Assisting human locomotion with ankle exoskeletons is a complicated task, requiring consideration of both biological and device contributions to assisted joint mechanics. Assistance techniques have typically involved some combination of work input and torque support. The complex interaction that arises between the exoskeleton and human neuromuscular system, however, makes it difficult to unders...

A statistical study of ®eld-aligned electron beams associated with up ̄owing ion conics is presented from Exos-D (Akebono) observations below 10 000 km. The electron beams are narrowly collimated along the ®eld line and generally have energies of several tens of eV. They are divided in the analysis into three types: up ̄owing, down ̄owing, and counterstreaming. All the types of electron beams are ...

In this paper, we show how to use audio to supervise the learning of active speaker detection in video. Voice Activity Detection (VAD) guides the learning of the vision-based classifier in a weakly supervised manner. The classifier uses spatio-temporal features to encode upper body motion facial expressions and gesticulations associated with speaking. We further improve a generic model for acti...

We consider the numerical simulation of rigid body motion in multiphase incompressible Navier-Stokes flow. The motion is formulated as an optimization problem and determined by minimizing an objective function in terms of forces and moments acting on the body, constrained by the multiphase Navier-Stokes equations. The corresponding adjoint system and boundary conditions are derived and derivati...

Observations have been made of the growth and collapse of surface and cloud cavitation on a finite aspect ratio hydrofoil oscillating in pitch. The cavitation was recorded using both still and high-speed motion picture photography, and the variations with cavitation number and reduced frequency of oscillation were investigated. The noise generated by the cavity collapse was also measured and an...

The paper describes a simple analytical framework to be used when designing control algorithms for systems of specific type – in which the state derivatives go in feedback as accelerometer signals, and the overall controller explicitly exhibits an algebraic disturbance feedback loop. A simplified hydrofoil craft linear model is treated as an example. The method proposed combines all the approac...

in this paper, a new structure possessing the advantages of low-power consumption, less hardware and high-speed is proposed for fuzzy controller. the maximum output delay for general fuzzy logic controllers (flc) is about 86 ns corresponding to 11.63 mflips (fuzzy logic inference per second) while this amount of the delay in the designed fuzzy controller becomes 52ns that corresponds to 19.23 m...

This paper presents a novel hybrid human-machine interface (HMI) designed for hands-free control of electric powered wheelchairs. Both forehead electromyography (EMG) signals and colour face image information are deployed to identify winking and jaw clenching movements of human face. Five winking and jaw clenching movement patterns are selected and classified, mapping into six control commands ...