• Journal of Electrical Engineering and Technology
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• 제8권2호
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• pp.364-370
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• 2013

In the current paper, we propose a new modeling algorithm to analyze the coupling between an incident electromagnetic field (EMF) and a twisted conducting line, which is a kind of non-uniform line. Typically, analysis of external field coupling to a uniform transmission line (TL) is implemented by the Baum-Liu-Tesche (BLT) equation so that the induced load responses can be obtained. However, it is difficult to apply this method to the analysis of a twisted conducting line. To overcome this limitation, we used a chain matrix composed of ABCD parameters. The proposed algorithm expands the dimension of the previous chain matrix to consider the EMF coupling effectiveness of each twisted pair, which is then applied to multi-conductor transmission line (MTL) theory. In addition, we included a comparative study that involves the results of each method applied in the conventional BLT equation and new proposed algorithm in the uniform two-wire TL case to verify the proposed method.

• 한국항행학회논문지
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• 제22권6호
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• pp.642-647
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• 2018

본 논문은 단일 전송선로의 전기적 길이만을 조정한 비대칭 분배기 설계를 나타내었다. 이 분배기는 3개의 단일 전송선로와 고립 저항 1개 그리고 입력과 출력의 포트 종단 임피던스가 서로 다른 형태로 구성되어 있다. 분배기의 특징은 입출력 포트 그리고 출력 포트와 고립저항 사이에 연결된 단일 전송선로의 전기적 길이를 조정하여 출력 포트의 분배비율을 조정하였다. 이러한 분배기의 설계 방법을 확인하기 위해서 1:2 분배 비율의 비대칭 분배기는 $60{\Omega}$의 단일 전송선로를 이용하여 입력 포트 임피던스는 $40{\Omega}$, 출력 포트의 임피던스는 $45{\Omega}$으로 동일하게 설정하였고, 삽입손실은1.7 dB/ 5.0 dB, 반사 손실은 -30 dB이상 그리고 고립도는 -35 dB이상 측정되었다. 또한, 1:4 분배 비율의 비대칭 분배기는 $40{\Omega}$의 단일 전송선로를 이용하여 입력 포트 임피던스는 $50{\Omega}$, 출력 포트의 임피던스는 $75{\Omega}$으로 동일하게 설정하여, 삽입손실은 1.3 dB/ 6.8 dB, 반사 손실은 -12 dB이상 그리고 고립도는 -19 dB이상 되는 전기적 특성을 확인하였다. 측정된 특성 데이터는 시뮬레이션과 잘 일치함을 확인하였다.

• 전자공학회논문지A
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• 제28A권9호
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• pp.685-691
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• 1991

A broad-band 3-dB directional coupler is implemented by using cascaded exponential transmission line as branch lines. Compared with that of the uniform transmission line, the bandwidth of the proposed 3-dB branch-line directional cpoupler increases 2.96 times.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.518-522
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• 2014

This paper is concerned with the dynamic modeling of transmission line undergoing galloping vibrations. To this end, the kinetic and potential energies of a uniform wire vibrating in space are derived. The equations of motion suitable for numerical simulations are derived using the assumed mode method and Lagrange equation. The resulting equations of motion are expressed in matrix form. To cope with bundled transmission line, the spacer was modelled by a spring element. As a numerical example, a two-wire transmission line combined by spacers was considered. Natural vibration characteristics show that the in-plane vibrations of the transmission line appeared in low frequency range, which may lead to galloping.

• 전기학회논문지
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• 제57권4호
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• pp.576-581
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• 2008

Electricity Market in Korea can't provide locational price signal through energy price because energy market is CBP(Cost Based Pool) using uniform price. Generators don't want to locate in a densely populated load area(like the metropolitan area). Because they are paid more fixed cost in metropolitan area. This situation has loss and congestion occurred in power system. However energy market without price signal can't lead generator to the metropolitan. So, market participants should be provided price signal through the transmission price instead of energy price. This paper proposes transmission pricing method considering reliability cost in order to offer price signal. Also, it proposes the method to allocate the transmission cost to each transmission line user through a fair and a reasonable manner. The transmission price is decided by the reliability value of each line. If a transmission line of high reliability value is broke, users using that line will get a loss and a discomfort. So, it is fair that users using a transmission line of high reliability value pay more than the other users. Also, it is reasonable that a transmission line owner get paid more form users using that line.

