排序方式: 共有20条查询结果,搜索用时 15 毫秒
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In adaptive channel allocation for secondary user(SU) of cognitive radio(CR) system,it is necessary to consider allocation process from the temporal perspective.In this article,a chain store game is modeled to achieve SU's equilibrium state.Due to the computational complexity of solving equilibrium states,the authors explore the correlated equilibrium(CE) by importing signal mechanisms based on time and sequence number.Also,correlated equilibrium based game algorithms are presented.Simulations show that the... 相似文献
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In adaptive channel allocation for secondary user (SU) of cognitive radio (CR) system, it is necessary to consider allocation process from the temporal perspective. In this article, a chain store game is modeled to achieve SU's equilibrium state. Due to the computational complexity of solving equilibrium states, the authors explore the correlated equilibrium (CE) by importing signal mechanisms based on time and sequence number. Also, correlated equilibrium based game algorithms are presented. Simulations show that these algorithms are superior to other allocation algorithms both in channel utilization and communication time. 相似文献
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相关反馈技术是一种较常用的提高信息检索精度的方法.在图像检索领域,相关反馈技术被认为是解决图像高层语义内容和低层视觉特征之间差异的一种有效方法.视觉特征的权值调整是一类应用较多的相关反馈技术,权值调整方法中存在矩阵奇异问题,本文提出了一种新的基于散布矩阵分析的相关反馈算法,解决了矩阵奇异问题.该方法通过分析与检索目标相关图像在特征空间中的散布来构造目标图像类的投影空间,该空间对应于一个高层语义类在特征空间中分布密集的子空间,在投影空间中计算相似图像;同时根据每次反馈的信息不断修正投影空间来提高系统的检索性能.在Cord图像数据库中的实验结果表明该算法具有良好的检索性能. 相似文献
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A second order isoparametric finite element method (IPFEM) is proposed for elliptic interface problems. It yields better accuracy than some existing second-order methods, when the coefficients or the flux across the immersed curved interface is discontinuous. Based on an initial Cartesian mesh, a mesh optimization strategy is presented by employing curved boundary elements at the interface, and an incomplete quadratic finite element space is constructed on the optimized mesh. It turns out that the number of curved boundary elements is far less than that of the straight one, and the total degree of freedom is almost the same as the uniform Cartesian mesh. Numerical examples with simple and complicated geometrical interfaces demonstrate the efficiency of the proposed method. 相似文献
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基于情感模型的感性图像检索 总被引:16,自引:0,他引:16
感性信息处理是让计算机能够模仿和识别用户的情绪、感觉和感情,实现和谐的人机交互,达到“以人为本”。通常人们用一些形容词来表达自己的情绪,本文提出了一种情感模型用来处理这些表达心理的形容词,从心理学的“维量”思想出发,采用语义量化技术和因子分析的方法建立情感空间,并分析情感空间的相似性度量方式;抽取图像的颜色和形状特征作为图像的感性特征,采用径向基函数神经网络将图像由特征空间映射到情感空间,在情感空间内实现图像的感性检索,取得了较好地实验结果。 相似文献