Cyclostationary Modeling of Surface Electromyography Signal During Gait Cycles and Its Application for Cerebral Palsy Diagnosis

Cerebral palsy (CP) is a group of permanent movement disorders that appear in early childhood. The electromyography (EMG) signal analysis and the gait analysis are two most commonly used methods in the clinic. In this paper, a cyclostationary model of the EMG signal is proposed. The model can combine the aforementioned two methods. The EMG signal acquired during the gait cycles is assumed to be cyclostationary due to the physiological characteristics of the EMG signal production. Then, the spectral correlation density is used to analyze the cyclic frequency (corresponding to the gait cycles) and spectral frequency (the frequency of EMG signal) in a waterfall representation of the two kinds of frequencies. The experiments show that the asymptomatic (normal) subjects and symptomatic subjects (with CP) can be distinguished from the spectral correlation density in a range of cyclic frequencies.     

基于J2EE架构的构件化集成

随着信息系统规模的不断扩大,软件变得更加复杂,系统面临可维护性降低、开发和调试周期长和重复开发的现象,如何降低系统的复杂性、开发和调试周期,提高软件的重用能力和系统的可维护性对信息系统至关重要。     

中国股票指数期货市场的创建分析与对策

一直以来,在中国股票市场上和期货市场上讨论的一个共同的热点话题就是股票指数期货。本文从股指期货问题的背景提出,分析了我国发展股指期货的道路和方向,并且借鉴了发达市场的经验,最后总结了股指期货对于我国资本市场的意义。     

有限元法在齿轮试验机模态测试中的应用

齿轮箱体上测量点和激励点的选取对整个箱体的模态测试和振动监测具有重要的影响。为了合理选取传感器安装位置和激励位置,在齿轮试验机模态测试中预先应用有限元法进行模态分析,然后根据分析结果布置测量点和激励点。实验表明采用该方法可以提高测量的信噪比,有利于提高测量精度。     

轮式工程机械操作模拟训练器关键技术研究

平衡重式叉车、空箱堆高机、集装箱正面吊是港口装卸作业的重要轮式工程机械,造价昂贵,操作复杂,安全性要求高.文中分析了平衡重式叉车、空箱堆高机、正面吊等工程机械的功能及驾驶操作要求,给出了模拟训练器的功能和结构,设计了操作训练时的虚拟场景,开发了模拟系统的软、硬件,完成了轮式工程机械操作模拟训练器关键技术的研究.