基于灰度共生矩阵和支持向量机的茶叶病害诊断研究

针对茶叶病害由于致病机理不同导致病斑纹理不同的特点,通过灰度共生矩阵来构造茶叶病害的纹理特征和将支持向量机应用到茶叶病害的识别方法;由于支持向量机是一个二分器,提出了投票最大策略建立SVM多分类识别算法。首先对茶叶病害的图像进行预处理以改善图像质量,然后利用灰度共生矩阵构造和提取了5种纹理特征,最后建立支持向量机多分类识别器并对茶叶病害进行识别。实验结果表明:利用灰度共生矩阵构造的纹理特征对茶叶病害的识别效果好;不同核函数的识别性能不同,径向基核函数比较适合茶叶病害的识别,识别率高达86.67%;不同样本数的识别性能不同,支持向量机在解决小样本的病害识别问题上有很好的识别能力,最低识别率达到70%,稳定性好。     

基于图片DCT域共生矩阵的图像拼接盲检测

通过对图像拼接技术的分析,提出了一种基于灰度共生矩阵的拼接图像检测算法.该算法把离散余弦变换(DCT)与灰度共生矩阵结合,计算图片DCT域上的灰度共生矩阵,将共生矩阵作为特征向量,采用特征提取 分类方法,利用支持向量机（SVM）分类器进行分类预测.实验结果表明,该算法在哥伦比亚大学灰度图片库和中国科学院彩色图片库上达到了91.2%和98.5%的最高检测准确率.     

基于模糊支持向量机的一维距离像识别

在毫米波雷达一维距离像识别中,为达到消除噪声与孤立点影响的目的,在研究了基于距离和样本紧密度的隶属度函数的基础上,提出了一种能反映雷达回波信号在特征空间分布的隶属度函数.用一个紧凑的超椭球体将样本包围起来,并使用超椭球体的方向半径度量样本之间的紧密度.将改进的基于样本紧密度的隶属度函数应用于模糊支持向量机中,可较好地区分开支持向量与含噪声或野值的样本.实验结果显示:随着雷达回波信号信噪比的降低,支持向量机的目标识别率迅速下降,而模糊支持向量机的目标识别率只下降了1%,有效地减小了噪声对一维距离像识别结果的影响.     

航空发动机孔探损伤识别方法

针对目前航空发动机孔探检测不能对损伤类型自动识别现状,将支持向量机与孔探检测技术相结合,提出基于支持向量机（SVM）的损伤图像识别方法。该方法将损伤图像进行二值化分割,利用链码跟踪及灰度共生矩阵分别提取损伤区域的形状特征和纹理特征,组成多维特征向量,输入支持向量机进行分类识别。分类器设计阶段,组建性能优越的二叉树支持向量机以减少训练样本,提高分类效率。CFM56发动机实验结果表明：该方法的识别性能明显优于传统SVM多分类器和BP神经网络方法。     

基于概率支持向量机的激光雷达风切变图像的识别

针对标准支持向量机在激光雷达风切变图像识别中无法提供后验概率这一问题,从有监督聚类的角度,提出一种基于FCM的概率支持向量机识别方法. 先利用灰度-梯度共生矩阵提取激光雷达风切变图像的纹理特征,再利用支持向量机确定分类面,最后利用条件约束和FCM确定各类样本距离分类面的概率分布. 实验结果表明,该算法对3种风切变的整体识别率可达到95.52%,与两种同类算法相比,识别率分别提高了1.27%和1.21%.      

基于SVM的图像分类研究

支持向量机（SVM）是一种优秀的分类方法,灰度共生矩阵（GLCM）是一种很好的纹理分析方法;本文研究了图像的颜色、纹理等特征对利用支持向量机进行图像分类的影响,提出了一种使用灰度共生矩阵进行综合特征提取的SVM图像分类方法。实验结果表明SVM方法的可行性和有效性,并得出图像综合特征的提取有利于分类效果的提高。     

基于SVM的图像分类研究

支持向量机(SVM)是一种优秀的分类方法,灰度共生矩阵(GLCM)是一种很好的纹理分析方法;本文研究了图像的颜色、纹理等特征对利用支持向量机进行图像分类的影响,提出了一种使用灰度共生矩阵进行综合特征提取的SVM图像分类方法.实验结果表明SVM方法的可行性和有效性,并得出图像综合特征的提取有利于分类效果的提高.     

一种新的浮选泡沫图像识别方法

针对灰度共生矩阵法提取的浮选泡沫图像纹理特征相互混叠,不利于聚类和识别的问题,提出一种基于正交保局投影和支持向量机的浮选泡沫图像识别新方法.该方法利用正交保局投影法对原始纹理特征参数进行变换处理,有效改变了不同类别特征参数的聚集程度,并利用支持向量机进行分类.实验结果表明,所提方法的正确识别率能够达到93.5%,与基于最近邻分类器的主元分析法相比,其性能更好.     

基于经验与灰度共生矩阵的花蛤辨识方法

为提高花蛤挑拣的效率,加快水产产业自动化生产步伐,提出一种基于经验和灰度共生矩阵的花蛤筛选方法。本方法属于无接触式辨识,在对工业相机采集到的图像进行预处理的基础上,截取并旋转单个目标图像,规范图像性质,采用统计学和灰度共生矩阵方法,提取花蛤或石头的纹理和形状等相关特征,运用支持向量机进行分类训练和测试。实验结果表明,本文所提出的方法可实现位置精准确定,选取的特征能较好地表示花蛤或石头,分类器算法高效简单,最终花蛤筛选识别率可达99%,可满足工业需求。     

基于支持向量机与多种特征的煤矸石识别

为了提高煤矸石分选的识别率,研究煤与煤矸石在同一场景下不同特征的数据差异;将煤与煤矸石各分为2类,从各类中抽取样本,经预处理后分析灰度特征、纹理特征、灰度分布直方图,以及不同阈值时各类样本灰度级为255的像素点频率;基于灰度特征与纹理特征,采用支持向量机对样本进行训练。结果表明,各类煤与煤矸石在灰度特征的灰度能量与灰度熵、纹理特征的能量与熵、灰度分布直方图特征以及阈值为55～70且灰度级为255时的频率存在明显差异,基于支持向量机与多种特征的煤矸石识别率最高可达96.4%。     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has