• Title/Summary/Keyword: EMP protection

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Design of a Planar Log-Spiral Antenna for Testing Plane-Wave Shielding Effectiveness (평면파 차폐효과 시험용 평판형 로그 스파이럴 안테나 설계)

  • Chung, Yeon-Choon
    • 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.

Analysis of Radiation Shielding Effect of Soft Magnetic Material applied to Military Facility (경량 연자성 소재의 군 시설물 적용 시 방사선 차폐효과 분석)

  • Lee, Sangkyu;Lee, Sangmin;Choi, Gyoungjun;Lee, Byounghwak
    • Journal of the Korean Society of Radiology
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    • v.15 no.2
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    • pp.191-199
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    • 2021
  • The purpose of this research is to analyze the radiation shielding effect of soft magnetic material to confirm the applicability to the military facilities. The soft magnetic material is known to be effective in shielding EMP. If this material is also effective in radiation shielding, it is expected that it has a lot of applicability in military protection. In particular, this material contains boron, so it will be effective in shielding neutrons. In this research, experiments were conducted using Cs-137 and Co-60 sources to check the gamma ray shielding effect. In addition, the Monte Carlo N-Particle(MCNP) modeling was applied to evaluate the gamma ray and neutron shielding effect of a military command tent. As a result, as the soft magnetic thickness increased, the shielding performance improved according the linear attenuation law of gamma ray and neutron. Therefore, this research verified that the application of soft magnetic material for military purposes in radiation shielding would be effective.

A Development of the Optimized Shielding Room Design Simulator for HEMP Protection (HEMP 방호용 차폐실 최적설계를 위한 시뮬레이터 개발)

  • Min, Gyung-Chan;Kim, Dong-Il
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.4
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    • pp.121-126
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    • 2010
  • Regarding HEMP has been studied as few thousand of paper by major nuclear bomb holding countries with USA for the self protection against nuclear bomb attract. Major HEMP protection facilities are consist of the shielding, filtering, grounding and high voltage protection circuits. Shielding room construction required a highest cost among the key protective facilities. Most of a theoretical formulas listed on the paper and related books has a little correlations in the certain frequency band between the theoretical formulas and field measuring results. For the reasons we proposed the advanced new theoretical formulas and developed the computer simulation S/W as enough as apply to the cost effective shielding room design for HEMP considering the various structural constants.

An Experimental Study on the Measurement of Electrical Conductivity of Cementitious Composites According to the Type of Steel Fiber (강섬유 종류에 따른 시멘트 복합체의 전기전도도 측정에 대한 실험적 연구)

  • Lee, Yae-Chan;Kim, Gyu-Yong;Nam, Jeong-Soo;Lee, Sang-Kyu;Shu, Dong-Kyun;Eu, Ha-Min
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.06a
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    • pp.191-192
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    • 2020
  • The purpose of this study is to measure the electrical conductivity of cementitious composites as an early step to obtain shielding performance by mixing various type of steel fiber into cementitious composites, the main building material of protection facility, to shield electromagnetic pulse (EMP) damage. Fiber such as conductors as amorphous metallic fiber, hooked steel fiber, and smooth steel fiber are mixed into cementitious composites to give electrical conductivity and measure the impedance of concrete using LCR meter. By doing this, the electrical conductivity of each type of steel fiber reinforced cementitious composites (FRCC) is compared.

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A Study on Risk Assessments and Protection Improvement for Electric Power Infrastructures against High-altitude Electromagnetic Pulse (전력기반시설의 고 고도 핵 전자기파에 대한 위험성 검토 및 방호 개선방안 연구)

  • Chung, Yeon-Choon
    • 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.

Implementation of Dedicated Power Line Filter for HEMP Protection (HEMP 보호용 전원선 필터 구현)

  • Kim, Keun-Nam;Lee, Sung-Hwa;Kim, Jin-Tae
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.16 no.4
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    • pp.47-52
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    • 2016
  • This paper covers the importance of a dedicated Power Line Filter implementation against HEMP(High altitude ElectroMagnetic Pulse) threats caused by high altitude nuclear detonations. As the PCI test results for E1 short pulse with 2500[A], only HEMP filter obtained the required residual current around 8[A], but others didn't meet below 10[A] on MIL-STD-188-125 PCI regulation. Consequently, the development of a dedicated power line filter turned out to be a essential element in order to protect the power related system against HEMP transient.

Analysis of Low-Frequency Magnetic SE of a Metal Plate: Diffusion and Slot Effects (도체 판의 자기장 차폐효과 분석: 확산과 슬롯 효과)

  • Park, Hyun Ho;Kwon, Jong Hwa
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.30 no.4
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    • pp.324-327
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    • 2019
  • This study analyzes the low-frequency magnetic shielding effectiveness (SE) of a metal plate, in terms of diffusion and slot effects, by conducting a numerical simulation and implementing an analytical solution. When the metal has a low conductivity, the SE is dominated by the diffusion effect. However, when the conductivity and frequency both increase, the slot has a major influence on the SE. These results can be used as guidelines in the shielding design and SE requirements of electromagnetic pulse protection facilities.