• 조명전기설비학회논문지
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• 제14권1호
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• pp.67-74
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• 2000

본 논문에서는 GIS내 파티클에 의해 발생할 수 있는 절연사고를 미연에 방지하고 또한 파티클의 상태를 파 악하기 위하여 GIS 41 파티클 상태에 따른 부분방전 신호를 측정하고 분석하였다. 본 논문에서는 GIS내 파티콜 의 상태를 4가지(전극부착시, 외함부착시, 스페이서 부착시, 자유운동시)로 모의하였으며, 이때 발생하는 부분방전 신호의 $\Phi$-Q-N 분포를 형태적으로 분석하였다 또한, $\Phi$-Q 분포에 대하여 통계적 연산자를 도입하여 파티 클 상태에 따른 부분방전 신호를 정량적으로 분석하였다. 그 결과 파티클 상태에 따른 $\Phi$-Q-N 분포의 형태적인 분석과 $\Phi$-Q 분포의 정량적인 분석으로 파티콜의 상태 구별이 가능하였다.

• 한국전기전자재료학회논문지
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• 제22권2호
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• pp.169-173
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• 2009

We studied driving characteristics according to the ratio of mass and charging (m/q) value for charged toner particles with black and yellow color in charged particle type display panel. After biasing rectangle pulse to the transparency electrodes of putted panel with toner particles, its response time and contrast ratio are simultaneously measured using a laser as a optical source, photodiode as a detector and reflective system. As a results, contrast ratio is largest at the shortest response time region which is different to the particle because of m/q. We proposed relational equation for response time, m/q, cell gap and biasing voltage. It has not been studied and reported to analyze the relationship of response time, biasing voltage, lumping phenomena, cell gap, and contrast ratio for toner particle type display.

• 한국전기전자재료학회논문지
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• 제24권11호
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• pp.915-919
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• 2011

We analyzed various forces affective to the charged particles in closed space, to explain the image degradation and lifetime-shortening phenomena because of particle lumping which is one of the serious problems in reflective displays. It is possible to predict the quantity of q/m which is the most important parameter in determining the optical and electrical characteristics, by calculating the image force and kinetic energy. For stable driving, the quantity of q/m must be in the defined range but it changes during the fabrication process, so we added the filtering process to solve this problem and obtained the well-defined nonlinear driving voltage coinciding with the threshold voltage. And we obtained the fully-driving property which prevents the particle lumping and decides the image quality and lifetime of panel from the optical characteristics and occupation surface of moving particles.

• 한국전기전자재료학회논문지
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• 제25권2호
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• pp.129-134
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• 2012

We analyzed the movement and response time of charged particles according to particle-inserting methods to understand the variation of quantity of q/m of charged particles, which is a very important factor in electrical and optical characteristics of the charged particle type display, such as lifetime, response time, contrast ratio, reflectivity, etc. For our study we used white and black charged particles of which diameter is $20{\mu}m$, prepared pieces of ITO(indium tin oxide) coated glass substrate, and formed ribs on the glass substrates. The width of a rib is $30{\mu}m$ and the cell size is $220{\mu}m{\times}220{\mu}m$. As the particle-inserting methods, the white and black charged particles were respectively inserted into a front and a rear panel with a very small electric field and also the mixture of the white and black charged particles were inserted into a rear panel. As a result of the driving characteristics of charged particles, the factors about variation of quantity of q/m according to the particle inserting method was experimentally demonstrate, showing very different driving voltage, response time, the particle movement, etc.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2002년도 추계학술발표논문집
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• pp.178-180
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• 2002

In this Paper, we conducted a experimental study to measure a particle size distribution and mass spectrum with the special instrument such as ISPM and Q-MS. Also, we set up a total measuring system for monitoring the particle in the process chamber.

• 한국전기전자재료학회논문지
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• 제24권8호
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• pp.669-673
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• 2011

The charged particle type display is a kind of the reflectivity type display and shows an image by absorption and reflection of external light source, which has keep an image without additional electric power because of bistability. In this paper, we made a device whose cell gap is $56\;{\mu}m$ and also analyzed driving and memory characteristics by applied driving voltages. As a result, we found that the driving voltage and memory effect depend on q/m(charge to mass ratio) of charged particle. In this case of breakdown voltage, the devices showed degradation of reflectivity and memory effect due to irregular movement of overcharged particles. In addition, contrast ratio of the device varies with memory effect. Thus, we consider that device needs uniform q/m for improvement of electric and optical properties and memory effect.

