J2ME移动远程控制应用的研究

讨论采用J2ME技术实现移动远程控制应用的方法.方法在手机端采用MIDP里的HttpConnection接口技术,PC端采用Servlet技术,并实现了手机对PC机的远程控制.方法可运用于智能居家、家电信息化等,推动物联网发展普及.     

基于串口通信的电站监控系统设计

提出了一种基于串口通信的电站监控系统的设计方案,重点介绍了该系统发送端、接收端的软硬件设计及通信设置。该系统采用PLC作为发送端控制器,实现对电站及旋转UPS参数的采集、处理及控制功能;接收端采用PC机,通过VB语言编程实现电站"三遥"功能;PLC与PC机通过串行通信端口通信。该系统还在任务保障性、可维修性、可操作性方面进行了特殊设计。应用表明,该系统操作方便,性能可靠。     

面向集散式人工气候室智能监控系统的人机界面设计

随着人工气候室技术的推广,设计简便友好的人机界面成为提高人工气候室智能监控系统效率的关键.在提出集散式人工气候室智能监控系统的基础上,设计实现了系统上位机(PC端)和下位机主机端人机界面.其中上位机PC端人机界面采用Windows/VC6.0实现.下位机主机端人机界面采用19264图形点阵液晶屏配合按键在双串口芯片W77E58的控制下实现,并给出了主机端人机界面的软件设计方法.采用此人机界面使得系统操作更加简便直观.     

基于Android 和二维码的实训室管理系统的设计 与开发——以广州民航职业技术学院为例

为了方便实训室的管理,文章探讨了一种基于Android 和二维码的实训室管理系统的设计方法。该管理系统 包括手机端和PC端程序,其中手机端是基于Android 平台实现的,功能包括实训室使用情况、设备维护、安全检查和调课信息 等;PC端采用Delphi 语言实现设备维护、设备录入、数据管理和统计报表等功能。该系统在Windows XP和Android 手机上经 过测试,结果表明能有效提升实训室管理的工作效率,值得推广。     

基于Android的脑电信号无线采集与分析系统设计

提出一种基于Android平台的脑电无线采集与警觉度监测终端的设计。采用Wi-Fi作为无线通信方案,以Android手机作为上位机,在手机上设计应用程序,通过手机应用程序可以方便地实现对采集设备的参数设置、无线连接、数据接收、波形显示、数据分析和文件存储。Android手机端通过Wi-Fi与下位机建立通信,实时接收Wi-Fi模块发送的脑电数据,绘成脑电图,并能通过手机端向下位机发送控制命令,再将基于极限学习机的脑电信号分类算法通过Java编码移植到手机内部,分析脑电信号所携带的警觉度信息。立足便携式脑电信号无线采集系统,在系统中加入基于Android系统的传输控制方法,并植入训练速度快、分类效果好的算法程序,为便携式脑电信号采集提供了一个新方案。     

基于单片机的热气机监控系统设计与实现

为了实现对热气机加热端管壁温度和燃烧室压力的监控,以PIC18F6722单片机作为控制逻辑算法核心设计了热气机监控系统,文中介绍了监控系统的整体设计、控制策略、硬件和软件设计等设计方法,还采用PC机作为上位机,使用组态王软件设计了人机对话窗口;监控系统在热气机发电机组实际使用中,采用PID控制完成了热气机加热端温度控制,其控制精度为±5℃;通过穿越逻辑控制与二进制相结合的方法成功实现热气机燃烧室压力控制,将其压力控制稳定在2.8±0.025 MPa内,同时还将排气阀使用时间提高了6倍;该监控系统也可为热气机性能仿真、优化设计和热气机性能优劣判定提供了相关数据.     

基于Android手机与远程PC的UDP文件传输机制

介绍一种Android手机与PC间文件传输的方法及其实现技术.通过分析Android SDK和Windows SDK中相关API接口,实现Android手机应用软件与PC的Windows软件之间的UDP协议文件传输.该机制在手机端采用Eclipse并运用java语言开发,在PC端采用Visual C++并运用C语言开发,同时在机制中增加了各种改进UDP协议的算法.实验结果表明,该机制提高了UDP协议传输的效率和可靠性,能够很好实现文件在手机与PC间的传输.     

基于Bootstrap框架实现响应式布局

随着移动设备的广泛使用,移动设备已经成为网页浏览的主流设备,为了使用户在PC端与手机端都能拥有良好的浏览体验,同时避免在PC端与手机端应用两套代码的繁琐工作,响应式设计应时而出.文章详细介绍了响应式布局的概念,实现响应式页面的不同方法,应用Bootstrap快速搭建响应式页面的方法及其原理,并通过案例介绍如何设计一个响应式页面,以及实现响应式页面的具体步骤和在不同设备上呈现的效果.     

