共查询到20条相似文献，搜索用时 203 毫秒
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吴玉珍 《中国图书情报科学》2004,(8):46-48
通过对文献的手编分类标引与机编分类标引的比较分析，根据文献分类规则，结合具体实例，对如何利用机读目录分类标引的特殊功能增加分类检索点进行了阐述。 相似文献
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在计算机检索条件下,对涉及多重列类的文献分类标引,应当调整手工检索条件下的分类标引规则和方法。充分揭示文献主题内容的多学科属性,以增强分类检索系统的组配检索功能,增加文献检索的途径,提高计算机分类检索系统的查全率和查准率,提高文献利用率。 相似文献
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研究了交通运输文献分类的三个问题：交通运输文献的分类标准;交通运输文献的分类体系;交通运输文献的分类方法. 相似文献
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文章研究了矿业工程文献分类的三个问题:矿业工程文献的分类标准;矿业工程文献的分类体系;矿业工程文献的分类方法。 相似文献
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文章研究了自动化技术文献分类的三个问题:自动化技术文献的分类标准;自动化技术文献的分类体系;自动化技术文献的分类方法。 相似文献
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[目的/意义] 叙词表相关关系在标引和检索中具有重要作用,相关关系的分类与关系属性定义在信息组织中有重要研究意义。[方法/过程] 分析生态学种间关系与叙词表相关关系的特征,建立二者的联系,通过不同特征的组合实现相关关系到种间关系的分类,并从种间关系角度探讨相关关系的构建。[结果/结论] 相关关系可以唯一地分类到捕食、竞争、寄生、共生四类种间关系中,不同类别相关关系具有不同的特征,能够为相关关系的构建提供新的思路。 相似文献
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刑事案件的多维关联分析模型研究 总被引：2，自引：1，他引：1
为了发现刑事案件中犯罪的特点与规律,本文建立了刑事案件的多维关联分析模型.首先,进行刑事案件的数据清理;然后,建立刑事案件多维数据模型,其中包括概念分层与建立数据立方体;在此基础上,利用改进的频繁谓词集算法寻找频繁谓词集,根据最小支持度与最小置信度要求,产生强关联规则;最后,对结果进行解释与评价.建立模型后,本文利用刑事案件的样本数据,详细地描述了整个模型的建立过程,并且利用大连市公安局提供的真实数据验证了模型的可用性与正确性并对结果进行了详细分析.本文建立的刑事案件多维关联分析模型为今后城市公安数据挖掘应用研究提供了参考. 相似文献
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尽管ＩＰＣ力图包括全部应用技术领域，并列有约６万条类目，人们在使用该表时仍有时找不到满意的类名，些时可考虑：（１）使用外延更广的上位类号扩检；（２）查找余类；（３）查找意义相近的类目等办法。此外还应考虑其相关类目：（１）方法类与设备类，只标明设备的类目有可能包含相关的生产方法，反之亦然；（２）方法类与产品类；（３）功能类与应类。 相似文献
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王强 《现代图书情报技术》2008,3(8):63-69
设计并采用Java语言实现基于事务数据库标识列表的频繁项集的产生算法——TidlistApriori。通过与采用Hash-Tree的Apriori算法进行比较,表明TidlistApriori能够提高频繁项集的产生效率,可以成为主题关联挖掘的有效算法工具。 相似文献
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《期刊图书馆员》2013,64(4):385-398
Starting slowly in the middle of the seventeenth century, the number of scientific and technical periodicals had reached a total of ouer 1,000 titles by 1790. To deal with them as a body of literature and to provide an effectiue framework upon which to construct generalizations concerning them, it is desirable and necessary to develop a classification of the formats in which they tended to appear. Three classifications of scientific periodicals are examined: one that originated at the turn of the nineteenth century, another that appeared in 1839, and Fielding H. Garrison's classification of 1934. Various formats in the period before 1790, including those dealing with society publications, academic literature, and the essays resulting from the awarding ofprizes by scientific societies, are eramined in the light of the classification in which they appeared, and some of the issues they raise are discussed. It is fairly clear, for instance, that by the end of the eighteenth century the periodical has still not been segregated in bibliographic access and treatment, either as a vehicle for or as a repository of scientific information. Miscellaneous writings of indiuidual or multiple authors are in many cases regarded in the same light, and are sometimes indistinguishable from titles that can be regarded as bonafide periodicals. The basic differentiation to be made is that between an original and a derivative literature, without begging the question of originality in the conceptual sense. Borrowing, translating, extracting, and reprinting were so prevalent that distinctions are difficult to make in this early period. A classification of formats (types of component unit publications) is offered derived from an analysis of some of the titles on the lists, and some of the other facets under which the scientific and technical periodical of this era should be examined are listed. 相似文献
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基于概念向量空间的文档语义分类模型研究 总被引：1，自引：0，他引：1
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结合粗糙集的属性约简和神经网络的分类机理,提出了一种混合算法。首先应用粗糙集理论的属性约简作为预处理器,把冗余的属性从决策表中删去,然后运用神经网络进行分类。这样可以大大降低向量维数,克服粗糙集对于决策表噪声比较敏感的缺点。试验结果表明,与朴素贝叶斯、SVM、KNN传统分类方法相比,该方法在保持分类精度的基础上,分类速度有明显的提高,体现出较好的稳定性和容错性,尤其适用于特征向量多且难以分类的文本。 相似文献
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Ludo Waltman Nees Jan van Eck Thed N. van Leeuwen Martijn S. Visser 《Journal of Informetrics》2013,7(2):272-285
The SNIP (source normalized impact per paper) indicator is an indicator of the citation impact of scientific journals. The indicator, introduced by Henk Moed in 2010, is included in Elsevier's Scopus database. The SNIP indicator uses a source normalized approach to correct for differences in citation practices between scientific fields. The strength of this approach is that it does not require a field classification system in which the boundaries of fields are explicitly defined.In this paper, a number of modifications that were recently made to the SNIP indicator are explained, and the advantages of the resulting revised SNIP indicator are pointed out. It is argued that the original SNIP indicator has some counterintuitive properties, and it is shown mathematically that the revised SNIP indicator does not have these properties. Empirically, the differences between the original SNIP indicator and the revised one turn out to be relatively small, although some systematic differences can be observed. Relations with other source normalized indicators proposed in the literature are discussed as well. 相似文献
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<中国图书馆分类法>中法律图书分类体系已经不能适应法学的发展对图书分类的需要.应编制一套较为科学合理的、国内通用的法律图书分类体系,取代现有的D9体系,并终止两种体系并存的局面.法律类图书应作为一个大类,以DF为代码单独立类,以反映当代学科体系中法律与政治已经成为两个相对独立的学科这一现实.法律图书分类体系中基本类目的设置和类目详表也严重落后于当代法学的发展,存在较大的完善空间. 相似文献