• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.05a
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• pp.68-73
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• 2000

An arc model based on the N-S equations modified by adding an energy source term to take account of the arc is developed and solved using Taylor-Galerkin FEM. The numerical method is applied to the simulation of the interruption process of a puffer type GCB. Moving boundary conditions of the arc chamber during operation is taken into account. The thermal interruption capability of an actual puffer type GCB will be predicted and compared with that of the measured result.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2220-2222
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• 2005

Epoxy Insualtion spacers for supporting the conductors and partitioning the sections in $SF_6$ Gas insulated Switchgear(GIS), require higher electrical, Thermal and mechanical reliability with other principal components in GIS to be operated without any failure in use. In this paper, we describe the results of the performance evaluation of electrical and mechanical properties for extra high-voltage GIS according to KEPCO spec. and the requirements of the insulators for GIS specified by IEC 62271-203(2004).

• Proceedings of the KIEE Conference
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• 2003.11a
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• pp.392-395
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• 2003

The study of electric field analyses has been conducted on two kinds of bushings for 17.5kV $SF_6$ gas insulated recloser. In this paper, two model bushings and input conditions for the analyses are described in detail. The results of the electric field analyses are presented and compared with to find out the better design in two bushings. Finally some suggestions are given for improving the insulation characteristics of the bushings.

• Proceedings of the KIEE Conference
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• 2004.05b
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• pp.125-127
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• 2004

We have developed the external-type PD sensors for detecting of the ultra high frequency (UHF) signals in various type of GIS. Sufficiently high sensitivity and accuracy for practical use were achieved for the PD sensor. The experience at the fields and the criteria for the judgment are also discussed in detail.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1424-1425
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• 2007

In this paper approves AC high voltage by experimental GIS(Gas Insulated Switchgear) chamber and AC 300[kV] power source to study breakdown characteristics by pressure(P) change and change of electrode distance(d) at AC high voltage of Imitation Air(I-Air, $N_2$ : $O_2$ = 79[%] : 21[%]) to alternate $SF_6$ and achieved research. Gave P change of I-Air to study I-Air's breakdown characteristics using niform fields(Sphere-Sphere electrode) and non-uniform fields(Needle-Plane electrode) and studied relations breakdown voltage ($V_B$) by each P different d.

• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.77-79
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• 2005

국내에서도 가스절연 변압기의 개발 및 상용화가 진전됨에 따라 가스절연 변압기의 예방보전기술 연구가 필요하나, 아직 국내에서는 이에 대한 연구가 기초적 수준에 머무르고 있다. 본 논문에서는 우선 $SF_6$ 가스분석을 근거로 한 내부이상 진단기술에 대하여 가스 분석시 이상여부를 결정짓는 지표 성분의 고찰 및 가스절연 변압기 특유의 이상 진단방식에 대하여 현재까지의 국내 외 연구결과를 살펴보고자 한다. 또한 가스절연 변압기에 대한 사고 장해의 미연방지 및 합리화의 관점에서 설비감시 및 이상진단을 위해 그 필요성이 큰 센서기술에 대해서도 검토하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.246-248
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• 2005

본 논문은 23kV 가스절연개폐기에서의 윤활제 고착시 발생되는 현상을 조사하였다. 내부 개폐접점부의 마찰저항을 줄이고 가동전극의 윤활한 동작을 위해 사용되는 그리스 (grease)를 과다하게 도포할 경우 고착과 함께 가동전극의 미끄럼운동에 영향을 주는 것이 확인되었다. 영향 평가로는 물성시험과 투 개방 음향특성을 분석하였다. 본 논문의 결과는 개폐장치의 제조품질 개선 및 정전감소에 기여할 것으로 사료된다.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1044-1046
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• 2005

[$SF_6$] 가스차단기를 개발하기 위해서는 차단기가 동작하는 동안에 차단기 내부에서의 유동 파라메터(압력, 밀도, 온도, 속도 등)의 값을 정확하게 분석하는 것이 매우 중요하며, 특히, 아크가 존재할 경우 열가스 이동속도에 대한 분석은 필수적이다. 본 연구에서는 small-gap 측정시스템을 이용하여 시험용차단기가 동작할 때 차단부에서 발생하는 열가스의 이동속도를 측정하기 위한 연구내용을 정리하였다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2012.05a
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• pp.218-219
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• 2012

Carbon coils could be synthesized using $C_2H_2/H_2$ as source gases and $SF_6$ as an incorporated additive gas under thermal chemical vapor deposition system. Prior to the carbon coils deposition reaction, two kinds of samples having different combination of Ni catalyst and substrate were employed, namely a commercially-made $Al_2O_3$ ceramic boat with Ni powders and a commercially-made $Al_2O_3$ substrate with Ni layer. By using a commercially-made $Al_2O_3$ ceramic boat, the production yield of carbon coils could be enhanced as much as 10 times higher than that of $Al_2O_3$ substrate. Furthermore, the dominant formation of the microsized carbon coils could be obtained by using $Al_2O_3$ ceramic boat.

• Journal of the Semiconductor & Display Technology
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• v.19 no.4
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• pp.121-125
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• 2020

With miniaturization of semiconductor, the manufacturing process become more complex, and undetected small changes in the state of the equipment have unexpectedly changed the process results. Fault detection classification (FDC) system that conducts more active data analysis is feasible to achieve more precise manufacturing process control with advanced machine learning method. However, applying machine learning, especially in supervised learning criteria, requires an arduous data labeling process for the construction of machine learning data. In this paper, we propose a semi-supervised learning to minimize the data labeling work for the data preprocessing. We employed equipment status variable identification (SVID) data and optical emission spectroscopy data (OES) in silicon etch with SF6/O2/Ar gas mixture, and the result shows as high as 95.2% of labeling accuracy with the suggested semi-supervised learning algorithm.