基于ZigBee的铁路货场线网络技术研究

本文简述了ZigBee网络协议栈、网络拓扑结构及网络特性,并根据ZigBee网络的自组织特性提出一种基于ZigBee技术的两层无线网络组网结构。该网络由安装在货物车辆上的无线终端节点、货场中的中心节点（中继节点）和安装在控制室的网络中心节点构成,可实现货物的动态实时管理控制。     

特种货物无线标识系统研究

简述了我国铁路货运管理的现状,并根据802.15.4工作组定义的ZigBee无线连接技术的极低复杂度、低成本、低功耗和低速率和可选的安全性的优点,提出了一种基于无线网络技术的两层无线网络组网结构.该网络由安装在货物车辆上的无线终端节点、货场中的中心节点(中继节点)和安装在控制室的网络中心节点构成,可实现货物的动态实时管理控制.     

低能耗无线传感器网络节点的设计

该文介绍了基于IEEE802．15．4标准的无线通信协议ZigBee的协议结构和技术的特点,以降低能耗、节约成本为出发点,从硬件和软件两方面．提出了基于ZigBee的无线传感网络节点的基本构架,设计了一种通用节点的软硬件平台。     

移动ZigBee节点无线传感器网络建模与性能仿真研究

在如智慧医疗等众多ZigBee无线传感器网络应用中,网络节点的移动常常不可避免,为保证移动节点在网络中的泛在通讯能力,研究节点移动引起的网络性能变化十分重要。论文首先对OPNET仿真开发平台的网络层进程域模型进行改进,利用状态转移过程模拟节点移动进程特性,优化节点路由协议,改善基于OPNET的ZigBee无线传感器网络模型组网能力及网络阻塞状况。其次,仿真研究移动节点数量、移动节点速度对三种拓扑结构ZigBee网络的MAC负载、MAC延迟、端到端延迟性能的影响。仿真结果表明,随着移动节点数量以及速度的增加,簇状ZigBee网络负载承受能力最好,星型ZigBee网络在延迟方面表现出更大优越性,综合考虑负载和延迟两方面性能,网状ZigBee网络具有更大的优势。     

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。     

ZigBee接入EPA控制网络的研究

在分析ZigBee技术的基础上,对ZigBee技术接入EPA控制网络进行系统建模和设计,给出ZigBee接入EPA控制网络的模型和方案;利用ZigBee通信模块实现ZigBee温度监控模块与ZigBee接入点间的通信,并给出通信实现过程。测试表明,ZigBee接入EPA网络具有可行性,且运行稳定,工作可靠。     

ZigBee无线通信网络节点设计与组网实现

随着ZigBee技术的迅速发展,ZigBee无线通信网络在智能家居中得到越来越多的应用;简单介绍了ZigBee协议的架构,设计了由MSP430单片机和CC2420射频芯片构成的ZigBee无线通信网络节点,系统地分析了节点硬件结构及加入网络的软件流程,详细阐述了多个节点的网络拓扑方案;通过试验测试表明,该网络节点具有较好的稳定性和较高的通信效率,可以满足智能家居对无线通信网络传输及组网要求。     

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。     

基于互联网服务器的海量ZigBee节点管理系统

为解决海量ZigBee节点的组网与集中管理问题，文章提出一种基于互联网服务器的多ZigBee网络结构管理设计方案.系统将海量节点拆分为多个ZigBee网络结构，各个网络之间的设计不存在耦合，可摆脱无线传输的距离限制.每个独立的ZigBee网络中除终端节点与ZigBee协调器外，新增一个可接入互联网的控制器来组成内网结构.内网中的ZigBee节点利用Z-Stack协议栈实现自组网功能，控制器主要用于实现节点与服务器之间的通讯.文章提出中央服务器的概念作为外网结构的核心，用于维护中央数据库内所有节点的状态信息，同时对客户端提供Web服务.客户端对于系统内任意节点的查询或控制操作均由中央服务器代理完成.经测试表明系统运行可靠，扩展性强，具有一定参考价值.     

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。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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.     

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。     

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.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

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     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.