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.
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Showing 1 to 20 of 359 for “"controllability"”.
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Controllability, Observability and Realizability
… concepts of the control theory, including controllability, observability and realizability. In particular, we analyze the theory of and solutions to linear time systems, continuous and discrete time systems, time-varying systems, and first-order matrix Sylvester systems. Examples and sample …
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Controllability and its effect on psychological functioning
… functions involved in psychopathology. Controllability over various aversive stimuli was manipulated in healthy student participants. Studies 1 and 2 explored the impact of controllability on autobiographical memory. Study 1 found that lacking perceived control led to the retrieval of …
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Structural controllability of driftless bilinear control systems
This thesis addresses the structural controllability of driftless bilinear systems with sparse matrices. We begin with a rigorous introduction to the controllability of nonholonomic nonlinear systems. We present the notion of structural controllability and the fact that the controllability of …
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Controllability of Non-Newtonian fluids under homogeneous flows
… material. This thesis investigates the controllability of three popular constitutive models under homogeneous extensional and shear flows via the Lie bracket method. The constitutive models are as follows: the Phan-Thien-Tanner model; the Johnson-Segalman model; and the Doi model. The …
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On stability and controllability of conjunctive Boolean networks
… of the CBN. We then investigate the orbit-controllability and state-controllability of a CBN. We ask the question of how one can steer a CBN to enter any periodic orbit or to reach any final state, from any initial state. Suppose that there is a selected subset of variables whose values can …
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Feedback Control and Nonlinear Controllability of Nonholonomic Systems
… vehicle: a nonholonomic system. The nonlinear controllability issues for the system are also studied. For the design of feedback controllers, the system is transformed into chained and power forms. The methods of transforming a nonholonomic system into these forms are discussed. The work …
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Controllability of quasilinear parabolic equations and Ladyzhenskaya-Boussinesq models
Neste presente trabalho, estudamos diferentes tipos de controle em dois modelos interes- santes, tanto teóricos quanto aplicados. No capítulo 2, estudaremos a existência de equilíbrios de Nash para a equação do calor com coeficiente de viscosidade dependendo do estado; também realizamos a parte …
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Association of Controllability, Depression, and Symptoms in Fibromyalgia Patients
<p>This study attempted to understand the role of controllability and learned helplessness in the experience of Fibromyalgia (FMS) patients. The study was crosssectional and correlational and examined the relationships between controllability, learned helplessness, depression, and somatic/retarded …
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Parental attributions concerning the causes and controllability of adolescent depression
… dimensions: the etiology of the disorder and the controllability of the symptoms. This study included 154 parents of adolescents who filled out an online survey. Participants were predominantly female and identified themselves as White/non-Hispanic. Among the teens, each gender was relatively …
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Determining the likelihood of un-controllability in large scale systems
… dynamic interconnections. In the literature, the controllability of these systems has been addressed under the leaderfollower framework, where some nodes are designated to be followers and the trajectories of the followers are controlled by the leader's trajectory. Graphic tools, in particular, …
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Controllability of Open Quantum Optical Systems: Photon Fock States in a Cavity
… to control quantum phenomena. A major barrier to controllability of quantum optical systems is the fact that the systems are usually innite dimensional open systems, two cases which have mostly negative controllability results. This thesis develops three new definitions of controllability and …
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The Relative Degree of Controllability of Solar Sails in Artificial Lagrangian Orbits
The problem of orbital controllability of solar sails in artificial Lagrangian orbits (ALOs) has received little attention from academics in the field of control. As a result, an important property for missions involving ALOs has not yet been investigated; namely, the degree of controllability …
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Factors Influencing a Battered Woman's Perception of Controllability in Violent Intimate Relationships
… helplessness on battered women's perception of controllability of violence in intimate relationships. The theoretical model explained factors influencing perception of controllability of violence. An examination of the study results by hypothesis indicated that three of the four research …
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Controllability and Observability of a Large Scale Thermodynamical System via Connectability Approach
… study presents a new approach to determine the controllability and observability of a large scale nonlinear dynamic thermal system using graph-theory. The novelty of this method is in adapting graph theory for nonlinear class and establishing a graphic condition that describes the necessary and …
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Assessing multi-rotor UAV controllability in low altitude fine-scale wind fields
This study presents a means of assessing unmanned aerial vehicle (UAV) control in various environments using control margin. The metric gives an instantaneous measure of control authority and is defined by dividing required torque by maximum available torque. Required torque is the sum total of …
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Boundary Controllability and Stabilizability of Nonlinear Schrodinger Equation in a Finite Interval
… equal 1 or -1. Moreover, the numerical study of controllability problem for the nonlinear Schrodinger equations is given. It is proved that the finite-difference scheme for the linear Schrodinger equation is uniformly boundary controllable and the boundary controls converge as the step sizes …
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A study of the controllability of air movements in predominantly naturally ventilated houses.
The aim of this study is to measure interzonal airflows through different doorway openings, due to the effects of temperature difference and combined temperature and pressure difference. The method of measurement uses tracer gases which are injected into spaces and their growths and decays are …
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Optimizing diesel engine efficiency using the controllability of a variable ratio hydrostatic transmission
"A linear mathematical model of a diesel engine, hydrostatic transmission, and electric dynamometer system was developed. This model was used as an aid in designing a single input controller which regulates engine speed to optimize efficiency while maintaining constant transmission output speed …
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Some Controllability and Stabilization Problems of Surface Waves on Water with Surface tension
The thesis consists of two parts. The first part discusses the initial value problem of a fifth-order Korteweg-de Vries type of equation w<sub>t</sub> + w<sub>xxx</sub> - w<sub>xxxxx</sub> - <sup>n</sup>∑<sub>j=1</sub> a<sub>j</sub>w<sup>j</sup>w<sub>x</sub> = 0, w(x, 0) = w<sub>0</sub>(x) posed on …
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