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如何利用具有本体标注的结构化文档中的语义信息组织P2P网络,提供对基于语义的信息共享与查询的P2P网络支持,是当前P2P网络的研究热点之一.本文提出采用Peer所存储文档中的加权本体概念向量作为Peer的特征向量,通过相似度计算将Peer聚成Peer组,从而构造基于语义的半结构化P2P网络.用户的查询请求由各Peer组内的组服务器负责路由转发,组服务器计算查询请求与各路由表项之间的相似度,将查询向最有可能包含查询目标的Peer组转发.文中较全面地阐述了本体概念局部和全局权重的计算方法.由于P2P网络拓扑的建立过程和查询路由过程均基于语义信息,使得网络的各项性能与基于关键字处理的P2P网络相比,得到了较大的提高. 相似文献
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TaChord:利用拓扑相关路由算法和超级节点的Chord系统 总被引：7，自引：0，他引：7
由于未考虑实际网络拓扑结构,当前结构化对等网络系统存在高延迟低效率的毛病. 本文提出一种与实际网络拓扑结构相关的路由方法,并开发出一种基于Chord的TaChord系统. 在仿真系统中, 用物理跳数、域间延迟和每个消息占用的带宽来衡量TaChord和其他系统的路由性能. 仿真结果表明,TaChord系统的路由性能有了极大的提高, 如平均物理跳数是Chord的一半,并且不同路由缓存管理策略对TaChord的路由性能能产生重要的影响. 相似文献
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Although the Internet is largely decentralized in its communication and social patterns, its technical and regulatory apparatuses are highly centralized and hierarchical. Consequently, digital communications are vulnerable to a degree of surveillance and censorship that would be unthinkable in traditional social arenas, threatening “Internet freedom” and cyberliberties in both democratic and politically repressed societies. We believe a new architecture is required in order to protect the continuance of civil liberties in networked society. In this article, we propose 10 “social specifications” describing the requirements of such a network, and outline an architecture called MondoNet that meets these specifications using ad hoc, wireless mesh networking technologies. We also address the legal and technical challenges facing the MondoNet project, and anticipate future developments in this field. 相似文献
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垃圾邮件已成为当今邮件系统的主要问题,垃圾邮件发送者通过伪装邮件来逃避反垃圾邮件系统的检测.针对目前的垃圾邮件过滤器大多数单机运行,所能获得的数据和信息较少,效率较低的问题,本文提出了一个点对点(P2P)的无服务器的E-mail系统的体系结构,系统测试结果表明,该系统结构有效地实现了相似邮件的聚集,从而达到了过滤垃圾邮件的目的. 相似文献
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Valerie Brett Martina Mullally Bill O'Gorman Nerys Fuller-Love 《Action Learning: Research and Practice》2012,9(2):125-143
Developing sustainable learning networks for entrepreneurs is the core objective of the Sustainable Learning Networks in Ireland and Wales (SLNIW) project. One research team drawn from the Centre for Enterprise Development and Regional Economy at Waterford Institute of Technology and the School of Management and Business from Aberystwyth University has contributed to the understanding of how to create sustainable business learning networks for entrepreneurs. The research findings are attributed to action research by the conduction of two separate cycles in the forum of research projects. The first cycle, called Female Entrepreneurs in Ireland and Wales, produced findings that were reflected on and investigated further by the research team through the establishment of the second cycle named SLNIW. This paper discusses the two action research cycles through the action sets of planning, action, observing and reflecting and the contribution of the development of understanding and practice of networking for entrepreneurs through the production of guidelines for establishing sustainable learning networks. 相似文献
6.
Torrey Trust 《Journal of Research on Technology in Education》2017,49(1-2):16-30
Educators around the world participate in virtual communities, social media sites, and online networks in order to gain support and ideas for improving their practice. Many researchers have explored how and why teachers participate in these online spaces; however, there is limited research on how participation might impact teaching and learning. This study was designed to examine how K–12 teachers' participation in the Edmodo math subject community, an informal online space for educators, shaped their learning and practice. Data were collected through an online survey of 150 participants and in-depth, follow-up interviews with 10 participants. Three themes emerged from the participants' responses: motivation, empowerment, and innovation. The participants were motivated to spend time learning how to improve their practice, they felt empowered to make changes to their practice, and they believed they were able to adopt innovative, student-centered practices. Implications and ideas for further research are discussed. 相似文献
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由于P2P网络中存在大量欺诈行为、攻击和不可靠的服务,使服务质量无法得以较好的保证。文章介绍了p2p网络时间向量,然后利用混沌加密技术对时间向量构建数字序列,通过数字序列构成数字指纹来使通信双方建立信任;仿真实验表明:新模型较传统的模型能更有效的识别出具有复杂策略的节点,在抵御恶意节点的各种动态行为上有更好的性能。 相似文献
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基于语义叠加网的对等网搜索机制 总被引：1，自引：0，他引：1
针对目前超结点叠加网络研究中的不足,将语义信息引入到超节点的组织过程中,提出了一种新的对等网搜索模型———SSP2P.模型中结点依据小世界理论在物理上形成自然的区域自治系统(AAS),各AAS依据幂规律选取各域内的超结点,超结点再根据语义关系形成多个超结点语义网(SSN),从而形成一个层次化的超结点叠加网络模型.实验结果表明:该模型在保证系统扩展性的基础上有效地提高了搜索效率,减少了通信开销.证明在超节点叠加网络的构建过程中语义信息的引入有利于对等网搜索性能的提高. 相似文献
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首先对IPX协议结构进行了分析,在此基础上,论述了利用IPX协议实现数据通信的工作原理,最后以一个实例说明IPX协议在数据通信中的应用. 相似文献
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