The determination of an accurate center of rotation of rocket motor nozzle or other object to be measured is of great interest across a wide range of applications,such as rocket,missile,robotics,industry,spaceflight,a...The determination of an accurate center of rotation of rocket motor nozzle or other object to be measured is of great interest across a wide range of applications,such as rocket,missile,robotics,industry,spaceflight,aviation and human motion analysis fields,particularly for clinical gait analysis.A new approach was proposed to estimate the moving objects' instantaneous center of rotation and other motion parameters.The new method assumes that the two segment of object to be measured are rigid body which rotates around a center of rotation between each other relatively.The center of rotation varies with time in the global coordinate system but is fixed in the local coordinate system attached to each segment.The models of rocket motor nozzle and its movement were established.The arbitrary moving object's corresponding to motion equations were deduced,and the least square closed-form solutions of the object's motion parameters were figured out.It is assumed that the two high speed CCD cameras mounted on the 750 nm infrared(IR) filter are synchronized and calibrated in advance.The virtual simulation experiment using 3D coordinates of markers was conducted by synchronized stereo image sequences based on 6-DOF motion platform and the experimental results prove the feasibility of our algorithm.The test results show that the precision of x,y,z component on center of rotation is up to 0.14 mm,0.13 mm,0.15 mm.展开更多
目的:观察减重蹲起训练对脑卒中伴膝过伸患者下肢运动功能的影响。方法:将76例脑卒中伴膝过伸患者按照随机数字表分入Remo组和对照组各38例,均进行常规治疗,Remo组使用智能化下肢综合评估训练系统,利用“稳定性、对称性反馈控制”技术...目的:观察减重蹲起训练对脑卒中伴膝过伸患者下肢运动功能的影响。方法:将76例脑卒中伴膝过伸患者按照随机数字表分入Remo组和对照组各38例,均进行常规治疗,Remo组使用智能化下肢综合评估训练系统,利用“稳定性、对称性反馈控制”技术对患者下肢进行减重状态下的助动蹲起训练;对照组使用配有矫正镜的肋木,在辅助下完成常规蹲起训练;每天1次,每周5次,共3周。采用Loudon评分评价膝过伸状况、简式Fugl-Meyer评分法(FMA)评价下肢运动功能、Berg平衡量表(Berg balance scale,BBS)评定平衡功能、良好重心分布评分(95%)、站起-走计时测试(time up and go test,TUGT)等参数进行结局指标评价。结果:干预前,两组患者膝过伸Loudon、FMA、BBS、TUGT、良好重心分布评分差异均无统计学意义(P>0.05)。干预3周后,两组患者在膝过伸Loudon、FMA、BBS、TUGT、良好重心分布评分均较治疗前显著提高(P<0.05),其中BBS、TUGT、良好重心分布评分Remo组较对照组有显著提高(P<0.05)。结论:减重蹲起训练可有效改善脑卒中膝过伸患者下肢运动功能。展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No. 50275040)
文摘The determination of an accurate center of rotation of rocket motor nozzle or other object to be measured is of great interest across a wide range of applications,such as rocket,missile,robotics,industry,spaceflight,aviation and human motion analysis fields,particularly for clinical gait analysis.A new approach was proposed to estimate the moving objects' instantaneous center of rotation and other motion parameters.The new method assumes that the two segment of object to be measured are rigid body which rotates around a center of rotation between each other relatively.The center of rotation varies with time in the global coordinate system but is fixed in the local coordinate system attached to each segment.The models of rocket motor nozzle and its movement were established.The arbitrary moving object's corresponding to motion equations were deduced,and the least square closed-form solutions of the object's motion parameters were figured out.It is assumed that the two high speed CCD cameras mounted on the 750 nm infrared(IR) filter are synchronized and calibrated in advance.The virtual simulation experiment using 3D coordinates of markers was conducted by synchronized stereo image sequences based on 6-DOF motion platform and the experimental results prove the feasibility of our algorithm.The test results show that the precision of x,y,z component on center of rotation is up to 0.14 mm,0.13 mm,0.15 mm.
文摘目的:观察减重蹲起训练对脑卒中伴膝过伸患者下肢运动功能的影响。方法:将76例脑卒中伴膝过伸患者按照随机数字表分入Remo组和对照组各38例,均进行常规治疗,Remo组使用智能化下肢综合评估训练系统,利用“稳定性、对称性反馈控制”技术对患者下肢进行减重状态下的助动蹲起训练;对照组使用配有矫正镜的肋木,在辅助下完成常规蹲起训练;每天1次,每周5次,共3周。采用Loudon评分评价膝过伸状况、简式Fugl-Meyer评分法(FMA)评价下肢运动功能、Berg平衡量表(Berg balance scale,BBS)评定平衡功能、良好重心分布评分(95%)、站起-走计时测试(time up and go test,TUGT)等参数进行结局指标评价。结果:干预前,两组患者膝过伸Loudon、FMA、BBS、TUGT、良好重心分布评分差异均无统计学意义(P>0.05)。干预3周后,两组患者在膝过伸Loudon、FMA、BBS、TUGT、良好重心分布评分均较治疗前显著提高(P<0.05),其中BBS、TUGT、良好重心分布评分Remo组较对照组有显著提高(P<0.05)。结论:减重蹲起训练可有效改善脑卒中膝过伸患者下肢运动功能。
