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一种用于PCA与MCA的神经网络学习算法 总被引:5,自引:0,他引:5
主元分析(PCA)和次元分析(MCA)是用于特征提取、数据压缩、频率估计、曲线拟合等信号处理的基本技术,以神经网络来实现PCA和MCA是当今研究的一大热点,相关矩阵R的特征值重数不为1时的主、次元分析则是其中一大难题,本文提出了一种新的学习算法,使得在输入数据的相关矩阵含多重特征值时,网络权重矢量亦收敛于相关矩阵的单位正交特征矢量。 相似文献
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文章概述了印制线路板产品(PCB)的计算机辅助仿真系统(CAE)的理论计算基础方法──有限元法(FEM),以及如何运用于PCB的建模和仿真,并籍此设计出符合有关电磁兼容(EMC)规则的PCB电子产品。 相似文献
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InAs/InP_(0.7)Sb_(0.3)热电子晶体管的电流增益及最高收集极电压 总被引:1,自引:1,他引:0
续竞存 《固体电子学研究与进展》1995,15(1):41-44
分析InAs/InP(0.7)Sb(0.3)热电子晶体管的电流增益β及最高收集极电压V(CM)。计算结果表明,β超过20,V(CM)接近1.5V。 相似文献
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介绍在Windows9.x下用VB5.0的串行通信控件(MSCOMM.OCX)和应用编程接口(API)来实现通讯功能。 相似文献
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16kbpsCVSD与64kbpsPCM编码数字转换算法 总被引:1,自引:0,他引:1
本文提出了16kbps连续可变斜率增量调制(SVSD)与64kbpsA律PCM编码数字转换臬法,在无传输误码情况下,采用该转换算法,(1)从CVSD转换到PCM时,同直接CVSD编码相比,分段信噪比(SNRSEG)恶化小于0.1dB,信噪比(SNR)恶化小于0.01dB,多次转换(转换次数≥2)时SNR和SNRSEG保持不变,即无误差积累;(2)从PCM转换到CVSD时,同直接CVSD编码相比,S 相似文献
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本文提出了16kbps连续可变斜率增量调制(SVSD)与64kbpsA律PCM编码数字转换臬法,在无传输误码情况下,采用该转换算法,(1)从CVSD转换到PCM时,同直接CVSD编码相比,分段信噪比(SNRSEG)恶化小于0.1dB,信噪比(SNR)恶化小于0.01dB,多次转换(转换次数≥2)时SNR和SNRSEG保持不变,即无误差积累;(2)从PCM转换到CVSD时,同直接CVSD编码相比,S 相似文献
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本文针对BAM和TAM网络处理数据串联想时的困难和不足,提出了一种基于环形结构的联想记忆网络,称为环形联想记忆网络(CAM),给出了网络的拓扑结构和网络的三种基本联想模式,讨论了存储网络连接权所需要的存储量,并与BAM和TAM联想记忆网络进行了比较,最后给出了实验研究的结果。 相似文献
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本文介绍了B-ISDN中业务量控制的原理和方法,讨论了连接/呼叫接纳控制(CAC)和用法/网络参数控制(UPC/NPC)两个最基本的业务量控制功能,并对网络拥塞控制、业务量成形、优先级控制和快速资源管理等附加的控制功能作了简要的叙述。 相似文献
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有效的信号和图像分解(分离)技术在信号和图像的分析、增强、压缩、复原等领域起着重要的作用.虽然目前研究者提出了很多方法来解决这个问题,然而处理效果并不完美.形态成分分析(Morphological Component Analysis,MCA)是最新提出的一种基于稀疏表示的信号和图像分解(分离)方法.该方法的主要思想是利用信号组成成分的形态差异性(可以由不同的字典稀疏表示)进行分离.本文详细描述了形态成分分析方法的理论思想,并介绍了形态成分分析的最新研究进展及其存在的问题,最后指出了进一步发展的方向. 相似文献
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FUZZY PRINCIPAL COMPONENT ANALYSIS AND ITS KERNEL- BASED MODEL 总被引:1,自引:0,他引:1
Wu Xiaohong Zhou Jianjiang 《电子科学学刊(英文版)》2007,24(6):772-775
Principal Component Analysis(PCA)is one of the most important feature extraction methods,and Kernel Principal Component Analysis(KPCA)is a nonlinear extension of PCA based on kernel methods.In real world,each input data may not be fully assigned to one class and it may partially belong to other classes.Based on the theory of fuzzy sets,this paper presents Fuzzy Principal Component Analysis(FPCA)and its nonlinear extension model,i.e.,Kernel-based Fuzzy Principal Component Analysis(KFPCA).The experimental results indicate that the proposed algorithms have good performances. 相似文献
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一种基于加权变形的2DPCA的人脸特征提取方法 总被引:5,自引:0,他引:5
