共查询到20条相似文献，搜索用时 453 毫秒
1.
副主题词是指主题词所论述的重点课题的自然范畴或者通常发生的某一方面,对主题词限定的一类词汇。副主题词本身涉及医学研究的特定范畴,通过对副主题词频率的统计分析可以揭示医学研究的热点与方向。本文采用基本检索的方式,检索了近年来在中国生物医学文献数据库（CBM）所标引的文献,从中抽取3000篇文献,对其中的副主题词出现的频次进行统计,并对统计结果以图表的形式进行了分析。希望信息用户能根据这些分析更加了解在学科上医学文献的研究热点与特色,以期待更好的为临床及科学研究服务。 相似文献
2.
3.
在海量信息的背景下,用户画像是实现对用户精准推荐服务的有效工具。科技信息用户画像的关键环节是根据用户关注的文献信息进行主题词抽取。文献主题词抽取的质量直接影响用户画像以及基于用户画像的内容推荐的精准度。鉴于目前常用的文献主题词抽取方法存在高维特征表征稀疏、泛化能力差、易用性受限等问题,提出基于文本共现词分析与TextRank算法的主题特征抽取方法。用该方法对农业科技信息平台用户关注和浏览的文献数据进行主题抽取,将获得的核心特征词作为用户画像的标注主题词,并据此构建用户主题推荐表达式进行文献推荐效果验证。结果显示,采用该方法的文献推荐准确率为93.3%,显著优于高频词法（70.4%）、共现词分析法（74.1%）和TextRank算法（77.8%）,表明改进的文献主题词抽取方法在农业信息用户画像及信息推荐服务中具有很好的应用前景。 相似文献
4.
概念分面组配型自动分类系统 总被引：1，自引：1，他引：0
１选择自动分类模式的基本思路当前，迫切需要符合下列要求的一种自动分类模式：（１）能够较快付诸实用；（２）有较高的检索效率，特别是检准率；（３）为了保证较高的检索效率，可适当采用人工辅助抽词。从自动分类研究的进展情况看，要达到（１）（２）点要求而完全不用人工辅助抽词（准确地抽取文献主题的核心词），目前是不可能做到的。也就是说，（１）（２）（３）点都是必要的；（４）充分利用系统资源，提供更多检索功能。概念分面组配型自动分类模式比较符合以上要求。这种模式可简略表述如下：以文献题名作为主要抽词对象；适当… 相似文献
5.
提出一种新的政务本体术语自动抽取的方法。首先通过中文分词技术和单字合并法提取政务文本中的词作为候选术语;通过C-value求解法和TF-IDF算法对候选术语进行过滤抽取,从而实现政务领域术语的自动抽取。通过实验比较,发现该方法在不影响领域术语抽取召回率的同时可以提高抽取术语的正确率。 相似文献
6.
适用于隐含主题抽取的K最近邻关键词自动抽取 总被引：1，自引：0，他引：1
众所周知,K最近邻方法作为机器学习领域的一个经典的方法,在很多领域都有出色的表现.本文利用K最近邻方法的思想,提出了一种基于K最近邻的关键词自动抽取方法.现有的关键词抽取技术仅仅是对正文词汇的抽取,不能抽取隐含主题.隐含主题的抽取是关键词自动抽取技术的难点,但是该方法可以有效抽取隐含主题.该方法首先对数据进行预处理,使用向量空间模型将文本表述为数学化语言;然后,以人工标注关键词的文献数据作为训练集,使用K最近邻方法构建新文献的关键词候选集;最后,根据关键词本身的特点对候选关键词做了有效的后处理.实验表明,该方法不仅可以提高关键词抽取的准确率和召回率,还可以有效抽取文章的隐含主题. 相似文献
7.
