首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 46 毫秒
1.
P2P作为一种与服务器/客户端对立的网络架构,其应用近些年来在互联网中发展十分迅速,新的P2P应用更是层出不穷.分析P2P网络内容分发中心化时流媒体服务器之间的数据传输,指出它们的优缺点,结合CDN和P2P关键技术在网络中的应用,提出了轻量级的P2P传输系统,对网络流量、资源分块和分段大小的控制,提高资源查找的效率,从而简化P2P资源的查找实现  相似文献   

2.
传统流媒体平台对服务器性能,网络带宽等条件要求较高,对校园网的视频应用服务有一定的局限性。为解决此问题,设计了一种基于P2P架构的流媒体视频教学平台,将流媒体技术的实时性和P2P网络的分布性完美地结合起来,实现了视频直播和点播功能。  相似文献   

3.
随着网络及流媒体技术的发展,越来越多的远程教育系统开始采用流媒体作为主要的网络教学方式.它可以提高网络课堂的质量,增强网络课堂的交互性.而基于P2P的流媒体可以充分发挥众多客户机的作用,有效利用客户机闲置的计算和存储资源,使客户机完成部分服务器的功能,降低服务器的负载和对网络带宽的占用率.因此,基于P2P的流媒体技术在远程教育中的应用已成为一种必然的趋势.在传统流媒体技术的基础上提出混合式结构的P2P流媒体模式,以进一步优化远程教育系统.  相似文献   

4.
Deadline-aware network coding for video on demand service over P2P networks   总被引:10,自引:0,他引:10  
INTRODUCTION With the widespread deployment of broadband access, Video-on-Demand (VoD) streaming on the Internet has received increasing attention recently. In VoD service, video streams are delivered to asyn- chronous users with low delay and VCR-like opera- tion support (e.g., pause, fast-forward, and rewind). However, streaming to a large population of clients is very challenging due to the limited server capacity and little deployment of IP multicast in today’s Internet (Quinn a…  相似文献   

5.
如何高效地在P2P网络上搜索到资源,依赖于对网络上资源的高效索引和查找方法。本文在分析、研究P2P网络基本搜索方法的基础上,改进了泛洪请求模型搜索方法,并将其应用到企业内部网络资源搜索中,以达到更合理的利用和共享企业内部网络信息资源的目的。  相似文献   

6.
研究了应用层组播的P2P流媒体传输技术,给出了应用层组播树的结构,使得树的结构能够保证用户计算机不互相传送同样的数据而形成数据风暴.  相似文献   

7.
基于C/S模式的网络外语教学系统由于过分依赖于服务器,难以突破带宽与服务器性能的瓶颈,有着诸多难以克服的缺陷,而基于P2P技术的网络系统能够充分利用所有在线节点的带宽与硬件资源,便捷地实现流媒体直播以及学生间、学生和教师间、教师间的在线交流和资源共享,弥补传统教学网站的不足,极大地改善了在线外语教学效果,为网络外语教学开拓了一个全新的领域。  相似文献   

8.
传统流媒体系统,受带宽和服务器限制,难以支持大规模并发客户。针对该问题,介绍了当前用P2P技术实现流媒体系统的现状,探讨了P2P的流媒体系统的系统结构及关键技术,分析了存在的问题,最后指出了P2P流媒体系统发展的研究方向。  相似文献   

9.
在网络中搜索各种资源时,通用的搜索引擎很难满足用户特定的需求。P2P网络是一种有效的资源共享和搜索方式。通过分析P2P网络的基本结构和资源共享特点,提出了一种基于P2P的资源网络模型(PBRN)。PBRN是由各资源实体"自组织"形成的分布式、虚拟、动态和松散的纯P2P网络,并实例化的剖析了它在教育信息资源上的应用。  相似文献   

10.
在VOIP中引入P2P技术,可以有效缓解资源有限的难题,改善网络的可伸缩性和可靠性。本文即是在VOIP与P2P结合考面做了有益的尝试,提出了基于混合P2P结构的VOIP模型,详细论述了模型中节点的操作,并对其服务质量(QoS)进行了研究,结合VC算法提出了一个带抖动控制的算法(VC-Jitter算法)。最后对提出的系统进行了仿真实验,结果分析表明本文所提模型和算法是有效的。  相似文献   

11.
P2P systems are categorized into tree-based and mesh-based systems according to their topologies. Mesh-based systems are considered more suitable for large-scale Internet applications, but require optimization on latency issue. This paper proposes a content subscribing mechanism (CSM) to eliminate unnecessary time delays during data relaying. A node can send content data to its neighbors as soon as it receives the data segment. No additional time is taken during the interactive stages prior to data segment transmission of streaming content. CSM consists of three steps. First, every node records its historical segments latency, and adopts gamma distribution, which possesses powerful expression ability, to express latency statistics. Second, a node predicts subscribing success ratio of every neighbor by comparing the gamma distribution parameters of the node and its neighbors before selecting a neighbor node to subscribe a data segment. The above steps would not increase latency as they are executed before the data segments are ready at the neighbor nodes. Finally, the node, which was subscribed to, sends the subscribed data segment to the subscriber immediately when it has the data segment. Experiments show that CSM significantly reduces the content data transmission latency.  相似文献   

