无线传感器网络硬件设计综述

无线传感器网络因其巨大的应用前景越来越受到学术界和工业界的广泛关注。本文介绍了无线传感器网络节点的体系结构,分析比较了国内外当前典型的硬件平台,重点讨论了目前无线传感器网络节点常用的处理器、射频芯片、电源和传感器各自的优缺点,并详细比较了目前应用于无线传感器网络的无线通信技术。     

多通信方式的WSN汇聚节点的设计与实现

针对无线传感器网络汇聚节点通信方式单一的问题,设计实现基于PXA270处理器的、具有以太网、CF无线局域网及GPRS网络等多种通信方式的无线传感器网络汇聚节点,完成汇聚节点硬件平台引导加载程序的移植,构建无线传感器网络实验与研究平台。实际应用证明,多通信方式的汇聚节点具有较高的实用性。     

无线传感器网络概述

无线传感器网络已经被广泛的应用到很多领域,如军事、医疗、环境监测、空间探索等,它综合计算机技术、传感器技术、信息处理技术和通信技术为一体,无线传感器网络的构成及应用场景与传统网络有较大的差异,无线传感器网络的应用前景非常广阔。     

无线传感器网络研究综述

无线传感器网络是计算机技术、传感器技术、通信技术结合的产物,在社会多个领域均有应用。文章对无线传感器网络的特点、关键技术及应用领域做了分析与总结,有助于在其他方面更深入的研究。     

基于WSN的二氧化碳传感器节点设计与实现

研究了ZigBee技术及JN5139CPU混合信号控制器,从无线传感器网络的基本单元出发,采用红外CO2传感器采集数据,设计了基于JN5139CPU模块的具有全功能设备(FFD)的灵活多变、性能优越的二氧化碳传感器节点。为无线传感器网络的深入研究提供了一个良好的硬件平台。系统具有较高的精度,实用性强,成本低,功耗小,应用前景良好。     

无线传感器网络安全威胁及对策

海军工程大学电子工程系湖北430000摘要：无线传感器网络作为一种新兴的技术,在军事监控,环境监测等领域有着重要的应用。但是由于无线传感器网络本身的限制,使得无线传感器网络安全很难得到保证,严重制约了无线传感器网络的应用。本文针对无线传感器网络的特点,分析了无线传感器网络的安全需求,介绍了无线传感器网络协议栈各层面临的主要安全威胁及相应的防御对策,研究了无线传感器网络安全机制。     

基于ZigBee协议的无线传感器网络节点设计

无线传感器网络无论是在国家安全,还是在国民经济诸多方面都有着广泛的应用前景。无线传感器网络技术综合了传感器技术、嵌入式计算机技术、现代网络及无线通信技术、分布式信息处理技术等,是一个多学科高度交叉的新兴前沿研究领域,在当今备受国内外关注。本文针对无线传感器网络技术在实际应用中的特点,利用Chipcon公司的CC2420射频收发器芯片,设计一个基于IEEE802.15.4/Zigbee协议的无线传感器网络节点,实现了传感数据的采集和传输。     

无线传感器网络相关技术研究

无线传感器网络是微机电技术、无线通信技术和数字信息处理等学科技术交叉发展的研究领域,具有十分广阔的应用前景,文章介绍了无线传感器网络的定义、组成及特点,并对关键技术进行了分析。     

无线传感器网络热点的研究

随着微机电系统、无线通信、嵌入式计算、微型传感器及集成电路等技术的飞速发展,无线传感器网络应运而生.由于无线传感器网络的广阔应用前景,它已经成为21世纪的一个新研究领域.从功能的角度分析了无线传感器网络当前研究热点,并对相关技术进行深入剖析,讨论了目前存在的问题和需要进一步研究的方向.     

无线传感器网络技术在海洋平台结构安全检测领域的应用研究

无线传感器网络能够很好地解决海洋平台结构检测中遇到的很多问题。对无线传感器网络这一无线通信中的热点领域在无线传感器网络体系构架、大规模组网技术及网络管理、环境感知技术、数据采集技术以及信息处理技术等方面进行了应用研究,以期能将该项技术应用于我国海洋平台结构的安全检测中。     

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。