共查询到18条相似文献,搜索用时 109 毫秒
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介绍了BP及RBF神经网络的基本理论,阐述了这两类算法的基本原理,其后从理论上对二者的性能进行了比较,最后在MATLAB环境下对具体的实例进行了仿真,结果表明RBF网络的泛化能力在多方面都优于BP网络,但是在解决具有相同精度要求的问题时,BP网络的结构要比RBF网络简单,因此,在应用中可以以此来指导神经网络的设计。 相似文献
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基于RBF网络的商品混凝土强度预测分析 总被引:4,自引:0,他引:4
提出具有9个输入节点, 1个输出节点的 RBF神经网络模型来模拟抗压强度及其影响因素之间复杂非线性关系.作为对比,作者同时比较了3种不同输入模型的RBF网络的预测效果并与传统的BP网络模型进行比较,结果表明,文章提出的RBF网络模型具有很高的预测精度和较强的泛化能力,可作为商品混凝土性能分析的一种新型有效的方法. 相似文献
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径向基函数(RBF)网络在入侵检测中的应用 总被引:3,自引:0,他引:3
近年来,BP神经网络因为技术成熟在入侵检测中得到了若干应用,但是其本身所具有的局部极小性质限制了检测性能的提高。针对RBF神经网络所具有的最优逼近性质,对其在入侵检测中的应用作了研究。实验证明,RBF网络能够提高入侵检测性能。 相似文献
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引出了当人工神经网络算法解决结构工程实践问题时,网络结构本身所面临缺陷。描述了人工神经网络和遗传算法的概念,以及二者的长处和关系,从理论和实例上说明了运用遗传算法优化和改进神经网络结构可行性,从而结合二者的长处解决工程实践问题。详细阐述了如何利用遗传算法优化或改进BP网络模型和RBF网络模型,以及如何利用遗传优化BP网络和遗传优化RBF网络模型分析结构损伤,从而比较遗传BP网络和RBF网络在结构损伤分析方面的性能。 相似文献
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引出了当人工神经网络算法解决结构工程实践问题时,网络结构本身所面临缺陷.描述了人工神经网络和遗传算法的概念,以及二者的长处和关系,从理论和实例上说明了运用遗传算法优化和改进神经网络结构可行性,从而结合二者的长处解决工程实践问题.详细阐述了如何利用遗传算法优化或改进BP网络模型和RBF网络模型,以及如何利用遗传优化BP网络和遗传优化RBF网络模型分析结构损伤,从而比较遗传BP网络和RBF网络在结构损伤分析方面的性能. 相似文献
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结合聚类思想神经网络文本分类技术研究* 总被引:1,自引:0,他引:1
针对传统的基于神经网络文本分类算法收敛速度慢等缺点,在分析了文本分类系统的一般模型,以及在应用了互信息量的特征提取方法提取特征项后,提出了一种基于样本中心的径向基神经网络文本分类算法;并引入了聚类算法的核心思想,改进误差反向传播神经网络分类算法收敛速度较慢的缺点。实验结果表明,提出的改进算法与传统的BP神经网络分类算法相比,具有较高的运算速度和较强的非线性映射能力,在收敛速度和准确程度上也有更好的分类效果。 相似文献
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一种新型模糊-粗神经网络及其在元音识别中的应用 总被引:1,自引:0,他引:1
为度量模糊粗不确定性信息,引入了模糊粗隶属函数.基于模糊粗糙集理论构建了一种新型的模糊,粗神经网络(FRNN),该网络融合了模糊信息和粗糙信息的处理能力.对5个元音字母的语音识别进行测试,结果显示FRNN网络不仅训练速度快,而且分类性能优于BP网络、RBF网络和贝叶斯分类器. 相似文献
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基于免疫RBF神经网络的语音情感识别 总被引:2,自引:1,他引:1
本文针对语音情感识别中BP神经网络收敛速度慢和正确率低的问题,提出了一种训练径向基函数(RBF)网络的混合算法。在语音情感特征提取的基础上,采用免疫RBF神经网络进行情感识别,同时还训练了一个BP网络进行对比实验,得到了比较理想的识别结果。 相似文献
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Osman H. Fahmy M.M. 《IEEE transactions on systems, man, and cybernetics. Part B, Cybernetics》1997,27(3):488-497
Recent research has linked backpropagation (BP) and radial basis function (RBF) network classifiers, trained by minimizing the standard mean square error (MSE), to two main topics in statistical pattern recognition (SPR), namely the Bayes decision theory and discriminant analysis. However, so far, the establishment of these links has resulted in only a few practical applications for training, using, and evaluating these classifiers. The paper aims at providing more of these applications. It first illustrates that while training a linear output BP network, the explicit utilization of the network discriminant capability leads to an improvement in its classification performance. Then, for linear output BP and RBF networks, the paper defines a new generalization measure that provides information about the closeness of the network classification performance to the optimal performance. The estimation procedure of this measure is described and its use as an efficient criterion for terminating the learning algorithm and choosing the network topology is explained. The paper finally proposes an upper bound on the number of hidden units needed by an RBF network classifier to achieve an arbitrary value of the minimized MSE. Experimental results are presented to validate all proposed applications. 相似文献
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This paper describes a new method for the classification of binary document images as textual or nontextual data blocks using neural network models. Binary document images are first segmented into blocks by the constrained run-length algorithm (CRLA). The component-labeling procedure is used to label the resulting blocks. The features for each block, calculated from the coordinates of its extremities, are then fed into the input layer of a neural network for classification. Four neural networks were considered, and they include back propagation (BP), radial basis functions (RBF), probabilistic neural network (PNN), and Kohonen's self-organizing feature maps (SOFMs). The performance and behavior of these neural network models are analyzed and compared in terms of training times, memory requirements, and classification accuracy. The experiments carried out on a variety of medical journals show the feasibility of using the neural network approach for textual block classification and indicate that in terms of both accuracy and training time RBF should be preferred. 相似文献
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This article presents the hardware implementation of the floating-point processor (FPP) to develop the radial basis function (RBF) neural network for the general purpose of pattern recognition and nonlinear control. The floating-point processor is designed on a field programmable gate array (FPGA) chip to execute nonlinear functions required in the parallel calculation of the back-propagation algorithm. Internal weights of the RBF network are updated by the online learning back-propagation algorithm. The on-line learning process of the RBF chip is compared numerically with the results of the RBF neural network learning process written in the MATLAB program. The performance of the designed RBF neural chip is tested for the real-time pattern classification of the XOR logic. Performances are evaluated by comparing results from the MATLAB through extensive experimental studies. 相似文献