CDMA技术在电力远程抄表系统中的应用

随着电网自动化程度的提高,远程抄表已成为提高电力部门供用电管理水平的重要手段。电力远程抄表系统中最重要的是通信技术的实现。本文通过对CDMA技术独特优点的分析,提出了基于CDMA技术的远程抄表方案。介绍了基于CDMA技术的电力远程抄表系统的组成、工作原理及功能。     

基于GPRS和低压电力线载波通信的智能远程抄表系统的设计

文章提出了一种基于GPRS和低压电力线载波通信的智能远程抄表系统的设计方案,给出了系统总体结构,阐述了GPRS通信和PLC通信的实现,详细介绍了远程终端集中器和采集器的设计,并给出了主站的抄表步骤。该智能远程抄表系统采用低压电力线作为集中器和采集器的传输信道,采用GPRS无线数据通信技术将集中器存储的电能数据上传到主站,实现了电量的远程自动抄收功能。实际应用表明,该智能远程抄表系统大大降低了抄表员的工作强度,提高了电力管理的自动化程度。     

智能住宅小区远程自动抄表系统设计

介绍了低压电力载波和电话网通信技术在智能住宅小区远程自动抄表中的应用，提出了一套远程抄表系统的设计方案，为实际使用提供了一整套灵活、廉价的远程自动抄表方法。系统具有较高的实用价值和应用前景。     

电力大用户远程自动化抄表系统的实现分析

随着科学技术的不断发展与革新,利用先进技术实现电力大用户远程自动化抄表是未来必然的发展趋势,也是促进电力企业持续、健康发展的重要途径。基于此,本文以《电力大用户远程自动化抄表系统的实现分析》为题,从电力大用户远程自动化抄表系统的总体设计,电力大用户远程自动化抄表系统的主要功能方面进行了详尽的分析与探讨。     

基于ZigBee技术的远程水抄表系统设计

应用ZigBee技术,可以实现无线远程水抄表系统的设计,该系统通过射频收发模块实现数据的传输.介绍了以TI公司的CC2430射频收发模块为核心的远程水抄表系统的硬件和软件流程的设计.将ZigBee技术应用于远程无线水抄表,实现了网络的双向传输.     

加密技术在远程抄表系统中的研究与应用

现行的远程抄表系统中,数据传输大多是以明文的形式进行,对于有经济价值的数据而言,无疑存在着隐患。由于人工抄表方式存在诸多弊病,远程自动抄表系统的应用日益普及,数据传输的安全性则变得尤为重要。主要就远程电力抄表通信协议的加密方法进行了讨论,采用DES算法对传输内容中的有效数据进行加密,从而提高系统数据传输的安全性。     

基于多跳网络远程抄表硬件系统关键算法设计

简要介绍了远程抄表采集端的硬件系统,在此基础上设计了基于多跳网络远程抄表硬件系统的关键组网算法和采集数据算法,能够高效完成远程抄表任务。     

基于多跳网络远程抄表硬件系统关键算法设计*

简要介绍了远程抄表采集端的硬件系统,在此基础上设计了基于多跳网络远程抄表硬件系统的关键组网算法和采集数据算法,能够高效完成远程抄表任务。     

一种多跳网络抄表系统关键算法设计

本文简要介绍了远程抄表采集端的硬件系统,在此基础上设计了基于多跳网络远程抄表系统的关键组网算法和采集数据算法,能过高效完成远程抄表任务。     

基于电力载波及LabVIEW技术的远程自动抄表系统研究

为满足电力行业改革与发展的需要,本文开发了一种以电力载波传输技术为核心的远程自动抄表系统。重点对远程抄表系统中的电能表通信部分进行了设计,并使用MI200E芯片实现了电力载波通信,同时利用LabVIEW软件的TCP网络通信技术将用户用电数据从小区物业管理中心传输到供电公司,为电网调度、负荷预测、电网安全稳定运行提供数据依据。     

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.