P2P网络中基于本体驱动的网格资源发现的研究

提出了一种新的语义网格资源发现方法。P2P网络用来分发和查找资源目录,每个点能够提供资源描述和背景知识,能够查找网络中存在的资源信息。每个点都有自己的本体,该本体由网络上知识传播来完成,因此不需要一个中心本体来描述和匹配资源,具有很好的扩展性。     

Examining the effectiveness of real-time query expansion

Interactive query expansion (IQE) (c.f. [Efthimiadis, E. N. (1996). Query expansion. Annual Review of Information Systems and Technology, 31, 121–187]) is a potentially useful technique to help searchers formulate improved query statements, and ultimately retrieve better search results. However, IQE is seldom used in operational settings. Two possible explanations for this are that IQE is generally not integrated into searchers’ established information-seeking behaviors (e.g., examining lists of documents), and it may not be offered at a time in the search when it is needed most (i.e., during the initial query formulation). These challenges can be addressed by coupling IQE more closely with familiar search activities, rather than as a separate functionality that searchers must learn. In this article we introduce and evaluate a variant of IQE known as Real-Time Query Expansion (RTQE). As a searcher enters their query in a text box at the interface, RTQE provides a list of suggested additional query terms, in effect offering query expansion options while the query is formulated. To investigate how the technique is used – and when it may be useful – we conducted a user study comparing three search interfaces: a baseline interface with no query expansion support; an interface that provides expansion options during query entry, and a third interface that provides options after queries have been submitted to a search system. The results show that offering RTQE leads to better quality initial queries, more engagement in the search, and an increase in the uptake of query expansion. However, the results also imply that care must be taken when implementing RTQE interactively. Our findings have broad implications for how IQE should be offered, and form part of our research on the development of techniques to support the increased use of query expansion.     

有关数词的两点质疑——以《关于〈现代汉语词典(第5版)〉词类标注的说明》为例

《关于〈现代汉语词典(第5版)〉词类标注的说明》一文将"几、许多"归为数词,将"第一、第三"归为序数词,值得商榷。前者与目前语法学界的普遍看法相乖离,较好的处理是:"几"为疑问代词,"许多"为形容词。后者与《现代汉语词典(第5版)》所述不一致,"第一、第三"为表序数的词组而非序数词。     

关系代数的相应运算在SQL中的实现

关系代数是一种抽象查询语言，是关系数据操纵语言的一种传统表达方式。SQL是一种结构化的查询语言，已成为关系数据库的国际标准语言。本文给出了二者之间的一种对应关系。     

语文课堂教学中学生创新性思维的培养

语文是一门发挥学生创造性的基础学科。在语文课堂教学中，可通过鼓励学生质疑、激发学生想象、引导学生讨论等方式，培养学生的创新性思维，提高学生素质。     

索引优化设计及性能评测

数据查询的效率是影响数据库应用系统整体性能的其中一项重要指标，本文着重探讨了索引在优化数据库系统性能方面的作用及具体的实现原则，并通过对查询语句效率的对比，介绍了在SQL Sever中的查询语句性能测定的方法。     

岑参避世思想说质疑——读《岑参评传》有感并与廖立先生商榷

廖立先生的《岑参评传》向我们较为全面地展示了岑参其人,但岑参的思想中却并未如廖先生所说的那样具有避世因素,而是充满了奋发向前、为家为国而努力拼搏的入世基调,并且其思想中存在着远大抱负与在现实中不得意之间的冲突所造成的苦闷。     

多尔后现代课程观质疑

后现代课程观引发了关于课程问题的世界性讨论,引起了当代课程理论研究与课程开发实践的巨大变化,并给我国课程改革提供了新的思维方式.但是,作为一种正在发展中的具有强烈批判性和反传统色彩的理论框架,它也存在自身的局限性.文章试从教育目标、课程内容、教学过程和学习评价四个方面对其予以质疑,并阐明自己的看法.     

内容与形式关系质疑

我国现行哲学教科书对内容与形式的关系问题，有些论述并不科学。其实，从哲学意义上说，同一内容既没有多种形式，同一形式也不能表现不同内容；内容屯形式既不构成矛盾运动，也不能相互转化；形式对内容并不能产生巨大的反作用，旧形式也不会被新内容所利用。     

MIDAS的数据查询效率比较

本文介绍如何应用Delphi建立一个多层分布式系统,并且讨论了使用三种查询方式通过MIDAS从远程数据服务器上取回查询结果的方法,比较了这三种查询方式的执行效率.