+publisher:"University of Saskatchewan" +contributor:("Spiteri, Raymond")

1. Marsh, Chris B 1987-. Multi-Scale Modelling of Cold Regions Hydrology.

Degree: 2019, University of Saskatchewan

► Numerical computer simulations are increasingly important tools required to address both research and operational water resource issues related to the hydrological cycle. Cold region hydrological… (more)

▼ Numerical computer simulations are increasingly important tools required to address both research and operational water resource issues related to the hydrological cycle. Cold region hydrological models have requirements to calculate phase change in water via consideration of the energy balance which has high spatial variability. This motivates the inclusion of explicit spatial heterogeneity and field-testable process representations in such models. However, standard techniques for spatial representation such as raster discretization can lead to prohibitively large computational costs and increased uncertainty due to increased degrees of freedom. As well, semi-distributed approaches may not sufficiently represent all the spatial variability. Further, there is uncertainty regarding which process conceptualizations are used and the degree of required complexity, motivating modelling approaches that allow testing multiple working hypotheses. This thesis considers two themes. In the first, the development of improved modelling techniques to efficiently include spatial heterogeneity, investigate warranted model complexity, and appropriate process representation in cold region models is addressed. In the second, the issues of non-linear process cascades, emergence, and compensatory behaviours in cold regions hydrological process representations is addressed. To address these themes, a new modelling framework, the Canadian Hydrological Model (CHM), is presented. Key design goals for CHM include the ability to: capture spatial heterogeneity in an efficient manner, include multiple process representations, be able to change, remove, and decouple hydrological process algorithms, work both at point and spatially distributed scales, reduce computational overhead to facilitate uncertainty analysis, scale over multiple spatial extents, and utilize a variety of boundary and initial conditions. To enable multi-scale modelling in CHM, a novel multi-objective unstructured mesh generation software *mesher* is presented. Mesher represents the landscape using a multi-scale, variable resolution surface mesh. It was found that this explicitly captured the spatial heterogeneity important for emergent behaviours and cold regions processes, and reduced the total number of computational elements by 50% to 90% from that of a uniform mesh. Four energy balance snowpack models of varying complexity and degree of coupling of the energy and mass budget were used to simulate SWE in a forest clearing in the Canadian Rocky Mountains. It was found that 1) a compensatory response was present in the fully coupled models’ energy and mass balance that reduced their sensitivity to errors in meteorology and albedo and 2) the weakly coupled models produced less accurate simulations and were more sensitive to errors in forcing meteorology and albedo. The results suggest that the inclusion of a fully coupled mass and energy budget improves prediction of snow accumulation and ablation, but there was little advantage by introducing a multi-layered snowpack… Advisors/Committee Members: de Boer, Dirk, Spiteri, Raymond, Helgason, Warren, Spence, Chris.

Subjects/Keywords: hydrology; cold regions; numerical modelling; blowing snow; snow; cryosphere

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APA (6^th Edition):

Marsh, C. B. 1. (2019). Multi-Scale Modelling of Cold Regions Hydrology. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12388

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Marsh, Chris B 1987-. “Multi-Scale Modelling of Cold Regions Hydrology.” 2019. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/12388.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Marsh, Chris B 1987-. “Multi-Scale Modelling of Cold Regions Hydrology.” 2019. Web. 11 Apr 2021.

Vancouver:

Marsh CB1. Multi-Scale Modelling of Cold Regions Hydrology. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/12388.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Marsh CB1. Multi-Scale Modelling of Cold Regions Hydrology. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12388

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

2. Oraji, Rahim. A Machine Learning Generalization of LSI-OR.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/7318

► The Level of Service Inventory-Ontario Revision (LSI-OR) is used as a risk/need assessment tool to classify, manage, and treat the offender population so that they… (more)

▼ The Level of Service Inventory-Ontario Revision (LSI-OR) is used as a risk/need assessment tool to classify, manage, and treat the offender population so that they receive supportive services consistent with their custodial needs. This thesis adopts a machine learning approach employing the Naive Bayes technique as an alternative to the LSI-OR. The study was conducted on a group of (72725) offenders with different races and includes males (82.62%) and females (17.38%). Participants were monitored for two years to collect recidivism information. A basic analysis of the dataset revealed that 1) 83.18% of population used a unique pattern to answer 43 LSI-OR items, 2) the total LSI-OR scores in the entire population and also in male and female population followed two beta distribution functions, one for each recidivism class, and 3) the recidivism rate was approximated by a normal distribution function. It was shown that the Naive Bayes classifier can be considered as an extended LSI-OR classifier that accepts multiple continuous and discrete features as input. In other words, the Naive Bayes classifier provides a simple framework for studying the effect of distinct features on classification efficiency and accuracy. The results of running the Naive Bayes classifier with various input features revealed that the Naive Bayes classifier presented better performance than the LSI-OR. However, there was no obvious trend in the accuracies predicted by both models to indicate the superiority of one model over the other. The only feature whose value could be treated as a continuous variable was the LSI-OR score. Many models were created based on continuous and discrete LSI-OR scores producing either the same performance and mean accuracy or slightly better. The dataset contained many features that are never used by the LSI-OR assessment for instance, the offence severity. A model was built at each index of offence severity based on LSI-OR scores and 43 LSI-OR items as input features. The results of running the experiment indicate that considering 43 LSI-OR items gives more stable results in terms of accuracy than the LSI-OR scores. Advisors/Committee Members: Spiteri, Raymond, Eramian, Mark, Stanley, Kevin, Mago, Vijay.

Subjects/Keywords: LSI-OR; Naive Bayes; machine learning; level of service inventory; classifier; algorithm

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APA (6^th Edition):

Oraji, R. (2016). A Machine Learning Generalization of LSI-OR. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7318

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Oraji, Rahim. “A Machine Learning Generalization of LSI-OR.” 2016. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/7318.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Oraji, Rahim. “A Machine Learning Generalization of LSI-OR.” 2016. Web. 11 Apr 2021.

Vancouver:

Oraji R. A Machine Learning Generalization of LSI-OR. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/7318.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Oraji R. A Machine Learning Generalization of LSI-OR. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/7318

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

3. Guo, Qi 1993-. Logistic Operator Equation and the Induced Stochastic Process for Complex System Modelling.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/11224

► The logistic operator equation (LOE) is a type of a multidimensional system of nonlinear ordinary differential equations developed from the classical logistic equation (LE), which… (more)

Subjects/Keywords: Complex networks; Operator equation; Stochastic process; Simulation

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APA (6^th Edition):

Guo, Q. 1. (2018). Logistic Operator Equation and the Induced Stochastic Process for Complex System Modelling. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/11224

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Guo, Qi 1993-. “Logistic Operator Equation and the Induced Stochastic Process for Complex System Modelling.” 2018. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/11224.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Guo, Qi 1993-. “Logistic Operator Equation and the Induced Stochastic Process for Complex System Modelling.” 2018. Web. 11 Apr 2021.

Vancouver:

Guo Q1. Logistic Operator Equation and the Induced Stochastic Process for Complex System Modelling. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/11224.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Guo Q1. Logistic Operator Equation and the Induced Stochastic Process for Complex System Modelling. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/11224

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

4. Marsh, Megan. An assessment of numerical methods for cardiac simulation.

Degree: 2012, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2012-01-295

► Solving the mathematical models of the electrical activity in the heart is difficult mainly due to the complexity of the models required to capture the… (more)

▼ Solving the mathematical models of the electrical activity in the heart is difficult mainly due to the complexity of the models required to capture the electrochemical details of the organ. A variety of mathematical models has been developed to describe the electrical activity of individual heart cells. Cardiac cells respond to an electrical stimulus, causing ions to flow across the cell membrane, changing the electrical potential difference between the interior and the exterior of the cell. Cardiac cell models describe the potential difference across the cell membrane, and depending on the complexity of the model, the ion concentrations and the movement of ions through the cell membrane. This thesis studies 37 cardiac cell models and compares the efficiency of the Forward Euler and Rush-Larsen methods, as well as two generalized Rush-Larsen methods (of order one and order two). The Backward Euler method is compared for six of the 37 models and type-insensitive methods are compared for four of the 37 models. From the results, it is determined that the Rush-Larsen method is the most efficient for moderately stiff models and that the generalized Rush-Larsen methods perform well on the stiff models. The type-insensitive methods are more efficient than the single methods for each of the four models considered. The bidomain model combines a cardiac cell model with two partial differential equations that model the propagation of the electrical activity throughout the entire heart. Simulations of the bidomain model are computationally expensive, necessitating improvements to the numerical methods used to solve the model. In order to determine whether the cell model results can be applied to the bidomain model, a one-dimensional simulation of the bidomain model is considered and solved using the Chaste software package developed by the Computational Biology Group at Oxford University Computing Laboratory, together with additions written for this thesis. The cellular electrical activity within the bidomain model is modelled by eight of the 37 cell models previously studied, chosen to represent a range of the available models. From these results, it is shown that the cell model results are directly applicable to the one-dimensional bidomain problem. The first-order generalized Rush-Larsen method drastically reduces computation time for the two stiffest models, and the Rush-Larsen method performs optimally for the moderately stiff models. One of the de facto standards, the Forward Euler method, is shown to perform poorly for seven of the eight one-dimensional bidomain simulations. Advisors/Committee Members: Spiteri, Raymond J., Patrick, George W., Soteros, Chris.

Subjects/Keywords: Heart simulation; efficient numerical methods; stiffness; ordinary differential equations; bidomain model; partial differential equations; simulation of electrophysiological models

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Marsh, M. (2012). An assessment of numerical methods for cardiac simulation. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2012-01-295

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Marsh, Megan. “An assessment of numerical methods for cardiac simulation.” 2012. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/ETD-2012-01-295.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Marsh, Megan. “An assessment of numerical methods for cardiac simulation.” 2012. Web. 11 Apr 2021.

