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능동빔패턴측정장치 및 드론을 활용한 초단파레이다 안테나 빔패턴 측정에 대한 연구
김기중,이성제,장윤희 한국전자통신학회 2019 한국전자통신학회 논문지 Vol.14 No.6
본 연구는 초단파레이다의 배열안테나에 대해서 드론 및 능동빔패턴측정장치를 활용하여 안테나 빔패턴 측정에 대해서 기술하였다. 안테나 크기가 큰 안테나의 원전계 특성을 만족하기 위해서는 챔버의 크기도 커야되기 때문에 국내에는 측정 가능한 챔버가 없는 상황이다. 본 연구는 초단파레이다를 개발하고 안테나 빔패턴 특성을 시험하기 위하여 드론에 능동빔패턴측정장치 및 수신안테나를 장착하여 안테나 빔패턴 특성을 시험하였다. This study describes the technique of the beam pattern measurement of array antenna for VHF band radar using drone and active beam pattern measuring device. There is no anechoic chamber for measuring the beam pattern of a large size antenna in the country. In this study, to test the antenna beam pattern characteristics of the developed VHF band radar, the antenna beam pattern characteristics were tested by Drone mounting an Active Beam Pattern Measuring Device. By comparing the results of the pre-simulation analysis with the measured results for the antenna, we could confirm that the beamwidth and side-lobe characteristics are satisfactory. Through the antenna beam pattern measurement technology using Drone and Active Beam Pattern Measuring Device, the beam pattern measurement technology of array antenna of low frequency band and large antenna for low band radar will be used.
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김기중,이창효 서울연구원 2019 서울도시연구 Vol.20 No.2
이 연구의 목적은 건물용도별 단위면적당 냉방에너지소비량 차이와 영향요인의 차이를 실증 분석하는 것이다. 연구의 공간적인 범위는 서울시내 필지 65,729개이며, 시간적 범위는 2015년 8월로 설정하였다. 크리스칼-왈리스 검증을 이용하여 건물용도별 냉방에너지 소비량 차이를 분석하고, 감마회귀분석을 활용해 건물용도별 냉방에너지 소비량 영향력 차이를 분석하였다. 분석 결과, 공동주택과 근린생활시설, 판매업무시설의 냉방에너지소비량은 통계적으로 차이가 있는 것으로 밝혀졌다. 건물에너지 소비 영향요인 측면에서 볼 때, 모든 건물용도에서 공시지가는 냉방에너지 소비를 늘리는 요인으로 분석됐다. 공동주택의 냉방에너지는 주변환경 특성보다 물리적 요인에 영향을 크게 받는 반면, 근린생활시설의 냉방에너지는 물리적 요인보다 주변환경 특성의 영향을 많이 받았다. The purpose of this study is to analyze the difference of cooling energy consumption according to building use. The spatial scope of the study was 65,729 parcels in Seoul, and the time range was August 2015. We analyzed the difference of cooling energy consumption by building use by using Kruskal-Wallis test. Furthermore, this study found the difference in factors affecting cooling energy consumption by building use using gamma regression. As a result of analysis, cooling energy consumption of apartment, neighborhood facility, and sales/work facility is statistically different. Regarding influencing factors of building energy consumption, the factor that increases the cooling energy consumption for all buildings is the land price. The cooling energy of the apartment is more affected by the physical factors than the characteristics of the surrounding environment. In contrast, cooling energy of neighborhood facilities is more influenced by environmental characteristics than physical factors.
