• 전기학회논문지
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• 제59권10호
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• pp.1862-1868
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• 2010

A corona motor, as one of a powerful cooling means of microelectronic devices, has been employed because of its very simple structure of no coils and no brushes. In this paper, the effect of polarity of applied voltage and the number of blade corona electrodes on the fundamental properties of rotation of the motor was investigated. The I-V and rotation characteristics of the blade corona electrode were significantly different from the different polarities of applied voltages and the blade corona electrode numbers, due to the different space charge effect resulted by the different migration mobility of the positive and negative ions generated near the blade corona electrode tip of the rotor of the motor. The rotation speed of the motor was influenced significantly by the polarity of corona discharge, the number of blades, and mass of rotor. At the same corona current, an effective rotation can be obtained with the positive corona caused by the lower ion mobility. On the other hand, the higher rotation speed can be obtained with the negative corona resulted from its higher corona current. The highest rotation speed and energy efficiency can be obtained with the rotor having 4 blades.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 C
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• pp.1375-1377
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• 1995

This paper describes characteristic of ozone Generation by positive streamer corona discharge. Experiments were carried out with needle-plane Electrodes in a pyrex glass tube, in order to in crease the ozone yield. The results of Experiments confirmed needle an gle $45^{\circ}$ Gap spacing 15mm is adaptive Electrode arrangement.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 The Korea-Japan Joint Symposium
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• pp.96-96
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• 2003

In this article modification of wool fibers and fabrics by pulse corona discharge and enzymes, in particular purified keratinase with a single component has been carried out to improve their surface properties. The shrinkproofing, tensile strength, weight loss, and the primary hand values calculated from the mechanical properties of the dual treated wool fabrics were investigated. In addition, the surface morphology of wool fiber was observed under the dry and wet conditions using an environmental SEM, ESEM.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2001년도 추계학술대회 논문집
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• pp.417-418
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• 2001

석탄의 연소과정에서 필연적으로 발생하는 황(SOx) 및 질소산화물(NOx)을 제거하기 위한 방법중 하나인 동시처리기술중 PCD(pulsed corona discharge) 반응기의 반응조건은 첨가제의 성분 및 성상에 따라 다양하게 바뀌며 황 및 질소 산화물 제거반응에 큰 영향을 미친다(Akira M., 1995). 따라서 PCD 반응기에 유입되는 가스는 발전소 배기가스 조건을 적용한 상태에서 주입하는 첨가제의 종류 및 양을 변화시켜, 각종 첨가제의 주입이 탈황, 탈질 반응에 미치는 상승효과를 조사하였고 PCD 반응기에서 첨가제의 반응 현상을 규명코자 하였다(송영훈, 1997). (중략)

• 접착 및 계면
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• 제7권3호
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• pp.26-33
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• 2006

나일론 직물들이 전류세기 5, 10, 15, 20 A, 공급속도 5, 10, 15 m/min로 코로나 처리되었다. 나일론 직물의 표면변화를 X-ray 회절장치, 주사전자현미경(SEM)과 X-ray 광전자분석기(ESCALAB)로 확인하였다. 또한 물리적 성질의 변화를 인장 인열강도, 접착 및 습윤강도를 통하여 측정하였다. 접착에 사용된 접착제는 열경화성 반응형 폴리우레탄 핫 멜트 접착제이다. 대기압에서 코로나 방전처리에 의해 나일론 직물에 관능기들이 도입되어졌고, 그 결과 접착력은 향상되었다. 코로나 처리된 나일론 직물의 접착강도는 전류 세기가 증가할수록, 공급속도가 감소할수록 증가하였다.