该文首先分析了主成分分析法(PCA)和2维主成分分析法(2DPCA)的关系,针对2DPCA丢失具有鉴别能力的协方差信息以及PCA方法不能解决小样本的问题,提出了基于一种加权变形的2DPCA的人脸特征提取方法(WV2DPCA),该方法利用变形的2DPCA方法分别对人脸3个子部分分别提取特征,然后根据最近邻理论和权值进行分类。经过在ORL人脸库和YALE人脸库的实验研究表明:与2DPCA相比,提高了人脸空间的识别率,压缩了人脸空间的系数,减少了识别时间;在识别的准确率方面,更优于传统的Fisherfaces,IC,Kernel Eigenfaces的算法。 相似文献
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Active Shape Model (ASM) is a powerful statistical tool to extract the facial features of a face image under frontal view. It mainly relies on Principle Component Analysis (PCA) to statistically model the variability in the training set of example shapes. Independent Component Analysis (ICA) has been proven to be more efficient to extract face features than PCA. In this paper, we combine the PCA and ICA by the consecutive strategy to form a novel ASM. Firstly, an initial model, which shows the global shape variability in the training set, is generated by the PCA-based ASM. And then, the final shape model, which contains more local characters, is established by the ICA-based ASM. Experimental results verify that the accuracy of facial feature extraction is statistically significantly improved by applying the ICA modes after the PCA modes. 相似文献
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Long Fei He Jinsong Ye Xueyi Zhuang Zhenquan Li Bin 《电子科学学刊(英文版)》2006,23(1):103-106
Subspace modeling plays an important role in face recognition. Independent Component Analysis (ICA), a multivariable statistical analysis technique, can be seen as an extension of traditional Principal Com- ponent Analysis (PCA) technique, which addresses high order statistics as well as second order statistics. In this paper, a new scheme of subspace-based representation called Discriminant Independent Component Analysis (DICA) is proposed, which combines the strength" of unsupervised learning of ICA and supcrvised learning of Linear Discriminant Analysis (LDA), and efficiently enhances the generalization ability of ICA-based representation method. Based on DICA subspace analysis, a set of optimal vectors called "discriminant independent faces" are learned from face samples. The effectiveness of our method is demonstrated by performance comparisons with some popular methods such as ICA, PCA, and PCA+LDA. On the large scale database of IIS, significant improvements are observed when there are fewer training samples per person available. 相似文献
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Wen Chenglin Wang Tianzhen Hu Jing 《电子科学学刊(英文版)》2007,24(1):108-111
In this letter, the new concept of Relative Principle Component (RPC) and method of RPC Analysis (RPCA) are put forward. Meanwhile, the concepts such as Relative Transform (RT), Rotundity Scatter (RS) and so on are introduced. This new method can overcome some disadvantages of the classical Principle Component Analysis (PCA) when data are rotundity scatter. The RPC selected by RPCA are more representative, and their significance of geometry is more notable, so that the application of the new algorithm will be very extensive. The performance and effectiveness are simply demonstrated by the geometrical interpretation proposed. 相似文献