改进的DAGSVM手势识别方法

在现有支持向量机多分类方法基础上,提出了一种改进的有向无环图支持向量机(DAGSVM)手势识别方法.分析了传统有向无环图支持向量机分类器生成顺序随机化的不足,引入类间距离和类的标准差作为生成分类器的测度.利用Kinect获取场景深度信息得到手势图像,提取手势特征并训练SVM分类器,并采用改进后的方法得到DAGSVM分类器.实验证明:与其他支持向量机多分类器相比,改进后的DAGSVM分类器能够达到更高的识别率,将这个手势识别方法用于智能轮椅的控制上,取得了良好的效果.     

基于AP算法支持向量机的设计与应用

设计一种基于AP聚类算法和SVM分类器相融合的新的混合分类器, 使用AP聚类算法优化数据集, 得到了高质量、 小样本的SVM分类器训练集. 实验结果表明: 与传统的SVM分类器相比, 混合分类器具有更高的分类精度; 在心脏病预测上, 该分类器的效果较好.     

支持向量机在地层识别中的应用

以径向基函数RBF为核函数,根据测井数据建立支持向量机的地层识别模型(SVMM).通过对SVMM分类器中惩罚参数C的优选,结合生产工程需要引入判断函数,提高了SVMM分类器的分类正确率.试验表明:SVM分类器应用在地层识别中效果良好,而且具有广阔的应用前景.     

利用表面肌电进行手势自动识别

针对手势自动识别研究中提高正确率和降低训练时间两者需要同时兼顾的问题,提出了一种基于Fisher Score(FS)特征降维方法与机器学习相结合的新的手势识别模型。提取4通道表面肌电信号的时域、频域、时-频域和非线性特征,构成特征集;采用FS方法和主成分分析(PCA)方法分别进行特征降维,采用线性判别分析(LDA)和支持向量机(SVM)分别作为分类器;通过两种特征降维方法与两种分类器的不同组合构建不同的手势识别模型,并对分类模型的性能进行对比研究。实验结果表明,特征降维方法与分类器的组合能显著提高分类器的正确率、降低训练时间。与PCA方法相比,FS方法是一种实现简便、效果理想的特征降维方法:与SVM组合的分类模型获得最高分类正确率99.92%;与LDA组合的分类模型不仅获得99.24%的分类正确率,而且花费最短的训练时间1.44ms,该模型可为手势的实时自动识别提供理想的方法和途径。     

基于一类SVM的贝叶斯分类算法

提出一种基于一类支持向量机(one-class SVM)的贝叶斯分类算法,该算法用一类SVM对类条件概率密度进行估计以构造贝叶斯分类器. 证明采用高斯核的一类SVM,其解可以归一化为密度函数,并把该密度函数看作类条件概率密度的平滑估计,构造贝叶斯分类器. 实际数据集上的实验结果表明,提出的分类算法测试准确率高于简单贝叶斯分类器与贝叶斯网络分类器,不低于传统二类SVM;比传统二类SVM需要计算的核矩阵规模更小,训练时间更短.     

基于SVM多类分类算法的模拟电路软故障诊断

给出了基于支持向量机(SVM)1-v-1和决策导向无环图(decision directed acyclic graph,DDAG)多类分类算法的模拟电路软故障诊断新方法.DDAG是在1-v-1算法基础上构建的新的学习架构,在对多个SVM子分类器进行组合的过程中,引入了图论中有向无环图的思想.比较了采用不同核函数时支持向量机的分类结果.实验结果表明采用DDAG支持向量机(DAGSVM))多类分类算法时,诊断准确率为99%.因此,DAGSVM算法具有较高的诊断准确率.     

改进的SVM决策树分类算法

为解决多类分类问题,在分析SVM决策树分类器及存在问题的基础上,通过引入类间可分离性测度,并将其扩展到核空间,提出一种改进的SVM决策树分类器。实验表明了该分类算法对提高分类正确率的有效性。     

使用增量SVM进行文本分类

针对传统SVM无法适应文本数据库随着时间不断更新的问题,通过对新增文本集的KKT条件的分析,研究了加入新增文本集后支持向量集的变化,提出了使用增量SVM进行文本分类的算法,并通过实验验证了通过该算法得到的分类器和传统分类器有着相似的分类能力和泛化能力.     

云计算环境的并行支持向量机

针对基于GPU和MPI并行的支持向量机（SVM）算法不适合于云计算环境,设计了一种基于多级SVM的并行支持向量机模型,实现了云计算环境下的序列最小优化（SMO）的并行算法。该算法通过MapReduce系统将大规模训练数据集划分为若干小训练集,再由这些小训练集开发多级的SVM,最后收集每一个SVM最优超平面附近的样本数据来训练另一个新的SVM。实验结果表明,该算法在时间消耗与分类正确率等综合方面比单机算法和传统并行算法获得更好的效果。     

基于支持向量机的脑电信号分类方法研究

针对传统支持向量机分类方法在脑电信号处理中存在分类正确率低的问题,将聚类思想与二叉树支持向量机(SVM)结合,构造多类SVM分类器。实验以"BCI Competition 2005"中的Dataset IIIa为例,先对C3/C4导采集的四类运动想象脑电信号应用小波变换进行去噪。再在分析小波包频带划分特点的基础上,利用小波包进行分解与重构,获取相应的能量特征。最后应用改进后的SVM分类方法对特征信号进行分类。结果表明该方法分类正确率,可以达到91.12%;并且有效地减少了分类器的个数,最终达到较好的识别效果。     

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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