基于一种新的激励机制的P2P系统的UML建模

提出一种新的基于多代理的P2P系统激励机制,借助UML建模工具对一个基于该激励机制的P2P文件交换实例进行了公平性和效率分析,还对该激励机制涉及的安全的问题进行了分析.结论表明,该激励机制可以很好地解决系统资源共享的公平性和效率问题.     

具有位置感知和语义特征的P2P网络模型

 非结构化P2P网络中常用的泛洪搜索方法造成了严重的通信消耗.提出一种基于位置感知和语义的P2P网络模型,在覆盖网络的构建过程中考虑底层的物理网络拓扑,同时兼顾拓扑结构与共享资源之间的相关性.该网格模型基础上,给出了语义搜索算法.实验结果表明,提出的网络模型能够减少覆盖网络与底层物理网络拓扑不匹配带来的网络开销,并且在查找性能和网络开销之间取得了良好的平衡.     

P2P下载技术在嵌入式设备中的应用

嵌入式系统作为一种低功耗,微内核设备以及本身的硬件限制等各种特点,开发在一种具有下载功能的嵌入式设备很具有商业意义。传统的下载方式是节点和服务器之间交换信息,而P2P技术与传统的C/S方式有很大不同,它允许节点之间直接交换信息,很适合嵌入式系统之中。下本文通过对amule了进行移植,分析了交叉编译环境的搭建,嵌入式调试中的调试技术以及交叉编译过程中遇到的各种问题,成功实现了MIPS平台下的P2P文件共享技术,此外本文还用简洁的语言给出了一个完整的嵌入式开发流程。     

P4P：P2P的替代者

P2P网络的出现,成功地实现了可扩展的网络应用设计,并且已经成为一种新的范式。然而,P2P也面临着如何高效和公平地利用网络资源的挑战。特别是,缺乏明确地与网络供应商进行沟通,P2P的应用程序可能会消耗太多的带宽,使网络运营商负担不起,导致供应商采取很多限制P2P的措施。文章提出了一个简单,轻量的P4P结构,以便更有效地与网络供应商合作,最终更加高效地利用网络资源。     

Enforcing Cooperative Resource Sharing in Untrusted P2P Computing Environments

Peer-to-Peer (P2P) computing is widely recognized as a promising paradigm for building next generation distributed applications. However, the autonomous, heterogeneous, and decentralized nature of participating peers introduces the following challenge for resource sharing: how to make peers profitable in the untrusted P2P environment? To address the problem, we present a self-policing and distributed approach by combining two models: PET, a personalized trust model, and M-CUBE, a multiple-currency based economic model, to lay a foundation for resource sharing in untrusted P2P computing environments. PET is a flexible trust model that can adapt to different requirements, and provides the solid support for the currency management in M-CUBE. M-CUBE provides a novel self-policing and quality-aware framework for the sharing of multiple resources, including both homogeneous and heterogeneous resources. We evaluate the efficacy and performance of this approach in the context of a real application, a peer-to-peer Web server sharing. Our results show that our approach is flexible enough to adapt to different situations and effective to make the system profitable, especially for systems with large scale.     

非结构化P2P网络中稀缺资源的共享机制

非结构化P2P文件共享网络的应用日益广泛,当前的网络流量主要来自于此类网络中对各类文件资源的搜索。但是目前的搜索机制只适合获取流行资源,存在于个别节点上的稀缺资源很难被搜索到,而用户获取稀缺资源的收益并不小于流行资源,因此高效的搜索命中率将明显提高整个P2P网络的实用性。该文提出一种简单的分布式算法NLIR,使稀缺资源可以像流行资源一样具有较高的搜索命中率。新算法根据度数不同的节点,其处理查询的能力,存储能力,搜索命中率各不相同的特点将稀缺资源的索引副本均匀地扩散到网络中,体现了负载均衡的特性,并且在带宽费用和存储费用都有限的约束条件下,实现了稀缺资源高效的搜索命中率。     

