基于移动代理的P2P应用研究

发布时间：2018-03-29 03:34

本文选题：P2P技术　切入点：移动代理　出处：《苏州大学》2014年硕士论文

【摘要】：自从1999年Napster软件出现以后，P2P技术以其强大的支持网络的可扩展性而迅速受到广大研究者的关注。从2000年开始，，学术界持续关注P2P技术并进行了深入研究。到2007年，P2P技术的主要问题和核心机制等都基本得到解决，广大研究者达成共识，对P2P下一步的研究重点应转向如何利用P2P技术满足不同的应用以最大限度地发挥P2P技术的优点。根据研究现状和已有的研究方法，本文首先给出了一种支持模糊查询的P2P网络模型AS-Chord。为了充分利用节点的异质性，AS-Chord将网络节点划分成两类。通过结合移动代理，AS-Chord中每个能力相对较强的节点存储一类资源索引，从而支持了模糊查询。另外，本文还给出了一种基于PULL模型的分布式求解流媒体最大传输速率方法。该方法使用平均带宽分配和上传邻居随机选择算法，首先进行模型分析，然后通过MATLAB实验求解出在任意流媒体网络节点选择不同个数上传邻居进行上传带宽请求时，节点得到的上传带宽小于期望得到的上传带宽的概率，从而根据要求确定任意节点选择上传邻居的个数。最后通过模拟实验统计了相关网络参数并给出了基于移动代理的改进方案。该方案在很大程度上提升了流媒体最大传输速率，同时保持了较小的上传邻居选择个数。模拟实验结果表明，一方面AS-Chord中的移动代理可有效地将资源索引放置到合适的超级节点上，使得同一个超级节点上的资源索引相似。另一方面，在求解流媒体最大传输速率时，移动代理可有效地帮助上传带宽冗余的节点和获取上传带宽较少的节点建立连接，提升后者得到的上传带宽，从而提升流媒体最大传输速率。因此，结合移动代理和P2P技术的优点，可在某些特定方面提升分布式应用的性能。
[Abstract]:Since the emergence of Napster software in 1999, P2P technology has attracted the attention of researchers because of its strong scalability. By 2007, the main problems and core mechanisms of P2P technology had been basically solved, and the majority of researchers reached a consensus. The next step of P2P research should focus on how to use P2P technology to meet different applications in order to maximize the advantages of P2P technology. According to the current research situation and existing research methods, This paper presents a P2P network model AS-Chord. in order to make full use of the heterogeneity of nodes, AS-Chord divides the network nodes into two categories. In order to store a class of resource indexes by combining each node with relatively strong capability in mobile agent AS-Chord, this paper presents a P2P network model named AS-Chord-Chord, which supports fuzzy query, in order to make full use of the heterogeneity of nodes. In addition, this paper presents a distributed method based on PULL model to solve the maximum transmission rate of streaming media. This method uses the average bandwidth allocation and upload neighbor random selection algorithm to analyze the model at first. Then the MATLAB experiment is used to solve the probability that when any streaming media network node selects different number of upload neighbors to request the upload bandwidth, the upload bandwidth obtained by the node is less than the expected upload bandwidth. According to the requirement, the number of uploading neighbors of any node is determined. Finally, the related network parameters are counted through simulation experiments and an improved scheme based on mobile agent is given. This scheme improves the maximum transmission rate of streaming media to a great extent. At the same time, the number of uploading neighbors is kept small. The simulation results show that, on the one hand, the mobile agent in AS-Chord can effectively place the resource index on the appropriate super node, which makes the resource index on the same super node similar. In solving the maximum transmission rate of streaming media, the mobile agent can effectively help the nodes with redundant upload bandwidth and those nodes with less upload bandwidth to establish connections and enhance the upload bandwidth obtained by the latter. Therefore, combining the advantages of mobile agent and P2P technology, we can improve the performance of distributed applications in some specific aspects.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.02

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