基于新型RBF网络的雷达信号分选识别方法

提出了一种基于径向基函数 (RBF)网络的雷达信号分选识别方法 .这种RBF网络分选系统采用改进免疫算法设计RBF网络的隐层参数 ,可以达到较高的优化效率 ,使系统结构趋于全局最优 .在复杂雷达信号环境下的仿真实验表明 ,这种基于RBF网络的雷达分选识别系统能够有效利用输入信号资源 ,达到了较高的分选精度.     

基于免疫RBF神经网络的语音情感识别

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。     

基于多二维RBF神经网络的航空雷达信号分选

针对航空雷达信号分选中侦察装备普遍存在的信号分选实时性差,分选结果经常出现增批、漏批现象的缺点.为了提高侦察系统在复杂电磁环境下准确快速的分选出雷达辐射源信号,根据径向基(RBF)神经网络通过理想数据训练后能够对未知数据进行分类的特点,将径向基神经网络算法用于对航空雷达侦察信号的分选,在此基础上提出了一种新型多二维径向基神经网络结构,通过与BP网络、RBF网络的对比,多二维径向基神经网络的识剐率优于其它几种网络,而且其结构便于实现.通过试验结果可以得出,多二维径向基神经网络能够提高雷迭信号分选的准确率.     

基于灰色关联度神经网络的雷达型号识别模型

针对现代电子战对雷达目标信号的复杂性和残缺性以及实用雷达目标识别系统的健壮性和扩展性等要求,提出一种基于灰色关联度和BP神经网络的灰色神经网络识别模型.首先采用比较成熟的BP神经网络对侦察雷达目标信号进行粗分,识别出雷达的体制;然后把模板数据库中该体制的雷达标准数据作为比较序列,建立差异信息空间,再把观测的数据和比较序列进行灰关联度分析,得出其对应的关联度,从而识别出雷达的具体型号.仿真结果表明在对参数残缺或畸变以及新体制的雷达辐射源进行识别时,取得良好的效果.表明综合灰色神经网络对辐射源进行识别是完全可行的,并且可以提高识别率、可靠性.     

基于IRBF的入侵检测系统的研究

入侵检测是一种积极、动态的网络安全防护技术,能够对网络内外攻击进行防御,在保障网络安全方面起着重要的作用。研究一种将基于克隆选择原理的免疫识别算法应用于RBF(Radial Basis Function)神经网络的学习算法。该算法将输入数据作为抗原,抗体作为RBF神经网络的隐层中心,采用最小二乘递推法确定权值,提高了RBF神经网络收敛速度和精度。该算法被成功地运用到入侵检测系统中。理论与实验表明该算法具有较好的检测能力,可以较好地提高入侵检测的效率,降低误报率。     

一种RBF神经网络在语音识别中的应用

主要内容是建立一种基于RBF神经网络的语音识别系统,探讨RBF神经网络在语音识别中的应用.利用有序聚类算法对语音信号进行时间归整,构建一个RBF神经网络,采用自适应的方法确定网络隐节点的个数,用线性最小二乘法确定隐层到输出层的权值,用语音信号的LPCC参数的训练和识别.在Matlab中完成实验,语音信号的识别率达到85%,并且还有很大的提升空间.实验表明RBF神经网络在语音识别中有发展的前景.     

基于免疫算法的RBF网络在信道均衡中的应用

针对严重非线性失真信道,提出了一种基于免疫算法的径向基函数(RBF)网络自适应均衡器.这种均衡器引入了判决反馈均衡器的结构,并采用免疫算法确定RBF网络隐层(非线性层)的结构和参数.免疫 算法具有全局搜索能力,它通过引入多样性保持机制和免疫记忆机制提高了算法的优化效率,并在一定程度上克服了未成熟收敛现象.仿真结果表明,这种基于免疫算法的RBF网络均衡器性能优良,具有很强的抑制非线性失真的能力.􀁱     

基于免疫神经网络的故障诊断方法研究

设计了一种免疫神经网络故障诊断方法,将神经网络权值进行编码作为抗体,将网络误差作为抗原,算法首先利用免疫算法的全局收敛特性,对网络权值进行全局搜索,然后再利用BP算法的局部搜索性能对网络权值进行局部搜索;以抽油机井为对象进行了仿真研究,并与BP神经网络故障诊断方法进行比较分析,表明免疫神经网络故障诊断方法能够有效避免陷入局部极小值的现象,并且在一定程度上加快了算法的运行速度。     

