基于Acrel-1000的35 kV智能变电站综合自动化系统设计

基于智能变电站综合自动化系统的概念,对35 kV变电站进行设计,采用Acrel-1000变电站综合自动化系统,实现变电站继电保护、测量监视、遥控、遥信、遥测、事件处理、记录打印等功能。该系统结构精简、工作可靠,功能准确,操作控制无误,便于调试与维护,不仅能够独立运行,还能联网形成智能自动化系统独立运行,可满足监控中心无人值班需求,有利于提高变电站的自动化水平,降低故障处理成本和人工维护成本。     

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.     

基于CAN总线的变电站监控系统的设计与实现

基于CAN自定义协议Qucan_A,采用组态王开发了监控界面,实现了变电站与现场系统之间的数据通信,利用VB开发了主机驱动程序,提供了组态王与主机驱动程序的OPC接口,实现了变电站的保护、测量、采集、通讯、控制及运行管理、顺序事件记录,超限报警等。实践证明该系统运行状况良好,能保证变电站安全可靠运行。     

矿用胶带机集中控制系统的研制

介绍了由多台智能综保仪构成的矿用胶带机集中控制系统,每台综保仪能实现各胶带机胶带的高低速度、滚筒温度、机头烟雾、CO浓度、堆煤以及跑偏等各种保护功能,还兼有与前后胶带机智能综保仪通信的功能,使整个系统具有逆煤流启动、顺煤流延时停车功能。     

基于DSP和CPLD的行波管放大器控保系统的设计

随着大功率发射机技术的发展,要求发射机的控制与保护电路更加完善、可靠。为解决这一问题,采用DSP和CPLD技术设计研制了一套行波管放大器的控制保护系统。该系统能够控制放大器分别运行于三种不同的工作模式（连续波输出、脉冲波输出和分时输出）,每种模式下的调制脉冲以及调节输出功率大小的时序波形均由CPLD产生。同时该控保系统能够对放大器的工作状态进行实时监测与显示,当功放工作异常时,系统能快速进行保护,显示故障信息并触发蜂鸣器报警。现场试验表明,该系统可靠稳定,能有效地实现对行波管放大器的控制与保护。     

基于云服务的有序分散负荷T接分支箱设计

针对新能源充电设施的智能化发展趋势，通过分析新能源汽车智能充电桩与电网稳定运行之间的关系，提出对充电桩进行分时控制和负荷控制的具备保护功能的智能控制系统。该系统通过在充电桩与上级电源之间增加智能微型断路器模块和智能网关模块，通过智能网关自动对智能微断进行控制，从而达到对充电桩分时控制和负荷控制的功能。同时，通过云服务系统，实时采集系统数据和对用电数据进行分析，制定充电桩用电有序分散策略，远程控制设备动作，从而保证充电桩在使用过程中电网不过载运行，实现对上级电源的实时保护，确保电网可靠稳定运行。     

基于C8051F单片机的电力系统智能测控装置的设计

提出了基于C8051F单片机的电力系统智能测控装置的设计。该智能装置集电力系统的测量、控制、保护、通讯功能于一体,集成度高,功能强大,经济可靠;既可作为变电站综合自动化系统的过程层单元,又可独立使用,具有很好的实用价值。     

基于变电站智能辅助控制系统应用研究

变电站智能辅助控制系统采用嵌入式硬件系统及组态化应用软件,对变电站内辅助生产系统进行系统整合、信息收集、分析及控制,结合组态化软件,实现了变电站智能辅助控制系统各个信息相互传递及控制,遵循"集中管理、分散控制、数据共享"原则,进行实时监控和控制。变电站智能辅助控制系统保障了变电站稳定、可靠,以全天候、全自动化,便于使用等特点电力系统领域发挥了独特的作用。     

电力电子设备对配电系统继电保护的影响

为了确保智能配电系统的稳定运行,提高电力电子设备以及配电系统的运行稳定性,研究电力电子设备对配电系统继电保护的影响。结合配电系统的实际情况,分析配电系统中继电保护的基本机制,并从电力电子设备的安装位置、谐波导致电压电流发生畸形两方面对配电系统继电保护的影响进行研究。针对电力电子设备对配电系统造成的危害以及可能导致的后果,阐述了如何科学有效地对配电系统进行继电保护,并进行了后期维护配电系统继电保护方法的讨论。提出了掌握配电系统的相关运作以及提高电力系统的稳定性的策略,以全面提高电力电子设备运行的稳定性。实验结果表明,电力电子设备运行稳定性与配电系统继电保护稳定性呈正相关关系。     

智能电力监控系统在医院配电系统中的运用初探

医院建立电力监控系统平台可以对其配电系统进行综合调度与集中管理。本文通过概述智能电力监控系统的特点,探究此系统在医院配电系统中数据归档、报表、统计、分析等方面的功能,提升配电系统的管理能力,节省系统运行成本,通过构建先进、安全、可靠、高效的配电系统实现医院电力的自动化管理。     

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.