交织扩展Golay码编译码器实现方案的研究

论述了交织编码的工作原理，给出了一种交织扩展Ｇｏｌａｙ码的改进型软件设计方案，用ＴＭＳ３２０Ｃ２５实现了其编译码器并给出了模拟实验结果。实验结果表明，它能准确地纠正不大于７２比特位的差错；处理１２８×１２８×８比特位的一幅图像数据的运行时间为０．４１２ｓ。     

用FPGA实现图像采集的控制

提出了一种基于ＦＰＧＡ的具有计算机接口的灵活的图像采集系统．在ＦＰＧＡ模型中集成了采集计数器、时钟控制、ＤＭＡ信号发生器和Ｉ／Ｏ接口逻辑等功能模块,相当于４０多个７４ＬＳ系列芯片．由于现场可编程逻辑阵列的灵活性,系统可以很方便地实现ＣＩＦ,ＱＣＩＦ,２５６×２５６和１２８×１２８等多种图像格式的采集．     

活动图像实时采集的实现

研究了运动图像的实时采集方法，提出采集系统的工作原理及主要时序，对各种图像源的信号，都能一次连续采集３２幅１２８×１２８的活动图像，均有满意的结果，实验表明，按本法设计的采集板有良好的实时性，通用性强，成本低，可ＩＢＭＰＣ及兼容计算机，应用范围广，可扩充到６４幅图象或更多。     

采用时间和频率交织的COFDM系统在COST 207频率选择性衰落信道下的性能研究

根据欧洲科学与技术研究协会207工作组标准，讨论了由信号传输的时延和时变性引起的频率选择性衰落信道的建模方法；分析了采用比特交织和符号交织相结合的COFDM在这种信道下的性能．仿真结果表明，采用合适的交织度和载波数，QDPSK在COST 207频率选择性衰落信道下能够获得最佳误码率性能．讨论了不同的多普勒频移下QDPSK-COFDM的性能．     

关于广义特征值的注记

在什么条件下，广义特征值为实数？［１］在Ｒｎ×ｎ中给出了一个充分条件。［２］在一定条件下给出了广义特征值的估计．本文在Ｃｎ×ｎ下给出广义特征值为实数的几个充分条件。并且在命题１和命题２中还给出广义特征值的估计。     

面阵硅场发射阵列的离子束刻蚀

利用光刻热熔法及氩离子束刻蚀技术制作１２８×１２８元面阵硅场发射器件,采用扫描电子显微镜（ＳＥＭ）和表面探针等测试手段分析所制成的面阵硅微尖阵列和硅微台（微环尖）阵列的表面微结构形貌特点．所制成的面阵硅微尖和硅微台（微环尖）器件的图形整齐均匀,达到了预定的各项指标的要求．实验表明,所采用的器件制作方法有较大的实用价值．     

3×3引理的推广及其应用

将Ａｂｅｌ范畴中的３×引理推广到３×３×３引理，并利用３×３×３引理给出了ｐ－除环上一系列矩阵秩的公式。     

符号交织串行级联CPM系统优化设计

针对符号交织串行级联CPM系统中外码性能越好,接收端迭代译码后系统性能反而越差问题,研究了一种新型的符号交织串行级联CPM方案,该方案结合符号交织和比特交织的特点,在译码时延几乎不变前提下,对每一符号帧映射前的比特信息序列进行比特置换优化.相比符号交织串行级联CPM方案,采用本文所提的优化方案,能加快接收端译码迭代收敛速度,同时外码的性能也可直接影响到符号交织串行级联CPM系统的性能.     

用B样条曲面设计船体曲面的一种实用方法

提出一种在矩形域ｍ×ｎ上用三次Ｂ样条曲面设计船体外形曲面的方法，并给出了流程图和计算实例．     

较弱条件下线性回归系统回归系数协方差改进估计的弱相合性

对于由ｍ个相依的线性回归方程组成的线性回归系统：其中Ｙｉ为ｎ×１观测向量，Ｘｉ为ｎ×Ｐｉ列满秩矩阵，βｉ为Ｐｉ×１的未知回归系数，ｅｉ为ｎ×１随机误差向量，且σｉｊ≠０．［１］的作者分别在已知及未知的情况下给出了β１的协方差改进估计和两步改进估计β１，并在ε＝（ｅ１，…，ｅｍ）的各行相互独立同分布的情况下讨论了β１的弱相合性．本文在较弱条件下讨论β１及Ｂ１的弱相合性，从而推广了［１］中相应的结果．     

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