面向有毒气体监测的无线传感器网络系统的实现

针对化工企业在生产过程中对有毒气体监测的需要,提出了一种面向有毒气体监测的无线传感器网络系统。该系统由ZigBee网络和计算机监控中心组成。ZigBee网络采用网关节点、路由器节点和传感器节点构建树状网络拓扑结构。所有节点硬件利用片上系统CC2530通信模块实现片上系统方案,节点软件利用TI公司推出的ZigBee协议栈软件Z-Stack进行开发。系统实验测试表明:基于ZigBee的无线传感器网络系统具有组网灵活,节点数量多,覆盖面广的特点,较好地解决了大区域监测环境下易于产生监测盲区的问题。     

矿井火灾环境信息动态感知与应急隔离系统

火灾区域隔离是有效控制火灾发展和蔓延的主要方法,能够切断次生事故的反应链,缩小火灾影响范围。针对常用的火灾密闭隔离措施无法对密闭环境进行实时动态监测及预报的问题,设计了矿井火灾环境信息动态感知与应急隔离系统。在预先判定的危险区域布置监测节点,通过多参数传感器和红外摄像仪对多个测点的环境信息进行同步采集并传输至地面监控平台。当监测到异常数据时,系统报警并通过远程控制方式控制密闭隔离装置开启,实现密闭囊袋充填,囊袋通过预设滑轨传动系统从存储仓扩展至整个断面,实现应急密闭隔离。通过高精度压力传感器对囊袋内部气压进行实时监测,当囊袋内部压力低于安全范围下限时,启动囊袋自动补气装置,为囊袋补充气量;当内部压力达到设定范围上限时,自动停止充气,以提升密闭效果。现场试验结果表明,该系统实现了火灾环境参数实时采集和报警、密闭隔离装置远程控制等功能,密闭囊袋可在5min内完成开启,停止充气后,囊袋内部压力基本保持稳定,满足现场应用要求。     

基于ZigBee的隧道结构安全实时监测系统设计

为避免隧道在施工过程中发生事故，针对隧道结构安全监测设计了一套完整的监测方案。该方案基于ZigBee无线通信方式，结合施工隧道特定的场景，设计了隧道结构安全监测的传感器节点、中继节点以及网关节点，并提出一种新的隧道监测数据传输策略。该系统在实验室环境下进行测试，实验结果显示，设计的监测方案各项指标能够适应在建隧道结构安全监测的需求。     

移动云环境中基于节点自适应配置的可靠服务架构

为了解决移动云计算系统中因链接断开和网络分区对服务可靠性的影响问题,提出一种基于服务副本管理和节点自适应配置的服务软件架构。其由通信中间件、监测系统、上下文管理器以及副本管理器组成。根据监测到的服务需求和节点信息,副本管理器通过一种自适应配置算法来激活或休眠节点,使任务能够在当前最适合的节点中执行,以此提高计算服务系统的可靠性。案例结果表明,该方案能够保证动态网络环境中的服务可靠性。     

基于4G无线通信技术的湿地水质COD在线监测节点设计

高效动态掌握城中湿地水体COD数据对常规地表水质监测具有重要意义。针对实验室分析COD效率低下，ZigBee网络节点通信距离有限等问题，设计了基于4G无线通信技术的湿地水质COD在线监测节点。该监测节点主控MCU选用了TI公司MSP430系列超低功耗单片机，工业级COD传感器通过隔离式RS485通信接口读取传感器数据，COD数据经4G LTE DTU模块发送至云服务器。节点采用太阳能电池板和锂电池的组合供电模式，软硬件系统采取了多种低功耗设计，保证了节点长期稳定运行。经试验分析，该监测节点运行可靠，COD数据采集精度满足要求。     

P2P系统的信任研究

由于P2P系统的开放、匿名等特点,使得P2P系统对节点缺乏约束机制,节点间缺乏信任。针对以上问题,本文提出了一种新的P2P系统信任模型,该模型根据系统中节点的历史交易情况和系统中其它节点的推荐计算节点的信任度,节点根据计算的结果决定是否进行交易。仿真试验及分析表明,该模型能有效地评估节点的信任度,隔离恶意节点,提高下载成功率。     

面向环境监测的无线传感器网络节点的软件设计

环境监测是无线传感器网络的重要应用领域。本文介绍了一种无线传感器网络节点的软件设计方案,该方案利用了基于ZigBee技术的射频芯片CC2430。节点的软件设计基于任务调度机制,用于监测某一区域内空气温湿度和土壤温湿度等环境信息。实验结果表明,节点工作状态稳定,故障率低。节点可以按照用户设置,准确地对环境信息进行采集。整个系统具备数据可靠、功耗低、可远程控制等显著优点,具有广阔的应用前景。     

温室环境无线监控系统设计

为提高温室环境监控的效率,针对传统的有线温室监控系统接线复杂和节点放置不灵活等缺点,提出一种基于无线传感器网络的温室环境监控系统的方案,并详细给出主节点和子节点的软硬件设计方案。试验结果表明,系统具有运行可靠、成本低、组网灵活以及人机交互界面友好等特点,实现了温室环境的本地监控和远程监控,能够满足当前我国温室环境监控的实际需要。     

基于云平台的选煤厂环境监测系统

选煤厂环境复杂、监测面积大、监测点数量多且分散,环境参数的人工定点定时采样方式实时性差、数据准确率低,有线监测系统部署不便、成本高、线路易损坏,基于NB-IoT与LoRa技术的无线监测系统网络覆盖不足。针对上述问题,采用ZigBee无线传输技术,设计了基于云平台的选煤厂环境监测系统,介绍了系统架构、监测节点(终端节点、路由节点、网关节点)的软硬件设计及云端数据管理软件设计方案。该系统通过终端节点对选煤厂环境参数进行实时采集与处理,由路由节点汇总监测数据并转发至网关节点,网关节点对数据进行封装处理后,通过以太网上传至云平台服务器,由云端数据管理软件实现数据存储、分析与展示。测试结果表明,该系统运行稳定,数据传输准确,可实现选煤厂环境参数实时监测与告警、历史数据查询等功能。     

基于车载GPS终端的城市环境健康监测平台设计

针对当前应用的空气质量监测系统定点、定时监测存在的范围局限、实时性差等问题,设计并研发了基于车载GPS终端的城市环境健康监测平台系统。系统包括车载环境感知节点、数据服务中心和PC监测终端。以STM32为主处理器的环境感知节点采集SO2、PM2.5、温湿度等空气质量信息,通过SIM5320模块获取节点的实时位置信息并与数据服务中心进行数据通信。PC监测终端可实时查看节点当前位置的空气质量状况,并绘制区域空气质量分布监测云图。系统实时准确地监测环境质量状况,弥补了当前宏观环境监测的不足,为有效控制污染及解决环境问题提供了有力参考。     

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.     

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     

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.     

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.