[BIC-announce] Seminar in Biomedical Engineering - Wednesday Feb 20th - 1 pm - Room 333

[Christophe Grova]

Dear all,

Our next Biomedical Engineering Dpt seminar  is today

Wednesday - February 20th,  at 1 pm

Location: Room  333 Lyman Duff Building (Biomedical Engineering Dpt, 3775  University Street).

Speaker: Diego Luis Guarin Lopez, Master student under the supervision of Dr. R. Kearney, BME, McGill University

Since Diego is a Master student registered to the course BMDE500 who is giving this seminar as part of McGill conditions to obtain his M.Sc., special attendance from our department (staff and students) is really expected, in order to give Diego feedback on his research studies.

Title : Identification of a parametric, discrete-time model for dynamic ankle stiffness

Abstract:
  Dynamic ankle joint stiffness defines the relationship between the position of the ankle and the torque acting about it and can be separated into intrinsic and reflex components. Under stationary
conditions, intrinsic stiffness can be described by a linear second order system while reflex stiffness is described by Hammerstein system (a static nonlinearity followed by a linear dynamic system) whose input is delayed velocity. Given that reflex and intrinsic torque cannot be measured separately, there has been much interest in the development of system identification techniques to separate them analytically. To date, most methods have been nonparametric and as a result it is necessary to identify a large number of parameters and there is no direct link between the estimated parameters and those of the stiffness model. In this study we developed a novel algorithm for identification of a discrete-time parametric model of ankle stiffness. Thus model has fewer parameters and they are directly related to those off the ankle stiffness model. Simulation studies show that the algorithm gives unbiased results even in the presence of large amounts is colored noise. Pilot studies using experimental data demonstrates that the new method produces models that describe behavior as well as nonparametric methods while providing direct insight into stiffness behavior.


A list of upcoming seminars can be found at : http://www.mcgill.ca/bme/news/seminars

See you there


Christophe Grova


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Christophe Grova, PhD
Assistant Professor
Biomedical Engineering Dpt
Neurology and Neurosurgery Dpt

Montreal Neurological Institute
Centre de Recherches Mathématiques

Biomedical Engineering Department - Room 304
McGill University
3775 University Street, Montreal, Quebec, Canada, H3A 2B4
email : christophe.grova at mcgill.ca
tel : (514) 398 2516
fax : (514) 398 7461

web:
http://www.mni.mcgill.ca/research/gotman/members/christophe.html
http://www.bmed.mcgill.ca/
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