自组织区间二型模糊神经网络及其自适应学习算法

针对复杂不确定非线性系统的辨识问题,提出一种基于聚类的自组织区间二型模糊神经网络学习算法.首先采用具有两个不同加权参数的FCM算法对输入数据进行划分来获取规则前件的不确定均值,同时结合聚类有效性标准确定模糊规则数目,从而自动完成神经网络的结构辨识和规则前件参数辨识;随后给出了基于梯度下降法和Lyapunov函数稳定收敛定理的规则后件权向量学习速率的自适应学习算法.通过非线性系统辨识实例,验证了该算法与其他方法相比具有更快的收敛速度和更高的逼近精度;并且利用该算法建立了某市电力短期负荷预测模型,结果表明该模型具有较高的预测精度,泛化性能更佳.     

基于划分模糊度的聚类有效性函数

模糊C-均值(FCM)聚类算法是目前最流行的数据集模糊划分方法之一.但是,有关聚类类别数的合理选择和确定,即聚类有效性分析,对FCM算法而言仍是一个开放性问题.为此,本文结合数据集的几何结构信息和FCM算法的模糊划分信息,重新定义了划分矩阵,进而利用划分模糊度提出了一种新的模糊聚类有效性函数.实验结果表明该方法是有效的且具有良好的鲁棒性.     

基于模糊粗糙模型的粗神经网络建模方法研究

提出一种基于模糊粗糙模型的粗神经网络建模(FRM_RNN_M)方法. 该方法通过自适应G-K聚类实现输入输出积空间的模糊划分, 进而在聚类数和约简属性搜索的基础上, 提取优化的模糊粗糙模型(Fuzzy rough model, FRM), 并在融合神经网络后实现粗神经网络建模. 分类实验表明, FRM_RNN_M的分类性能优于传统贝叶斯和LVQ方法, 而且比单纯的FRM模型具有更强的综合决策能力, 和传统的粗逻辑神经网络(Rough logic neural network, RLNN)相比, FRM_RNN_M方法建立的神经网络结构精简, 收敛速度快, 具有更强的泛化能力.     

模糊神经网络在数据采掘中的应用研究

提出了一种基于模糊神经网络的数据采掘新方法。该方法首先基于Rough sets思想获取初始规则和训练集，基于采掘属性的数目和分类目标确定网络结构，通过遗传(GA)算法对网络进行优化，通过BP算法实现网络权值的在线调整，最后对所生成的规则进行简化，提取模糊规则。仿真实例结果表明，该方法是行之有效的。     

神经模糊系统中模糊规则的优选

提出一种基于两级聚类算法的自组织神经模糊系统，该系统采用两级聚类算法（改进的最近邻域聚类算法和Gustafson-Kessel模糊聚类算法）对输入／输出数据进行模糊聚类，并由模糊聚类的划分熵确定最优划分，建立模糊模型，模型精度可由梯度下降法进一步提高。仿真结果表明，这种神经模糊系统具有结构简单、规则数少、学习速度快以及建模精度高等特点。     

一种关于模糊时间序列模型论域划分的多尺度比率算法

针对模糊时间序列研究中比率划分论域方法存在对非均匀数据划分效果不理想的缺陷, 提出一种基于模糊C 均值聚类(FCM) 算法的多尺度比率划分论域的方法. 首先利用FCM算法对样本数据进行分类; 然后计算各类数据的平均相对误差, 并基于各类的平均误差划分论域, 产生非等间隔的多尺度论域划分方法; 最后, 通过算例表明了多尺度比率论域划分方法的有效性.     

K-聚类的模糊神经网络对DO的控制研究

运用一种基于K-聚类算法的模糊径向基函数（RBF）神经网络对污水处理中的溶解氧质量浓度进行控制,该方法结合了模糊控制的推理能力强与神经网络学习能力强的特点,将模糊控制、RBF神经网络以及K-聚类学习算法相结合以在线调整隶属函数,优化控制规则。通过对阶跃输入仿真分析,其结果表明基于RBF的模糊神经网络控制器具有良好的动态性能、较强的鲁棒性和抗干扰能力,使其快速、准确地达到期望水平。     

一种新的模糊时间序列模型的预测方法

针对目前在模糊时间序列模型中论域划分及数据模糊化方法存在的问题,首先提出了基于模糊聚类算法(FCM)的具有可调参数的模糊时间序列论域的非等分划分方法;然后,在数据模糊化时通过距离客观地定义了模糊集,并利用最小标准误差(RMSE)确定最优的预测结果和聚类数;最后,通过 Alabama 大学注册人数的预测表明了所提出算法的有效性.     

