农田环境监测系统设计与实现

针对农业生产的自动化管理需求,介绍了ARM与Zig Bee技术相结合设计农田环境监测系统的方法。硬件部分采用Zig Bee外接传感器设计环境数据采集节点,采用S3C2440处理器和CC2530设计协调器网关,其中CC2530与ARM之间采用SPI口进行数据通信。软件部分基于IAR平台结合Z-Stack协议栈构建Zig Bee无线监测网络,用于采集并传输影响农作物生长的现场环境信息,数据在基于ARM与Zig Bee技术相结合而开发的网关节点处实现汇聚,最终通过串口发送到基于VC++6.0与数据库技术开发的上位机监测系统。经测试,网关节点能实时接收传感器节点的数据,并通过串口成功上传到上位机监测系统,实现实时数据监测、动态分析、历史查询和异常报警功能,系统具有较好的稳定性和实用性。     

风力发电机组无线监测系统设计

针对目前风力发电机组有线监测系统安装、维护不便和监测点有限等问题,设计了一种基于Zig Bee的无线传感器网络监控系统。通过网关将Zig Bee协议转换成TCP/IP协议后,Zig Bee子网采集的数据,经光纤网络传送至中心服务器,并通过登陆界面来显示和控制无线监测系统,实现风力发电机组的智能化监测。测试表明:测量精度达到设计要求,实现高效率、高可靠性的监测,并通过Internet提供远程数据服务,进行离线数据分析和挖掘。     

应用于电力设备的智能无线温度预警系统

电力设备在长期运行中,由于连接部位温度过高等原因造成事故发生,文章完成的智能无限温度预警系统对电力设备温度的预警降低了事故损失,工作包括了节点的软、硬件设计、实现与测试。预警系统将信息采集模块、Zig Bee无线通信模块及其外围电路、上位机监测软件等通过Zig Bee技术组网,将终端节点采集到的信息通过Zig Bee射频模块进行无线发送,同时,协调器通过USB与监控主机相连,利用蜂鸣器实现报警。     

基于ZigBee的土壤墒情监测系统

介绍了基于Zig Bee的土壤墒情监测系统的原理和设计.采用了大功率Zig Bee无线数传模块,有效地减少了节点的个数,提高了通信的可靠性.用太阳能电池供电,使得节点的长期稳定工作有了保障.可用于实时监测土壤的湿度、温度参数,为自动喷灌或滴灌提供土壤的墒情信息.实验证明:该系统具有可靠性高、成本低、实时性较强等优点,适合土壤墒情监测的需要.     

基于Zig Bee协议的温度湿度无线传感器网络

阐述了一种温度湿度智能数据采集的无线传感器网络,介绍了传感器节点的软件与硬件设计.该系统基于Zig Bee无线通信协议设计,克服了有线传感器网络的局限性,避免了其他无线通信技术的高功耗的缺点,节点成本低、网络容量大、生存周期长.实验结果表明:温度测量精度为1℃,湿度精度为3%RH,可以广泛用于环境检测.     

基于Zig Bee技术的智能车无线控制系统开发

针对连续位置数据采集的需要,开发了可移动智能控制系统,实现对智能车周边环境的实时监测。该系统由上位机系统、通信系统和下位机系统三部分组成。上位机由PC机构成;通信系统由2个ZigBee模块构成;下位机系统由智能车、GPS模块、ARM开发板构成。该系统基于Zig Bee 2007协议的点对点通信,以CC2530芯片为核心、以智能车为载体、以ARM微处理器为下位机主处理器。开发的系统减少了Zig Bee静态节点的数量,从而降低监控成本、静态固定采集点的使用、更方便地进行全方位准确监控。     

基于ZigBee的大水域水质环境监测系统设计

为了提高工厂化水产养殖的智能化水平,提出了基于Zig Bee协议的无线传感器网络（WSNs）的水质监测系统方案。设计了主要水质参数溶解氧、pH值、氨氮传感器的变送器电路,实现了对溶解氧、pH值、温度、氨氮含量等多参数的采集、处理,并通过无线网络传给终端节点,终端节点通过RS—232串口将数据传送给监测中心。测试表明：该系统实时性好,测量误差小,满足大水域水质监测需求。     

基于Zig Bee技术的家庭安防网络的设计

Zig Bee是一种新兴的无线网络技术。将Zig Bee技术应用于家庭安防网络设计,介绍了应用Zig Bee技术组建智能家庭无线传感网络的关键问题,分析了无线网络协议的机理结构和网络拓扑结构,完成了家庭安防系统的传感器设计。     

基于ZigBee技术的北方设施农业远程监控系统硬件设计

目前我国农业的自动化水平处于较低的层次,尤其是北方农业更为严重,因此大力发展农业的现代化管理具有非常重要的意义。针对上述问题,本文介绍了基于Zig Bee的设施农业远程监控系统的硬件设计,该系统采用单片机作为主控制器,布置在大棚内部的传感器可实时检测室内温度、湿度和光照强度等数据,同时通过Zig Bee协议将各分散的采集节点组成网络,以共享数据,使用此系统可以大幅度的提高农业生产的自动化水平。     

一种用于水质监测的WSNs节点的设计与实现

提出了一种基于无线传感器网络的水质监测传感节点设计方案,该节点由传感器模块、主处理器模块与无线通信模块和能量供应模块组成,其中传感器模块采用独立的模块结构,与主处理器之间由RS-485总线相连,主处理器与无线通信模块是以符合IEEE 802.15.4协议的CC2430芯片为基础设计的。多个传感器节点采用Zig Bee协议栈实现自组网,从而构建一个参数设置灵活、节点布置快速的水质自动监测系统。     

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.