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- J A Villegas, Y Le Gorrec, H Zwart, A J Van Der Schaft
- 2005

In this paper we show how to formulate a boundary control system in terms of the system node, that is, as an operator S := A&B C&D : D(S) → [ X Y ] where X is the state space and Y is the output space. Here we give results which show how to find the top part of this operator and its domain in an easy way. For a class of boundary control systems, associated… (More)

—We study a class of partial differential equations (with variable coefficients) on a one dimensional spatial domain with control and observation at the boundary. For this class of systems we provide simple tools to check exponential stability. This class is general enough to include models of flexible structures, traveling waves, heat exchangers, and… (More)

- J A Villegas, H Zwart, Y Le Gorrec, B Maschke, A J Van Der Schaft
- 2005

— We study a class of partial differential equations on a one dimensional spatial domain with control and observation at the boundary. For this class of systems we describe how to obtain an impedance energy-preserving system, as well as scattering energy-preserving system. For the first type of systems we consider (static and dynamic) feedback stabilization… (More)

- J A Villegas, Y Le Gorrec, H Zwart, B Maschke
- 2005

In this paper we study a class of partial differential equations (PDE's), which includes Sturm-Liouville systems and diffusion equations. From this class of PDE's we define systems with control and observation through the boundary of the spatial domain. That is, we describe how to select boundary conditions, such that the resulting system has inputs and… (More)

- Hans Zwart, Yann Le Gorrec, Bernhard Maschke, Javier Villegas, H Zwart, J A Villegas
- 2008

We study hyperbolic partial differential equations on a one dimensional spatial domain with control and observation at the boundary. Using the idea of feedback we show these systems are well-posed in the sense of Weiss and Salamon if and only if the state operator generates a C 0-semigroup. Furthermore, we show that the corresponding transfer function is… (More)

- M F Latini, C A Fiore, L M Romano, E Spadaro, J P Zorrilla, S E Gonorazky +2 others
- Neurología
- 2012

INTRODUCTION
Chronic subdural hematoma in adults (CSDH) has a global crude incidence of 14.1/100,000 per year in our institution captive population. There is no single treatment protocol. In our hospital we choose a minimal invasive technique (trans-marrow puncture) without general anaesthesia due to the age of the population. A descriptive study of… (More)

- Y Le Gorrec, B Maschke, J A Villegas, H Zwart
- 2006

In this paper we consider distributed parameter physical systems composed of a reversible part associated with a skew-symmetric operator J as Hamiltonian systems [5] and a symmetric operator associated with some irreversible phenomena. We will show how to use results obtained on reversible systems to parametrize the boundary conditions such that the… (More)

- J A Villegas, H Zwart, A J Van Der Schaft
- 2005

This article studies the telegrapher's equations with boundary port variables. Firstly, a link is made between the telegrapher's equations and a skew-symmetric linear operator on a spatial domain. Associated to this linear operator is a Dirac structure which includes the port variables on the boundary of this spatial domain. Secondly, we present all… (More)

- L R Huang, Mao, V C Onclusion, R F Curtain, A J Pritchard, An +14 others
- 2015

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