中文摘要：

在结合网格与P2P网络技术优势的基础上，提出一种在网格环境下基于P2P技术的覆盖网络构建机制．该机制对传统的P2P网络资源管理协议Chord进行改进，并根据节点对系统贡献的大小决定其资源管理的权限，实现大规模网格中不同虚拟组织间异构资源的整合，旨在进行有效的资源管理，消除集中式的网格环境下单点失效和系统性能瓶颈的问题．实验结果表明，该机制在使得网格系统获得良好性能的同时，也保持了P2P网络的动态性与网络规模的可缩放性．

英文摘要：

Based on the advantages of both Grid and peer-to-peer （P2P） networks, an overlay network in the Grid environment is constructed by P2P technologies by a modified version of the Chord protocol. In this mechanism, different nodes＇ accesses to different resources are determined by their contribution. Therefore, the heterogeneous resources of virtual organizations in large-scale Grid can be effectively integrated, and the key node failure as well as system bottleneck in the traditional Grid environment is eliminated. The experimental results indicate that this management mechanism can achieve better average performance in the Grid environment and maintain the P2P characteristics as well.