• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1997년도 추계학술대회 논문집
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• pp.237-241
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• 1997

It is necessary to know the accurate field distribution around the high power apparatus, in designing it. To calculate the field around electrodes, we use the Charge Simulation Method(CSM) among several numerical methods and develop the new \"Field Analysis System\", by which we can draw the shape of electrodes, save the drawing in ascii code and apply CSM on the data. In the Field Analysis System, we try several rules for arrangement of simulation charge on CSM and consider their accuracy. At firs we simulate the case with simple electrode geometry and consider the adequacy of the rules. With tole field Analysis System applied the rules, we simulate the main electrode of load switchgear. As a result of the simulation, equipotential line, flux line and field strength on male electrode are drawn.

• 대한전자공학회논문지SD
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• 제45권7호
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• pp.37-43
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• 2008

본 논문에서는 전하 펌프 방법 (Charge Pumping Method, CPM)를 이용하여 서로 다른 질화막 층을 가지는 N-Channel SANOS (Silicon-$Al_2O_3$-Nitride-Oxide-Silicon) Flash Memory Cell 트랜지스터의 트랩 특성을 규명하였다. SANOS Flash Memory에서 계면 및 질화막 트랩의 중요성은 널리 알려져 있지만 소자에 직접 적용 가능하면서 정화하고 용이한 트랩 분석 방법은 미흡하다고 할 수 있다. 기존에 알려진 분석 방법 중 전하 펌프 방법은 측정 및 분석이 간단하면서 트랜지스터에 직접 적용이 가능하여 MOSFET에 널리 사용되어왔으며 최근에는 MONOS/SONOS 구조에도 적용되고 있지만 아직까지는 Silicon 기판과 tunneling oxide와의 계면에 존재하는 트랩 및 tunneling oxide가 얇은 구조에서의 질화막 벌크 트랩 추출 결과만이 보고되어 있다. 이에 본 연구에서는 Trapping Layer (질화막)가 다른 SONOS 트랜지스터에 전하 펌프 방법을 적용하여 Si 기판/Tunneling Oxide 계면 트랩 및 질화막 트랩을 분리하여 평가하였으며 추출된 결과의 정확성 및 유용성을 확인하고자 트랜지스터의 전기적 특성 및 메모리 특성과의 상관 관계를 분석하고 Simulation을 통해 확인하였다. 분석 결과 계면 트랩의 경우 트랩 밀도가 높고 trap의 capture cross section이 큰 소자의 경우 전자이동도, subthreshold slop, leakage current 등의 트랜지스터의 일반적인 특성 열화가 나타났다. 계면 트랩은 특히 Memory 특성 중 Program/Erase (P/E) speed에 영향을 미치는 것으로 나타났는데 이는 계면결함이 많은 소자의 경우 같은 P/E 조건에서 더 많은 전하가 계면결함에 포획됨으로써 trapping layer로의 carrier 이동이 억제되기 때문으로 판단되며 simulation을 통해서도 동일한 결과를 확인하였다. 하지만 data retention의 경우 계면 트랩보다 charge trapping layer인 질화막 트랩 특성에 의해 더 크게 영향을 받는 것으로 나타났다. 이는 P/E cycling 횟수에 따른 data retention 특성 열화 측정 결과에서도 일관되게 확인할 수 있었다.

• Journal of Electrical Engineering and Technology
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• 제9권3호
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• pp.843-847
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• 2014

In Super Junction (SJ) MOSFETs, charge balance is the most important issue of the SJ fabrication process. In order to achieve the best electrical characteristics, such as breakdown voltage and on-resistance, the N-type and P-type drift regions must be fully depleted when the drain bias approaches the breakdown voltage, which is known as the charge balance condition. In conventional charge balance analysis, based on multi-epi process SJ MOSFETs, analytical model has only N, P pillar width and doping concentration parameter. But applying a conventional charge balance principle to trench filling process, easier than Multi-epi process, is impossible due to the missing of the trench angle parameter. To achieve much more superior characteristics of on-resistance in trench filling SJ MOFET, the appropriate trench angle is necessary. So in this paper, modulated charge balance analysis is proposed, in which a trench angle parameter is added. The proposed method is validated using the TCAD simulation tool.

