我国特殊教育信息化研究现状述评     

李青  李淼 《现代教育技术》2013,23(7):19-23

教育信息化是教育现代化的抓手和推动力,为了解我国特殊教育信息化发展的研究现状,文章界定了特殊教育信息化的涵义,从时间、研究内容、地域以及参考类型等多个维度对我国特殊教育信息化的学术研究文献进行分析和解读,从而整理出目前特殊教育信息化研究现状,并参考发达国家在该领域的经验提出未来的研究重点和方向,以期为其他特殊教育信息化研究提供参考和借鉴。  相似文献   

Using query expansion in graph-based approach for query-focused multi-document summarization     

Lin Zhao  Lide Wu  Xuanjing Huang 《Information processing & management》2009

This paper presents a novel query expansion method, which is combined in the graph-based algorithm for query-focused multi-document summarization, so as to resolve the problem of information limit in the original query. Our approach makes use of both the sentence-to-sentence relations and the sentence-to-word relations to select the query biased informative words from the document set and use them as query expansions to improve the sentence ranking result. Compared to previous query expansion approaches, our approach can capture more relevant information with less noise. We performed experiments on the data of document understanding conference (DUC) 2005 and DUC 2006, and the evaluation results show that the proposed query expansion method can significantly improve the system performance and make our system comparable to the state-of-the-art systems.  相似文献   

有关信息技术投资成本与收益分析的文献综述   总被引：1，自引：1，他引：0  

叶凤云  李君君  谢阳群 《图书情报工作》2007,51(1):136-138

从信息技术投资评估理论研究进展、信息技术的生产率悖论、信息技术投资分析的理论基础和方法三个方面,对近年来国内外对信息技术投资成本与收益分析的理论进行系统的文献综述,全面阐述国内外在信息技术投资成本与收益分析方面的研究进展。  相似文献   

基于事件要素的组合模型微博热点事件摘要提取     

李纲  徐伟  王馨平 《图书情报工作》2018,62(1):96-105

[目的/意义] 为帮助读者从热点事件产生的海量微博报道中快速了解事件的来龙去脉,提高微博事件摘要的准确性和可读性,提出一种基于事件要素的多模型微博热点事件时间轴摘要提取方法。[方法/过程] 针对微博文本特征,结合主题模型（LDA）与互信息最大熵模型（MaRxEnt-MI）的特点提取事件摘要关键词,以微博传播价值和主题相关性为标准筛选微博,以时间-摘要关键词-摘要微博的形式生成时间轴摘要。[结果/结论] 利用人工标注的测试集,与传统的TextRank方法进行对比,F值提高8%-13%,内部测试表明摘要可读性提高明显。实验文本和测试集的数量及事件丰富度需要进一步扩展,应考虑更多的加权策略模型以提高摘要的准确性。实验结果及测试反馈表明,本文的方法能很好满足用户对热点事件摘要信息需求,提高微博摘要提取的准确率。  相似文献   

Using only cross-document relationships for both generic and topic-focused multi-document summarizations     

Xiaojun Wan 《Information Retrieval》2008,11(1):25-49

In recent years graph-ranking based algorithms have been proposed for single document summarization and generic multi-document summarization. The algorithms make use of the “votings” or “recommendations” between sentences to evaluate the importance of the sentences in the documents. This study aims to differentiate the cross-document and within-document relationships between sentences for generic multi-document summarization and adapt the graph-ranking based algorithm for topic-focused summarization. The contributions of this study are two-fold: (1) For generic multi-document summarization, we apply the graph-based ranking algorithm based on each kind of sentence relationship and explore their relative importance for summarization performance. (2) For topic-focused multi-document summarization, we propose to integrate the relevance of the sentences to the specified topic into the graph-ranking based method. Each individual kind of sentence relationship is also differentiated and investigated in the algorithm. Experimental results on DUC 2002–DUC 2005 data demonstrate the great importance of the cross-document relationships between sentences for both generic and topic-focused multi-document summarizations. Even the approach based only on the cross-document relationships can perform better than or at least as well as the approaches based on both kinds of relationships between sentences.

Xiaojun WanEmail:

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化学二氧化锰研究进展     

王书民  ;郑行望  ;樊雪梅  ;王建芳 《商洛师范专科学校学报》2008,(2):35-40

目的展望化学二氧化锰（CMD）工业的发展趋势,方法综述CMD的制备、改性等方面的研究进展情况,介绍几种常见的CMD合成法,结果随着研究的深入,新的化学工艺不断出现,化学二氧化锰的性能会越来越好,并将接近或超越电解二氧化锰（EMD）,结论CMD研究仍将是化学领域的热点之一.  相似文献   

Weighted consensus multi-document summarization   总被引：1，自引：0，他引：1  

Dingding Wang  Tao Li 《Information processing & management》2012

Multi-document summarization is a fundamental tool for document understanding and has received much attention recently. Given a collection of documents, a variety of summarization methods based on different strategies have been proposed to extract the most important sentences from the original documents. However, very few studies have been reported on aggregating different summarization methods to possibly generate better summary results. In this paper, we propose a weighted consensus summarization method to combine the results from single summarization systems. We evaluate and compare our proposed weighted consensus method with various baseline combination methods. Experimental results on DUC2002 and DUC2004 data sets demonstrate the performance improvement by aggregating multiple summarization systems, and our proposed weighted consensus summarization method outperforms other combination methods.  相似文献   

我国竞技体育人才环境研究综述     

雒满  刘光宇  李成梁 《辽宁体育科技》2012,34(1):9-11

从竞技体育人才发展的地域差别、保障机制、竞技体育人才的流动及竞技体育后备人才发展等方面对我国竞技体育人才环境现状进行分析,结果表明：我国目前对竞技体育人才环境还没有形成系统的理论研究,有待于进一步完善。  相似文献   

体育教学价值研究述评     

张文静  孙勤 《体育科技文献通报》2008,16(12):123-125

本文分析了改革开放后我国体育教学价值研究的特点。这特点表现为三方面：体育理论研究中忽视体育价值研究、体育教学研究中很少关注教学价值、体育研究中价值与目标、功能关系模糊。在结合有关研究文章基础上。对体育教学价值研究进行反思。  相似文献   

自动摘要方法综述   总被引：2，自引：0，他引：2  

谭翀  陈跃新 《情报学报》2008,27(1):62-68

自动摘要是计算机语言学领域的一个研究重点,自动摘要的研究和应用受到了计算机学、语言学、认知心理学等相关学科的广泛关注.本文讨论了摘要的定义及其分类.依据自动摘要的特点对其分类,并作为构造自动摘要系统和思考自动摘要技术发展的参考和启示.本文概述了自动摘要的发展历史和研究现状,并将现有的自动摘要方法分为三类,分别阐述了这三类方法的基本特征和研究方法,并剖析了它们的优点和不足.本文着重讨论了基于篇章结构的方法的几个不同研究方向及其局限和趋势.最后,文章讨论了自动摘要研究存在的问题,并指出自动摘要的研究趋势.  相似文献