• 한국전자파학회지:전자파기술
• /
• 제2권2호
• /
• pp.25-29
• /
• 1991

본 논문에서는 전자기파의 기본 차폐식을 이용하여 금속인 모재에 얇은 두께의 박판으로 접합되어 있는 경우의 차례이론식을 유도하여, 대표적인 금속 평판 쉴드로 비자성 재료인 Aluminium과 Steel에 전도성도료를 칠했을 경우에 평면파에 대한 차폐 효과를 조사하였다.

• 한국의류산업학회지
• /
• 제21권5호
• /
• pp.618-626
• /
• 2019

This study conducted basic studies to develop electromagnetic wave shielding maternity wear. We investigated electromagnetic wave shielding fabrics and products as well as surveyed actual wearing states for pregnant women aged 35 to 44 and women who gave birth within the past one year. Available electromagnetic wave blocking products for pregnant women were blankets, aprons, maternity belts, and underwear. These only cover the abdomen and it was hard to find out electromagnetic waves shielding maternity wear, which can enhance functionality and complement the body shapes of pregnant women. The aged mother responded pregnancy delay was mostly attributable to late marriage, career, financial difficulty and health problems. Major health threats to babies were high stress levels during pregnancy, followed by electromagnetic waves from electronic devices. They prioritized physical activity, design, functionality and safety when wearing maternity wear. When purchasing maternity wear, they emphasized design, price, materials and size. The most preferred clothing was one-piece dress; consequently, only 11.1% of them were satisfied with the quality of maternity wear with complaints mostly about design and price. A total of 63% of respondents tried to protect themselves from electromagnetic waves. Most aged mothers showed a positive intention on purchasing electromagnetic waves blocking maternity wear for babies with concerns dealing with safety of materials, prices, ease of laundry, and body complementing design.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2005년도 춘계학술대회 논문집
• /
• pp.1322-1325
• /
• 2005

The main objectives of this research work are to develop conductive glass fiber woven roving and carbon fiber unidirectional fabric composite materials and to determine their electromagnetic shielding effectiveness(EMSE). Epoxy is the matrix phase and glass, carbon fiber are the reinforcement phase of the composite material. Carbon black are incorporated as conductive fillers to provide the electromagnetic shielding properties of the composite material. The amount of carbon black in the composite material is varied by changing the carbon black composition, woven roving and unidirectional (fabric) structure. The EMSE of various fabric composites is measured in the frequency range from 300MHz to 800MHz. The variations of EMSE of woven roving and unidirectional composites with fabric structure, metal powder composite are described. Suitability of conductive fabric composites for electromagnetic shielding applications is also discussed.

• 콘크리트학회논문집
• /
• 제29권2호
• /
• pp.169-177
• /
• 2017

북한은 최근 핵무기의 일반적인 열, 폭풍, 방사능 피해가 아닌 전자 장비를 무력화시키기 위한 고고도 전자기파 탄을 개발 중인 것으로 예측되고 있다. 현재 군용 목적으로 사용되고 있는 HEMP 차폐 시설 중 차폐 판의 경우 전자파 차폐 효과가 뛰어난 금속 판이 사용되고 있으나 이러한 금속판들은 차폐 시설 제작 시 용접 부위에서의 전자파 유입 가능성 등 시공상의 어려움과 높은 비용이 문제시 되고 있는 실정이다. 이에 본 연구에서 차폐 시설을 따로 구축하지 않고 콘크리트 구조물 자체로써 전자파 차폐 효과를 확보하기 위하여 콘크리트 실험체에 전기전도성이 높은 재료를 혼입하였다. 또한, 실험체 중 가장 높은 차폐효과를 보인 2가지 수준과, 가장 낮은 차폐 효과를 보인 2가지 수준에 $100{\mu}m$ 아연-알루미늄 합금 금속용사 피막을 적용하였다. 실험 결과 전기전도성이 높은 재료를 혼입한 실험체는 MIL-STD-118-125-1 규격 최소 차폐 기준을 만족하지 못하였으나, 금속용사 피막을 적용한 실험체에서는 모두 최소 차폐 기준을 만족하였다. 결론적으로, $100{\mu}m$ 아연-알루미늄 합금 금속용사 피막이 HEMP 차폐에 높은 효율성을 가지고 있다고 판단된다.