Vancouver:

Marsh M. An assessment of numerical methods for cardiac simulation. [Internet] [Thesis]. University of Saskatchewan; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/ETD-2012-01-295.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Marsh M. An assessment of numerical methods for cardiac simulation. [Thesis]. University of Saskatchewan; 2012. Available from: http://hdl.handle.net/10388/ETD-2012-01-295

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

5. Mara'Beh, Raed. Localized Spot Patterns for the Brusselator Reaction-Diffusion System.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2016-03-2524

► The Brusselator reaction-diffusion model characterizes dynamical processes of some reaction diffusion systems in chemistry, physics, biology, and geology. On the sphere, the solutions of the… (more)

Subjects/Keywords: Brusselator model; Reaction-diffusion model; Differential-Algebraic equations; Elliptic Fekete points; Particle swarm optimization.

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APA (6^th Edition):

Mara'Beh, R. (2016). Localized Spot Patterns for the Brusselator Reaction-Diffusion System. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2016-03-2524

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mara'Beh, Raed. “Localized Spot Patterns for the Brusselator Reaction-Diffusion System.” 2016. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/ETD-2016-03-2524.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mara'Beh, Raed. “Localized Spot Patterns for the Brusselator Reaction-Diffusion System.” 2016. Web. 11 Apr 2021.

Vancouver:

Mara'Beh R. Localized Spot Patterns for the Brusselator Reaction-Diffusion System. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/ETD-2016-03-2524.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mara'Beh R. Localized Spot Patterns for the Brusselator Reaction-Diffusion System. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/ETD-2016-03-2524

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

6. Kroshko, Andrew. Integrating-factor-based 2-additive Runge-Kutta methods for advection-reaction-diffusion equations.

Degree: 2011, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-05162011-111524

► There are three distinct processes that are predominant in models of flowing media with interacting components: advection, reaction, and diffusion. Collectively, these processes are typically… (more)

▼ There are three distinct processes that are predominant in models of flowing media with interacting components: advection, reaction, and diffusion. Collectively, these processes are typically modelled with partial differential equations (PDEs) known as advection-reaction-diffusion (ARD) equations. To solve most PDEs in practice, approximation methods known as numerical methods are used. The method of lines is used to approximate PDEs with systems of ordinary differential equations (ODEs) by a process known as semi-discretization. ODEs are more readily analysed and benefit from well-developed numerical methods and software. Each term of an ODE that corresponds to one of the processes of an ARD equation benefits from particular mathematical properties in a numerical method. These properties are often mutually exclusive for many basic numerical methods. A limitation to the widespread use of more complex numerical methods is that the development of the appropriate software to provide comparisons to existing numerical methods is not straightforward. Scientific and numerical software is often inflexible, motivating the development of a class of software known as problem-solving environments (PSEs). Many existing PSEs such as Matlab have solvers for ODEs and PDEs but lack specific features, beyond a scripting language, to readily experiment with novel or existing solution methods. The PSE developed during the course of this thesis solves ODEs known as initial-value problems, where only the initial state is fully known. The PSE is used to assess the performance of new numerical methods for ODEs that integrate each term of a semi-discretized ARD equation. This PSE is part of the PSE pythODE that uses object-oriented and software-engineering techniques to allow implementations of many existing and novel solution methods for ODEs with minimal effort spent on code modification and integration. The new numerical methods use a commutator-free exponential Runge-Kutta (CFERK) method to solve the advection term of an ARD equation. A matrix exponential is used as the exponential function, but CFERK methods can use other numerical methods that model the flowing medium. The reaction term is solved separately using an explicit Runge-Kutta method because solving it along with the diffusion term can result in stepsize restrictions and hence inefficiency. The diffusion term is solved using a Runge-Kutta-Chebyshev method that takes advantage of the spatially symmetric nature of the diffusion process to avoid stepsize restrictions from a property known as stiffness. The resulting methods, known as Integrating-factor-based 2-additive Runge-Kutta methods, are shown to be able to find higher-accuracy solutions in less computational time than competing methods for certain challenging semi-discretized ARD equations. This demonstrates the practical viability both of using CFERK methods for advection and a 3-splitting in general. Advisors/Committee Members: Spiteri, Raymond J., Kim, Theodore, Osgood, Nathaniel, MacDonald, Colin.

Subjects/Keywords: software engineering; differential equations; numerical analysis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kroshko, A. (2011). Integrating-factor-based 2-additive Runge-Kutta methods for advection-reaction-diffusion equations. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-05162011-111524

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kroshko, Andrew. “Integrating-factor-based 2-additive Runge-Kutta methods for advection-reaction-diffusion equations.” 2011. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/etd-05162011-111524.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kroshko, Andrew. “Integrating-factor-based 2-additive Runge-Kutta methods for advection-reaction-diffusion equations.” 2011. Web. 11 Apr 2021.

Vancouver:

Kroshko A. Integrating-factor-based 2-additive Runge-Kutta methods for advection-reaction-diffusion equations. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/etd-05162011-111524.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kroshko A. Integrating-factor-based 2-additive Runge-Kutta methods for advection-reaction-diffusion equations. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/etd-05162011-111524

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

7. Fehr, Lukas 1994-. Sensitivity Study on Canadian Air Quality Measurements from Geostationary Orbit.

Degree: 2020, University of Saskatchewan

URL: http://hdl.handle.net/10388/12572

► Tropospheric Emissions: Monitoring of Pollution (TEMPO) is a satellite-based remote sensing air quality instrument destined for geostationary orbit over North America beginning in 2022. TEMPO… (more)

Subjects/Keywords: Remote sensing; Air quality; Differential optical absorption spectroscopy; Nitrogen dioxide

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APA (6^th Edition):

Fehr, L. 1. (2020). Sensitivity Study on Canadian Air Quality Measurements from Geostationary Orbit. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12572

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fehr, Lukas 1994-. “Sensitivity Study on Canadian Air Quality Measurements from Geostationary Orbit.” 2020. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/12572.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fehr, Lukas 1994-. “Sensitivity Study on Canadian Air Quality Measurements from Geostationary Orbit.” 2020. Web. 11 Apr 2021.

Vancouver:

Fehr L1. Sensitivity Study on Canadian Air Quality Measurements from Geostationary Orbit. [Internet] [Thesis]. University of Saskatchewan; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/12572.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fehr L1. Sensitivity Study on Canadian Air Quality Measurements from Geostationary Orbit. [Thesis]. University of Saskatchewan; 2020. Available from: http://hdl.handle.net/10388/12572

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

8. Huang, Danny. Large Growth Deformations of Thin Tissue using Solid-Shells.

Degree: 2020, University of Saskatchewan

URL: http://hdl.handle.net/10388/13124

► Simulating large scale expansion of thin structures, such as in growing leaves, is challenging. Sold-shells have a number of potential advantages over conventional thin-shell methods,… (more)

Subjects/Keywords: Physics-Based Simulation; Finite Element Method; Growth; Solid-Shells; Diffusion; Adaptive Remeshing; Collision Handling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Huang, D. (2020). Large Growth Deformations of Thin Tissue using Solid-Shells. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/13124

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Huang, Danny. “Large Growth Deformations of Thin Tissue using Solid-Shells.” 2020. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/13124.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Huang, Danny. “Large Growth Deformations of Thin Tissue using Solid-Shells.” 2020. Web. 11 Apr 2021.

Vancouver:

Huang D. Large Growth Deformations of Thin Tissue using Solid-Shells. [Internet] [Thesis]. University of Saskatchewan; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/13124.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Huang D. Large Growth Deformations of Thin Tissue using Solid-Shells. [Thesis]. University of Saskatchewan; 2020. Available from: http://hdl.handle.net/10388/13124

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

9. MIRSHEKARI, ELHAM. Extending BACOLI to solve multi-scale problems.

Degree: 2014, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2014-09-1713

► The BACOLI package is a numerical software package for solving parabolic partial differential equations in one spatial dimension. It implements a B-spline collocation method for… (more)

▼ The BACOLI package is a numerical software package for solving parabolic partial differential equations in one spatial dimension. It implements a B-spline collocation method for the spatial discretization of a system of partial differential equations. The resultant ordinary differential equations together with the boundary conditions form a system of differential-algebraic equations. The differential-algebraic equations are then solved using the DASSL solver. The BACOLI software package features adaptive error control in the temporal and spatial domains. The estimate of the temporal error is controlled through the DASSL solver. The estimate of the spatial error is controlled based on the difference between two solutions computed in the BACOLI software package. This difference gives an estimation of the error. If this error estimate does not meet the user-supplied tolerance, then the spatial mesh is changed. The BACOLI software package can only solve parabolic partial differential equations that depend on spatial derivatives. In this thesis, the BACOLI software package is modified to solve a broader spectrum of problems. In fact, after some modifications, the extended BACOLI software package can solve systems of parabolic partial differential equations and time-dependent equations that do not depend on spatial derivatives. We apply this extended software package to solve the monodomain model of cardiac electrophysiology. The monodomain model is a multi-scale mathematical model for the evolution of the electrical potential in cardiac tissue that couples the ionic currents at the cellular scale with their propagation at the tissue scale. Because of their local nature, the mathematical models of a single cell have no dependency on spatial derivatives whereas the models at the tissue level do. The heart models considered in our numerical experiments use various cardiac cell models. We find that solving the heart models through the extended BACOLI software package, in some cases, leads to a speed-up in comparison with the Chaste software package, which is a powerful, widely used, and well-respected software package for heart simulation. Advisors/Committee Members: Spiteri, Raymond J., Bickis, Mik, Sowa, Artur, Patrick, George, Fairweather, Graeme.

Subjects/Keywords: BACOLI; mathematical modelling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

MIRSHEKARI, E. (2014). Extending BACOLI to solve multi-scale problems. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2014-09-1713

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

MIRSHEKARI, ELHAM. “Extending BACOLI to solve multi-scale problems.” 2014. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/ETD-2014-09-1713.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

MIRSHEKARI, ELHAM. “Extending BACOLI to solve multi-scale problems.” 2014. Web. 11 Apr 2021.