• 한국가시화정보학회지
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• 제20권3호
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• pp.74-85
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• 2022

We propose a Cubic-Interpolated Pseudo-Particle Lattice Boltzmann method (CIP-LBM) for the convection-diffusion equation (CDE) based on the Bhatnagar-Gross-Krook (BGK) scheme equation. The CIP-LBM relies on an accurate numerical lattice equilibrium particle distribution function on the advection term and the use of a splitting technique to solve the Lattice Boltzmann equation. Different schemes of lattice spaces such as D1Q3, D2Q5, and D2Q9 have been used for simulating a variety of problems described by the CDE. All simulations were carried out using the BGK model, although another LB scheme based on a collision term like two-relation time or multi-relaxation time can be easily applied. To show quantitative agreement, the results of the proposed model are compared with an analytical solution.

• Transactions on Electrical and Electronic Materials
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• 제17권4호
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• pp.212-216
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• 2016

A reflective electronic display that uses negatively and positively charged particles has excellent bistability, a welldefined threshold voltage, and an extremely fast response time in comparison with other reflective displays. This type of display shows images through the movement of charged particles whose motion depends on the value of q/m (charge per mass for a particle). However, the ratio q/m can easily be changed by the forces acting on the charged particles in a cell of the panel and by friction that occurs after mixing oppositely charged particles and in the particle-insertion process. In this study, we propose a method to determine the appropriate range of q/m by using the reflectivity and response time of charged particles to modify q/m. In this manner, the electrical and optical properties of reflective displays are improved.

• 대한환경공학회지
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• 제31권4호
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• pp.256-262
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• 2009

도시지역 비점오염부하를 저감하는 장치 중에서 수리동력학적 분리장치(HDS)는 가장 많이 이용되고 있다. 본 연구에서는 HDS장치 유형 중에서 Vortex Screen 장치를 실험실 규모로 개발 및 제작하여 강우유출수 처리특성을 분석하였다. 강우유출수내 입자물질을 모의하기 위하여 실험에 사용한 시료는 합류식 하수관거의 맨홀 바닥 퇴적물질, 도로변 측구의 퇴적물질, 소각장 fly ash, polyvinyl chloride (PVC)분말 등의 시료를 대상으로 하였다. 유입유량의 변화를 주었을 때 처리장치 본체에서 약 2분이 경과한 후 안정된 상태에서 유입수와 유출수 시료를 동시에 채수하였다. 수면적부하율은 110∼1,550 $m^3/m^2$ day의 범위로 운전하였으며, 유입수 SS농도의 범위는 141~1,986 mg/L로 하였다. Vortex Screen을 이용하여 다양한 입경과 밀도들 가진 입자들을 대상으로 수면적부하율과 하부배출유량비를 운전조건으로 하여 처리특성을 분석한 결과 제거효율에 영향을 주는 인자 중, 월류유량에 대한 하부배출유량 비율($Q_U/Q_O$), $Q_U/Q_O$값이 10%에서 20% 증가 시 SS 제거효율은 6% 증가하는 특성을 나타내었다. 도시지역의 대표적인 입경을 가진 퇴적물질 125<$d_p$<300 ${\mu}m$를 대상으로 처리능을 분석한 결과 SS, COD 제거효율 범위는 각각 68.0~ 81.0%, 53.1~71.9%를 나타내었다. 수면적 부하율이 증가함에 따라 처리효율은 유입부 유도판을 설치한 경우가 설치하지 않은 경우보다 10~20% 향상되는 것으로 분석되었다.

• 조명전기설비학회논문지
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• 제17권1호
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• pp.31-36
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• 2003

본 논문은 GIS내 파티클에 의해 발생한 부분방전 신호에 대한 정량적 분석 및 상태에 따른 패턴인식에 관하여 설명하였다. GIS내 파티클의 상태를 4가지로 모의하여 각각의 경우에 부분방전 신호를 계측한 후 Ф-Q-N분포로 나타내었고, 다시 Ф-Q분포, Ф-Qm분포, Ф-N분포, Ф-N분포로 나타내었다. 각각의 분포는 통계적 연산자에 의해 정량화 하여 분석하였고, 또한 연산자들을 패턴인식을 위한 입력데이터로 이용하여 수행하였다. 그 결과 파티클의 상태에 따른 분포 형태는 파티클의 상태에 따라 서로 다른 특성을 나타냈었으며, 또한 뉴럴 네트웍을 이용한 패턴 인식의 결과는 약92〔%〕였으며 연산자들의 입력 데이터가 많을수록 더 정확한 결과가 나타났다.