多媒体数据压缩技术探讨

在简单介绍了数据压缩编码方法的基础上，对当前流行的多媒体数据压缩编码标准进行了分析，最后对多媒体数据压缩的应用前景和发展趋势进行了初步的探索和展望．     

用人工智能和神经网络的方法组建数据压缩系统

数据压缩是现代信息处理的基础课题之一．文中对数据压缩的设计思路作了分析和拓展，从系统的角度对数据压缩与人工智能、神经网络的结合作了一些大胆的、初步的尝试，并对这个研究方向作了一些功能上和性能上的分析，提出了再压缩的概念．     

浅析数据压缩技术

首先介绍数据压缩技术发展的历史，接着阐述了数据压缩的原理及其内容，最后就数据压缩技术分类和压缩技术的编码进行分析与研究。     

一种无损数据压缩新方法

数据压缩技术是计算机科学的一个重要分枝。在数据压缩的前提－数据冗余的基础上，构造了一种无损数据压缩算法，阐述了其实现机制，并讨论了此算法的时间复杂性和最不利情况下的负作用。     

高阶细胞自动机新的数据压缩方法

构造出高阶置换映射，进而得出更有效的高阶细胞自动机超并行数据压缩方法，与细胞行动机超并行数据压缩方法相比，其处理速度可以成倍地提高。证明了用遗传进化算法得到的高阶细胞自动机元胞级无失真数据压缩规则的正确性和可行性。并推广到任意阶，给出了对应的置换映射，之后讨论了有关的时间复杂性及高阶数据压缩方法的有效性。     

浅析多媒体数据压缩技术

文章介绍了数据压缩的必要性、可行性,数据压缩的概念、常用压缩方法和典型算法,并指出了数据压缩的广泛应用。     

细胞自动机超并行数据压缩方法

提出细胞自动机元胞级超并行无失真数据压缩方法，并用遗传进化算法获得细胞自动机中的数据压缩规则，证明了细胞自动机文本压缩规则的正确性，讨论了有关的时间复杂性及符号动力学特性。与其他传统的串行或小规模并行的数据压缩方法相比，本文的方法有更好的实时性，普适性，以及Ｓｙｓｔｏｌｉｃ硬件实现的可行性。     

数据压缩处理的方法与技术

数据压缩处理技术在计算机技术的萌芽时期就已经被提上议事日程,随着信息论的产生和发展,数据压缩也由热门话题演变成真正的技术。在计算机领域中,数据压缩主要运用在多媒体通信中。本文主要从数据压缩的模型建立与编码原理上阐述数据压缩处理技术。介绍了熵、信息熵的基本概念、数据压缩模型的建立的过程,同时介绍了编码原理和应用,特别是Huffman编码原理和应用。     

多媒体数据压缩技术

图像的数据量非常之大,多媒体数据压缩是一个关键技术.数据压缩可以实现实时有效地处理、传输和存储庞大的多媒体数据,本文主要介绍了多媒体数据压缩的方法和多媒体数据压缩国际标准JPEG、MPEG和H.261.     

改进的矩形波串算法及在过程数据压缩中的应用

阐述了DCS系统中过程数据压缩的作用及特点，提出一种改进的矩形波串过程数据压缩方法，给出离线压缩、在线压缩及信号重现算法，通过实际数据进行离线仿真并分析算法的性能，同时介绍该算法在现场总线控制系统中的应用。     

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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