共查询到19条相似文献,搜索用时 125 毫秒
1.
2.
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
3.
在对现流行的互操作协议的发展和特征进行比较分析的基础上,介绍了基于P2P搜索方法的特点及分类.最后在原有OAI-PMH框架的基础上,提出一种基于P2P技术的数字图书馆分布式搜索模型 (P2P-DL) ,并对系统实现的关键技术进行了分析与设计. 相似文献
4.
5.
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
6.
7.
数字图书馆建设中如何实现元数据的互操作是数字图书馆中元数据组织所面临的主要问题。对元数据互操作方法进行分析,指出元数据映射方法的不足,建议采用基于XML/RDF的标准描述方法解决数字图书馆中元数据互操作的问题。重点研究基于XML/RDF的MARC格式的描述。从而解决传统MARC格式在数字图书馆中应用的问题。这对目前广大图书馆中现存的大量的MARC数据在数字图书馆中的应用具有重要意义。 相似文献
8.
针对数字图书馆服务器有时会出现异常停止的问题,设计并实现了一个保证数字图书馆服务器实现无人职守、不间断地运行的看门狗系统,并成功运用在重庆师范大学图书馆的数字图书馆服务器上。 相似文献
9.
论文从图书馆目前面临的挑战开始,提出数字图书馆(DigitalLibraries,简称DLs)互操作的必要性,然后分析实现互操作的要点及其面临的难题。文章简要介绍了面向服务体系结构(Service-OrientedArchitecture,简称SOA)的概念和特点,详细阐述了基于SOA的DLs互操作开放框架,并用XML和WebServices实现了主要组件。 相似文献
10.
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
11.
构建数字城市的元数据服务体系 总被引:1,自引:0,他引:1
Metadata is one of the six key technologies of Digital Earth,which is also an important aspect in buildingand implementing the Digital City. Based on the technologies and standards of Web Services ,the author came up witha metadata services architecture in the distributed heterogeneous network environment of Digital City. In this paper,the metadata services architecture is described and explained in detail,including the related standards,technologies,and the practical experiences in the ‘Metadata Sharing Network Project of Digital Beijing‘ as well. It also points out that, based on the Web service ,to build the metadata service architecture will be practically meaningful for organizing,managing and sharing the information resources in Digital City. 相似文献
12.
13.
14.
DM_OLAP元数据管理 总被引:3,自引:0,他引:3
元数据在数据仓库和联机分析处理中扮演着重要的角色。该文介绍了自主研制的DM_OLAP系统的元数据模型,包括其设计和CWM标准化.同时,提出了基于CWM模型的DM_OLAP元数据管理系统的设计。 相似文献
15.
16.
17.
In this paper, we propose a role-based access control (RBAC) system for data resources in the Storage Resource Broker (SRB).
The SRB is a Data Grid management system, which can integrate heterogeneous data resources of virtual organizations (VOs).
The SRB stores the access control information of individual users in the Metadata Catalog (MCAT) database. However, because
of the specific MCAT schema structure, this information can only be used by the SRB applications. If VOs also have many non-SRB
applications, each with its own storage format for user access control information, it creates a scalability problem with
regard to administration. To solve this problem, we developed a RBAC system with Shibboleth, which is an attribute authorization
service currently being used in many Grid environments. Thus, the administration overhead is reduced because the role privileges
of individual users are now managed by Shibboleth, not by MCAT or applications. In addition, access control policies need
to be specified and managed across multiple VOs. For the specification of access control policies, we used the Core and Hierarchical
RBAC profile of the eXtensible Access Control Markup Language (XACML); and for distributed administration of those policies,
we used the Object, Metadata and Artifacts Registry (OMAR). OMAR is based on the e-business eXtensible Markup Language (ebXML)
registry specifications developed to achieve interoperable registries and repositories. Our RBAC system provides scalable
and fine-grain access control and allows privacy protection. Performance analysis shows that our system adds only a small
overhead to the existing security infrastructure of the SRB. 相似文献
18.
Semantic interoperability is a crucial element to make building information models understandable and model data sharable across multiple design disciplines and heterogeneous computer systems. This paper presents a new approach and its software implementation for the development of building design objects with semantics of interoperable information to support semantic interoperability in building designs. The novelty of the approach includes its incorporation of building design domain ontology, object-based CAD information modeling, and interoperability standard to make building information models and model data semantically interoperable. A set of methods are proposed to address the issues of object-based building information representation compliant with the Industrial Foundation Classes (IFC); extension of IFC models with the supplementary information; and semantic annotation of the interoperable and extensible information sets. The prototype implementation of these methods provides a set of Web-enabled software tools for effectively generating, managing, and reusing the semantically interoperable building objects in design applications of architectural CAD, structural analysis, and building code conformance checking. 相似文献
19.
DU Lin 《电脑编程技巧与维护》2008,(14)
在数字信号处理领域中,无限脉冲响应数字滤波器(IIR)和有限脉冲响应数字滤波器(FIR)占有极其重要的地位。但是,IIR数字滤波器存在诸如稳定性难以保障以及相位的非线性等一些固有缺点,这使得具有线性相位等优点的FIR数字滤波器得到很好的发展。本文介绍基于MATLAB的约束最小二乘法FIR数字滤波器设计。包括约束最小二乘法基本原理和FIR数字滤波器设计思想以及相关MATLAB程序语言,并介绍MATLAB的SPTooL滤波器设计器及其应用。 相似文献