基于SocketAsyncEventArgs的远程监控系统通信服务器设计与实现

采用.NET的Socket Async Event Args类实现了高性能通信服务器.服务器采用连接池和缓冲池异步接收远程终端发送的信息,并按照约定通信协议对接收的信息进行过滤和处理,存入相应的数据库.针对无线远程监控系统的实际需求,提出了无线远程监控系统的逻辑模型,分析了通信服务器的功能和结构,讨论了通信服务器软件设计和实现的关键技术.测试结果表明,服务器能够高效准确地处理来自客户端的大规模并发连接请求,具有一定的通用性.     

基于SIP的视频监控服务器设计

设计和实现了一个基于SIP的视频监控系统,将会话发起协议(SIP)用于视频监控系统的信令控制,并对构成系统的两个主要组成部分:视频服务器和客户端做了介绍.视频服务器采用ARM+DSP的双核处理器结构,完成了音视频数据的采集、编码、压缩和网络传输等任务;客户端采用Windows平台开发,主要实现音视频数据的接收、管理、存储和提供用户对数据的访问界面等功能.双方的信令控制部分采用SIP协议实现,阐明了其设计思路及实现方法.     

基于ARM的远程实时视频监控系统的研制

为解决传统车辆监管系统不能对行驶中车辆实时视频监控的问题,研制了一套基于ARM11的远程实时视频监控系统.系统采用了基于客户机/服务器（C/S）结构的整体设计方案,在车载客户端完成车辆信息的采集、视频信息的压缩编码,通过3G无线网络将数据发送到远程服务器,在服务器实现实时显示.实验表明,系统运行稳定,服务器可以获得良好的视频质量和定位精度.     

基于TCP/IP协议的小动物PET数据传输系统的设计与实现

为了实现小动物PET系统数据高速传输的可靠性,采用TCP/IP协议对数据进行传输模拟.通过分析客户端/服务器模式控制数据的发送与接收,优化了客户端的处理能力,响应时间快;降低了系统的通讯开销,提高数据传输的安全性与可靠性.     

基于组播的视频信息传输技术研究

组播传输技术能够实现一点对多点的数据通信．在视频监控系统中，常常遇到一个视频服务器同时向多个客户端传输相同的实时视频信息．为了有效地利用网络资源，可以采用组播传输技术来实现实时视频信息的传输．论述了组播传输技术的原理和相关的路由协议，设计了一个视频信息的采集系统，分析了实时视频信息组播传输网络．讨论了Simulcast技术和分层组播技术，用来改善客户端接收的视频质量．     

Android平台远程视频监控系统的设计与实现

基于Android平台,设计一套远程视频监控系统.该系统由客户端和远程端构成,客户端基于Android平台的Socket通信、界面绘制、MJPEG视频解析等技术开发;远程端通过ARM9硬件系统采集处理图像、发送视频数据、接收并执行指令等.对该系统进行测试,结果表明,用户使用客户端可以实时视频监视远程端周边环境,通过图形界面遥控远程端机械载体;远程端能够采集视频回传至客户端,并根据客户端指令移动位置、变换视角.系统对无线网络适应能力较强、监控界面方便友好、可扩展性较高,能满足远程视频监控需求.     

基于IOCP技术的换热站监控系统实现机制研究

通过GPRS无线网络对远程换热站的实时监控是换热站监控系统的核心工作,针对目前网络通讯中单CPU多线程数据传输出现的数据丢包问题,本文提出了一种基于IOCP技术的通信模型,该模型对原有的模型进行改进,将多CPU多线程的数据传输方法融入系统传输结构中,实现了对网络通讯的优化,同时克服了Socket网络编程中线程上下文切换的弊端,提高了数据的传输效率,达到了进一步减少数据包丢失的目的.经过实验证明基于IOCP技术的换热站监控系统能够有效地减少数据包的丢失,提高换热站监控系统的总体性能.     

基于Java C/S模式的工业数据在线监测软件设计

基于C/S模式和ZigBee网络,采用Java编程语言设计了一款工业生产信息在线采集和管理软件系统.编制了串行数据通信协议,分别采用五线程和三线程设计了服务器和客户端软件.系统具有跨平台的特点,不受操作系统的限制,安全性较高.     

WebSocket服务器推送技术的研究

采用传统的＂请求—应答＂模式,使用户从互联网中得到有用的数据信息非常困难,如果互联网可以主动将有用的信息发送到客户端,将会跟用户带来很大的帮助。笔者提出了一种服务器推送方案,该方案使用了基于WebSocket协议的服务器推送技术,还利用了复杂事件处理技术对数据进行快速处理。这种方案可以运用到即时通信系统、股票交易系统、即时订票系统、监控系统等多种实时系统中。     

基于Web Services的电子警察集成平台设计与实现

随着智能交通监控技术的发展,各种电子警察监控系统越来越多地运用到公安交通管理中。电子警察集成平台采用Web Services技术实现了一组标准的WEB服务,在统一各电子警察客户端的连接规范的同时,充分利用WEB服务的特点,有效地提高了客户端接入数量,同时设计了异步数据传输方法,可以解决因客户端数量增加而导致的性能和稳定性下降等问题。可扩展系统架构可以提高WEB服务器的处理性能以解决可能出现的WEB服务器性能瓶颈。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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