February 05, 2015 / by George Council / In news

The roller coaster flight strategy of bar-headed geese conserves energy during Himalayan migrations

A paper that explores the flight pattersn of migrating geese over the Himalayan Mountains. Beyond presenting a measured result that disputes prior hypothesis, it also illustrates that geese are demonstrating a behavior that is very 'non-engineer-like' - humans would never build a passanger aircraft that varies altitude so dramatically

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February 05, 2015 / by George Council / In news

Stabilization of Nonlinear Systems Nonlinearly Depending on Fast Time-Varying Parameters- An Immersion and Invariance Approach

A paper that might be interesting to compare to the lab's own investigation in how to detail with parameter uncertainty in hybrid systems. Mitigating the influence of unknown parameter changes in a system is a major concern in locomotion, and being able to extend this papers result to a hybrid system could provide a new tool

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February 05, 2015 / by George Council / In news

Preparing the leg for ground contact in running - the contribution of feed-forward and visual feedback

A paper, among many, that explores the usage of feedforward control in perserving periodic gaits in SLIP-like models. As the lab has contributed to this discussion in a very general way, it is useful to examine other groups' special-case result to see if our result encompasses it, or it is an novel technique. Interestingly, this paper consists of experiemental measurements of acutal muscle activity in moving humans - suggesting that feedforward muscle activity is sufficient to explain previously observed feed-forward leg adjustments.

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