基于加权策略的SVM多元分类器

多元分类器通常需要在训练时间和分类精度之间折衷.提出了加权阈值策略和一对多分类方法的改进算法 OVA WWT，以增加结果融合的公平性，从而提高分类精度.基于OVA WWT策略和SVMlight二元分类器，实现了基于SVMlight的多元分类器MSVMlight.在CWT100G数据集进行的实验表明，该分类器具有较高的分类精度以及较短的训练和分类时间.相同的数据集上的阈值策略选择实验也说明了加权阈值策略能提高分类精度.     

基于多分类器融合的语音识别方法研究

针对语音识别性能提高的问题,提出了一种基于多分类器融合的语音识别方法,该方法使用支持向量机(support vector machine,SVM),RBF神经网络与贝叶斯网络作为成员分类器,根据样本库中抽取的校验集计算各成员分类器的权值,以加权评分的投票策略进行决策融合.实验结果表明,通过多分类器融合的识别结果明显优于...     

一种基于强属性限定的加权贝叶斯分类器

朴素贝叶斯分类器是一种简单而高效的分类器,但它的条件独立性假设使其无法将属性间的依赖关系表达出来,影响了它分类的正确率,加权朴素贝叶斯是对它的一种扩展.基于强属性限定的贝叶斯分类器SANBC,通过在强弱属性之间添加增强弧以弱化朴素贝叶斯的独立性假设,扩展了朴素贝叶斯分类器的结构;结合加权朴素贝叶斯和基于强属性限定的贝叶斯分类器SANBC的优点,提出一种基于强属性限定的加权贝叶斯分类器WSANBC;实验结果表明,WSANBC分类器具有较高的分类正确率.     

一种选择性的加权朴素贝叶斯分类器

朴素贝叶斯分类器是一种简单而高效的分类器,但它的条件独立性假设影响了它分类的正确率.加权朴素贝叶斯是对它的一种扩展.通过分析属性相关性的度量和属性约简,选择一组最近似独立的属性约简子集,并结合加权朴素贝叶斯和选择性贝叶斯分类器的优点,提出一种选择性的加权贝叶斯分类器SWNBC.实验结果表明,与朴素贝叶斯分类器相比,WSANBC分类器具有较高的分类正确率.     

基于特征加权模板快速提升的AdaBoost车牌字符识别算法

针对国内车牌字符的多样性和识别效率不高的现状,文中利用模板匹配和集成学习思想设计了一种新颖的识别算法．该算法由特征加权模板的方法构建弱分类器,经AdaBoost快速提升成强分类器,利用图像的整体灰度信息,缩短大量Haarlike特征的训练时间,克服单一特征弱分类器的不稳定性．仿真实验表明,该算法能够获得较好的字符识别率和稳定性．     

基于复杂网络的分类器融合

分类器融合指使用一系列学习器进行学习得到个体分类器,并使用某种规则把各个学习结果进行整合从而获得比单个学习器更好的学习效果。结合统计机器学习理论及复杂网络分析技术,提出了一种基于复杂网络的分类器融合算法。该方法利用“边”（个体分类器输出的共现关系）的先验分布信息及个体分类器对新样本输出的共现关系信息,计算新样本属于各类别的后验概率。     

基于通道和帧级特征注意力模型的环境声音识别

本文提出基于通道和帧级特征注意力的环境声音分类卷积神经网络模型。模型选择一维卷积对环境声音的二维对数梅尔谱特征进一步提取有效特征,再采用SE-Res2Net模块实现对浅层输入特征细粒度上的全局感受并获得通道注意力分数。在全连接层之前加入注意力统计池化,对输入的通道加权特征在帧级特征上施加注意力机制,获得不同时刻的帧级特征的重要度分数,加权计算后将不同通道的平均值μ和方差σ串联作为输出。采用Urbansound8K数据集对模型进行评估,实验最终在测试集达到94.5%的准确率,其表明本文所提模型可以学习到不同类声音的关键特征并正确分类。为进一步证明模型性能进行消融实验,分析实验结果可得对声音特征施加通道和帧级特征的注意力机制可使模型分类错误率的下降率为43.8%。     

基于置信度加权的INS／BD／GPS组合导航信息融合

针对联邦卡尔曼滤波算法存在的不足,将标准卡尔曼滤波方法和置信度加权方法相结合,应用于组合导航系统.该方法利用了自适应神经网络模糊推理技术非线性、快速实时、自适应学习的优点,将滤波器的输出数据进行置信度判别,得到各个子系统加权值,最后进行加权融合得到全局输出.仿真结果表明:基于ANFIS神经网络置信度加权的组合导航信息融合技术在一定程度上抑制了数据的发散,提高了导航精度.     

使用模糊加权距离的模糊K—近邻算法

本文用自定义的模糊加权距离代替K—近邻分类器中的明氏距离,这种替代突出了每一样本中占有优势的特征分量对距离的贡献。仿真实验及实用结果表明这种替换可进一步改善分类器的性能。     

加权超1-依赖贝叶斯分类器在柴油机故障诊断中的应用

在传统贝叶斯分类方法基础上,通过计算每个超1-依赖分类器与其相对应的朴素贝叶斯分类器的差异性来对超1-依赖分类器进行加权,提出一种超1-依赖分类器的度量方法,并将该算法运用到Dewetron燃烧分析仪采集到的柴油机故障数据分类诊断中.实验证明,该算法在柴油机故障检测上较传统加权超1-依赖算法有较稳定的精度提升.     

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

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