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网络适应性改造对《中图法》未来发展的启示 总被引：2，自引：0，他引：2
The efforts made by OCLC researchers to enhance Dewey Decimal Classification (DDC) so as to adapt it to Web environment are described. From the experience of OCLC researchers, the author puts forward some proposals for the future development of Chinese Library Classification. 相似文献
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分析仪器光电检测系统设计 总被引：2，自引：1，他引：1
为帮助学生深入理解分析仪器中的光吸收定律、光传感器和信号检测系统的原理及数据处理方法,设计了一种基于单片机和A/D转换器的光电检测系统。介绍了分析仪器中光电检测系统的原理及设计方法;针对微弱光电流检测的问题,阐述了基于DDC114的数据采集系统的软硬件设计思路和抗干扰措施。 相似文献
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分类法的生命力在于不断修订，《杜威法》和《中图法》均在近年来根据科学知识发展的需要分别进行了第21版和第4版的修订，形成了各自的修订特色。本文对《杜威法》第21版与《中图法》第4版计算机技术类目的设置进行了比较，以求探讨分类法在科学性、实用性等方面不断完善的方法。 相似文献
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AbstractNearly 25 years have elapsed since the last comprehensive measure of the percentage of academic libraries that employ the Dewey and Library of Congress systems of classification. To provide updated statistics, the researchers surveyed all 3793 academic libraries via their online catalogs. The findings indicate that the use of Dewey has declined over the past four decades. Teachers’ Colleges and Community Colleges in particular have higher rates of Dewey use than large research or professional universities. This information may help support academic library reclassification decisions. 相似文献
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Ryan Ireland 《Public Library Quarterly》2013,32(4):306-318
This article frames the public library and its system of organization as rhetorical tools. By providing an historic overview of libraries and their formation, the author recognizes the severed connection between library systems and the field of rhetoric, specifically the rhetorical canon of memoria. He seeks to reconnect memoria to the public library by recognizing the place-based nature of both classical memoria and library classification systems. The implications, he contends, run deep in libraries as seemingly neutral entities shape collective memory and education. Finally, the author provides a section that focuses on how digital-age libraries could be shaped, maintained, and managed in a way that recognizes memory as a rhetorical tool that aids in knowledge formation. 相似文献
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ABSTRACT This article highlights key events in the relationship between OCLC Online Computer Library Center, Inc. and the Dewey Decimal Classification (DDC) system. The formal relationship started with OCLC's acquisition of Forest Press and the rights to the DDC from the Lake Placid Education Foundation in 1988, but OCLC's research interests in the DDC predated that acquisition and have remained strong during the relationship. Under OCLC's leadership, the DDC's value proposition has been enhanced by the continuous updating of the system itself, development of interoperable translations, mappings to other schemes, and new forms of representation of the underlying data. The amount of categorized content associated with the system in WorldCat and elsewhere has grown, as has worldwide use of the system. Emerging technologies are creating new opportunities for publishing, linking, and sharing DDC data. 相似文献
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对于中外分类法的映射研究,国内多关注于对计算机自动映射方法的探讨,缺乏对词表类目复杂语义关系的具体研究。本文在对DDC和《中图法》理学领域共计4639个类目进行人工直接映射的基础上,通过统计其匹配依据,得出结论:理学类目下数学、物理、化学、天文、地理等不同学科内匹配依据的总体分布呈现一致性的特点,这为检验计算机自动匹配准确性提供了方法。实验表明,类目名称、注释、主题词、类目关系作为主要的判断依据,占映射类目的63%,依据匹配规则占映射的5.14%,依据书目记录的匹配占31.87%,因此论文建议实现计算机自动匹配时,除类目自身信息外,还需考虑书目记录的匹配。 相似文献
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薛继华 《南通职业大学学报》2013,(3):85-89
数据抽取是数字下变频器的核心技术之一,抽取滤波器链设计的优劣将直接影响整机的工作性能。文章介绍了总抽取因子为256的抽取滤波器链设计,并用Matlab软件对其性能进行了仿真,最后,在专用数字下变频器HSP50216上构建了该抽取滤波器链。 相似文献
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国内分类法映射研究多关注于间接映射方法的实现,对词表类目复杂语义关系研究较少。当前分类法采用大量的组合类目形式表达一些复杂的概念,由于不同类表之间组合类目的特点及作用不同,导致组合类目之间映射存在一定难度。针对DDC和《中图法》除生物科学以外的理学领域类目,分析了组合类目的分布特点,从语义层将组合类目划分为并列关系、属分关系、限制关系、交叉关系四种类型,总结组合类目的两种基本功能,从等同、包含和交叉三种关系类型研究组合类目直接映射的匹配规则,为进一步构建《中图法》和DDC的自动映射系统提供参考依据。表10。参考文献11。 相似文献