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中文摘要：
如何高效地搜索资源是P2P网络中最为关键的问题。非结构化的对等网络，一般以广播方式作为其搜索的基本策略，引发较大的网络流量，因此，提出改进的搜索策略，包括把节点划分为拥有丰富资源的核心节点和稀疏资源的边缘节点，并为每个节点引入朋友节点，模拟测试表明改进算法稳定有效，降低了网络开销。
英文摘要：
How to search the resources efficiently is the key problem in peer-to-peer networks. Unstructured peer-to-peer networks usually use broadcasting as its basic search strategy and cause a larger network flows. This paper intro- duces some improved search approaches, including dividing nodes into two types： kernel-nodes with more resources and edge-nodes with less resources, and introducing friend-nodes to each peer. Simulation results show that improved methods enhance the search efficiency and reduce the network costs.
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