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The biomechanical behavior of a red blood cell (RBC) is investigated by nanoindentation technique and finite element method. A nanoindentation experiment is carried out to obtain Young's modulus, hardness and load-displacement curve of the RBC, and a 3D finite element model is built to simulate the nanoindentation experiment process. The effect of curvature radius of the indenter tip and friction...
This paper presents a general method for hierarchical feedback control of redundant systems, and applies it to the problem of arm movement control. A high-level feedback controller, designed using optimal control techniques, operates on a simplified virtual plant. A low-level controller is responsible for performing a feedback transformation of the physical plant into the desired virtual plant. The...
Motion capture has been an active research field for many years. Previous methods have mostly focused on converting segment orientations into joint angles. However such methods have a number of drawbacks: the estimates of joint angles are not optimal in a statistical sense; the common assumption that sensor placement is known and constant (relative to the limb) is in practice violated; existing methods...
Sensorimotor control occurs simultaneously on multiple levels. We present a general approach to designing feedback control hierarchies for redundant biomechanical systems, that approximate the (non-hierarchical) optimal control law but have much lower computational demands. The approach is applied to the task of reaching, using a detailed model of the human arm. Our hierarchy has two levels of feedback...
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