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 23 for “"Log-normal Distribution"”.
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YSCAT Backscatter Distributions
… angle.</p> <p>A low wind speed "rolloff" of the normalized radar cross section (σ°) in YSCAT94 data is found and quantified. The rolloff wind speedΓ γΓ is estimated through regression estimation analysis using an Epanechnikov kernel. For YSCAT94 data, the rolloff is most noticeable at mid-range …
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Information technology and the rise of the power law economy
… a power law, as opposed to the long-established log-normal distribution. We present a simple theoretical model to argue that the increased role of power laws is consistent with the growth of information technology, because digitization and networks facilitate winner-take-most markets. We generate …
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On Laplace transforms, generalized gamma convolutions, and their applications in risk aggregation
… properties of the Laplace transform of the log-normal distribution. Two integral expressions for the analytic continuation of the Laplace transform of the log-normal distribution are provided, one of which takes the form of a Mellin-Barnes integral. As a corollary, we obtain an integral …
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Evaluation of Millimetre-wave Coherent Scattering from a Sea surface covered by Foam modelled as Sequences of Thin Phase-Scattering Screens using Split-Step Fourier Method
… randomly distributed air-bubbles that follow a log-normal distribution pattern. The log-normal distribution is a skewed distribu- tion with low geometric mean and large variance which can not be negative but cut-off at zero. The log-normal distribution is a good candidate for modelling random …
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Confidence estimation of the ratio of variances of two log-normal populations
… for the ratio of variances of two independent log-normal distributions. Extensive simula-tions were conducted to evaluate the performance of these CIs under varying sample sizes (10 to 350) and variance ratios, with one variance fixed at 0.1 and the other varying from 0.1 to 2.0. The impacts of …
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Diversity and MIMO for body-centric wireless communication channels
… The fast fading envelope best fits the Rician distribution, with moderate K-factor values, and the slow fading envelope best fits the Log-normal distribution. Diversity has been found effective in the BAN-BAN interference rejection and significant rejection gain values are achieved. A new …
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Effective properties for flow in heterogeneous porous media
… investigated via Monte Carlo method. Assuming log-normal distribution of conductivity and capillary pressure head being a stochastic process, the mean behavior model defined by effective properties was derived to predict the mean behavior of heterogeneous flows. Effective parameters were …
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Loss distributions in consumer credit risk : macroeconomic models for expected and unexpected loss
This thesis focuses on modelling the distributions of loss in consumer credit arrangements, both at an individual level and at a portfolio level, and how these might be influenced by loan-specific factors and economic factors. The thesis primarily aims to examine how these factors can be …
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Transport of copiotrophic bacteria in oligotrophic coarse soils: a Monte Carlo analysis
… using a procedure known to produce either a normal or log-normal distribution of random numbers. Numerous computer simulation runs were completed for hypothetical sandy and loamy sand soils subjected to a 10 year and 100 year rain storm. The resulting output was used to generate cumulative …
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DISTRIBUTED ENERGETICS OF BOREAL FOREST SNOWMELT
… structure on the snow cover depletionrate. The distribution of snow water equivalent was examined prior to melt and during melt in five distinct boreal forest environments, and the distribution of melt rate was quantified for each environment. The frequency distribution of snow water equivalent …
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Structure Function Relation of Porous 2D Material via SGCMC Simulation and Statistical Models
… placing circular pores with radii drawn from a log-normal distribution until we reach the target porosity and run our SGCMC simulations on the generated samples to create a data set to train our statistical models. We defined several parameters, including the two-point correlation function, the …
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Understanding low-penetrance genetic risk for breast cancer
… it is has been shown that when combined under a log-additive model they provide a modest level of risk discrimination in European populations. Genotyping for 18 of these loci was carried out in 2,301 Scottish women (870 women with breast cancer, 385 women with a strong family history and 1046 …
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Effects of prolonged mitosis on neural stem cells in vivo during development
… with a brain size >3 standard deviations below normal and have mild to severe cognitive deficits. 12 microcephaly-linked genes identified in human genetics studies encode microtubule/centrosome-associated proteins and mutations in these genes are strongly tied to disrupted mitotic processes in …
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Technology Agnostic Analysis and Design for Improved Performance, Variability, and Reliability in Thin Film Photovoltaics
… and can enable novel applications of PV technology. Their large scale adoption however, requires significant improvements in process yield, and operational reliability. In order to address these challenges, comprehensive understanding of factors affecting panel yield, and predictive models of …
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Studying the effect of Cu microstructure on electromigration reliability using statistical simulation
… and grain boundaries are determined by crystallographic orientation. Diffusion discontinuities can create flux divergent sites that control void growth kinetics and failure characteristics. Most of the earlier studies of EM modeling have assumed an averaged diffusivity measured across the …
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Three-dimensional modelling of metal evaporated tape
… columns which are tilted towards the film normal. The morphology of the film influences the magnetic behaviour and a 3D model is developed in this thesis to represent the columnar structure and the granular nature of ME tape. A Monte Carlo algorithm, consisting of a 'move and grow' …
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An empirical analysis and stochastic modelling of aggregate demand behaviour in a spare parts inventory system
… who showed that inventory usage values are often log normally distributed, we set out and developed models that go some considerable way to explaining the underlying stochastic basis for this phenomena, why it occurs and some limiting conditions. The justification for this approach was on the …
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Resource Allocation and Adaptive Antennas in Cellular Communications
The rapid growth in demand for cellular mobile communications and emerging fixed wireless access has created the need to increase system capacity through more efficient utilization of the frequency spectrum, and the need for better grade of service. In cellular systems, capacity improvement can be …
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Multiphase flow modeling and deposition of hydrates in oil and gas pipelines
… parameters like number of slugs, slug length distribution and slug frequency. Two-phase flow simulation results for the Caratinga field using CSMFlow were compared with OLGA®, where the prediction of the number of slugs was similar for both models, but the Log-Normal distribution for the slug …
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Microstructure evolution and interconnect realiability
… (EM) induced interconnect failure, normal grain growth in thin films was studied, analytic models were built for the grain structure statistics in 2D and 3D interconnects, and simulation programs were developed for generation of process and complex-geometry-sensitive interconnect …
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