嵌入式GIS概述及开发浅析

随着GIS的快速发展,人们对空间数据的需求也日益增大,把GIS与嵌入式技术融合在一起,形成一个嵌入式的地理空间集成平台,是当前GIS研究领域的一个重要趋势。本文从嵌入式GIS出发,论述了什么是嵌入式GIS,并介绍了嵌入式GIS开发方式和设计原则。     

GDIXEADP：面向服务的嵌入式软件开发平台

 针对当前多种多样的嵌入式开发环境,如多种处理器、外围设备等的存在,传统的嵌入式软件开发平台已经不能满足嵌入式开发多变的需求,不得不采用多个开发环境、多种开发工具以满足不同的需求,因此,如何构建一个统一的嵌入式软件开发平台架构,是一个迫切而实际的课题。SOA(Service Oriented Architecture)概念提供了一种可能,提出了一个基于SOA的服务软总线思想的嵌入式软件开发平台架构,可以将多种开发工具集成到一个统一的框架且具有很好的扩展性,并且将它应用于一个面向信息家电嵌入式应用的集成开发环境GDIXEAIDE实例。     

嵌入式系统开发工具及RTOS平台

嵌入式系统本身不具备开发能力,它的开发需要开发工具和环境,其开发工具称为实时在线仿真系统,其中在线仿真器的作用主要是取代应用系统的处理器和程序存储器,沟通开发系统与应用系统的联系,达到最接近真实的情况下,对软件和硬件进行联合调试的目的。嵌入式系统软件的高实时性是基本要求,因而用户必须自行选配RTOS开发平台,这样才能保证程序执行的实时性、可靠性,并减少开发时间,保障软件质量。C语言作为一种通用的高级语言,大幅度提高了嵌入式系统工程师的工作效率,使之能够充分发挥出嵌入式处理器日益提高的性能,缩短产品进入市场时间。     

基于eSupermap的校园移动GIS设计与实现

移动GIS是新一代地理信息系统发展的方向之一,是运行在嵌入式计算机系统上高度浓缩、高度精简的GIS软件系统.利用Window Mobile平台结合GIS二次开发控件eSupermap,结合校园实际情况开发的一个Client/Server模式系统.在系统中实现了地图显示与基本操作功能、查询属性功能,实现了嵌入式设备与蓝牙...     

GIS中的城市规划技术及实现研究

研究了基于组件的应用程序开发模型，给出了一个基于嵌入式组件技术的GIS软件开发的实施方案，设计了一个城市规划管理信息系统．     

基于组件式地理信息系统的二次开发--SuperMap Objects

组件式GIS是GIS与组件技术相结合的新一代地理信息系统。介绍了组件式GIS的基本概念、优点。以及大型组件式GIS开发平台SuperMap Objects 5的组成、功能划分和数据引擎。阐述了在C#．net中使用SuperMap Objects组件对象进行地理信息系统开发的基本步骤,并以Visual C#．NET 2003为开发工具,结合SuperMap Objects核心组件,给出了一个能把空间数据进行地图显示及实现放大、缩小、漫游等基本GIS功能的实例程序。     

嵌入式GIS在卫星导航系统中的应用

基于嵌入式GIS的卫星导航系统是嵌入式GIS的典型应用。本文介绍了嵌入式GIS的特点以及应用,并重点说明了目前广泛应用的基于嵌入式GIS的卫星导航系统的组成及其关键技术。     

嵌入式可视化开发环境的研究

使用可视化的开发工具可以大大提高嵌入式应用程序开发的效率、质量,从而降低开发成本,因此,对可视化开发工具的研究有很重要的实用价值。目前,针对PC应用程序的可视化开发技术已被广泛应用,而且已存在成熟的开发工具。分析和研究这些开发工具对嵌入式可视化开发环境的设计与实现有很大帮助。     

MapObjects在城市数字化建设中的应用

组件式地理信息系统是适应软件组件化潮流的新一代地理信息系统。Mapobjects是ESRI公司提供的的一组供GIS应用开发人员使用的制图与GIS功能ActiveX组件,是一个功能强大、使用方便的GIS快速开发工具。本文针对几个实际的数字化工作中的应用开发方向,研究使用Mapobjects进行GIS二次开发推进城市数字化建设的方法。     

基于uClinux嵌入式系统开发平台的建立

Linux由于其优势成为很多厂家开发嵌入式应用的操作系统,而ARM作为一种高性能、低成本的嵌入式RISC微处理器,已成为应用最为广泛的嵌入式处理器。介绍了ARM处理器和uClinux操作系统的特点,并结合S3C4510B开发板对整个开发过程,包括硬件结构、开发环境及开发工具进行了分析,特别是对交叉编译环境和uClinux的移植进行了重点分析。     

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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