一种基于类覆盖和粒子群优化的模糊神经网络系统

提出一种基于类覆盖获取有向图和粒子群优化方法的模糊神经网络模式识别系统模型，该模型利用改进的贪心算法获得半径较均匀的超球体类覆盖，再利用超球体类覆盖实现模糊输入空间划分和模糊IF-THEN规则提取，以此实现模糊神经网络系统的结构辨识；采用改进的模糊加权型Mamdani推理法确定系统的输出，并使用基于粒子群优化的算法对系统参数进行精炼，使系统具有很好的强壮性和识别率．对11种矿泉水味觉信号的识别实验结果证明了该系统的可行性和有效性．     

一种基于神经网络的自组织模糊系统

提出了一种基于神经网络的自组织模糊系统,它能够根据输入输出数据灵活地划分模糊集合,由于采用模糊聚类方法和梯度下降法分两步对该系统进行训练,其收敛速度要比传统的ＢＰ算法快速得多,仿真结果表明该系统结构简单,学习速度快,规则数少,模糊精度高。     

基于粗-模糊神经网络的决策控制

通过将模糊集和粗集,神经网络结合,提出了一种基于模糊规则的新的粗模糊神经网络,它通过利用误差反向传播算法实时修正该新型网络中的权值参数,从而能被有效地应用于不确定系统的决策分类与模式识别问题.最后通过对一个不确定决策系统的模式识别的仿真结果表明该粗模糊神经网络能大大提高模式识别决策的准确率.     

一种基于粗糙集的网络安全评估模型

准确掌握计算机网络系统的安全水平对于保障网络系统的正常运行具有重要意义.当前大多数网络安全评估系统缺乏对数据的深入分析,难以形成对网络安全状况的整体认识.本文提出了一种利用粗糙集理论挖掘网络安全评估规则,进而利用评估规则构建网络安全评估决策系统的算法模型.研究了网络安全评估问题的粗糙集描述,给出了模糊属性决策表的约简方法.利用一个简化的网络安全评估数据集,验证了本文提出的决策规则提取方法,结果表明该方法可以得到与实际情况相符的决策规则.     

一种基于精简的模糊规则库的分类算法*

结合模糊聚类和粗糙集提出了一种基于精简的模糊规则库分类算法.对于数值型样本数据,首先采用模糊聚类生成模糊规则库,然后运用粗糙集理论对样本属性进行约简,删除冗余规则,即可得到精简的模糊规则库,以方便进行分类决策.通过对IRIS的仿真测试表明,本算法所产生的模糊规则不仅简单易懂,而且分类效果很好.     

Prediction of service life of large centrifugal compressor remanufactured impeller based on clustering rough set and fuzzy Bandelet neural network

In order to predict the service life of large centrifugal compressor impeller correctly, the rough set and fuzzy Bandelet neural network are combined to construct the novel prediction model which can give full play to theirs advantages. The attribute reduction algorithm based rough set and clustering method is firstly designed to optimize the inputting variables of fuzzy Bandelet neural network. And then the prediction model based on fuzzy Bandelet neural network is proposed, the Bandelet function is used as the excitation function of hidden layer and is combined with fuzzy theory to improve the prediction effectiveness of the prediction model. The training algorithm of fuzzy Bandelet neural network is designed based on improved genetic algorithm, the improved genetic algorithm introduces the adaptive differential evolution method into the traditional genetic algorithm, which can effectively optimize the parameters of fuzzy Bandelet neural network. Finally, the original 30 input variables of fuzzy Bandelet neural network are reduced to 9 input nodes based on rough set using 500 remanufacturing impellers as research objects. The service life of remanufacturing impeller is predicted based on three prediction models, and simulation results show that the fuzzy Bandelet neural network optimized by improved genetic algorithm has highest prediction precision and efficiency, which can correctly predict the service life of remanufacturing impeller.     

