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1. Superposition principle applies to human walking with two simultaneous interventions

   https://doi.org/10.1038/s41598-021-86840-9  

   Rasouli, Fatemeh; Kim, Seok Hun; Reed, Kyle B. (December 2021, Scientific Reports)

   null (Ed.)

   Abstract Gait rehabilitation therapies provide adjusted sensory inputs to modify and retrain walking patterns in an impaired gait. Asymmetric walking is a common gait abnormality, especially among stroke survivors. Physical therapy interventions using adaptation techniques (such as treadmill training, auditory stimulation, visual biofeedback, etc.) train gait toward symmetry. However, a single rehabilitation therapy comes up short of affecting all aspects of gait performance. Multiple-rehabilitation therapy applies simultaneous stimuli to affect a wider range of gait parameters and create flexible training regiments. Understanding gait responses to individual and jointly applied stimuli is important for developing improved and efficient therapies. In this study, 16 healthy subjects participated in a four-session experiment to study gait kinetics and spatiotemporal outcomes under training. Each session consisted of two stimuli, treadmill training and auditory stimulation, with symmetric or asymmetric ratios between legs. The study hypothesizes a linear model for gait response patterns. We found that the superposition principle largely applies to the gait response under two simultaneous stimuli. The linear models developed in this study fit the actual data from experiments with the r-squared values of 0.95 or more. 

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2. DeProCams: Simultaneous Relighting, Compensation and Shape Reconstruction for Projector-Camera Systems

   https://doi.org/10.1109/TVCG.2021.3067771  

   Huang, Bingyao; Ling, Haibin (May 2021, IEEE Transactions on Visualization and Computer Graphics)

   null (Ed.)
3. Superposition principle for the simultaneous optimization of collective responses

   https://doi.org/10.1103/PhysRevE.98.012221  

   Dong, S.; Flores, R.; Unger, J.; Su, Q.; Grobe, R. (July 2018, Physical Review E)
4. Decomposition-learning-based Output Tracking to Simultaneous Hysteresis and Dynamics Control: High-speed Large-range Nanopositioning Example

   Liu, Jiangbo; Wang, Jingren; Zou, Qingze (January 2020, IEEE transactions on control systems technology)
5. Compensation of differential dispersion: application to multiband stellar interferometry.

   https://doi.org/10.1093/mnras/stab1922  

   Pannetier, Cyril; Mourard, Denis; Cassaing, Frédéric; Lagarde, Stéphane; Le Bouquin, Jean-Baptiste; Monnier, John; Sturmann, Judit; Ten Brummelaar, Theo (July 2021, Monthly Notices of the Royal Astronomical Society)

   null (Ed.)

   Abstract With the aim of pushing the limiting magnitude of interferometric instruments, the need for wide-band detection channels and for a coordinated operation of different instruments has considerably grown in the field of long-baseline interferometry. For this reason, the Center for High Angular Resolution Astronomy (CHARA), an array of six telescopes, requires a new configuration of longitudinal dispersion compensators to keep the fringe contrast above 95% simultaneously in all spectral bands, while preserving the transmission above 85 %. In this paper, we propose a new method for defining the longitudinal dispersion compensators (LDC) suited for multi-band observations. A literal approximation of the contrast loss resulting from the dispersion residues enables us to define a general criterion for fringe contrast maximisation on several bands simultaneously. The optimization of this criterion leads to a simple solution with only two LDC stages per arm and existing differential delay lines, to the glass choice and a simple linear formula for thickness control of all these media. A refined criterion can also take into account glass transmission. After presenting this criterion, we give the optimal solution (medium, configuration) and its expected performance for the planned observing modes on CHARA. 

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