基于S3C2410X的Linux移植研究

为了充分利用S3C2410X丰富的外围资源,实现多任务同时进行,需要嵌入一个小的操作系统.介绍了移植Linux操作系统到S3C2410X的过程,包括建立交叉编译环境、裁减和编译启动代码(Boot Loader)、Linux内核、制作文件系统.     

基于ARM的交叉编译工具的制作

交叉编译就是在一个平台生成可以在另一个平台执行的代码,它作为嵌入式系统开发的前提和准备,具有相当重要的作用.文章利用Cosstool脚本工具集,详细说明了基于ARM和Linux的嵌入式系统的交叉编译环境的建立方法,并给出了具体的步骤.实验结果表明,可以在x86平台编译调试ARM平台上运行的程序.     

嵌入式系统及其典型开发模式

嵌入式系统被誉为"后PC"时代的新秀,其特点和开发技术备受人们关注.剖析了嵌入式系统的低功耗嵌入式微处理器,紧缩型操作系统,丰富的外部接口和外形等特点及模块化的内部结构,提出了基于宿主机-目标机模式的嵌入式系统的典型开发模式,这种开发模式具有整体开发思路清晰,便于系统分工,容易实现同步开发等优点.并详细分析了交叉编译和远程调试是宿主机-目标机模式的典型开发特征,对嵌入式系统的发展作了展望,提出网络化、SOC、低成本等是其发展的必然趋势.     

基于GNU工具链开发的微型Linux系统

针对传统Linux发行版自带繁杂的驱动、 极耗资源的图形桌面和多余软件包的问题, 构建可用于特定处理器且优化裁剪的系统。利用GNU(GNUs Not UNIX)工具
链、 Linux 2.6.25内核及相关部件, 提出一种制作在USB存储器上的微型操作系统。同时讨论了交叉编译环境的建立, 工具链的使用以及制作过程中root权限归属、 内核USB相关模块选择、 grub启动出错等问题的解决办法。该方案以opensuse 11.4为宿主机系统, 基于开放的源码, 在x86 PC机与U盘组成的硬件平台上, 完成微型Linux系统开发。结果表明, 在低成本教学实验台上, 该系统仅占用600 MByte左右的存储空间, 能保证完成教学编程实验要求, 确保较快的启动和运行速率。     

基于蓝牙技术的嵌入式广告发送系统设计

介绍了基于蓝牙技术的嵌入式广告发送系统的设计与实现。系统以嵌入式CPU S3C2440为硬件核心,以嵌入式Linux为操作系统,搭配USB蓝牙适配器(Dongle),构建一个嵌入式蓝牙广告发送系统。交叉编译BlueZ的库和工具,构建ARM Linux下的蓝牙运行环境。通过对蓝牙适配器的编程,实现了将各种媒体文件通过蓝牙适配器传送给蓝牙手机的功能。     

实时控制系统平台xPC与LabVIEW接口分析及应用

对实时控制系统平台xPC目标宿主机监控程序的设计问题进行了研究,建立了xPC目标与虚拟仪器软件设计工具的接口.依功能分类总结了xPC目标应用编程接口(API)函数在建立宿主机/目标机连接并对目标机进行监控最后退出系统过程中的应用.分析xPC目标与其他语言接口的条件,提取xPC目标运行所需的数据结构定义,数据类型映射,常量定义,动态链接库函数加载程序,并建立xPC目标平台与LabVIEW编程接口的动态链接库.探讨了在其他语言中使用xPC目标接口函数建立宿主机监控程序的过程.利用创建的动态链接库结合xPC目标接口函数在LabVIEw中实现了xPC目标宿主机监控程序的设计.     

浅谈嵌入式Linux开发中NFS的安装配置

NFS（Network File System）是一种分布式文件系统,允许网络中安装不同操作系统的计算机间共享文件和外设,它的通讯协定设计与主机及操作系统无关。这样的特性正好迎合了嵌入式产品的开发环境,即宿主机与目标机的模式;并且免去了经交叉编译后由FTP方式下载到目标板的低效工作方式,最终实现了嵌入式开发的在线调试。     

基于BP和ARM的发动机声音识别系统

为解决高速公路收费站及大型停车收费场自动收费问题,依据BP神经网络识别理论,设计了一个基于ARM9及嵌入式Linux系统的发动机声音识别系统。选用S3C2410微处理器和嵌入式Linux操作系统,把交叉编译后的发动机声音识别C语言程序移植到操作系统的文件中,实现了发动机声音实时识别功能,给出了系统整体软硬件结构框架以及实时输入发动机声音判别汽车类型的识别结果。现场实验证实了该系统的准确性、实时性和有效性。     

基于ARM的嵌入式Linux无线网卡设备驱动设计

本文介绍了D-Link无线网卡在嵌入式Linux下的驱动设计与实现,该设计可以用于构建无线数据采集系统。首先搭建好嵌入式开发的软硬件环境,分析Linux内核USB驱动模块和网络驱动工作原理,然后针对D-Link无线网卡对通用的无线网卡驱动进行修改和交叉编译,最终移植到ARM平台上,建立嵌入式无线局域网,为进一步的无线网络研究搭建好开发平台。ARM微处理器的使用使本系统比传统的数据采集系统更具有便携性和灵活性,甚至可以工作在恶劣的环境之中。     

嵌入式软PLC开发系统研究

基于ARM处理器和Linux操作系统的嵌入式软PLC运行系统,针对开发系统生成的目标代码通用性和不便于用户使用问题,设计了一种将IEC61131—3标准的语言程序转换为C语言程序的开发系统,使系统生成的目标代码在此种类型的运行系统上具有通用性。生成的LinuxC程序不仅能够在运行系统上直接编译运行,而且便于在PC机上仿真测试。介绍了各个模块的功能和实现,重点阐述了编译模块的设计与实现的关键技术,并结合实例进行测试验证。实验表明,该系统界面友好、操作简单,编译出的C语言程序执行效率较高,通用性强,方便用户使用。     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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