基于嵌入式Linux的移动互联网的实现

近年来，随着信息技术的飞速发展，特别是Internet的迅速普及，使3C(计算机、通信、消费电子)产品一体化趋势日趋明显，而嵌入式系统作为后PC时代的代表，也得到了极大的发展。其中，移动Internet技术是嵌入式系统高端应用中的一个重要方面。为了使嵌入式系统能够接入Internet，充分利用网络上的通信资源，本文介绍了在基于32位处理器的嵌入式Linux系统中，集成GPRS通讯功能以实现无线上网的设计方案及具体实现。     

单片机系统接入Internet设计中Embedded Web Server的实现

嵌入式Internet的设计中,Embedded Web Server的实现关键在于使系统支持HTTP(超文本传输协议),嵌入式HTTP服务器是控制网络的关键设备,也是实现设备Internet远程监控的关键技术,本论文对HTTP协议进行了分析,对任务函数进行了设计,实现了单片机系统接入Internet设计中Embedded Web Server的实现.     

基于μC/OS-Ⅱ的嵌入式网络接入技术研究

详细阐述了嵌入式网络接入系统的硬件结构、嵌入式实时操作系统μC/OS-II在51微处理器P87C52上的移植过程和系统软件设计方法.该系统一方面实现了通过TCP/IP网络协议接入Internet;另一方面提供了RS232与I2C等通信功能.这样,每个本地设备都可以通过此系统与Internet相连,而Internet中的其他主机也可以通过此系统对本地的各种设备进行控制,并给出了系统的测试结果.     

基于eZ80F91和Internet的远程测控系统

简要介绍了ZiLOG公司最新推出的高性能、高速eZ80F91单片机和TCP/IP软件协议栈(ZTP).描述了利用该MCU和ZTP构建嵌入式网络服务器WebServer的工作原理.实现了用户通过intrnet或Intemet对远程测控设备进行监控的功能.分析系统各部分的功能以及软件实现方法,给出硬件结构.本系统高效、低廉地实现了单芯片的Internet连接功能,具有广泛的应用前景.eZ80F91特别适合工业自动化、通信、安全和嵌入式Internet应用.     

基于WinCE的嵌入式家居系统

针对现有住宅家庭自动化的实现,提出了一种既经济又方便的方案.其中基于WinCE的嵌入式系统为主控系统、单片机组成外设.嵌入式平台通过电力线载波通信技术与基于亮度变化检测的防火模块、热舒适节能型空调模块以及其他各种终端家电模块间进行通信与控制.此外,系统还具有手机短信控制和Internet网络控制两种远程控制方式.     

嵌入式电子邮件系统的研究与实现

电子邮件是Internet上最早出现的服务之一.随着嵌入式产品与Internet的迅速融合,嵌入式电子邮件系统的开发也就势在必行.设计了嵌入式电子邮件收发系统,详细介绍了它的结构以及各个功能模块的实现过程.该邮件系统按照SMTP和IMAP4协议的规范,实现了邮件系统的收发功能.系统逻辑清晰,界面友好,便于使用.     

uClinux嵌入式系统中GPS信息的获取

完成了嵌入式Linux下全球卫星定位系统的数据接收.在基于uClinux的嵌入式应用系统中,采用了MCF5272嵌入系统、M12和G18模块.以MCF5272微处理器为核心,通过GPS(Global Positing System)模块M12获取卫星定位数据信息,采用嵌入式Linux操作系统作为控制软件.通过G18接入无线移动数据网络,进而将数据通过Internet远程通信,由连接到Internet的远程服务器接收嵌入式系统获得的GPS数据.给出了嵌入式系统的组成,介绍了GPS卫星定位原理.用C语言在uClinux下实现了卫星定位数据接收软件,最后给出了接收实验数据.接收系统的分辨率:经度和纬度为1 marcs,高程为0.01 m,速度为0. 01 m/s.     

嵌入式Internet接入技术的研究与实现

在嵌入式系统应用领域,将嵌入式系统连接到Internet,实现嵌入式系统与Internet之间的资源共享、远程数据采集和状态控制等功能,这种嵌入式系统与Internet之间的连接与应用就称为嵌入式Internet。研究嵌入式系统与Internet的接入方法,具有重要的现实意义和经济价值,其发展前景十分广阔。     

基于USB的嵌入式远程视频监控系统设计

利用嵌入式系统开发技术与Internet技术,根据固定场所使用的特点,提出了一种采USB摄像头的嵌入式远程视频监控系统实现方案;本方案采用ARM 9S3C2410为处理器和嵌入式Linux作为系统服务器端,将USB摄像头采集的视频数据压缩后,通过Internet传输实现对固定场所的远程视频监控.     

基于嵌入式B/S监控平台电机监测系统的研究

随着嵌入式技术和网络技术的发展,远程监控系统已发展成为一个综合的、信息密集、操作人性化的智能化系统.目前,现场监控多采用现场总线技术对设备进行连接监控,随着网络技术的发展,监控设备实现网络化管理已经成为一种必然的趋势.嵌入式系统接入Internet成为当前嵌入式领域研究的热点之一,将嵌入式Web服务器移植到嵌入式系统后接入Internet,该嵌入式系统相当于一个功能齐全的小型Web服务器,可实现远程监控.     

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     

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