• Journal of the Institute of Electronics Engineers of Korea SC
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• v.45 no.5
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• pp.44-51
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• 2008

UV lamp systems have been used for cleaning of display panels of TFT LCD or Plasma Display Panel (PDP). However, the needs for high efficient cleaning and low cost made high voltage plasma cleaning techniques to be developed and to be improved. Dielectric-Barrier Discharges (DBDs), also referred to as barrier discharges or silent discharges have been exclusively related to ozone generation for a long time. In this paper, a 6kW high voltage plasma power supply system was developed for LCD cleaning. The 3-phase input voltage is rectified and then inverter system is used to make a high frequency pulse train, which is rectified after passing through a high-power transformer. Finally, hi-directional high voltage pulse switching circuits are used to generate the high voltage plasma. Some experimental results showed the usefulness of atmospheric plasma for LCD panel cleaning.

• Proceedings of the KIEE Conference
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• 2000.07e
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• pp.29-32
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• 2000

Ozone has been widely applied to many industrial fields because of its strong oxidation effects. Therefore, the studies have been progressed for the effective and high concentration of one generation. The silent or surface discharge have been mainly used for high concentration ozone generation until now. But these two types of ozone generators have shortcomings to be improved. In this study, the ozone generator which improved the shortcomings of above two type of ozone generators was proposed and manufactured for high concentration ozone generation. And the proposed ozone generator could generate the surface and barrier discharge simultaneously. For this purpose, a mesh type discharge electrodes were proposed and the experiments were fulfilled as a function of the widths and spacings of mesh electrodes and gap spacings between the dielectric barrier and mesh electrode. When the width of mesh electrode[WM] and spacing of mesh electrode[SM] are 0.3[mm] and 0.8[mm] respectively, the maximum ozone concentration of 2.96[vol%] was obtained at 5.6[kV], 830[mA], gap spacing (S)=0.65[mm].

• The KSFM Journal of Fluid Machinery
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• v.8 no.2 s.29
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• pp.23-30
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• 2005

The rotary compressor is widely used in the air conditioner because it is efficient and compact. Recently, the need for silent and efficient compressors is much stronger than the past. The new type muffler was invented to reduce the noise level and to improve the efficiency. The new type muffler that has two side discharge holes and dome shape resulted in much lower overall noise level, especially noise levels around 1kHz than the old type one of one center discharge hole in the acoustic spectra. Also it showed a higher efficiency of air conditioner by lowering oil discharging amount of a compressor than old type one of a rectangular shape and two side discharge holes. The noise reduction and efficiency improvement by the new type muffler were verified by tests for votary compressors and air conditioners.

• The Transactions of the Korean Institute of Power Electronics
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• v.6 no.5
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• pp.460-466
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• 2001

The oxidizing power of ozone is the greatest of all commercially available oxidizers and thus ozone is taking the place of chlorine for water treatment. For energy-effective treatment of water, ozone should be generated in high concentration. A silent glow discharge ozonizer is high effective in industrial aspect and thus is the most widely used. We found that the key parameters associated with the ozone generation rate are the driving voltage of the discharger, the discharge rate and the temperature of the ozone generation tube. For an easy control of these parameters, we build a monitoring system with graphical user interface. This system is based on Windows-98 PC, programmed with C++ and LabView.

• Journal of Korean Society of Environmental Engineers
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• v.28 no.5
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• pp.543-548
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• 2006

This paper is to be researched into ozone generation character of Bi-Ti-Si type high dielectric ceramic catalyst discharge tube. And conditions of basic experiment are the outside diameter of discharge tube : 52 mm, the length of discharge tube : 350 mm, the frequence : 900 Hz, the temperature of cooling water : $25^{\circ}C$, quantity of flow : 5, 10, 20 L/min, pressure : 1.2, 1.4, 1.6 atm, and distance of discharge gap : 0.4, 0.6, 0.8 mm. Ozone generation characteristics were measured to consumption power. At quantity of flow : 20 L/min, discharge gap : 0.6 mm, pressure : 1.6, and consumption power : 150 W, Maximum ozone generation efficiency of 175 g/kWh was obtained. And a range of maximum ozone generation efficiency was measured below the flow quantity of 20 L/min at below pressure of 1.6 atm. However, Maximum ozone generation efficiency was measured over the flow quantity of 20 L/min at over pressure of 1.6 atm.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05e
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• pp.57-60
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• 2003

This paper explained electric field distribution's characteristics of dielectric pellets with a shape of ball to voltage. When discharge gap of electrode and input voltage are each 20[mm], 10000[V], the electric field simulation results of dielectric pellets with a shape of ball with relative dielectric constant of several kind measured stronger electric field near electric pellets with a shape of ball of ${\phi}5$[mm] than $1{\phi}$[mm] and $3.33{\phi}$[mm] at atmosphere. And the maximum electric field of dielectric pellets with a shape of ball over ${\phi}5$[mm] increased about 5[%] to maximum electric field of electric pellets with a shape of ball ${\phi}5$[mm]. And the result of simulation, when relative dielectric constant of dielectric pellets with a shape of ball is 100, it measured about 90[%] of maximum electric field of dielectric pellets with a shape of ball with relative dielectric constant over 1000.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1576-1577
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• 2011

오존은 수처리공정에서 사용되고 있는 산화제중에서 염소 다음으로 가장 강력한 산화력을 가지고 있는 물질이다. 그에 따라 상 하수도, 축산폐수, 농약등 오염원을 효과적으로 제거하는데 활용이 확대되고 있는 추세이다. 또한 2차적인 오염물질이 없다는 점에서 더욱 다양한 분야에서 적용되고 있다. 현재 오존을 발생시키기 위해 다양한 기술이 개발되고 있으며, 그 중에서 1857년 Siemens에 의해 개발된 무성방전식 오존발생기가 최근 가장 널리 사용되고 있다. 본 연구에서는 무성방전식 오존발생기에 대한 최적 운전점을 도출하기 위한 시뮬레이션을 JAVA로 프로그램하고 실제 운영현장에 적용하여 결과를 도출하였다.

• Proceedings of the KIEE Conference
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• 2001.07c
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• pp.1759-1761
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• 2001

In this paper, a co-axial cylinder type ozonizer using silent discharge known as an ozone generation was designed and fabricated. A cooling system was installed to investigate the characteristics of ozone generation in accordance with temperature change of the supplied gas known as an important factor. The characteristics of ozone generation were investigated in accordance with the existence of cooling system and the change of cooling temperature.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.11a
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• pp.675-678
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• 2004

Ozone is usually generated from oxygen gas using a silent discharge apparatus and its concentration is less then 10 mol%. An ozone condensation system is constructed for metal oxide thin film fabrication. Ozone is condensed by the adsorption method, which is widely used for the growth of oxidation thin films such as superconductor. Highly condensed ozone is analyzed by three methods; ultraviolet absorption, thermal decomposition and Q-mass analyzing methods. Thermal decomposition method is most effective in the highly condensed ozone region and its method is superior to Q-mass analyzer for determining ozone concentration because of the simplicity of the method.

• Proceedings of the KIEE Conference
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• 2000.11c
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• pp.570-572
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• 2000

The characteristics of ozone generation were investigated in accordance with varying the diameter of internal electrode in an ozonizer using RF power source. The characteristics of ozone generation were improved with the diameter of internal electrode increased, but thermal loss was increased. Therefore, it was found that it is inevitable that the cooler has to be installed in an ozonizer which uses RF power source.