1、 毕业论文（设计）外文翻译 题 目： 基于 C+局域网聊天系统 学 院： 数理与信息学院 学生姓名： 专 业： 计算机科学与技术 班 级： A07 计算机 指导教师： 起 止 日期： 2011.3.29 至 2011.6.18 2011 年 4 月 6 日 1 Paper1 P2P trust model Summary of the P2P network problems are analyzed, described the establishment of P2P network trust model needs.P2P network on the existing trust m
2、odels are summarized, pointing out the direction of future research. Introduction With the Internets widespread popularity, the rich end users system resources, as well as the rapid increase in network bandwidth, the traditional Client / Server Network Application Mode server performance bottlenecks
3、 and single point of failure issue is not only limited the full use of end system resources,also increasingly unable to meet the new distributed applications.The P2P networks to work together, distributed information sharing, large-scale parallel computing such as showing the unique advantages of th
4、e new development to make it hot. P2P networks are willing to share resources on the node the basic assumption that each node share its own resources and from other nodes where the resources for their own needs.However, such individuals to provide resources for the public, and node behavior result i
5、n unconstrained mode of P2P network there are three problems. (1) ride (Free-Riding) problem Free-Rriding consumption of other nodes that node only contribution to the resources without sharing their own resources.To Gnutella P2P file sharing system, for example, 70% of the nodes is the Free-Rider.T
6、he latest monitoring also shows that in the eDonkey file-sharing network, about 80% of the nodes is the Free-Rider. (2) Public Goods and sorrow (the Tragedy of the Commons) problem Public Goods and sorrow means the network resources as a non-exclusive public resources are most uncontrolled use of P2
7、P nodes, according to statistics, P2P traffic accounted for 60% of Internet Zong traffic flow, and the user is not the total number of significant growthcases, P2P traffic is still growing rapidly.In fact, P2P network users of its fundamental purpose is rational to maximize their utility, but does n
8、ot consider the networks overall effectiveness. 2 (3) not reliable services, and fraud P2P network, there are a large number of unreliable service quality, and fraud.To the many file-sharing application, for example, 25% of the documents were forged documents (Faked Files).This is similar to eBay in
9、 e-commerce, this is not a reliable service and fraud to the user impact is more serious. Therefore, effective mechanisms must be designed to regulate the behavior of nodes in P2P networks to address these three issues, to improve the availability of P2P services to promote effective collaboration n
10、ode and the rational use of network resources. Why is the trust model Nodes that have their own rights, self-organizing P2P network, how to regulate the behavior of the node? In fact, P2P networks provide real-world network environment of human communication, human-centered networks, and social netw
11、orks with the same configurationsex.The trust as an integral part of social existence, is the social network in the core of relations between people.Human society, reputation-based trust relationship with the incentive mechanism to restrict peoples daily behavior.Trust-based P2P network and the simi
12、larity of human social networks embodied in the P2P network between individuals interact with each other for each other left sporadic credit information； individual objects on the interaction with the full right to choose； individuals are often not the absolute valuereliability or quality of service
13、 that individuals can tolerate a small amount of damage caused by the wrong choice, such as file-sharing application； individual obligation to the network to provide recommended information to other individuals.Therefore, we can describe P2P networks using the trust relationship between nodes, and t
14、o take trust-based incentive mechanisms to address these issues. (1) to provide differentiated services based on trust values In file sharing P2P network, nodes on the network resources according to the contribution level, to provide differentiated services.For example, Kazaa nodes provide the resou
15、rces and the ratio of consumption of resources into the system as a node in the level of participation and access to services as a priority of the node.BitTorrent nodes upload rate under each other to determine their own upload rate.EDonkey network node in accordance with the request of local trust values to set the node in the download queue priority.
