In this paper, the problem of stability analysis is investigated for a particular class linear discrete time-delay systems .The criteria are derived by Lyapunov’s direct method using minimization with respect to a scalar parameter and they are expressed by norm and eigenvalue of appropriate matrices. The derived results present new delay independent stability conditions for linear discrete time...

We study a class of problems involving the motion of a linear elastic body in frictional contact with a linear elastic half space. The dynamic effects considered are the inertial properties of the body regarded as rigid. We study only those regimes of contact interaction for which the slip velocity with the body taken as absolutely rigid and the time rate of change of the elastic displacements ...

Chromospheric Ca II H and K uxes have been measured in a sample of 100 stars on or near the lower main sequence at Mount Wilson Observatory. Observations were made several times a week and span more than ten years. Within an observing season, many stars show periodic variations due to rotation. Thirty-six of the stars have highly-signiicant periods in at least ve seasons. We compute the range i...

This study investigates the influence of stimulus properties on explorative movement parameters in active touch. Using a PHANToM force-feedback device we generated virtual stimuli with different stiffness values. Participants freely explored pair-wise presented stimuli and were asked to select the softer one. Afterwards we analyzed their explorative movements considering the parameters velocity...

The purpose of the study is to explore particular challenges faced when designing virtual environments for children with autism, with the purpose of training social skills. Our findings are based on studying autistic behaviour during three years (primary and secondary sources), analysis of related system and other computer mediated assistive technology, as well as general game design. From thes...