基于Windows CE下JPEG图像的压缩技术

在Windows CE系统下利用离散余弦变换,哈夫曼编码实现了JPEG图像压缩与解压缩.介绍了IJG组织提供的JPEG 库来验证JPEG压缩与解压缩算法在Windows CE下的应用;最后通过与IImage组件比较,结果表明,自定义的JPEG图像处理达到的效果与IImage组件相当,而且更具有可扩展性.     

基于ROI的多分辨率网格框架的图像检索

提出一种新的基于ROI(regions of interesting)的多分辨率网格框架的图像检索方法.先利用网格对图像进行分块,并利用小波变换对分块进行多分辨率分析,以提取图像各分块的颜色和纹理特征信息,然后根据用户指定的感兴趣的区域得到查询子图,最后使用一种融合子图(integrated sub-images matching, ISM)的匹配方法进行图像检索.通过对比实验,证明该方法能够有效地得到降低图像检索的语义鸿沟,并取得很好的检索效果.     

基于ROI的多分辨率网格框架的图像检索

提出一种新的基于ROI(regions of interesting)的多分辨率网格框架的图像检索方法。先利用网格对图像进行分块,并利用小波变换对分块进行多分辨率分析,以提取图像各分块的颜色和纹理特征信息,然后根据用户指定的感兴趣的区域得到查询子图,最后使用一种融合子图(integrated sub-images matching,ISM)的匹配方法进行图像检索。通过对比实验,证明该方法能够有效地得到降低图像检索的语义鸿沟,并取得很好的检索效果。     

基于WinCE的遥感图像应用平台软件的研发

采用小型智能终端多普达P100 PDA为硬件环境,使用嵌入式操作系统Windows CE 5.0,将遥感图像数据、数字栅格地形图(DRG)数据和矢量数据集成到小型的智能终端(PDA GPS)上,实现了GPS粗定位、数据显示、标注等一系列功能,解决了PDA设备对大数据量图像访问的问题,优化了GPS定位精度。     

一种显示JPEG和GIF格式图像的简便方法及实现

JPEG和GIF格式图像在保证图像显示质量的条件下同时兼有较高的压缩率，从而得到了广泛的应用．用JPEG和GIF格式图像替代没有任何压缩的BMP格式图像在Visual C 中的应用，降低了程序的时空开销．以JPEG格式图像的显示为例，介绍一种利用IPicture的COM接口显示此格式图像的简便方法及实现，并给出了相应的显示结果．     

基于块效应的JPEG图像无参考质量评价

根据JPEG压缩图像产生的块效应,提出了一种简单的JPEG图像无参考质量评价方法。首先找出JPEG图像相邻失真块的边界位置,然后计算相邻块边界像素灰度差值的平方,同时累计边界像素的个数,最后利用简单的公式直接得到JPEG图像无参考质量评价值。对LIVE和TID2008数据库中.JPEG图像进行了实验,客观值与主观评价间的线性相关系数分别达到0.924 4和0.937 3。实验结果表明:该方法对不同的图像有良好的适应性。     

基于车载视频监控系统的设计

本文着重探讨了基于ARM9内核和Windows CE平台的图像采集、数据传输系统的设计,完成了USB摄像头驱动软件的开发,并提出了Windows CE平台下通过USB转CAN总线来提高数据传输以便远距离实时显示图像数据的方法,最终实现了Windows CE平台下视频图像的采集、传输和显示。     

复杂组合气道三维分块结构化贴体网格的生成

给出了螺旋与切向气道相组合的进气系统结构网格生成的一种拓扑分块方案及实现过程,求解椭圆型方程生成各块内三维网格,用Hilgenstock方法修正源项,并利用分块粘接技术生成了组合进气管道三维分块结构化贴体网格．计算算例表明该网格拓扑分块方案以及生成方法可以对组合气道流场的流动进行较好地模拟．     

混淆和扩散相结合的图像混沌加密方法

为了提高算法抵御统计分析和差分攻击的能力,提出一种改进的基于混沌的图像加密算法。首先将原图像做分块处理;然后采用基于位运算的像素混淆算法对图像块进行处理,使每个分块图像内的所有像素充分扩散到其他各个图像块中,有效地削弱了图像相邻像素相关性。最后采用像素扩散操作能有效提高算法抵御已知明文攻击的能力。实验结果表明,该算法不仅密钥敏感性强,而且比均匀置乱和二维混沌加密算法具有更强的抵御差分攻击的能力。     

针对二值图像分块奇偶密写的统计分析

一种实现简单的二值图像密写方法是将图像分为2×2的小块后利用边缘块的奇偶性来隐藏秘密信息.将含密图像以不同行列作边界分块时,图像块像素和的直方图存在明显差异,且非边缘块的数目变化较大.这一异常会暴露秘密信息的存在.通过将含密图像错位分块后作二次密写,并统计不同分块方式下非边缘块数目的变化量,可估计出嵌入量.该方法容易实现,实验验证了该方法的有效性.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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