• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2002.05a
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• pp.95-99
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• 2002

정보검색에서 가장 중요하면서도 어려운 문제 중의 하나는 사용자가 원하는 정보를 찾기위한 효율적인 질의를 작성하는 일이다 순수한 부을 검색 시스템은 문서와 질의 사이의 유사도를 나타내는 문서값을 계산할 수 없기 때문에, 검색된 문서들을 질의를 만족하는 정보에 따라 정렬할 수 없다. 부을 검색 시스템의 이러한 단점을 보완하는 방법으로 P-norm 모델이 개발되었다. 본 논문에서는 높은 검색 효과를 제공하는 지역적 문맥 분석 피드백을 이용한 전보검색 모델을 제안한다. 제안한 지역적 문맥 분석 피드백모델이 적합성 피드백이나 P-norm 모델보다 우수함을 설명하고, 또한 성능 비교를 통하여 이를 입증한다

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.2 no.1
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• pp.9-14
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• 2002

Boolean retrieval is simple and elegant. However, since there is no provision for term weighting, no ranking of the answer set is generated. As a result, the size of the output might be too large or too small. Relevance feedback is the most popular query reformulation strategy. in a relevance feedback cycle, the user is presented with a list of the retrieved documents and, after examining them, marks those which are relevant. In practice, only the top 10(or 20) ranked documents need to be examined. The main idea consists of selecting important terms, or expressions, attached to the documents that have been identified as relevant by the user, and of enhancing the importance of these terms in a new query formulation. The expected effect is that the new query will be moved towards the relevant documents and away from the non-relevant ones. Local analysis techniques are interesting because they take advantage of the local context provided with the query. In this regard, they seem more appropriate than global analysis techniques. In a local strategy, the documents retrieved for a given query q are examined at query time to determine terms for query expansion. This is similar to a relevance feedback cycle but might be done without assistance from the user.

• Journal of Plant Biology
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• v.1 no.2
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• pp.5-6
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• 1958

Scdvm rotundifolium LEE, D. B. sp. nov. Korean name: Doonggunip-qwongui-birum The external characteristics of this species are similar to those of Sedum spectabile BOREAU, but the leaf is rounded, the inflorescence is globose, and the color of the ilower is a deeper purplish-red. Description of this species. Root: Perennial, facisculate, rather thick, with several stems. Stem: Fasciculate,15~25cm. high, a little nutate, reddish, putting forth buds on the lower part in the autumn. Leaf: Fleshy, opposite, discoid or broad ovate, no petiole, red, irregular serrate margin, lcaf"base light cordate or round, width and length both 2. 5~4.5 cm. Flower: Tiny flower making the glomerule on stem apex. Calyx: symscpal, 5 parted, green, lanceolatc_ Corolla: 5 petals, beat-shaped, purplish-red. Stamens: 10, five of them opposile and reat of five alternate with petals, filaments same length as petals, anther red, pollen yellow. Pistils: 5, separate, each ovary triangular rhombus, opposite the petals, stigmas' length about Imm. apexes pointed. Collected on October 22, 1957, and July 26, 1958. Habitat: Growing in the rock of Mt. Choowang, North Kyongsang Province. Korea. Korea.