Vancouver:

MIRSHEKARI E. Extending BACOLI to solve multi-scale problems. [Internet] [Thesis]. University of Saskatchewan; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/ETD-2014-09-1713.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

MIRSHEKARI E. Extending BACOLI to solve multi-scale problems. [Thesis]. University of Saskatchewan; 2014. Available from: http://hdl.handle.net/10388/ETD-2014-09-1713

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

10. Bohaychuk, Kaylee S 1990-. Dynamic Measures of Arterial Stiffness in a Rodent Model.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/7453

► Cardiovascular disease is one of the leading causes of death in Canada. Arterial stiffness is an important factor in the pathogenesis of cardiovascular disease. Cardiac… (more)

▼ Cardiovascular disease is one of the leading causes of death in Canada. Arterial stiffness is an important factor in the pathogenesis of cardiovascular disease. Cardiac failure, hypertension, renal failure, and dementia have all been linked to arterial stiffness. The arterial system is designed to dampen the pulses of blood from the heart's left ventricle and distribute the blood forward as steady flow in the small vessels. The pulse-dampening ability of the arterial system is reduced with age when the elastic fibers in the arterial wall degrade and fracture. The arterial stiffening process can accelerate from deposition of minerals within the arterial wall, such as calcium, from the endothelial layer becoming compromised or from fibrosis secondary to inflammation or turbulence. Arterial stiffness can be assessed post-mortem by microscopic examination of the arterial wall. However, for use in dynamic experiments and for therapeutic intervention, several ante-mortem techniques have been developed: pulse wave velocity (PWV), pulse waveform analysis (PWA), wave separation analysis (WSA), and carotid ultrasonography. Rats are important models for cardiovascular disease, toxicology, and pharmacological studies because of their convenient size and short life cycle. However, PWA and WSA have not been shown to be valid approaches for studying arterial stiffness in rat peripheral arteries. In this thesis, dynamic in vivo methods for PWA and WSA in rat peripheral arteries were developed to provide accurate measures of arterial stiffness. Software specific to the rat vasculature, PWanalyze and WSanalyze, was developed to measure PWA and WSA parameters, respectively. A comparison of these PWA and WSA methods in rat peripheral arteries was performed by creating a range of arterial stiffnesses through acute and chronic experiments. Arterial stiffness was measured in the femoral artery by a novel PWA parameter, the minimum time derivative of blood pressure dp/dt(min), as effectively as the established parameter the maximum time derivative of blood pressure dp/dt(max). A new method of WSA in femoral arteries was developed. Backward wave amplitude measured in the aorta was shown to increase as arteries stiffened and decrease as arteries relaxed with acute vasoactive drug injections. These experiments showed that dp/dt(min) and WSA are valid approaches to use when studying arterial stiffness in rats. Advisors/Committee Members: Weber, Lynn, Spiteri, Raymond, Honaramooz, Ali, Duke-Novakovski, Tanya, McNair, Erick.

Subjects/Keywords: arterial stiffness; WSA; PWA; rodent; rat; dpdtmin; wave reflection

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APA (6^th Edition):

Bohaychuk, K. S. 1. (2016). Dynamic Measures of Arterial Stiffness in a Rodent Model. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7453

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bohaychuk, Kaylee S 1990-. “Dynamic Measures of Arterial Stiffness in a Rodent Model.” 2016. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/7453.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bohaychuk, Kaylee S 1990-. “Dynamic Measures of Arterial Stiffness in a Rodent Model.” 2016. Web. 11 Apr 2021.

Vancouver:

Bohaychuk KS1. Dynamic Measures of Arterial Stiffness in a Rodent Model. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/7453.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bohaychuk KS1. Dynamic Measures of Arterial Stiffness in a Rodent Model. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/7453

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

11. Ahmadi, Sheida 1982-. Diffusion In Highly Confined Channels: A Transition State Theory for Hopping.

Degree: 2019, University of Saskatchewan

URL: http://hdl.handle.net/10388/12318

► Brownian particles restricted to narrow, quasi-one dimensional channels exhibit a dynamic transition from single file diffusion (SFD) to normal diffusion for tracer particle diffusion as… (more)

▼ Brownian particles restricted to narrow, quasi-one dimensional channels exhibit a dynamic transition from single file diffusion (SFD) to normal diffusion for tracer particle diffusion as the channels' confinement becomes less severe and the pore diameter is wide enough for the particles to hop past each other. The dynamics of a tracer particle in the crossover regime can be described in terms of a hopping time, that measures the average time for a tagged particle to escape the cage formed by its immediate left and right neighbors. The hopping time contains all the details of the systems such as the density, particle-particle and particle-wall interactions and has a potential to lead to a better understanding of diffusion and the control of transport in confined single file fluids. The main goal of this thesis is to develop a Transition State Theory (TST) approach to the calculation of the hopping time in Single file fluids. The method rigorously transforms the process of a particle escaping its cage, in a many particle single- file system, into a problem involving two particles attempting to pass each other in a small system isobaric-isothermal ensemble. The validity of this approach is examined theoretically and computationally for a system of two-dimensional ideal gas particles and a two-dimensional hard disc system. The proposed method correctly predicts the hopping times for the full range of pore radii studied for the ideal gas system. For the case of hard discs, inclusion of the prefactor calculations is necessary, because of its dependency on the channels' diameter, and leads to a quantitative prediction of hopping time. To demonstrate the effect particle-particle interactions have on diffusion in single file fluids, the hopping time and TST barriers are calculated for a system of soft repulsive discs. The result shows the method overestimates the hopping time for the narrower channels and underestimates it for the wider channels, which could be related to the assumptions made in deriving the partition function for the system, and also the kinetic prefactor calculations. Nevertheless, the method resulted in a quantitative prediction of hopping times within a factor of two. It has previously shown that various components of a mixture may experience di fferent hopping barriers, leading to differences in tracer particle mobility. This thesis explores the possibility that enantiomers confined to a chiral channel exhibit different hopping times. The free energy barriers for the R- and S- enantiomers of Bromochlorofluoromethane, CHFClBr, inside carbon nanotubes are calculated using the TST isothermal-isobaric ensemble method, but are found to exhibit no difference. However, when the molecule, channel shapes, and interactions are modified to enhance the chiral interaction, the R- and S- enantiomers exhibit differences in their free energy barriers. In addition, reversing the chirality of the modified nanotube, reverses the relative heights of the barrier obtained for the two pairs of enantiomers, confirming that… Advisors/Committee Members: Bowles, Richard, Paige, Matthew, Spiteri, Raymond, Burgess, Ian, Kelly, Tim.

Subjects/Keywords: Single file system; single file diffusion; brownian particles; tracer particle; narrow channels; hopping time; diffusion coefficient; transition state theory; isobaric-isothermal ensemble; separation; enantiomers; hopping barrier; chirality; carbon nanotube

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APA (6^th Edition):

Ahmadi, S. 1. (2019). Diffusion In Highly Confined Channels: A Transition State Theory for Hopping. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12318

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ahmadi, Sheida 1982-. “Diffusion In Highly Confined Channels: A Transition State Theory for Hopping.” 2019. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/12318.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ahmadi, Sheida 1982-. “Diffusion In Highly Confined Channels: A Transition State Theory for Hopping.” 2019. Web. 11 Apr 2021.

Vancouver:

Ahmadi S1. Diffusion In Highly Confined Channels: A Transition State Theory for Hopping. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/12318.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ahmadi S1. Diffusion In Highly Confined Channels: A Transition State Theory for Hopping. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12318

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

12. Zhang, Hao. Single-Precision and Double-Precision Merged Floating-Point Multiplication and Addition Units on FPGA.

Degree: 2015, University of Saskatchewan

URL: http://hdl.handle.net/10388/12611

► Floating-point (FP) operations defined in IEEE 754-2008 Standard for Floating-Point Arithmetic can provide wider dynamic range and higher precision than fixed-point operations. Many scientific computations… (more)

▼ Floating-point (FP) operations defined in IEEE 754-2008 Standard for Floating-Point Arithmetic can provide wider dynamic range and higher precision than fixed-point operations. Many scientific computations and multimedia applications adopt FP operations. Among all the FP operations, addition and multiplication are the most frequent operations. In this thesis, the single-precision (SP) and double-precision (DP) merged FP multiplier and FP adder architectures are proposed. The proposed efficient iterative FP multiplier is designed based on the Karatsuba algorithm and implemented with the pipelined architecture. It can accomplish two parallel SP multiplication operations in one iteration with a latency of 6 clock cycles or one DP multiplication operation in two iterations with a latency of 9 clock cycles. Implemented on Xilinx Virtex-5 (xc5vlx155ff1760-3) FPGA device, the proposed multiplier runs at 348 MHz using 6 DSP48E blocks, 1117 LUTs, and 1370 FFs. Compared to previous FPGA based multiple-precision FP multiplier, the proposed designs runs at 4% faster clock frequency with reduction of 33% of DSP blocks, 17% latency for SP multiplication, and 28% latency for DP multiplication. The proposed high performance FP adder is designed based one the two-path FP addition algorithm. With fully pipelined architecture, the proposed adder can accomplish one DP or two parallel SP addition/subtraction operations in 6 clock cycles. The proposed adder architecture is implemented on both Altera and Xilinx 65nm process FPGA devices. The proposed adder can run up to 336 MHz with 1694 FFs, 1420 LUTs on Xilinx Virtex-5 (xc5vlx155ff1760-3) FPGA device. Compared to the combination of one DP and two SP architecture built with Xilinx FP operator, the proposed adder has 11.3% faster clock frequency. On Altera Stratix-III (EP3SL340F1760C2) FPGA device, the maximum clock frequency of the proposed adder can reach 358 MHz and 1686 ALUTs and 1556 registers are occupied. The proposed adder is 11.6% faster than the combination of one DP and two SP architecture built with Altera FP megafunction. For the reference of other researchers, the implementation results of the proposed FP multiplier and FP adder on the latest Xilinx Virtex-7 device and Altera Arria 10 device are also provided. Advisors/Committee Members: Ko, Seok-Bum, Spiteri, Raymond J, Chen, Li, Dinh, Anh V.

Subjects/Keywords: floating-point arithmetic; floating-point multiplier; floating-point adder; fpga design; Karatsuba algorithm

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, H. (2015). Single-Precision and Double-Precision Merged Floating-Point Multiplication and Addition Units on FPGA. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12611

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Hao. “Single-Precision and Double-Precision Merged Floating-Point Multiplication and Addition Units on FPGA.” 2015. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/12611.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Hao. “Single-Precision and Double-Precision Merged Floating-Point Multiplication and Addition Units on FPGA.” 2015. Web. 11 Apr 2021.

