共查询到17条相似文献,搜索用时 171 毫秒
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基于网格的数字图书馆互操作技术研究 总被引:5,自引:0,他引:5
以支持大规模资源共享和协作为核心的网格技术在解决数字图书馆(DLs)互操作问题,尤其是在异构平台兼容、集成已有系统方面有着独特的优势。本文对目前数字图书馆互操作主要解决方案进行分析和对比,包括:分布式搜索(Distributed Search)、元数据收集(Metadata Harvesting)、中间(Middleware)技术,指出各自的优势和不足,提出一种新的数字图书馆互操作框架——数字图书馆网格DL Grid,探讨利用先进的网格技术解决各数字图书馆的互操作性问题。 相似文献
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一种基于移动Agent的数字图书馆互操作框架 总被引:2,自引:0,他引:2
互操作是实现数字图书馆(DLs)的集成(或联邦)需要解决的关键问题,其目的是将Web上广泛分布的,自治的,异构的DLs联合起来,利用统一的查询界面实现对多个DLs的透明访问,首先介绍了DLs互操作的实现方法,并指出了各自的优缺点:在此基础上,提出一种基于移动Agent的DLs互操作框架,并给出了基于该框架实现的一个原型系统。 相似文献
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数字图书馆网格互操作框架 总被引:4,自引:0,他引:4
随着全球数字图书馆(DLs)的迅猛发展,互操作成为亟待解决的重要问题。目前DLs互操作的主要解决方案包括:分布式搜索、元数据收集、中间件技术等,在实现大规模的数字图书馆互操作方面都存在一定的局限性。文章通过对已有方案的分析和对比,指出各自的优势和不足,并在OAI-PMH框架的基础上,结合先进的网格技术,提出全新的数字图书馆互操作框架—数字图书馆网格DLGrid,为解决大规模数字图书馆的互操作提供一种新途径。 相似文献
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数字灌区网格GIS的系统框架 总被引:6,自引:0,他引:6
实现灌区信息的互联互通互操作是数字灌区建设的重要目标,网格GIS是实现数字灌区建设目标的关键技术,提出了灌区网格GIS系统框架,包括灌区数据标准、规范与共享;空间数据库群和业务数据库集成管理;灌区服务体系和灌区应用示范等方面内容,在系统中数据库群之间的集成依靠虚拟数据库技术和联邦数据库技术,系统的服务划分为本地服务和协同服务,各种服务采用注册机制实现共享和协同。 相似文献
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支持OAI-PMH的元数据互操作体系结构设计与实现 总被引:16,自引:0,他引:16
随着全球数字图书馆的迅猛发展,互操作成为亟待解决的重要问题。OAI-PMH协议的制定为在元数据级别上设计实现一个统一、高效的互操作框架创造了条件。文章基于北京大学数字图书馆项目,详尽阐述了一个典型的支持OAI-PMH互操作体系结构的完整的设计与实现;不仅包括在理论上逻辑清晰的设计方案,在实现上也采用了比较成熟又兼具理论和应用前景的技术,如Java、DOM、XML、Oracle9i等。该文的工作为将来联合式数字图书馆这一发展方向做出了很好的尝试。 相似文献
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基于OAI的数字图书馆中元数据互操作框架 总被引:30,自引:1,他引:30
提出一种基于最新的元数据互操作协议———OAI的元数据互操作框架。文章给出了框架中各个组件的模块及功能说明,并说明各模块之间的交互。这种框架克服了以前人们所提出的其他集成方法过于复杂、难于实施的缺点。 相似文献
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基于元数据的网格应用系统研究 总被引:4,自引:0,他引:4
通过对网格环境下资源的描述方式的阐述,结合元数据的应用目的和多层次元数据结构的定义,提出了基于元数据网格资源定位的网格应用软件框架,并对网格应用框架的内容进行了分析,最后介绍了应用框架体系中元数据服务器的设计与实现。 相似文献
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Today there are many media sharing applications that use diverse metadata formats to describe media resources. This leads to interoperability issues in cataloguing, searching and annotation. This situation poses schema matching algorithms in the eye of the storm of metadata interoperability. In this paper we present two different solutions for multimedia metadata schema matching using variable linkage algorithms. These methods consist in directly comparing the data values stored in the different metadata variables, allowing to overcome the inherent limitations of schema-level matching approaches. We show the feasibility of these methods through some experiments with real metadata information extracted from the image hosting websites Deviantart, Flickr and Picasa. 相似文献
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Linn Marks Jeremy A.T. Hussell Tamara M. McMahon Richard E. Luce 《International Journal on Digital Libraries》2005,5(1):57-69
ActiveGraph is an information visualization tool designed to provide users with a concise, customizable view of objects in a digital library. A set of digital library objects is represented as a data set in a two- or three-dimensional scatter plot. The data set can represent any digital library objects in any medium: books, journals, papers, images, Web resources, or even entire databases. Since ActiveGraph is intended for use in the context of digital libraries, data attributes consist for the most part of metadata fields such as title, author, date of publication, and number of citations. Data attributes are mapped to six visual attributes of the scatter plot: the X-, Y-, and Z-axes, color, size, and shape. The metadata for a selected data point are displayed in a control panel on the right-hand side of the screen. Users can edit the metadata and even add new metadata fields. Thus ActiveGraph allows users to both view and customize the contents of a library. Because of its flexibility in handling digital library objects and metadata of different types, ActiveGraph can be used in a variety of digital library applications. In this paper, we describe two: LibGraph, which is a visualization of a collaborative library, and CiteGraph, which is a visualization of citation statistics. Both applications were designed for use by scientists and engineers, for whom scatter plots are familiar and intuitive visualizations. 相似文献
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Automatic evaluation of metadata quality in digital repositories 总被引:1,自引:0,他引:1
Owing to the recent developments in automatic metadata generation and interoperability between digital repositories, the production of metadata is now vastly surpassing manual quality control capabilities. Abandoning quality control altogether is problematic, because low-quality metadata compromise the effectiveness of services that repositories provide to their users. To address this problem, we present a set of scalable quality metrics for metadata based on the Bruce & Hillman framework for metadata quality control. We perform three experiments to evaluate our metrics: (1) the degree of correlation between the metrics and manual quality reviews, (2) the discriminatory power between metadata sets and (3) the usefulness of the metrics as low-quality filters. Through statistical analysis, we found that several metrics, especially Text Information Content, correlate well with human evaluation and that the average of all the metrics are roughly as effective as people to flag low-quality instances. The implications of this finding are discussed. Finally, we propose possible applications of the metrics to improve tools for the administration of digital repositories. 相似文献
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基于Internet的信息资源描述与交换方式 总被引:3,自引:0,他引:3
知识时代,人类越来越依赖于网络资源,人类的合作关系越来越紧密。基于元数据的描述与互操作正成为组织、交互网络资源的一种有效技术。通过对比数据结构,研究了元数据的本质与特点。介绍了都柏林核心元数据和修饰元数据。研究了资源描述框架RDF的数据模型和互操作特征。通过实例比较了都柏林元数据的HTML和RDF描述。最后介绍了基于CDF、PICS、OSD/DRP、DSig和EC/EDI等的信息资源交换方式。 相似文献