• 전기전자학회논문지
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• 제22권2호
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• pp.455-459
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• 2018

In this paper, proposed a multi-channel charging control strategy for electric vehicle. This control strategy can adjust the charging power according to the calculated state-of-charge (SOC). Electric vehicle (EV) charging system using Particle Swarm Optimization (PSO) algorithm is proposed. A stochastic optimization algorithm technique such as PSO in the time-of-use (TOU) price used for the energy cost minimization. Simulation results show that the energy cost can be reduced using proposed method.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.392-394
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• 2002

Yoke simulator has been made for understanding beam movements in the deflection fields of the CRT. Consisting of the modeler, solver and post-processor, the simulator makes yoke model (conventional and rectangular yoke) and calculates charge sources and magnetic filed by BEM (boundary element method). This system supports a number of charge elements (line and surface charges) and beam movements can be predicted by the system.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2000년도 추계학술대회논문집
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• pp.77-80
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• 2000

In order to determine what influences the interfacial charge in EPDM/XLPE laminates, We used PEA (pulsed electroacoustic) method. Interfacial properties such as space charge accumulation and breakdown strength in crosslinked polyethylene (XLPE)/ethylene-propylene-diene monomer (EPDM) laminates were investigated. Interfacial charge develops when the EPDM is laminated with XLPE. It showed the positive polarity same as the simulation in case on intercase of EPDM/XLPE. In case of coupling agent added silicone oil, as increasing the content of coupling agent, the interfacial charge decreased. Details of the results are given and their origins discussed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1925-1928
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• 1996

In this work, the behavior of conducting wire type particles existing inside the cylinder type coaxial electrode has been systematically investigated by charge simulation method and electrostatic force analysis from the view point of the acquired charging before being lifted off into the gap under the high ac voltage. Spheroidal charge are adopted as a image charge for the CSM analysis in order to calculate the acquired charges of the particles which are erected on the surface of the outer electrode. For this purpose, different material of the particle and their lengths and diameters have been considered in view to calculate their lift-off field, acquired charge and to understand their effect on the lift-off voltage. The results imply that the particle lengths and diameter have an different influence on the particle behavior in GIS system.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 추계학술대회 논문집
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• pp.77-80
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• 2000

In order to determine what influences the interfacial charge in EPDM/XLPE laminates, We used PEA (pulsed electroacoustic) method. Interfacial properties such as space charge accumulation and breakdown strength in crosslinked polyethylene (XLPE)/ethylene-propylene-diene monomer (EPDM) laminates were investigated. Interfacial charge develops when the EPDM is laminated with XLPE. It showed the positive polarity same as the simulation in case on intercase of EPDM/XLPE. In case of coupling agent added silicone oil, as increasing the content of coupling agent, the interfacial charge decreased. Details of the results are given and their origins discussed.

• 대한전기학회논문지
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• 제32권9호
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• pp.297-304
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• 1983

본 논문은 전하중첩법과 유한요소법을 결합하여 전계를 계산하는 것을 다루었다. 이 방법은 전하중첩법과 유한요소법의 단점을 보완하고 장점을 살리기 때문에 무한원을 포합한 장, 다매질장, 공간전하장 등의 전계계산을 적용할 수 있다. 이방법에 의해서 축대칭장과 2차원장의 전계계산에 필요한 Computer Program이 개발되었으며 비교적 정확학 계산을 얻었다.

• 대한전기학회논문지:전력기술부문A
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• 제50권12호
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• pp.556-560
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• 2001

To solve aeolian noise, we have tried several special conductor bundles equipped with spiral rod and one kind of low aeolian noise conductor with a special shape. Charge simulation method was applied to analyze electric field distributions of them in transmission line and corona cage for investigating the corona characteristics. This paper describes the electric field distributions and the performances of audible noise and radio interference from the special bundles in 765 kV transmission line by using corona characteristics obtained from corona cage simulation.