Older adults’ use of smart phones: an investigation of the factors influencing the acceptance of new functions

After adopting mobile phones, most older adults use them only for calling and SMS. The purpose of this study is to extend their usage of mobile phones to new functions. To understand older adults’ requirements of mobile phones, a questionnaire was constructed and 351 Chinese older adults were recruited to complete the questionnaires. Data collected through the questionnaires were analysed using explorative factor analysis. The results revealed that older adults’ requirements were composed of 10 factors: Find a Specific Function, Awareness and Attractiveness, Readability, Personal Concern, Soft Keys and Multi-tap, Hardware Capacity, Touch Screen, Concern of Learning, Connectivity, and Social Influence. Then, from the above 10 factors, the 6 most important factors were revealed using multiple linear regression analysis. The results imply that accepting new functions is different from accepting a product. Readability and Find a Specific Function, which are critical for older adults’ acceptance of feature phones, are not determinants of their acceptance of new functions in smart phones.     

国内外聚氯乙烯塑料门窗的现状及展望

介绍了未增塑聚氯乙烯塑料门窗的导热系数低、防水、防潮等特点,利用PVC型材作门窗是节约建筑材料的一条重要途径.重点阐述了国内外聚氯乙烯塑料门窗的生产、使用情况及国内产品存在的缺陷,另外还论述了国内塑料门窗的发展趋势,对PVC塑料门窗在国内的发展应用有促进作用.     

SVD‐Based Accurate Identification and Compensation of the Coupling Hysteresis and Creep Dynamics in Piezoelectric Actuators

In this paper, the coupling hysteresis and creep in piezoelectric actuators are identified and compensated for accurate tracking. First, we present the coupling hysteresis and creep model in smart actuators. Next, a complete identification strategy is designed according to the properties of the Preisach model. Then, an approach for parameter updating of the coupling model is provided. With the identified hysteresis and creep, the model‐based inversion compensation is designed. Finally, we apply the model identification and compensation to a piezoelectric stage to demonstrate the effectiveness of the proposed approaches. Significant reduction of the tracking error is achieved with the model‐based inversion feedforward compensator in which the relative errors at 10 Hz and 50 Hz are reduced to 1.85% and 4.53%, respectively. In addition, the model‐based feedforward is augmented with an integral feedback controller. With the composite controller, the relative errors at 10 Hz and 50 Hz are reduced to 0.42% and 3.04%, respectively.     

智能站二次设备的运行分析

比较了智能变电站与常规站的管理和结构特点,深入研究了二者的差异以及智能变电站二次设备运行的调试、维护等相关问题,并且提出了几点建议,以期对实际工作起到一定的指导作用。     

农村智能电表推广应用研究

随着我国经济社会的快速发展,建设坚强智能电网的步伐也越来越快。智能电表作为智能电网的最末端,已开始在农村推广应用。通过分析目前农村智能电表推广应用中存在的问题,提出了在农村智能电表全面推广中应解决的问题和应对措施。     

基于zigbee的智能家居系统的设计与实现

物联网技术作为一项新兴的技术,已经成为了研究人员研究的热点。智能家居作为物联网的一个重要的分支,几年来发展迅猛,为人们提供了理想的家居环境。人们追求更加理想的生活环境,为了满足人们的追求,我们设计了一款基于zigbee技术的智能化窗帘。该系统是基于zigbee技术的的一款可以无线通信的智能化窗帘。采用的是TI公司的cc2530的zigbee片上应用系统。通过无线传输技术、传感技术等实现窗帘的智能控制。     

基于Android的移动课件研究与设计

对移动学习的相关理论知识与技术方法进行了研究,以算法与数据结构课程为例,采用服务器结合客户端的模式设计了基于Android的移动课件。该课件在Android手机上顺利通过了测试,并且在计算机专业学生中应用,取得了良好的教学效果。     

基于日志的客户感知问题辅助分析系统的应用研究

智能手机的移动业务和移动互联网应用直接影响客户感知,通过挖掘网络日志与手机日志对客户感知问题分析的支撑作用,提出基于日志的客户感知问题辅助分析系统。该系统通过采集、分类和统计,提供异常事件告警和智能分析。通过对上网和彩倩业务的应用实践表明,该系统能提供准确、有效的日志信息,为分析和定位问题提供端到端的数据支持。该系统和思路可扩展应用于长期演进网络的客户感知问题辅助分析。     

碳纤维水泥石电阻测试方法研究

准确测量碳纤维水泥石的电阻率是碳纤维水泥石的压敏和温敏性能得以应用的关键问题之一。已有研究表明，电阻率测量结果准确性受电极的制作形式及电阻的测试方法影响较大。本文在试验的基础上，分析了几种适用于碳纤维水泥石的电极布置形式的特点及两极法和四极法对电阻测试结果的影响。研究表明，碳纤维水泥石电阻宜采用插入式四极法测量。     

基于蓝牙通信的高校课堂手机考勤管理系统磁

论文设计并实现了一种基于蓝牙通信的低成本高效智能学生考勤和信息管理系统。充分利用蓝牙短距离传输和穿墙能力差的特性,有效实现了对教室内通讯信号的短距离控制,并且结合现有校园 Wi-Fi 覆盖条件和智能化手机等优势技术实现了实时、快速、高效的考勤信息采集和考勤信息管理与实时展示。实验结果表明,该系统较人工考勤方式在可信度和速度上具有明显优势,也可以成为目前高校智慧校园管理中的重要组成部分。