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레이더경보수신기용 CD대역 진폭비교 방향탐지 정확도 측정 시스템 개발
현예지,최남우,최혁재,조원택,김성훈 대한전자공학회 2022 전자공학회논문지 Vol.59 No.11
Radar Warning Receiver(RWR) is Electronic Warfare Support equipment, which detects and measures threat radar signal in high speed then provides real time warning. This paper describes the development of an amplitude comparison direction finding accuracy measuring system for CD band RWR, which is intended to be loaded on aircraft for the first time in Korea. The developed RWR equipment receives CD band signal from Blade Antenna, executes signal processing in RF and Digital module, and derives angle of arrival(AOA) using the amplitude comparison direction finding logic. Since CD band blade antenna has an unbalanced beam pattern, unlike EJ band or spiral antenna, this paper measures direction finding accuracy by adding a beam calibration algorithm. As a result of conducting a radiation test on the CD band in the anechoic chamber to verify the direction finding accuracy, the performance is confirmed that the average CD band direction finding accuracy is measured by 6.73% higher than the target performance of OO degree RMS in 360 degree azimuth and 45 degree elevation range.
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환경변이원 중금속 니켈에 의해 유발되는 분자독성기전에 대한 고찰
이상민,황승용,최남우,서영록 대한암예방학회 2009 Journal of cancer prevention Vol.14 No.4
Nickel (Ni) is a widely distributed industrial metal which can expose to human through polluted environments including nickel refining, electroplating, and welding industries. Ni exposure can cause a variety of pathological cellular effects through generation of reactive oxygen species (ROS), genotoxicity, inhibition of Ni-binding proteins, dysregulation of cell cycle control and apoptosis and DNA repair inhibition. Ni-induced ROS can lead to DNA damage, which can produce 8-oxo-dG, and triggers cell signaling pathways involve in cellular proliferation, apoptosis, and transformation. Furthermore, accumulation of nickel into the cells has negative impact on genetic materials, particularly on chromosome, resulting in chromosomal deletion, aberration, and regional decondensation. Nickel compounds also modulate gene expression including c-myc, proto-oncogene whose product play role in carcinogenesis. Recent studies have shown that many proteins with strong affinity to Ni are involved in nickel transport, detoxification and excretion. Moreover, binding ability of Ni to particular proteins crucial for cellular functioning raises the possibility to change in homeostasis. Of interest, inhibition of DNA repair by nickel compounds probably causes cell death and mutation. The present review will provide information on the molecular and cellular toxicity of heavy metal nickel as one of most concerning environmental carcinogens.
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소형화가 가능한 이중 도파관-동축 변환 구조를 갖는 12-way 방사형 결합기 설계 및 제작
이수현,강병주,문효상,최남우,양훈기 한국인터넷방송통신학회 2023 한국인터넷방송통신학회 논문지 Vol.23 No.6
A radial combiner with high efficiency characteristics in the X-band was designed and manufactured using a waveguide and matching structure. In particular, in order to manufacture it in a small size, a dual waveguide to coaxial transition structure was applied that allows two ports to be matched to one waveguide. Applying this structure makes it possible to manufacture smaller than typical coaxial to waveguide radial combiner. As a result of measurement in the X-band band of 9.2~10GHz, the return loss was less than -18.408dB and the output insertion loss was less than 0.206dB, and the output combining efficiency was obtained as high as 95.37% or more. It is expected that it can be used in the combining part for high output transmitters in the millimeter wave band in the future. In particular, the range of use is expected to increase by reducing the size and weight.
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실제 지형 환경과 지구 곡률이 반영된 재밍 유효거리 분석을 위한 M&S 기법
허준,문효상,김상수,최남우,박용배 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.2
Jammers are commonly employed in electronic warfare (EW) environments. A system that can respond according to the jamming signals emitted by jammers can be developed by predicting the affected radar detection range and burn through range. In this paper, we propose an M&S technique for calculating the received power by considering the actual terrain information and the curvature of the Earth, and analyze the burn through range with the specifications of the radar and jammer. The proposed M&S technique was applied by using the specifications of the experimented actual radar, and the burn through range was analyzed for targets with various radar cross sections. It was confirmed that the burn through range from the radar decreased as the radar cross section of the target decreased, and the effective isotropic radiated power of the jammer decreased.
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전후방비 개선 설계 기법을 이용한 ISM 대역 방향 탐지 안테나
이동근,박원빈,문효상,이창용,최남우,황금철 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.2
In this study, a direction-finding array antenna with an improved front-to-back ratio was developed by inserting meander slots into the ground plane of an electrically small antenna. The proposed ground slot structure improves direction-finding capabilities while maintaining the electrically compact structure of the antenna. The overall size of the antenna is 58 mm×58 mm×40 mm, with each array element measuring 40 mm×22 mm×1.6 mm. The antenna consists of eight elements attached to a vertical column, forming an octagonal structure that affords omnidirectional detection. The measured S11 bandwidth (≤−10 dB) is between 2.37 and 2.48 GHz. At 2.44 GHz, the maximum gain is −2.71 dBi, the 3-dB beamwidth occurs at an elevation angle of 74.2° and azimuth angle of 84.4°, and the front-to-back ratio is 8.89 dB.
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