基于信誉度的P2P反污染机制

文件污染是当前P2P文件共享系统普遍存在的问题,极大地影响了系统的可用性。文中提出一种基于资源和节点的信誉度的反污染机制——R＆amp;Ptrust,其中资源和节点的信誉度是全局计算的。R＆amp;Ptrust还包括隔离主动污染者的惩罚机制和激励被动污染者删除污染文件的激励机制。仿真结果表明,R＆amp;Ptrust能有效的隔离污染者并遏制污染文件的传播,具有良好的反污染性能。     

Real-Time Streaming Relay Mechanism for P2P Conferences on Hierarchical Overlay Networks

A peer-to-peer (P2P) multimedia conferencing service is operating that users share their resources to each other on the Internet. It can solve the problem in the centralized conferencing architecture, such as the centralized loading, single point error, and expensive infrastructure. However, P2P networks have the problem that a peer has a difference between the physical location and logical location in the overlay network. In the viewpoint of P2P networks, the nearest conference resource may be far away geographically. The P2P-session initiation protocol (P2P-SIP) multimedia conference is to construct an application-based logical multicast network efficiently according to physical network information. Thus, this paper proposes a real-time streaming relay mechanism for P2P conferences on hierarchical overlay networks. The real-time streaming relay mechanism can improve the transportation efficiency of conferencing stream exchange well based on the application-layer multicast (ALM) structure and the hierarchical overlay networks.     

P2P运营模式及P2P业务发展策略

目前主要P2P业务的运营模式主要有:Skype模式、广告模式、商贩模式、网格计算模式、电子商务模式。这些业务运营模式可以降低应用提供门槛,实现系统自激励机制,实现资费分担,增加用户"黏"度。未来,P2P的一个可能的方向是平台化,即形成一个基于P2P的资源交换平台,这个平台对用户进行抽象,对资源进行统一建模,并以一致的方式进行资源标识、注册、索引和搜索。用户之间的交互协议,可以采用标准的会话初始化协议(SIP)方式进行,实现标准化。交互接口可以按照可扩展标记语言(XML)的方式进行定义。不同的应用将基于这个平台构建不同的资源交换模型,并生成不同的应用逻辑。     

基于公钥认证的P2P多点数据传输系统

近年来,多点数据传输成为一个热门话题,广泛应用于各种P2P网络中。随着网络资源的共享越来越被强化,由于对等网络缺乏集中化的管理,安全性难以保证,多点数据传输系统的大规模商业应用所面临的安全问题越来越突出。针对P2P网络的安全问题,设计了一种公钥认证模式来识别用户身份,并实现了一个多点数据传输系统,该系统包括文件分块下载、即时聊天及音频／视频服务等常见应用。     

P2P流量识别与管理技术

P2P流量在推动Internet宽带化的同时也带来了资源过度占用和网络安全等问题.本文调查和研究了P2P流量识别和策略控制的最新技术及相关设备,总结出P2P流量综合控制模型,并指出进一步的研究方向.     

Research and Development of P2P Worms

With the development and the application of many popular peer-to-peer (P2P) systems such as eMule and BitTorrent,worms probably employ the features of these P2P networks to put them at risk.Some features,such as the local routing table and the application routing mechanism,are helpful to quickly distribute the P2P worms into the networks.This paper aims to give a comprehensive survey of P2P worms.The definition and the classification of P2P worms are discussed firstly.Then,the research and development of P2P worms, including experimental analysis,propagation modeling,and defensive approaches,are addressed and analyzed in detail.     

