移动代理电子商务环境下基于声誉的多维度信任算法研究
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摘要
网络技术的迅猛发展带来了电子商务的广泛应用,其年交易额不断增长,交易者双方的不确定性对交易成败的影响也越发凸显出来。为了减小网络实体间不确定性带来的信任缺失对电子商务发展的不利影响,对信任算法的研究应运而生。信任算法通过量化信任,达到预测对方可靠程度的目的,能在一定程度上起到保障电子商务安全的作用。
     通过对已有基于移动Agent的电子商务系统的广泛研究和分析,提出了一种基于声誉的信任网络建模方法和信任网络简化步骤。该建模方法能清晰的体现网络中的信任实体及其之间的信任关系,简化步骤能过滤网络中的冗余信息帮助有利于信任计算的功能性参数如最优推荐传播路径等凸显出来。
     在信任网络建模的基础之上,提出了一种基于声誉的多维度信任算法Rep-MDTrust。Rep-MDTrust依据从信任网络建模抽象出的功能性参数,给出了一种新的推荐可信度计算方法,并运用置信因子综合直接信任和推荐信任来对网络内的节点进行信任评估。通过将多维度机制引入交易评价体系和权重体系,Rep-MDTrust较好的体现了个体偏好、风险态度等主观因素对信任计算的影响,提高了信任算法在交易单个属性上的敏感性。时间衰减函数为Rep-MDTrust引入了一定的奖惩机制并实现了信任的动态衰减。
     通过仿真实验对所提出信任算法的有效性分析,证明了Rep-MDTrust在体现节点主观偏好、风险态度以及实现信任度的动态衰减方面都有着良好的表现。最后,在Windows XP环境下,采用Java语言,利用MyEclipse开发工具,实现了该信任算法。
E-commerce systems, which have gained lots of attention for its conveniences, are applied far-ranging recent years. While its’annual turnover soaring prominently, uncertainty among entities harm on-line transactions greatly. Research on trust algorithm in e-commence system is proposed to pre-evaluate whether an entity is creditable enough to trade with. Hotspots on this field are trust attributes analysis and trust evaluation algorithm. Significant attributes of trust have enjoyed a wide consensus and lots of trust models have been proposed in various network environments according to previous researches. Based on these researches and by analyzing steps for trust evaluation in mobile agent-based network, major contribution of this thesis includes:
     A way of depicting trust network based on trust entities’roles and relationships among them is introduced. Then simplification steps were carried out to get ride of redundancy. This method helps functional information be picked and emphasized so that they can be used in trust evaluation directly.
     Based on parameters abstracted from trust network depicting process, a reputation-based multi-dimensional trust algorithm, Rep-MDTrust is proposed. Rep-MDTrust provides a new way to calculate reliability of recommender, and calculate entity’s trustworthiness by integrating direct trust and reference trust together. Multi-dimensional system for opinions of trade and weight of these opinions helps subjective factors be reflected in trust evaluation, and makes the algorithm more sensitive to selected attributes which are considered to be more influential than the others. In addition, dynamic attributes of trust is reflected by trustworthiness damped function. This function not only lets trustworthiness of a target agent damp when there are no fresh transactions between a source agent and the target, but also works as a rewards and punishment system.
     Experiments for Rep-MDTrust have been made on simulation system. Results show that Rep-MDTrust’s have a favorable performance on individual predilection, risk attitude distinguishing. And damped function can adjust variation trend of trustworthiness properly. In the end, application background for Rep-MDTrust is introduced and the whole algorithm is programmed using Java in MyEclipse platform.
引文
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