共查询到20条相似文献,搜索用时 15 毫秒
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Web服务中,为了消除和抑制节点的不良行为,鼓励提供可靠服务的良好行为,建立有效的可信保证机制,提出了一种新的基于群组的信任模型。该模型考虑了节点的经验个性化和群组行为个性化等问题,分析表明:新模型降低了全局信誉求解的规模,提高其计算的效率;一定程度上解决了大规模分布式网络中访问稀疏的问题;同时具有一定的激励性和鲁棒性。 相似文献
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Review on Computational Trust and Reputation Models 总被引:17,自引:1,他引:16
The scientific research in the area of computational mechanisms for trust and reputation in virtual societies is a recent discipline oriented to increase the reliability and performance of electronic communities. Computer science has moved from the paradigm of isolated machines to the paradigm of networks and distributed computing. Likewise, artificial intelligence is quickly moving from the paradigm of isolated and non-situated intelligence to the paradigm of situated, social and collective intelligence. The new paradigm of the so called intelligent or autonomous agents and multi-agent systems (MAS) together with the spectacular emergence of the information society technologies (specially reflected by the popularization of electronic commerce) are responsible for the increasing interest on trust and reputation mechanisms applied to electronic societies. This review wants to offer a panoramic view on current computational trust and reputation models. 相似文献
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Web服务中的信任和声誉评估模型 总被引:1,自引:0,他引:1
对主观逻辑存在的一些问题进行分析和改进,并进一步提出一个基于主观逻辑的自适应Web服务信任模型iWSTrust。通过利用iWSTrust对Web服务环境的交易过程所涉及的实体间的各种信任关系进行详细的建模和推理,并区分不同类型的服务请求者,iWSTrust能够使实体的信任度和声誉随着交易经验的增加而自适应地改变,预测实体的未来行为,并对恶意欺骗的实体进行惩罚,从而更好地保护服务请求者和服务提供者的利益。模拟实验表明改进的主观逻辑能更好地建模信任关系和改善Web服务环境的安全性。 相似文献
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通过分析目前电子商务信任模型的研究现状,总结出了研究基于声望的信任模型的主要方法,讨论了信任研究中所涉及的各种问题,并给出了目前声望式信任管理研究面临的挑战以及下一步的研究方向. 相似文献
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All trust management systems must take into account the possibility of error: of misplaced trust. Therefore, regardless of whether it uses reputation or not, is centralized or distributed, a trust management system must be evaluated with consideration for the consequences of misplaced or abused trust. Thus, the issue of fairness has always been implicitly considered in the design and evaluation of trust management systems. This paper attempts to show that an implicit consideration, using the utilitarian paradigm of maximizing the sum of agents' utilities, is insufficient. Two case studies presented in the paper concern the design of a new reputation systems that uses implicit and emphasized negative feedbacks, and the evaluation of reputation systems' robustness to discrimination. The case studies demonstrate that considering fairness explicitly leads to different trust management system design and evaluation. Trust management systems can realize a goal of system fairness, identified with distributional fairness of agents' utilities. The realization of this goal can be achieved in a laboratory setting when all other factors that affect utilities can be excluded, and where the system can be tested using modeled adversaries. Taking the fairness of agent behavior explicitly into account when building trust or distrust can help to realize the goal of fairness of trust management systems. 相似文献
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一种基于与或图的语义Web服务自动组合方法研究 总被引:1,自引:0,他引:1
单个Web服务提供的功能有限,服务组合成为Web服务应用的一个重要研究方向。提出了一种基于与或图的语义服务自动组合方法。该方法为Web服务引入语义,能将服务搜索空间受限于服务组合与或图中,并能从服务组合与或图中选出最佳组合图,从而达到优化服务组合的目的。仿真实验证明,该方法提高了Web服务组合的成功率和效率。 相似文献
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一种对等网中基于相互信任的两层信任模型 总被引:3,自引:1,他引:3
在P2P 系统中,声誉模型是建立节点间信任关系的重要方法之一,但现有的P2P 声誉模型几乎都是纯分散式的,具有信任收敛慢、信任管理复杂和网络开销大等缺点.在TLT(two-level trust)中,节点自发组织为信任簇,信任评价以簇为单位.每个簇由簇首和成员节点组成,簇首和成员节点之间是一种相互信任的关系:簇首为了提高自身的簇间服务信任,利用簇内服务信任观察成员节点的服务性能,过滤恶意的成员节点;成员节点为了提高服务声誉和接受更好的服务,利用代理信任考察簇首的管理能力.分析和仿真结果表明:在TLT 中,节点的信任值收敛快,恶意行为能够被快速识别;TLT 可扩展性好,如信任管理简单和网络开销小. 相似文献
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信任管理作为网格研究的核心内容,受到研究人员的高度关注。目前设计的模型中,实体域的信任值由直接信任值和推荐信任值合成,但引入推荐信任就必须对网格域进行层次划分。现有的划分方法只是主观地根据网格域之间的交易情况来划分层次,这种划分方式得到的推荐值的可靠性难以保证,并且不能防止联合欺骗的行为。基于对网格实体域行为的深入研究,给出了一个基于实体域行为的直接信任值动态量化模型,在此基础上,引入匹配指标和粗糙度的概念,给出了一个层次划分模型,利用该模型很好地解决了推荐信任值的计算问题,给出了一个信任评估模型,理论分析和实验结果表明,该模型能够保证推荐信任值的可靠性,并且防止了推荐过程中的联合欺骗,有效地解决了网格环境中信任评估问题。 相似文献
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The increasing number of service providers on the Web makes it challenging to select a provider for a specific service demand. Each service consumer has different expectations for a given service in different contexts, so the selection process should be consumer-oriented and context-dependent. Current approaches for service selection typically have consumers receive ratings of providers from other consumers, where the ratings reflect the consumers' overall subjective opinions. This may be misleading if consumers have different contexts and satisfaction criteria. In this paper, we propose that consumers objectively record their experiences, using an ontology to capture subtle details. This can then be interpreted by consumers according to their own criteria and contexts. We then integrate a method for addressing consumers who lie about their experiences, filtering them out during service selection. We demonstrate the value of our approach through experiments comparing our model with three recent rating-based service selection models. Our experiments show that using the proposed approach, service consumers can select the service providers for their needs more accurately even if the consumers have different criteria, they change the contexts of their service demands over time, or a significant portion of them are liars. 相似文献
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随着Web服务的出现,对软件服务和服务组合的安全可靠的运行使得服务提供方、服务请求方以及代理之间的相互信任变得尤为重要。首先给出信任和声誉的定义以及它们之间的区别和联系,由此提出一个用于度量软件服务间信任关系的信誉评估模型——WSTR。给出了更加灵活的计算直接信任度方法,并且将声誉引入推荐信任的合成中,利用现有的节点作为声誉存储实体,更加能够体现信任的主观性和客观性的结合。仿真结果表明声誉度能够客观地反映出真实的实际情况。 相似文献