Vancouver:

Zhang H. Single-Precision and Double-Precision Merged Floating-Point Multiplication and Addition Units on FPGA. [Internet] [Thesis]. University of Saskatchewan; 2015. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/12611.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang H. Single-Precision and Double-Precision Merged Floating-Point Multiplication and Addition Units on FPGA. [Thesis]. University of Saskatchewan; 2015. Available from: http://hdl.handle.net/10388/12611

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

13. Loi, Kung Chi Cinnati 1985-. Hardware Implementations of Scalable and Unified Elliptic Curve Cryptosystem Processors.

Degree: 2015, University of Saskatchewan

URL: http://hdl.handle.net/10388/12649

► As the amount of information exchanged through the network grows, so does the demand for increased security over the transmission of this information. As the… (more)

▼ As the amount of information exchanged through the network grows, so does the demand for increased security over the transmission of this information. As the growth of computers increased in the past few decades, more sophisticated methods of cryptography have been developed. One method of transmitting data securely over the network is by using symmetric-key cryptography. However, a drawback of symmetric-key cryptography is the need to exchange the shared key securely. One of the solutions is to use public-key cryptography. One of the modern public-key cryptography algorithms is called Elliptic Curve Cryptography (ECC). The advantage of ECC over some older algorithms is the smaller number of key sizes to provide a similar level of security. As a result, implementations of ECC are much faster and consume fewer resources. In order to achieve better performance, ECC operations are often offloaded onto hardware to alleviate the workload from the servers' processors. The most important and complex operation in ECC schemes is the elliptic curve point multiplication (ECPM). This thesis explores the implementation of hardware accelerators that offload the ECPM operation to hardware. These processors are referred to as ECC processors, or simply ECPs. This thesis targets the efficient hardware implementation of ECPs specifically for the 15 elliptic curves recommended by the National Institute of Standards and Technology (NIST). The main contribution of this thesis is the implementation of highly efficient hardware for scalable and unified finite field arithmetic units that are used in the design of ECPs. In this thesis, scalability refers to the processor's ability to support multiple key sizes without the need to reconfigure the hardware. By doing so, the hardware does not need to be redesigned for the server to handle different levels of security. Unified refers to the ability of the ECP to handle both prime and binary fields. The resultant designs are valuable to the research community and industry, as a single hardware device is able to handle a wide range of ECC operations efficiently and at high speeds. Thus, improving the ability of network servers to handle secure transaction more quickly and improve productivity at lower costs. Advisors/Committee Members: Ko, Seok-Bum, Teng, Daniel, Bui, Francis, Spiteri, Raymond, Dimitrov, Vassil.

Subjects/Keywords: elliptic curve cryptography(ECC); finite field arithmetic, field programmable gate array (FPGA); hardware architecture; security; computer arithmetic; parallelization

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APA (6^th Edition):

Loi, K. C. C. 1. (2015). Hardware Implementations of Scalable and Unified Elliptic Curve Cryptosystem Processors. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12649

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Loi, Kung Chi Cinnati 1985-. “Hardware Implementations of Scalable and Unified Elliptic Curve Cryptosystem Processors.” 2015. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/12649.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Loi, Kung Chi Cinnati 1985-. “Hardware Implementations of Scalable and Unified Elliptic Curve Cryptosystem Processors.” 2015. Web. 11 Apr 2021.

Vancouver:

Loi KCC1. Hardware Implementations of Scalable and Unified Elliptic Curve Cryptosystem Processors. [Internet] [Thesis]. University of Saskatchewan; 2015. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/12649.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Loi KCC1. Hardware Implementations of Scalable and Unified Elliptic Curve Cryptosystem Processors. [Thesis]. University of Saskatchewan; 2015. Available from: http://hdl.handle.net/10388/12649

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

14. Zhuo, Zhihong. A Performance Comparison of VMware GPU Virtualization Techniques in Cloud Gaming.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2016-03-2460

► Cloud gaming is an application deployment scenario which runs an interactive gaming application remotely in a cloud according to the commands received from a thin… (more)

▼ Cloud gaming is an application deployment scenario which runs an interactive gaming application remotely in a cloud according to the commands received from a thin client and streams the scenes as a video sequence back to the client over the Internet, and it is of interest to both research community and industry. The academic community has developed some open-source cloud gaming systems such as GamingAnywhere for research study, while some industrial pioneers such as Onlive and Gaikai have succeeded in gaining a large user base in the cloud gaming market. Graphical Processing Unit (GPU) virtualization plays an important role in such an environment as it is a critical component that allows virtual machines to run 3D applications with performance guarantees. Currently, GPU pass-through and GPU sharing are the two main techniques of GPU virtualization. The former enables a single virtual machine to access a physical GPU directly and exclusively, while the latter makes a physical GPU shareable by multiple virtual machines. VMware Inc., one of the most popular virtualization solution vendors, has provided concrete implementations of GPU pass-through and GPU sharing. In particular, it provides a GPU pass-through solution called Virtual Dedicated Graphics Acceleration (vDGA) and a GPU-sharing solution called Virtual Shared Graphics Acceleration (vSGA). Moreover, VMware Inc. recently claimed it realized another GPU sharing solution called vGPU. Nevertheless, the feasibility and performance of these solutions in cloud gaming has not been studied yet. In this work, an experimental study is conducted to evaluate the feasibility and performance of GPU pass-through and GPU sharing solutions offered by VMware in cloud gaming scenarios. The primary results confirm that vDGA and vGPU techniques can fit the demands of cloud gaming. In particular, these two solutions achieved good performance in the tested graphics card benchmarks, and gained acceptable image quality and response delay for the tested games. Advisors/Committee Members: Makaroff, Dwight, Eager, Derek, Stanley, Kevin, Spiteri, Raymond J., Teng, Daniel.

Subjects/Keywords: Performance Study; GPU Virtualization; Cloud Gaming; VMware

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APA (6^th Edition):

Zhuo, Z. (2016). A Performance Comparison of VMware GPU Virtualization Techniques in Cloud Gaming. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2016-03-2460

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhuo, Zhihong. “A Performance Comparison of VMware GPU Virtualization Techniques in Cloud Gaming.” 2016. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/ETD-2016-03-2460.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhuo, Zhihong. “A Performance Comparison of VMware GPU Virtualization Techniques in Cloud Gaming.” 2016. Web. 11 Apr 2021.

Vancouver:

Zhuo Z. A Performance Comparison of VMware GPU Virtualization Techniques in Cloud Gaming. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/ETD-2016-03-2460.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhuo Z. A Performance Comparison of VMware GPU Virtualization Techniques in Cloud Gaming. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/ETD-2016-03-2460

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

15. Koshkarov, Oleksandr 1992-. Instabilities, anomalous transport, and nonlinear structures in partially and fully magnetized plasmas.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/8455

► Plasmas behavior, to a large extent, is determined by collective phenomena such as waves. Wave excitation, turbulence, and formation of quasi-coherent nonlinear structures are defining… (more)

▼ Plasmas behavior, to a large extent, is determined by collective phenomena such as waves. Wave excitation, turbulence, and formation of quasi-coherent nonlinear structures are defining features of nonlinear multi-scale plasma dynamics. In this thesis, instabilities, anomalous transport, and structures in partially and fully magnetized plasmas were studied with a combination of analytical and numerical tools. The phenomena studied in this thesis are of interest for many applications, e.g., plasma reactors for material processing, electric propulsion, magnetic plasma confinement, and space plasma physics. Large equilibrium flows of ions and electrons exist in many devices with partially magnetized plasmas in crossed electric and magnetic fields. Such flows result in various instabilities and turbulence that produce anomalous electron transport across the magnetic field. We present first principle, self-consistent, nonlinear fluid simulations that predict the level of anomalous current generally consistent with experimental data. We also show that drift waves in partially magnetized plasmas (which we called Hall drift waves), destabilized by the electron drift along with density gradients, tend to form (via inverse energy cascade) shear flows similar to zonal flows in fully magnetized plasmas. These flows become unstable due to a secondary instability (similar to Kelvin–Helmholtz instability) and produce large-scale quasi-stationary vortices. Then, it was shown that in nonlinear regimes, the axial mode instability due to electron and ion flows (along the electric field) forms large-amplitude cnoidal type waves. At the same time, the strong electric field produced by axial modes affects Hall drift waves stability and provides a feedback mechanism on density gradient driven turbulence, creating a complex picture of interacting anomalous transport, zonal flows, vortices, and streamers. In the case where axial modes are destabilized by boundary effects, the nonlinear dynamics result in a new nonlinear equilibrium or standing oscillating waves. The formation of shear flows (zonal flows) was also studied in the framework of the Hasegawa-Mima equation and it was established that zonal flows can saturate due to nonlinear self-interactions. Lastly, a novel approach for high-fidelity numerical simulations of multi-scale nonlinear plasma dynamics is developed which is illustrated with the example of an unmagnetized plasma. Advisors/Committee Members: Smolyakov, Andrei, Xiao, Chijin, St. Maurice, Jean-Pierre, Bradley, Michael, Spiteri, Raymond.

Subjects/Keywords: plasma instabilities; nonlinear waves; anomalous transport

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APA (6^th Edition):

Koshkarov, O. 1. (2018). Instabilities, anomalous transport, and nonlinear structures in partially and fully magnetized plasmas. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/8455

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Koshkarov, Oleksandr 1992-. “Instabilities, anomalous transport, and nonlinear structures in partially and fully magnetized plasmas.” 2018. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/8455.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Koshkarov, Oleksandr 1992-. “Instabilities, anomalous transport, and nonlinear structures in partially and fully magnetized plasmas.” 2018. Web. 11 Apr 2021.

