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中文摘要：
VoD业务是当今互联网上广泛流行的业务,人们通过在线浏览自己喜爱的新闻、娱乐、电影等视频剪辑,但在互联网上开展VoD业务仍是一项艰巨的挑战,这主要是因为海量的媒体数据存储和高额的带宽消耗以及需要高性能的服务运算能力所带来的巨额开销。P2P-VoD的出现无疑给人们带来了从根本上解决问题的希望,它通过将数据分储在每个参与的节点上,对每个业务的使用者通过一些策略使其同时成为业务的提供者。现在的Internet上已经部署了一些可以使用的P2P-VoD系统,但是这些系统仍然普遍存在播放启动时延较大和系统负载均衡较差等诸多问题。文中提出的方案试图解决和优化以上遇到的问题。试验结果数据表明,该方案能够有效改善播放的启动时延（减少为原来的1/2）和具有良好的系统负载均衡效果。
英文摘要：
Nowadays,the VoD service is widly popular on the Internet,pepople glance over video clips of news,entertainment,film on the line.It is still an arduous challenge to deploy VoD service on the Internet,since the magnanimous media data storage and the high quota band width consumed as well as the large amount expenses needed which the high performance the service operational capability brought.No doubt that P2P-VoD＇s appearance would bring hope that fundamentally solved the question,movies are split into chunks that can be storaged at partners,each service＇s consumer is the service＇s provider simultaneously by some strategies.On present＇s Internet had already deployed some P2P-VoD systems,but these systems still generally had seriously playback startup latency and low load balancing,etc.The paper proposed attempts to solve and optimize the meets.The results show that our mechanism is effective in suppressing the playback startup latency（drops to original 1/2） and reducing the wokload of P2P-VoD system.
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