This paper investigates the exact controllability of the SCOLE (NASA Spacecraft Control Laboratory Experiment) model. This model describes the movement in one plane of a beam clamped at one end and connected to a rigid body at the other end. The mass and moment of inertia of the rigid body are not negligible. The inputs are the force and the torque acting on the rigid body. The importance of th...

Improving energy efficiency is probably the most generic issue for the process industry today, and process integration is a common tool to successfully achieve this. However, an increased level of process integration, usually implemented by re-circulation and other physical feedback structures, can increase the complexity of the dynamics drastically. This, in turn, implies increased control dif...

Problems of controllability and motion planning of distributed parameter systems have been addressed in a number of monographs and research papers (see, e.g., [1-4]). On the one hand, the question of the approximate controllability of a linear time-invariant system on a Hilbert space can be formulated in terms of an invariant subspace of the corresponding adjoint semigroup [4]. On the other han...

In this paper two-dimensional (2D) discrete behaviors, defined on the grid Z+ × Z and having the time as (first) independent variable, are investigated. For these behaviors, by emphasizing the causality notion that is naturally associated with the time variable, we introduce two new concepts of controllability. Algebraic characterizations of time-controllability and of zerotime-controllability ...

People can respond to bad news in a variety of ways. The Bad News Response Model suggests that three aspects of bad news (the controllability, likelihood, and severity of negative consequences) predict which response (Watchful Waiting, Active Change, or Acceptance) people are likely to choose. This article presents an initial test of the predictions of the Bad News Response Model. College stude...

We study the controllability of the Bloch equation, for an ensemble of non interacting half-spins, in a static magnetic field, with dispersion in the Larmor frequency. This system may be seen as a prototype for infinite dimensional bilinear systems with continuous spectrum, whose controllability is not well understood. We provide several mathematical answers, with discrimination between approxi...

In this paper we present a deenition of \connguration controllability" for mechanical systems whose Lagrangian is kinetic energy with respect to a Riemannian metric minus potential energy. A computable test for this new version of controllability is also derived. This condition involves a new object which we call the symmetric product. Of particular interest is a deenition of \equilibrium contr...

Keywords: Impulsive stochastic systems Integro-differential systems Schaefer's fixed point theorem Complete controllability a b s t r a c t This paper is concerned with the controllability of impulsive stochastic integro-differential systems. Sufficient conditions of complete controllability for impulsive stochastic integro-differential systems are obtained by using Schaefer's fixed point theor...

We discuss the approximate controllability of nonlinear fractional integro-differential system under the assumptions that the corresponding linear system is approximately controllable. Using the fixed-point technique, fractional calculus and methods of controllability theory, a new set of sufficient conditions for approximate controllability of fractional integro-differential equations are form...

This note investigates the minimal number of unilateral thrusters required for diierent versions of nonlinear controllability of a planar rigid body. For one to three unilateral thrusters, we get a new property with each additional thruster: one thruster yields small-time accessibility on the body's state space TSE(2); two thrusters yield global controllability on TSE(2); and three thrusters yi...