Imperfect premise matching based fuzzy control with passive constraints for discrete time-delay multiplicative noised stochastic nonlinear systems

This paper investigates a fuzzy controller design method for discrete-time nonlinear stochastic time-delay systems which are presented by the Takagi-Sugeno (T-S) fuzzy model with multiplicative noises. Utilizing the proposed design method, the fuzzy controller can be carried out via not only state feedback scheme but also output feedback scheme. Both of them are accomplished by the concept of imperfect premise matching (IPM). For discussing the stabilization problem, the Lyapunov-Krasovskii function and passivity theory are applied to derive the sufficient conditions. Moreover, the discrete Jensen inequality is employed to decrease the conservatism of the proposed method. Finally, a numerical example for the control of a nonlinear time-delay pendulum system is provided to show the effectiveness and usefulness of the proposed design method.     

Parameter-dependent robust H ∞ filter design for uncertain discrete-time systems with quantized measurements

This paper deals with the problem of parameter-dependent robust H _∞ filter design for uncertain discrete-time systems with output quantization. The uncertain parameters are supposed to reside in a polytope. The system outputs are quantized by a memoryless logarithmic quantizer before being transmitted to a filter. Attention is focused on the design of a robust H _∞ filter to mitigate quantization effects and ensure a prescribed H _∞ noise attenuation level. Via introducing some slack variables and using the parameter-dependent Lyapunov function, sufficient conditions for the existence of a robust H _∞ filter are expressed in terms of linear matrix inequalities (LMIs). Finally, a numerical example is provided to demonstrate the effectiveness of the proposed approach.     

A kinect-based vocational task prompting system for individuals with cognitive impairments

Difficulties in executing daily living tasks hamper the quality of life of many individuals with cognitive impairments who are otherwise physically mobile. With sufficient and appropriate support on the job, many people with developmental disabilities and cognitive impairments are capable of participating in the world of work to various levels. Kinect is used as assistive technology for individuals with cognitive impairments to achieve the goal of performing task steps independently. In a community-based rehabilitation program under the guidance of three job coaches, a task prompting system called Kinempt was designed to assist four participants involving pre-service food preparation training. The study assessed the effectiveness of Kinempt in terms of precision and recall. A follow-up comparative study then evaluated a baseline method and the system of least prompts against the Kinempt system. Results indicate that for participants with cognitive disabilities, acquisition of job skills may be facilitated by use of Kinempt in conjunction with operant conditioning strategies. Our findings suggest that the image recognition technology may be able to facilitate task prompts needed by people with cognitive impairments. Therefore, the system may be helpful for pre-service training while increasing independence in the process of community integration.     

基于Modbus总线的接口模块扩展①

提出一种基于Modbus总线和STC5410AD单片机的接口扩展方法,适合用于需要大量扩展接口的场合,将使系统的设计灵活,高效。介绍了具体硬件的实现方法和Modbus从节点通信程序设计方法。     

应用批处理实现学校机房高效管理

批处理命令简洁而高效,在许多不便安装硬件还原卡的学校机房,系统维护工作比较繁琐,应用批处理命令实现了开机自动系统优化,以及网络克隆后自动修改机器配置,为学校机房管理提供了一条比较实用方便的维护管理方法。     

基于VxWorks操作系统的PCI设备驱动程序开发

VxWorks是WindRiver公司开发的嵌入式实时操作系统,广泛地应用于航空航天、工业控制、通信等领域;分析了VxWorks下PCI设备驱动程序的实现方法;以PCI9054图像采集卡的驱动程序开发为例,介绍了PCI总线设备的配置空间结构及配置空间的访问方法,重点说明了在VxWorks下PCI设备驱动程序的开发步骤及编程要点,并给出了部分关键代码;在某视频图像采集系统中的运行结果表明该PCI设备驱动程序运行稳定、可靠。     

组合预测模型在电力系统负荷预测中的应用研究

本文基于灰色预测模型、滑动平均模型和指数平滑模型这三种单一预测模型,采用方差-协方差策略,建立组合预测模型。然后结合老挝电力系统的概况,对老挝的全国年用电量进行预测和分析。结果表明,组合预测模型的预测精度明显高于各单一预测模型,即组合预测模型的相对误差小于各单一预测模型的相对误差,说明组合预测模型具有相当的适用性和优越性。     

流媒体应用中关键技术的研究探析

本文从流媒体应用支持该的流媒体编码技术和网络技术两个角度出发,针对其面临的挑战,深入、全面的综述了编码技术与网络技术的发展与现状,并指出了大规模流媒体应用中关键技术的研究方向.     

基于Web的气象计量检定收发管理系统

从气象计量检定的实际情况出发,经过对客户进行仪器收发操作流程的一番考察和分析,建立一个基于工作流程的气象计量检定客户管理系统.从客户送检仪器的登记、取样仪器的登记和仪器检定情况的查询等方面对系统的结构和功能设计进行阐述.     

无人机编队队形保持变换控制器设计

研究无人机编队队形保持变换的控制设计问题.由于控制系统队形跟踪应保证姿态的稳定性,针对两架无人机在“长机-僚机”编队结构中的左菱形编队飞行控制系统,为了有效控制飞行队形,保持变换,提出了根据编队飞行的几何关系推导编队相对运动学方程,结合无人机的自动驾驶仪模型建立了相应的编队飞行线性化数学模型.采用PID控制方法分别对速度、航向和高度设计了一种能通过控制编队间距实现队形变换的三维编队队形保持变换的控制器,并进行仿真.仿真结果表明所设计的控制器能够有效地控制无人机编队,在飞行过程中可以稳定地保持队形,并能根据任务要求合理进行编队,并无碰撞,为设计提供了依据.