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为了把分布在不同系统中的数字信息资源整合起来,实现信息资源的统一检索、用户身份统一认证或计费功能,需要针对信息资源系统的不同环境,综合应用多种整合技术。将信息资源整合技术归纳为单点登录技术、WEB服务技术、跨库检索技术、元数据整合技术等,分别对这些技术的适用范围和面临的问题进行了详细的分析与比较,从而有助于信息服务机构在实施分布式数字信息资源共建共享服务平台时选择相应的整合技术。 相似文献
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发展铁道财会会计管理信息系统的构想 总被引：1，自引：0，他引：1
铁道财务会计管理信息系统是建立在广域网络环境下的分布式复杂大系统。实现全路范围的财务信息共享和综合利用，是铁路改革深入进行的保证。本文从总体设计方法、总体逻辑结构、分系统功能设计等方面论述了铁道财务会计管理信息系统的总体设计方案，充分考虑到了铁路体制改革的需求。此外，论文还 复杂大型管理信息系统的总体设计原则和策略。 相似文献
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针对当前电大在线教学平台的架构及功能在信息整合与共享性方面的不足,提出一个面向Web服务的分布式教学平台的架构和系统整体设计思想,并结合实践经验,阐述相关功能模块的设计思路,同时论述了该架构下信息整合和共享的具体实现方法。 相似文献
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物资供应公司采购电子商务系统是为积压、报废物资信息提供信息发布渠道,建立网上询、报价体系,实现与供应商信息互动和信息共享的平台。由于所有服务都是向公网提供的,用户也是通过公众网络访问采购电子商务系统的。因此,网站的安全尤为重要,为了保证用户的正当利益,采购电子商务系统使用动态口令方式为用户提供足够安全的登录方式,提高系统的安全等级。 相似文献
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为了达到文献资源统一管理,信息共享的目标,采用JSP＋Servlet技术,结合SQL Server2000数据库开发了基于Web的参考文献共享系统。该系统实现了文献资源的管理、检索和统计功能,具有较好的实用性。目前,该系统已经投入实际应用中。 相似文献
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How to merge and organise query results retrieved from different resources is one of the key issues in distributed information retrieval. Some previous research and experiments suggest that cluster-based document browsing is more effective than a single merged list. Cluster-based retrieval results presentation is based on the cluster hypothesis, which states that documents that cluster together have a similar relevance to a given query. However, while this hypothesis has been demonstrated to hold in classical information retrieval environments, it has never been fully tested in heterogeneous distributed information retrieval environments. Heterogeneous document representations, the presence of document duplicates, and disparate qualities of retrieval results, are major features of an heterogeneous distributed information retrieval environment that might disrupt the effectiveness of the cluster hypothesis. In this paper we report on an experimental investigation into the validity and effectiveness of the cluster hypothesis in highly heterogeneous distributed information retrieval environments. The results show that although clustering is affected by different retrieval results representations and quality, the cluster hypothesis still holds and that generating hierarchical clusters in highly heterogeneous distributed information retrieval environments is still a very effective way of presenting retrieval results to users. 相似文献
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Conventional information retrieval technology (i.e. VSM) faces many difficulties when being implemented in complex P2P systems for the lack of global statistic information (e.g. IDF) and central services. In this paper, we suggest a novel query optimization scheme (Semantic Dual Query Expansion, SDQE) that makes full use of the context information supplied by the local document collection. Latent Semantic Indexing (LSI) is used to explore the local context information. By comparing the different local context information hidden in different document collections, it is possible to solve the synonymy–polysemy problem in VSM. The experiments prove that our scheme is effective to improve the retrieval performance in P2P systems without knowing the global statistic information. 相似文献
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本文阐述了P2P技术，并就影响其发展的访问控制机制进行了分析，以求建立一个基于P2P网络的访问控制模式。 相似文献
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《Information processing & management》1986,22(3):243-250
This paper describes how the operations on the local inverted files are to be modified in order to use them in the distributed information retrieval system based on thesauri. The global system consists of n local retrieval systems. The presented retrieval rules may be viewed as the logical approach in implementing a physical distributed retrieval system. 相似文献