家居智能安全远程无线监控系统的设计

为实现对家居环境的远程和无线控制,提出了一种将无线通信技术与以太网接入技术整合进行家居环境安全智能监控的设计方案;该方案根据家居环境安全的实际需要,选用相应传感器进行环境变量的数据采集,利用无线射频通信方式进行数据传送;并通过以太网接口芯片ENC28J60实现以太网接入,达到对整个家居环境安全进行远程监控的目的;文中介绍了该系统的硬件结构及软件设计流程,阐述了本方案的具体应用;经与远程终端的联通测试,表明该系统能够实现Ping通及接入以太网,从而满足设计需要.     

一种IPv6无线传感器网络以太网接入网关的设计

为了实现将IPv6无线传感器网络接入以太网,在分析现有接入系统不足的基础上设计了一套接入系统.在该系统中,设计并实现了基于嵌入式处理器ATmega128、智能射频芯片CC2420以及网络控制芯片RTL8019的接入网关设备.该设备可以将基于IEEE802.15.4的IPv6无线传感器网络接入以太网.采用模块化设计,引入了硬件抽象层和设备适应层相结合的软件驱动模式.说明了系统中数据与协议转换的基本原理.实验表明通过该设备能够灵活地完成网络间通信,具有应用价值.     

基于EPON的无线接入分析

在高速发展的经济的推动之下,互联网中涉及到的业务越来越多,单纯依靠以太网无法满足人们对宽带的要求,因此EPON系统应运而生。通过调查可知,一些商业用户已经应用EPON系统来进行交易,但是由于人们对EPON系统的研究还不够深入,研究人员还没有掌握EPON的无线接入的方法,所以只有一部分人才能实现宽带无线接入,从而获得更多的信息。为了满足人们对宽带的要求,本文将着重介绍EPON系统,分析EPON系统无线接入的思想,探讨基于EPON的无线接入情况,并根据相关案例来提高技术人员对EPON的认识,以此来加快我国研究人员对EPON的无线接入的认识,帮助科研人员找到准确的方法来实现EPON的无线接入,最终加快我国现代化建设。     

无线Mesh技术在煤矿工作面通信系统中的应用

针对现有煤矿有线、无线通信系统难以在工作面应用的问题,提出了一种基于无线Mesh技术的煤矿工作面通信系统设计方案,主要介绍了该系统的结构、无线Mesh基站的设计及系统功能指标等。该系统带宽高,路由更新时间不大于10s,无线覆盖距离不小于1km,并可接入井下工业以太网,实现对矿井工作面的无线网络覆盖。     

支持多种接入方式的无线网关的设计与应用

在研究多种通信模式的网络设备基础上,提出一种支持多种接入方式的无线网关的设计方案,实现多种通信模式的异构网络与无线传感器网络的通信,详细论述了网关的硬件设计与软件设计,并将其应用于工业无线监控系统中,结果表明,网关能够在实际网络中运行。     

Internet视频监控系统网络接口设计

为设计基于Internet技术的视频监控系统,采用了PHILIPS-ARM芯片的最新内核Cotex-M3,以LPC1768处理器为核心,DP83848为以太网物理层收发器,实现了两个不同内网间穿越Symmetric型NAT网关通信;实验表明,该硬件设计为上层协议栈等软件提供了良好的支持,具有良好的稳定性和可靠性,实验效果好,满足设计要求;文中在给出了硬件设计方案的同时,着重介绍嵌入式设备接入网络的底层设计方法,并描述了软件设计过程。     

现代化矿井通信技术与系统

提出了由矿用有线调度通信系统、矿井移动通信系统、矿井广播通信系统和矿井救灾通信系统等组成的煤矿井下通信技术体系。提出矿用调度通信系统应采用矿用有线调度通信系统。提出全矿井移动通信系统宜采用WiFi、3G、4G等通信技术。提出矿井广播通信系统既可采用矿用有线调度通信系统远程供电广播技术,也可采用基于以太环网和无源光网络的IP通信技术。提出矿井救灾通信系统应采用无线多媒体通信技术,宜采用WiFi和MESH等通信技术。提出矿井移动通信系统应满足手机脱网通信、基站脱网通信、无线自组织网络、接入煤矿井下有线宽带传输平台等要求。指出在手机脱网通信、接入煤矿井下有线宽带传输平台、无线自组织网络、矿用无线摄像机、基站脱网通信、多功能矿井移动通信系统、矿井无线宽带传输等方面,WiFi优于WCDMA、CDMA2000和TD-SCDMA。提出多功能矿井移动通信系统和矿井无线宽带传输宜采用WiFi。     

国产化操作系统Reworks的嵌入式网关软件设计

随着航空平台信息化程度的提高,机载任务系统需要采用TCP/IP协议与地面系统进行无线组网,本文基于国产化操作系统Reworks设计了一套可复用嵌入式网关软件框架,在不增加硬件成本条件下,对现有机载通信设备进行软件升级实现IP支持能力,将机载任务以太网与通信设备高速互联,通过无线网络接入地面系统,实现了空地一体化IP组网通信.此技术已经在某型通信系统中得到了成功的应用.     

高速铁路宽带无线接入网的分析与设计

随着我国高速铁路网的大规模扩张,原有的铁路无线接入技术在数据传输速率方面已经不适应新的通信业务需求,因此在铁路通信系统的无线接入专网中引入宽带无线通信技术已经成为必然趋势。结合高速铁路的通信业务需要,根据CTCS列控数据传输标准对铁路通信系统的QoS保障要求,分析比较了当前宽带无线通信协议中的几种接入网架构,并设计了高铁宽带无线通信接入网架构。     

基于Cortex-M3的以太网硬件设计

传统的嵌入式以太网硬件方案一般包括了一片微控制器或微处理器芯片和一片负责以太网通信的专用芯片.这样的设计方案导致了较大的PCB面积以及由于多芯片的使用而导致的潜在的稳定性问题.提出了一种基于LM3S6100的ARM Cortex-M3微控制器的嵌入式以太网硬件设计方案.在该控制器中完整集成了包含PHY和MAC功能的以太网控制器,因此,能够单芯片配合外围元器件实现以太网接入.这样的硬件设计方法提高了系统的稳定性并且大大减少了设计和制造成本.详细介绍了核心硬件电路的设计方法,其硬件方案的样品已经设计制造成功,样品测试正常,工作稳定可靠.     

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.