12.
P2P技术的出现,使低成本的分布式服务成为可能。参与的用户既是服务的消费者,又是服务的提供者,这种特性尤其适合流媒体系统。P2P技术将集中的流媒体服务分散化,从而消除了传统系统的瓶颈,拓展了网络视频业务的应用范围。  相似文献   

13.
INTRODUCTION Multimedia services over the Internet are be- coming popular due to the widespread deployment of broadband access. However, the conventional cli- ent-server architecture severely limits the number of simultaneous users, especially for bandwidth inten- sive applications such as video streaming. P2P net- works, on the other hand, offer a solution to the scalability problem. As a node joins a P2P network, it not only consumes resources but also contributes its bandwidth or comp…  相似文献   

14.
近年来,随着电子商务平台的蓬勃发展,民间借贷开始衍生出一种新的模式——P2P网络借贷,其中,以宜信模式为主的P2P网络借贷平台在网络借贷中已成为最主要的模式之一。进化博弈分析显示,健全的信用和法律体系对于P2P网络借贷尤为重要。加快P2P网贷平台建设,需建立起完善的监管制度和个人信用评价体系,强化网贷公司自身安全管理与风险控制,并在合理范围内适当提高网贷利率。  相似文献   

15.
大规模ad hoc网络下的高效的主动RSA方案   总被引:1,自引:0,他引:1  
A previous proactive RSA scheme for large-scale ad hoc network has been shown to be faulty. In this paper, we present a new proactive RSA scheme for ad hoc networks, which includes four protocols: the initial key distribution protocol, the share refreshing protocol, the share distribution protocol, and the signature generation protocol. This scheme has two advantages: the building blocks are secure, and the system is efficient.  相似文献   

16.
基于语义叠加网的对等网搜索机制   总被引:1,自引:0,他引:1  
针对目前超结点叠加网络研究中的不足,将语义信息引入到超节点的组织过程中,提出了一种新的对等网搜索模型———SSP2P.模型中结点依据小世界理论在物理上形成自然的区域自治系统(AAS),各AAS依据幂规律选取各域内的超结点,超结点再根据语义关系形成多个超结点语义网(SSN),从而形成一个层次化的超结点叠加网络模型.实验结果表明:该模型在保证系统扩展性的基础上有效地提高了搜索效率,减少了通信开销.证明在超节点叠加网络的构建过程中语义信息的引入有利于对等网搜索性能的提高.  相似文献   

17.
协同缓存通过多个代理缓存的协同工作,以提高缓存命中率,均衡网络和服务器负载,提高访问速度。P2P的结构使得网络富有延展性,在分布式计算中也有巨大的潜力。3G网络的部署和更多WIFI手持设备的投放,Ad hoc网络技术将有更关阔的应用空间。本文对基于无线移动网络的协同缓存技术进行了归纳分析,并提出了在基于Ad hoc网络的移动P2P系统协同缓存应用技术面临的问题和解决预期。  相似文献   

18.
结合我国目前网络带宽的特点和教学的实际需求,应用JMF软件和流媒体相关技术,采用P2P+C/S模式,开发了1个多人音视频辅导平台,解决了音视频网络传输时的带宽资源占用,音视频同步控制,用户及流媒体管理等关键问题,使师生可以进行在线音视频同步交流和讨论,提高了学生学习的兴趣和质量,满足了教学的实际需求。  相似文献   

19.
P2P技术的发展引发了Internet应用模式的研究。为了寻求网络运营商、内容提供商和互联网用户三方共赢的解决方法,P2P文件共享的方便和耗费带宽一直成为人们关注的话题。从传统主动、被动测量方法入手进行了系统的比较研究,借用国外在两种测量的融合上提出优化P2P网络新的理论思想,并从小波分解的角度对这一理论进行量化分析,指出其中存在的问题。  相似文献   

20.
A P2P streaming service architecture with distributed caching   总被引:3,自引:1,他引:3  
Multimedia streaming served through peer-to-peer (P2P) networks is booming nowadays. However, the end-to-end streaming quality is generally unstable due to the variability of the state of serve-peers. On the other hand, proxy caching is a bandwidth-efficient scheme for streaming over the Internet, whereas it is a substantially expensive method needing dedicated powerful proxy servers. In this paper, we present a P2P cooperative streaming architecture combined with the advantages of both P2P networks and multimedia proxy caching techniques to improve the streaming quality of participating clients. In this frame- work, a client will simultaneously retrieve contents from the server and other peers that have viewed and cached the same title before. In the meantime, the client will also selectively cache the aggregated video content so as to serve still future clients. The associate protocol to facilitate the multi-path streaming and a distributed utility-based partial caching scheme are detailedly dis- cussed. We demonstrate the effectiveness of this proposed architecture through extensive simulation experiments on large, Inter- net-like topologies.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号