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.     

基于ZigBee技术的无线电能抄表网络节点的设计

ZigBee无线网络技术具有低功耗、低成本和短延时等优势,是目前世界上发展最快,市场前景最广阔的新技术之一。本文针对ZigBee技术特点,在ZigBee协议基础之上,采用TI公司ZigBee解决方案的高集成度、高性能SOC片上系统芯片CC2430作为控制器和无线收发器,电能表的设计采用电能计量芯片ATT7022B,设计了一种基于ZigBee技术的无线电能抄表网络节点的硬件系统方案,并对网络节点与协调器之间的无线收发进行了实际验证,协调器可以对节点进行无线抄表。结果表明:电能计量和ZigBee的点对点无线传输的正确性和可靠性。     

基于ZigBee的远程无线抄表系统研究与设计

为了解决传统抄表收费方式实时性差、准确性低、收费难等问题,提出了一种基于ZigBee技术和GPRS技术的低功耗、低成本无线抄表系统。采集器、集中器由低功耗片上的CC2430构成,数据通讯由ZigBee传感器网络进行,并与远程无线网络GPRS相结合,可实现对数据的定时采集。该系统实现了对电能表高效精准、操作便捷的远程数据采集,提高了远程无线抄表的效率。     

基于ZigBee的无线水表抄表系统的设计

为方便、准确、及时地对用户水表用水量进行抄读,实现水表抄表的自动化、网络化和规范化,建立了基于ZigBee无线网络的自动抄表系统,提出了无线抄表的方案,并完成了对节点电路及各相应模块电路的设计。通过测试,节点模块能准确地对脉冲水表进行抄读,并且各节点之间可以顺利、准确地实现数据的传输,证实了将ZigBee技术应用于无线抄表的可能性。     

自组织ZigBee技术在电量采集中的应用

考虑到传统电能表抄表时存在的众多弊端,提出了使用ZigBee作为传输方式的电能表无线抄表方式.该方案通过RS485方式把采集点的电能表数据采集起来,再使用ZigBee把数据传送到监控中心,由监控中心的软件对数据进行汇总处理.方案中利用CC2430构架ZigBee节点,构成低功耗、低成本的硬件平台,并采用星状拓扑结构、精简版协议栈结合多路按需路由算法,实现了电量数据的无线传输.结果表明:此系统无需布线,能够快速组网自动配置和自动恢复,传输可靠,符合实际应用的要求.     

一种基于ZigBee的无线抄表系统研究与设计

提出了一种基于短距离无线通信技术ZigBee的三层分布式无线抄表系统,系统由低功耗片上系统CC2530构成采集器、路由器、集中器,采用ZigBee传感器网络进行数据通信,与远距离无线网络GPRS相结合,系统兼具分布式与集中式的特征,可实现在主动抄表方式下各数据采集单元的定时采集,以及被动抄表方式下单播、组播和广播等多种集抄方式,且具有低功耗、低成本、高可靠性数据传输的特点.     

Z-Stack剖析及其在无线测温网络中的应用

针对无线传感器网络在应用中的能耗问题,提出将ZigBee技术应用于无线传感器网络,采用超低功耗单片机和无线模块构成节点的方案,在剖析德州公司发布的免费协议栈Z-Stack基础上,架构了应用于无线温度监测的超低功耗ZigBee网络,可满足无线监测系统需长时间工作的要求,具有很好的应用前景。     

在CC2430上使终端设备依据特定的PAN ID入网

引言ZigBee是一种崭新的,专注于低功耗、低成本、低复杂度、低速率的近程无线网络通信技术,也是目前嵌入式应用的一个大热点。近年来,ZigBee无线数据网络在我国应用越来越多。在很多地方取代了局域网。实际应用于楼宇监控系统、无线方式集中抄表以及矿山救援系统和家电控制等等。文中谈及在我国有较多客户使用的TI公司的产品CC2430。     

基于ZigBee技术的远程无线抄表系统设计

针对传统抄表技术中存在的一些问题,设计了基于ZigBee技术的远程无线抄表系统.将CC2430芯片与微控制系统相结合,实现无线远程三表控制和对流量数据的读取,结合ZigBee特点和系统各部分的功能,建立了系统的网络结构.     

基于ZigBee的社区无线抄表系统设计

论文针对无线传感器网络技术在抄表系统中的应用,研究并设计了基于ZigBee的社区无线抄表系统.系统采用ZigBee构建无线传感器网络进行社区内电表数据信息的采集和传递,然后通过GPRS公网将数据传送至电表集抄中心,实现了远程查看和管控.主要介绍了无线抄表系统的结构、ZigBee网络中各类节点的硬件结构和软件流程.无线抄表系统具有布网简单易行、节约能耗、稳定性较高以及易于远程维护等优点.     

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     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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。