Rough set feature selection and rule induction for prediction of malignancy degree in brain glioma

The degree of malignancy in brain glioma is assessed based on magnetic resonance imaging (MRI) findings and clinical data before operation. These data contain irrelevant features, while uncertainties and missing values also exist. Rough set theory can deal with vagueness and uncertainty in data analysis, and can efficiently remove redundant information. In this paper, a rough set method is applied to predict the degree of malignancy. As feature selection can improve the classification accuracy effectively, rough set feature selection algorithms are employed to select features. The selected feature subsets are used to generate decision rules for the classification task. A rough set attribute reduction algorithm that employs a search method based on particle swarm optimization (PSO) is proposed in this paper and compared with other rough set reduction algorithms. Experimental results show that reducts found by the proposed algorithm are more efficient and can generate decision rules with better classification performance. The rough set rule-based method can achieve higher classification accuracy than other intelligent analysis methods such as neural networks, decision trees and a fuzzy rule extraction algorithm based on Fuzzy Min-Max Neural Networks (FRE-FMMNN). Moreover, the decision rules induced by rough set rule induction algorithm can reveal regular and interpretable patterns of the relations between glioma MRI features and the degree of malignancy, which are helpful for medical experts.     

结合粗糙集和模糊聚类方法的属性约简算法

本文针对粗糙集理论的属性约简算法进行了研究。结合模糊聚类方法，提出了一个新的属性约简算法，用户可以根据实际决策需要和领域知识更改阈值λ，从而得到用户满意的属性约简结果。最后利用该文的算法给出了一个实例的约筒结果。     

一种用于机场气象预测的模糊神经网络模型

针对民用机场多因素气象预测问题的复杂性,该文构建出一种基于粗糙集的模糊神经网络模型。采用粗糙集理论约简属性,挖掘潜在规则,在此基础上建立模糊神经网络模型,并根据规则的统计性质和离散化结果初始化网络参数,采用BP算法训练网络。实例验证,该模型在收敛速度与预测精度上优于传统的神经网络模型。     

Rough sets for adapting wavelet neural networks as a new classifier system

Classification is an important theme in data mining. Rough sets and neural networks are two techniques applied to data mining problems. Wavelet neural networks have recently attracted great interest because of their advantages over conventional neural networks as they are universal approximations and achieve faster convergence. This paper presents a hybrid system to extract efficiently classification rules from decision table. The neurons of such hybrid network instantiate approximate reasoning knowledge gleaned from input data. The new model uses rough set theory to help in decreasing the computational effort needed for building the network structure by using what is called reduct algorithm and a rules set (knowledge) is generated from the decision table. By applying the wavelets, frequencies analysis, rough sets and dynamic scaling in connection with neural network, novel and reliable classifier architecture is obtained and its effectiveness is verified by the experiments comparing with traditional rough set and neural networks approaches.     

基于局部线性聚类算法的模糊建模

提出了一种新的基于T-S模糊模型的建模方法，首先通过一种局部线性聚类算法，自适应确定模糊规则数目及初始T-S模型的前提和结论参数，建立相应的一阶T-S模糊神经网络．并用梯度下降和递推最小二乘混合算法训练网络参数，从而提高建模精度．最后，通过两个仿真实例验证了本文方法的有效性．     

Rough Neural Network Based on Bottom-Up Fuzzy Rough Data Analysis

Based on bottom-up fuzzy rough data analysis, a new rough neural network decision-making model is proposed. Through supervised Gaustafason–Kessel (G–K) clustering algorithm, proper fuzzy clusters are found to partition the input data space. At the same time cluster number is searched by monotone increasing process. If the cluster number matches with that exactly exist in data sets then excellent fuzzy rough data modeling (FRDM) model can be built. And by integrating it with neural network technique, corresponding rough neural network is constructed. Our method overcomes the defects of conventional top-down based rough logic neural network (RLNN) method, and it also achieves adaptive learning ability and comprehensive soft decision-making ability compared with FRDM model. The experiment results indicate that our method has stronger generalization ability and more compact network structure than conventional RLNN.