Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 40 for “"discrete systems"”.
-
Homoclinic snaking in discrete systems
… bifurcations of localized solutions in discrete systems, i.e., the discrete Swift-Hohenberg, an optical cavity equation, and the discrete Allen-Cahn equation, which have infinitely multiplicity called homoclinic snaking. First, we study the discrete Swift-Hohenberg equation with cubic …
-
Control of Stochastic Linear Discrete Systems With Random Parameters
Made available in DSpace on 2014-12-08T22:24:47Z (GMT). No. of bitstreams: 1 7013524.pdf: 1487377 bytes, checksum: c1d19b56562f1a2786f069a4f8b84471 (MD5) Previous issue date: 1969
-
A general purpose State Architecture Simulator for discrete systems with application in data communication protocols
… implementation of data communication protocol systems;This dissertation presents a language, namely State Architecture Notation (SAN), for specifying models of protocol systems and describes an important companion simulation tool, namely, the State Architecture Simulator (SAS);The syntax and …
-
Optimal feedback control for nonlinear discrete systems and applications to optimal control of nonlinear periodic ordinary differential equations
… of the optimal feedback control for nonliner systems (both discrete and ODE) and nonquadratic cost functions in order to achieve improved performance and larger regions of asymptotic stability in the nonlinear system context. The main work of this thesis is carried out in two parts; the first …
-
A continuum limit of a finite discrete nonlinear Schroedinger system
A continuum limit of a discrete nonlinear Schrodinger system of ordinary differential equations is analyzed. The central question is the relation between the solution of the formally derived limiting system of partial differential equations and the limiting behavior of the solutions to the discrete …
-
Macroscopic order from reversible and stochastic lattice growth models
… of physically motivated microscopic models of discrete systems which incorporate the constraints of locality, uniformity, and exact conservation laws. The features studied include: stochastic nonequilibrium fluctuations; use of pseudo-randomness in dynamical simulations; the thermodynamics of …
-
Coordinating agile systems through the model-based execution of temporal plans
Agile autonomous systems are emerging, such as unmanned aerial vehicles (UAVs), that must robustly perform tightly coordinated time-critical missions; for example, military surveillance or search-and-rescue scenarios. In the space domain, execution of temporally flexible plans has provided an …
-
Nonsmooth Bifurcations and the Role of Density Dependence in a Chaotic Infectious Disease Model
Discrete dynamical systems can exhibit rich and interesting dynamics at lower dimensions (and co-dimensions) than that of ODE models. Classically, the minimal dimension to observe chaotic behavior in an ODE model is three; whereas it can be achieved in a one-dimensional discrete map. It is often …
-
Maximum likelihood estimation in dynamical systems
Short description of contents: <br> <br>Dynamical systems are frequently used to model the time evolution of a system. <br>Typically, they depend on unknown parameters and their trajectories <br>are only partially observed. <br>Here maximum likelihood methods are used for the estimation of the …
-
Implementation of a digital control system analysis program using the z-transform
… a wide range of tools to aid the engineer. For discrete systems the z-transform is one such tool. This paper discusses the development and application of a computer program which utilizes the z-transform in the analysis of univariate, linear, time-invariant discrete control systems. The analysis …
-
A framework for testing cyber-physical systems : input generation and causal analysis
Cyber-Physical Systems (CPSs) integrate computational systems into their physical environments; components for products such as automobiles and airplanes are examples of modern CPSs. Their complexity originates from their multidisciplinary design which typically comprises discrete and continuous …
-
Predicate Diagrams as Basis for the Verification of Reactive Systems
… for verifying temporal properties of reactive systems. Diagrams integrate deductive and algorithmic verification techniques for the verification of finite and infinite-state systems, thus combining the expressive power and flexibility of deduction with the automation provided by algorithmic …
-
Numerical Boundary Conditions for the Fourth -Order Accurate Finite -Difference Time -Domain Solution of Maxwell's Equations
… schemes. The eigenvalue analysis of the fully discrete systems shows the influence of boundary conditions on the original fourth-order schemes. Numerical experiments using two- and three-dimensional rectangular cavities verify that the proposed numerical boundary conditions preserve the …
-
Lagrangian structures and multidimensional consistency
… is a key integrability property of certain discrete systems; it implies that we are dealing with infinite hierarchies of compatible equations rather than with one single equation. Requiring the property of multidimensional consistency to be reflected also in the Lagrangian formulation of …
-
Generalized conflict learning for hybrid discrete/linear optimization
… the core of practical, model-based reasoning systems for the last three decades. In many of these applications there is a series of discrete constraint optimization problems and a conflict-directed search algorithm, which uses conflicts in the forward search step to focus search away from …
-
Discrete Nonlinear Wave Propagation In Kerr Nonlinear Media
Discrete optical systems are a subgroup of periodic structures in which the evolution of a continuous electromagnetic field can be described by a discrete model. In this model, the total field is the sum of localized, discrete modes. Weakly coupled arrays of single mode channel waveguides have been …
-
Applicability Of Continuum Fracture Mechanics In Atomistic Systems
… onset of crack propagation. However, due to the discrete nature of the atomistic structures without stress singularity, there might be discrepancy between the failure prediction and the reality of nanostructured materials. Defining the local atomistic stress with convergence within one lattice …
-
Kongming : a generative planner for hybrid systems with temporally extended goals
… by a "script" that specifies a sequence of discrete commands and continuous actions. Currently such scripts are mostly hand-generated by human operators. This introduces inefficiency, puts a significant cognitive burden on the engineers, and prevents re-planning in response to environment …
-
Modeling and Estimation of Motion Over Manifolds with Motion Capture Data
Modeling the dynamics of complex multibody systems, such as those representing the motion of animals, can be accomplished through well-established geometric methods. In these formulations, motions take values in certain types of smooth manifolds which are coordinate-free and intrinsic. However, the …
-
Modeling of HIV, SIR and SIS epidemics on time scales and oscillation theory
<p>"We study higher dimensional systems of first order dynamic equations on time scales together with their applications. In particular, we focus on epidemic models such as HIV (Human Immunodeficiency Virus), SIS (Susceptible-Infected-Susceptible) and SIR (Susceptible-Infected-Recovered).</p> …
Page 1 of 2