智能家居安防系统设计

家居智能化已经成为当前家居发展的趋势,智能家居安防系统是智能家居系统的重要组成部分。随着社会的发展,人们对智能家居的安全性、便捷性等方面提出了更高的要求。本文设计了一种基于ZigBee无线网络传输技术的智能家居安防系统,有效避免了布线麻烦、维护维修不方便等问题。该系统通过各种传感器对家庭环境信息进行采集。由ZigBee无线传输网络中的终端节点和路由器节点将采集到的信息传输到协调器节点。协调器节点将对采集到的数据进行分析处理。当采集到的数据不符合标准时,协调器节点将报警信息通过串口传输给GSM网络模块,然后由GSM网络模块将报警信息发送到用户手机端。实验结果表明,该系统丢包率不超过0.1%,性能稳定,满足设计要求,具有一定的实用价值。     

基于无人值守的电网环境智能监测系统设计

针对目前电网设备无法实时监测预警以及人力、能源浪费现象,设计了一种基于自供能、无线传输网络和多传感技术的无人值守智能监测系统。该系统包括自供电能源管理模块、微控制器模块、多传感器模块、无线通信模块以及上位机。自供电能源处理模块采集当前环境中的太阳能并将其转换为3.3 V稳定电压为系统供电。多传感器模块采集当前环境中的温度、振动及声音信息传给微控制器模块融合处理,通过无线传输模块将数据信息发送给上位机进行实时显示预警。实验表明,系统工作性能优异稳定,适用于电网设备长时间的可靠监测。     

基于双MCU和nRF2401的无线传感器网络系统

基于无线传感器网络的理论和实现研究,提出了无线传感器网络系统.该系统由3个传感器节点和1个Sink节点组成.传感器节点采用MSP430F123单片机为处理器;Sink节点采用S3C2410为处理器,两者的无线传输模块均采用nRF2401芯片.经调试运行,该系统实现了小规模地区内温度信号的采集、传输和处理.运行结果表明,该系统可以作为无线传感器网络的实验系统,为无线传感器网络的研究提供实验平台.     

一种气象数据采集传输系统的设计

针对气象检测的需求,提出了一种基于手机和无线传感器网络的数据采集和传输方案,详述了系统设计的原理与软硬件的实现方法。系统以无线通信模块CC2430为采集节点,利用传感器采集数据,通过ZigBee实现对采集数据的无线发送和接收,并通过J2ME编程在手机上实现了气象参数的实时显示、存储和远程上传。本设计具有组网灵活、低成本、功耗小、可靠性高等特点.     

ISM频段无线热计量传感器网络节点模块的设计与开发

针对智能住宅建筑能效监管需求和现有热计量系统布线成本高、改造难度大的问题,将ISM频段无线收发芯片应用于无线热计量数据的传输过程中,对热计量传感器网络基本结构和工作原理进行了研究,开发了一种无线热计量数据传感器网络节点模块,设计了该节点模块的基本结构和主要电路,并重点介绍了其SPI接口连接方式及数据传输方法、无线收发芯片寄存器读写控制和热计量数据的无线收发过程。实验结果表明,所设计的无线热计量传感器网络节点模块在保证热计量数据稳定、可靠采集传输的同时,大大地增加了热计量传感器网络的灵活性和适用性,为住宅建筑能效数据的智能化采集、传输和管理提供了一种经济、高效的解决方法。     

基于ZigBee的穿戴式多生理参数WPAN

本文提出了基于ZigBee的多生理参数WPAN监护网络的设计方案.该方案以CC2430为核心器件,进行嵌入式ZigBee通信模块设计,包括集成各生理参数传感器的微型化RFD模块、带转发功能的Router模块、以及WPAN中心节点Coord模块.实验证明,该WPAN监护网络能实现生理信号的精确采集和无线传输,并可在星型和树型网络间自由切换.系统具有低功耗、微型化、无线化、高精度、抗干扰能力强等优点.     

无线传感网络温湿度采集系统的设计及实现

一直以来,低功耗以及远距离传输是无线传感器网络多点测量的两大不足,成为阻碍其进一步普及的瓶颈;利用无线传感网络分布式多点测量的特点,设计了基于IRIS节点无线传感网络的温湿度采集系统,介绍了系统整体框架和软件体系的设计及实现过程,并进行了温湿度采集实验;实验结果表明,节点可通过无线通信方式形成一个多跳的自组织网络系统,网络具有自愈功能,节点能够精确地采集和处理温湿度数据,节点间可以成功地进行通信,具有低功耗和远距离传输的优点.     

基于si4432的无线自组网抄表系统的设计

无线自组网技术在无线数据传输中占据重要地位,是无线数据传输的关键。基于si4432低功耗的无线自组网络的抄表系统,采用MSP430的主控芯片,能够快速、可靠地传输数据,具有传输距离远、性能稳定、功耗低、性价比高等优势。该网络主从节点,从从节点之间能够自动识别、组网,传输过程能够寻找最优路径;通过多级跳跃传输距离可达10 km以上。通过si4432对前导码同步字的识别机制,应用于模块间的地址识别,保证数据在制定模块间传输,可增大整个网络节点的数量和稳定性。该系统运行对水表数据进行了采集,结果表明该系统能够稳定、快速抄取水表数据,应用于水表等智能仪表抄表领域,可高效实现远程自动抄表。     

基于GSM的农田气象信息采集节点设计方案

针对传统农田气象信息远程监控系统采集机构布线难、成本高、传输距离有限等不足,提出利用GSM网络覆盖范围广、价格低廉等优势设计的无线网络采集节点方案,阐述无线网络采集节点的硬件构成、通信原理和具体实现方法。实验表明,该设计方案合理可行,能实现农田气象信息的定时采集、稳定传输和实时报警。     

无线3G交通监控与事故防范系统的方案设计与实现

针对当前交通监控系统的诸多不足,提出一种基于无线3G的交通监控系统的方案。该系统前端监控节点可对交通视频图像以及天气状况等多种信息进行采集,并且依据相关信息分析路况,对可能出现的事故进行防范预警。节点通过3G网络传输数据,可以根据需要灵活移动。后端由多个不同功能的服务器组成,将前端的视频信息重新封包,使用RTSP协议进行传输,气象等相关数据储存在数据库中。后端结合视频图像以及气象路况信息对事故隐患进行二次判断。实验表明,该系统能够准确获取信息,达到设计要求。     

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     

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.     

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.     

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.