• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.25 no.3
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• pp.58-65
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• 2014

• Review of KIISC
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• v.29 no.6
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• pp.49-52
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• 2019

원자력시설 등의 방호 및 방사능 방재 대책법에 따라 2018년 개정된 설계기준위협(DBT)은 전자적 침해행위 중 하나로 의도적 전자기파 간섭(IEMI) 위협을 반영하였으며, 이에 따라 원자력시설은 IEMI 위협에 대한 물리적방호시책을 마련하여야 한다. 한국원자력통제기술원(KINAC)은 개정 설계기준위협에 따라 2018년 원자력시설의 고출력 전자기파 방호 심·검사 기준(KINAC/RS-020)을 개정하여 원자력시설의 IEMI 위협에 대한 취약성 평가 방법론을 제시하고 있다. 본 논문은 KINAC/RS-020에 따른 원자력시설 IEMI 위협 취약성 평가를 위해 개발 중인 IEMI 위협에 대한 시나리오 평가 방법론에 대해 소개한다.

• Convergence Security Journal
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• v.19 no.3
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• pp.43-50
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• 2019

In a hyper-connected society, electric power infrastructures and information and communication infrastructures are the core of critical national infrastructures. However, electric power infrastructure is very deadly to high-frequency nuclear electromagnetic pulse (HEMP) threats recently issued by North Korea, so the resilience through rapid recovery after attack is directly related to the survivability of our country. Therefore, electric power infrastructure should take precedence over any other key infrastructure, with preemptive protection measures and fast recovery plans. In this paper, the characteristics of the HEMP threats was examined, and the risks and effective major protection measures of the electric power infrastructures are discussed. In the future, it is expected that it will be able to help establish the direction of enactment and revision of legal schems related to the 'high power EMP infringement prevention' for Korea's electric power infrastructures.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.9
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• pp.947-956
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• 2008

In this paper, miniaturized conically stepped COBRA is proposed. In order to prevent electrical breakdown, COBRA, which consists of hem and lens, has to get bigger if it is designed with conventional method. Because of the phase error increase, shortening the length of the antenna without changing the aperture size leads to the reduction of the antenna gain. To avoid this, the phase error at the aperture is compensated by transforming the COBRA lens into conically stepped form. The simulations result shows that the proposed antenna has higher gain than the conventional COBRA in spite of the size reduction from 1,300 mm to 600 mm. The fabricated and measured COBRA has the gain of 26.2 dBi.

• Journal of IKEEE
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• v.23 no.3
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• pp.762-767
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• 2019

The plane-wave shielding effectiveness is typically measured for horizontal and vertical polarizations using a linearly polarized antenna. However, this typical measurement method results in big evaluation fees due to very long measurement time as well as huge idle space for maintenance, these problems is more severe especially in large shielded enclosures such as EMP protection facilities to be built in indoor buildings and underground. This paper describes the design and fabrication process and results of a planar log-spiral antenna applicable to the evaluation of the electromagnetic shielding effectiveness of a large EMP protection facility. Since the proposed antenna has a circular polarization, there is no need to separately measure the horizontal and vertical polarizations. Therefore, the measurement time can be shortened by more than 1/2, and further, its small volume with a planar structure can reduce greatly idle space required for the maintenance.

• Proceedings of the Korean Vacuum Society Conference
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• 1999.07a
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• pp.242-242
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• 1999

상대론적 전자빔 발생장치(300kV, 40kA, 60ns)를 통하여 발생하는 전자빔은 진공 중에서 공간전하한계전류값을 갖게 되어 진행이 어렵다. 이런 전자빔의 전파특성을 향상시키기 위하여 여러 가지 방법들이 실험되어졌다. 본 실험실에서 수행한 실험은 전자빔의 진행해나가는 도파관 속에 국부적인 plasma channel을 형성시키고 이에 따른 전자빔의 전파율의 향상을 유도하였다. 이때 형성되는 높은 에너지의 이온빔을 관찰하고 이온 전류밀도에 따른 전자빔의 수송효율사이의 관계를 관찰하였다. 전류밀도의 증가는 여러 가지로 응용 될 수 있다. 자유전자레이저(Free Electron Laser)는 microwave로부터 가시광선 영역을 포함해 X-ray 영역까지의 coherent radiation을 발생시킬 수 있는 개념의 장치이다. 이 장치에서 전자빔의 전류밀도는 출력되는 전자기파의 power와 직접적으로 관계하여 고출력 microwave 발생장치를 구성할 수 있다. 이번 실험에서는 일정한 국부적으로 형성된 plasma에 따른 강렬한 상대론적 전자빔의 전파효율의 향상을 관찰하였다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.2
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• pp.155-158
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• 2017

With the help of technical development in the electronic industries, the electronic devices employing the cutting-edged technology are spread in all the area requiring electromagnetic communications. Especially, because of the presence of electronic devices in a variety of research fields like automotive vehicle, train, and aircraft, the research area such as the malfunction and critical damage of the internal system and microwave devices due to the unexpected radiated high-powered EM effects are very important even for the possible occurrence of human damage. In this paper, the effects of electromagnetic fields into the cable connecting the electronic devices and many sensors inside the target structure is treated because of potential malfunction or hardware disorders. In addition, correlation function and transmission line theory have been employed for the analysis of the induced current on the cable inside an electrically large resonant structure.

• Review of KIISC
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• v.28 no.6
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• pp.88-95
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• 2018

방사능방재법의 개정을 통해 전자적 침해행위의 유형으로 고출력 전자기파(Electromagnetic Pulse, 이하 EMP) 위협에 대한 대책이 원자력시설별로 마련되도록 요구되었다. 그동안 국내의 EMP 위협에 대한 방호 대책은 군사시설 중심으로 오랫동안 연구되고 적용된 바 있으나, 공공 및 민간시설에 대해서는 이제 막 첫발을 내딛은 상황이다. 본고에서는 한국원자력통제기술원 사이버보안실에서 추진하고 있는 국내 원자력시설에 대한 EMP 방호 규제체계 구축현황에 대해 소개하고, 이에 배경이 되는 법적 근거 및 국내 외 유관 연구사례 및 기술표준 등에 대해 살펴보고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.6 no.1
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• pp.94-103
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• 2005

The low foamed high strengthen styrofoam samples made by dielectric heating are discussed. We used the oscillator which have the frequency of 13.6 MHz and the power of 7 kW. 3 times expanded beads by steaming method were used in our foam-molding test. Internal fusion properties and density of internal structure were improved by dielectric foaming process. At the temperature of $105-110^{\circ}C$, the internal fusion property was maximally improved.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.12
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• pp.2263-2268
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• 2008

We investigated the malfunction and destruction characteristics of microcontroller devices under high power electromagnetic(HPEM) wave by magnetron. HPEM was rated at a microwave output of 0 to 1,000 W, at a frequency of 2,450${\pm}$50 MHz and was radiated from the open-ended standard rectangular waveguide(WR-340) to free space. The influence of different reset-, clock-, data-, and power supply-line lengths has been tested. The variation of the line length was done with flat cables. The susceptibility of the tested microcontroller devices was in general much influenced by clock-, reset-, and power supply-line length, little influenced by data-line length. Further the line length was increased, the malfunction threshold was decreased as expected, because more energy couples to the devices. The surfaces of the destroyed microcontroller devices were removed and the chip conditions were investigated with microscope. The microscopic analysis of the damaged devices showed component and bondwire destructions such as breakthroughs and melting due to thermal effects. The obtained results are expected to provide fundamental data for interpreting the combined mechanism of microcontroller devices in an intentional microwave environment.