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Extra resources for A- and B-stability for Runge-Kutta methods-characterizations and equivalence
Frequency domain analysis (often called “spectral analysis”) is used for detection of muscle fatigue and muscle fibre health. , 2002; Allison & Fujiwara, 2002), although Pullman et al. (2000) suggest the link has not been convincingly established. Copyright © 2006, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. Overview of Movement Analysis and Gait Features 33 Figure 26. Median frequency of normal EMG (line a) reduces when muscle is fatigued (line b) (From Rab, 1994) b MAGNITUDE a 100 200 300 FREQUENCY (Hz) Figure 27.
To reduce the amount of data to a manageable level (dimension reduction), and to keep the most important features of the data and eliminate all the redundant features of the data (feature selection). The idea is to provide a “summary” which can be used to give a meaningful interpretation of the data. The objective of the first step towards feature selection is Copyright © 2006, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited.
In all studies involving inverse dynamics, great care should be taken in the way segment masses and moments of inertia are approximated. Methods of obtaining inertial parameters of body segments can be classified into three groups (Kaufman, 1998): • • Regression equations — usually based on measurements derived from populations of cadavers or living subjects (see Durkin & Dowling, 2003; Yeadon & Morlock, 1989) Geometrical approximation — representing body segment shapes as standard geometric shapes of known mathematical description, usually applied to individu- Copyright © 2006, Idea Group Inc.