基于改进非参数核密度估计的光伏出力概率分布建模方法

针对非参数核密度估计方法应用于光伏发电出力概率建模中存在边界偏差和局部适应性不足问题,提出一种改进的非参数核密度估计光伏发电出力建模方法.将自适应核密度估计方法与基于伪数据法的核密度估计相结合,通过在估计区间外生成伪数据,将伪数据添加到边界附近以修正偏差,进而构建更加准确的光伏出力概率分布模型;应用交叉验证法计算最优带...     

关于ξ（s）零点密度的局部估计

本文利用指数对，Ｈａｌａｓｚ方法及ξ（ｓ）的均值估计对ξ（ｓ）零点密度估计中的一部分零点Ｒ１给出了一个近似估计公式，并得到了ξ（ｓ）零点密度局部估计的新上界。     

WOD随机变量的核密度估计（英文）

研究了WOD随机变量的核密度估计。首先建立了核密度估计在紧集上的指数不等式及收敛速度,其次得到了估计量的相合性的结果。研究结果推广了已有的相协和负相协的相关结果。最后通过数值分析来验证了核密度估计的收敛速度。此外,还提供了真实的数据分析。     

基于LRP的自适应运动目标检测算法

传统的运动目标检测算法主要基于像素值的统计模型,对于光照突变和噪声极为敏感.为此,提出了一种基于局部比率模式(LRP)的自适应运动目标检测算法.使用LRP描述视频图像序列中像素特征,通过自适应核密度估计对像素特征进行建模,提取出运动目标.实验结果表明,该算法适应光照变化,有良好的检测性能.     

杂系混合信号的盲分离

利用基于随机变量概率密度函数的非参数密度估计的核密度估计法对评价函数进行直接估计，改进了盲分离算法的性能，理论推导和试验都证实了这种基于核密度估计的非参数密度估计盲分离算法能实现包含超高斯和亚高斯信号的杂系混合信号的盲分离，为盲分离问题在实际问题中的应用奠定了一定的基础。     

正则半群的强局部左—C同余

本文给出了，强局部左－ Ｃ 半群的概念和它的两个等价条件，研究了正则半群的强局部左－ Ｃ同余，用同余核和同余的超迹，描述了强局部左－ Ｃ同余。     

金融问题中二元损失函数的核密度估计

用非参数估计方法,在一元函数的核密度估计的基础上,给出了二元函数的核密度估计形式,并通过计算估计量的MISE的最小值得出最优窗宽.     

基于核密度估计的性能退化数据建模分析方法

针对现有性能退化建模分析方中存在试验样本数据量少和先验分布假设过于严格的不足,提出了一种基于核密度估计的性能退化数据建模分析方法,并详细说明了进行核密度估计时最佳窗宽的确定方法.通过实际算例对建模分析方法进行了验证,结果表明:基于核密度估计方法能有效地克服试验样本数据量少和先验分布假设严格的不足,从而为该情况下产品的性能退化分析提供了一种新方法.     

基于除法模型和核密度估计算法的镜头径向失真校正方法

针对镜头径向失真的问题,提出了一种基于除法模型(DM,division model)和核密度估计算法的校正方法.该方法利用同一场景两个不同视点的失真图像对建立DM模型.首先对失真图像对进行特征点的提取和匹配.然后根据基本方程式联立方程组,采用核密度估计算法求出最优解即为校正参数.最后根据求得的校正参数对两幅失真图像进行校正.仿真表明,核密度估计算法提高了失真校正的鲁棒性和图像校正的精度.     

非参数核密度估计的Lr收敛

核密度估计是一种具有广泛应用领域的非参数统计方法．有关它独立情况下的大样本性质,在文献[1]中已详细介绍,本文在改进Parzen给出的一个基本引理的基础上得出非参数核密度估计的L^τ收敛．     

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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