基于GIS技术的矿井供电设计与计算系统

本文介绍了基于GIS技术的矿井供电设计与计算系统主要模块的设计和实现。系统利用UML建模,GIS空间数据结构,使用VC开发,ACCESS数据库。把CAD与矿井供电结合,增加了电网参数计算功能,使本系统较好的解决传统的手工绘制供电图纸与计算问题。     

VisualBasic的数据库访问技术漫谈

本文以VB为例,着力介绍了其在开发数据库应用程序时的数据访问接口问题,首先介绍了VB数据访问接口的底层技术,接着分析比较了几种 直接面向用户的访问接口,力图使读者在开发VB数据库应用程序时可以合理的选择数据访问接口。文中所介绍的同样适合于VC＋＋     

MATLAB与VB的集成在电力系统潮流计算中的应用

潮流计算是电力系统中最重要的一种电气计算,在离线和在线计算中都发挥着重要的作用.在利用以复数矩阵为基本单元的MATLAB开发潮流算法程序、用VB开发潮流计算程序界面的基础上,本文探讨了MATLAB与VB无缝集成的技术,并通过ActiveX技术实现了MATLAB与VB的链接,完成数据通信.     

船用交流供电系统电容漏电流自动测量补偿方法

舰船交流供电系统中。多采用中性点不接地运行方式，由于系统对地电容泄漏电流的存在．对电力系统供电安全带来隐患。本文针对舰船供电系统，提出了采用单片机控制系统，对电网对地电容漏电流进行实时跟踪测量。利用磁阀式消弧线圈对其进行自动补偿的方法。     

电气化铁道牵引供电系统电压损失补偿方法研究

为解决现有电压损失补偿方法存在的补偿效果、效率不佳的问题，提出电气化铁道牵引供电系统电压损失补偿优化方法。根据牵引供电系统的供电方式和硬件设备的空间关系，构建电气化铁道牵引供电系统数学模型。在该模型下，模拟供电系统负荷过程。通过计算供电系统电压损失量，确定电压的待补偿值，利用安装的静态无功补偿器，实现供电系统的电压损失补偿。经过补偿效果测试实验得出结论：在三种不同的牵引工况下，应用设计的损失补偿方法能够将供电系统输出电压的畸变率控制在1%以下，且补偿时间开销低于30 s,即设计电压损失补偿方法在效果和效率两个方面均具有明显优势。     

基于供电可靠性要求下的供电半径计算结果研究

随着现代科学技术的迅速发展,电力系统的供电可靠性已经基本得到了保障,在此基础上供电技术人员渴望寻求一种优化算法,计算出最佳供电半径,实现供电经济成本最小化目标,以此完善整个电网供电系统。     

组件式GIS应用研究

组件式GIS是适应软件组件化潮流的新一代地理信息系统，是未来GIS发展的重要趋势。介绍了组件式GIS软件开发原理及其相关技术，并以VC＋＋6．0开发环境和MapX为例，探讨了在VC＋＋环境中如何实现地理信息系统组件的嵌入、地理信息系统基本功能如图形的放大、漫游以及图形显示等基本问题，从而为开发基于VC＋＋环境的组件式地理信息系统提供了参考和依据。     

基于VB的超临界萃取釜参数化系统开发

针对快开式超临界萃取釜结构开发了参数化有限元分析系统.通过ANSYS参数化编程语言APDL来完成快开式萃取釜各结构建模、应力分析以及编译密封结构中应力集中点疲劳分析计算程序:利用VB的"可视化"界面的特点,制作参数化输入界面,通过VB程序编制,达到成功进行变量参数设置、调用ANSYS软件进行计算的目的.     

虚拟仪器技术在CL6—1测量仪数字化中的应用

本文简单叙述了如何利用VC＋＋、VB平台开发虚拟仪器的软件总体设计思想、动态连接库的特点及其应用技术;基于PC机硬件平台开发ISA数据采集卡的硬件设计技术、总体结构以及和数采软件的的接口技术。     

基于DSP的低压动态无功补偿控制器的设计

针对传统的无功补偿控制器反应不够迅速及数据采集功能的不足,设计了一种基于TI公司TMS320LF2407A的动态无功补偿控制器.控制器采用三个单片机模块化设计以提高性能,采用Q格式计算提高运算速度,采用先进的电容器投切方式提高电容器的使用寿命.控制器具有的多种数据采集方式可分别利用GPRS或CDMA网络构成远程无线通信网络或直接采用手抄器或U盘完成对控制器数据的收集.该控制器已在工厂投入使用,运行结果表明该动态无功补偿控制器能快速补偿电网无功,使功率因数保持在较高水平,较好地改善了供电质量,提高了供电系统的经济效益,达到了设计要求.     

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。