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정인성,김재수 대한소화기내시경학회 2011 Clinical Endoscopy Vol.42 No.6
We experienced a case of an 18-year-old woman who ingested salt-fermented northern sand lance and developed corrosive gastritis. The patient underwent a esophagogastroscopy and had developed a deep ulceration in the antrum. This cases shows that salt-fermented northern sand lance, which is very acidic and includes various biogenic amines, has the possibility of inducing a corrosive injury to the stomach. 18세 여자가 과량의 까나리액젓을 마시고 심와부 통증 및 오심을 주소로 내원하여 시행한 위내시경에서 위의 전정부에 국한된 깊은 궤양을 보이는 부식성 위염의 소견을 보였다. 발효식품인 까나리액젓은 산성의 성질을 가지면서 다양한 생체아민을 포함하고 있는 데 품질의 규격화가 되어있지 않아 주의를 요한다. 생체아민의 작용과 산성부식제의 영향에 관한 증례로 문헌 고찰과 함께 보고한다.
An approach for improving the performance of the Content-Based Image Retrieval (CBIR)
정인성 한국측량학회 2012 한국측량학회지 Vol.30 No.6
Amid rapidly increasing imagery inputs and their volume in a remote sensing imagery database, Content-Based Image Retrieval (CBIR) is an effective tool to search for an image feature or image content of interest a user wants to retrieve. It seeks to capture salient features from a ‘query’ image, and then to locate other instances of image region having similar features elsewhere in the image database. For a CBIR approach that uses texture as a primary feature primitive, designing a texture descriptor to better represent image contents is a key to improve CBIR results. For this purpose, an extended feature vector combining the Gabor filter and co-occurrence histogram method is suggested and evaluated for quantitywise and qualitywise retrieval performance criterion. For the better CBIR performance, assessing similarity between high dimensional feature vectors is also a challenging issue. Therefore a number of distance metrics (i.e. L1 and L2 norm) is tried to measure closeness between two feature vectors, and its impact on retrieval result is analyzed. In this paper,experimental results are presented with several CBIR samples. The current results show that 1) the overall retrieval quantity and quality is improved by combining two types of feature vectors, 2) some feature is better retrieved by a specific feature vector, and 3) retrieval result quality (i.e. ranking of retrieved image tiles) is sensitive to an adopted similarity metric when the extended feature vector is employed.
정인성,박태원,채희창,이기형,이환성 전북대학교 공업기술연구소 1992 工學硏究 Vol.23 No.-
A method is presented for determining the free vibration characteristics of a rotating blade having nonuniform spanwise properties and cantilever boundary condition. The equations which govern the coupled flapwise, chordwise, and torsional motion of such a blade are solved using an integration matrix method. By expressing the equation of motion in matrix notation, utilizing the integrating matrix as an operator, and applying the boundary condition, the equations are formulated into an eigenvalue problem whose solution may be determined by conventional method. Computed results are compared with experimental data.