共查询到20条相似文献，搜索用时 625 毫秒
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[目的/意义]信息检索处理的是相关性的不确定性问题,但在技术层面则通常将不确定性转化为确定性的处理方法,对信息内容中存在的不确定性语义关注不多,而这一问题在某些信息检索应用场景中可能显著地影响信息检索的结果,因此针对这类不确定性语义,需要考虑针对性的处理方法。[方法/过程]提出基于D-S证据理论的不确定性语义表示方法和将这类不确定性语义特征与文本特征、主题特征相融合的检索模型,并利用公开的数据集开展实验研究,对所提出的模型进行实验。[结果/结论]D-S理论中的证据区间概念能够描述上述不确定性,多源证据融合方法也能够将这类不确定性语义特征与文本特征、主题特征融合,并通过模型训练得出理想参数,进而改进检索结果。这一模型在理论上具有包容性与可扩展性,基于该模型融合其他检索方法是进一步需研究的内容。 相似文献
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综合性学术搜索引擎研究 总被引：9，自引：1，他引：8
选择了四种当前国外典型的可免费使用的综合性学术搜索引擎Google Scholar、Scir-us、BASE、Athenus进行了研究,分析了各自的特色,对比了它们的资源覆盖范围、检索功能和检索效果,提出了当前这类学术搜索引擎存在的主要问题:资源的学术质量问题、检索结果的归并与去重问题、相关性排序问题。在此基础上,探讨了其对图书情报机构、用户和资源供应商的有利和不利的影响。 相似文献
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集成检索系统中资源选择技术及算法 总被引：2，自引：0，他引：2
介绍近年来出现的主要资源选择技术的基本思想及算法,包括基于资源相关度排序的资源选择技术、基于文献分布状况的资源选择技术、基于检索成本计算的资源选择技术和基于资源内容等级结构的资源选择技术,并对目前的资源选择技术进行分析和评价。 相似文献
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使用学习模型定量分析信息用户检索行为特征,对于扩展传统用户研究的方法、促进学科间融合具有重要意义。本文首先分析了信息用户检索决策中的强化学习特征,并选择了强化学习模型中的Bush-Mosteller模型和Borgers-Sarin模型对用户的检索决策行为形成过程进行模拟。模拟结果表明Borgers-Sarin模型成功捕捉了用户检索行为的形成过程,说明用户学习规则特征表现为将预期与反馈结果进行比较;模型的参数表明用户行为的黏滞性、惯性特征明显。 相似文献
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以农业类科技查新为例,从检索资源、检索词与检索式3个方面探讨科技查新的信息检索策略。在检索资源方面,提出专业性原则与文献类型原则的选择标准,形成资源类型、学科属性与文献类型相结合的资源选择方法;在检索词方面,探讨检索词确定的一般过程与辅助工具的应用,并阐释农业查新项目的特点对检索词分析的影响;在检索式方面,探讨检索式构造的一般过程,形成常用农业科技查新检索系统的检索式构造技巧,并构造检索式通式。 相似文献
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基于本体的图书馆文献资源检索技术研究 总被引：1，自引：1，他引：0
图书馆文献资源共享是图书馆发展的一个重要标志,而知识存储与检索是图书馆文献资源共享与传播的关键技术。目前基于目录分类、关键词等的文献资源检索方法缺乏语义信息,无法满足用户的检索请求。本文引入领域本体作为资源描述的知识基础,提出了基于本体的三层结构智能检索体系模型,并解决了关系数据库存储本体时的知识映射问题。 相似文献
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图书馆文献资源共享是图书馆发展的一个重要标志,而知识存储与检索是图书馆文献资源共享与传播的关键技术。目前基于目录分类、关键词等的文献资源检索方法缺乏语义信息,无法满足用户的检索请求。本文引入领域本体作为资源描述的知识基础,提出了基于本体的三层结构智能检索体系模型,并解决了关系数据库存储本体时的知识映射问题。 相似文献
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Milan Grba 《Slavic & East European Information Resources》2017,18(3-4):152-164
This article surveys a sample of sources of the information about Romania available to British readers in nineteenth century British newspapers and periodicals. It traces first contacts between the Romanian lands and Britain after the union of the principalities of Wallachia and Moldavia in 1859, then after their independence from the Ottoman Empire. The article highlights an increased Romanian interest in British periodicals, which reported and reviewed Romanian literature and scholarship. The article concludes that nineteenth century British newspapers and periodicals offer a great variety and wealth of new material previously unavailable or unknown to researchers. It also states that only a portion of a large quantity of this material has been indexed and is therefore available via the bibliographic sources mentioned in the article. The author argues for the need of a new and updated British-Romanian bibliography, which can draw on new online resources offering access to thousands of new newspapers and periodical records. 相似文献
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《Slavic & East European Information Resources》2013,14(4):25-33
ABSTRACT The paper looks at library approval plans for material published in Slavic, East European, and Eurasian countries from the selector's point of view. Reasons why a selector would or would not want one are examined. Success with approval plans requires monitoring receipts, as well as good and ongoing communication among the selector, the acquistions department, and the vendor. A preliminary list of vendors offering approval plans for the countries of the region appears in the appendix. 相似文献
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《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
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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
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为进一步提升武汉科技信息共享服务平台使用效率,本文从平台资源建设、资源应用、供需对接方式和供需特点等方面分析了武汉科技信息资源服务现状;基于需求和利用的角度,结合平台管理实践和走访用户、问卷调查等研究方法,从信息资源需求主体和平台自身建设管理两个维度,找出制约科技资源供需对接的主要因素;以市场化和制度化为创新理念,从政策创新、机制创新、市场化服务、环境营造、人才培养等方面提出平台建设由“资源集聚”向“需求导向”转变的对策建议. 相似文献
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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
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《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
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《Legal Reference Services Quarterly》2013,32(3-4):223-229
SUMMARY The Nevada Constitution provides voters with the ability to propose new statutes, amendments to existing statutes, and amendments to the State constitution through the initiative petition process. Voters can also approve or disapprove of existing statutes through the referendum petition process. Both require the circulation of a petition to collect a minimum number of signatures before the Secretary of State will place the measures on the ballot for the general election. As with other topics of law, Nevada has a profound shortage of research resources on initiatives and referenda, but State law and government Web sites provide enough information to allow for significant research. 相似文献
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SUMMARY This article is a case study of Ariel use at the University of Texas at Austin. The author divides the history of Ariel use into three distinct stages: resistance, full implementation, and enhanced. For each stage the advantages and disadvantages of using Ariel are discussed. The author concludes that using Ariel saves both money and staff time and permits faster delivery of documents than other methods. 相似文献
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《Journal of Interlibrary Loan, Document Delivery & Electronic Reserve》2013,23(4):113-119
SUMMARY CISTI, the Canada Institute for Scientific and Technical Information, is one of the world's largest document delivery suppliers, and was among the first to be fully automated. The revolutionary Intel-liDoc system, developed during the years 1993 to 1995, provided for end-to-end automation of the document delivery process, which has enabled CISTI to improve its service and accommodate growth. From the beginning Ariel was, and remains, an integral part of IntelliDoc. This article describes how Ariel has been integrated into IntelliDoc and into CIS-TI's services, showing the benefits to CISTI and to its clients. 相似文献