摘要
基于扩散熵的平衡估计,评估了儿童步态间隔时间序列的分形指数,并讨论了其动力学机制.研究结果表明,儿童行走序列的分形指数与年龄之间并没有明确的关系,少数样本没有长程相关性或者具有离散的长程相关性.此外,扩散熵的平衡估计与去趋势波动分析的比较结果显示,部分样本符合Levy行走过程而并非分数布朗运动.
Long-range correlations embedded in stride series were evaluated by means of balanced estimation of diffusion entropy. The results show that there is no statistically monotonical relation between the long-range correlation and the age. Especially, one cannot find long-range correlation characteristics in some samples. The comparison between the results of balanced estimation of diffusion entropy and detrended fluctuation analysis shows that some samples may obey Levy walk processes, instead of fractional Brownian motions.
出处
《上海理工大学学报》
CAS
北大核心
2014年第2期147-153,共7页
Journal of University of Shanghai For Science and Technology
基金
国家自然科学基金资助项目(10975099
10635040)
上海市一流学科建设资助项目(XTKX2012)
关键词
跨步时间变异性
分形指数
去趋势波动分析
扩散熵的平衡估计
stride duration variability
fractal scaling index
detrended fluctuationanatysis
batanced estimation of diffusion entropy
