基于ARM9的嵌入式无线智能家居网关设计

针对传统智能家居系统中多种无线通信技术之间互联的困扰,设计了一个新的两种无线通信技术直连的智能家居网关。该网关以ARM920T嵌入式处理器S3C2440A为核心,ARM Linux为实时操作系统,采用新兴的Zigbee与Wi-Fi融合的通信技术,以满足家庭远程监控、家庭安防和家电控制的个性化需求。在ARM9处理器上构建嵌入式Web服务器,通过扩展Wi-Fi模块与Zigbee模块实现家庭内部无线网络的建立以及与Internet的连接,并给出了硬件组成结构和软件实现流程。实验结果表明,该网关在丢包率与时间响应方面优于有线网关和Wi-Fi—蓝牙网关,适合在智能家居系统中应用。     

基于Wi-Fi的家庭多终端无线上网解决方案研究

Wi-Fi是一种无线联网技术,通过它能够完成多个智能终端网络设备的无线连接。本文针对家庭日益增长的无线上网设备网络连接的需要,提出了利用无线宽带路由器实现计算机,平板电脑和智能手。     

一种手机平台控制的轮式探测机器人的设计与实现

本项目建立了一个远程实时控制系统,机器人利用摄像头将其采集到的视频信号压缩后,经过Wi-Fi模块通过无线网络传输技术将数据传送到控制端(手机),解压缩以后反应在控制端平台上,控制者通过这些信息发出相应的控制信号,系统再通过Wi-Fi模块将控制端的控制信号传输到远程终端(机器人),远程终端在ARM平台下的Linux嵌入式系统中对信号进行解析并进行相应操作响应,实现控制端对与轮式探测机器人的实时操控。     

当心被篡改 Wi-Fi也要做“体检”

病毒名称:Wi-Fi网络篡改传播途径:某厂商多款路由器存在安全漏洞,黑客能够通过漏洞控制路由器,监控用户的电脑、手机、Pad等所有设备的上网行为,伺机窃取网银和网购账号密码,甚至挟持用户访问钓鱼网站行为分析:很多家庭现在都安装有无线路由器,但是大多数用户没有修改路由器默认密码的意识;采用低等级加密(WEP),Wi-Fi密码容易被破解蹭网;使用默认的路由器管理IP地址;路由器固件存在漏洞,用户不知如何修     

ZigBee和Wi-Fi组成无线网关的干扰及共存机制

鉴于ZigBee技术的低功耗、低成本、低复杂度的特性和Wi-Fi的组网方便、易扩展、高数据速率、高功耗的特点,采用新兴的ZigBee和Wi-Fi融合通信技术组成智能家庭网关,能够很好地满足家庭远程监控、家电控制和家庭安防等个性化的要求。但由于它们所使用的是相同的2.4GHz频段,彼此间会不可避免的出现干扰,对ZigBee和Wi-Fi本身的抗干扰性能和共存机制进行分析,可以很好地避免彼此间的干扰,并能改善其共存特性。     

基于ZigBee技术的智能家居控制系统的设计

通过对近年来智能家居的研究,以S3C6410为智能网关的核心处理器,应用ZigBee无线传感器网络、嵌入式、Wi-Fi等多种技术,设计了一套智能家居系统。用户可利用手机远程监测家庭情况,并对家电设备等进行控制。实现了防盗自动报警、灯具自动控制、家庭环境监测、远程控制电器设备等功能。     

把Wi-Fi 6带到你家 小米AloT路由器AX3600

近几年,小米一直在奋力打造其智能家居生态链,路由器作为小米智能家居生态链的核心产品之一,其重要性自然不言而喻。目前,小米已经推出了多款分别涵盖高端、主流和入门级市场的路由器产品。随着Wi-Fi 6逐渐部署到消费级市场,小米也推出了一款支持该无线通信技术的产品—小米AIoT路由器AX3600。     

两居神器 超值双天线路由器导购

正很多家庭都是两居室,并且喜欢把路由器放在客厅里。此种情况下,我们只需购买一台双天线路由器,并把两根天线分别指向两个卧室,便可轻松实现Wi-Fi信号全覆盖。目前,市面上的超值低价双天线路由器,普遍都采用了低功率常规设计。也正是因此,如果卧室采用了木门,那么Wi-Fi信号全覆盖基本没什么问题。而卧室如果采用了金属包皮的装潢门,那么就一定要购买"穿墙"路由器才行。由于卧室使用金属包皮门的并不多,所以不在本文讨论范围。搞定卧室木门     

基于CC3200的设备电源远程控制系统设计

针对工业设备电源接入无线网络实现远程监测与控制的要求,设计了一款基于CC3200的数据实时监测和远程控制系统,并给出了硬件和软件设计方案。系统采用CC3200内嵌的应用MCU对电源进行信息采集和控制,采集的数据通过内嵌的Wi-Fi网络处理器无线传递到本地服务器并存入SQL数据库中,而来自终端的控制命令通过Wi-Fi处理器接收并送给应用MCU处理。实验结果表明系统运行稳定可靠,灵活高效,具有良好的应用前景。     

无线变有线 巧为老电视升级Wi-Fi

正前几年购买的Android网络电视大多没有Wi-Fi功能,如果要配备无线网卡,我们就必须购买特定型号的专用无线网卡,这给老电视的Wi-Fi升级带来不便。其实现在的无线路由器都支持WDS无线扩展技术,我们可以利用无线路由器接收上一级的Wi-Fi,然后再借助网线就可以让老电视实现无线上网了。这里我们以水星MW305R路由器设置为例。首先要确认主路由LAN口的IP地址,为了描述方便这里假设主路由为A,使     

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.