基于免疫RBF神经网络和频谱分析的船舶电气设备的故障检测

用免疫策略算法和频谱分析的方法来构造和训练RBF网络.采用有监督的学习方法来选择网络基函数的中心,有效地减少了隐层单元的个数,从整体上提高了RBF网络的性能.仿真算例表明,该算法有较高的故障诊断率.     

一种新的RBF神经网络学习算法

本文提出一种改进的RBF神经网络学习算法,它利用减聚类算法确定隐层单元的数量,并用修剪的办法删除冗余单元,避免了传统的K聚类算法对隐层单元数量确定的盲目性。利用最小二乘法确定隐层和输出层之间的权值。在对非线性函数进行逼近的仿真中,验证了该算法的有效性。     

基于超长方体与KNN的分类算法

提出了超长方体与KNN相结合的分类算法.在训练阶段,该算法为训练集中的每一个类别构造多个超长方体,区域分离每一类训练样本.在测试阶段,该算法首先检查测试样本是否被某一个超长方体包围,如是则其类别被识别出,否则用KNN方法确定其类别.实验采用四个真实数据集进行测试.实验结果表明基于超长方体与KNN的分类算法在四个数据集全部优于两个基于多球覆盖的分类方法,是一种有效的分类方法.     

基于高斯基函数的小脑模型学习算法的改进

讨论了基于高斯基函数的小脑模型原理和学习算法,在文献「２」的算法基础上,定义了包含学习样本点的一个起立方体子空间,提出了在于该超立方体子窨的快速学习算法,仿真表明学习算法速度较文献「２」的算法有明显提高。     

结构化P2P网络中关键字搜索算法

为了解决分布式哈希表(DHT)不支持模糊匹配和查找延迟长等问题,提出使用改进的超立方体互连圈结构建立逻辑的关键字搜索层.对于给定的文档和描述该文档的关键字集合,使用反向文档索引(IDF)技术选择文档的重要关键字,并映射到环标号,将描述文档的关键字集映射到立方体标号,有效地提取了关键字对于文档的重要性信息,并通过构造生成树来实施搜索操作.实验结果表明,与使用超立方体结构作为关键字搜索层的算法相比,该算法在查询关键字较少时,具有更好的性能.     

一种基于神经网络算法的非线性PID控制器

针对非线性、不确定时滞对象,提出一种基于神经网络算法的非线性PID控制器。该控制器将传统PID的比例、积分和微分参数分别构造成关于误差信号的非线性函数,并将非线性比例运算单元、非线性积分运算单元和非线性微分运算单元分别作为隐层神经元的激励函数,从而构造将PID控制与神经网络控制融为一体的智能控制器。研究结果表明:采用此智能控制器有效解决了传统PID难以控制非线性对象的问题以及传统神经网络控制器隐层神经元节点数难以确定的问题,仿真结果验证了该智能控制器的有效性。     

一种优化多层前馈神经网络中隐节点数的算法

多层神经元网络中隐含层的层数及其每一层的神经元数的多寡，至今仍无法用一个解析式精确求得，提出了一种基于黄金分割法的算法，用于求解三层前馈神经网络中的隐层节点数，所得结果有助于提高三层前馈神经网络整体品质。仿真结果表明该算法能较快地找到较优的隐层节点数。     

基于剪枝极限学习机的表情识别

为了缩短神经网络方法在人脸表情识别训练阶段所消耗的时间,提出了一种基于剪枝极限学习机的人脸表情识别方法.该方法随机为输入层与隐层单元间的连接分配权重,并以此求出相应的隐层单元与输出单元之间的连接系数,以达到一次性确定神经单元间系数的效果,避免了深度学习和神经网络因反复修改网络系数造成的高耗时;接着利用隐层单元与分类结果的相关性,删掉那些相关性较低的隐层单元,从而自动构建网络结构;通过多次迭代选取分类结果最好的网络参数作为最终的网络参数;最后构建多个极限学习机,用投票机制实现最终的分类.实验结果表明,该方法在特定人脸识别和非特定人脸识别都能得到较好的识别率,且大大降低了训练所用时间.     

基于高斯基函数CMAC模型的一种快速算法

广义小脑模型（ＣＭＡＣ）在函数泛化能力和函数逼近能力方面优于基本ＣＭＡＣ模型,但算法较为复杂,实时性差．因此,研究广义ＣＭＡＣ模型的快速算法,对于满足实时控制是非常必要的．文中研究了基于高斯基函数的广义ＣＭＡＣ模型的快速算法,定义了包含待学习样本点的一个超立方体子空间,提出了基于该超立方体子空间的快速学习算法．通过算例仿真表明,学习算法收敛速度较快,可以满足实时控制要求．     

LSB Matching的嵌入效率分析

为了提高LS Bmatching算法的嵌入效率，提出了使用完全覆盖集的隐写方法。建立了基于完全覆盖集的隐写方法的理论框架，使用将像素点分组的方式对每组像素点来嵌入信息，同时保证了在嵌入过程中每点像素值最多改变1。给出了基于不同参数的完全覆盖集的具体例子以及与之相应的隐写方法的嵌入效率。计算结果表明：由完全覆盖集所给出的隐写方法能够显著提高LS Bmatching的嵌入效率。     

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     

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~~