基于DirectShow的电子监考巡视系统的设计与实现

针对巡视软件中多媒体应用的捕捉、回放等主要问题,运用DirectShow框架和DirectShowRTP架构实现了一个基于PC的电子监考巡视系统。该系统使用了COM组件技术,具有良好的可重用性和可扩展性。     

基于信道模式噪声的录音回放攻击检测

近来出现的高质量低价格的录音及回放设备的高保真度使人耳也难以分辨出原始语音和回放语音,这使得录音回放攻击对说话人识别系统的安全造成了很大威胁.为此,文中提出了一种基于信道模式噪声的录音回放攻击检测方法.该方法根据原始语音与回放语音信道的差异,针对不同信道中的录音及回放设备引入不同的信道模式噪声,采用去噪滤波器和统计帧分...     

多媒体技术中音频处理的数学模拟

论述了多媒体技术中音频处理的过程，对音频处理中的采样、量化及数据的回放过程给出了数学模拟。     

游戏动画中的动作捕捉

简述了动作捕捉技术的基本原理，分析了游戏动画制作中动作的特点及运用动作捕捉的技术难点．为了避免传统的动作捕捉方法在游戏动画制作中所遇到的精度与处理速度低的问题，从动作列表和跟踪点设置、布局设计以及动作编辑入手，对原有的动作捕捉的传统标准方法进行了改进．该方法首先对游戏动画动作进行分析，形成相关的动作列表，进而对人体模型树及人体自由度进行分析，得出优化后的跟踪点布局设计，最后在此基础上通过对人体关节树的分析及运动描述，实现动作编辑，从而实现了捕捉原理上的创新．并且给出了动作捕捉技术在游戏动画制作中应用的整体框架．     

电视台摄像师画面捕捉能力的重要性及强化对策探讨

在进行电视节目的真实拍摄期间,有时需要瞬时拍摄、即兴拍摄,所以,就要求摄像从业者具备较强的画面捕捉才能。摄像人员应不断提高自身的专业技能及综合素养,充分认识到画面捕捉的重要性,从而更好地捕捉到优质画面。该文简要分析了画面捕捉的概念及重要性,探讨了摄像人员捕捉画面所需的条件,并提出增强摄像人员能力的措施,目的在于确保摄像画面,为推动电视艺术做出贡献。     

柴油机微粒捕捉器捕集效率模型的研究

在深床微粒捕集效率经典理论的基础上 ,结合柴油机排气的特点 ,从宏观的角度建立了一个计算捕捉器内气流中的微粒分布及微粒捕集效率的基本数学模型 ,这个模型可以更确切地描述捕捉器内微粒的捕集过程及影响微粒捕集效率的各种因素 ,为柴油机排气微粒捕捉器的优化设计及进一步建立定量的捕捉器微粒捕集数学模型提供了基础 .     

基于单片机的语音存储与回放系统

提出一种基于单片机实现的语音存储与回放系统,介绍了系统的硬件原理与软件结构.以单片机AT89s52为核心部件,由供电电源、键盘、麦克风、前置放大器、A/D、D/A、后置带通滤波器、后置放大器、喇叭等组成.设计的语音存储与回放系统具有录制方便、回放灵活、无磨损、可靠性强等特点.     

索贝精彩回放服务器在天津广播电视台的应用

从天津广播电视台引进索贝MSV555-EX精彩回放服务器的行业背景出发,介绍了索贝MSV555-EX精彩回放服务器在天津广播电视台演播室信号回采、演播室录播节目制作与编辑、精彩片断制作与回放、垫片播出、背景大屏幕播出等方面的应用。指出该服务器应用于天津广播电视台,可提高新闻节目播出效率,同时可以节约大量人力、物力成本。     

语音存储与回放系统

提出了一种以８０３１单片机为核心的语音存储与回放系统，介绍了系统的组成及软、硬件设计方法。该系统结构紧凑，具有灵活的录音、放音功能；语音音量自动控制功能。采用体选ＲＡＭ的方法，扩大了存储空间，使语音存储时间可以达到十几秒。结果表明，在音频信号频率为３００Ｈｚ至３４００Ｈｚ范围内，系统噪声小，语音回放效果良好。     

导向钻井下行通讯地面监控系统设计

针对变钻井液排量进行导向钻井下行通信设计了地面监控系统:给出了下行通讯指令传输系统的组成及原理,并利用MATLAB的图形用户界面(GUI)设计了地面监控系统的主界面、信息回放和指令下传等界面,实现了井下采集的数据回放、曲线绘制.根据变钻井液排量指令特点及编码方式,实现了对下传指令的选择,并直观显示出选中的指令编码形式,完成对串行口通信参数的设置,实现下传指令的发送.     

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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