可重构系统在线任务预约重调度算法

针对可重构系统的任务调度问题,提出一种基于最小裕度优先策略的在线任务预约重调度算法。该算法在任务预约的基础上,对预约失败的任务和已预约的任务按特定优先策略进行重调度。仿真实验结果显示,在正常负载率区间中,该算法有效降低了任务拒绝率,且运行开销较小。     

基于信息势能的鲁棒估计器及其在同时定位与地图构建问题中的应用

提出了一种基于信息势能鲁棒估计器来解决机器人室内的同时定位与地图构建（SLAM）问题．结构化的室内环境可以用线段近似表示．然而动态环境中,测距传感器测得的数据通常湮没在大量的噪声信号中．本文采用“分割与合并”（split—and．merge）方法进行线段的分类,根据信息势能的性能指标衡量每个采样数据对该线段的信息贡献量．按照信息优化理论设计估计器,选择信息量贡献大的样本点作为信息内点提取线段参数,构建局部地图．采用粒子滤波器进行地图及机器人路径的更新．采用递推的方法估计信息势能,降低了对样本点的信息量贡献做估计时的复杂度．仿真和实验结果证明,本文所提出的方法具有较强的鲁棒性,提高了SLAM策略的准确性和实时性．     

一种新型电力系统在线防误闭锁装置

电气误操作是威胁电力系统安全运行的责任事故,可能造成大面积停电、电气设备毁坏、系统振荡瓦解,甚至造成人身伤亡.现有的防误闭锁装置不能实现电气操作的在线防误闭锁,以及变电站之间操作的防误闭锁.基于这种情况提出了一种将RFID数字操作票和在线防误闭锁控制器相结合的新型电力系统在线防误闭锁装置,该装置能对电力系统操作起到很好...     

基于以太网的交流接触器在线监测系统设计

针对工业远距离测控环境,设计了基于以太网的交流接触器在线监测系统,实现了交流接触器的运行状态实时监控,达到了状态检修的目的,解决了传统交流接触器只能实现定期检修和事故检修的问题.设计了一种基于C8051F040型单片机和以太网芯片ENC28J60实现的测控系统,详细介绍了系统的工作原理,重点阐述了通信系统软硬件设计方法.实验结果表明,该系统能够实现远距离的交流接触器状态实时监控.     

直升机发动机滑油中金属屑在线处置系统设计

滑油中金属屑监控和在线处置已成为保障国内外新一代发动机健康运转的主要技术手段.通过脉冲电流技术,研制一种储能装置和烧蚀装置,实现直升机发动机滑油中正常磨损金属屑在线处置能力.通过直升机飞行中控制程序,减少金属屑虚警率,确保发动机健康高效地运转.填补了国内直升机发动机滑油中金属屑在线处置技术的空白.     

Design of an adaptive fuzzy sliding mode control for uncertain discrete-time nonlinear systems based on noisy measurements

This paper presents the design of an adaptive fuzzy sliding mode control (AFSMC) for uncertain discrete-time nonlinear dynamic systems. The dynamic systems are described by a discrete-time state equation with nonlinear uncertainties, and the uncertainties include the modelling errors and the external disturbances to be unknown but nonlinear with the bounded properties. The states are measured by the restriction of measurement sensors and the contamination with independent measurement noises. The nonlinear uncertainties are approximated by using the fuzzy IF-THEN rules based on the universal approximation theorem, and the approximation error is compensated by adding an adaptive complementary term to the proposed AFSMC. The fuzzy inference approach based on the extended single input rule modules is proposed to reduce the number of the fuzzy IF-THEN rules. The estimates for the un-measurable states and the adjustable parameters are obtained by using the weighted least squares estimator and its simplified one. It is proved that under some conditions the estimation errors will remain in the vicinity of zero as time increases, and the states are ultimately bounded subject to the proposed AFSMC. The effectiveness of the proposed method is indicated through the simulation experiment of a simple numerical system.     

在线超声波流量监测系统设计及其应用

为解决地源热泵系统中的进出水流量测量,设计研究基于超声波时差法原理的非接触式在线流量监测装置。系统以STM32F407 ZE为主控制器,定时采集流量、完成数据封包、加密和远端服务器交互任务;以MSP430F2618为流量测量控制器,采用时差法以TDC-GP22精准测量超声波在介质中传播时间,实现管道流体流速、流量实时监测。系统测试结果实现流量数据测量及上传存储到远端服务器,满足地源热泵系统流量监测需求。     

增强式网络考试系统设计

网络考试系统是当前计算机应用的热门研究课题之一．从单一学科、简单题型、随机算法组卷的简单网络考试系统逐渐向多学科,多题型,智能组卷的增强式网络考试系统发展．通过对目标系统进行需求分析,了解其功能需求,设计一个完善的增强式网络考试系统,为最终实现该类型考试系统打下基础．     

An extension of an over-dispersion test for count data

While over-dispersion in capture-recapture studies is well known to lead to poor estimation of population size, current diagnostic tools to detect the presence of heterogeneity have not been specifically developed for capture-recapture studies. To address this, a simple and efficient method of testing for over-dispersion in zero-truncated count data is developed and evaluated. The proposed method generalizes an over-dispersion test previously suggested for un-truncated count data and may also be used for testing residual over-dispersion in zero-inflation data. Simulations suggest that the asymptotic distribution of the test statistic is standard normal and that this approximation is also reasonable for small sample sizes. The method is also shown to be more efficient than an existing test for over-dispersion adapted for the capture-recapture setting. Studies with zero-truncated and zero-inflated count data are used to illustrate the test procedures.     

Patterns for multigrid equidistributed functions: Application to general parabolas and length estimation

We show that for some special functions (called k-multigrid equidistributed functions), we can compute the limit of the frequency of patterns in the discretization of their graph, when the resolution tends to zero. This result is applied to parabolas. We deduce also that local length estimators almost never converge to the length for the parabolas.