共查询到17条相似文献,搜索用时 109 毫秒
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对不精确、不完整信息系统的决策规则,证据理论提供了一种卓有成效的处理方法.从应用的角度出发,人们提出了修正的证据推理组合规则.为了能对各种证据推理组合规则有深刻理解,以证据理论为基础,对各种组合规则进行了深入的研究,分析了不同情况下各证据组合规则解决冲突问题的能力.接着给出了一种基于证据的条件概率指派合成方法,并证明了其有效性.最后,对各种证据组合规则的适用范围进行了比较. 相似文献
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Dempster-Shafer(D-S)证据理论在不确定性信息处理相关领域具有十分重要的地位,然而对冲突证据进行Dempster规则组合时,常常会出现反直观结果的问题.本文提出了一种新的对证据组合结果质量评价的量化标准,该标准由证据集可信度与组合结果聚焦度构成,并在该标准的基础上提出了一种对证据进行多次试探折扣的修正方法,每次试探折扣由证据的不从属度来构造,实现了证据集可信度与组合结果聚焦度的共同提高,获得最佳聚焦结果,并且还可以通过设置优化目标,灵活控制证据集可信度,获得高质量证据组合结果,以满足各种类型决策的需要.实验结果和相关分析表明,本文方法是合理有效的. 相似文献
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针对冲突证据的组合问题,提出了一种新的证据组合方法。通过定义证据间的Jaccard相似度获得各个证据的归一化可信度,在此基础上获得一个标准证据。利用该标准证据对各初始证据进行修正,最后利用Dempster-Shafer(DS)组合规则获得证据组合结果。证据组合过程中既保持了DS规则良好的数学性质,又有效地减小了冲突证据带来的干扰,提高了组合结果的合理性与可靠性。 相似文献
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D-S证据理论在多传感器信息融合中的改进 总被引:4,自引:0,他引:4
详细阐明了多传感器信息融合的一种方法——D-S证据理论,他是一种处理不确定性问题的有用方法,但是D-S证据理论组合规则的一些不足影响证据理论的应用,通过深入分析,针对该方法的不足提出了一种修正的组合方法,这样不仅能够用于组合冲突比较大的证据,而且能够根据各条证据所包含的不同信息量进行自适应加权组合,改进了基本D-S证据理论的组合准则,提高了其融合性能,并通过实例证明了该方法的有效性。 相似文献
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基于信任度和虚假度的证据组合方法 总被引:1,自引:0,他引:1
D-S证据理论在信息融合领域有着广泛的应用,但使用Dempster组合规则对高冲突证据进行合成时可能会得到反直观的结果,在应用中也存在“一票否决”的问题,为解决这些问题,提出一种改进的基于证据信任度和虚假度的证据加权组合方法。首先在证据相关系数的基础上定义了证据信任度,再结合证据虚假度的概念来确定各原始证据的权重,依此权重系数对各证据进行加权平均后利用Dempster组合规则对加权平均证据进行组合。数值算例表明,该组合方法可实现冲突证据的有效融合,与其他方法相比该方法具有更好的收敛性。 相似文献
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To overcome the invalidation problem of Dempster rule with high conflict,a weighted combination method based on degree of credibility and certainty was proposed.Firstly,the cosine similarity was modified to hold the ability to measure the evidence conflict when multi-subset focal elements were included,followed by the building of evidence credibility model.Secondly,the evidence certainty model based on precision and entropy was presented,which can both reflect the evidence’s degree of multi-subset focal elements and the dispersion degree of probability assignment.Then the weighted coefficient was determined by credibility and certainty.Finally,the normalized weighted coefficient was used to average the basic probability assignment,and the final combination result can be obtained according to Dempster rule.Numerical examples show that,compared with other traditional weighted combination methods,the proposed approach has made better performance in reducing conflict and accelerating convergence. 相似文献
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To deal with the shortcomings encountered when using the existing similarity/dissimilarity measures to quantify evidence conflict,a new dissimilarity measure called power-Pignistic probability distance was defined.Furthermore,a weighted evidence combination method was proposed based on power-Pignistic probability distance.The conflict degree between two pieces of evidence was quantified by the power-Pignistic probability distance.After that,a similarity measure matrix was constructed,based on which the credibility of evidence was obtained.Then the weighted average method was used to revise the evidence.Finally,the fusion was accomplished by using Dempster’s rule.The results of the numerical examples show the efficiency and rationality of the proposed method. 相似文献
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对D-S证据论进行了分析,揭示了它存在的问题及其原因。指出,证据论是不可信的。首先列举了证据论应用中出现的种种怪异表现,如证据合成结果有时与人的主观判断有很大差别、合成结果不稳定等。其次对证据论的核心理论进行了剖析,找到了问题的根源,即:在利用Dempster证据合成公式进行证据合成时,以及在利用概率质量计算信任区间时,将辨识框架幂集中各元之间的相互独立性破坏了。这样做不仅导致了上述怪异现象,而且直接动摇了证据论的理论根基,使它不具有可信性。最后,将证据论与概率推理进行了比较,并表明证据论的问题可以在概率推理的框架下得到简明的解决。 相似文献
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The situation of high conflict between evidences and one ballot veto cannot be solved by classical D-S rule,and the results obtained from classical D-S rule are contrary to the facts.To solve this problem,a new standard to measure conflicts between evidences was proposed based on the combination of Pignistic function transformation and correlation coefficient,and also a novel kind of weighted combination method which was applied to measure conflicts between evidences was put forward according to the standard.After that,a support matrix was constructed based from which the credibility of evidence was obtained,and the weighted average method was used to revise the evidence.Finally,the combination was accomplished by using Dempster’s rule.The result of numerical examples shows that it’s effective to solve the combination of conflicting evidence.Compared with other methods,the proposed method has good astringency. 相似文献