WiFi控制的无线音乐播放系统设计

以STM32F103作为微处理器,设计了一个低成本的无线WiFi音乐播放系统,结合接收WiFi数据的WM-G-MR-08(wm631)模块和VS1003B音频解码器实现了MP3音乐播放。基于Android系统开发的客户端软件采用手机控制,完成了手机端与控制端之间的数据传输,实现了手机远程对音乐播放器的控制。结果表明,该系统设备简单方便、成本较低、系统可靠、易于扩展。     

移动端的小型智能家居设计

针对家庭内部的应用坏境,对智能家居控制端进行分析和研究,基于Android手机平台设计了一套智能家居系统的Android手机控制端:利用Android提供的各种方法和途径建立智能家居的手机端控制软件;并利用Socket通信实现了TCP/IP协议族的TCP协议;通过手机实现了控制网关通信。     

IP Mobility Issues for a Mobile Tele-Robotic System-NEPWAK

The network-centric applied research team (N-CART) is continuing its work on an ambitious project known as the network-enabled powered wheelchair adaptor kit (NEPWAK). It introduces techniques for modifying and using powered wheelchairs as mobile platforms enabling communication and remote control. The wheelchair is equipped with a laptop computer, a CCD camera and a wireless network interface card (NIC) for 802.11b Internet access. The laptop acts as a server allowing network clients to gain access through a custom control interface on the chair. The remote controlling client receives a video and audio feed from the chair and sends control signals for maneuvering. While traveling, the chair is able to change its network association from one access point (AP) to another within the same subnet-the process is known as handoff. However, there is no inter-network handoff mechanism presently available in IP networks. This restricts the mobility of the wheelchair to within the coverage area of the subnet APs. This paper shows that the Internet engineering task force's (IETF) network layer mobility protocol-Mobile IP suffers from large handoff latencies that can hinder communication between the client and the wheelchair during handoff. Mobile IP alone is not a sufficient solution for a mobile telebotic system such as NEPWAK. An interesting solution to the handoff latency problem comes from the Fast-handover protocol described in Section 4.4 with simulation results in Section 6.2.     

集成WAP与SMS的家庭网系统

文中提出一种家庭网系统(HNS)结构，它集成了WAP协议与短信服务，支持家庭网与Internet／GSM间的连接。整个系统包括HNS网关和三个家庭网子系统(家具子系统、安全子系统和消息子系统)，其主要目标是通过便携电脑或GSM移动终端远程控制和监视家庭设备，除了能对远程查询作出反应外，被管理设备还能在非正常情况下主动向移动终端发送警报消息，通过HNS网关，监视与控制信息能发向Internet／GSM。另外，文中还就系统的实现方法给出了一些实用性建议。     

The impact of laptop-free zones on student performance and attitudes in large lectures

The goal of this study was to determine if laptop use in lecture negatively impacts learning outcomes of surrounding students taking notes on paper. Two sections of a large introductory biology course (>400 students/section) were zoned into a laptop-permitted and a laptop-free area. Two sections in which laptop users could sit anywhere served as the Control. There was no difference in the attendance (∼85%) or percentage of students using laptops (∼29%) between Zoned and Control sections. Academic performance, based on exam points earned, was not significantly different for paper users in Zoned and Control sections indicating laptop use did not impair the overall achievement of surrounding students. However, there was a correlation between exam performance and note taking preference: paper note takers scored significantly higher and laptop users scored significantly lower than predicted by pre-class academic indicators (p < 0.01, paired t-test). The majority of both laptop (64%) and paper users (82%) in the Zoned sections supported a policy restricting laptop use to specific areas. Thus, while we further investigate whether the relationship between laptop use and performance is correlative or causative, zoning is an effective method for accommodating both laptop users and paper note takers in the same lecture hall.     

Effcient Distributed Skyline Queries for Mobile Applications

In this paper, we consider skyline queries in a mobile and distributed environment, where data objects are distributed in some sites (database servers) which are interconnected through a high-speed wired network, and queries are issued by mobile units (laptop, cell phone, etc.) which access the data objects of database servers by wireless channels. The inherent properties of mobile computing environment such as mobility, limited wireless bandwidth, frequent disconnection, make skyline queries more complicat...     

The impact of laptop-free zones on student performance and attitudes in large lectures

The goal of this study was to determine if laptop use in lecture negatively impacts learning outcomes of surrounding students taking notes on paper. Two sections of a large introductory biology course (>400 students/section) were zoned into a laptop-permitted and a laptop-free area. Two sections in which laptop users could sit anywhere served as the Control. There was no difference in the attendance (∼85%) or percentage of students using laptops (∼29%) between Zoned and Control sections. Academic performance, based on exam points earned, was not significantly different for paper users in Zoned and Control sections indicating laptop use did not impair the overall achievement of surrounding students. However, there was a correlation between exam performance and note taking preference: paper note takers scored significantly higher and laptop users scored significantly lower than predicted by pre-class academic indicators (p < 0.01, paired t-test). The majority of both laptop (64%) and paper users (82%) in the Zoned sections supported a policy restricting laptop use to specific areas. Thus, while we further investigate whether the relationship between laptop use and performance is correlative or causative, zoning is an effective method for accommodating both laptop users and paper note takers in the same lecture hall.     

