基于ZigBee技术的无线传感器网络及其应用研究

无线传感网络是当前国内外传感器技术领域的热点研究课题,着重研究了基于ZigBee技术的无线传感器网络节点的软硬件设计,实现了ZigBee无线传感器网络节点的设计,并运用该无线传感节点建立了基于ZigBee技术的无线结构健康监测系统,利用模式匹配的方法实现了基于无线传感器网络的载荷定位和结构紧固件失效的实时监测.     

LM3S9896与CL2520平台上的Zigaee组网技术及应用

ZigBee技术是基于IEEE802．15．4的一种新兴的短距离、低功耗、低成本和低速率的无线传感器网络技术。网络节点作为无线传感器网络的物理载体,如何实现众多网络节点的智能化接入成为关键问题之一。本文提出了LM3S9896＋CC2520平台上无线通信节点的智能化设计,分析了ZigBee无线组网与数据通信技术,并实现了...     

基于ZigBee的无线传感器网络节点的设计与实现

本文首先介绍了ZigBee相关概念,然后对基于ZigBee的无线传感器网络节点的开发平台进行介绍说明,最后就如何利用CC2430芯片进行基于ZigBee的无线传感器网络节点的设计与实现进行分析。     

一种优化ZigBee性能的综合加权选路算法

ZigBee的拓扑树路由算法设计的目标是应用于拓扑简单的、低负载的及低功耗的无线传感器网络环境,伴随着物联网技术及应用的广泛发展,物联网应用数据流可能会对ZigBee网络产生较大的负载,而现有ZigBee拓扑逻辑树构建方法无法兼顾链路配置和节点繁忙程度,需要优化ZigBee选路算法以提升网络整体性能.针对上述问题,本文在兼顾了节点繁忙程度、链路质量以及跳数等因素的基础上,提出一种基于链路综合加权的优化网络性能的选路算法.该算法在NS2平台上设计实现并通过了大量的模拟试验,结果表明该算法提高了分组到达率,减小了分组端到端时延,均衡了节点能量消耗,是一种适合于ZigBee网络环境的选路算法.     

基于ZigBee、GPRS和TCP/IP协议的无线网关设计

针对ZigBee无线传感器网络的远程监控技术的实现,设计一个将ZigBee协议与TCP/IP协议有机融合在一起的无线网关.系统运行时,互联网中的远程服务器可通过网关对ZigBee无线传感器网络所有节点进行监控.此网关设计方案成本低廉且易于实现,可以为无线传感器网络在诸多领域的应用开发提供设计参考.     

ZigBee线传感器网络在煤矿中的应用

根据煤矿地形特点和矿井分布情况，提出了一种基于ZigBee的无线传感器网络在煤矿安全系统的应用方案。该方案设计的ZigBee无线传感器网络由传感器节点、汇节点和网络协调器组成。负责煤矿各种安全指标信息的采集和传输。主要介绍了该方案中ZigBee无线传感器网络的网络结构、传感器节点的硬件结构和ZigBee模块的软件通信流程。ZigBee技术在该方案中的应用实现了煤矿安全系统的低功耗、低成本，并具有高度的灵活性和可扩展性。     

基于ARM和ZigBee的WSN节点设计与实现

设计一种基于ARM和ZigBee技术的WSN硬件节点,并根据该硬件平台的特性,有裁减地移植实现了Microchip ZigBee协议栈。对节点的性能进行组网测试,结果表明所设计的节点达到了无线传感器网络的设计要求,并具有良好的可扩展性和移植性,可以为工程应用和实验教学提供基础平台。     

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.     

无线传感器网络在钢结构监测中的应用

基于ZigBee的无线传感器网是由一组由ZigBee芯片、传感器、微处理器构建的节点所组成的无线网络.本文论述了基于ZigBee技术的无线传感器网络在码头装卸设备的钢结构动态监测系统中的应用,阐述了其应用的必要性和优势,分析了系统的性能,给出了监测系统具体的构建和实现方案,并通过实验验证了方案的可行性.     

基于MC13192的无线传感器网络节点设计

ZigBee技术是一种新兴的无线通信技术,以低速率、低功耗、短距离而著称,是目前研究的热门技术.本文简要介绍了ZigBee技术体系结构与特点,以及基于ZigBee技术的无线传感器网络的主要优势;重点介绍了一种采用符合ZigBee技术的射频芯片MC13192实现无线传感器网络节点的设计方案,并对系统硬件接口电路与无线通信软件流程作了说明.     

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。