共查询到20条相似文献,搜索用时 15 毫秒
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在众多不确定因素很强的数据中,如何挖掘数据是非常重要的,这时候关联规则挖掘理论就出现了.因此,在数据挖掘的领域中,关联规则有着突出的研究地位.本文从关联规则的产生背景和相关概念做出了论述. 相似文献
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In this letter,on the basis of Frequent Pattern(FP) tree,the support function to update FP-tree is introduced,then an incremental FP(IFP) algorithm for mining association rules is proposed.IFP algorithm considers not only adding new data into the database but also reducing old data from the database.Furthermore,it can predigest five cases to three case .The algorithm proposed in this letter can avoid generating lots of candidate items,and it is high efficient. 相似文献
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无线传感器网络中一种改进的分布式加权多维尺度定位算法 总被引:1,自引:0,他引:1
本文在无线传感器网络单跳定位误差分析的基础上,分析了多跳节点定位误差的特性,并据此提出针对分布式加权多维尺度定位(Distributed Weighted Multidimensional Scaling,dwMDS)的权值优化算法.在无法获知参考点确切误差的情况下,利用分析出来的克拉美劳下限代替参考点误差并与距离测量误差合并,更准确的反映了多跳定位中的点与点之间的误差,从而有助于设计更优化的权值.仿真结果表明,使用优化权值改进的算法得到的节点定位误差明显减小. 相似文献
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A distributed optimal one-level routing algorithm is presented. The algorithm is based on Newton's method. Using the variable reduction method, the Hessian matrix becomes diagonal. An example shows that the algorithm has a much faster convergence rate, more accurate results, and better transient behavior than previous work. The algorithm is shown to be convergent, stable, robust, and loop free 相似文献
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A routing strategy called NELHNET has been developed for networks with multiprecedence traffic and operating under dynamic traffic and topological conditions. An adaptive distributed algorithm that uses least-hop and least-hop-plus-1 routes in a table of routing vectors, as opposed to the usual table of routing scalars, is described. Current delays are passed backward and forward with the packets to allow development of expected delays to each node via all acceptable routes. The route then selected is the acceptable route with the least expected delay. For speedier recovery, a node returning to service receives the current network status from an adjoining node as soon as the link connecting them is operational. The resultant algorithms show far greater than the marginal improvements originally expected over Arpanet simulations. NELHENET strategies also permit the network to function stably under more heavily loaded conditions than do the Arpanet strategies 相似文献
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为了有效提高分布式传感器网络中航迹与航迹关联的计算速度,本文提出了一种新的基于临时航迹和信源相对可信度的多源模糊航迹关联算法。该算法首先在全局融合中心利用来自同一局部融合节点的同一航迹的两个量测形成临时航迹,再由临时航迹与系统航迹融合生成系统航迹,航迹关联是在临时航迹与系统航迹间进行的;并引入信源相对可信度,当有多条临时航迹与系统航迹关联时,选取信源相对可信度最大的临时航迹与系统航迹关联。将该算法用于一个多源航迹关联的仿真实验中,仿真结果表明该算法在保证关联正确率的前提下,与传统的模糊航迹关联算法相比,进一步提高了航迹关联的计算速度和系统航迹的精度,是一种有效的多源航迹关联方法。 相似文献
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The effects of a periodicity interruption (phase slip) in distributed feedback lasers are investigated with attention given to the practical aspects of today's semiconductor lasers in the 1.5 μm region. We find that effects on gain threshold and mode discrimination should be large and favorable if the size and placement of a phase slip are correct. 相似文献
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针对渐进式关联规则挖掘问题提出了一个有效的处理算法,即IDM—A算法。它能根据数据库的动态变化,高效地进行关联规则的更新。通过知识数据库的维护,最多只需要扫描原始数据库一次,就能得到所需的频繁项目集,能有效地降低更新关联规则所需的时间成本。 相似文献
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基于关联规则Web日志挖掘算法的研究 总被引:1,自引:0,他引:1
根据Web日志挖掘的特点,介绍了Web数据挖掘的分类和过程.将关联规则应用到日志挖掘算法中,并利用云理论对关联规则算法进行优化,使之更能符合人的思维方式. 相似文献
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针对自动从文档中导出关键词/词条之间的关联性问题,在研究加权挖掘算法和向量空间模型中权值特点的基础上,提出了一种新的矩阵加权关联规则挖掘算法。 相似文献