P2P与三网融合

随着互联网的迅猛发展,P2P技术在互联网上的应用超过了Web而成为在流量上占据统治地位的新型应用。同时,P2P技术的影响力不仅限于互联网,还间接地延伸到了电信网和广电网。使用P2P技术的新业务对传统领域带来冲击的同时,也协助解决了三网融合的技术瓶颈。ENUM技术作为跨越互联网和电信网的基础性架构,是融合网络的一条重要的技术途径。将ENUM技术与P2P相结合,可以使P2P共享的优势延伸到电信网络,加速网络融合。     

HPSIN: a new hybrid P2P spatial indexing network

Geographic information system(GIS)is increasingly managing very large sets of data,hence a centralized data index may not always provide the most scalable solution.Recently,the peer to peer(P2P)networks have become very popular for sharing information in a totally decentralized manner.In this paper,a new hybrid P2P spatial indexing network(HPSIN)is proposed,which combines distributed quad-tree with distributed Hash table(DHT)based Chord network to maintain both query efficiency and system load balance.In addition,a simple theoretical model based on opened queueing network for HPSIN is established.Assuming each peer as M/M/1 queueing processor in the model,fundamental characteristics of the system is captured,and expression of average query delay is obtained in close form.The theoretical analysis and numerical computing results show that there exists an optimum point of tradeoff between efficiency and load balance.By setting a proper value of start index level ls for different network scale and query rate,HPSIN will achieve the minimum overall query delay,therefore,can adapt to different P2P application environments.     

高速网络环境下的P2P流媒体业务分析和识别方法

The growing P2P streaming traffic brings a variety of problems and challenges to ISP networks and service providers.A P2P streaming traffic classification method based on sampling technology is presented in this paper.By analyzing traffic statistical features and network behavior of P2P streaming,a group of flow characteristics were found,which can make P2P streaming more recognizable among other applications.Attributes from Netflow and those proposed by us are compared in terms of classification accuracy,a...     

小型无线传感器网络的实现与P2P互联

传感器网络之间的互联与通信将成为未来无线传感器网络的应用模式之一,通过P2P技术互联多小传感器网络,奇为用户提供大规模、大范围、多样化的信息服务。在设计和实现基于SimplciTl协议的小型无线传感器网络的基础上,提出在无线传感器网络上的P2P覆盖,利用JXTA协议搭建P2P平台,实现了多个传感器网络以P2P的方式互联,并给出了硬件和软件的实现方案。     

Modeling and analysis of access transparency and scalability in P2P distributed systems

Peer‐to‐peer (P2P) systems have been developed with the goal of providing support for transparent and efficient sharing of scalable distributed resources wherein size scalability is limited by the costs of all types of transparencies, especially data access transparency, which are due to the need for frequent data exchanges between peers and other related communication overheads. We present a model that formulates the relationship between scalability and data access transparency in P2P distributed systems to figure out how large these systems can be scaled up, given the overheads of establishing data access transparency. To validate our model and show how our model can be deployed in real life, we consider a real P2P distributed system as a case study and evaluate how CPU utilization, bandwidth, and data request frequency parameters of our model relate to the amount of effort required by the system management to establish data access transparency. We then calculate the strength of the coefficient of correlation of scalability and data access transparency in the system. The degree of strength of this coefficient allows the system designer to decide at design time whether to allow the use of the model in the management of system at runtime or not. Copyright © 2012 John Wiley & Sons, Ltd.     

用于协同工作的分组P2P网络

传统的协作系统存在固有的缺陷:系统可靠性和扩展性差,不能充分利用客户端资源。P2P系统不但架构灵活,有高可扩展性,而且能充分利用计算和网络资源。文章分析了协同工作系统采用P2P架构所具有的优点,并提出一个用于协同工作系统的分组P2P网络的设计与实现方案。     

面向运营商的P2P流媒体系统架构

针对现有流媒体系统存在的主要问题,本文提出了一种面向电信运营商的可运营、可管理、可扩展的P2P流媒体系统架构,并给出了该架构下流媒体点播业务的实现流程以及主要的资源调度和管理流程.该系统的建立可有效解决困扰业界已久的内容盗版、用户收费、质量保障等关键问题,协助P2P流媒体确立自身盈利模式.     

移动对等网络数据检索新方法研究

移动对等网络中的信息共享和数据检索是一个具有挑战性的问题。文章基于一种新的缓存策略．提出了一种移动对等环境下的数据检索的新方法，称为移动对等网络的区域缓存机制，并给出了算法实现。该策略可以有效的支持大规模移动对等网络的数据检索。