Vancouver:

Koshkarov O1. Instabilities, anomalous transport, and nonlinear structures in partially and fully magnetized plasmas. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/8455.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Koshkarov O1. Instabilities, anomalous transport, and nonlinear structures in partially and fully magnetized plasmas. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/8455

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

16. Wang, Jackie. A New Iterative Method for Solving Nonlinear Equation.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/11960

► Nonlinear equations are known to be difficult to solve, and numerical methods are used to solve systems of nonlinear equations. The objective of this research… (more)

Subjects/Keywords: Iterative Method; Nonlinear Equations; Inverse Kinematics

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APA (6^th Edition):

Wang, J. (2018). A New Iterative Method for Solving Nonlinear Equation. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/11960

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Jackie. “A New Iterative Method for Solving Nonlinear Equation.” 2018. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/11960.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Jackie. “A New Iterative Method for Solving Nonlinear Equation.” 2018. Web. 11 Apr 2021.

Vancouver:

Wang J. A New Iterative Method for Solving Nonlinear Equation. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/11960.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang J. A New Iterative Method for Solving Nonlinear Equation. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/11960

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

17. Chakravarty, Rajat. Turbulent Flow Visualization over Surface-mounted Finite-height Cylinders and Square Prisms.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/11214

► The study of turbulent flows over surface-mounted, finite-height bluff bodies like cylinders and square prisms have various engineering and industrial applications. The flow field around… (more)

▼ The study of turbulent flows over surface-mounted, finite-height bluff bodies like cylinders and square prisms have various engineering and industrial applications. The flow field around and in the wake of these bodies is sufficiently complex due to the interactions of the ground plane boundary layer with the separating shear layers from the free end and the sides of these bodies. As such straightforward geometries produce large, complex wakes, there has been increased interest in the literature in the past few decades on examining this flow field experimentally. Recent advancements in computational power have also facilitated the numerical calculation of these flows at higher spatial and temporal resolutions, which were otherwise inestimable by experiments alone. However, the instantaneous flow field in the wake, and specifically above the free end, which is a major contributor to the three-dimensionality of this flow field, has not been well understood. Beyond numerical simulations or experiments, a modern challenge in turbulence research has been to identify and classify the instantaneous energetic structures ensconced in a turbulent flow field. Velocity gradient methods like the swirling strength criterion and the Q-criterion have successfully tendered a mathematical definition to isolate vortex structures embedded in turbulent flow. Another promising approach called proper orthogonal decomposition (POD) has also become popular in the past couple of decades, as it provides for a low-dimensional approximation of a high-dimensional turbulent flow field. Thus, the aim of this thesis is to pursue fundamental studies of the flow topologies above the free end of a surface-mounted cylinder and square prism, as well as in the wake of a surface-mounted square prism, to obtain insightful representations of these flow fields using enhanced post-processing methodologies like the swirling strength criterion, Q-criterion, and POD. The first manuscript (presented as Chapter 2) investigated the flow field obtained from Particle Image Velocimetry (PIV) above the free end of a surface-mounted finite square prism in the vertical symmetry plane at a Reynolds number of Re = 4.2x10⁴ for four different aspect ratios AR = 9, 7, 5 and 3. The POD methodology was able to capture the energetic flow features within a small number of energy modes. A qualitative analysis of the energy modes revealed a pair of shear sub-layers from the free end, as well as several vortex structures within these layers, likely evidence of Kelvin-Helmholtz (KH) instabilities. The swirling strength criterion was also used to find other structural features in the near-wake above and behind the free end, and the changes in the flow topologies with aspect ratio were demonstrated. The second manuscript (presented in Chapter 3) investigated the flow field obtained from PIV above a surface-mounted finite cylinder in several horizontal planes close to the free end and parallel to it, at a Reynolds number of Re = 4.2x10⁴ for four different aspect ratios AR = 9, 7, 5… Advisors/Committee Members: Bergstrom, Donald J, Sumner, David, Bugg, james, Wu, FanXiang, Spiteri, Raymond, Noble, Scott.

Subjects/Keywords: turbulence; proper orthogonal decomposition; square prism; cylinder

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APA (6^th Edition):

Chakravarty, R. (2018). Turbulent Flow Visualization over Surface-mounted Finite-height Cylinders and Square Prisms. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/11214

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chakravarty, Rajat. “Turbulent Flow Visualization over Surface-mounted Finite-height Cylinders and Square Prisms.” 2018. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/11214.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chakravarty, Rajat. “Turbulent Flow Visualization over Surface-mounted Finite-height Cylinders and Square Prisms.” 2018. Web. 11 Apr 2021.

Vancouver:

Chakravarty R. Turbulent Flow Visualization over Surface-mounted Finite-height Cylinders and Square Prisms. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/11214.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chakravarty R. Turbulent Flow Visualization over Surface-mounted Finite-height Cylinders and Square Prisms. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/11214

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

18. Kroshko, Andrew Paul 1978-. Systematic construction of efficient six-stage fifth-order explicit Runge-Kutta embedded pairs without standard simplifying assumptions.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/11831

► This thesis examines methodologies and software to construct explicit Runge-Kutta (ERK) pairs for solving initial value problems (IVPs) by constructing efficient six-stage fifth-order ERK pairs… (more)

▼ This thesis examines methodologies and software to construct explicit Runge-Kutta (ERK) pairs for solving initial value problems (IVPs) by constructing efficient six-stage fifth-order ERK pairs without standard simplifying assumptions. The problem of whether efficient higher-order ERK pairs can be constructed algebraically without the standard simplifying assumptions dates back to at least the 1960s, with Cassity's complete solution of the six-stage fifth-order order conditions. Although RK methods based on the six-stage fifth-order order conditions have been widely studied and have continuing practical importance, prior to this thesis, the aforementioned complete solution to these order conditions has no published usage beyond the original series of publications by Cassity in the 1960s. The complete solution of six-stage fifth-order ERK order conditions published by Cassity in 1969 is not in a formulation that can easily be used for practical purposes, such as a software implementation. However, it is shown in this thesis that when the order conditions are solved and formulated appropriately using a computer algebra system (CAS), the generated code can be used for practical purposes and the complete solution is readily extended to ERK pairs. The condensed matrix form of the order conditions introduced by Cassity in 1969 is shown to be an ideal methodology, which probably has wider applicability, for solving order conditions using a CAS. The software package OCSage developed for this thesis, in order to solve the order conditions and study the properties of the resulting methods, is built on top of the Sage CAS. However, in order to effectively determine that the constructed ERK pairs without standard simplifying assumptions are in fact efficient by some well-defined criteria, the process of selecting the coefficients of ERK pairs is re-examined in conjunction with a sufficient amount of performance data. The pythODE software package developed for this thesis is used to generate a large amount of performance data from a large selection of candidate ERK pairs found using OCSage. In particular, it is shown that there is unlikely to be a well-defined methodology for selecting optimal pairs for general-purpose use, other than avoiding poor choices of certain properties and ensuring the error coefficients are as small as possible. However, for IVPs from celestial mechanics, there are obvious optimal pairs that have specific values of a small subset of the principal error coefficients (PECs). Statements seen in the literature that the best that can be done is treating all PECs equally do not necessarily apply to at least some broad classes of IVPs. By choosing ERK pairs based on specific values of individual PECs, not only are ERK pairs that are 20-30% more efficient than comparable published pairs found for test sets of IVPs from celestial mechanics, but the variation in performance between the best and worst ERK pairs that otherwise would seem to have similar properties is reduced from a factor of 2 down to as… Advisors/Committee Members: Spiteri, Raymond J, Vassileva, Julita, Osgood, Nathaniel D, Patrick, George W, Eramian, Mark.

Subjects/Keywords: numerical methods; ordinary differential equations; explicit Runge-Kutta; simplifying assumptions; computer algebra; numerical experimentation; Python; Sage; software

10 more images…

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APA (6^th Edition):

Kroshko, A. P. 1. (2018). Systematic construction of efficient six-stage fifth-order explicit Runge-Kutta embedded pairs without standard simplifying assumptions. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/11831

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kroshko, Andrew Paul 1978-. “Systematic construction of efficient six-stage fifth-order explicit Runge-Kutta embedded pairs without standard simplifying assumptions.” 2018. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/11831.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kroshko, Andrew Paul 1978-. “Systematic construction of efficient six-stage fifth-order explicit Runge-Kutta embedded pairs without standard simplifying assumptions.” 2018. Web. 11 Apr 2021.

Vancouver:

Kroshko AP1. Systematic construction of efficient six-stage fifth-order explicit Runge-Kutta embedded pairs without standard simplifying assumptions. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/11831.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kroshko AP1. Systematic construction of efficient six-stage fifth-order explicit Runge-Kutta embedded pairs without standard simplifying assumptions. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/11831

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

19. Einian, Maryam. LARGE EDDY SIMULATION OF FLOW AROUND A FINITE SQUARE CYLINDER.

Degree: 2012, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2012-04-443

► The main objective of this research is to develop, document and study numerically the flow around finite-height square cylinders mounted on a ground plane, particularly… (more)

▼ The main objective of this research is to develop, document and study numerically the flow around finite-height square cylinders mounted on a ground plane, particularly in the near-wake region, under various geometrical conditions. Both the time-averaged and instantaneous flow fields are studied. This thesis consists of three main parts: a comprehensive study of flow over an aspect ratio AR = 5 square cylinder, the effect of sub-grid scale (SGS) models on the numerical simulation and the effect of aspect ratio on the flow structure. The first part of the thesis presents the time-averaged and instantaneous flow fields for flow over a wall-mounted finite-height square cylinder of aspect ratio of AR = 5 at a Reynolds number of Re = 500. The time-averaged flow field results are shown to be in good agreement with experiments. Comparison of the time-averaged results with the velocity field for a square cylinder immersed in a thicker boundary layer, suggests that the boundary layer thickness especially affects the upwash flow (Wang et al., 2009). The instantaneous velocity fields provide an in-depth view of the unsteady nature of the flow field. For the flow over a square cylinder of AR = 5, the instantaneous velocity fields are symmetric near the free end. However, antisymmetric patterns observed downstream may be an indication of the presence of periodic von-Karman type vortices. Since the wake regions are characterized by large-scale unsteady motions, turbulent flow over bluff bodies is well suited to large eddy simulation in which the large energy-containing scales of motion, which are responsible for most of the momentum transport, are resolved whereas the small-scale turbulent fluctuations are modeled. In the second part of the thesis, the performance of the three SGS models, the Smagorinsky model (SM), dynamic Smagorinsky model (DSM) and dynamic non-linear model (DNM) are studied for two grid sets of lower and higher resolution. The results indicated that in case of the DSM insufficient grid resolution leads to erroneous predictions, whereas the DNM is a major improvement as the predictions are similar on both the coarse and fine grids. In the third and final part of the thesis, the effect of aspect ratio on the flow over a wall-mounted finite-height square cylinder is numerically investigated. The wake of a finite square cylinder is studied for three aspect ratios of AR = 3, 5 and 7. The time-averaged vorticity was shown to vary with aspect ratio, e.g. as the aspect ratio increases, the vortex structures in a horizontal plane at mid-height became shorter and rounder in shape. The flow field of the finite cylinder is known to be strongly affected by the aspect ratio (Adaramola et al., 2006). For cylinders with relatively small aspect ratios, the two ends affect the flow patterns and significantly alter the flow structure. Advisors/Committee Members: Bergstrom, Donald J., Sumner, David, Bugg, James D., Simonson, Carey J., Spiteri, Raymond J., Yarusevych, Serhiy.

