共查询到20条相似文献，搜索用时 31 毫秒
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《Journal of Informetrics》2007,1(3):214-225
Never before in history has mankind produced and had access to so much data, information, knowledge, and expertise as today. To organize, access, and manage these valuable assets effectively, we use taxonomies, classification hierarchies, ontologies, controlled vocabularies, and other approaches. We create directory structures for our files. We use organizational hierarchies to structure our work environment. However, the design and continuous update of these organizational schemas with potentially thousands of class nodes organizing millions of entities is challenging for any human being.The taxonomy visualization and validation (TV) tool introduced in this paper supports the semi-automatic validation and optimization of organizational schemas such as file directories, classification hierarchies, taxonomies, or other structures imposed on a data set for organization, access, and naming. By showing the “goodness of fit” for a schema and the potentially millions of entities it organizes, the TV tool eases the identification and reclassification of misclassified information entities, the identification of classes that grow too large, the evaluation of the size and homogeneity of existing classes, the examination of the “well-formedness” of an organizational schema, and more. As a demonstration, the TV tool is applied to display and examine the United States Patent and Trademark Office patent classification, which organizes more than three million patents into about 160,000 distinct patent classes. The paper concludes with a discussion and an outlook to future work. 相似文献
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为了提高视频信息的检索效果，美国卡内基·梅隆大学视频数字图书馆对录像制品进行自动编码处理，并从中提取有关信息生成地点附注。在该检索界面中，可以将特定事件与其发生地建立关联，实现从事件、时间到地点的论题检索，或从地点入手检索视频信息的空间查询方法。本文揭示了录像片段在地图中的表现，展望了视频信息检索的未来。 相似文献
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网络环境下的信息存取与目录学创新 总被引：5，自引：0，他引：5
从目前书目数据的开放存取、开放存取资源目录、书目教据通用开放标准、网络书目情报服务、目录强化与信息存取,以及开放源代码、书目软件等技术和工作现状,可以看到目录学理论的新发展和书目工作的不断创新。对这些方面的分析研究有利于目录学的发展。参考文献31。 相似文献
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Stan Trembach Instruction Coordinator/Reference Librarian 《Slavic & East European Information Resources》2013,14(1):111-112
ABSTRACT This article describes how The Search Engine for Online Historical Directories provides enhanced access for genealogical researchers to valuable family information contained in difficult-to-browse directories that have been made available online by institutions that have not provided sophisticated search tools. 相似文献
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《The Reference Librarian》2013,54(57):111-125
Abstract Librarians have long relied on printed directories and ephemera stored in vertical files to provide access to national political information. The Internet seems an ideal medium for evanescent political information because it allows for continuous updating of information directly by political organizations, enables the creation of large collections of diverse materials, frees librarians from the labor of ordering and updating materials, and permits remote access. There follows a list of political Internet resources that have proved to be valuable for reference in academic and public libraries. 相似文献
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本文从分析、比较现用的身份识别、存取控制、软件保护、数据加密等安全保护措施后, 针对管理信息系统数据和程序的相互关系, 提出了一个分级式保护模式。在一个实用系统中分别实现了目录保护、程序文件保护, 数据库文件保护, 口令方式保护, 还对多用户存取权限管理, 多用户环境下如何解决数据冲突和死锁问题以及数据库文件的分级使用提出一些新的考虑和设想。 相似文献
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David Z. Chroust 《Slavic & East European Information Resources》2013,14(3):130-140
The article discusses the various types of texts produced by the Czech immigrant community in the United States in the nineteenth century. An interesting example is the periodical Hospodá?. The author lists some bibliographies and directories that researchers can consult in order to locate such material, but much of it remains either unknown, difficult to access, or both. Buildings can also be considered texts. He urges librarians, archivists, and scholars of sources to work more with these materials. 相似文献
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佛寺志是一种特殊类型的地方志,具有重要的历史与文化价值,近年来得到了更多的重视。在新编普通古籍目录与方志目录体系中,佛寺志的归类不尽相同。佛寺志为其中大多数目录收录,且归属于史部地理类专志。一半以上的目录在其专志类目下为佛寺志设置寺观专类。 相似文献
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《International Information and Library Review》2000,32(3-4):307-312
Recent developments in high-speed network initiatives have raised awareness of an increased potential for sharing information among institutions. At the core of current plans to take advantage of this potential is the use of standards-based directory servers as repositories of authentication and authorization data. Such repositories can be used to regulate and facilitate access to network resources between persons associated with institutions or with cooperating institutions. Included in these plans is provision for storing and using certificates to establish trust relationships between partners communicating over the network. When the environment is medical, other information such as credentials or access paths to patient data may also be stored in directories. The question has been raised whether, in emergencies, a mechanism for bypassing the more rigorous authentication and/or authorization requirements be provided to allow access to information essential to treating the emergency by individuals who would otherwise not be allowed such access. There is an increasing awareness of the fundamental conflict between a patient's right to privacy and the patient's right to receive medical treatment in a complete and efficient manner. 相似文献
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Susan Dente Ross 《广播与电子媒介杂志》2013,57(2):254-270
