关键词： 信息检索系统   检索服务   界面展示  

摘要： 对国外信息服务系统进行调研,将信息系统界面分为基于检索结果的类目列表式界面展示、基于检索结果的图形化界面展示、基于用户行为特征的标注式界面展示、基于预设问题的导航式界面展示、基于自然语言提问的答案界面展示5种类型,并分析每种类型界面展示的特点及背后的关键技术。

关键词： 基于内容检索   图像   视频   音频  

摘要： 基于内容的多媒体检索是多媒体领域的一个热点,已广泛应用于很多领域.首先从基于内容的多媒体检索的概念与特点出发,接着详细地分析基于内容的颜色直方图、纹理、形状和空间关系的图像检索,并简要分析基于内容的视频与音频检索.最后指出对多媒体信息检索的展望.

关键词： 网络信息检索   个性化服务   管理应用  

摘要： 网络信息检索在技术上具有动态性、平权性与交互性等特点,在发展中逐步呈现智能化、个性化与多元化发展趋势,同时对网络信息检索的管理同样离不开技术的支持。

关键词： 分布式   信息检索   技术  

摘要： 分布式信息检索是信息检索研究的一个重要方向。主要对分布式信息检索概念、分布式信息检索方法、搜索引擎技术进行了分析,提出了各自的优缺点,最后对分布式信息检索技术的发展前景进行阐述。

关键词： 信息检索技术   标准号   计算机技术   标准目录   专业机构   检索方式   标准信息   检索工具  

摘要： 传统的标准信息检索方式是根据标准化专业机构出版发布的标准目录汇编．或者标准化年鉴等书籍．以分类索引和标准号索引为主要手段进行人工查询。近些年来。随着计算机技术的发展及应用，信息检索技术也获得了长足发展，使用户可以摆脱纸型的传统检索工具，

关键词： 相关反馈   翻译优化   跨语言信息检索   查询翻译  

摘要： 本文提出了一种新的基于相关反馈的跨语言信息检索查询翻译优化技术,就实现该技术的关键步骤＂估计检索词在相关文献集合中的翻译概率＂设计了4种不同的算法,并通过伪相关反馈实验比较了这4种算法,验证了查询翻译优化技术的有效性.实验结果显示,4种翻译优化算法都能够提高检索结果的精度,其中基于词对齐的翻译算法相对更优越.此外,查询式的长度和检索主题的特征对不同查询翻译优化算法产生着不同程度的影响.

关键词： Information retrieval   Passage retrieval   Ontology   Reference collection   Knowledge management  

摘要： Technical documents, which often have complicated structures, are often produced during Architecture/Engineering/Construction (A/E/C) projects and research. Applying information retrieval (IR) techniques directly to long or multi-topic documents often does not lead to satisfactory results. One way to address the problem is to partition each document into several "passages", and treat each passage as an independent document. In this research, a novel passage partitioning approach is designed. It generates passages according to domain knowledge, which is represented by base domain ontology. Such a passage is herein defined as an OntoPassage. In order to demonstrate the advantage of the OntoPassage partitioning approach, this research implements a concept-based IR system to illustrate the application of such an approach. The research also compares the OntoPassage partitioning approach with several conventional passage partitioning approaches to verify its IR effectiveness. It is shown that, with the proposed OntoPassage approach, IR effectiveness on domain-specific technical reports is as good as conventional passage partitioning approaches. In addition, the OntoPassage approach provides the possibility to display the concepts in each passage, and concept-based IR may thus be implemented. (C) 2011 Elsevier Ltd. All rights reserved.

关键词： Cross-Lingual Information Retrieval   Concept-based Information Retrieval   Social Web   Wikipedia  

摘要： In this article we show how Wikipedia as a multilingual knowledge resource can be exploited for Cross-Language and Multilingual Information Retrieval (CLIR/MLIR). We describe an approach we call Cross-Language Explicit Semantic Analysis (CL-ESA) which indexes documents with respect to explicit interlingual concepts. These concepts are considered as interlingual and universal and in our case correspond either to Wikipedia articles or categories. Each concept is associated to a text signature in each language which can be used to estimate language-specific term distributions for each concept. This knowledge can then be used to calculate the strength of association between a term and a concept which is used to map documents into the concept space. With CL-ESA we are thus moving from a Bag-Of-Words model to a Bag-Of-Concepts model that allows language-independent document representations in the vector space spanned by interlingual and universal concepts. We show how different vector-based retrieval models and term weighting strategies can be used in conjunction with CL-ESA and experimentally analyze the performance of the different choices. We evaluate the approach on a mate retrieval task on two datasets: JRC-Acquis and Multext. We show that in the MLIR settings, CL-ESA benefits from a certain level of abstraction in the sense that using categories instead of articles as in the original ESA model delivers better results. (C) 2012 Elsevier B.V. All rights reserved.

关键词： 语义网   信息检索   定量分析  

摘要： 文章对我国基于语义网的信息检索技术的研究论文从发表时间、作者、刊载期刊、论文主题、合著率等方面进行了定量分析,总结出我国在该领域的研究现状,发现不足,提出建议。