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David A. Evans (born 1948, St Louis, USA) is the president, CEO, and chief scientist of JustSystems Evans Research, Inc. (JSERI). He is a prominent figure in the field of computational linguistics, best known for research on work in indexing using natural language processing, and in ontology learning, especially in medical informatics. He attended Stanford University, receiving his Ph.D. in Computational Linguistics there in 1982. He was on the faculty of Carnegie Mellon University from 1983 until 1996, and founded their Computational Linguistics Program and Laboratory for Computational Linguistics (1986). In 1993, his research was spun-out from Carnegie-Mellon, as Claritech. Claritech became a research and development subsidiary of JustSystems and its name was change to Clairvoyance Corporation in 1996, before becoming JSERI in 2007. ==Contributions== He has made many contributions to the field of computational linguistics and information retrieval,〔''(Noun-phrase analysis in unrestricted text for information retrieval ),'' David A. Evans and Chengxiang Zhai. ''Proceedings of the 34th Annual Meeting of the Association for Computational Linguistics'', 1996, pp. 17–24〕 authoring books, many research papers and 24 US patents. From 1988 onwards, he developed the CLARIT system, one of the first large scale information indexing and extraction systems based on syntactic language analysis and ontology discovery. CLARIT has participated in the first Text REtrieval Conferences (TREC), in the multilingual CLEF (Cross Language Evaluation Forum),〔(Cross Language Evaluation Forum ) (CLEF).〕 and in the Asian NTCIR] (NII Test Collection for IR Systems)〔(NTCIR ), National Institute of Informatics Test Collection for IR Systems.〕 Evaluations. Evans was elected a Fellow of the American College of Medical Informatics in 2000. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「David Andreoff Evans」の詳細全文を読む スポンサード リンク
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