Video market entry options available to telephone companies under the Telecommunications Act of 1996 have First Amendment implications that will affect the constitutional value of telephone video. These entry options impose regulatory constraints upon providers and differ in potentials for provider speech, speaker access, and content diversity. The author concludes that the Act's open video system option best advances First Amendment interests in increased diversity of and access to speech. 相似文献
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改革开放30年来,目录学实践取得了长足进展.书目产品类型多样,包括书目索引文摘的各类著作、数据库以及各种网络指南、搜索引擎和学科信息门户.书目编撰借助信息技术而提高了效率,发展了书目的描述和检索性能.书目工作标准从编目著录条例、分类、主题标引发展到网络环境下的中文元数据标准、互联网数据标准和领域元数据标准等信息组织标准.网络的发展,拓展了书目利用与服务的范围,促使书目情报服务向信息资源公共获取转移. 相似文献
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MEDLINEplus: building and maintaining the National Library of Medicine's consumer health Web service 总被引：1，自引：0，他引：1
MEDLINEplus is a Web-based consumer health information resource, made available by the National Library of Medicine (NLM). MEDLINEplus has been designed to provide consumers with a well-organized, selective Web site facilitating access to reliable full-text health information. In addition to full-text resources, MEDLINEplus directs consumers to dictionaries, organizations, directories, libraries, and clearinghouses for answers to health questions. For each health topic, MEDLINEplus includes a preformulated MEDLINE search created by librarians. The site has been designed to match consumer language to medical terminology. NLM has used advances in database and Web technologies to build and maintain MEDLINEplus, allowing health sciences librarians to contribute remotely to the resource. This article describes the development and implementation of MEDLINEplus, its supporting technology, and plans for future development. 相似文献
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张海游 《大学图书情报学刊》2010,28(1):44-48
介绍隐蔽网络和学术隐蔽网络的基本定义,分析查找学术隐蔽网络而临的问题,提出查找学术隐蔽资源的核心是找到相关的数据库。重点讨论如何较为系统地使用辅助工具查找隐蔽网络数据库的方法和策略,即使用学术搜索引擎、隐蔽网络专门目录、主要搜索引擎和通用网络目录的主题分类。 相似文献
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《The Reference Librarian》2013,54(67-68):29-40
Summary Academic libraries now provide reference service for the remote user in at least two ways: by the telephone and by electronic mail. The remote user at a computer workstation, however, may not have access to a telephone and may be poorly served by the asynchronous nature of electronic mail. New technologies and collaborative software for serving remote users in real-time such as Internet chat, paging and instant messaging, whiteboard, application sharing, and audio and video conferencing offer new possibilities for remote access to reference services. In this article we review these technologies and report the results of a trial project at Temple University. The results are promising for real-time reference services. 相似文献
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《Journal of Government Information》1995,22(5):389-402
U.S. Department of Labor unemployment insurance files, ES202, are increasingly used to study new business start-ups, but their accuracy is questionable, and this could negatively influence some theories of entrepreneurship. This study assesses the accuracy of ES202 new business data from four states: Iowa, North Dakota, Maine, and Arkansas, and discusses the theoretical implications of the study for entrepreneurship. Rural areas in each state were scientifically selected. In each area, telephone directories, community/business leader surveys, on-site inspections, newspaper stories, and postal records were used to develop a list of all new businesses. Telephone interviews with about 1,500 entrepreneurs from the lists were undertaken to verify information about their firms. The ES202 list was then compared with the composite list developed from alternative data sources. The ES202 list failed to include many new businesses in the study areas. Because ES202 lists are so biased, researchers should not use them to build or test theories of entrepreneurship. ES202 lists can be used when supplemented with other lists. 相似文献
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This study updates and extends our knowledge of cable television community access viewership, a little researched topic of the past decade. Results of a random telephone survey are reported that reveal community access viewership has increased in recent years. Program viewership preferences and sources of program information are discussed. Community access viewing motivations and satisfaction are examined as predictors of channel viewership. Possible factors explaining the high level of reported viewership are suggested and recommendations for future research are proposed. 相似文献
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《Government Information Quarterly》2004,21(2):199-218
As a citizen's information system, the World Wide Web (Web) has led to a revolution in the information providing use of government services. It has also led to major changes in the very relationships that citizens have with their governments. The present work is an empirical analysis of the Web sites maintained by the Spanish regional government administrations. The aim is to determine the current degree of development of the technological application, the alternative service that the citizen is offered, and its evolution since 1997. The results show there to be different degrees of regional development, a notable advance in the number of new entities offering Internet-based services. They also demonstrate a slow evolution in the introduction of substantial changes into Web sites that have already been created and a great heterogeneity with respect to services provided (personnel directories, that is, addresses of functionaries and political appointees working in an Administration, press releases, tourist information, statistics, etc.). This study forms part of a broader investigation of the incidence of Internet technology within the Spanish Administration, that is, the hierarchy of organizations that administer Spain's public services. 相似文献