基于嵌入式以太网的变电站自动化系统

随着微电子技术、计算机技术和通信技术的发展,变电站自动化技术正以飞快的速度向前发展。基于嵌入式以太网的变电站综合自动化技术正在成为当前研究的热点。简要叙述了常规变电站及其微机保护的发展及其特点,对嵌入式以太网运用于变电站微机保护系统以及目前流行的处理器进行了探讨和阐述,介绍了基于ARM+DSP双CPU的微机保护硬件方案和软件整体方案。     

基于变电站综合自动化保护系统的研究

变电站综合自动化即要实现对变电站的主要设备和输、配电线路的自动监视、测量、自动控制和微机保护,以及调度通信等综合自动化功能.随着计算机技术、网络通信技术和微电子技术的发展,变电站综合自动化在电力系统和厂矿企业已获得了广泛的应用,它替代了变电站常规二次设备,简化了变电站二次接线.实际的生产运行表明,变电站综合自动化保护系统是提高变电站安全稳定运行水平、降低运行维护成本、提高经济效益、向用户提供高质量电能的一项重要技术措施.     

变电站微机综合自动化系统基本不如能

变电站微机综合自动化系统基本不如能（１１４００２辽宁鞍山市电业局）郑定海ｌ概述变电站微机综合自动化系统是９０年代发展起来的具有生命力的多专业性综合技术，是电网运行管理中的一次变革。以计算机为基础，实现了电网变电站现代化管理，从而改变了传统变电站控制室...     

DCAP-3000在供配电系统自动化中的应用

本文基于DCAP-3000设计并实现了一套机场供配电自动化系统。首先研究了机场原供配电系统工作中存在的弊端,然后介绍了DCAP-3000系统分散式微机保护与控制单元的原理及技术特点,最后设计并实现了一种全新的变电站自动化系统。该系统已在成都双流国际机场成功实施。系统充分发挥了微机在无人值班变电站中的作用,提高了供电质量和管理水平,有效地实现了变电站综合自动化。     

兼容串行通信与以太网通信的微机保护通信系统研究

随着变电站自动化技术在电力系统中的逐步应用,势必要求变电站中各二次设备逐步实现网络化。微机继电保护装置作为变电站重要的二次设备,对其通信系统提出了很高的要求。本文根据微机保护通信系统的要求,设计了由以太网与串行通信相结合的通信系统,阐述了通信系统的硬件构成,完成了相关驱动程序与通信功能软件的编写。开发的通信系统对于提高电力系统综合自动化水平具有重要的现实意义。     

上海正大广场变电站计算机监控系统的研制

根据上海正大广场变电站计算机监控与保护一体化系统的研制情况 ,概述了整个系统的软硬件构成、网络结构、微机测量和保护装置、系统功能以及通讯协议的应用 ,提出了智能型大厦变电站综合自动化系统的开发新途径     

上海正大广场变电站计算机监控系统的研制

根据上海正大广场变电站计算机监控与保护一体化系统的研制情况,概述了整个系统的软硬件构成、网络结构、微机测量和保护装置、系统功能以及通讯协议的应用,提出了智能型大厦变电站综合自动化系统的开发新途径。     

Moxa V2402嵌入式计算机变电站SCADA后台机

变电站综合自动化是一项提高变电站安全、可靠稳定运行水平,降低运行维护成本,提高经济效益,向用户提供高质量电能服务的一项措施。随着自动化技术、通信技术、计算机和网络技术等高科技的飞速发展,一方面综合自动化系统取代或更新传统的变电站二次系统,已经成为必然趋势。另一方面,保护本身也需要自检查、故障录波、事件记录、运行监视和控制管理等更强健的功能。发展和完善变电站综合自动化系统,是电力系统发展的新的趋势。     

1lOkV变电站综合自动化系统设计研究

针对目前变电站综合自动化的新建及常规变电站改造工程，介绍、分析了变电站综合自动化系统的三种基本模式，并提出了一种1lOkV变电站综合自动化系统的设计方案。该方案首先从模式上进行总体选择，然后分别从数据通信子系统、监控子系统、保护子系统进行设计，并针对目前变电站综自系统存在的问题，提出了一些在设计过程中需要注意的问题。     

厂区电网线路微机综合保护的研究

分析了厂区电网线路微机综合保护的设置及保护性能,并对供电线路微机综合保护的计算机监控系统、通信技术、硬件和软件的设计进行了研究,阐明了电网线路微机保护运行的特点,以便对企业变电站及厂区电网线路的运行、管理提供有益的帮助.     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.