ISBN-10和ISBN-13批量互换算法及程序   总被引：2，自引：0，他引：2  

黎邦群 《现代图书情报技术》2008,3(2):91-93

主要介绍ISBN-10和ISBN-13之间的差异,给出ISBN-10和ISBN-13之间进行批量互相转换的算法,并在对算法进行分析的基础上,采用VB6.0实现了ISBN-10和ISBN-13批量互换程序。  相似文献   

图书馆应重视古旧书报刊收藏--兼谈《中国古旧书报收藏交流指南》     

许馨 《图书馆建设》2006,(1):105-106,109

针对高校图书馆古旧书报刊流失损耗的问题，提出高校图书馆、公共图书馆应该重视古旧书报刊收藏。请有关领导给予经济、人力支持；并愿图书馆从业人员增强古旧书报刊的收藏意识，学习古、旧书报刊收藏知识。  相似文献   

数字图书馆网络存储模式评析     

徐迈 《图书馆学研究》2006,(9):25-27

本文介绍了目前主要的存储体系结构，分析了各种体系结构的主要特点和适用环境，并对数字图书馆的存储发展趋势作了一些探讨。  相似文献   

如何提高数字图书馆设备的采购质量     

李振钱 《图书馆杂志》2004,23(12):36-38

本文从设备的先进性与实用性、经济性之间的关系，考虑设备的安全性、稳定性和可靠性，准备招投标文件和保证设备的质量、可维护性等方面论述了如何提高数字图书馆设备的采购质量。  相似文献   

网络存储领域内的核心技术——iSCSI   总被引：9，自引：0，他引：9  

吉炽平 《现代图书情报技术》2004,20(6):46-48

数据的异地实时存储日趋增多使得网络存储技术日渐重要。iSCSI 作为网络存储的核心技术充分利用了现有IP 网络的成熟性和普及性优势, 对经济合理以及便于管理的存储设备提供了直接访问的能力, 其低廉、便捷、开放、安全、标准等众多优异品质在未来必将得到充分的完善与发展。  相似文献   

Understanding storage environmental stability during power outages: A key issue in sub-tropical climates     

Edward Kinfai Tse 《文物保护研究》2016,61(1):31-36

Efficient air-conditioning systems facilitate climate control in modern museums, libraries, and archives. The climate in Hong Kong is typically hot and humid, so the survival of collections is highly dependent on 24-hour air-conditioning systems to maintain the desired environment in repositories of archives and books, or artefact stores. The continuous operation of such systems in turn relies on a number of factors, such as uninterrupted electricity supply, an active maintenance programme, daily monitoring of their performance and quick response to irregularities as well as backup or alternative systems to support the air-conditioning load in case they are down for servicing. From the risk management point of view, unlike the latter four factors, electricity supply is an external factor that cannot be guaranteed. Fluctuation in the power level that results in stoppage of air-conditioning equipment is not uncommon even in well-developed countries. Long power outages could be catastrophic as they might lead to irreversible damage to collection items as a result of fast, large, changes in temperature and relative humidity (RH) towards the external environment if the air-tightness or hygrothermal stability of the storage are not good enough. Understanding storage environmental stability, especially during electrical power disruptions, is an essential part of the preservation measures and disaster preparedness necessary to protect valuable collections in cultural heritage institutions in the region.  相似文献   

人工神经网络在火灾探测中的应用   总被引：1，自引：0，他引：1  

夏太武  彭京华 《河北工业大学成人教育学院学报》2006,21(2):28-31,12

火灾的早期探测是较为复杂且具有重要意义的研究课题。针对传统火灾探测方法存在的不足,提出了一种基于人工神经网络技术的火灾自动探测系统,即采用黄金分割优选法对网络隐含层节点数进行优选,采用优于BP算法的LM算法进行网络学习训练。实验结果表明不仅这种系统具有拟合精度高和运算速度快等优点,且探测效率良好。  相似文献   

Comparison of three web-scale discovery services for health sciences research     

Rosie Hanneke  Kelly K. O'Brien 《Journal of the Medical Library Association》2016,104(2):109-117

Objective

The purpose of this study was to investigate the relative effectiveness of three web-scale discovery (WSD) tools in answering health sciences search queries.

Methods

Simple keyword searches, based on topics from six health sciences disciplines, were run at multiple real-world implementations of EBSCO Discovery Service (EDS), Ex Libris''s Primo, and ProQuest''s Summon. Each WSD tool was evaluated in its ability to retrieve relevant results and in its coverage of MEDLINE content.

Results

All WSD tools returned between 50%–60% relevant results. Primo returned a higher number of duplicate results than the other 2 WSD products. Summon results were more relevant when search terms were automatically mapped to controlled vocabulary. EDS indexed the largest number of MEDLINE citations, followed closely by Summon. Additionally, keyword searches in all 3 WSD tools retrieved relevant material that was not found with precision (Medical Subject Headings) searches in MEDLINE.

Conclusions

None of the 3 WSD products studied was overwhelmingly more effective in returning relevant results. While difficult to place the figure of 50%–60% relevance in context, it implies a strong likelihood that the average user would be able to find satisfactory sources on the first page of search results using a rudimentary keyword search. The discovery of additional relevant material beyond that retrieved from MEDLINE indicates WSD tools'' value as a supplement to traditional resources for health sciences researchers.  相似文献   

可传递关系的算法实现     

李令斗  王敏  李建俊 《洛阳工业高等专科学校学报》2006,16(2):42-43

可传递二元关系的判定是离散数学中的一个难点．对于某个关系来说,判定它是否可传递的方法有许多．本文给出了判断可传递二元关系的一个充要条件,以及在计算机上实现的具体算法．  相似文献   

一个K-均值文档聚类的改进算法     

吴景岚  刘燕  朱文兴 《闽江学院学报》2004,25(2):48-52

k均值算法是一个常用的局部搜索算法，它的主要缺陷是容易陷入局部极小，并且该局部极小解与全局最优解往往有很大的偏差。本文提出一个基于K-均值的迭代局部搜索文档聚类算法。该算法以k均值算法所得到的解作为初始解，从该初始解开始作局部搜索。在搜索过程中接受部分劣解。当解无法改进时，算法对所得到的局部极小解做适当强度的扰动后进行下一次的迭代，以跳出局部极小，从而拓展了搜索的范围。实验结果表明该算法对文档数据集聚类的正确性迭99％以上。  相似文献