基于模块PTR8000的无线数据通信

针对无线通信在测控领域的优越性,基于无线射频收发模块PTR8000,采用分层结构.利用特殊的通信协议实现了一种传输可靠、扩展方便、使用灵活的无线数据通信系统.介绍了无线射频模块PTR8000的结构、工作模式、射频收发流程以及片内SPI接口的配置,在此基础上分析了系统的硬件设计和软件设计.基于PTR8000的无线通信系统具有功耗低.多频道多频段的特点,可以很方便地实现点对点及点对多点的无线通信.可应用于遥感、遥控、无线抄表、工业数据采集及家庭自动化等领域.     

基于GPRS与CAN总线的水情智能监测系统的设计与实现

研究并开发了一种现场采用CAN总线进行数据采集,而利用GPRS进行数据传输的远程水位实时监测系统,该系统借助成熟的GPRS无线数据通信技术,结合TCP/IP通信协议,实现了CAN总线报文和IP协议的相互转换并通过GPRS无线网络和互联网传输CAN总线报文信息,进而对水库、河流等水情进行实时、可靠的监测.     

化工仓储企业储罐数据采集系统的设计与实现

针对化工仓储企业设备种类较多、各生产单元之间信息孤立、生产数据得不到实时准确测量等问题,设计开发了一个实时数据采集系统。该系统利用不同的数据通信规范,从各种异构系统中获取生产数据,并通过网络协议进行传输存储,实现了罐区数据的实时准确测量。该系统自投用以来运行效果良好,有效地解决了企业数据采集过程中存在的问题,对提高企业信息化水平具有重要的意义。     

蓝牙及系统实现技术

蓝牙作为一个全球开放性无线电标准,通过把各种语音和数据设备用无线链路连接起来,使人们能够随时随地实现个人区域内语音和数据通信的交换和传输。介绍了蓝牙技术及其特点、协议体系结构,阐述了其关键技术——射频、跳频、全球性地址及协议分层等。     

基于定向扩散的双向路由协议

根据高速公路气象监测无线传感器网络线形部署、数据接收点多和气象监测信息双向传输的特点,提出基于定向扩散路由协议的双向无线传感器网络路由协议,实现了高速公路气象监测数据的多点传输。经仿真测试,该路由协议实现简单、工作可靠稳定,能满足高速公路气象监测数据双向传输的要求。     

基于GPRS的自动售货终端的设计与实现

针对目前我国自动售货机远程监控方面的缺陷,提出了一种稳定、实时的售货监控系统方案.该系统采用GPRS网络实现自动售货机与远程监控中心的通信,并在此基础上设计出了适应于自动售货机的GPRS无线终端以及该系统信息传输的数据格式.通过该系统可以解决传输信息不及时,信息量有限的问题,使运营商能及时地获取自动售货机的相关信息,便于管理和维护.     

GPRS网金融POS系统通信协议及软件研究

提出了一种基于GPRS网的金融POS系统构建，采用RTOS技术、软件技术实现了PPP协议建立通信链路，用TCPhP协议进行各类命令和各类业务数据的高速、可靠传输。重点研究了信用卡授权中心与无线POS终端之间的实时数据通信流程、通信协议及其软件设计与实现方法。利用GPRS永久在线、通信速率高、按流量计费、支持标准TCP／IP协议的优势替换以往的POS终端，取得了良好的经济效益和社会效益。     

用于煤矿设备信息化升级的无线数据传输节点

针对现有煤矿无线数据传输技术存在多径效应显著、传输距离短、耐噪特性较差和灵敏度较低等不足,以及煤炭行业大规模设备信息互联互通的需求,设计了用于煤矿设备信息化升级的无线数据传输节点。该节点通过LoRa-CSS技术建立设备间的可靠无线数据通道,利用基于IP核结构的可编程片上系统PSoC灵活适配各种煤矿设备的数据接口,并采用统一规格化数据格式进行指令和数据信息交互。电磁隔离特性测试结果表明,该节点具有较强的隔离特性,不受冲击电压影响,可以有效地将短时高强度浪涌信号降到设备容限值以下。实际应用结果表明,各无线数据传输节点与上位机和煤矿设备之间的数据通信效果较为理想,可以有效地构建由中心站到设备的稳定数据传输通道。     

嵌入式多ARM架构的配电网自动化远方终端设计

配电自动化远方终端数据传输单元(DTU)装置作为配电自动化系统的基础设备,其稳定性尤为重要。通过对DTU装置系统的稳定性以及数据通信的稳定性和兼容性的研究,提出了将通信协议组(包括Modbus协议和IEC 60870-5系列协议)和STM32处理器相结合的设计方案。设计了系统软硬件的总体架构,并在嵌入式实时操作系统μC/OS-II上实现了兼容多种通信网络的通信协议组。实验结果表明,该配电自动化远方终端可靠地实现了DTU设备的稳定运行和数据信息的稳定传输。     

大型设备监控系统通信协议

针对大型设备监控系统在远程通信过程中大数据量传输及部分数据高实时性要求的特点,设计一种基于TCP的应用层通信协议,实现底层监测设备与监控中心间的可靠通信.协议提出了从监测设备到监控中心的安全登录方法,并能够根据实际需求,完成对个别参数或部件信息地实时传输.该协议具有较大的灵活性、可扩展性和安全性,能够满足大型设备监控系统中采集设备和监控中心之间的数据传输需求.     

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.     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.