Subjects/Keywords: LARGE EDDY SIMULATION (LES) FINITE SQUARE CYLINDER; BLUFF BODY

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APA (6^th Edition):

Einian, M. (2012). LARGE EDDY SIMULATION OF FLOW AROUND A FINITE SQUARE CYLINDER. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2012-04-443

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Einian, Maryam. “LARGE EDDY SIMULATION OF FLOW AROUND A FINITE SQUARE CYLINDER.” 2012. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/ETD-2012-04-443.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Einian, Maryam. “LARGE EDDY SIMULATION OF FLOW AROUND A FINITE SQUARE CYLINDER.” 2012. Web. 11 Apr 2021.

Vancouver:

Einian M. LARGE EDDY SIMULATION OF FLOW AROUND A FINITE SQUARE CYLINDER. [Internet] [Thesis]. University of Saskatchewan; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/ETD-2012-04-443.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Einian M. LARGE EDDY SIMULATION OF FLOW AROUND A FINITE SQUARE CYLINDER. [Thesis]. University of Saskatchewan; 2012. Available from: http://hdl.handle.net/10388/ETD-2012-04-443

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

20. Haghgoo, Mohammad Reza. Numerical modeling of gas-particle flows inside fluidized beds.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/8601

► Fluidized beds have widespread application in industry due to their increased rate of heat, mass, and momentum transfer. In order to effectively design fluidized beds… (more)

▼ Fluidized beds have widespread application in industry due to their increased rate of heat, mass, and momentum transfer. In order to effectively design fluidized beds at the industrial scale, it is essential to have an understanding of the complex hydrodynamic behavior of the dense gas-particle flows inside them. This thesis is focused on the bubbling fluidization of Geldart B particles. The Eulerian–Eulerian “Two-fluid model” (TFM) approach was used to simulate dense gas-particle flows inside two different three-dimensional (3D) bubbling beds. The numerical code Multiphase Flow with Interphase eXchanges (MFIX) was used to perform all the 3D simulations. The results were validated against published experimental data. This manuscript-based thesis documents four different studies. The first study, Chapter 2, reports an in-depth investigation of two different models for the particle stress tensor in the elastic-inertial regime and assesses their ability to predict the hydrodynamics of a 3D cylindrical fluidized bed. Contours of inertial number, defined as the ratio of the inertial forces to the frictional forces, were used to visualize the flow properties. Analysis of the flow properties for a range of gas-particle regimes based on the inertial number enhances our insight into the flow behavior in such a complex system. Chapter 3 reports a comprehensive study to assess the effect of three different particle-wall boundary conditions (BCs) on the structural features of a dense gas-particle flow inside a 3D thin bubbling bed. Accordingly, the effect of each wall model on the velocity field, 3D bubble statistics, gas-pressure fluctuations, and particle resolved-scale Reynolds stress were investigated. Also, the dominant mixing regions inside the bed were identified in order to quantitatively describe the bed performance. Chapter 4 performs an in-depth systematic study that uses a particle energy budget analysis to investigate the dynamics of the bubbling bed discussed in Chapter 3. The budget analysis helps not only to quantify the relative importance of various terms contributing to the energy cascade, but also to identify the regions in the bed where most of the energy transfer takes place. Chapter 5 applies state-of-the-art post-processing methodologies, namely, the Proper Orthogonal Decom- position (POD) and the swirling strength criterion to the fluctuating particle flow fields predicted by the TFM of a bubbling bed to identify and analyze the dominant spatio-temporal patterns of the particulate phase. The variation of the POD temporal coefficients associated with the particle volume fraction fluctu- ation field suggested the existence of a low-dimensional attractor and irregular periodicity in the flow. The particle vortical motions were characterized by their flat structure. POD was used to obtain a reduced-order reconstruction of the particle velocity and volume fraction fields using a subset of eigenmodes. In summary, this thesis attempts to quantitatively describe some important features of bubbling beds dynamics… Advisors/Committee Members: Bergstrom, Donald J., Spiteri, Raymond J., Szyszkowski, Walerian, Bugg, Jim, Noble, Scott, Zhang, Lifeng.

Subjects/Keywords: Numerical modelling; Fluidized bed; Frictional stress; Wall boundary condition; Energy cascade; Particle phase; POD

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APA (6^th Edition):

Haghgoo, M. R. (2018). Numerical modeling of gas-particle flows inside fluidized beds. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/8601

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Haghgoo, Mohammad Reza. “Numerical modeling of gas-particle flows inside fluidized beds.” 2018. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/8601.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Haghgoo, Mohammad Reza. “Numerical modeling of gas-particle flows inside fluidized beds.” 2018. Web. 11 Apr 2021.

Vancouver:

Haghgoo MR. Numerical modeling of gas-particle flows inside fluidized beds. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/8601.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Haghgoo MR. Numerical modeling of gas-particle flows inside fluidized beds. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/8601

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

21. Schoene, Thomas. Step-Optimized Particle Swarm Optimization.

Degree: 2011, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2011-08-90

► Particle swarm optimization (PSO) is widely used in industrial and academic research to solve optimization problems. Recent developments of PSO show a direction towards adaptive… (more)

Subjects/Keywords: step-optimized particle swarm optimization; adaptive particle swarm optimization; particle swarm optimization; SOPSO; APSO; PSO; optimization; velocity weights; step-optimized; optimized; adaptive

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APA (6^th Edition):

Schoene, T. (2011). Step-Optimized Particle Swarm Optimization. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2011-08-90

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Schoene, Thomas. “Step-Optimized Particle Swarm Optimization.” 2011. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/ETD-2011-08-90.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Schoene, Thomas. “Step-Optimized Particle Swarm Optimization.” 2011. Web. 11 Apr 2021.

Vancouver:

Schoene T. Step-Optimized Particle Swarm Optimization. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/ETD-2011-08-90.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schoene T. Step-Optimized Particle Swarm Optimization. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/ETD-2011-08-90

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

22. Iserhienrhien, Blessing. On the Origin of Close-Range E Region Echoes Observed by SuperDARN HF Radars in the Mid- and High Latitudes.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2016-04-2517

► The Super Dual Auroral Radar Network (SuperDARN) is a global network of coherent high frequency (HF) radars located in the polar, high- and mid-latitudes of… (more)

▼ The Super Dual Auroral Radar Network (SuperDARN) is a global network of coherent high frequency (HF) radars located in the polar, high- and mid-latitudes of both the Northern and Southern hemispheres. This thesis deals with close-range SuperDARN echoes (oblique HF backscatter from the lower part of the ionosphere). The aim of this thesis is to shed light on the origin of these echoes. Previous studies have been content to propose explanations for the origin of these echoes without thorough checking of the proposed mechanisms against constraints available from various radars and other important information. For the purpose of clarifying the situation, a chain of SuperDARN radars in the Northern and Southern hemispheres and several years of daily statistics have been used. This has allowed for several findings. Notably, the close-range SuperDARN echoes show diurnal and seasonal variations and their properties with respect to signal-to-noise-ratio, Doppler velocity and Doppler width vary. Three distinct populations of close-range HF backscatter have been established: (1) a morning population (0400-0700 LT), (2) a midday summer population (0800-1300 LT) and (3) a pre-midnight (2100-2300 LT) population. The morning population is associated with meteor trails which are observed to be peaking near local dawn as expected, and already suggested by previous research. High latitude SuperDARN radars also had echoes (pre-midnight population) with higher Doppler velocities than the others yet the Doppler velocities are smaller than that expected from auroral E region echoes. Given the time and location of this population of echoes, it has been concluded that they are a special class of high latitude E region echoes at high aspect angle which have been termed ``high aspect irregularity region" echoes in the past. Lastly, the midday summer population was found to be too high for polar mesosphere summer echoes and too early for plasma instabilities. It is proposed that these SuperDARN echoes are produced either from contribution from meteors trails or by neutral turbulence which is suspected (from other work) to be present near 100 km. The properties of the midday summer population resembles those of meteor trails as they have the same power, and the same altitude and have high summer occurrence as expected for meteors. Their late morning occurrence could be due to particular look direction of individual radars which may change the occurrence statistics in the presence of meteor showers. With respect to neutral turbulence, the drift of the midday summer population is similar to that of neutral wind. Advisors/Committee Members: St.-Maurice, Jean-Pierre, Ponomarenko, Pasha, Koustov, Alexandre, Steele, Tom, Spiteri, Raymond, Brown, Peter, Noonan, N.

Subjects/Keywords: Near-range echoes; HF backscatter; SuperDARN

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Iserhienrhien, B. (2016). On the Origin of Close-Range E Region Echoes Observed by SuperDARN HF Radars in the Mid- and High Latitudes. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2016-04-2517

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Iserhienrhien, Blessing. “On the Origin of Close-Range E Region Echoes Observed by SuperDARN HF Radars in the Mid- and High Latitudes.” 2016. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/ETD-2016-04-2517.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Iserhienrhien, Blessing. “On the Origin of Close-Range E Region Echoes Observed by SuperDARN HF Radars in the Mid- and High Latitudes.” 2016. Web. 11 Apr 2021.

