基于话者分类和HMM的话者自适应语音识别

本文提出了一种基于话者分类和ＨＭＭ的话者自适应语音识别方法，采用对参考话者聚类、并按话者类分别建立ＨＭＭ模板的策略，对于新注册的用户，系统只需利用其极少量的语音，便可将与之最相近的一类模板指派给新用户，再采用基于谱空间映射的两级自适应方法，使系统自适应到用户的模式下工作．这种方法既提高了识别性能，又降低了自适应的难度，还有利于ＨＭＭ的建立．讨论了话者分类数和自适应语音数据对话者自适应效果及识别性能的影响，提出了一种在自适应语音数据不足情况下仍具有较好自适应效果的基于ＦＶＱ的码本自适应改进算法，该算法还具有对自适应字表不敏感的特点．     

基于径向基函数神经网络的语音识别

提出一种基于径向基函数神经网络的改进聚类方法,并将此改进的神经网络应用于语音识别领域,建立一个非特定人的孤立词语音识别系统.此聚类方法采取有监督的学习方式,将训练样本的形心作为隐节点的质心,训练样本的分类数作为隐节点的个数.利用该方法对小词表汉语孤立词进行语音识别.结果表明,采用此算法的径向基函数的神经网络具有更好的分类能力,训练速度和识别率均优于传统的径向基函数网络.     

基因表达模式分析及软件系统

研究和实现了4种基因表达模式的聚类方法，开发了基因表达模式分析软件系统．该软件包含了两两平均连锁聚类法、系统聚类法、自组织特征映射法和模糊聚类等聚类算法，其中模糊聚类算法是首次用于基因表达模式分析．该软件同时具有数据过滤、多种相似性度量选择、聚类方法选择和结果可视化等功能．对于同一组基因表达数据，可通过不同的聚类算法的组合，提供更多的基因分类信息，为生物体复杂的基因表达模式研究提供了一个重要的综合分析平台．     

基于蚁群算法的模糊C-均值聚类算法

提出了一种基于蚁群算法（ACG）的模糊动态C-均值聚类算法的声纹识别，该算法首先利用蚁群算法的较强处理局部极值的能力，克服了算法在选取聚类中心点时采用随机选取易使得迭代过程陷入局部最优解的缺点，动态地确定了聚类中心和数目.两者有机结合起来可以寻求到具有全局分布特性的最优聚类.将此算法运用于声纹识别上，从语音信号中提取待识别的特征矢量集，对待识别声纹信号进行识别.实验证明，该算法解决了算法对初始值敏感，易陷入局部最优的问题，且计算简单，识别率较高，具有较好的鲁棒性.     

基于蚁群聚类算法的模糊神经网络

提出了一种基于蚁群聚类的模糊神经网络算法,神经网络采用RBF网络结点结构,聚类采用二级结构蚁群聚类算法作为一级聚类而模糊C-均值聚类(FCM)用于二级聚类。将上述聚类方法用于模糊神经网络构建中,仿真结果表明具有并行实时性、聚类能力强的特点。     

基于神经网络的语音识别系统

介绍一种适用于实时语音识别环境下的神经网络模型——动态识别神经网络（dynamic recognition neural network，DRNN）．DRNN聚类学习的性能使得它非常适用于与在线学习方式相结合的实时语音识别系统．通过比较DRNN和隐含马尔科夫模型（hidden Markov model，HMM），可以看到不论是在训练方面还是在识别方面，DRNN算法的计算复杂程度都要低于HMM算法．     

改进的神经网络快速学习算法

提出了一种新颖的神经元模型和用于神经网络训练的推广准则，给出了多层神经网络的快速学习算法，研究了一种用于语音识别的时变多层神经网络及其相应的快速学习算法．语音识别实验表明：所给出的快速学习算法能有效地加速网络训练进程．     

基于模糊C均值和BP神经网络的遥感影像自动分类算法

针对非监督分类算法分类精度不高、监督法分类算法的训练样本需要人工选择且容易误选的问题,提出了一种基于模糊C均值聚类(FCM)和BP神经网络相结合的遥感影像自动分类算法。首先利用FCM对影像进行初始聚类,然后根据聚类结果,由该算法自动选取其中的纯净像元作为训练样本,并送入BP网络进行学习,用最终训练得到的BP神经网络分类器对TM遥感影像进行分类,实验结果表明该算法具有较高的分类精度,能够满足大尺度地物类别判定的需要。     

基于改进的模糊聚类RBF网络集成的文本分类方法

Web文本分类是数据挖掘研究的一个热点问题.针对文本向量维度过高的特点,提出一种改进的模糊聚类RBF网络集成的文本分类方法,该方法利用模糊C均值聚类算法对文本特征向量进行简化、抽取,引入自适应遗传算法优化RBF神经网络的权值,构建RBF网络集成模型对文本进行分类.实验结果表明,该方法具有更高的分类效率和正确率.     

基于蚁群算法的模糊C-均值聚类算法在声纹识别中的应用

提出了一种基于蚁群算法(ACG)的模糊动态C-均值聚类算法的声纹识别,该算法首先利用蚁群算法的较强处理局部极值的能力,克服了算法在选取聚类中心点时采用随机选取易使得迭代过程陷入局部最优解的缺点,动态地确定了聚类中心和数目.两者有机结合起来可以寻求到具有全局分布特性的最优聚类.将此算法运用于声纹识别上,从语音信号中提取待识别的特征矢量集,对待识别声纹信号进行识别.实验证明,该算法解决了算法对初始值敏感,易陷入局部最优的问题,且计算简单,识别率较高,具有较好的鲁棒性.     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~