上下文信息检索强调把有关用户、资源和查询的上下文与信息检索技术统一组织在一个整体框架内,以向用户提供最适合用户需求的检索信息.全面介绍了上下文信息检索的研究现状,概括了国内外研究者对上下文信息检索过程中涉及的上下文因素及其分类,并从用户上下文、文档上下文和系统上下文3个角度对国内外有关上下文信息检索技术的研究作了概述.最后从5个方面探讨了上下文信息检索领域存在的挑战,指出对用户检索背后需求的探究、基于语义的理解和融合上下文的信息检索模型等将是该领域目前亟需解决的问题.%With the development of IR techniques; contextual information retrieval(CIR) has been identified to be a promising direction for improving search. In CIR; the retrieval of information depends on the time and place of submit ting query;history of interaction;task in hand;and many other factors that are not given explicitly but lie implicitly in the interaction and surroundings of searching;namely the context In this paper;a survey on research work of CIR was given;and the contextual elements of CIR were summarized. In addition;contextual elements were summarized into user context;document context;and system context and the related research work where introduced At last; the key challenges in CIR were discussed from five aspects. Exploitation of real need behind user's query;search based on semantic un derstanding; contextual information retrieval model and et al were pointed out as main problems needed to be resolved.
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