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- George Weiss
- MCSS
- 1994

- Marius Tucsnak, George Weiss
- SIAM J. Control and Optimization
- 2003

- George Weiss
- 2007

We discuss the concept of a repetitive control system, and recall the main stability theorem for such systems. We give new, improved estimates on the error signal in a repetitive control system. As an extension of repetitive control, we introduce a new control system which is capable of tracking (or rejecting) a superposition of several periodic signals… (More)

- Martin Weiss, George Weiss
- MCSS
- 1997

The paper extends quadratic optimal control theory to weakly regular linear systems, a rather broad class of infinite-dimensional systems with unbounded control and observation operators. We assume that the system is stable (in a sense to be defined) and that the associated Popov function is bounded from below. We study the properties of the optimally… (More)

We survey the literature on well-posed linear systems, which has been an area of rapid development in recent years. We examine the particular subclass of conservative systems and its connections to scattering theory. We study some transformations of well-posed systems, namely duality and time-flow inversion, and their effect on the transfer function and the… (More)

- GEORGE WEISS
- 2005

We consider infinite-dimensional linear systems without a-priori wellposedness assumptions, in a framework based on the works of M. Livšic, M.S. Brodskĭı, Y.L. Smuljan and others. We define the energy in the system as the norm of the state squared (other, possibly indefinite quadratic forms will also be considered). We derive a number of equivalent… (More)

- George Weiss, Martin Häfele
- Automatica
- 1999

- George Weiss, Richard Rebarber
- SIAM J. Control and Optimization
- 2000

An infinite-dimensional linear system described by ẋ(t) = Ax(t) + Bu(t) (t ≥ 0) is said to be optimizable if for every initial state x(0), an input u ∈ L2 can be found such that x ∈ L2. Here, A is the generator of a strongly continuous semigroup on a Hilbert space and B is an admissible control operator for this semigroup. In this paper we investigate… (More)

- Carolyn F Wong, George Weiss, George Ayala, Michele D Kipke
- AIDS education and prevention : official…
- 2010

We examined the relationship among social discrimination, violence, and illicit drug use among an ethnically diverse cohort of young men who have sex with men (YMSM) residing in Los Angeles. Five Hundred twenty-six YMSM (aged 18-24 years) were recruited using a venue-based, stratified probability sampling design. Surveys assessed childhood financial… (More)

- Jonathan R. Partington, George Weiss
- MCSS
- 2000