基于神经网络与主观Bayes理论的雷达识别研究

提出一种数据融合中雷达型号的三级识别模型，该模型将人工神经网络，模糊匹配和主观Bayes理论有效地结合起来，基本思路为：首先用神经网络进行粗分类，识别出雷达的体制，然后通过模糊匹配识别出该体制下的型号；最后根据主观Bayes理论对不同空域和时域的数据进行融合。实验结果表明，该模型表明：该模型提高了数据融合中的雷达信号识别率和可靠性。显示了在强噪声环境下良好的应用前景。     

一种基于免疫和Hopfield神经网络的多峰值优化算法

分析了免疫算法和Hopfield神经网络的优缺点,提出了一种解决多峰值函数优化问题的混合算法。Hopfield神经网络易于硬件实现,具有简单、快速的优点,但是对初始值具有依赖性以及容易陷入局部极值。免疫算法具有识别多样性的特点,但搜索效率和精度不高。将两算法结合起来,优势互补。首先用免疫算法寻优,然后对所得具有全局多样性的解进行聚类分析,所得聚类中心作为Hopfield神经网络的初始搜索点,最后利用Hopfield神经网络逐个寻优。实验表明,该算法是一种有效的求解多峰函数优化问题的方法,与免疫算法相比,搜索效率和精度都较高。     

基于RBF神经网络的润滑油自动识别系统设计

目前通过油料常规质量指标和成分结构信息进行油料种类识别的方法因所需仪器设备多,分析测试过程复杂而缺乏实用性和推广价值;在分析油品理化性能指标与其类别间的相关关系及神经网络的特点后,以最简单方式提取尽可能多的特征参数为原则,通过表观特征参数的途径,设计了一种简单小巧的装置,可同时提取油料密度、粘度、吸光度、电导率和介电常数等参数的特征向量,提出了用RBF神经网络进行油料种类识别的方法,并给出了实现算法;实验结果及应用情况表明,该方法识别效果比较理想,为当前油料种类识别问题给出了一种新的解决途径。     

基于免疫RBF神经网络的逆运动学求解

求解机械臂逆运动学问题可以采用神经网络来建立逆运动学模型,通过遗传算法或BP算法训练神经网络的权值从而得到问题的解,在求解精度和收敛速度上有待进一步改进。采用人工免疫原理对RBF网络训练数据集的泛化能力在线调整隐层结构,生成RBF网络隐层。当网络结构确定时,采用递推最小二乘法确定网络连接权值。由此对神经网络的网络结构和连接权进行自适应调整和学习。通过仿真可以看出,用免疫原理训练的神经网络收敛速度快,泛化能力强,可大幅提高机械臂逆运动学求解精度。     

Three-dimensional medical image recognition of cancer of the liver by a revised radial basis function (RBF) neural network algorithm

In this study, we propose a revised radial basis function (RBF) neural network algorithm and apply this algorithm to computer-aided diagnosis (CAD) of the liver. First, the revised RBF neural network algorithm is applied to recognition of the liver regions, and the recognition results are compared with those obtained using the conventional RBF neural network and the conventional multilayered neural network trained using the back-propagation algorithm. It is shown that the revised RBF neural network is accurate, and is a useful method because the parameters are automatically determined. Then, the revised RBF neural network is applied to CAD of the liver cancer called hepatocellular carcinoma (HCC).     

Improvement of RBF neural networks using Fuzzy-OSD algorithm in an online radar pulse classification system

In this paper a new methodology for training radial basis function (RBF) neural networks is introduced and examined. This novel approach, called Fuzzy-OSD, could be used in applications, which need real-time capabilities for retraining neural networks. The proposed method uses fuzzy clustering in order to improve the functionality of the Optimum Steepest Descent (OSD) learning algorithm. This improvement is due to initialization of RBF units more precisely using fuzzy C-Means clustering algorithm that results in producing better and the same network response in different retraining attempts. In addition, adjusting RBF units in the network with great accuracy will result in better performance in fewer train iterations, which is essential when fast retraining of the network is needed, especially in the real-time systems. We employed this new method in an online radar pulse classification system, which needs quick retraining of the network once new unseen emitters detected. Having compared result of applying the new algorithm and Three-Phase OSD method to benchmark problems from Proben1 database and also using them in our system, we achieved improvement in the results as presented in this paper.     

