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Papers by Raymond Hanus
Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe
Proceedings of the 1992 IEEE International Symposium on Intelligent Control
ABSTRACT
1999 European Control Conference (ECC), 1999
The conditioning technique has been conceived and must always be considered as an a posteriori an... more The conditioning technique has been conceived and must always be considered as an a posteriori anti-windup method (the a priori knowledge of the non-linearity acting on the desired control variable has not to be known, provided a post-measurement of the actual control variable is furnished). And in this sense this kind of "backward" anti-windup should always be used because it is never possible to prejudge of any non-linearity that could appear. However, when an a priori knowledge of some non-linearities are known, it is possible to include this knowledge either in the synthesis of the control or in the conception of a "forward" anti-windup. Two examples of forward anti-windups are given in the paper, namely the optimal conditioning and the predictive conditioning techniques.
info:eu-repo/semantics/nonPublishe
info:eu-repo/semantics/publishe
Automatique et ingénierie système, 2015
IFAC Proceedings Volumes, 1998
This note deals with the representation of continuous-time periodic systems as discrete-time inva... more This note deals with the representation of continuous-time periodic systems as discrete-time invariant systems in state-space form using the lifting technique. More precisely, we derive an infinite-dimensional state equation on a Hilbert space for continuous-time periodically time-varying systems and characterize the structure of the spectrum of the discrete semigroup generator. Copyright © 1998 IFAC Resume: Cet article traite de la modelisation des sytemes periodiques a temps continu sous forme de systemes a temps discret en representation d'etat grace a la technique du lifting. On montre que la dynamique des systemes periodiques est decrite par une equation aux differences du premier ordre sur un espace Hilbertien et on caracterise la structure du spectre du g€merateur de semigroupe discret.
info:eu-repo/semantics/publishe
Mathematics and Computers in Simulation, 1994
SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Lecture Notes in Control and Information Sciences
ABSTRACT
Adaptive Systems in Control and Signal Processing 1983, 1984
Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148), 2001
ABSTRACT The purpose of this paper is the study of controllability properties of a continuous-tim... more ABSTRACT The purpose of this paper is the study of controllability properties of a continuous-time system controlled by a digital controller. The study is carried out in the modern lifting framework in which the continuous-time periodicity of such an overall system, called also a sampled-data system, is converted into time-invariance of an infinite-dimensional input/output system in discrete-time. Different concepts of controllability related directly to the continuous-time behavior of sampled-data systems axe introduced, namely exact, approximate and null controllability. It is shown that the two former notions never occur in sampled-data systems while the latter notion is a generic property for these systems
Measurement, 1984
In most sleep laboratories, sleep analysis is still routinely performed by a tedious visual exami... more In most sleep laboratories, sleep analysis is still routinely performed by a tedious visual examination of electrophysiological signal recordings (3 h per night). In the present paper, we have developed a system for on-line automatic sleep analysis. The method involves three major steps. First, data compression is achieved by extracting outstanding spectral features of the EEG, and a number of phasic events (Spindles, eye movements, etc). In the second step, a local sleep stage decision is evaluated in terms of probability, according to Bayesian theory. Finally, we perform Bayesian smooth ing of the hypnogram, introducing the dynamics of sleep physiology, in order to score the sleep stages in a much broader co ntext. The system is running on a PDP 11-44 computer and keeps over 85% reliability when compared with visual analysis. The results have been averaged on 30 sleep records from 10 healthy volunteers aged between 14 and 40.
Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe
Proceedings of the 1992 IEEE International Symposium on Intelligent Control
ABSTRACT
1999 European Control Conference (ECC), 1999
The conditioning technique has been conceived and must always be considered as an a posteriori an... more The conditioning technique has been conceived and must always be considered as an a posteriori anti-windup method (the a priori knowledge of the non-linearity acting on the desired control variable has not to be known, provided a post-measurement of the actual control variable is furnished). And in this sense this kind of "backward" anti-windup should always be used because it is never possible to prejudge of any non-linearity that could appear. However, when an a priori knowledge of some non-linearities are known, it is possible to include this knowledge either in the synthesis of the control or in the conception of a "forward" anti-windup. Two examples of forward anti-windups are given in the paper, namely the optimal conditioning and the predictive conditioning techniques.
info:eu-repo/semantics/nonPublishe
info:eu-repo/semantics/publishe
Automatique et ingénierie système, 2015
IFAC Proceedings Volumes, 1998
This note deals with the representation of continuous-time periodic systems as discrete-time inva... more This note deals with the representation of continuous-time periodic systems as discrete-time invariant systems in state-space form using the lifting technique. More precisely, we derive an infinite-dimensional state equation on a Hilbert space for continuous-time periodically time-varying systems and characterize the structure of the spectrum of the discrete semigroup generator. Copyright © 1998 IFAC Resume: Cet article traite de la modelisation des sytemes periodiques a temps continu sous forme de systemes a temps discret en representation d'etat grace a la technique du lifting. On montre que la dynamique des systemes periodiques est decrite par une equation aux differences du premier ordre sur un espace Hilbertien et on caracterise la structure du spectre du g€merateur de semigroupe discret.
info:eu-repo/semantics/publishe
Mathematics and Computers in Simulation, 1994
SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Lecture Notes in Control and Information Sciences
ABSTRACT
Adaptive Systems in Control and Signal Processing 1983, 1984
Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148), 2001
ABSTRACT The purpose of this paper is the study of controllability properties of a continuous-tim... more ABSTRACT The purpose of this paper is the study of controllability properties of a continuous-time system controlled by a digital controller. The study is carried out in the modern lifting framework in which the continuous-time periodicity of such an overall system, called also a sampled-data system, is converted into time-invariance of an infinite-dimensional input/output system in discrete-time. Different concepts of controllability related directly to the continuous-time behavior of sampled-data systems axe introduced, namely exact, approximate and null controllability. It is shown that the two former notions never occur in sampled-data systems while the latter notion is a generic property for these systems
Measurement, 1984
In most sleep laboratories, sleep analysis is still routinely performed by a tedious visual exami... more In most sleep laboratories, sleep analysis is still routinely performed by a tedious visual examination of electrophysiological signal recordings (3 h per night). In the present paper, we have developed a system for on-line automatic sleep analysis. The method involves three major steps. First, data compression is achieved by extracting outstanding spectral features of the EEG, and a number of phasic events (Spindles, eye movements, etc). In the second step, a local sleep stage decision is evaluated in terms of probability, according to Bayesian theory. Finally, we perform Bayesian smooth ing of the hypnogram, introducing the dynamics of sleep physiology, in order to score the sleep stages in a much broader co ntext. The system is running on a PDP 11-44 computer and keeps over 85% reliability when compared with visual analysis. The results have been averaged on 30 sleep records from 10 healthy volunteers aged between 14 and 40.