Linear and nonlinear triple diffusive convection in the presence of sinusoidal/non-sinusoidal gravity modulation: A comparative study

2021 ◽  
Vol 113 ◽  
pp. 103694
Author(s):  
S. Pranesh ◽  
P.G. Siddheshwar ◽  
Yi Zhao ◽  
Ansa Mathew
Keyword(s):  
Comparative Study ◽  
Gravity Modulation ◽  
Diffusive Convection ◽  
Linear And Nonlinear

A Comparative Study for Postural Synergy Synthesis Using Linear and Nonlinear Methods

2016 ◽  
Vol 13 (03) ◽  
pp. 1650009 ◽  
Author(s):  
Kai Xu ◽  
Huan Liu ◽  
Yuheng Du ◽  
Xiangyang Zhu
Keyword(s):  
Comparative Study ◽  
Latent Variable ◽  
Robotic Hand ◽  
Nonlinear Method ◽  
Variable Model ◽  
Nonlinear Methods ◽  
Nonlinear Dimension Reduction ◽  
Linear And Nonlinear ◽  
Nonlinear Dimension ◽  
Postural Synergies

Human controls dozens of muscles for different hand postures in a coordinated manner. Such coordination is referred to as a postural synergy. Postural synergy has enabled an anthropomorphic robotic hand with many actuators to be applied as a prosthetic hand and controlled by two to three channels of biological signals. Principle component analysis (PCA) of the hand postures has become a popular way to extract the postural synergies. However, relatively big errors are often produced while the hand postures are reconstructed using these PCA-synthesized synergies due to the linearity nature of this method. This paper presents a comparative study in which the postural synergies are synthesized using both linear and nonlinear methods. Specifically, the Gaussian process latent variable model (GPLVM), as a nonlinear dimension reduction method, is implemented to produce nonlinear postural synergies and the hand postures can then be reconstructed from the two-dimensional synergy plane. Computational and experimental verifications show that the posture reconstruction errors are greatly reduced using this nonlinear method. The results suggest that the use of nonlinear postural synergies should be considered while applying a dexterous robotic hand as prosthesis. Versatile hand postures could be formed via only two channels of bio-signals.

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