一种基于人工免疫原理的最优模糊神经网络控制器

提出了一种基于人工免疫原理的最优RBF模糊神经网络控制器设计方案．首先给出了控制器结构，其次将免疫进化算法用于控制器参数的优化，设计了一种满足二次型性能指标的最优RBF模糊神经网络控制器．将该控制器用于控制实际倒立摆系统，并采用状态变量合成方法以大大减少模糊规则的数目，实验结果验证了该控制器的有效性．     

基于RBF神经网络的抗噪语音识别

针对目前在噪音环境下语音识别系统性能较差的问题,利用RBF神经网络具有最佳逼近性能、训练速度快等特性,分别采用聚类和全监督训练算法,实现了基于RBF神经网络的抗噪语音识别系统。聚类算法的隐含层训练采用K－均值聚类算法,输出层的学习采用线性最小二乘法;全监督算法中所有参数的调整基于梯度下降法,它是一种有监督学习算法,能够选出性能优良的参数。实验表明,在不同的信噪比下,全监督算法较之聚类算法有更高的识别率。     

Hyperchaos synchronization using PSO-optimized RBF-based controllers to improve security of communication systems

This paper studies the Lorenz hyperchaos synchronization and its application to improve the security of communication systems. Two methods are proposed to synchronize the general forms of hyperchaotic systems, and their performance in secure communication application is verified. These methods use the radial basis function (RBF)-based neural controllers for this purpose. The first method uses a standard RBF neural controller. Particle swarm optimization (PSO) algorithm is used to derive and optimize the parameters of the RBF controller. In the second method, with the aim of increasing the robustness of the RBF controller, an error integral term is added to the equations of RBF neural network. For this method, the coefficients of the error integral component and the parameters of RBF neural network are also derived and optimized via PSO algorithm. For better comparison, the proposed methods and an optimal PID controller optimized by PSO are applied to the Lorenz hyperchaotic system for secure communication. Simulation results show the effectiveness and superiority of the proposed methods in both performance and robustness in comparison with the PID controller.     

An optimized RBF neural network algorithm based on partial least squares and genetic algorithm for classification of small sample

Radial basis function (RBF) neural network can use linear learning algorithm to complete the work formerly handled by nonlinear learning algorithm, and maintain the high precision of the nonlinear algorithm. However, the results of RBF would be slightly unsatisfactory when dealing with small sample which has higher feature dimension and fewer numbers. Higher feature dimension will influence the design of neural network, and fewer numbers of samples will cause network training incomplete or over-fitted, both of which restrict the recognition precision of the neural network. RBF neural network has some drawbacks, for example, it is hard to determine the numbers, center and width of the hidden layer’s neurons, which constrain the success of training. To solve the above problems, partial least squares (PLS) and genetic algorithm(GA)are introduced into RBF neural network, and better recognition precision will be obtained, because PLS is good at dealing with the small sample data, it can reduce feature dimension and make low-dimensional data more interpretative. In addition, GA can optimize the network architecture, the weights between hidden layer and output layer of the RBF neural network can ease non-complete network training, the way of hybrid coding and simultaneous evolving is adopted, and then an accurate algorithm is established. By these two consecutive optimizations, the RBF neural network classification algorithm based on PLS and GA (PLS-GA-RBF) is proposed, in order to solve some recognition problems caused by small sample. Four experiments and comparisons with other four algorithms are carried out to verify the superiority of the proposed algorithm, and the results indicate a good picture of the PLS-GA-RBF algorithm, the operating efficiency and recognition accuracy are improved substantially. The new small sample classification algorithm is worthy of further promotion.     

基于多特征融合和BoostingRBF神经网络的人脸识别

提出一种多特征信息融合的人脸识别方法.应用Zernike矩方法和非负矩阵分解法(NMF)分别提取具有旋转不变性的人脸几何特征和人脸子空间投影系数特征,将这两种具有一定互补性的特征串行融合,得到一个分类能力更强的特征.在此基础上,采用RBF神经网络进行人脸识别.为了提高神经网络的分类准确率和泛化能力,采用Boosting方法进行网络集成.实验结果表明,提出的算法利用较少样本数据即可快速地进行人脸识别.