Human control of a flexible object

Krotov, Aleksei

doi:10.17760/d20385583

Cited by 2 publications

(2 citation statements)

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“…This energy range covers both the direct and the sequential photoionization from the outer turning points of the involved electronic states. For the optimization of the pulses, the Krotov algorithm 35 has been employed with additional penalty factors that allow us to take into account the experimental conditions listed below.…”

Section: Theoretical Methods and Experimental Conditionsmentioning

confidence: 99%

Optimal Control of Ionization Processes in NaK: Comparison between Theory and Experiment

Schäfer-Bung¹,

Mitrić²,

Bonačić‐Koutecký³

et al. 2004

J. Phys. Chem. A

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We report a good agreement between the shapes of tailored pulses obtained theoretically and experimentally by using the optimal-control theory and the closed-loop learning technique to maximize the ionization yield in NaK. The theoretical pulse shapes are found to be robust regarding the choice of the initial guess. We assign the leading features of the pulse shapes to processes underlying the optimal control and reveal the mechanism which involves an electronic transition followed by a direct two-photon process and sequential one-photon processes at later times. We show that the optimal control not only serves for maximizing the desired yield but also as a tool for the analysis and the identification of the responsible processes.

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Section: Theoretical Methods and Experimental Conditionsmentioning

confidence: 99%

Optimal Control of Ionization Processes in NaK: Comparison between Theory and Experiment

Schäfer-Bung¹,

Mitrić²,

Bonačić‐Koutecký³

et al. 2004

J. Phys. Chem. A

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show abstract

“…All analyses were carried out with custom-written software and built-in functions in Matlab (Mathworks, Natick, MA). For more details on the recording and preprocessing of the data see [27].…”

Section: Data Processingmentioning

confidence: 99%

Motor control beyond reach—how humans hit a target with a whip

et al. 2022

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Humans are strikingly adept at manipulating complex objects, from tying shoelaces to cracking a bullwhip. These motor skills have highly nonlinear interactive dynamics that defy reduction into parts. Yet, despite advances in data recording and processing, experiments in motor neuroscience still prioritize experimental reduction over realistic complexity. This study embraced the fully unconstrained behaviour of hitting a target with a 1.6-m bullwhip, both in rhythmic and discrete fashion. Adopting an object-centered approach to test the hypothesis that skilled movement simplifies the whip dynamics, the whip's evolution was characterized in relation to performance error and hand speed. Despite widely differing individual strategies, both discrete and rhythmic styles featured a cascade-like unfolding of the whip. Whip extension and orientation at peak hand speed predicted performance error, at least in the rhythmic style, suggesting that humans accomplished the task by setting initial conditions. These insights may inform further studies on human and robot control of complex objects.

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Human control of a flexible object

Cited by 2 publications

References 0 publications

Optimal Control of Ionization Processes in NaK: Comparison between Theory and Experiment

Optimal Control of Ionization Processes in NaK: Comparison between Theory and Experiment

Motor control beyond reach—how humans hit a target with a whip

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