基于掌上电脑的地下管线普查与测量系统

研究目的是为建立数字化地下管线信息库提供野外测量数字成图一体化工作模式的软件平台,满足数字城市建设的需要。主要方法是以掌上电脑(PDA)为硬件平台,以eMbeddedVisualC++为软件开发工具开发管线普查与测量数据采集系统的用户规范、数据模型及功能模块,给出了系统实现过程中一些关键问题的解决方案。系统已通过验收并应用于生产,结果表明该系统大幅度提高了作业速度和精度,在生产实践中证明了其快捷性与实用性。从而得出基于WindowsCE嵌入式操作系统PDA开发管线普查与测量系统软件,实现测量成图一体化的前端数据采集具有现实性和可行性这一重要结论。     

基于地磁成像的管线探测系统

为了精确探测埋藏在地下的各种管线,提出了基于地磁成像的管线探测系统。该系统将采集到的地表磁场垂直分量的脉冲信号强度与介质各向同性的均匀地层中地表上方磁场垂直分量的脉冲信号强度进行对比,利用对比后的数据形成反映被测区域上方脉冲信号强弱分布的三维图象,从而对地下介质的性质作出判断。测试结果表明,该系统对地下已知管线探测的MAPE为2.66%,对地下未知管线探测的MAPE为3.33%,提高了同类探测的精度,对地下各种管线的探测行之有效。     

城市综合地下管线信息系统实现及几个关键问题的探讨

随着城市现代化程度的不断提高,城市地下管线已成为城市生存和发展的血脉.基于GIS技术建立相应的地下管线信息系统来管理地下管线信息是提高城市管理、建设效率的重要手段.本文论述了基于ArcGIS Engine组件进行的地下管线信息系统开发,并针对地下管线系统建设中的诸如管线符号化、管线时空数据管理、多版本并发冲突等几个关键、难点问题进行探讨,提出了解决方案,也为相关地下管线信息系统的建设提供了借鉴方案和技术方法.     

基于PDA的内外业一体化技术在地下管线普查中的应用

本文介绍了一种在地下管线普查中基于掌上电脑的外业数据采集和内业直接成图一体化的工作模式,对系统总体设计、系统功能实现和地下管线普查内外业一体化作业流程进行了详细的描述,为地下管线数据采集及图形绘制提供了一种快速、准确的方法。结果表明该作业模式利用程序自动处理,大幅度提高了作业速度和精度,极大降低了内业数据处理的工作量,在生产实践中证明了其快捷性与实用性。     

城市综合地下管线信息系统开发模式与关键技术

城市地下管线的隐蔽性、动态性、网络性和多样性决定了地下管线信息管理与信息系统开发的复杂性与难度。本文给出了一种城市综合信息系统开发模式，很好地解决了数据的可靠性和精度、数据的动态更新等难题，并对信息系统设计进行了较详细的描述。该模式对大中城市综合地下管线系统的建设具有很好的借鉴和指导意义。     

各向异性磁阻传感器在地磁探测中的应用

为验证各向异性磁阻传感器在地磁探测过程中的灵敏度和精确性,基于各向异性磁阻传感器的工作原理,利用霍尼韦尔Hmc1001型磁阻传感器分别对地表裸露金属物、地下埋藏金属物以及地下未知管线进行了探测实验.实验表明,各向异性磁阻传感器提高了同类探测的精度,对地下可疑物进行相关探测行之有效.     

基于GPU的地下管线三维可视化建模研究

地下管线的三维建模与可视化是构建“数字城市”的重要内容,总结现有地下管线实时建模算法的不足,提出一种利用GPU编程实现的地下管线实时三维可视化建模算法。利用现代GPU的可编程特性将管线建模的计算任务全部移植到GPU端完成,CPU端只需传入管径和管线节点坐标,利用GPU提供的几何着色器完成管线模型的顶点坐标计算、管线顶点数据自动生成及管线三角网构建等工作,并通过光照和纹理映射实现管线材质的真实感效果。实验结果表明,该算法克服了现有建模算法的缺陷,能够在保证管线拟合逼真度的基础上完成大规模管网系统三维实时可视化建模的任务。     

城市生命线“呼救”

地下管网、地铁、隧道、地下商场、地下车库等众多的地下设施构成了城市之“根”,分担着城市发展的压力。这为市政管理带来了新的挑战。据统计数字显示,全国每年因施工发生的地下管线事故造成的直接经济损失约50亿元,间接经济损失约 400亿元。利用信息化手段来提高对城市地下空间的管理能力, 将成为市政管理的重要工具。     

城市地下管线信息管理系统建设

当前,国内很多城市地下管线管理较为混乱,导致地下管线事故频发,道路重复开挖现象严重.地下管线信息化的管理,可以为地下管线施工提供指导,为城市规划、管理、建设提供技术支持,减少这些地下管线事故的发生,提高城市基础设施建设和管理的效率.文章通过分析当下国内城市地下管线信息的情况,探讨城市地下管线信息管理系统以和相应配套制度的建设,以及系统建设中存在的问题和解决这些问题的方法.     

基于Android的移动GIS管线应用设计与实现

地下管线数据是城市公共基础设施的重要组成部分,如何将地下管线数据信息带到施工现场,以及对管线的巡检问题快速上报,管理者对移动GIS管线应用的需求日益提升。本文基于Android平台设计并开发了移动GIS管线应用系统,集嵌入式GIS、GPS定位、GPRS数据传输以及数据库管理等技术于一体,实现了管线的业务查询、巡检问题的快速上报,提高了地下管线的科学管理水平。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。