改进的惯性运动传感器步态识别

针对现有步态识别研究中步态识别率低、算法单一等问题,提出了一种基于惯性运动传感器的步态识别方法。首先,该方法结合动态时间规整与人工神经网络,通过前者提取固定长度的步态特征,并设置成本函数的阈值来判别后者的正负输入,提取得到波形特征。其次,运用列文伯格-马夸尔特算法改进标准BP神经网络,最终完成步态识别。实验证明所提的改进步态识别方法将平均步态识别率和相等错误率维持在91.5%和9.1%,较好地提高了步态识别的准确率。因此,该方法可作为高级认证方法的补充,以增加个人信息的隐私和安全性,适合实验室仪器安全管理应用。     

轮式微型机器人运动机理与步态规划

在一种新型形状记忆合金驱动器的基础上,研制了一种微型蠕动机器人,该机器人采用轮式移动机构.对形状记忆合金驱动器、轮式移动机构的结构和运动机理以及机器人的步距扩大原理进行了讨论.并在此基础上,对机器人的直线运动步态和转弯步态进行了规划,使机器人在偏心轮自锁机构和换向机构作用下,不但可以前后运动,还具有主动转弯能力,在一定程度上克服了传统的形状记忆合金机器人移动速度慢、只能被动转弯的缺点.最后对形状记忆合金驱动器所需加热电流及该机器人的运动性能进行了试验分析.     

基于PLS特征筛选和改进结构PNN的步态识别

采集单侧大腿截肢患者髋关节有代表性的加速度信号(双轴)和角速度信号,并同时采集足底压力信号,进行多运动模式识别,经信号预处理提取出特征参数,利用偏最小二乘法(PLS)进行特征筛选,最后利用改进的概率神经网络(PNN)步态模式识别和分类,实现对下肢假肢在行走、上下坡、上下台阶的不同运动模式的有效识别。     

步态识别算法研究及FPGA实现

步态识别是一种根据人行走方式的不同来进行身份识别的生物特征识别技术。本文构建了一个FPGA控制的步态识别系统,实现了对人的自动、准确、实时的识别。系统的功能为：在简单背景下,从视频序列中分离运动目标,计算其特征值,并与步态数据库数据进行逐一比对,进行鉴别。采用构建的系统对中科院自动化研究所的步态数据进行识别,达到了90％的识别率。     

人体步态特征生物识别方法研究

人体行走步态特征是一类重要的生物特征,基于步态特征实现生物识别的方法具有较多优势.在分析人体行走步态特征的基础上,讨论了当前步态识别研究中采用的视频获取、目标提取、步态特征检测以及分类识别的主要技术,研究了基于雷达的步态信号提取方法并给出了实验步态信号时频分析结果;分析了当前研究中存在的主要难点.提出了基于视频、雷达等多传感器数据融合提高步态识别能力的方法,讨论了步态识别的应用领域和前景.     

自适应式平衡调整模块探讨

模块在机构上继承了在静态步态中使用的结构,并在此基础上加入了一套独立设计的平衡调整模块,设计了自适应式动态步态模块,对模块的进行了探讨,对步行机器人实现仿人的步行方式具有意义。     

Novel Walking Stability-Based Gait Recognition Method for Functional Electrical Stimulation System Control

Gait recognition is the key question of functional electrical stimulation (FES) system control for paraplegic walking. A new risk-tendency-graph (RTG) method was proposed to recognize the stability information in FES-assisted walking gait. The main instrument was a specialized walker dynamometer system based on a multi-channel strain-gauge bridge network fixed on the walker frame. During walking process, this system collected the reaction forces between patient's upper extremities and walker and converted them into RTG morphologic curves of dynamic gait stability in temporal and spatial domains. To demonstrate the potential usefulness of RTG, preliminary clinical trials were done with paraplegic patients. The gait stability levels of two walking cases with 4- and 12-week FES training from one subject were quantified (0.43 and 0.19) from the results of temporal and spatial RTG. Relevant instable phases in gait cycle and dangerous inclinations of patient's body during walking process were also brought forward. In conclusion, the new RTG method is practical for distinguishing more useful gait stability information for FES system control.     

人体下肢膝-踝关节智能仿生控制装置设计

为使人体下肢假肢尽可能接近正常人的步态行走模式,设计了以数字信号处理器（DSP）为控制核心的下肢假肢膝-踝关节柔性仿生控制装置,以便改善下肢假肢的功能性、灵活性与可用性;设计采用生物电传感器采集患者下肢残段的生物电信号,同时检测速度及加速度传感器的信息,经多通道信号运算放大滤波后,进行模数转换,将数字信息输入DSP微处理器进行步态分析与决策,DSP输出的PWM信号对电机进行控制,进而控制假肢的膝-踝关节的全时相角度、力学及运动学参数。     

The kinematics and force analysis of a new leg mechanism for multi-legged wall-climbing robot

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形态学参数对100米比赛成绩的影响

为了探讨形态学参数(身高、体重、罗勒指数、克托莱指数、BMI)对运动员100 m比赛成绩的影响,根据平均成绩(10.87 s),将女子100 m历史上突破11秒的71名运动员分为2组:FG(Faster Group)和SG(SlowerGroup),分析其形态学参数对比赛成绩的影响.结果表明,女子100 m运动员的身高、体重、罗勒指数、克托莱指数、BMI与比赛成绩不存在显著性相关(P>0.05);FG与SG在形态学参数上不存在显著性差异(P>0.05);形态学参数对100 m比赛成绩的影响不存在性别差异,步态参数对100 m比赛成绩的影响存在性别差异.     