• 한국전자파학회지:전자파기술
• /
• 제5권1호
• /
• pp.31-39
• /
• 1994

다양한 복합재료의 평면 전자파 차폐효과를 플랜지형 동축선 측정치구를 사용하여 평가하였다. 이들 측정결과로부커 제품의 외장재로 사용할 다양한 차폐재료의 선택 우선순의를 결정할 수 있다. 전자파차폐기능 복합재료의 차페 성능은 재료에 포함된 급속분말이나 급속섬유의 종류와 함량에 크게 의존한며, 최적 함량의 결정과 최적 첨가재의 선택이 매우 중요함을 알았다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2016년도 춘계 학술논문 발표대회
• /
• pp.41-42
• /
• 2016

In this study, the basic properties of concrete with entrained materials as shielding material for electromagnetic pulse(EMP) within 10kHz~1GHz were investigated. The concretes of moderate strength were prepared with different entrained materials. The shielding effectiveness will be determined according to MIL-STD-188-125-1 at 28 days of concrete curing. The results of physical properties were all satisfied of setting criteria.

• 한국정보전자통신기술학회논문지
• /
• 제5권4호
• /
• pp.175-179
• /
• 2012

본 연구에서는 콘크리트로 제조된 블록이나 타일의 형상을 변형하여 이동통신 및 ETC 주파수 대역에서 우수한 전자파 차폐 성능을 최대화할 수 있는 방안을 제안하였다. 측정 결과, 최적 설계된 블록의 형상은 약 30 dB의 차폐 성능을 나타내어 전자파 인체 안전성이나 전자파 간섭 문제의 대책 제품으로 사용 가능할 것이다.

• 한국분말재료학회지
• /
• 제31권1호
• /
• pp.57-76
• /
• 2024

Recent advancements in electronic devices and wireless communication technologies, particularly the rise of 5G, have raised concerns about the escalating electromagnetic pollution and its potential adverse impacts on human health and electronics. As a result, the demand for effective electromagnetic interference (EMI) shielding materials has grown significantly. Traditional materials face limitations in providing optimal solutions owing to inadequacy and low performance due to small thickness. MXene-based composite materials have emerged as promising candidates in this context owing to their exceptional electrical properties, high conductivity, and superior EMI shielding efficiency across a broad frequency range. This review examines the recent developments and advantages of MXene-based composite materials in EMI shielding applications, emphasizing their potential to address the challenges posed by electromagnetic pollution and to foster advancements in modern electronics systems and vital technologies.

• 한국분말재료학회지
• /
• 제21권2호
• /
• pp.124-130
• /
• 2014

The automotive industry is moving from the internal combustion engine to electric drive motors. Electric motors uses a high voltage system requiring the development of resources and components to shield the system. Therefore, in this study, we analyze electromagnetic interference (EMI) shielding effectiveness (SE) characteristics of an auto crash pad according to the ratio of electrically conductive materials and propylene. In order to combine good mechanical characteristics and electromagnetic shielding of the automotive crash pad, metal-coated glass fiber (MGF) manufacturing methods are introduced and compared with powder-type methods. Through this study, among MGF methods, we suggest that the chopping method is the most effective shielding method.

• 한국전자파학회:학술대회논문집
• /
• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
• /
• pp.47-53
• /
• 2003

Screen filter of PDP TV plays an important role in satisfying the EMI/EMC specifications. Two types of filters, the mesh type and the sputter type, are used in PDP TVs, and this paper presents measurement results of the shielding effectiveness (SE) in the frequency range from 50MHz to 1GHz. Two methods were used for the measurement, one using network analyzer (NA) in an open area test site(OATS), and the other using the screen room. The overall conclusion is that the shielding effectiveness of the screen filter is related to the surface resistance of the screen filter. The mesh type screen filters are superior to the sputter types in the shielding effectiveness, which is varying with the frequency.