Gait event detection algorithm based on smart insoles

Gait analysis is an effective clinical tool across a wide range of applications. Recently, inertial measurement units have been extensively utilized for gait analysis. Effective gait analyses require good estimates of heel‐strike and toe‐off events. Previous studies have focused on the effective device position and type of triaxis direction to detect gait events. This study proposes an effective heel‐strike and toe‐off detection algorithm using a smart insole with inertial measurement units. This method detects heel‐strike and toe‐off events through a time‐frequency analysis by limiting the range. To assess its performance, gait data for seven healthy male subjects during walking and running were acquired. The proposed heel‐strike and toe‐off detection algorithm yielded the largest error of 0.03 seconds for running toe‐off events, and an average of 0–0.01 seconds for other gait tests. Novel gait analyses could be conducted without suffering from space limitations because gait parameters such as the cadence, stance phase time, swing phase time, single‐support time, and double‐support time can all be estimated using the proposed heel‐strike and toe‐off detection algorithm.     

电气电子材料类课程的对比研究

美国麻省理工学院的两门开放课件"Electrical,Optical andMagnetic Materials and Devices"和"Electronic and Mechanical Properties of Materials"分别为大学生和研究生开设,它们与我院为大学本科生和研究生开设的"电气功能材料"...     

电子信息机房UPS供电方式的选择

文中介绍了常用的UPS系统供电方式,通过对各种UPS供电方式的系统效率、设备投资、容错性能、可用性、装机占地面积及承重的比较,为用户提供在不同类型的电子信息机房选择UPS系统的建议。     

基于单片机的便携式电子血压计设计

基于单片机的便携式电子血压计设计,成功的设计出了4K字节FLASH储存器的低电压、高性能的CMOS8位微型处理器为控制核心的随身携带式电子血压计,本文将着重阐述电子血压计测量的原理以及软硬件设计方法。该血压计利用进口压力传感器将采集回的血管压力转化为电子信号,将模拟信号转成具体的数字信号后转回单片机,然后再经过计算、存储、显示等处理。这种家庭性的电子血压计的设计可以让人们使用起来更加方便,不耽搁高贵的时间。另外此系统设计中使用的被动组建和芯片有着投入成本低、功耗低、小型化等优点,这符合当今社会不断向前发展的前景。     

电子电路故障检测技术探索

本文深入探究电子电路障碍检测技术出现故障的原因,对电子电路故障的检测技术实施具体分析。     

探索电工电子课程多元化的过程性考核方式

考试是高校实现人才培养目标的落脚点,探索基于实践项目制作、基于信息化手段、基于非标考题等多元化的过程性考核方式改革,加大过程性考核的分值比重,增加过程性考核方式的趣味性和创新性,优化电类课程考核模式,进而达到全面提升电工电子课程的高阶性、创新性和挑战度的终极目标。     

DETERMINATION OF CADMIUM,COBALT, COPPER,LEAD AND ZINC IN BEER BY FLAME ATOMIC ABSORPTION SPECTROSCOPY

A method has been developed for the simultaneous determination of Cd, Co, Cu, Pb and Zn in beer at the levels found in this beverage. A previous ashing of organic matter and a subsequent liquid-liquid extraction with ammonium pyrrolidine dithiocarbamate/4 methyl-2-pentanone were carried out. The final determination was performed using flame atomic absorption spectroscopy The sensitivity [units of absorbance × (ng./g.)^?1], detection limit (ng./g.), precision (coefficient of variation) and recovery percentage were: Cd (133 × 10^?3, 0.005, 14%, 98±15), Co (127 × 10^?3, 0.02, 4%, 90±7), Cu (5.63 × 10^?3, 0.2, 11%, 103±6), Pb (15.8 × 10^?3, 0.1, 12%. 88±11), Zn (21.6 × 10^?3, 2, 6% 115±7). Different brands of beer from Spain and other European countries were analysed by this method. Metal contents of Spanish beers do not differ significantly from those found in foreign beers and all are well below the maximum levels permitted in international legislation. No differences were found between bottled and canned beers and no correlation exists between metal contents and original gravity of the beers. The method proposed is also applicable to the determination of all the elements mentioned above in lemonade and for Co, Cu and Pb in Spanish sparkling white wine (“cava”).     

激波诱导火焰变形的二维数值模拟

利用改进的Van Leer格式,通过求解带化学反应的Euler方程,对甲烷/空气混合物中激波诱导火焰变形的过程进行了数值模拟,使用了甲烷/空气详细化学反应机理及其热力学和动力学数据.根据计算结果,讨论了激波掠过火焰时的变形过程,以及激波作用下火焰中组分的浓度和净反应生产速率的变化关系.结果表明,火焰在激波作用下可分叉形成λ波,并进一步发展为球形激波,最终被压缩弯曲,而燃烧的化学反应过程发生在火焰与未燃物质的环形交界面上.     

Parameters estimation and detection of MIMO-LFM signals using MWHT

This article proposed an improved Wigner–Hough Transform (WHT) for multicarrier LFM signals of MIMO radars (MIMO-LFM). First, the signal model of the intercepted MIMO-LFM signals and the localisation of conventional WHT for this signal model are analysed. Therefore, we present the new WHT with multiple matching components, which is called as multicomponent WHT (MWHT). Then the detection and parameters estimation performance of MWHT are deduced, and analytical results indicate that MWHT is superior to conventional WHT for MIMO-LFM. In order to reduce the computation cost, a coarse estimation method is introduced. Finally, the numerical simulations demonstrate the validity of MWHT, as well as analytical results.