• 한국정보과학회논문지:소프트웨어및응용
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• 제27권6호
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• pp.660-667
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• 2000

본 논문에서는 필기 한글 문자열 영상에 대한 단어 분리 방법을 제안한다. 제안된 방법은 gap 의 크기 정보를 사용하여 단어를 분리하는데, 이때 gap은 문자열 영상을 수직방향으로 투영한 후 흰-런 (white-run)을 찾음으로써 구할 수 있다. 문자열 영상으로부터 얻어지는 gap들의 크기를 측정한 후, 각각의 gap을 단어와 단어사이에 존재하는 gap과 문자와 문자사이에 존재하는 gap 중 하나로 분류한다. 본 논문에서는 필기 영문 문자열의 단어 분리를 위해 제안된 기존의 세 가지 거리 척도를 채택하고 군집화에 기반한 세 가지 분류방법을 적용하여 한글 문자열의 단어 분리를 위한 최적의 조합을 선정하였다. 우편봉투 상에 작성된 주소열로부터 수작업으로 추출한 305 개의 문자열 영상을 사용하여 실험한 결과 BB(bounding box) 거리를 사용하여 순차적 군집 방법을 적용하는 경우 3 순위까지의 누적 단어 분리 성공률이 88.52% 로서 가장 우수한 성능을 보여 주었다. 또한 하나의 문자열 영상에 대한 단어 분리 속도는 약 0.05초이다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.491-492
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• 2008

This paper describes the series-gap characteristics of transmission line arrester with switching and lightning impulse flashover test. The transmission line arrester exhibited external gap because it is must not flashover with switching impulse on the other hand it is must flashover with lightning impulse. In accordance, minimum and maximum length of series-gap was determinated with these tests. As gap length is increased flashover voltage was increased in the range of 315.4 kV~496.3 kV and negative polarity exhibited a high voltage. As a result, It was thought tat the series-gap length of transmission line arrester exhibited in the range of 580 mm~1100 mm.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.484-485
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• 2007

This paper describes the series-gap characteristics of transmission line arrester with switching and lightning impulse flashover test. The transmission line arrester exhibited external gap because it is must not flashover with switching impulse on the other hand it is must flashover with lightning impulse. In accordance, minimum and maximum length of series-gap was determinated with these tests. As gap length is increased flashover voltage was increased in the range of 315.4 kV~496.3 kV and negative polarity exhibited a high voltage. As a result, It was thought tat the series-gap length of transmission line arrester exhibited in the range of 580 mm~1100 mm.

• Journal of Welding and Joining
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• 제34권1호
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• pp.68-74
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• 2016

Adoption of narrow gap welding shall be increased for the butt joint of thick plate, because the deformation and welding cost is reduced by decrease of cross-sectional area. However, sometimes narrow gap causes defects such as lack of fusion since it has small groove angle and narrow groove width. Therefore, GMAW, GTAW and SAW process shall be adopted to narrow gap welding with small bead hight and low deposition rate. In this study, Super-TIG welding using C-type strip was applied to semi-narrow gap butt joint in order to increase the welding productivity. High deposition rate 10kg/hr was obtained by high current 600A without undercut, humping bead and other welding defects. Measuring the mean and standard deviation of the melting depth to evaluate the developed processes, the fusion line type was determined by measuring the difference between maximum and minium melting depth. Furthermore, a model on arch fusion line and linear fusion line was suggested in order to prevent LF on groove wall in narrow gap butt welding.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 Techno-Fair 및 추계학술대회 논문집 전기물성,응용부문
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• pp.103-104
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• 2008

this paper describes the electric field distribution analysis along a shield gap inner vacuum interrupter(VI). The equipotential line and electric field and field vector in a VI are analysed by a finite element method and experiment at shield gap. in result, The equipotential line and electric field distribution was affected to VI shield gap. The reason is as it gets distortion of equipotential line done. finally, this paper recognized whether or not affected, and proposed gap with the most suitable shield length and an external insulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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• pp.454-456
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• 2003

This paper describes a type test results of 154 kV transmission line arrester with external gap. The test was carried on surge arrester unit and line arrester with external gap, respectively. Withstand voltage test demonstrate the voltage withstand capability of the line arrester with external series gap under the dry and wet conditions. In insulation coordination test external series gap shall be discharged every time when lightning impulse voltage with the steepness of more than 1500 $kV/{\mu}s$ are applied under the wet condition.

