基于网络传输信息的远动系统

随着数据通信及网络技术的发展,通过网络传输远动信息已成为电力自动化系统的发展方向.为了保证电力系统调度自动化的功能和远动信息的实时性、可靠性,分析了远动信息的传输方式,提出了基于CAN网络的远动系统的开发研究.给出了系统组成结构以及软件设计的方法,介绍了基于TCP/IP协议的厂站端远动装置RTU与远方监控系统通信的实现方法.     

DNP3.0在基于DSP的FTU中的实现

馈线终端单元(FTU)是配电自动化系统中的重要组成部分,以DSP为核心构成的FTU具有运算速度快和精度高等特点,而DNP3.0则是FTU与配网主站通信的主流规约。讨论了在DSP平台上实现DNP3.0的特殊性,介绍了DSP片内异步串口的使用方法,给出了程序的主要流程图和数据结构以及涉及串行通信的C语言源码。     

CAN总线应用层通信协议的设计与实现

针对传感器识别系统中的CAN总线通信问题,给出了一种CAN总线应用层通信协议--DNP的设计方案.在简单介绍该CAN总线网络的基础上,详细阐述了DNP协议模型、报文格式和消息编码.以DNP协议的主站工作流程为例介绍了DNP协议的实现方法,并给出了实际效果.DNP协议的设计思想对中小型CAN总线通信的应用具有一定的参考价值.     

浅谈继电保护综合自动化系统

为了保证电力系统的安全稳定运行,必须提高继电保护的正确动作率,更好地满足电力系统安全运行的要求。继电保护综合自动化系统的实现,加强了继电保护的效能和可靠性,对保证电网安全稳定运行起到了重大的意义。本文提出了继电保护综合自动化系统的概念,并阐述了该系统的结构,功能及实现方法。     

新品

红狮控制 Graphite HMI平台新增DNP3协议支持功能 2017年1月11日,美国红狮控制公司宣布其坚固耐用型Graphite~平台新增DNP3网络协议支持功能,通信功能进一步得到提升。配合Graphite人机界面(HMI)操作面板和核心控制器,此通信协议可无缝监测和控制需要DNP3网络协议支持的过程自动化设备。     

一种基于DNP3协议的IFAR攻击检测算法

分布式网络协议(DNP3)是现代监控和数据采集网络协议之一,是主设备和从设备之间进行通信的双向协议。为了提高可靠性,DNP3在其应用层中包含了传输功能。因为DNP3并未考虑安全机制,所以它很容易遭受到攻击。基于DNP3的通信系统,文章搭建了Pfsense防火墙,并结合Snort进行攻击检测,采用孤立森林与关联规则算法(IFAR),将数据分为异常与非异常,并将异常数据处理为强规则,扩充入侵检测系统。测试结果表明,该算法能有效检测异常攻击,检测率可达到93.35%。     

配电自动化系统中应用DNP3.0协议进行数据通信

DNP协议具有高度的灵活性和不需任何特殊构造目标硬件的开放性,适用于高安全性、中等传输速度和中等吞吐量的应用本文详细介绍了DNP协议,分析了其在配电综合自动化系统中的应用途径和设计方法,并给出了部分实现例程     

基于RTPS和CAN总线的变电站通信系统

变电站自动化系统是一个分层分布式的结构，系统中设备必须能信息交互，并且能与站级监控中心通信，这就涉及到了通信网络的建立，还必须考虑系统的通信的可靠性与实时性的问题。本文提出了一种利用RTPS协议和CAN总线构建变电站自动化的通信系统，充分利用RTPS和CAN的特性，实现变电站综合自动化系统的实时性和可靠性。     

引黄工程计算机监控系统中的数据通信规约

介绍了引黄工程WAN结构和配置,提出了引黄工程计算机监控系统中数据通信的分层分布式结构模式,其通信协议采用TCP/IP协议,传输层的数据格式为DNP3.0,现地层采用现场总线和RS LINK通信协议。这些协议的开放性以及现地协议的实时性,既满足了引黄工程后期建设对计算机监控系统开放和可扩充的要求,又实现了全线自动调度调节以及现地实时控制的功能。     

基于SIP的图书馆服务机器人无线通信系统设计*

图书馆服务机器人自动控制系统开发是实现图书馆文献管理自动化的重要举措,而服务机器人和管理服务器的通信是整个系统能够正常运转的关键。介绍SIP协议和Osip2、eXosip协议栈,并采用Osip2、eXosip实现SIP协议流程,结合MIME、MSRP等开源协议栈,设计一种基于SIP协议的图书馆服务机器人无线通信系统。该系统实用性和可靠性强,运用于图书馆服务机器人自动控制系统中,可有效降低系统成本,提高系统运行效率。     

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。