共查询到19条相似文献，搜索用时 296 毫秒
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文献检索课教学中知识整合是一个动态的、复杂的过程,是提升学生信息素质能力的重要途径。结合相关文献研究,对传统文献检索课与基于知识整合的文献检索课进行比较分析,构建了基于知识整合的文献检索课教学模式,该模式为文献检索课教学研究提供了一般的方法论,对文献检索课教学改革起到一定参考作用。 相似文献
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隐含语义检索及其应用 总被引：5，自引：1，他引：4
隐含语义检索(Latent Semantic Indexing, LSI) 是一种基于概念的文献检索方式。它区别于传统的基于用户查询条件与文档的单词匹配的文献检索方法, 根据文档与查询条件在语义上的关联而向用户提交查询结果。本文介绍了隐含语义检索在文献检索中的一种实现方法, 为文献检索提供了一种新的途径。 相似文献
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构建个性化知识推荐系统是数字图书馆实现个性化信息服务的有效手段,推荐服务的关键在于完整地理解用户偏好并能准确作出判断。提出了一种基于语义扩展的知识推荐方法,通过分析读者文献检索、浏览的行为提取读者偏好,利用扩展激活模型建立读者偏好档案,据此对文献资源进行匹配和分级,从而向读者提供个性化的知识推荐服务。 相似文献
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随着电子引文信息的爆炸式增长,为了帮助科研工作者从海量文献数据中发现研究热点、了解领域发展趋势,科研机构和商业集团开发了一系列基于Web的文献检索工具.近年来,伴随着数据挖掘技术和信息可视化技术在知识发现领域中的迅速发展,融合上述两种技术的文献分析工具已经被研发出来并获得了很好的用户反馈.文章首先阐述了传统的文献检索工具的功能及其存在的局限性,调研了融合可视分析技术的文献分析工具并总结其功能和特点以及为文献分析带来的新颖视角,介绍北京邮电大学通信软件工程中心研发的可视分析组件--VisLib及其实用场景,最后展望了科技文献分析工具的进一步发展方向. 相似文献
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浅谈文献检索课网络化教学的设计与实现 总被引：7，自引：1，他引：6
网络环境下,文献检索课的教学内容和教学方式都面临着变革和挑战.本文分析了文献检索课的现状,指出了文献检索课开展网络教学的意义,重点介绍了如何编制和实现网络化教学软件,从而构建一种新型的文献教学模式. 相似文献
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袁玉花 《图书馆工作与研究》2011,(12):41-43
NoteExpress具有文献检索、文献管理、文章撰写等功能,现已成为科研人员从事学术研究、个人知识管理和发表论文等科研活动的一款通用参考文献管理软件。该软件也为提高科技查新质量和查新效率提供了软件支持平台。本文介绍了科技查新与NoteExpress的概念,及NoteExpress在文献检索与科技查新报告撰写等过程中的应用。 相似文献
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本文主要针对国家科技图书文献中心（NSTL）科技词表的构建特点及智能化文献服务应用方法开展研究。采
用实例剖析的方法,分析词表通用构建方法与常规应用模式,在此基础上重点研究NSTL科技词表的构建特点和应用方
式。NSTL文献服务平台从生产到服务的各个业务流中引入NSTL科技词表,提升了国家科技文献信息战略资源的有效
组织、深度揭示和知识关联,提供智能检索服务。在新的互联网应用环境下,词表规范不再是一种约束,而是一种引
导,一种知识关系汇聚方式,融入科技文献服务的方方面面,产生新的应用方式。 相似文献
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This paper describes features and methods for document image comparison and classification at the spatial layout level. The methods are useful for visual similarity based document retrieval as well as fast algorithms for initial document type classification without OCR. A novel feature set called interval encoding is introduced to capture elements of spatial layout. This feature set encodes region layout information in fixed-length vectors by capturing structural characteristics of the image. These fixed-length vectors are then compared to each other through a Manhattan distance computation for fast page layout comparison. The paper describes experiments and results to rank-order a set of document pages in terms of their layout similarity to a test document. We also demonstrate the usefulness of the features derived from interval coding in a hidden Markov model based page layout classification system that is trainable and extendible. The methods described in the paper can be used in various document retrieval tasks including visual similarity based retrieval, categorization and information extraction. 相似文献
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认为用户在使用文献传递平台的过程中会根据自身体验产生一系列的评价,这些评价影响着用户行为。基于“用户行为还原法”,建立文献传递用户评价与用户行为关系模型。对21位资深文献传递员进行访谈,总结出影响用户评价的因素,将这些因素与文献传递用户的4类行为（选择平台、信息检索、提交申请、获取文献）一一对应进行分析,最后为文献传递平台管理机构提出建议：①保证文献获取率;②提高服务效率;③加强资源整合与揭示;④简化流程,方便读者。 相似文献
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文检课为核心的信息素质教育模型的构建 总被引：6，自引：0，他引：6
阐述了韶关学院图书馆文检课的发展历程，特别是教学手段建设和教学方法改革方面取得的成效。随着课程体系的完善，新生教育和讲座的开展，学习网站和传统媒体的揉合，文检课为核心的信息素质教育模型业已凸显。 相似文献
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Most recent document standards like XML rely on structured representations. On the other hand, current information retrieval systems have been developed for flat document representations and cannot be easily extended to cope with more complex document types. The design of such systems is still an open problem. We present a new model for structured document retrieval which allows computing scores of document parts. This model is based on Bayesian networks whose conditional probabilities are learnt from a labelled collection of structured documents—which is composed of documents, queries and their associated assessments. Training these models is a complex machine learning task and is not standard. This is the focus of the paper: we propose here to train the structured Bayesian Network model using a cross-entropy training criterion. Results are presented on the INEX corpus of XML documents. 相似文献
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This study introduces a novel framework for evaluating passage and XML retrieval. The framework focuses on a user’s effort
to localize relevant content in a result document. Measuring the effort is based on a system guided reading order of documents.
The effort is calculated as the quantity of text the user is expected to browse through. More specifically, this study seeks
evaluation metrics for retrieval methods following a specific fetch and browse approach, where in the fetch phase documents
are ranked in decreasing order according to their document score, like in document retrieval. In the browse phase, for each
retrieved document, a set of non-overlapping passages representing the relevant text within the document is retrieved. In
other words, the passages of the document are re-organized, so that the best matching passages are read first in sequential
order. We introduce an application scenario motivating the framework, and propose sample metrics based on the framework. These
metrics give a basis for the comparison of effectiveness between traditional document retrieval and passage/XML retrieval
and illuminate the benefit of passage/XML retrieval. 相似文献
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Genetic Approach to Query Space Exploration 总被引：2，自引：0，他引：2
This paper describes a genetic algorithm approach for intelligent information retrieval. The goal is to find an optimal set of documents which best matches the user's needs by exploring and exploiting the document space. More precisely, we define a specific genetic algorithm for information retrieval based on knowledge based operators and guided by a heuristic for relevance multi-modality problem solving. Experiments with TREC-6 French data and queries show the effectiveness of our approach. 相似文献