在向文献数据库发送检索提问后,用户检索到的往往是数量众多且线性排列的文献记录,如何进一步分类这些文献记录以方便用户使用是信息检索领域的重要课题之一。本文以一个比较狭小的主题(脊髓损伤)为文献查询提问,探索利用原数据库中提供的论文主题相似性信息对检索到的文献记录进行聚类的方法,并对每个类别赋予类别标签。本文①利用生物医学权威文献数据库Medline,分别检索PubMed中有关脊髓损伤的部分文献(源文献),实际操作中我们抽取近两年发表的有关脊髓损伤的1906篇文献中前50篇;②利用PubMed中的相关文献功能分别检索出源文献的相关文献(共5108篇),筛选出频次较高的相关文献(出现频次大于或等于5次,共31篇);③形成源文献和相关文献的关联矩阵,根据该矩阵对来源文献进行聚类分析;④分别采用人工分析和主题词的向量空间模型算法提取各类的文献内容或类标签,初步评价分类结果的正确性。经过基于相似性的聚类分析,可以将脊髓损伤的源文献分为3个大类,对比人工分析和主题词向量空间模型方法对来源文献的内容提取,二者基本相符。就本文研究涉及的主题而言,利用文献数据库中提供的论文相关性信息对检索结果进行再次分类的方法是可行的。 相似文献
8.
专利术语抽取是专利文献信息抽取领域的一项重要任务,有助于专利领域词表的构建,有利于中文分词、句法分析、语法分析等工作的进行。文章通过分析专利术语的特点并制定相应的语料标注规则进行人工标注,采用条件随机场（conditional random fields,CRFs）对标注后的数据进行训练和测试,实现了通信领域的术语抽取。标注方法采用基于字的序列标注,精确率、召回率和F值分别达到80.9%、75.6%、78.2%,优于将词和词性等信息作为特征的方法,表明所提出的专利术语抽取方法是有效的。 相似文献
9.
分众分类标签的语义模糊性和标签无序性使得检索效率越来越低,为准确定位标签语义,旨在研究一种新的方法,从主题词表的词间关系判断标签间的语义关系。以《中国分类主题词表》教育类主题词搜索Delicious网站得到的相关标签作为数据源,分析标签与主题词的重叠度,选择《中国分类主题词表》和ERIC在线教育词表作为标签的语义关系抽取工具,认为相关标签集中语义关系较为丰富。 相似文献
10.
文章对图情领域有关用户研究的文献进行了分析,给出了面向使用的用户研究热点内容及主流研究方法,引入分面分类的思想深入剖析用户研究主要方法,并给出了建议。 相似文献
11.
《Slavic & East European Information Resources》2013,14(1-2):123-143
ABSTRACT The article examines the most important periodicals of ethnic minorities in Poland. After 1989, many ethnic groups (e.g., Germans and Romanies) were allowed to publish journals and newspapers for the first time since the end of World War II. The publications examined show the rich cultural life of the various ethnic groups as well as their current status in Poland. In addition to popular titles, some scholarly publications are also discussed. 相似文献
12.
Jon C. Giullian 《Slavic & East European Information Resources》2013,14(3):278-284
The author answers a reference question on bibliographic sources for the Ukrainian periodical press 1840–1850. Helpful publications include bibliographies, guides, and library catalogs. These potentially make mention of revolutionary developments in Hungary (such as the Twelve Points paragraph of the Demands of the Hungarian Nation in March 1848, the subsequent April Laws, and Hungary's declaration of independence in April 1949), and elsewhere in the Hapsburg Empire. 相似文献
13.
Josie Barnes Parker 《图书馆管理杂志》2013,53(6):731-737
ABSTRACTIn today's current political environment raising support for millage renewals, bond campaigns or even millage continuations for public libraries is affected by national politics, and a tendency towards tax aversion on principle across the country. The lessons we can learn from the governing boards of small and rural public libraries are worth raising up to a greater national consciousness. Board governance, community consciousness, and facilities management are clear and logical tools that elected boards of public libraries can use to politick for support of libraries. 相似文献
14.
《Slavic & East European Information Resources》2013,14(1):25-74
ABSTRACT The history of the almanac in Croatia is reconstructed through primary research in bibliographic and archival sources. The almanac is a vehicle for knowledge communication in informal contexts, engaging both oral tradition and literary forms traceable to medieval literacy and ways of structuring knowledge. The history of the almanac in Croatia reflects the changing context of the book trade, literacy, and the evolution of language. Four main stages are identified: (1) the beginning of the annual almanac in the seventeenth century; astrological almanacs reflecting the sensibility of the Baroque period; (2) the Enlightenment's stimulation of almanac publishing in the spirit of contemporary secular reforms in agriculture and education; (3) nineteenth-and twentieth-century almanac trade, showing complex and overlapping networks for the production, distribution and appropriation of printed almanacs;(4) roughly the end of World War II, when the almanac slowly moved out of the role of a popular mass medium and into specialized niches represented by regional, diaspora, and religious almanacs. 相似文献
15.
