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 29 for “"Multifractal"”.
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Multifractal Complexity of Hippocampal Memory Processing
… learning, memory and plasticity with fractal and multifractal complexity of interspike interval sequences recorded during numerous cognitive and behavioral conditions.
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Multifractal analysis of memory usage patterns
… and that computer memory use does indeed display multifractal behavior. In addition, it is hypothesized that this multifractal behavior may be useful in making certain predictions about the future behavior of an operating system.
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Stochastic flow and transport through multifractal porous media
… conductivity K is an isotropic lognormal multifractal field. Unlike the perturbation approach, results obtained are nonlinear even though several simplifying assumptions are made. The spectral density of F = in (K) for this type of field is SF (k) o kl-D where D is the space dimension. It …
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The Areal Reduction Factor (ARF) : a multifractal analysis
… space-time rainfall is exactly or approximately multifractal. We do so for various shapes of the rainfall collecting region and for Vad = 0 and Vad [not equal to] 0. When Vad = 0, a key parameter in the analysis is the ratio Ures = Vres/Ve between the "response velocity" Vres = L/D, where L is …
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Short-term rainfall prediction using a multifractal model
This study develops a method to predict multifractal measure of temporal rainfall intensity by using Kalman filter, and gives some examples of prediction for generated rainfall. The model for the rainfall generation proposed here is established using a continuous-time, discrete-scale lognormal …
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Multifractal Analysis of Geomagnetically Induced Currents using Wavelet Leaders
… 2003. Specifically, we perform a wavelet leader multifractal analysis of these current signals to generate singularity spectra, and then using the bootstrapping technique, we apply statistical tests to show that these signals exhibit multifractal characteristics. We also performed surrogate …
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Oceanic Rain Identification Using Multifractal Analysis Of Quikscat Sigma-0
The presence of rain over oceans interferes with the measurement of sea surface wind speed and direction from the Sea Winds scatterometer and as a result wind measurements contain biases in rain regions. In past research at the Central Florida Remote Sensing Lab, it has been observed that rain has …
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Multifractal analysis of heart rate variability using wavelet-transform modulus-maxima method
… conditions, the heart rate time series shows multifractal behavior. In contrast, HRV in the pathological state such as congestive heart failure exhibits more monofractal-like structure. Recent advances in the assessment of heart rate variability (HRV) uses a nonlinear dynamics approach. In …
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Analysis and Modelling of Financial Logarithmic Return Data using Multifractal and Agent-Based Techniques
… the stylised facts of financial data. I then use Multifractal Detrended Fluctuation Analysis to study the empirical log returns for multifractal scaling. I find that extreme events are inimical to the scaling in highly leptokurtic data. I also find that the temporal correlations in the data are …
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Fractal and Multifractal Analysis of Runoff Time Series and Stream Networks in Agricultural Watersheds
… reported. In the present study, fractal and multifractal scaling of daily runoff rate in four experimental agricultural watersheds and their associated sub-watersheds (32 in total) were investigated. The time series of daily runoff rate were obtained from the database (comprising about 16,600 …
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Optoelectronic Multifractal Wavelet Analysis for Fast and Accurate Detection of Rainfall in Weather Radar Images
… detection of rainfall. The process employs multifractal analysis using directional Gabor wavelets for accurate detection of the rain events. An optoelectronic joint transform correlator is proposed to provide ultra fast processing and wavelet analysis. Computer simulations of the proposed …
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WAVELET-BASED NETWORK TRAFFIC MODELING
… the Norros traffic model was proposed. Recently, multifractal characteristics of network traffic have been discovered and wavelet-based models have been proposed to capture these characteristics. Before adopting wavelet models, their strengths and weaknesses have to be studied. The wavelet models …
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Quantification of long-range power law correlations among healthy and pathologic subjects using detrended fluctuation analysis and multifractal detrended fluctuation analysis
… namely Detrended Fluctuation Analysis (DFA) and Multifractal (MF) DFA are used for the quantification of this correlation property in non-stationary physiological time series and it revealed the presence of long-range power law correlation for the group of healthy subjects while breakdown in the …
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Aplicación de técnicas de análisis multifractal a distribuciones de tamaño-volumen de partículas de suelo obtenidas mediante análisis por difracción de láser
… la aplicación de diversas técnicas de análisis multifractal a distribuciones de tamaños de partículas que han sido obtenidas a partir del análisis por difracción de láser de distintas muestras de suelo. Con ello se pretende comprobar la naturaleza multifractal de este tipo de distribuciones, así …
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Essays on the applications of distributional scaling in finance: Estimation, forecasting and inference
… current gaps in the literature on unifractal and multifractal processes in finance, through a combination of empirical and theoretical contributions spanning the key problems of estimation, forecasting and inference. In Chapter 2 a new method is proposed for producing density forecasts for daily …
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Quantization Dimension for Probability Definitions
… the theory of thermodynamic formalism and the multifractal spectrum. It is shown that at least in certain cases the quantization dimension function D(r)=Dr is a transform of the temperature function b(q), which is already known to be the Legendre transform of the multifractal spectrum f(a). …
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Aperiodic Order and Singular Spectra
… defined product systems. Finally we perform a multifractal analysis of a particular spectral measure that has become known as the Thue--Morse measure.
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Modelado y análisis de movimientos oculares : aplicación al estudio del proceso de lectura
… En segundo lugar, se introduce el análisis "multifractal detrended fluctuation analysis"(MF-DFA) para es- timar el espectro multifractal de series temporales biomédicas, aplicándolo al análisis de señales de eye tracking. Se definen parámetros que caracterizan la dinámica de las series …
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Fractal Dimensions in Classical and Quantum Mechanical Open Chaotic Systems
… around basins of attraction, or of fractal and multifractal distributions of asymptotic measures in open systems. In this thesis we study fractal and multifractal measure distributions in leaky Hamiltonian systems. Leaky systems are created by introducing a fully or partially transparent hole in …
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Effect of internal solitary waves on mine detection in the western Philippine Sea east of Taiwan
… does not change the basic characteristics of the multifractal structure. However, the IS changes the power exponent of the power spectra drastically, especially in the low wave number domain. It breaks down the power law of the structure function and increases the intermittency parameter. The …
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