一种新的线性判别准则在人脸识别中的应用

针对Fisher线性判别分析(LDA)在进行人脸识别这种小样本问题分类时常常遇到类内散度矩阵Sw奇异,而无法直接应用的问题,提出一种新的线性判别准则,即:定义一个新的准则函数,在对类内散度矩阵无奇异性要求的情况下,找到此准则函数最优的权向量.应用此判别准则和Fisher LDA方法分别在ORL人脸数据库上选取40个人的图像进行识别率的测试,Fisher LDA方法的识别率为0.95,而本文方法的识别率可以达到0.955,优于Fisher LDA方法.     

一种基于加权核Fisher准则的朴素贝叶斯分类器

利用加权核Fisher准则,给出一种朴素贝叶斯分类器的改进算法。该算法通过寻找使类与类最大分离的最优投影矩阵,将样本数据进行投影变换,再利用朴素贝叶斯分类器对新样本进行分类。将该方法应用于双酚A生产过程在线监测数据集的分类中,仿真结果表明,相比于单纯朴素贝叶斯分类器,该分类算法具有更好的分类性能。     

基于加权Fisher模糊判别准则的真彩色影像分类方法研究

针对Fisher判别分类中,选取样本不平衡导致Fisher线性判别性能下降,提出了加权Fisher判别对类内散布矩阵进行修正的方法.同时,针对Fisher判别准则为阈值分类器,引入了一种新的Fisher模糊判别准则.该方法应用于无人机真彩色影像的道路、植被、裸土地分类,取得了较好的分类结果.并与传统Fisher方法进行...     

基于改进Fisher准则与极限学习机集成的图像隐写分析

集成分类器是目前图像隐写分析中广泛使用的分类器。针对集成分类器中基分类器受离群样本影响较大,集成策略效果不佳的缺点,提出一种基于改进Fisher准则与极限学习机集成的图像隐写分析算法。首先,通过重新定义类内散度矩阵以提高Fisher准则模型的准确性,之后基于改进的Fisher准则并使用Bagging算法训练若干基分类器,最后使用极限学习机作为元分类器来建立基分类器集合与正确决策之间的联系。实验结果表明,在不同的隐写算法与嵌入率的条件下,与传统集成分类器和基于选择性集成的集成分类器相比,所提算法降低了3.5%与1.8%的检测错误率,说明能够有效提高集成分类器的检测精度。     

基于改进和声算法的有序样本聚类及其应用

标准和声算法只能解决连续型优化问题,而有序样本聚类属于离散型优化问题。将Fisher算法和和声算法相结合,提出一种改进和声算法,使之能够用于离散型优化问题,并利用其对有序样本进行分类。数值仿真实验结果表明,该算法分类结果符合实际。结论表明改进和声算法是一种全局最优算法,分类结果优于Fisher算法。     

基于改进ISOMAP算法的图像分类

利用基于邻域的图像欧氏距离寻找最近邻,并用直接线性判别分析方法(Direct LDA)取代多维尺度分析法(MDS),提出一种改进的等距特征映射(ISOMAP)算法(KIMD-ISOMAP)进行降维.人脸图像分类试验表明:KIMD-ISOMAP提高了ISOMAP的分类能力,扩展了邻域半径的选取范围,在加高斯噪声和几何形变的情况下,该算法与其他方法相比,表现出较强的鲁棒性.     

基于辨别性深度信念网络的说话人分割

该文基于语音信号的超矢量特征空间,提出了一种基于Fisher准则的可辨别性深度信念网络(discriminativedeep belief network,DDBN)训练方法,得到了优于传统深度信念网络(deep belief network,DBN)的说话人码本矢量特征,并利用这些码本特征对多说话人的音段进行了聚类与分割。由TIMIT数据库生成的多说话人语音分割的实验结果表明,该基于Fisher准则函数的DDBN说话人分割算法的性能明显好于传统的Bayes信息判决(Bayesian informa-tion criterion,BIC)法和DBN法。     

一种RBFN和FLD融合的说话人识别方法

提出一种新的可用于说话人识别的径向基函数网络(RBFN)阵列．RBFN网设计思想是在确定网络中心点之后采用最小线性方差作为目标函数解得最优权重,该方法并不能得到最优分类效果．使用Fisher目标函数,替代RBF中的误差目标函数来求取最优权重,用与文本无关的闭集说话人识别系统对该算法进行了验证,实验结果表明,该方法提高了RBF分类能力,比传统的RBF、算法以及ROLS算法具有更高的识别率,并在识别效果接近GMM方法的情况下计算量大幅度减少。     

基于Fisher线性判别式的层次文档分类

将文档按照主题进行层次分类,利用Fisher线性判别式的思想来提取每一类的正特征词和负特征词,给出基于Fisher线性判别式的层次文档分类算法（HDCF）。HDCF不仅克服一般层次分类算法中假定特征词之间必须满足独立性的条件,而且能处理一个文档涉及多个类的分类问题。在实验中,采用召全率和准确率2个指标与其它算法进行比较,结果表明：HDCF的效果好于其它算法。     

一种改进的基因表达数据分类方法

从分类算法和特征基因选择两个方面研究基因表达数据的分类,将传统的Support Vector Machines(SVM)算法和K-nearest neighbor(KNN)算法两者结合成为一种应用于基因表达数据分类的算法,并针对基因表达数据分类数据集“样本少,维数高”的特点,提出了一种改进的基于相关性的递归特征消除算法(简称为C-RFE),消除了数据冗余．实验结果表明,新方法可有效提高分类准确率和特征选取的效率．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with