多吸盘爬壁机构的承载能力和倾复趋势研究

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Quasi 1D modeling of two-phase flow and deposit formation for urea-selective catalytic reduction systems

A quasi 1D model of two-phase flow for a urea-selective catalytic reduction (SCR) system is developed which can calculate not only the generation of reducing agent but also the formation of deposits in the exhaust pipe. The gas phase flow is solved through Euler method, variables are stored on staggered grids, and the semi-implicit method for pressure-linked equation (SIMPLE) algorithm is applied to decouple the pressure and velocity. The liquid phase is treated in a Lagrangian way, which solves the equations of droplet motion, evaporation, thermolysis, and spray wall interaction. A combination of a direct decomposition model and a kinetic model is implemented to describe the different decomposition behaviors of urea in the droplet phase and wall film, respectively. A new 1D wall film model is proposed, and the equations of wall film motion, evaporation, thermolysis, and species transport are solved. The position, weight, and components of deposits can be simulated following implementation of the semi-detailed kinetic model. The simulation results show that a decrease in the exhaust temperature will increase the wall film region and the weight of deposits. Deposit components are highly dependent on temperature. The urea-water-solution (UWS) injection rate can affect the total mass of wall film and expand the film region, but it has little influence on deposit components. An increase in exhaust mass flow can decrease the total weight of deposits on the pipe wall because of the promotion of the mass and heat transfer process both in the droplets and wall film.     

振动法测气体比热容比实验方法的改进

指出传统振动法测气体比热容比实验的不足之处。设计了一种新的实验方法,通过改变气流方式以降低振动小球与管壁的碰撞机率,控制振动小球的振幅使之更接近简谐振动.并利用原有的光电计数仪,调整计数次数.测量显示,实验值更接近双原子的比热容比值。     

Velocity distribution and scaling properties of wall bounded flow

The scaling and similarity of wall bounded turbulent flow were studied. The properties of such flows and the relationship between a power law and a logarithmic type of velocity distribution were investigated. Based on the physical mechanism involved, our results show that the power law and the logarithmic distribution are only different forms with the same hypothesis and hold only in the outer flow zone. Thus, a universal explanation for various empirical formulae of velocity distribution was obtained. Manning＇s formula was studied to explain theoretically the experiential result that the roughness coefficient is only a comprehensive parameter of the whole system without a corresponding physical factor. The physical mechanism of the velocity distribution of parallel to wall bounded flow was explored, the results show that the parameters in the formula of velocity distribution are indices of the system responding to flowing environmental factors to represent general case of boundary roughness and the flowing state, corresponding physical mechanism is vortex motion.     

单心动周期三维超声评价心梗后的左心收缩功能及同步性

目的应用单心动周期三维超声评价心肌梗塞患者的左心收缩功能及同步性,以便方便、快捷、准确地识别心肌梗塞的节段。方法正常组30例,心梗组27例,先用二维Simpson’S法测定左室整体EF值,再用单心动周期三维超声测左室整体EF值、SDll7值、DDI17值及各节段的容积时间曲线、EF值曲线。比较各组间参数的差异及相关性。结果正常组2D法和4D法测得的左室射血分数无明显差异。心梗组2D法和4D法测得的左室射血分数差异显著。正常组和心梗组的SD117值差异显著,DDI17值在两组间无明显差异。结论单心动周期三维超声心动图能全面真实地显示左室的几何形态,本研究显示心梗后左室整体EF值下降,17节段容积一时间曲线同步性差,曲线图直观明了,可以方便、快捷、准确地识别心肌梗塞的节段。     

The development of gait: a study in African children ages one to five

The purpose of this study was to describe quantitatively the gait development of a group of African children to determine how the pattern changes would relate to growth and maturation. This work applies an established technology of gait analysis to field conditions. 65 children of the Gusii tribe from southwestern Kenya were selected for study with an age range from 13 months to 69 months. Gait evaluation was performed by film recording free-cadence walking of the children. Growth in stature and age both influence the gait patterns. Developmental patterns of alteration in velocity, stride length, and cadence quantitatively measured in this study closely parallel observations made on children in laboratory settings by other workers.     

Motion texture using symmetric property and graphcut algorithm

INTRODUCTIONRecent advances in motion capture techniques and other motion editing software facilitate character animation with unprecedented ease and realism. It is still an important and active research area to synthe- size the realistic character animation with the motion capture data. Due to the restriction in recorded motion capture data, the direct reuse of long motion capture data is unacceptable, and thus a novel method to edit them is needed. In response, motion textures (Li et al…     

The motion of a charged particle in a magnetic field produced by a column current

To determine the motion of a charged particle in a magnetic field produced by a current flowing along a long column conductor, the equation of the motion was established on the basis of Lorentz force. Qualitative analysis and quantitative solutions demonstrated that the motion contains nonlinear oscillation. The oscillation can be treated as the perturbation of the helical motion, Which the particle undergoes in a special condition. The general motion is superposition of two helixes, one as an axis spiraled by another. It is proven that the oscillation is stable.     

当前100m跑运动员的速度特征研究述评

通过文献资料法对当前的100 m跑运动员的速度特征研究述评,研究发现在速度特征的研究领域中存在相当多的问题,至少在以下几个方面还需要进一步的研究：100 m跑运动员加速跑距离和成绩的关系研究;对优秀运动员的运动学数据的采集与研究结果的一致性需要考证;优秀运动员的速度特征对一般训练的启示是什么;速度特征的规范性研究、结论的可比性.