• 한국항행학회논문지
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• 제21권3호
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• pp.287-293
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• 2017

본 논문은 균일한 임피던스를 갖는 출력 포트사이 전송선로의 전기적 길이를 다르게 함으로서 비대칭 Bagley 분배기 설계에 대한 내용을 서술하였다. 이 분배기는 입력 포트와 연결된 출력 포트의 전기적 길이만을 조정하여 출력 포트에 원하는 임의의 출력 비율을 얻을 수 있고, 모든 전송선로의 특성 임피던스는 균일한 것이 특징이다. 이러한 설계 방법을 사용하면 비대칭 출력을 얻을 수 있음에도 출력포트에는 임피던스 변환기를 사용하지 않는다. 이것을 증명하기 위해서 동작주파수 2 GHz에서 1:2:1 비율의 3차와 2:3:4:3:2 비율의 5차 비대칭 Bagley 분배기를 시뮬레이션과 제작하였다. 측정 결과는 시뮬레이션과 동일함을 확인하였다.

• 한국전자파학회논문지
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• 제21권7호
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• pp.734-743
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• 2010

본 논문은 다중 도체 전송선 해석법과 chain matrix 알고리즘을 이용하여 twisted cable과 같은 비균일 전송선의 EMP 결합을 해석하였다. 전송선의 EMP 결합 해석을 위해 BLT(Baum-Liu-Tesche) 해석법이 널리 사용되고 있으나, twisted cable과 같은 비균일 전송선에 기존의 BLT 해석법을 바로 적용하기는 어렵다. Twisted cable과 같은 비균일 전송선을 해석하기 위해 수많은 작은 길이의 균일 전송선으로 나누어 모델링하였으며, 전체 비균일 전송선의 결합 특성은 각각의 균일 전송선의 EMP 결합 분석을 통해 최종적인 전송선의 결합 특성을 구함으로 써 가능해진다. 이러한 비균일 전송선 EMP 결합 해석 기법을 검증하기 위해 균일 전송선에 대하여 기존의 BLT 해석 결과와 비교하였으며, 제시된 비균일 전송선 EMP 결합 해석 기법을 지표면 위에 놓여 있는 twisted cable에 적용하여 대기 중의 핵폭발에 의한 HEMP(High altitude Electromagnetic Pulse)와 같은 매우 강한 펄스가 입사되었을 때, 전송선에 연결된 부하에 유기되는 전류(또는 전압) 응답을 분석하였다.

• 전자공학회논문지D
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• 제34D권5호
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• pp.14-21
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• 1997

The crosstalk among three identical uniform coupled microstrip transmissiom lines is examined. To analyze the crosstalk, the simultaneous equations for the voltage and current waves on each transmission line are induced from the transmission line equation. The capacitance and the inductance of the line to solve the transmission line equation are calculated by the spectral domain analysis and the space domian analysis. There are three quasi-TEM modes is three microstrip transmission lines and the characteristics mode impedences in each mode are almost equal at a weak coupling state. The crosstalk among three identical microstrip transmission lines is calculated varying the frequency from 50MHz to 3GHz.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.271-271
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• 2012

Many studies have been investigated on high density plasma source (Electron Cyclotron Resonance, Inductively Coupled Plasma, Helicon plasma) for large area source after It is announced that productivity of plasma process depends on plasma density. In this presentation, we will propose the new concept of the multiple source, which consists of a parallel connection of ICP sources and helicon plasma sources. For plasma uniformity, equivalent power (especially, equivalent current in ICP & Helicon) should distribute on each source. We design power feeding line as coaxial transmission line with same length of ground line in each source for equivalent power distribution. And we confirm the equivalent power distribution with simulation and experimental result. Based on basic study, we develop the plasma source for oxidation in semiconductor process. we will discuss the relationship between the processing parameters (With or WithOut magnet, operating pressure, input power ). In ICP, plasma density uniformity is uniform. In ICP with magnet (or Helicon) plasma density is not uniform. As a result, new design (magnet arrangement and gas distributor and etc..) are needed for uniform plasma density in ICP with magnet and Helicon.

• Journal of Electrical Engineering and Technology
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• 제11권4호
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• pp.961-968
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• 2016

The non-uniform distribution of contamination on insulator surface has appreciable effects on flashover voltage, and corresponding researches are valuable for the better selection of outdoor insulation. In this paper, two typical types of porcelain and glass insulators which are widely used in ac lines were taken as the research subjects, and their corrections of AC flashover voltage under non-uniform pollution were studied. Besides, their flashover characteristics under different ratio (T/B) of top to bottom surface salt deposit density (SDD) were investigated, including the analysis of flashover voltage, surface pollution layer conductivity and critical leakage current. Test results gave the modified formulas for predicting flashover voltage of the two samples, which can be directly applied in the transmission line design. Also, the analysis delivered that, the basic reason why the flashover voltage increases with the decrease of T/B, is due to the decrease of equivalent surface conductivity of the whole surface and the decrease of critical leakage current. This research will be of certain value in providing references for outdoor insulation selection, as well as in proposing more information for revealing pollution flashover mechanism.