【正文】 畢業(yè)論文（設(shè)計(jì)）外文翻譯 題 目： 基于 C++局域網(wǎng)聊天系統(tǒng) 學(xué) 院： 數(shù)理與信息學(xué)院 學(xué)生姓名： 專 業(yè)： 計(jì)算機(jī)科學(xué)與技術(shù) 班 級： A07 計(jì)算機(jī) 指導(dǎo)教師： 起 止 日期： 至 2020 年 4 月 6 日 1 Paper1 P2P trust model Summary of the P2P work problems are analyzed, described the establishment of P2P work trust model work on the existing trust models are summarized, pointing out the direction of future research. Introduction With the Inter39。s widespread popularity, the rich end user39。s system resources, as well as the rapid increase in work bandwidth, the traditional Client / Server Network Application Mode server performance bottlenecks 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 P2P works to work together, distributed information sharing, largescale parallel puting such as showing the unique advantages of the new development to make it hot. P2P works 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 , such individuals to provide resources for the public, and node behavior result in unconstrained mode of P2P work there are three problems. (1) ride (FreeRiding) problem FreeRriding consumption of other nodes that node only contribution to the resources without sharing their own Gnutella P2P file sharing system, for example, 70% of the nodes is the latest monitoring also shows that in the eDonkey filesharing work, about 80% of the nodes is the FreeRider. (2) Public Goods and sorrow (the Tragedy of the Commons) problem Public Goods and sorrow means the work resources as a nonexclusive public resources are most uncontrolled use of P2P nodes, according to statistics, P2P traffic accounted for 60% of Inter Zong traffic flow, and the user is not the total number of significant growthcases, P2P traffic is still growing fact, P2P work users of its fundamental purpose is rational to maximize their utility, but does not consider the work39。s overall effectiveness. 2 (3) not reliable services, and fraud P2P work, there are a large number of unreliable service quality, and the many filesharing application, for example, 25% of the documents were forged documents (Faked Files).This is similar to eBay in emerce, 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 works to address these three issues, to improve the availability of P2P services to promote effective collaboration node and the rational use of work resources. Why is the trust model Nodes that have their own rights, selforganizing P2P work, how to regulate the behavior of the node? In fact, P2P works provide realworld work environment of human munication, humancentered works, and social works with the same trust as an integral part of social existence, is the social work in the core of relations between society, reputationbased trust relationship with the incentive mechanism to restrict people39。s daily P2P work and the similarity of human social works embodied in the P2P work 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 that individuals can tolerate a small amount of damage caused by the wrong choice, such as filesharing application。 individual obligation to the work to provide remended information to other , we can describe P2P works using the trust relationship between nodes, and to take trustbased incentive mechanisms to address these issues. (1) to provide differentiated services based on trust values In file sharing P2P work, nodes on the work resources according to the contribution level, to provide differentiated example, Kazaa nodes provide the resources 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 nodes upload rate under each other to determine their own upload work node in accordance with the request of local trust values to set the node in the download queue priority. 3 Malicious use of work resources on the node to example, proposed incentives RTBMa focus on the Gnutella work file transfer type when the bandwidth allocation problem, according to the contribution of the node on the work for distribution of bandwidth a node share data, contribute to stimulate nodes to increase share the node from the node overload to download a file, contribution to reducing the value of the node to suppress the consumption of public resources. Differentiated services based incentives to encourage cooperation between nodes, and the rational use of work resources, in order to address freeriding and the tragedy of public goods problem. (2) According to the trust value of node selection service provider Node can be based on trust values to choose to trade with each example, in the eBay work, high trust value to buy the products business, which encourage businesses to maintain good sales practices and improve reliability of inhibit the P2P work is not reliable services, and fraud. The concept of trust Trust is a multidisciplinary concept, describes specific situations, an individual may have adverse consequences in the circumstances, want to believe that another individual has some ability to plete a task or a subjective contact with the concept of trust the credibility of credit from the individual39。s social work, is based on observed past b