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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.
객체 코너의 재배열된 특성요소의 최대 열에 의한 영상 정보 검색
강광원(Gwang-won Kang),이지민(Ji-min Lee),박종안(Jong-an Park) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.12
본 연구에서는 객체 코너의 재배열된 특성요소의 최대 열에 기반하는 비주얼 정보검색 기법을 제안한다. 제안된 알고리즘은 다음 단계로 진행된다. 먼저 영상 내 객체의 코너 점을 추출하여, 이를 크기순에 따라 순환적으로 재배열하여 특성벡터를 형성한다. 그리고 재배열된 특성벡터에 따라 얻게 되는 최대 열벡터를 기반으로 유사도를 측정하게 된다. 제안된 기법은 영상 내에서 형태 구조가 분명한 객체의 실험에서 성능이 우수하였으고, 객체의 이동이나 회전에도 강인하였으며 코너 패치 히스토그램을 이용한 형태 검색에 비해 약 0.05%의 향상된 recall을 나타내었다. This paper have proposed an algorithm for retrieving a visual information based on rearranged feature vectors of the object corner. The proposed algorithm is processed as follows. First, the corner points of the object in an image are extracted and then the feature vectors are obtained. It are rearranged according to the number dimension and consist of sequence vectors. And the similarity based on the maximum of sequence vectors is measured. The proposed technique is invariant to the rotation or the transfer of the objects and more efficient in case that the objects present simple structure. In simulation that use Wang's database, the method presents that the recall property is improved by 0.05% and more than the standard corner patch histogram.