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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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在目前流行的结构化的对等网络技术中,存在稳定性较差、路由延迟较长、吞吐率较低等不足。为提高网络的稳定性和减少路由延迟,文中针对网络结点的会话异构性、物理邻接性、访问局部性,提出了相应的设计方案。为提高网络的吞吐率,做好系统的拥塞控制,文中采用消息比特来注明网络的拥塞情况。 相似文献
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姜涛 《西安体育学院学报》2004,(Z1)
间歇性低氧训练(Intermittent hypoxic training or Interval hypoxic training,IHT)是近年来快速发展的一种科 学辅助训练方法,通过对间歇性低氧训练方法的产生、发展及其应用的研究和间歇性低氧训练与其它低氧训练方法的比 较研究,将间歇性低氧训练与其它仿高原训练在理论上加以区分,以推动间歇性低氧训练的顺利开展。 相似文献
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JIANG Jun-jie TANG Fei-long PAN Feng WANG Wei-nong 《浙江大学学报(A卷英文版)》2006,7(6):945-951
INTRODUCTION Peer-to-peer computing has become a populardistributed computing paradigm. Efficient resourcelookup is essential for such systems. As we know, most of the deployed peer-to-peersystems are unstructured. Napster is based on a cen-tral directory and was in popular use during early daysSoon after, Gnutella and KaZaA were deployedwidely. However, all these popular unstructuredpeer-to-peer systems suffer from unscalability. Fortunately, there are new kinds of peer-to-peernetwor… 相似文献
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曹建 《苏州市职业大学学报》2012,23(3):42-45
通过对CHORD算法的详细研究和分析,结合DHT全分布式P2P网络的结构要求,给出了一种基于CHORD环的DHT全分布式P2P网络算法,并给出了基础算法的伪代码. 相似文献
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Peer-to-peer (P2P) systems are now very popular. Current P2P systems are broadly of two kinds, structured and unstructured. The tree structured P2P systems used technologies such as distributed hash tables (DHT) and hierarchical clustering can search the required target quickly, however, in a tree, the internal node has a higher load and its leave or crash often causes a large population of its offspring's problems, so that in the highly dynamic Internet environment the tree structure may still suffer frequent breaks. On the other hand, most widely used unstructured P2P networks rely on central directory servers or massive message flooding, clearly not scalable. So, we consider both of the above systems' advantages and disadvantages and realize that in the P2P systems one node may fail easily, but that when a number of nodes organized as a set, which we call "super node", the set is robust. Super nodes can be created and updated aware of topology-aware, and used with simple protocol such as flooding or "servers" to exchange information. Furthermore the entire robust super node can be organized into exquisite tree structure. By using this overlay network architecture, P2P systems are robust, efficient, scalable and secure. The simulation results demonstrated that our architecture greatly reduces the alteration time of the structure while decreasing the average delay time, compared to the common tree structure. 相似文献