• 조명전기설비학회논문지
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• 제29권11호
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• pp.74-81
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• 2015

In the measurement of atmospheric static electric field, it is important to know characteristics of corona discharges caused at the tip of test electrode. This paper presents the fundamental data of DC corona discharges that occurred at the tip of a needle-shaped electrode placed in the homogeneous background electric field which simulates the atmospheric static field under thundercloud. The major characteristics of interest for this purpose are the polarity effect of corona discharges and the magnitudes and time intervals of corona current pulses. The experimental set-up consists of the plate-to-plate configuration with a needle-shaped protrusion, DC power supply, and voltage and current measuring devices. As a result of experiments, the polarity dependence of corona pulses is significantly pronounced. The time intervals between successive corona pulses in the negative polarity is much longer than those in the positive polarity. The time intervals for both polarities is drastically decreased as the applied electric field is increased. Also the magnitudes of the positive corona pulses are slightly changed with an increase in applied electric field, but those of the negative corona pulses are linearly increased with increasing the applied electric fields.

• 한국안전학회지
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• 제33권1호
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• pp.41-46
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• 2018

Experiments were carried out the phenomenal observation on effect of corona treated hotmelt laminating film in process of manufacture by 2 kinds of rolling speed and electric power variatons. Surface treatment by corona which is exposure of film surface to electron of ion bombardment, rather than mere exposure to active species, like atomic oxygen or ozone, can enhance adhesion by removing contaminant, electret, roughening surface, and introducing reactive chemical group. Reactive neutrals, ions, electron and photons generated during the corona treatment interact simultaneously with polymers to alter surface chemical composition, wettability, and thus film adhesion. However, it is highly recommended that extensive chains scission is avoided because it can lead to side-effect by forming sticky matter, resulting in dropouts. This paper reviews principles of surface preparation of polypropylene substrate by corona discharging. In addition, the experimental section provides a description of parameter optimization on corona discharging treatment and its side-effect. Experimental results are discussed in terms of surface wetting as determined by contact angle and SEM measurements. When the rolling speed of the film decreased from 1.666 [m / sec] to 0.083 [m / sec], contact angle decreased from $80[^{\circ}]$ to $64[^{\circ}]$, and the wettability was greatly improved. As the supply power increased from 0.4 [kVA] to 2 [kVA] at the corona discharge surface treatment, the contact angle decreased from $77[^{\circ}]$ to $65[^{\circ}]$, and the wettability was greatly improved.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 추계학술대회 논문집
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• pp.215-218
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• 2009

In this paper, there analyzed the UV behavior and detection images due to corona discharge of insulators at 22.9kV. As the results, the shapes of UV detection images are jellyfish, sunflower, and amoeba type. Generally, the jellyfish and sunflower type appeared in air discharge. In surface discharge, Amoeba is generated. Also, there are classified 8 patterns such as sunflower A or B, jellyfish A or B, amoeba A, B, C, D. This method of the facilities assessment has an immediate effect in the field.

• E2M - 전기 전자와 첨단 소재
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• 제10권8호
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• pp.807-811
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• 1997

In this paper we have investigated the removal characteristics of NOx by pulsed corona discharge with a multi-pointplane electrode where a magnetic field is applied in the discharge region. The efficiency of NOx removal was measured and analyzed as a function of pulse frequency gas flow rate NOx initial concentration magnetic flux density. In this result the highest removal efficiency of NOx was obtained at the following operating conditions; the frequency =400[Hz] gas flow =1[$\ell$/min] initial concentration= 400[ppm] and magnetic flux density=0.36[T].

• 설비공학논문집
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• 제13권10호
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• pp.939-946
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• 2001

This study investigates the electrical and collection characteristics of a wide plate spacing electrostatic precipitator (ESP), using a pilot-scale one. Electrical operating characteristics and collection efficiency were measured for various shapes of discharge electrodes. The collection plate spacing ranged from 300 to 550 mm. Results of electrical characteristic and collection efficiency tests as a function of collection plate spacing, discharge electrode type, applied voltage, and particle diameter were obtained. Increasing the collection plate pitch and altering the corona electrode geometry was found to increase the collection efficiencies without increasing input power requirement. The best efficiency is achieved for the discharge electrode of twisted pin type.