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정지궤도위성용 L대역변환반의 PCB EM 해석을 통한 최적화
김기중,고현석 한국전자통신학회 2013 한국전자통신학회 논문지 Vol.8 No.8
This study is the analysis and verification process of the L-band satellite communications repeater thought PCB & circuit EM analysis. System performance can be vulnerable to various spurious inside the L-band satellite transponder, power conversion board,digital signal board, TM/TC board, such as control panels and blocks that are linked signal components when the winch is increased due to the noise component. So the whole system can cause performance degradation. PCB resonance analysis and EM simulation can be easily analyzed for a variety of optimal. Also, by setting the ports on the PCB, H/W designer wants to can easily analyze system. 본 연구는 위성통신 중계기의 L대역변환반의 PCB EM 분석을 하고, 불요파에 대한 취약 부분에 대해 최적화하였다. 위성중계기 안에는 L대역변환반 뿐만 아니라 전원반, 디지털신호처리반, TM/TC 제어반 등 다양한 기능 및 블록이 연동될 때 윈치 않는 신호 성분으로 인해 잡음성분이 증가되어 전체 시스템 성능 저하를야기 시킬 수 있다. EM 시뮬레이션 툴을 사용한 PCB 공진해석은 보드 상에서 공진에 취약할 수 있는 부분에 대해 쉽게 분석을 할 수 있고, 다양한 시뮬레이션을 통해 최적의 설계를 할 수 있다. 또한 PCB에 포트를설정하여 원하는 블록을 쉽게 분석할 수 있는 장점이 있다.
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RST Invariant Digital Watermarking Based on Image Representation by Wedges and Rings
김기중 한국콘텐츠학회 2009 International Journal of Contents Vol.5 No.2
This paper describes a new image watermarking scheme invariant to rotation, scaling and translation (RST) attacks. For obtaining the invariance properties we propose to present an image of watermark by wedges and rings to convert its rotation to shift and then utilize the shift invariance property of the Direct Fourier Transform (DFT). But in contrast to conversional schemes based on the Fourier-Mellin transform (FMT), we do not use a log-polar mapping (LPM). As a result, our scheme preserves high quality of original image since it is not underwent to LPM. For withstanding against JPEG compression, noise addition and low-pass (LP) filtering attacks a low frequency watermark is embedded into middle frequencies of the original image. Experiments with various attacks show the robustness of the proposed scheme.
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A New Video Watermarking Scheme Resistant to Collusion and Synchronization Attacks
김기중 한국콘텐츠학회 2009 International Journal of Contents Vol.5 No.2
A new video watermarking scheme with robustness against collusion and synchronization attacks is presented. We propose to embed only a few copies of the watermark along the temporal axis into frames, which are located at the borders of each two different plotlines of the video. As a result, each change of the video plotline is transformed into pulse, which is used for watermark embedding and extraction. In addition, since we embed a watermark only into a small number of frames, the distortions of the video are reduced to minimum. Experimental results show the robustness of the proposed scheme.
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김기중 한국문학이론과비평학회 2009 한국문학이론과 비평 Vol.45 No.-
The aim of this study is focused on the figuring out postmodern trend in recent Korean fantasy picturebooks. To figure out postmodern trend in recent Korean fantasy picturebooks, This paper examines existing condition of blurring boundaries between reality and fantasy first. Secondly, this study considers how parody picturebooks are crushing stereotypes. Lastly, this essay observes aspects of rise of subversive fantasy through irony in recent Korean fantasy picturebooks, Among our recent fantasy picturebooks, ' While We Were Out', 'Lots of Monsters at Home', 'I Want to Be a Bird' show blurring boundaries between reality and fantasy. The reason of this trend is postmodern thought which does not believe in possibility of absolutely objective fact and clear cut distinction between reality and fantasy. Postmodern parody can give us new perspectives through distorting original works. We can verify this kind of parody appearing in 'Ket-ji', 'Silk Skirt', 'Hide out!', 'Princess Putting on Boot' Irony comes from discrepancy between appearance and substance, word and meaning, presupposition and result. Irony is used in modernism as well as postmodernism. In modernsm irony is used to combine conflicting experiences. But postmodern irony stress the complexity and diversity of human experience. 'Myong-ae and Da-rae', 'Zoo', 'Old Man Mang-tae is coming' are picturebooks which shows postmodern ironies In conclusion, recent growth of Korean fantasy picturebooks benefits lots from postmodernism.
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