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.     

飞机状态监测无线传感器网络系统

ZigBee技术与无线传感器网络完美地结合在一起,成为无线传感器网络中无线通信应用的首选技术之一,具有低功耗、低成本、网络容量大、灵活安全和抗干扰能力强等特点.用ZigBee技术研制的飞机状态监测无线传感器网络系统布线少,可减少整个系统的重量和成本,增加系统的灵活性,还可快速的布局和监测数据,实时地传输动态信息,可以使飞机状态监测和故障诊断技术达到一个新水平,有力推动航空技术的发展.基于这一应用要求,将新型传感器和无线传感器网络技术相结合,设计了用于飞机状态监测的无线传感器网络系统方案及其相关节点,实验实现了系统的基本功能,初步验证了此飞机状态监测系统的可行性.     

基于ZigBee的温室环境监测系统的设计

针对现有温室环境监测系统存在的不足,设计了一种基于ZigBee无线传感器网络的监测系统,通过软硬件相结合实现了温室环境数据的实时监测。硬件部分以CC2530为核心构建ZigBee无线传感器网络,包括传感器节点、汇聚节点;软件部分包括传感器节点的数据采集和发送、汇聚节点数据接收和发送、上位机监测管理3个部分。采用LabVIEW对上位机监测软件系统进行开发,人机交互界面友好。测试结果表明,该系统工作性能稳定,结构简单,布点灵活,可以实现温室内环境数据的无线监测。     

基于ZigBee协议的智能农业管理系统

为了解决温室环境监测系统中遇到拓扑结构固定节点延展性差等问题,提出了基于ZigBee无线传感器网络的温室监测系统设计与实现方法,构建了基于ZigBee协议的无线监测网络,给出了网络中节点硬件和软件的设计方案,详细论述了ZigBee协调器的组网过程。测试结果表明,该系统具有结构简单、节点灵活功耗低等优点,实现了在无线环境下对温室中温湿度的有效监测。     

基于ZigBee无线传感器网络的煤矿监测系统设计

文章介绍了基于ZigBee无线传感器网络的煤矿监测系统的结构组成、适用于煤矿井巷环境的ZigBee无线传感器网络拓扑结构及网络节点的构成、软硬件设计等。凭借基于ZigBee技术的无线传感器网络节点可移动、组网快速简单、成本低、网络易维护等特点,该监测系统有着很大的推广应用价值。     

基于物联网的智能家居远程无线监控系统设计

基于ARM920T内核的S3C2440、嵌入式Web服务、QT技术、无线组网技术,设计了智能家居监控系统,系统由智能家居主机、ZigBee/Wi-Fi无线传感控制网络、智能家居客户端软件组成。系统完成了智能家居主机的硬件和软件设计：在ARM平台上移植嵌入式Linux操作系统;使用gSOAP工具建立嵌入式Web服务;配置USB转串口驱动、无线Wi-Fi网卡驱动;组建ZigBee无线传感控制网络,完成对协调器节点以及终端节点的程序设计,制定了数据通信协议;使用QT技术设计客户端程序。最后,重点测试ZigBee网络的建立、终端节点入网和传感器节点数据传输。测试结果表明网络中的传感器节点能够将检测的信息传送到协调器中,智能家居客户端软件能够通过智能家居主机完成对家居环境的远程监测和控制。     

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ZigBee的无线传感器网络设计与实现

无线传感器网络是由部署在监测区域内大量的廉价微型传感器结点组成,具有传感器节点密度高,网络拓扑变化频繁,以及节点的功率、计算能力和数据存储能力有限等特点。该文介绍了ZigBee网络与GSM/GPRS网络相结合实现远程监测的无线传感器网络的软件与硬件总体设计方法。     

应用于天然气管网安全监测的无线传感器网络节点设计与实现

利用无线传感器网络技术可对城市天然气管网安全进行在线、实时监测.结合具体应用需求和特点,设计了一种支持IEEE802.15.4和ZigBee协议的新型无线传感器网络节点.利用该节点,可以识别施工或其它外力对天然气管道的撞击破坏,检测管道附近泄漏的天然气浓度及异常温度等不安全因素.在集成微处理器和射频收发模块的"片上系统"芯片的基础上,实现了射频通信、数据采集和电源等模块的硬件电路设计,给出了节点间组网及数据传输的软件机制.实验结果表明,该节点具有功耗低、通信可靠等特点,可满足天然气管道安全监测的实际需要.     

基于PSoC的无线传感器网络系统设计

无线传感器网络能够实时监测、感知和采集网络分布区域内的各种环境或监测对象的信息,但是无线传感器网络节点能耗高、容易失效。针对这一问题,提出一种基于PSoC的无线传感器网络系统设计方案,采用CYPRESS公司PSoC芯片(可编程片上系统)CY8C29466作为节点处理器,实时采集网络各节点的电池电量,引入抗干扰能力较强的Wire-lessUSB通信技术构建无线网络,提高无线数据传输的可靠性,以车位锁管理系统设计为例,详细阐述了该传感器网络系统的硬件和软件设计。实际应用结果表明,该方案充分利用PSoC芯片内部的模拟资源和数字资源,缩小了体积,缩短开发周期,且能有效地降低系统的能耗,检测网络各节点当前的电量,通知管理人员及时更换电池。     

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。