二阶微粒群优化神经网络的混沌系统辨识方法

针对BP神经网络在学习算法中的不足,将BP神经网络的权值和阀值训练问题转换为优化问题,提出一种利用二阶微粒群算法优化的神经网络的算法。其次,运用基于二阶微粒群算法训练的神经网络模型对混沌系统进行辨识,并与传统的BP神经网络、RBF网络对同一混沌系统辨识的结果进行比较。实验表明,利用二阶微粒群优化算法训练神经网络进行混沌系统辨识,辨识的效果优于其它几种神经网络模型,可有效用于混沌系统的辨识。     

基于改进微粒群神经网络的油料储备预测

根据油料储备历史数据样本进行油料储备预测,是实施油料保障有效举措.油料储备预测是具有不确定性、突变性的多变量复杂系统,预测难度大.为了解决采用传统预测法所存在的局限性,将微粒群优化算法与神经网络相融合,提出了改进微粒群神经网络的油料储备预测模型.利用神经网络自学习能力,捕捉预测系统非线性关系.将神经网络参数映射为实数码微粒,构造复合适应度函数.引入微粒距离系数,动态调整微粒速度和位置进化参数.借助微粒群优化算法较强全局搜索能力,训练神经网络参数,优化其结构,消除神经网络训练收敛慢、易陷入局部极值等现象.仿真实例表明,改进模型预测精确性评价指标良好,建模复杂度较低.     

微粒群优化动态神经网络模型结构分析

微粒群算法由于进化机制中的随机不确定性,其稳定性很难进行分析,所以对微粒群的研究多是根据经验的实际优化模型求解.针对该问题,利用鲁棒不确定性理论,将算法分解为时不变和不确定时变的结构,减少原有参数固定的假设条件,从而对引入动态惯性权重的微粒群算法的渐近稳定性进行分析.在此基础之上,采用李雅普诺夫方法,得到基于微粒群参数优化的动态神经网络收敛的充分条件,自适应调整微粒速度的上下限,为组合模型的实际应用提供参数选择的理论基础.最后,通过仿真实例验证了所给出微粒群算法稳定性条件和基于微粒群优化的动态神经网络收敛条件的有效性.     

模拟退火PSO的神经网络的网络流量预测模型

为解决网络流量时间序列的预测问题,针对传统BP神经网络的网络流量时间序列预测模型容易陷入局部极小值的不足,提出一种基于模拟退火的微粒群算法训练神经网络的网络流量时间序列预测模型.将模拟退火算法和基本粒子微粒群算法相结合,设计出一种基于模拟退火的微粒群算法.利用基于模拟退火微粒群算法优化BP神经网络的权值和阀值,对实际采集的网络流量时间序列进行建模.实验结果表明,基于模拟退火的微粒群算法训练的神经网络具有较高的预测效果,相对于传统的神经网络模型具有更高的预测精度和良好的自适应性.     

基于多种群协同进化微粒群算法的径向基神经网络设计

神经网络结构和权值的联合设计一直是神经网络进化设计的一个研究方向.本文根据基本微粒群算法的特点,借鉴递阶编码的思想,构造出一种多种群协同进化微粒群算法.该算法具有种群内个体微粒自由运动特征分量与种群运动特征分量分层递阶进化的特征,克服了标准微粒群算法在多峰函数寻优时出现的微粒“早熟”现象.应用该算法进行径向基神经网络隐层结构和径向基函数参数联合自适应设计,在非线性系统辨识中显示了比较好的收敛性和训练精度,同时也使网络的泛化能力和逼近精度这一对矛盾得到了比较好的协调统一.     

基于高斯微粒群优化的动态神经网络延迟系统辨识

为提高神经网络对未知非线性大滞后动态系统的泛化能力,提出一种基于高斯微粒群优化的自适应动态前馈神经网络.在输入层与隐含层之间、隐含层与输出层之间分别加入动态延迟算子,可以高效地辨识出系统纯滞后时间,建立精确系统模型.此外,采用高斯函数和混沌映射方法平衡微粒群算法全局寻优能力,以克服提前收敛的缺陷,从而快速有效地自适应优化网络中的参数.仿真实验表明了该方法在非线性人滞后系统辨识中的有效性.     

基于模糊神经网络的高校教师绩效评价方法

基于神经网络来构造模糊系统,综合模糊逻辑推理的结构性知识表达能力和神经网络的自学习能力,建立了高校教师绩效评价的模糊神经网络模型.通过建立评价指标建立等级模糊级,利用神经网络的学习能力,通过网络的训练样本,确定评价中的参数.克服了由专家确定参数的主观性,达到对教师绩效评价的客观性,科学性.     

