Searched for: subject%3A%22Linear%255C+systems%22
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Enschedé, Sabine (author)
This paper is a research in positive controllability and stabilizability for discrete-time linear systems. Several conditions are given and explained for both single input as multiple input systems. Also the connection between controllability and reachability will be mentioned. Furthermore, a method for multiple input positive controllability is...
bachelor thesis 2020
document
Beaudoin, A. (author), De Dreuzy, J.R. (author), Erhel, J. (author)
Subsurface hydraulic properties are mainly governed by the heterogeneity of the porous medium considered. Our work aims at characterizing the asymptotic dispersion coefficients for highly heterogeneous permeability fields triggered by advection and constant local dispersion-diffusion. We have developed a fully parallel software for simulating...
conference paper 2006
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Giraud, L. (author), Gratton, S. (author)
In this paper we present some aspects of recent works we have been developping on preconditioning techniques for accelerating Krylov solvers that are based on low rank corrections of a prescribed preconditioner. For SPD linear systems, we investigate the behaviour of some techniques based on spectral approaches when the eigenelements are only...
conference paper 2006
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Hemker, P.W. (author), Wesseling, P. (author), De Zeeuw, P.W. (author)
conference paper 1984
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Yamazaki, Ichitaro (author), Heinlein, A. (author), Rajamanickam, Sivasankaran (author)
The generalized Dryja–Smith–Widlund (GDSW) preconditioner is a two-level overlapping Schwarz domain decomposition (DD) preconditioner that couples a classical one-level overlapping Schwarz preconditioner with an energy-minimizing coarse space. When used to accelerate the convergence rate of Krylov subspace iterative methods, the GDSW...
conference paper 2023
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van de Ruit, M. (author), Eisemann, E. (author)
Spectral rendering is a crucial solution for photorealistic rendering. However, most available texture assets are RGB-only, and access to spectral content is limited. Uplifting methods that recover full spectral representations from RGB inputs have therefore received much attention. Yet, most methods are deterministic, while, in reality,...
conference paper 2023
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Xu, J. (author), Busoniu, L (author), van den Boom, A.J.J. (author), De Schutter, B.H.K. (author)
This paper addresses the infinite-horizon optimal control problem for max-plus linear systems where the considered objective function is a sum of discounted stage costs over an infinite horizon. The minimization problem of the cost function is equivalently transformed into a maximization problem of a reward function. The resulting optimal...
conference paper 2016
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Baldi, S. (author), Valmorbida, Giorgio (author), Papachristodoulou, Antonis (author), Kosmatopoulos, Elias B. (author)
This work proposes an online policy iteration procedure for the synthesis of sub-optimal control laws for uncertain Linear Time Invariant (LTI) Asymptotically Null-Controllable with Bounded Inputs (ANCBI) systems. The proposed policy iteration method relies on: a policy evaluation step with a piecewise quadratic Lyapunov function in both the...
conference paper 2016
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Anil Meera, A. (author), Wisse, M. (author)
The free energy principle (FEP) from neuroscience provides a framework called active inference for the joint estimation and control of state space systems, subjected to colored noise. However, the active inference community has been challenged with the critical task of manually tuning the noise smoothness parameter. To solve this problem, we...
conference paper 2022
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van Haren, Max (author), Blanken, Lennart (author), Oomen, T.A.E. (author)
Frequency-domain representations of multirate systems are essential for controller design and performance evaluation of multirate systems and sampled-data control. The aim of this paper is to develop a time-efficient closed-loop identification approach for multirate systems in the frequency-domain. The developed method utilizes local polynomial...
conference paper 2022
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Safaei Farahani, S. (author)
Stochastic max-plus systems belong to a special class of discrete-event systems. This class consists of systems with synchronization but no choice and the models of such systems are defined using the operators maximization and addition. Stochastic max-plus systems can be further extended to stochastic switching max-plus systems and stochastic...
doctoral thesis 2012
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Adzkiya, D. (author)
Max-Plus-Linear (MPL) systems are a class of discrete-event systems with a continuous state space characterizing the timing of the underlying sequential discrete events. These systems are predisposed to describe the timing synchronization between interleaved processes. MPL systems are employed in the analysis and scheduling of infrastructure...
doctoral thesis 2014
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Collignon, T.P. (author)
This dissertation deals mainly with the design, implementation, and analysis of efficient iterative solution methods for large sparse linear systems on distributed and heterogeneous computing systems as found in Grid computing. First, a case study is performed on iteratively solving large symmetric linear systems on both a multi–cluster and a...
doctoral thesis 2011
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Dankers, A.G. (author)
Systems in engineering such as power systems, telecommunication systems, and distributed control systems are becoming more complex and interconnected. Many of these systems are part of the foundation of modern society and their seamless operation is paramount. However, the increasing complexity and size of the systems poses real engineering...
doctoral thesis 2014
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Kersbergen, B. (author)
The operation of many systems can be described by the timing of events. When the system behavior can be described by equations that are "linear'' in the max-plus algebra, which has maximization and addition as its basic operations, the system is called a max-plus-linear system. In many of these systems the order of the events may need to be...
doctoral thesis 2015
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Necoara, I. (author)
This Ph.D. thesis considers the development of new analysis and control techniques for special classes of hybrid systems and discrete event systems. Two particular classes of hybrid systems (piecewise affine systems and max-min-plus-scaling systems), and two particular classes of discrete event systems (max-plus-linear systems and switching max...
doctoral thesis 2006
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Xu, J. (author)
This PhD thesis considers the development of optimization and model-based control techniques for max-plus linear (MPL) and continuous piecewise affine (PWA) systems. The three main topics investigated in this thesis are as follows: 1. Optimistic optimization and planning for model-based control of MPL systems; 2. Optimistic optimization for MPC...
doctoral thesis 2019
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Liu, J. (author)
The ability to model irregular data and the interactions between them have<br/>extended the traditional signal processing tools to the graph domain. Under<br/>these circumstances, the emergence of graph signal processing has offered a<br/>brand new framework for dealing with complex data. In particular, the graph<br/>Fourier transform (GFT) lets...
doctoral thesis 2021
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Yuan, S. (author)
As a special class of hybrid systems, switched systems have attracted a lot of attention in the last decade due to theoretical and practical interests. When controlling switched systems, a ubiquitous problem is the presence of large parametric uncertainties and external disturbances. However, the state of the art on adaptive and robust control...
doctoral thesis 2018
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Baumann, M.M. (author)
Seismic Full-Waveform Inversion is an imaging technique to better understand the earth's subsurface. Therefore, the reflection intensity of sound waves is measured in a field experiment and is matched with the results from a computer simulation in a least-squares sense. From a computational point-of-view, but also from an economic view point,...
doctoral thesis 2018
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