• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2006년도 하계학술대회
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• pp.170-174
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• 2006

In this paper electromagnetic topology (EMT) is used to analyze the lumped components on printed circuit boards (PCBs). It is difficult to obtain desirable results about the electromagnetic coupling problems by using a numerical or an experimental method on complex systems. The EMT can be considered as a helpful method to the analysis of electromagnetic interference / electromagnetic compatibility (EMI/EMC) problems in the complex system. To verify the validity of this method, three types of the PCBs mounting a simple circuit are fabricated and experimented.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.213-218
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• 2003

Because of the development of digital technology, modern digital instrumentation & control systems are being innovativly developed in industrial plants. Whereas, many analog systems are still being used in nuclear plants, because of the demerits of digital equipment. As known, the demerits of digital equipment are the uncertainty and weaknesses in ambient environments such as smoke & electromagnetic interference In an Integral Reactor, a digital I&C system will be composed of microprocessor, memory and network card. Designers will apply new technique for digital equipment. Thus, it is important for digital I&C systems to operate according to designed functions & performance in the ambient environments during a life cycle. Digital I&C systems should have tolerance in such environments and environment qualification should be concluded To acquire electromagnetic interference qualification of digital equipment, this paper suggests an EMI test requirement. Designers should consider the electromagnetic compatibility and test digital equipment according to each test procedure. This paper involves an EMI test requirement and the results analysis of EUT(Equipment Under Test). Test result analysis will be used as electromagnetic compatibility design guides for Integral Reactor I&C systems.

• 한국인터넷방송통신학회논문지
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• 제20권2호
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• pp.117-122
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• 2020

본 논문에서는 두 대의 X-대역 안테나를 활용한 시험을 통해 복수의 레이다가 적용되는 함정 통합마스트용 다기능위상배열 레이다의 인접 안테나 개구면 간 전자파 간섭 영향성을 확인하였다. 두 안테나는 시험을 위해 설계 된 통합마스트를 모사한 치구에 배치하였으며, 본 형상을 모델링하여 안테나 빔 조향 시 전자파 영향성을 전자파 해석 도구를 활용하여 분석하였다. 또한, 시험적 분석을 위해 6 가지 시험 시나리오를 설정하였으며, 각 시험 시나리오는 무반향 챔버에서 진행하였다. 시험 시 안테나 #1은 펄스 파형 송신 하였으며, 안테나 #2 부터 수신된 신호는 수신장치를 통해 광 데이터로 저장하여 신호를 분석하였다. 분석 결과를 바탕으로 통합마스트에서 복수의 다기능 레이다를 인접하여 운용 시 전자파 간섭 영향성을 제시한다.

• 전기학회논문지
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• 제57권5호
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• pp.821-826
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• 2008

Recently as a progress of electric technology, modern electric systems become more and more complicated. Thus, it is difficult to use a classical method to analyze responses of the systems in complicated electromagnetic environments because there are so many coupling phenomena. The electromagnetic topology (EMT) is a helpful solution to analyze electromagnetic interference / electromagnetic compatibility (EMI/EMC) of the large complex system. In this paper, EMT is applied to analyze an active element. And then to prove the validity of this analysis, a detector circuit including Schottky barrier diode is analyzed by EMT when input power is given directly.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 C
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• pp.1425-1427
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• 1995

The effect of the magnetic flux interference between the driving and detecting unit of the gyroscope by the electromagnetic force has been investigated quantitatively. The key parameter dictating the output characteristics of the gyroscope which is driven and detected using electromagnetic force is the mutual interference between the driving and detecting unit. Using the specially designed apparatus for positioning of the detecting unit, it is found that the vertical positioning of the detecting unit plays a significant role in minimizing the interference effect as evidenced by our experimental results.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.718-723
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• 2005

The airport needs fast and reliable transporter to transfer goods from airport to other cities. In the past, a highway was a main transporter for those function of the airport but recently, electrical train becomes main part of transporter due to its high efficiency, convenience and advantage of auto-pilot. However electrical train produce electromagnetic field and many kinds of radio communication system are existing in the airport. So, some electromagnetic interference can be existed between the railway system installed nearby the airport and the radio-communication systems of the airport. Therefore, effects of electromagnetic interference between them need to be estimated by actual field test.

• Journal of electromagnetic engineering and science
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• 제9권3호
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• pp.141-145
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• 2009

Interference scenarios involving and a methodology for a terrestrial international mobile telecommunication(IMT) system and mobile-satellite service(MSS) system in a co-channel environment are established. Taking into account a practical deployment situation for both systems, a computational simulation of interference in terms of the ratio of interference power to thermal noise(I/N) is performed in order to evaluate the co-frequency interference with the IMT system caused by the MSS system. The methodology and results could be used for planning an IMT deployment without an unacceptable interference impact caused by the MSS system.

• Journal of electromagnetic engineering and science
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• 제18권4호
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• pp.254-260
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• 2018

In this study, we suggest an emulator for generating multiple heterogeneous interference signals in the Korean radio frequency identification/ubiquitous sensor network (RFID/USN) frequency band. The proposed emulator uses only one universal software radio peripheral to generate multiple heterogeneous interference signals more economically. Moreover, the physical and media access control parameters can be adjusted in real time using the LabVIEW program, thereby making it possible to create various time-varying interference environments easily. As an example showing the capability of the proposed emulator, multiple interference signals consisting of a frequency-hopping RFID signal and two LoRa signals with different spreading factors were generated. The generated signals were confirmed in both frequency and time domains. From the experimental results, we verified that our emulator could successfully generate multiple heterogeneous interference signals with different frequency and time domain characteristics.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 춘계학술대회 논문집
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• pp.807-808
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• 2009

• 한국전자파학회논문지
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• 제27권10호
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• pp.945-948
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• 2016

최근 프리미엄급 스마트폰들은 대부분 메탈 프레임을 채용하고 있으며, 이는 중저가 스마트폰으로 확산되고 있는 추세이다. 하지만, 메탈 프레임은 스마트폰 내 디지털 부품에서 발생하는 전자파 노이즈의 좋은 전달 경로가 되어, 스마트폰 상단부 또는 하단부에 위치한 무선 안테나에 전자파 간섭을 일으키는 원인이 될 수 있다. 본 논문에서는 메탈 프레임에 EBG(Electromagnetic Band Gap) 구조를 적용하여 안테나로의 전자파 간섭을 줄일 수 있는 방법을 제안하였다. $7{\times}6$ 배열의 다중 비아(Multi-via) EBG 구조를 갖는 메탈 프레임을 설계하였으며, 이를 적용할 경우, 메탈 프레임을 통한 표면 전자파 노이즈 간섭을 20 dB 정도 저감시킬 수 있음을 시뮬레이션을 통해 확인하였다.