• 한국진공학회지
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• 제8권2호
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• pp.127-135
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• 1999

Nickel oxide films were prepard by using the electron beam evaporation technique. Coloring and bleaching experiments for cyclic durability were repeated in KOH electrolyte by cyclic voltammetry. Visible spectrophtometry was used to assess the stability of the transmittance in the degraded films. X-ray photoelectron spectroscopy results showed that the grain surface are oxygen-rich compared to the grain interiors in a NiO film. Open circuit memory of colored films is about 400hours in lN KOH. The rate of self discharge was evaluated by measuring the transmittance at 550nm of a fully oxidized NiO film. The rate of self discharge was increased polynomially with time and the film is nearly bleached after about 400hours. It was also found that the degraded film by repeated cycles in the KOH solution changed the grain shape of film surface The film prepared under a vacuum pressure of $3\times10^{-4}$ mbar was found to be rather stable when subjected to the repeated coloring and bleaching cycles in KOH electrolyte. Band theory applied to explain the electrochromic mechanism was discussed.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.224-227
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• 2007

The reconstruction characteristics of MgO (111) textured protective layer by over-frequency accelerated discharge in AC-PDP were investigated and correlated to the variations of electronic structures. The reconstruction process and exaggerated grain growth (EGG) were explained by defect-assisted 2-D nucleation and growth mechanism combined with charged cluster model.

• 대한전기학회논문지
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• 제45권3호
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• pp.426-431
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• 1996

It is well known that the understanding of the complex mechanism of magnetoplasma is closely related with understanding of the collective behavior of discharge plasma parameters such as the cathode-sheath potential, cathode-sheath thickness, electron temperature, electron density, and ambipolar diffusion. In this paper, some of the relationships between these plasma parameters and magnetic field is investigated experimentally with a Langmuir probe in the magnetoplasma generated by D.C diode system. It is found that when magnetic field is increased, cathode-sheath potential, cathode-sheath thickness, and ambipolar diffusion are decreased. In addition, peak ion density obtained as a parameter of ionic signal voltage by Faraday cup method is independent of magnetic field. (author). 9 refs., 11 figs.,1 tab.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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• pp.1525-1526
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• 2006

Electrical current always travels through the minimum resistance path. In this paper, we are studied on the direction and formation of carbonized conductive path according to surface leakage between electrodes. The analysis of characteristics of the arc discharge as surface is broken down between exposed live parts. Using the HSIS(high speed imaging system, 100,000fps, redlake ltd., USA), it took photographs by arc growth mechanism occurred in on/off surge, ground fault and discharge between electrodes. Therefore, it recommended for results of technology development and application such as theoretic verification of an arc direction and economic security according to a technology about connecting arc generation in surfaces of insulators. Hereafter, it expected effects that application of energy utility technology through the arc control.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 제4회 영호남학술대회 논문집
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• pp.58-63
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• 2002

For the experiment the four types of spacer were distinguished by arrangement. The flashover characteristic on each types of spacer was investigated and the flashover phenomena were observed to understand breakdown mechanism in liquid nitrogen($LN_{2}$). The spacer should be placed interior coil as an insulator, a cooling channel and s supporter of structures. The simulated electrode used in the experiment was made from five turns of HTS tape. Experimental results revealed that multi-layer and barrier effects did work well in Air but did not in $LN_{2}$. These result suggested that the flashover in LN2 caused by the bubbles due to partial discharge at micro gap, g. The flashover characteristics decreased to 70% when g is 0.2 mm. The degradation was improved by even treatment on surface of coil electrode.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1997년도 추계학술대회논문집; 한국과학기술회관; 6 Nov. 1997
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• pp.196-201
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• 1997

In point of noise and vibration, it is easy to occur a noise and vibration, because the reciprocal compressor is composed of crank shaft, rod piston and etc. Therefore, it is important to understand the mechanism of reciprocal compressor. In this study, we measured the sound pressure level of compressor. There are two dominent frequencies. The first of one results from the suction part. In suction process, the suction valve flutteres, and it produces the noise of the first frequency. The other results from the structural vibration of the shell resonated by discharge pipe. Thus, to reduce the noise of compressor, it will be most efficiency to redesign muffler for the first frequency and discharge pipe for the second frequency.

• 대한전자공학회논문지
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• 제24권1호
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• pp.73-78
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• 1987

The physical mechanism of a RF discharge used in photoresist stripping and etching process are not well understood and, plasma reactor design and the determination of optimum operating coditions are done largely on empirical basis. We analyzed the discharge process through the measurement of plasma characteristics and applied out results tothe analysis of the photoresist stripping. We investigated the effects of plasma electron density, neutral oxygen gas pressure and electrode temperature on the stripping rates and related their effects with the characteristics of plasma.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.211-214
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• 2002

We present gray scale implementation method based on QMA driving technique. We clarified the mechanism of wall charge quantization through discharge current measurement. We used three wall charge states to implement gray scale. The cells would be one of fully-ON, half-On, and OFF states. We built a five sub-fields 243 level gray scale with sustain pulse count of 2, 6, 18, 54, and 162.

• Journal of Astronomy and Space Sciences
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• 제7권1호
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• pp.1-10
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• 1990

The thermodynamic distribution of the vibrational states of ozone coupled with anharmonic predissociation produces an unusual isotopomeric pattern of oxygen molecules. The model presented here explains the experimental data obtained from the electric discharge of oxygen gas to produce ozone condensed on a quartz at 77K.

• 조명전기설비학회논문지
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• 제13권3호
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• pp.34-39
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• 1999

본 연구에서는 랑그뮤어 푸로브법을 이용요하여 고주파 유도결합 플라즈마에서 전자온도와 전자밀도를 측정하였다. 실험의 공통조건은 압력 10∼40[mTorr], 입력파워는 100∼600[W]이고, 공간분포는 측정에서의 아스펙트비(R/L)는 2로하였다. 전자온도와 전자밀도의 의존성을 측정한 결과 입력파워에서는 전자온도는 약간 증가하는 경향을 보이고 있지만 전자말도는 입력파워가 100∼250[W]까지는 증가율이 완만하고 450[W]에서 포화하는 것을 알수 있었다. 압력에 대한 의존성은 압력이 낮을수록 높은 값을 나타내고 전자밀도에서는 압력이 증가함에 따라 증가하는 것을 알 수 있었다. 전자온도의 반경방향의 공간분포는 석영창 부근에서 기판쪽으로 갈수록 감소되는 경향이 있다. 전자밀도에서는 플라즈마 중심부에서 석영창 쪽으로 약간 이동한 위치에서 피크의 값을 가지고, 석영창과 기판쪽에서는 그 값이 감소함을 볼 수 있었다. 전자온도의 축방향의 공간분포는 석영창 부근에서 기판쪽으로 감소되는 경향이 있다. 또, 전자밀도는 플라즈마 중심부에서 석영창 쪽으로 약간 이동한 위치에서 피크의 값을 가지고, 석영창과 기판쪽에서는 그 값이 감소함을 볼 수 있었다. 이상의 결과들은 유도방전플라즈마의 메카니즘의 체계적인 이해에 기여할 수 있을 것이다.