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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.
강광원(Kwang Won Kang),최인선(In Seon Choi),박석채(Seog Chea Park),임호(Ho Lim),장안수(An Soo Jang) 대한천식알레르기학회 1999 천식 및 알레르기 Vol.19 No.2
Background: Blunted perception of dyspnea, which may be related to the increased mortality, has been demonstrated in patients with a history of near-fatal asthma and in the elderly. Objective: The purpose of this study was to evaluate the relationship between the perception of dyspnea and the severity of asthma. Methods: Baseline spirometry and Borg score change(A Borg score) during breathing through an inspiratory muscle trainer were measured in 27 consecutive asthma patients and 11 normal subjects. Results: The baseline Borg score was negatively related to FEV1 A Borg score was significantly lower in asthmatics than in controls at high level of loads. A Borg score was lower in severe asthma than in mild asthma. A Borg score was positively related to the baseline FEV1. Seventy-five percent of severe asthma, 62.5% of moderate one, and 9.1% of mild one showed impaired dyspnea perception. Dyspnea perception was related to age(r, = -0.49, p<0.001). Conclusion: Three quarters of patients with severe asthma showed impaired dyspnea perception to inspiratory resistive load. Dyspnea perception was related to asthma severity and age.