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Timing and speed are suggested to be the two general factors of coordination that differentiate people across a variety of motor movements. This study provides evidence for a third general factor of coordination, that of force control. Subjects that exhibit low variability in reproducing a target force with one effector, such as the finger, show low variability with other effectors, foot or for...

April 1988 Lids - P - 1764 Lyapunov Exponents for Filtering Problems

The dependence of the optimal nonlinear filter on it's initial conditions is considered for continuous time linear filtering and for finite state space nonlinear filtering. Partial results are obtained in the high signal to noise ration case, together with a characterization of the Lyapunov exponent in the (easier) low SNR case. This work was supported in part by the Air Force Office of Scienti...

An operator - theoretic approach to the mixed - sensitivity minimization problem ( I ) by Fabio Fagnani Scuola Normale

in this paper we consider the mixed-sensitivity minimization problem (scalar case).lt gives rise to the so-called two-block problem on the algebra He; we analyze this problem from an operator point of view, using Krein space theory. We obtain a necessary and sufficient condition for the uniqueness of the solution and a parameterization of all solutions in the non-uniqueness case. Moreover, an i...

Duality and Auxiliary Functions for Bregman Distances

We formulate and prove a convex duality theorem for Bregman distances and present a technique based on auxiliary functions for deriving and proving convergence of iterative algorithms to minimize Bregman distance subject to linear constraints. This research was partially supported by the Advanced Research and Development Activity in Information Technology (ARDA), contract number MDA904-00-C-210...