Vancouver:

Iserhienrhien B. On the Origin of Close-Range E Region Echoes Observed by SuperDARN HF Radars in the Mid- and High Latitudes. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/ETD-2016-04-2517.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Iserhienrhien B. On the Origin of Close-Range E Region Echoes Observed by SuperDARN HF Radars in the Mid- and High Latitudes. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/ETD-2016-04-2517

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

23. Palameta, Alex. Beyond-the-Quark-Model Heavy Hadrons from QCD Sum Rules.

Degree: 2020, University of Saskatchewan

URL: http://hdl.handle.net/10388/12947

► In this thesis, we examine three papers that my coauthors and I have published. The overarching theme of this work will be the use of… (more)

Subjects/Keywords: Meson; Hybrid; Mixing; Diquark; Tetraquark; QCD; Sum Rules

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APA (6^th Edition):

Palameta, A. (2020). Beyond-the-Quark-Model Heavy Hadrons from QCD Sum Rules. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12947

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Palameta, Alex. “Beyond-the-Quark-Model Heavy Hadrons from QCD Sum Rules.” 2020. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/12947.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Palameta, Alex. “Beyond-the-Quark-Model Heavy Hadrons from QCD Sum Rules.” 2020. Web. 11 Apr 2021.

Vancouver:

Palameta A. Beyond-the-Quark-Model Heavy Hadrons from QCD Sum Rules. [Internet] [Thesis]. University of Saskatchewan; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/12947.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Palameta A. Beyond-the-Quark-Model Heavy Hadrons from QCD Sum Rules. [Thesis]. University of Saskatchewan; 2020. Available from: http://hdl.handle.net/10388/12947

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

24. Ho, Jason N.E. Beyond the Conventional Quark Model: Using QCD Sum Rules to Explore the Spectrum of Exotic Hadrons.

Degree: 2020, University of Saskatchewan

URL: http://hdl.handle.net/10388/12979

► Exotic hadrons are theoretical structures allowed by our current understanding of Quantum Chromodynamics (QCD), lying outside the traditional qq̅, qqq, or q̅q̅q̅ understanding of mesons… (more)

Subjects/Keywords: QCD; sum rules; exotic hadrons; hadronic physics; hybrid meson; hybrid baryon; scalar meson

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APA (6^th Edition):

Ho, J. N. E. (2020). Beyond the Conventional Quark Model: Using QCD Sum Rules to Explore the Spectrum of Exotic Hadrons. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12979

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ho, Jason N E. “Beyond the Conventional Quark Model: Using QCD Sum Rules to Explore the Spectrum of Exotic Hadrons.” 2020. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/12979.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ho, Jason N E. “Beyond the Conventional Quark Model: Using QCD Sum Rules to Explore the Spectrum of Exotic Hadrons.” 2020. Web. 11 Apr 2021.

Vancouver:

Ho JNE. Beyond the Conventional Quark Model: Using QCD Sum Rules to Explore the Spectrum of Exotic Hadrons. [Internet] [Thesis]. University of Saskatchewan; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/12979.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ho JNE. Beyond the Conventional Quark Model: Using QCD Sum Rules to Explore the Spectrum of Exotic Hadrons. [Thesis]. University of Saskatchewan; 2020. Available from: http://hdl.handle.net/10388/12979

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

25. Cervi, Jessica. Towards New High-Order Operator Splitting Time-Integration Methods.

Degree: 2020, University of Saskatchewan

URL: http://hdl.handle.net/10388/13090

► Operator splitting (OS) methods represent a powerful strategy to solve an extensive range of mathematical models in the form of differential equations. They have a… (more)

▼ Operator splitting (OS) methods represent a powerful strategy to solve an extensive range of mathematical models in the form of differential equations. They have a long and celebrated history, having been successfully used for well over half a century to provide efficient numerical solutions to challenging problems. In fact, OS methods are often the only viable way to solve many problems in practice. The simplest, and perhaps, most well-known OS methods are Lie – Trotter – Godunov and the Strang – Marchuk methods. They compute a numerical solution that is first-, and second-order accurate in time, respectively. OS methods can be derived by imposing order conditions using the Campbell – Baker – Hausdorff formula. It follows that, by setting the appropriate order conditions, it is possible to derive OS methods of any desired order. An important observation regarding OS methods with order higher than two is that, according to the Sheng – Suzuki theorem, at least one of their defining coefficients must be negative. Therefore, the time integration with OS methods of order higher than two has not been considered suitable to solve deterministic parabolic problems, because the necessary backward time integration would cause instabilities. Throughout this thesis, we focus our attention on high-order (i.e., order higher than two) OS methods. We successfully assess the convergence properties of some higher-order OS methods on diffusion-reaction problems describing cardiac electrophysiology and on an advection-diffusion-reaction problem describing chemical combustion. Furthermore, we compare the efficiency performance of higher-order methods to second-order methods. For all the cases considered, we confirm an improved efficiency performance compared to methods of lower order. Next, we observe how, when using OS and Runge – Kutta type methods to advance the time integration, we can construct a unique extended Butcher tableau with a similar structure to the ones describing Generalized Additive Runge – Kutta (GARK) methods. We define a combination of methods to be OS-GARK methods. We apply linear stability analysis to OS-GARK methods; this allows us to conveniently analyze the stability properties of any combination of OS and Runge – Kutta methods. Doing so, we are able to perform an eigenvalue analysis to understand and improve numerically unstable solutions. Advisors/Committee Members: Spiteri, Raymond J, Rayan, Staven, Patrick, George, Szmigielski, Jacek, Ko, Seok-Bum.

Subjects/Keywords: Operator Splitting; Runge Kutta

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APA (6^th Edition):

Cervi, J. (2020). Towards New High-Order Operator Splitting Time-Integration Methods. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/13090

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cervi, Jessica. “Towards New High-Order Operator Splitting Time-Integration Methods.” 2020. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/13090.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cervi, Jessica. “Towards New High-Order Operator Splitting Time-Integration Methods.” 2020. Web. 11 Apr 2021.

Vancouver:

Cervi J. Towards New High-Order Operator Splitting Time-Integration Methods. [Internet] [Thesis]. University of Saskatchewan; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/13090.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cervi J. Towards New High-Order Operator Splitting Time-Integration Methods. [Thesis]. University of Saskatchewan; 2020. Available from: http://hdl.handle.net/10388/13090

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

26. Goodwin, Lindsay V 1987-. Radar and satellite characterization of the ionosphere under strong electric field conditions.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/8541

► It is now well established that strong electric fields can distort high-latitude ion velocity distributions to the point that this affects Incoherent Scatter Radar (ISR)… (more)

▼ It is now well established that strong electric fields can distort high-latitude ion velocity distributions to the point that this affects Incoherent Scatter Radar (ISR) observations, and therefore the ion and electron temperatures inferred through those observations. Until now, studies of this topic have focused on first order, semi-empirical ion velocity distribution descriptions. However, a precise description has been lacking, notably along directions parallel or near-parallel to the magnetic field. To remedy these shortcomings and provide the best possible tools to analyze ISR observations, this thesis uses a state-of-the-art Monte-Carlo (MC) simulation to retrieve accurate ion velocity distributions for any electric field, ion-neutral particle interaction, and direction relative to the magnetic field. Through these improvements, a number of important points have been made, such as: 1) for the most part simulated NO+ ISR observations can be modeled using Maxwellian velocity distributions having the same line-of-sight ion temperature as the simulated MC distribution, 2) although simulated O+ ISR observations parallel to the magnetic field are similar to those produced from Maxwellian velocity distributions they reflect an erroneous increase in electron temperature due to a wide O+ velocity distribution, and 3) signatures of toroidal ion velocity distributions in IS spectra are possibly the easiest to identify near 20 degrees with respect to the magnetic field. Based on these results, accurate distorted ion velocity distributions are currently being incorporated into IS spectral fitting routines. In the logical next step, this thesis turns to radar observations to characterize the ion temperature anisotropy, which is particularly important for Joule heating studies. Using ISR observations from a particularly strong heating event reported by Clauer et al. (2016), it is found that the O+-O collision cross-section from Knof et al. (1964) represents the anisotropy of the ionosphere fairly accurately, but still suggests the ionosphere to be slightly more anisotropic than expected. Knowing this allows for the preliminary determination of the effective electric field (the electric field in the neutral frame of reference). To obtain the electric field vector at a given latitude and longitude this thesis has explored a novel technique that employs multi-altitude measurements. This method combined with a knowledge of the effective electric field from the ion temperature studies opens up the possibility of a determination of the neutral wind in future work. Finally, to study the impact electric field strength has on Swarm satellites observations and on the upper ionosphere in general, a time-dependent gyro-kinetic O+ model of the motion of ions above a discontinuous boundary between fully collisional and collisionless plasmas has been revisited. This upgraded model uses descriptions of the ion velocity distribution provided by the MC simulation for the boundary velocity distribution as a function of electric field. As… Advisors/Committee Members: St-Maurice, Jean-Pierre, Spiteri, Raymond J, McWilliams, Kathryn A, Tse, John S, Pywell, Robert E, Li, Yanping.

Subjects/Keywords: High-latitude ionosphere; Ion velocity distributions; Ion frictional heating; Monte-Carlo simulations; Incoherent scatter spectra; Electric field determinations; Time-dependent gyro-kinetic model; Plasma stability

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Goodwin, L. V. 1. (2018). Radar and satellite characterization of the ionosphere under strong electric field conditions. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/8541

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Goodwin, Lindsay V 1987-. “Radar and satellite characterization of the ionosphere under strong electric field conditions.” 2018. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/8541.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Goodwin, Lindsay V 1987-. “Radar and satellite characterization of the ionosphere under strong electric field conditions.” 2018. Web. 11 Apr 2021.

