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이중구조형 z-슬롯 안테나의 슬롯 형상에 따른 방사패턴 분석
강광원(Gwang-Won Kang),박종안(Jong-An Park),강성관(Sung-Kwan Kang),천종훈(Jong-Hun Chun),안영은(Young-Eun An) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.9
In this paper, the dual-structure z-slot antenna with radiation pattern according to the shape of slot for UHF RFID Reader was analyzed. In order to analyze characteristics of the dual-structure z-slot antenna, the 12 slots on the radiation plate were shaped under different parameter conditions with diagonal length (L), line length (d), the slot gap (t). The designed antenna and the standard antenna were rotated in the horizontal and vertical directions respectively and then the isotropic pattern was measured by 48 kinds of experimental methods and we have obtained the antenna prameter with optimal isotropic pattern characteristics. It was showed to improve the efficiency of the antenna, as well as to improve the miniaturization of antenna size and the receive sensitivity as a range of the tag through characterization analysis of the dual-structure z-slot antenna for UHF RFID Reader with optimal isotropic pattern.
RGB 칼라 특징정보와 Median 필터링을 이용한 영상검색
강광원(Gwang-Won Kang),박종안(Jong-An Park) 한국정보기술학회 2007 한국정보기술학회논문지 Vol.5 No.2
This paper presents an image retrieval technique that use RGB color feature information and median filtering to design a more effective algorithm that extracting features of color images for content-based image retrieval. First, extract middle value that use median filtering after segmentation color image into block of regular size. Extraction middle value presents an image retrieval technique using feature after color information do index using difference value and quantization by size order of R, G, B. Compose and use in small feature table by color image feature in this paper that see because need a large amount of storage space and many calculations according to used number of feature at algorithm of effective extract feature. Goodness of fit and order was obtained by comparing of features that were organized into a table, using the proposed algorithm, for the input image and database images. Confirmed that is superior comparing of features that were into a feature table by algorithm that propose and compare input image and DB image and yield fitness and order.