基于ZigBee技术的温湿度监控系统

提出了一种新的基于ZigBee无线传感器网络的温湿度监控系统的实现方案,并阐述了系统的总体设计,包括节点的软件设计和硬件设计。系统采用CC2530射频芯片及SHT10数字温湿度传感器,在ZigBee Pro协议栈的基础上进行应用开发。实验测试表明,基于ZigBee无线传感网络的温湿度监控系统具有低成本、低功耗、网络容量大和采样点布置灵活的优点。     

基于ZigBee技术的多节点设备无线物联自组网设计

设计了一种基于ZigBee的多节点设备无线物联自组网络,采用ZigBee芯片CC2530构建终端采集节点、路由节点和协调器节点。终端采集节点周期性采集数据并通过多跳路由和协调器将数据上报到PC监控端。系统节点之间能够自组织构建网络,节点发生故障时,网络能够自我修复,使系统正常工作。     

用于ZigBee网络的同步休眠与唤醒算法

时间同步对于大多数的网络应用来说都是很重要的,特别在无线传感器网络中.由于无线节点的大小、成本,特别是能源都非常有限,所以节省能耗对于整个网络的正常运行尤为重要,而休眠是降低能耗的最主要的方法.基于对TPSN算法的研究,提出了一种适用于ZigBee网络的先分簇再同步的时间同步算法.实验结果表明,新同步算法能很好地应用于ZigBee网络,提高了同步的精确度和稳定性,能够满足ZigBee网络中节点同步休眠与唤醒的需要.     

基于ZigBee的仓库监控系统设计

为了对大型仓库的温湿度、光照、火警和安全情况进行监控,采用无线传感器网络,设计了一种基于ZigBee CC2530的多点数据采集、传输和处理的实时监控系统。该系统首先组成了ZigBee星形网络和ZigBee树形网络,然后在此局域网内,通过VB上位机监控软件和Web查询模式对仓库环境进行了控制和查询实验,实验表明,采用基于ZigBee技术的仓库管理是一个很好的尝试。     

基于WSN的育婴箱智能监控系统

为了实现育婴箱智能化管理问题,本文提出了一种基于WSN(Wireless Sensor Network)的育婴箱智能监控系统设计方案。该监控系统由传感器节点、汇聚节点、GPRS网络和远程监控中心组成。首先,通过温度传感器采集各个育婴箱的温度信息,然后利用ZigBee技术把温度信息传送到汇聚节点,最后利用GPRS网络把汇聚节点的信息传输到远程控制中心,从而实现对多个育婴箱的实时监控。     

矿用终端节点能耗研究

通过分析CC2530的低功耗模式以及基于ZigBee协议的Z-Stack协议栈的休眠与唤醒机制,设计了一种基于CC2530的矿用无线传感器网络终端节点。采用基于福禄克万用表测量的实测方法,测试该终端节点的能耗,得出结论:终端节点与协调器建立连接时消耗的电流最大,在休眠与唤醒模式下电流消耗较小;终端节点的平均工作电流受发射功率影响较小;终端节点的休眠周期直接影响电流消耗,周期越长,则能耗越低。     

ZigBee技术在工业监控网络中的应用

介绍了ZigBee技术及其特点,对ZigBee网络结构进行了分析,利用CC2430设计了一种基于ZigBee技术的工业监控网络系统。详细地介绍了系统各节点的硬件设计,基于MSSTATE_LRWPAN协议栈节点的应用程序设计,设计了PC机与协调器节点间的通信协议,最后给出了网络系统的测试结果。     

ZigBee的远程低功耗灌溉控制系统设计

设计一套基于ZigBee和GSM远程无线控制系统,对农田里的滴灌系统进行远程控制。设计了上位机和农田中的ZigBee协调器,ZigBee协调器与ZigBee终端传输消息来对灌溉系统进行安全有效的控制。采用适合于ZigBee星型网络的时间同步算法,满足ZigBee节点的同步休眠与唤醒的需要。设计相应的电磁阀控制策略对电磁阀进行安全有效的控制。     

基于CC2530无线传感网络的环境监测系统的设计

研究如何构建一个适合我国环境监测的ZigBee无线传感网络系统。针对ZigBee网络环境的特性,构建ZigBee服务器硬件与软件平台,基于ZigBee的无线网关,通过通用分组无线服务GPRS实现Internet对ZigBee网络各节点进行数据采集、控制、监控及状态显示等功能。     

ZigBee技术在工业监控网络中的应用

介绍了ZigBee技术及其特点,对ZigBee网络结构进行了分析,利用CC2430设计了一种基于ZigBee技术的工业监控网络系统.详细地介绍了系统各节点的硬件设计,基于MSSTATE_LRWPAN协议栈节点的应用程序设计,设计了PC机与协调器节点间的通信协议,最后给出了网络系统的测试结果.     

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.