中文摘要：

信息中心网络（CCN）是一种全新的网络架构,其显著的特点是处处缓存,合理的内容缓存部署能够显著提高网络传输效率。缓存替换策略是缓存管理中的重要组成部分,合理地进行缓存内容的替换,成为影响网络整体性能的关键。考虑到内容自身的特性,设计了一种基于节点缓存命中贡献率的贪婪双倍命中（GDH）缓存替换方案。该方案综合考虑了内容的请求次数、传输代价、缓存代价,设计全新的多目标价值函数,用于评估内容的缓存价值,当缓存空间不足时,替换掉价值最小的内容,实现节点缓存内容价值的最大化。仿真结果表明,该替换算法提高了节点的命中率,降低了获取内容的平均跳数。

英文摘要：

Content-centric networking（ CCN） is a new network architecture. Its salient feature is caching everywhere. Deploying content caching reasonably can significantly improve the efficiency of network trans-mission. Caching replacement is an important part of caching management. A reasonable caching replace-ment scheme becomes an important factor of improving the quality of network. Considering the characteris-tics of content,this paper designs a new caching replacement scheme named GDH（Greedy-Dual-Hit） based on caching hit ratio of node. The number of requests,transmission cost and caching cost are taken into account to construct a new multiple-value function. The function can be used to evaluate the caching value of content. Cached content with the minimal value of multiple-value function is replaced for maximi-zing caching profit when the caching space is full. The simulation results show that the node hit rate is in-creased and the average hops of obtaining content is cut down.