Neil De Young 《Publishing Research Quarterly》2009,25(3):139-146
Some key questions for publishers in today’s market are: Could Amazon’s recent merger and acquisitions strategy create a disruptive or paradigm shifting business model in the publishing industry? Do their recent actions post mergers and acquisitions illustrate a predicable pattern of behaviour that publishers can strategize around? This paper will explore these questions and look at some of the possible reasons behind Amazon’s business practices and the possible consequences to publishers. 相似文献
16.
Barbara Lison 《图书馆管理杂志》2013,53(2):180-187
ABSTRACTGerman authorities are expecting more than 1 million refugees by the end of 2015. These people come to Germany to seek protection and assistance and to build a new life, therefore it is important to welcome them and to assist them in their integration as soon as possible. This situation creates a versatile and perfectly fitting opportunity for cultural and educational programs, including libraries, which can play a vital role in this integration process. The key to integration is the knowledge of the German language, and the most important challenge now is to teach the necessary language skills to as many asylum-seekers as possible. 相似文献
17.
《Journal of Web Librarianship》2013,7(1):41-59
Abstract Many libraries use RSS to syndicate information about their collections to users. A survey of 65 academic libraries revealed their most common use for RSS is to disseminate information about library holdings, such as lists of new acquisitions. Even though typical RSS feeds are ill suited to the task of carrying rich bibliographic metadata, great potential exists for developing applications that can exploit metadata exposed to Web services via RSS. Using the MODS metadata format, entire catalog records can be seamlessly embedded in RSS 2.0 feeds. Existing tools, such as Library of Congress Java toolkits and XSLT stylesheets, can facilitate this process, while a new XSLT stylesheet may be used to create the RSS feeds complete with MODS records. As an example of the added functionality these MODS/RSS feeds can offer, records from a MODS-enriched RSS feed can be ingested into a non-RSS application such as Zotero. As more emerging library technologies use Web services architectures to handle data objects, the ability to syndicate catalog records will become more critical to providing innovative library Web services. 相似文献
18.
Michelle Rodino-Colocino 《Critical Studies in Media Communication》2013,30(5):375-390
This essay investigates key moments in the history of personal digital assistant (PDA) marketing to women. Analyzing promotional texts for three PDAs that received considerable press coverage from 1999 to 2001, this essay explores the cultural significance of the convergence of anxieties about women's place in the gendered division of labor with the computer industry's changing marketing imperatives. Drawing on an array of promotional texts, including news articles, press releases, promotional Web sites, and ads appearing in newspapers and magazines, this paper tells the story of how the computer industry aimed to sell smaller, faster computing devices to women while promising to mediate and thus reproduce women's overwork as paid and familial laborers. After experimenting with the PDA as a sexy fashionable gadget for working women, marketers approached women as mothers with “Audrey,” an Internet appliance designed for the kitchen. 相似文献
19.
Lindsay Dillingham 《Journal of Business & Finance Librarianship》2013,18(4):313-327
This study explores the attitudes and actions of bank managers toward communication spending during recession. Results of this study indicate that organizational leaders cut communication spending early during recession and also erroneously rely on the bank's financials to mitigate irrational customer withdrawals. This research is used to illustrate the need for public librarians to meet the needs of bank stakeholders when their institution ceases to communicate during crises, for academic librarians to educate students in undergraduate and graduate programs regarding heightened information needs during recession, and for corporate librarians to understand a potential avenue for competitive advantage during recession. 相似文献
20.
指出共链分析已在商务网站评价、竞争情报分析、商业信息挖掘等领域有广泛应用。综合运用共链分析与社会网络分析的方法,对国内市场份额排名前50位的电子商务网站的企业竞争态势与竞争关系及地位进行综合分析,并对企业间潜在竞争关系挖掘进行初步探索,以期能对竞争情报方法论研究和国内电子商务市场的发展提供一定的启示和参考。研究发现,共链网络中节点的程度中心性与企业实际的市场份额之间存在显著的相关关系,且竞争关系多存在于不同组织下业务类型相似的企业实体,而有些互补服务的企业之间则是合作关系的存在,这一发现或许能为未来电子商务市场发展战略规划与制定提供一定的指导和帮助。 相似文献