The relationship between perceived loss of control and passivity in social activities in a non-handicapped institutionalized elderly population was assessed. Perceived loss of control was assessed from three different types of expectancies: low action-outcome expectancies, high situation-outcome expectancies, and low efficacy expectancies. Passivity scores were reported by the staff. The effect...

Human controllers as pilots or drivers can be described by linear time invariant systems cascaded with time delay. Inspired by this, we ‘generalize’ the definition of passivity index to irrational transfer functions and use the passivity index to examine passivity of some existing human models. The results show that the human model is non-passive due to the time delay which represents inherent ...

In this paper, we propose a passivity monitor which evaluates stability of a system based on the concept of passivity, and a software limiter which turns the system stable if it is originally unstable. It is shown that asymptotic stability will be guaranteed for arbitrary robots with arbitrary control schemes and environments, even if their properties are unknown. The validity of the passivity ...

ityl or positive realness in a VLSI model is an important property Passivity in a VLSI model is an important property to guarantee stato guarantee stable global simulation [3,7]. Existing DS passivity ble global simulation. Most VLSI models are naturally described tests are restrnctive in different aspects. For example, the extended as descriptor systems (DSs) or singular state spaces. Passivit...

⎯The passivity and feedback passification problems of fuzzy systems with parameter uncertainties and impulse are first presented in this paper. Based on the parallel distributed compensation (PDC) technique, some passivity and passification conditions are proposed in terms of linear matrix inequalities (LMIs). Numerical examples are given to show the correctness and effectiveness of our theoret...

This paper investigates haptic interaction with virtual environments composed of objects with diverse dynamic properties. Passivity is often used for stability analysis of haptic systems. We demonstrate that when the dynamics of the virtual environment during the interaction changes, the approaches using traditional notion of passivity fail. We then show that a recently proposed notion of passi...

In this paper we provide a rather complete set of passivity suuciency conditions that give asymptotic stabilizability of nonlinear cascades of driving-driven systems. Moreover, we analyze the input-output and input-to-state stability properties of existing stabilization schemes. This allows us to derive the weakest passivity assumption on the driving system that give the required stability. In ...