• Proceedings of the KIEE Conference
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• summer
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• pp.1205-1207
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• 2004

AC plasma power supply is used to control a ozone generator and a air pollution gas. AC plasma power supply is composed of power semiconductor switch devices and control board adapted SHE(Selected Harmonic Elimination) PWM method. AC plasma power supply with sinusoidal VVVF(variable voltage and variable frequency) is realized. Its output voltage range is from 0 [V] to 20[kV] and output frequency range is from 8[kHz] to 20[kHz]. Using proposed system, AC high voltage and high frequency discharge is tested in the DBD(dieletric barrier discharge) reactor, and the space distribution of a its non-thermal plasma is observed. In spite of the increasement of voltage and frequency, the proposed system have a stable operation characteristics. It is verified by the experimental results.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.05a
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• pp.165-167
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• 2002

Stable reset and address discharge are very important when they show apparent display. But the shape of reset and address discharge and wall-charge distribution change, according to the variation on temperature. Namely, it is very difficult to show exact picture. This study represents how Dynamic Margin is height and dielectric thickness. When barrier rib height is $100{\mu}m$ and dielectirc thickness is $40{\mu}m$, it is responded the most sensitively by decreasing temperature.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2179-2181
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• 2005

An experimental study on the water plasma characteristics of removal efficiency for organic contaminants in dye waste water has been investigated. In this study, dielectric barrier discharging electrodes with round shape have disposed cross each other in reactor, and pulse power was supplied to between each electrodes. Its output pulse voltage range is from 0[V] to 30[kV] and output frequency range is from 100[Hz] to 2[kHz]. Using proposed system, High frequency discharge is tested in the mixed Tone(air and water) and the space distribution of streamer corona plasma is observed. In spite of the increasement of voltage and frequency, the proposed system have a stable operation characteristics. It is verified by the experimental results.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.08a
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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.

• Journal of Surface Science and Engineering
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• v.57 no.5
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• pp.355-367
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• 2024

Hydrogen is an alternative energy source to achieve decarbonization. However, storage and transportation costs are expensive. Hydrogen carriers are attracting attention for cost-effective hydrogen production, and ammonia is the most promising material. This article explores the potential of sustainable hydrogen production through ammonia decomposition using various plasma sources with/without catalysts, and compares the hydrogen production efficiency including dielectric barrier discharge(DBD), microwave plasma, and gliding arc discharge. Additionally, we evaluate the technology readiness levels(TRLs) of these plasma processes compared to other existing ammonia decomposition technologies such as only catalytic methods and electrolysis. The results reveal the advantages and limitations of each source in terms of energy efficiency and scalability. In addition, we suggest the possibility of thermal plasma for the large-scale hydrogen production. Our findings provide valuable insights into the feasibility and practical implementation of plasma technologies for sustainable hydrogen production, contributing to the advancement of clean energy solutions and the reduction of global carbon emissions.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.381-382
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• 2003

오존은 여러 가지 산업적 응용분야를 가지고 있으며 특히, 광범위한 환경공학적 응용분야를 가지고 있다. 오존생성을 위해 개발된 무성방전 공정이 비교적 최근부터 악취 및 VOC를 포함한 대기오염 물질의 제거를 위해 활용되어오고 있으며 이러한 공정내에서 오존의 발생은 공정내의 오염물질 제거에 중요한 역할을 하게 된다. 따라서, 본 연구에서는 무성방전 공정에서 유입기체의 조성이 오존발생에 미치는 영향에 관해 알아보고자 하였다 (중략)

• Proceedings of the Korean Vacuum Society Conference
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• 2009.02a
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• pp.196.1-196.1
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• 2009

• 한국정보디스플레이학회:학술대회논문집
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• 2003.07a
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• pp.343-346
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• 2003

High Luminance PDPs have been developed using high efficient electrode structure, discharge gas and fishbone type barrier ribs. New phosphors for the good picture quality were developed. Also, New manufacturing processes such as CPBB were applied in order to reduce processing steps. High Luminance of 1,000 $cd/m^2$ was obtained in the series of 42 inch, 50 inch and 60 inch PDPs.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.11a
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• pp.415-416
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• 2000

플라즈마 화학공정을 이용한 유해대기오염물질(HAP$_{s}$ 또는 VOC$_{s}$ ) 처리기술은 기존의 촉매연소, 소각 및 흡착기술등에 비하여 낮은 초기 투자비, 여러가스의 동시처리, 소형화 또는 이동 배출원에 대한 적용이 가능하며, 대상가스의 종류나 발생량등에 따라 여러 전원(AC, Pulse, DC)을 이용한 기술개발이 가능하여 많은 연구가 진행되고 있다.$^{(1-4)}$ (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.04a
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• pp.303-304
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• 2002

VOC를 비롯한 유해대기오염물질(HAP)은 산업의 발달 및 인간의 생활방식에 따라 다양한 환경과 장소에서 발생되고 있으며, 이로 인하여 자연생태계 파괴는 물론 인체에 직접적인 피해를 주고 있다 따라서 이들 물질의 배출에 따른 환경 및 건강에의 우려는 더욱 강화된 배출규제의 요구로 이어지고 있으며 이들의 안전하고 경제적인 처리기술개발이 시급한 실정이다. (중략)