基于规模化无线网络技术架构解决方案的思考

随着宽带网络迅速普及,越来越多的人希望用手提电脑、PDA、手机等设备移动接入网络.而无线宽带网络逐渐在公共接入.公共安全.公共服务等方面发挥巨大潜力,引发了无线网络建设的热潮;本文在分析制约无线网络发展的主要问题基础上.对规模化无线网络建设给出一些具体方案和建议.     

具有负载均衡和蚁群优化的移动P2P路由策略

分析了移动P2P网络的移动节点设备资源更加短缺,网络更加动态多变,建立健壮的路由策略是非常重要的。通过研究移动P2P网络的特征,从路由发现、路由选择、路由保持三个方面入手,提出了一种新的具有负载均衡和蚁群优化的路由策略。利用蚁群算法理论来指导移动agent的全局搜索的路由发现工作,并且结合通用的能量消耗公式计算得到的节点剩余能量和节点业务执行等候队列长度来优化路由选择工作。从仿真实验可以看到,该路由策略在平均端到端的延迟、路由控制负载方面具有性能优势。同时,节约了节点的能量,延长了节点在网络中的生存时间。     

Stereo Viewing and Virtual Reality Technologies in Mobile Robot Teleguide

The use of 3-D stereoscopic visualization may provide a user with higher comprehension of remote environments in teleoperation when compared with 2-D viewing, in particular, a higher perception of environment depth characteristics, spatial localization, remote ambient layout, faster system learning, and decision performance. Works in the paper have demonstrated how stereo vision contributes to the improvement of the perception of some depth cues, often for abstract tasks, while it is hard to find works addressing stereoscopic visualization in mobile robot teleguide applications. This paper intends to contribute to this aspect by investigating the stereoscopic robot teleguide under different conditions, including typical navigation scenarios and the use of synthetic and real images. This paper also investigates how user performance may vary when employing different display technologies. Results from a set of test trials run on seven virtual reality systems, from laptop to large panorama and from head-mounted display to Cave automatic virtual environment (CAVE), emphasized few aspects that represent a base for further investigations as well as a guide when designing specific systems for telepresence.      

Ownership versus on-campus use of mobile IT devices by university students

This study investigated ownership and on-campus use of laptops, tablets, and smartphones, using survey information on Dutch university students. We show that 96% of students own at least one of these mobile IT devices (i.e., a laptop, tablet, or smartphone). Using econometric modelling, we also show that student income, parental income, gender, immigrant parents, and household type (e.g., living with parents) have a statistically significant but small effect on mobile IT device ownership. The demand for tablets is relatively income inelastic, and the demand for laptops and smartphones extremely so. Therefore ownership rates are high for all student groups, including lower income students. However, students leave their laptops (and tablets) at home most of the time, mainly because they find it cumbersome to carry a laptop, and the vast majority of students hold the opinion that abolishing computer labs while facilitating laptop use is a bad idea, despite the didactical advantages this may have during lectures. Thus, it appears that the current high ownership rates of mobile IT devices by no means imply students' preference or support for university Bring Your Own Device (BYOD) strategies.     

An affordable modular mobile robotic platform with fuzzy logic control and evolutionary artificial neural networks

Autonomous robotics projects encompass the rich nature of integrated systems that includes mechanical, electrical, and computational software components. The availability of smaller and cheaper hardware components has helped make possible a new dimension in operational autonomy. This paper describes a mobile robotic platform consisting of several integrated modules including a laptop computer that serves as the main control module, microcontroller‐based motion control module, a vision processing module, a sensor interface module, and a navigation module. The laptop computer module contains the main software development environment with a user interface to access and control all other modules. Programming language independence is achieved by using standard input/output computer interfaces including RS‐232 serial port, USB, networking, audio input and output, and parallel port devices. However, with the same hardware technology available to all, the distinguishing factor in most cases for intelligent systems becomes the software design. The software for autonomous robots must intelligently control the hardware so that it functions in unstructured, dynamic, and uncertain environments while maintaining an autonomous adaptability. This paper describes how we introduced fuzzy logic control to one robot platform in order to solve the 2003 Intelligent Ground Vehicle Competition (IGVC) Autonomous Challenge problem. This paper also describes the introduction of hybrid software design that utilizes Fuzzy Evolutionary Artificial Neural Network techniques. In this design, rather than using a control program that is directly coded, the robot's artificial neural net is first trained with a training data set using evolutionary optimization techniques to adjust weight values between neurons. The trained neural network with a weight average defuzzification method was able to make correct decisions to unseen vision patterns for the IGVC Autonomous Challenge. A comparison of the Lawrence Technological University robot designs and the design of the other competing schools shows that our platforms were the most affordable robot systems to use as tools for computer science and engineering education. © 2004 Wiley Periodicals, Inc.