• Progress in Superconductivity
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• 제3권2호
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• pp.252-256
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• 2002

We studied YBCO films for current limiting of the resistive type which utilizes a transition from superconducting to normal state caused by exceeding critical current. The films were deposited on sapphire substrates and covered by gold top layer. The current limiting element consists of 2 mm wide YBCO stripes connected in series. A serious problem in using YBCO films for current limiting is inhomogeneities caused by imperfect manufacturing. Therefore simultaneous quench is a difficult problem when elements for current limiting are connected in series. So some researchers have recently proposed using magnetic field and heating for simultaneous quench. We have measured extended exec trim field-current density(E-J) characteristics for current limiting elements of YBCO films in applied magnetic field of 0 - 130 mT. And we have investigated quench characteristics in current limiting elements and between elements of YBCO films in applied magnetic field. The result of the experiments show that the presence of applied magnetic fields induces uniform quench distribution fur the stripes in element at $50V_{rms}$, otherwise non-uniform quenches were observed. And simultaneous quenches between elements were investigated at $150V_{rms}$. We suggest that suppressing the critical current by increased fields due to fault current effectively forced the stripes of higher $J_{c}$(0) to quench, resulting in equalizing quench times.s.s.s.

• 한국정보통신학회논문지
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• 제11권4호
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• pp.641-647
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• 2007

전자무역에서 WMS는 물류산업을 보다 편리하고 효율적으로 개선시키는데 많은 부문에 기여했다고 할 수 있다. 그러나 운영 측면에서 볼 때 전자데이터 등의 폭발적인 수요 폭주로 인하여 운송방법 등의 기술적인 문제점들이 적잖게 노출되어 있는 것이 현실이다. 따라서 우리나라가 물류정보 중심지로 성장하기 위해서는 전자무역 ERP 관리하의 SCM 기반구축과 WMS를 충분히 활용하여야 할 시점이다. 본 연구의 목적은 전자무역 WMS의 효율적인 운영을 위하여 첫째, 우리나라 전자무역의 부분별 종합 WMS의 플로우 과정을 고찰하고 둘째, 전자무역 WMS의 문제점과 개선방안을 제시 하고자 한다. 본 논문은 WMS의 기술적인 방향을 제시하기보다는 실무적 관점에서 해석적 기초를 제시하는데 그 목적이 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전력기술부문
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• pp.116-118
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• 2005

IEC 60364-4-44 provides rules for the protection against the effects of conducted and radiated disturbances on electrical installations. Especially this standards deals with the protection of low voltage facility against the ground fault in the high voltage side of power distribution system. Many countries defines the regulations on the use and production of electrical facilities based on their own power system and technical references which are considered to be suitable for themselves. The background of circuit of IEC 60364 is based on the ungrounded system as most of European countries adopt. However, since domestic ground system is multi-grounding system different from European system, it is necessary to evaluate or prove the effect of the IEC 60364 for introducing and applying it to the domestic grounding system as a Korean standard. This paper presents the establishment of test field to get background data to introduce the IEC 60364 and to evaluate the standard is applicable or not to domestic rule for the protection against ground fault through the related test.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2001년도 학술대회 논문집
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• pp.102-103
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• 2001

In this paper we calculate the AC Loss in the superconducting slab carrying ac transport current. Magnetic diffusion equation for computation of the electric field and current distribution are based on Maxwell's equations and non-linear constitutive equation. The E-J characteristics of superconductor are applied to computation. We will present the result of the high-temperature superconductor case comparison with the slab of low temperature superconductor.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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• pp.127-134
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• 2006

Based on a weakly non-Gaussian theory the occurrence probability of freak waves is formulated in terms of the number of waves in a time series and the surface elevation kurtosis. Finite kurtosis gives rise to a significant enhancement of freak wave generation in comparison with the linear narrow banded wave theory. For fixed number of waves, the estimated amplification ratio of freak wave occurrence due to the deviation from the Gaussian theory is 50% - 300%. The results of the theory are compared with laboratory and field data.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
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• pp.643-646
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• 2005

We present new ramp-reset waveforms that realize fast addressing in AC-PDPs. These waveforms distort the distribution of wall charges on the surface of a phosphor layer: hence, the enhanced electric field helps to ignite a cell faster. They also reduce the black luminance: the divide of erasing ramp down discharges into two parts, i.e. a surface discharge and a vertical discharge, makes lower luminance.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2117-2119
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• 1999

In this paper, the electric fields inside GIS with metal impurity is analysed by the use of 3 dimensional Surface Charge Method. We find the metal impurity makes electric field distribution inside GIS non-uniform and causes breakdown of $SF_6$ gas in GIS.

• The Journal of Asian Finance, Economics and Business
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• 제9권10호
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• pp.251-264
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• 2022

This study explores e-banking variables that affect client satisfaction in the Saudi Arabian banking industry spanning three dimensions: reliability, security concerns, and efficiency, which were chosen as predictors of customer satisfaction in the e-banking industry. A field survey using a self-administered questionnaire as a data collection instrument was adopted to collect the required data from a convenience sample of 250 participants of Saudi banking customers. The overall fit of the hypothesized model was tested using linear regression to find the rate of the independent factors' impact on the dependent variable. The study's findings revealed that there is a statistically significant relationship between the three dimensions and customer satisfaction in Saudi e-banking, with the largest impact being that of reliability, followed by efficiency, and finally security concerns. Also, the study found there was a significant difference in reliability which was considered more important for Saudis and there was a significant difference in efficiency, which was considered more important by males. The findings of this study suggest that these three dimensions are instrumental in e-banking customer satisfaction and that banks can gain a competitive edge by providing better services in these dimensions to sustain and develop their performance in the increasingly globalized banking industry.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 A
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• pp.137-140
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• 1995

This paper describes the test results of magnetic field distributions of superconducting MRI magnet in an insert dewar. To get a very high homogeneous magnetic field, various shim coils are installed besides the main magnet. The operating currents of each shim coils are obtained from the exact measurements of the magnetic field. In this paper, we report the test results of the magnetic field distribution measurements with various shim coils.

• Weed & Turfgrass Science
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• 제4권3호
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• pp.188-198
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• 2015

본 연구에서는 한국의 동부지역(강원도, 경상남도, 경상북도)의 밭에서 발생하는 잡초의 분포현황 및 생태적 특성을 파악하였다. 조사결과 밭내부(IDF), 밭둑(EDF), 경사면(LS)에서 46과 117속 127종 1아종 22변종이 포함된 150분류군이 조사되었고 밭내부에서 83분류군이, 밭둑에서 133분류군이, 경사면에서 105분류군이 확인되었다. 우점종을 나타내는 상대기여도(rNCD)는 밭내부에서는 쇠비름, 밭둑에서는 바랭이, 경사지에서는 환삼덩굴이 가장 높게 나타났다. 과별로는 국화과, 벼과, 마디풀과, 콩과의 출현빈도가 높았다. 생활형은 Th-R5-D4-e로 특징지어졌으며 세부 서식처도 동일한 양상을 나타내었다. 교란지수는 작물을 직접적으로 재배하는 밭내부가 83.1%로 가장 높았고 다음으로 밭둑 68.4%, 경사면 62.9% 순이었고 귀화율도 밭내부가 28.9%, 밭둑이 22.6%, 경사면 20.0%로 조사되었다. 밭에서 서식처의 안정성은 밭잡초의 교란지수, 귀화율, 제초관리, 토지이용 강도나 인위적 간섭에 의해 영향을 받는 것으로 판단되었다.