• 조명전기설비학회논문지
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• 제27권4호
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• pp.73-80
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• 2013

Breakdown characteristics of air in the vertical arrangement of line conductor and plane electrode in case of combustion flame on the plane electrode are examined by the application of AC. and DC voltages to the gap. In order to investigate the effect of paraffin flame on the breakdown characteristics of air, flashover voltages are measured according to the variation of the gap length and the horizontal distance between the flame and the line conductor. As the result of the experiment, flashover voltages are substantially lowered down to 29.8% in case of the AC voltage, and 16.1% in case of the negative DC voltage, when in the presence of the flame. from 100% when in the absence of flame. Flashover voltages of air in the range of smaller than 3㎝ at the horizontal distance are increased in the proportion of the gap length and the horizontal distance in case of both AC and negative DC voltages. But before the flashover occurs, the flame is extinguished by such corona wind that is produced from the line conductor when the gap length and the horizontal distance reach to a certain degree. The effect of relative air density and the phenomenon of thermal ionization are analysed as the reduction factors of flashover voltages, due to high temperature of the flame.

• 전자공학회논문지A
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• 제28A권11호
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• pp.874-879
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• 1991

The effect of air gap between specimen and jig on the material constant (permittivity, permeability) and attenuation characteristics of electromagnetic wave absorbers in the coaxial line method was investigated. The presence of a air gap made both permittivity and permeability measured lower than true value, and the tendency was greater in the case of permittivity. An inner gap compared to an outer gop was found to yield a larger difference between measured and true values. The effect of air gap was measured for a Ni0.3Zn0.7Fe2O4, with the gap eliminated by metallizing with Ag-paste. The measured characteristics were in good agreement with corrected values by calculation.

• 마이크로전자및패키징학회지
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• 제8권3호
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• pp.69-75
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• 2001

후막광식각 기술은 스크린 인쇄 등의 일반적 후막공정에 노광 및 현상등의 리소그라피 공정 을 접목시킨 새로운 기술이다. 그린시트를 적층한 후 감광성 Ag 페이스트를 도포하고, 패턴을 노광, 현상, 동시소성하여 스크린 인쇄법으로는 어려운 25 $\mu\textrm{m}$ 선폭과 25 $\mu\textrm{m}$ 선간공백을 구현하였다. 알루미나 기판을 사용하였을 경우에도 유사한 방법으로 20 $\mu\textrm{m}$에 가까운 선폭이 구현 가능하였으며, 노광량과 현상시간이 미세라인 형성에 있어서 가장 중요한 공정변수임을 확인하였다. 또한, 광식각 기술을 이용하여 정밀도가 높고 고주파 대역에서 전송특성이 우수한 microstrip 전송선로와 series gap 공진기를 제작하여, 이로부터 기판의 유전률 및 유전손실을 계산하였다.

• 대한전기학회논문지:전력기술부문A
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• 제51권1호
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• pp.23-28
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• 2002

In order to survey the radiation characteristics of pure line noise of unwanted noise from overhead high voltage AC transmission lines, a disk type gap noise generator was manufactured. Disk size which decides capacitance between the noise generator and earth was selected through preliminary indoor experiments and analysis by using surface charge method. The capacitance is one of principal parameters related to the injection of a proper noise current into lines. On the basis of the capacitance obtained from calculation, 5mm of space was given to the gap of the noise generator to be installed o test line and an aluminum disk of 60cm radius was made. The field experiments were performed with the noise generator hung on the Kochang 765 kV full scale test line. As the results, the useful data which can be used to analysis the radiation characteristics of noise from transmission lines were obtained. Those are the directivity of antenna toward the line, lateral profiles, frequency spectra, height pattern and so on.