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 109 for “"attractor"”.
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Inferring central motor plans from attractor trajectory measurements
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1994.
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The distance to the Norma cluster and its relation to the great attractor region
… mass overdensity, particularly in the Great Attractor region and the more distant Shapley Supercluster, remain contradictory. This work is an attempt to disentangle these contributions by measuring a redshift-independent distance to the Norma cluster, which lies at, or close to, the core of …
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Application of Uncertainty Inequalities to Bound the Radius of the Attractor for the Kuramoto -Sivashinsky Equation
Made available in DSpace on 2015-09-28T15:19:58Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3250245.pdf: 2544352 bytes, checksum: 11ab9c7e28e1b2b45fc82c5713d9e645 (MD5) Previous issue date: 2006
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Implementation of a line attractor-based model of the gaze holding integrator using nonlinear spiking neuron models
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Altered Hemodynamic Control in the Skeletal Muscle Microcirculation in the Metabolic Syndrome: The Emergence of a new Attractor
Peripheral vascular disease is a pathological disease state whereby the peripheral vascular system becomes progressively limited in its ability to adequately perfuse extremities despite increases in metabolic demand. One of the primary risk factors for development of peripheral disease is the …
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Strange Attractors of Uniform Flows (Cantor Set, Solenoid)
Consider orbitally stable attractors of those flows on the open solid torus D('2) x S('1) which have uniform velocity in the S('1) direction (uniform flows). It was found that any such attractor is the frontier of a strictly nested sequence of positively invariant open solid tori. Necessary and …
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Systems evolution: the conceptual framework and a formal model
… can be defined and described as an emergent attractor. To maintain the wholeness in a changing environment, an open system may undergo radical changes both in its structure and function. The process of change is what is called of systems evolution. On reviewing the existing theories of …
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Error behavior and optimal discretization of chaotic differential equations
… spin-up error before the system reaches the attractor (i.e. the stationary distribution of long-run states) and sampling error due to finite-time averaging of trajectories on the attractor. In this work, we first propose an error model to describe the expected absolute errors on the attractor …
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Application of Bifurcation Theory to Subsynchronous Resonance in Power Systems
… subsynchronously with a small limit-cycle attractor. As the compensation level increases, the limit cycle grows and then loses stability via a secondary Hopf bifurcation, resulting in the creation of a two-period quasiperiodic subsynchronous oscillation, a two-torus attractor. On further …
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Development of new analytical techniques for chaotic time series
… dynamical systems: the Hénon map, the Lorenz attractor, the Rössler attractor and the Mackey-Glass attractor. These four systems are widely used as references in the scientific literature. In the last part of the work, we have started to examine EEG recordings by using the techniques …
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Understanding computation through low-dimensional dynamics with recurrent neural networks
… networks that implement variations of a ring attractor, a classic model of representation in neural circuits. The first variation produces a specific drift-diffusion process over the attractor, similar to that proposed in a working memory model. As a second variation, I introduce an input that …
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Relaxation and Spontaneous Ordering in Systems with Competition
… to perturbation. 2) The features of a rich attractor space in a system of repulsively coupled Kuramoto oscillators. In the first part, we address this question: how does a complex coarsening system with non-trivial in-domain dynamics respond to perturbations? We choose a cyclic predator-prey …
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Box approximation and related techniques in spectral theory
… interval. In the second chapter, we study the attractor of the dynamical system r [arrow] Ar, where Ar is the truncated Wiener-Hopf operator surrounded by operators of multiplication by the function e[superscript alpha/2] [absolute value of dot], [alpha][greater than] 0. We show that in the …
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Techniques to account for and reduce model inadequacy in ensemble-based filters
… error structure is the sensitivity of the local attractor to the parameter. The Multimodel Method (MMM) and Parametric Vector Method (PVM) to estimate this state-dependent sensitivity are introduced and investigated in the low-dimensional Ikeda and L63 systems. The MMM involves assimilating data …
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Reduced-space Gaussian process regression forecast for nonlinear dynamical systems
… and their uncertainty. For regions of the attractor where the training data points are not sufficiently dense for GPR to be effective an adaptive blended scheme is formulated that guarantees correct statistical steady state properties. We examine the effectiveness of the proposed method to …
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Model-based control of spatially extended systems
… driving needed to make the goal dynamics an attractor for the system, alleviating the need for constant feedback, as is necessary with traditional control methods.
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Neurocomputational Methods for Autonomous Cognitive Control
… learning, neural regions that each serve as an attractor network able to learn sequences, and neural regions that not only learn to exchange information but also to modulate the functions of other regions. The resultant networks have behaviors based on their own memory contents rather than …
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Towards a theory for the emergence of grid and place cell codes
… perform a hard navigation task suggests that the attractor dynamics forbids a network to simultaneously possess online learnability and high coding capacity. Because of this dynamical constraint in learning, a grid cell circuit has to be hardwired through some developmental process and cannot be …
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