矢量微粒群算法及其应用

在对微粒群优化算法PSO分析的基础上，提出了矢量微粒群优化算法VPSO。该算法通过矢量运算方法来定义微粒的运动，从而达到寻找最优解的目的。将VPSO和PSO分别用于常用测试函数的优化求解，结果表明：VPSO的优化性能明屁优于PSO。基于VPSO构造的矢量微粒群神经网络（VPSONN）在丙烯腈收率软测量建模的应用中表明：基于VPSONN的丙烯腈收率软测量模型具有较高的精度，应用前景广阔。     

基于文化微粒群算法的丙烯腈收率软测量模型

丙烯腈收率是丙烯腈装置的关键指标,如何得到丙烯腈收率是厂家很关注的研究,将新型优化算法用于丙烯腈收率软测量建模是1种较好的尝试。将新型微粒群优化算法用于同样新型的文化算法种群空间的优化,设计文化微粒群优化算法。它由种群空间和信念空间2部分组成,在种群空间和信念空间分别采用各自算法并行演化,同时,2个空间又根据一定的协议相互联系。分别将该算法和基本微粒群算法用于一些常用测试函数的优化问题;结果表明,与基本微粒群算法相比,文化微粒群算法加强了全局搜索能力,更容易收敛于全局最优解。最后将文化微粒群优化算法用于优化神经网络,构成文化微粒群神经网络,并将其应用于丙烯腈收率软测量建模。结果表明,此模型精度高,应用前景广阔。     

改进协同微粒群优化的模糊神经网络控制系统设计

针对协同微粒群算法不能保证收敛到局部或全局最优值的问题,提出一种改进协同微粒群算法(ICPSO),并证明了该算法能以概率1收敛干全局最优解.应用ICPSO建立一类非线性对象的神经网络辨识模型,并对系统的模糊神经网络自适应控制器的参数进行了离线和在线优化.仿真结果表明,ICPSO能提高系统的建模精度,增强模型的泛化能力,而且由ICPSO训练的控制器可以达到良好的控制效果.     

基于PSO-FNN的网络安全态势评测研究与实现

研究PSO-FNN模型下的神经网络自动网络安全态势,PSO即:particle Swarm Optimization,粒子群优化算法,PSO具有误差小、泛化力强、评价指标高等特点,对非数值信息具有很好的识别和处理能力,对于网络安全分析具有非常重要的实用价值。     

Neuro evolutionary model for weld residual stress prediction

Welding is an efficient reliable metal joining process in which the coalescence of metals is achieved by fusion. Localized heating during welding, followed by rapid cooling, induce residual stresses in the weld and in the base metal. Determination of magnitude and distribution of welding residual stresses is essential and important. Data sets from finite element method (FEM) model are used to train the developed neural network model trained with genetic algorithm and particle swarm optimization (NN–GA–PSO model). The performance of the developed NN–GA–PSO model is compared neural network model trained with genetic algorithm (NN–GA) and neural network model trained with particle swarm optimization (NN–PSO) model. Among the developed models, performance of NN–GA–PSO model is superior in terms of computational speed and accuracy. Confirmatory experiments are performed using X-ray diffraction method to confirm the accuracy of the developed models. These developed models can be used to set the initial weld process parameters in shop floor welding environment.     

Forecasting of Software Reliability Using Neighborhood Fuzzy Particle Swarm Optimization Based Novel Neural Network

This paper proposes an artificial neural network (ANN) based software reliability model trained by novel particle swarm optimization (PSO) algorithm for enhanced forecasting of the reliability of software. The proposed ANN is developed considering the fault generation phenomenon during software testing with the fault complexity of different levels. We demonstrate the proposed model considering three types of faults residing in the software. We propose a neighborhood based fuzzy PSO algorithm for competent learning of the proposed ANN using software failure data. Fitting and prediction performances of the neighborhood fuzzy PSO based proposed neural network model are compared with the standard PSO based proposed neural network model and existing ANN based software reliability models in the literature through three real software failure data sets. We also compare the performance of the proposed PSO algorithm with the standard PSO algorithm through learning of the proposed ANN. Statistical analysis shows that the neighborhood fuzzy PSO based proposed neural network model has comparatively better fitting and predictive ability than the standard PSO based proposed neural network model and other ANN based software reliability models. Faster release of software is achievable by applying the proposed PSO based neural network model during the testing period.      

