工程机械远程监测系统中ZigBee网关的设计

以工程机械为对象,研究并设计了一个基于ZigBee无线采集网络和GPRS远程通信的实时远程监测系统的无线网关,该网关由ZigBee协调器模块以及GPRS模块组成,以STM32为网关的核心控制器,并对ZigBee协调器和GPRS模块分别进行选型、硬件及软件设计。实现整个实时监测系统需要的相关技术有:ZigBee无线网络、GPRS、TCP/IP通信技术、Z-stack协议栈。     

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.     

远程监护系统中ZigBee网关的设计

ZigBee是一种新兴的无线通信技术,本文介绍了一种基于ZigBee的无线网关设计方法并应用到远程监护系统中。完成后的网关设备能实现数据从ZigBee无线传感器网络到互联网的转换,且有较好的通用性,有着广泛的应用前景。详述了该基于双MCU网关的硬件设计方案和在ZigBee协议与TCP/IP协议传输数据的软件编程思路。     

基于ZigBee与GPRS智能医疗监护网关设计

为了实现传感器网络的远程监护,结合ZigBee和GPRS各自的优势和特点,提出了一种基于ZigBee通信技术和GPRS移动通信网络相结合的物联网网关设计方案。该方案基于高速低耗的主控单片机来实现ZigBee协议、TCP/IP、GPRS和GSM的协议之间的转换,可运用于医疗监护及各类需要无线接入物联网的数据处理转发需求,并通过互联网云端Yeelink平台实现远程监测数据的功能。实际测试结果表明,该系统稳定可靠,方便扩展、实时性强。     

基于ZigBee技术的医院供水管网水质监控系统

针对医院供水管网水质问题,设计了基于ZigBee无线传感器网络的水质实时监控系统。监控系统由末端的不同传感器采集水温、pH值、电导率水质参数,通过ZigBee无线网络传送给网关,网关实现ZigBee和TcP/IP协议间的转换后,将数据传送给监控中心进行存储、分析和处理,监控中心可发送命令控制整个网络。该方案不仅可以实现本地和远程水质实时监控,而且很容易应用于其他环境下的水质实时监控。     

ZigBee和GPRS技术在水文监测系统中的应用研究

结合ZigBee和GPRS技术的特点和优势,提出了一种无线水文监测系统解决方案。重点分析了网络协调器节点的软件设计,包括ZigBee协议和GPRS网络连接的实现方法以及ZigBee和GPRS网络数据转换任务的设计。     

基于ARM／GPRS／ZIGBEE水产养殖远程监控系统设计

为了满足水产养殖智能化的要求,设计了水产养殖中水质参数的远程实时监控系统,该系统由基于传感器节点,汇聚节点的水质参数无线监测网络和远程数据管理节点组成。采用以CC2430为核心的ZigBee模块传感器节点方案,构建基于ZigBee协议的无线传感网,实现水质数据采集;应用以ARM9微处理器S3 C2410开发的汇聚节点实现数据的汇聚和GPRS无线通信实现远程数据的传输。利用ZigBee技术和GPRS技术,此系统不仅满足了无线数据采集和数据传输的相关指标要求,而且有效地解决了水产养殖系统中布线困难、节点不可移动、不易维护等问题,满足了水产养殖中水质监测的需要。     

基于ZigBee-GPRS技术的无线传感网络

结合ZigBee和GPRS技术,提出了一种基于二者优势互补的无线传感网络系统实现方案。该方案综合ZigBee技术在短距离、低功耗无线通信和GPRS网络远程数据传输的优势,利用具有ZigBee收发功能的芯片MC13192设计多种类型传感器节点、具有GPRS通信功能的芯片GR47设计ZigBee-GPRS网关,实现了多种参数的实时与远程监控。其技术具有广阔的应用前景。     

基于W5100的无线传感器网络网关设计

介绍了基于W5100的无线传感器网络网关设计,实现了ZigBee无线网络和因特网的相互连接,方便服务端对Zig-Bee网络节点的远程控制和管理,实现远程感知与管理。给出了基于W5100和μC/OS-II的无线传感器网关设计方,实现了软硬件设计,完成了ZigBee网络与因特网之间数据的透明传输和协议转换。     

基于物联网和云计算技术的葡萄园监测系统研究

针对葡萄园精准化、信息化、智能化的发展要求,提出了将云计算技术和物联网技术运用于葡萄园环境数据监测系统,通过传感器、ZigBee无线网络、GPRS技术和云计算技术,系统实现了对葡萄园环境的光照强度、大气环境温湿度、CO_2浓度、土壤湿度、土壤PH传感数据等五类参数的实时监测,同时能够控制设备以调节环境参数设计中使用ZigBee模块搭建了星形无线传感网络,远程网关通过下CP/IP协议和GPRS网络与云服务平台进行数据的双向传输。云服务平台为Web浏览器和手机App终端提供数据并存储控制指令。     

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.