177,780 research outputs found
State maps for linear systems
No full textModeling of physical systems consists of writing the equations describing a phenomenon and yields as a result a set of differential-algebraic equations. As such, state-space models are not a natural starting point for modeling, while they have utmost importance in the simulation and control phase. The paper addresses the problem of computing state variables for systems of linear differential-algebraic equations of various forms. The point of view from which the problem is considered is the behavioral one, as put forward in [J. C. Willems, Automatica J. IFAC, 22 (1986), pp. 561–580; DynamicsReported,2(1989),pp.171–269;IEEETrans.Automat.Control,36(1991),pp. 259–294]
The subspace Nevanlinna interpolation problem and the most powerful unfalsified model
No full textA generalization of the tangential Nevanlinna interpolation problem will be studied from a behavioral point of view. Necessary and sufficient conditions for its solvability and a characterization of art its solutions are derived. These results are obtained by associating to the interpolation data a behavior that enjoys a special structure. (C) 1997 Elsevier Science B.V
Data and R script for: The Heritability of Self-Control: a Meta-Analysis
No full textThe Heritability of Self-Control: a Meta-AnalysisWork by Y. E. Willems, N. Boesen, J. Li, C. Finkenauer and M. Bartels. Script multi-level meta-analysis heritability self-control: 20190130_meta_SC_heritability_scriptData for the multilevel meta-analysis heritability self-control: 20190130_meta_SC_heritability_dat
The Riccati Equation
No full textcontributions by G. Ammar, T. Basar, R. Bitmead, S. Bittanti, F. M. C. Callier, P. Colaneri, G. De Nicolao, M. Gevers, V. Kucera, P. Lancaster, A. J. Laub, C.F. Martin, L. Rodman, M. A. Shayman, H. L. Trentelman, J. L. Willems, J. C. Willem
Conserved- and zero-mean quadratic quantities in oscillatory systems
No full textWe study quadratic functionals of the variables of a linear oscillatory system and their derivatives. We show that such functionals are partitioned in conserved quantities and in trivially- and intrinsic zero-mean quantities. We also state an equipartition of energy principle for oscillatory systems
C. Willems, Philosophia moralis
No full textSimons G. C. Willems, Philosophia moralis. In: Revue néo-scolastique. 16ᵉ année, n°62, 1909. pp. 322-323
The analysis of feedback systems
No full text"Parts of this monograph appeared in the author's doctoral dissertation entitled 'Nonlinear harmonic analysis' ... 1968."Includes bibliographical references.[by] Jan C. Willems
Reygel, P.C., Willems, W.R. & Artois, T.J. (2011) Koinocystididae and Gnathorhynchidae (Platyhelminthes: Rhabdocoela: Kalyptorhynchia) from the Galapagos, with the description of three new species. Zootaxa, 3096, 27-40.
No full textREYGEL, P. C., WILLEMS, W. R., ARTOIS, T. J. (2011): Reygel, P.C., Willems, W.R. & Artois, T.J. (2011) Koinocystididae and Gnathorhynchidae (Platyhelminthes: Rhabdocoela: Kalyptorhynchia) from the Galapagos, with the description of three new species. Zootaxa, 3096, 27-40. Zootaxa 3132 (1): 68, DOI: 10.11646/zootaxa.3132.1.4, URL: http://dx.doi.org/10.11646/zootaxa.3132.1.
Interconnections and symmetries of linear differentialsystems
No full textIn this paper we study the interplay between control problems and symmetries in the context of linear systems. In particular, we establish sufficient conditions under which it is possible to control a symmetric system in order to make it achieve control objectives, without ''breaking'' its symmetry
Modelling Replacement Demand: A Random Coefficient Approach
No full textReplacement demand due to regular and early retirement, disablement, temporary withdrawals of women owing to birth and child raising, et cetera, constitutes an important element of the future demand for newcomers on the labour market. It is, however, often neglected in manpower forecasting studies. In this paper, we develop a flow model with which we can forecast the replacement demand at a detailed level of types of education. The essential element of the model is the determination of the yearly outflow coefficients for each type of education, distinguished by age category and gender. Instead of applying a fixed coefficient approach (Willems and De Grip (1993), we will introduce the random coefficient estimation technique in the model. This technique takes the reliability of the flow coefficients explicitly into account. If a specific flow coefficient is unreliable, the random coefficient estimate will tend towards the mean value for that age category over the types of education. This means that ad hoc corrections based on judgmental forecasting can be considerably reduced. Moreover, it will be shown that the random coefficient estimates of labour market outflow are more reliable than the estimates of the Willems/De Grip model.labour market entry;
- …