基于Gabor+PCA特征与粒子群算法的部分遮挡人耳识别研究

在分析人耳Gabor特征基础上,提出一种主成分分析降维并利用基于粒子群优化训练的人工神经网络对部分遮挡人耳进行识别方法。选取了PCA方法降维后人耳图像的Gabor特征值作为人工神经网络训练样本,利用粒子群优化算法与多层前馈网络结合算法训练神经网络。与多种方法对比的实验表明,针对部分遮挡人耳的测试实验,基于Gabor+PCA特征与粒子群算法的部分遮挡人耳识别方法具有高识别性能,取得好的效果。     

An SNN-Based Semantic Role Labeling Model with Its Network Parameters Optimized Using an Improved PSO Algorithm

Semantic role labeling (SRL) is a fundamental task in natural language processing to find a sentence-level semantic representation. The semantic role labeling procedure can be viewed as a process of competition between many order parameters, in which the strongest order parameter will win by competition and the desired pattern will be recognized. To realize the above-mentioned integrative SRL, we use synergetic neural network (SNN). Since the network parameters of SNN directly influence the synergetic recognition performance, it is important to optimize the parameters. In this paper, we propose an improved particle swarm optimization (PSO) algorithm based on log-linear model and use it to effectively determine the network parameters. Our contributions are two-folds: firstly, a log-linear model is introduced to PSO algorithm which can effectively make use of the advantages of a variety of different knowledge sources, and enhance the decision making ability of the model. Secondly, we propose an improved SNN model based on the improved PSO and show its effectiveness in the SRL task. The experimental results show that the proposed model has a higher performance for semantic role labeling with more powerful global exploration ability and faster convergence speed, and indicate that the proposed model has a promising future for other natural language processing tasks.     

基于PSO和BP网络的粉状炸药配方的预测控制

BP神经网络具有良好的非线性处理能力,粒子群优化算法(PSO)提高神经网络的学习效率、保证神经网络全局收敛。针对粉状炸药配方控制系统中存在的强耦合、非线性及参数不确定等问题,建立一种基于粒子群和BP神经网络的炸药配方预测控制模型。仿真和现场运行结果表明,该配方控制系统具有良好的自学习和自适应能力,取得了良好的控制效果,满足实际生产要求。     

Melt index prediction by RBF neural network optimized with an MPSO-SA hybrid algorithm

Melt index (MI) is considered as an important quality variable which determines the product specifications, so reliable estimation of MI is crucial in the quality control of practical polypropylene (PP) polymerization processes. A novel MPSO-SA-RNN (modified PSO-SA algorithm and RBF neural network) MI prediction model based on radial basis function (RBF) neural network and artificial intelligent algorithms particle swarm optimization (PSO), and simulated annealing (SA) is presented, where the traditional PSO is modified first and then combined with SA to overcome the inherent defects in PSO and SA, and to achieve better optimization performance. The proposed optimization algorithm, MPSO-SA algorithm, is then used to optimize the parameters of the RBF neural network. Then the network is employed to build the MI prediction model, and the MPSO-SA-RNN model is thereby developed. Based on the data from a real plant, the approach presented above is evaluated and the research results confirm the validity of the proposed model, as well as the advantage of MPSO-SA algorithm to the traditional PSO and SA algorithms in handling optimization problems.     

一种井下配电网故障测距方法

针对采用随机选取法、K-均值聚类法确定RBF神经网络隐含层节点中心和宽度只能得到局部最优解、基本粒子群优化算法易发生早熟收敛且对于某些函数优化精度差的问题,提出了将惯性权重模型和收敛因子模型相结合的改进的粒子群优化算法;针对煤矿井下配电网发生单相接地故障后定位困难、传统的故障测距方法存在可靠性差、测距精度低的问题,提出了采用改进的粒子群优化算法优化RBF神经网络进行井下配电网单相接地故障测距的方法。仿真结果表明,经改进的粒子群优化算法优化的RBF神经网络的测距精度高于RBF神经网络,能够实现故障点的准确、可靠定位。     

基于粒子群优化BP神经网络的可靠性评估模型

CPU的可靠性对计算机系统至关重要。针对神经网络等方法在可靠性分析与评估中参数优化困难、模型评估精度不够准确等问题,提出一种基于粒子群优化BP神经网络的可靠性评估模型。该模型利用由正弦映射优化的PSO算法对BP神经网络的权值和阈值进行优化,提高BP神经网络的收敛速度以及评估精度。基于CPU中各功能模块的可靠度,根据改进的BP神经网络模型建立CPU的可靠性评估模型,通过模型训练与测试完成对CPU的可靠性评估。通过对比实验,验证该模型对辐射环境下CPU可靠性评估的有效性和准确性。