Vancouver:

Goodwin LV1. Radar and satellite characterization of the ionosphere under strong electric field conditions. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/8541.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Goodwin LV1. Radar and satellite characterization of the ionosphere under strong electric field conditions. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/8541

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

27. Azizi, Mahsa 1992-. An Efficient Remand Risk Assessment Tool based on Machine Learning Techniques.

Degree: 2019, University of Saskatchewan

URL: http://hdl.handle.net/10388/12421

► The criminal justice system in Saskatchewan is challenged by the large population of people who are charged with committing crimes and are waiting to be… (more)

▼ The criminal justice system in Saskatchewan is challenged by the large population of people who are charged with committing crimes and are waiting to be summoned, the so-called pretrial population. Although some of these people are released until their trial, others are remanded in custody. The two most common reasons people are remanded are: (i) probable failure to appear for their trial and (ii) risk to public safety. A large pretrial population leads to increased expenses for both the government and the defendants. The pretrial population may be reduced using a remand risk assessment tool (RRAT). The goal of the RRAT is to lower the number of unnecessary remands by determining which defendants are likely to not appear or pose a risk to public safety while they are on release. This study uses the Saskatchewan Primary Risk Assessment (SPRA) as an assessment to measure general recidivism in both male and female adult offenders under the jurisdiction of the Ministry of Corrections and Policing. The SPRA, comprised of 15,117 offenders information in the form of 15 questions, is considered as the input to the RRAT. In this thesis, the use of machine learning models is proposed for the RRAT to predict which defendants should be remanded, potentially achieving a reduction in pretrial population size. In the first step, to choose the best machine learning model, several classification models, including the support vector classifier, decision tree classifier, random forest classifier (RFC), naive Bayesian classifier, and extreme learning classifier (ELC), are compared in terms of classification performance. According to the simulation results, the ELC outperformed all other models in the comparison considering all existing features followed by the RFC. The two models of the ELC and the RFC achieved the lowest false positive rate and the highest accuracy, precision, specificity, and area under the curve compared to the other explored models. In the second step, to identify the best features from the SPRA, the ELC is used in conjunction with binary particle swarm optimization (BPSO) and the result is compared to the RFC. The ELC-BPSO has shown high superiority to increase the accuracy of the ELC model by using only seven features of the SPRA data. The ELC-BPSO is able to achieve an accuracy of around 74% using the SPRA data. Advisors/Committee Members: Horsch , Michael, Debajyoti , Mondal, Longhai , Li, Spiteri , Raymond.

Subjects/Keywords: Machine Learning; Random Forests; Support Vector Machines; Naive Bayes; Extreme Learning Machines; Decision Trees

…data that could be seen as sensitive or proprietary. The University of Saskatchewan ethics le…

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APA (6^th Edition):

Azizi, M. 1. (2019). An Efficient Remand Risk Assessment Tool based on Machine Learning Techniques. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12421

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Azizi, Mahsa 1992-. “An Efficient Remand Risk Assessment Tool based on Machine Learning Techniques.” 2019. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/12421.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Azizi, Mahsa 1992-. “An Efficient Remand Risk Assessment Tool based on Machine Learning Techniques.” 2019. Web. 11 Apr 2021.

Vancouver:

Azizi M1. An Efficient Remand Risk Assessment Tool based on Machine Learning Techniques. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/12421.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Azizi M1. An Efficient Remand Risk Assessment Tool based on Machine Learning Techniques. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12421

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Voss, Krzysztof M. pythOPT: A problem-solving environment for optimization methods.

Degree: 2017, University of Saskatchewan

URL: http://hdl.handle.net/10388/7746

► Optimization is a process of finding the best solutions to problems based on mathematical models. There are numerous methods for solving optimization problems, and there… (more)

▼ Optimization is a process of finding the best solutions to problems based on mathematical models. There are numerous methods for solving optimization problems, and there is no method that is superior for all problems. This study focuses on the Particle Swarm Optimization (PSO) family of methods, which is based on the swarm behaviour of biological organisms. These methods are easily adjustable, scalable, and have been proven successful in solving optimization problems. This study examines the performance of nine optimization methods on four sets of problems. The performance analysis of these methods is based on two performance metrics (the win-draw-loss metric and the performance profiles metric) that are used to analyze experimental data. The data are gathered by using each optimization method in multiple configurations to solve four classes of problems. A software package pythOPT was created. It is a problem-solving environment that is comprised of a library, a framework, and a system for benchmarking optimization methods. pythOPT includes code that prepares experiments, executes computations on a distributed system, stores results in a database, analyzes those results, and visualizes analyses. It also includes a framework for building PSO-based methods and a library of benchmark functions used in one of the presented analyses. Using pythOPT, the performance of these nine methods is compared in relation to three parameters: number of available function evaluations, accuracy of solutions, and communication topology. This experiment demonstrates that two methods (SPSO and GCPSO) are superior in finding solutions for the tested classes of problems. Finally, by using pythOPT we can recreate this study and produce similar ones by changing the parameters of an experiment. We can add new methods and evaluate their performances, and this helps in developing new optimization methods. Advisors/Committee Members: Spiteri, Raymond, Eramian, Mark, Horsch, Michael, Steele, Tom.

Subjects/Keywords: optimization; pso; particle swarm optimization; direct; benchmarking

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Voss, K. M. (2017). pythOPT: A problem-solving environment for optimization methods. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7746

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Voss, Krzysztof M. “pythOPT: A problem-solving environment for optimization methods.” 2017. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/7746.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Voss, Krzysztof M. “pythOPT: A problem-solving environment for optimization methods.” 2017. Web. 11 Apr 2021.

Vancouver:

Voss KM. pythOPT: A problem-solving environment for optimization methods. [Internet] [Thesis]. University of Saskatchewan; 2017. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/7746.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Voss KM. pythOPT: A problem-solving environment for optimization methods. [Thesis]. University of Saskatchewan; 2017. Available from: http://hdl.handle.net/10388/7746

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

29. Preuss, Adam. A Study of 2-Additive Splitting for Solving Advection-Diffusion-Reaction Equations.

Degree: 2013, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2013-12-1358

► An initial-value problem consists of an ordinary differential equation subject to an initial condition. The right-hand side of the differential equation can be interpreted as… (more)

▼ An initial-value problem consists of an ordinary differential equation subject to an initial condition. The right-hand side of the differential equation can be interpreted as additively split when it is comprised of the sum of two or more contributing factors. For instance, the right-hand sides of initial-value problems derived from advection-diffusion-reaction equations are comprised of the sum of terms emanating from three distinct physical processes: advection, diffusion, and reaction. In some cases, solutions to initial-value problems can be calculated analytically, but when an analytic solution is unknown or nonexistent, methods of numerical integration are used to calculate solutions. The runtime performance of numerical methods is problem dependent; therefore, one must choose an appropriate numerical method to achieve favourable performance, according to characteristics of the problem. Additive methods of numerical integration apply distinct methods to the distinct contributing factors of an additively split problem. Treating the contributing factors with methods that are known to perform well on them individually has the potential to yield an additive method that outperforms single methods applied to the entire (unsplit) problem. Splittings of the right-hand side can be physics-based, i.e., based on physical characteristics of the problem, such as advection, diffusion, or reaction terms. Splittings can also be based on linearization, called Jacobian splitting in this thesis, where the linearized part of the problem is treated with one method and the rest of the problem is treated with another. A comparison of these splitting techniques is performed by applying a set of additive methods to a test suite of problems. Many common non-additive methods are also included to serve as a performance baseline. To perform this numerical study, a problem-solving environment was developed to evaluate permutations of problems, methods, and their associated parameters. The test suite is comprised of several distinct advection-diffusion-reaction equations that have been chosen to represent a wide range of common problem characteristics. When solving split problems in the test suite, it is found that additive Runge–Kutta methods of orders three, four, and five using Jacobian splitting generally outperform those same methods using physics-based splitting. These results provide evidence that Jacobian splitting is an effective approach when solving such initial-value problems in practice. Advisors/Committee Members: Spiteri, Raymond J., Stavness, Ian, Jamali, Nadeem, Sandu, Adrian.

Subjects/Keywords: Performance of Numerical Methods; Problem-Solving Environments; Splitting Strategies; Additive Runge-Kutta Methods; Advection-Diffusion-Reaction Equations

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Preuss, A. (2013). A Study of 2-Additive Splitting for Solving Advection-Diffusion-Reaction Equations. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2013-12-1358

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Preuss, Adam. “A Study of 2-Additive Splitting for Solving Advection-Diffusion-Reaction Equations.” 2013. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/ETD-2013-12-1358.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Preuss, Adam. “A Study of 2-Additive Splitting for Solving Advection-Diffusion-Reaction Equations.” 2013. Web. 11 Apr 2021.

Vancouver:

Preuss A. A Study of 2-Additive Splitting for Solving Advection-Diffusion-Reaction Equations. [Internet] [Thesis]. University of Saskatchewan; 2013. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/ETD-2013-12-1358.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Preuss A. A Study of 2-Additive Splitting for Solving Advection-Diffusion-Reaction Equations. [Thesis]. University of Saskatchewan; 2013. Available from: http://hdl.handle.net/10388/ETD-2013-12-1358

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

30. Marsh, Christopher. Implications of mountain shading on calculating energy for snowmelt using unstructured triangular meshes.

Degree: 2012, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2012-07-557

► In many parts of the world, the snowmelt energy balance is dominated by net solar shortwave radiation. This is the case in the Canadian Rocky… (more)

▼ In many parts of the world, the snowmelt energy balance is dominated by net solar shortwave radiation. This is the case in the Canadian Rocky Mountains, where clear skies dominate the winter and spring. In mountainous regions, solar irradiance at the snow surface is not only affected by solar angles, atmospheric transmittance, and the slope and aspect of immediate topography, but also by shadows from surrounding terrain. Many hydrological models do not consider such horizon-shadows. The accumulation of errors in estimating solar irradiance by neglecting horizon-shadows can lead to significant errors in calculating the timing and rate of snowmelt due to the seasonal storage of internal energy in the snowpack. A common approach to representing the landscape is through structured meshes. However, such representations introduce errors due to the rigid nature of the mesh, creating artefacts and other constraints. Unstructured triangular meshes are more efficient in their representation of the terrain by allowing for a variable resolution. These meshes do not suffer from the artefact problems of a structured mesh. This thesis demonstrates the increased accuracy of using a horizon-shading model with an unstructured mesh versus standard self-shading algorithms in Marmot Creek Research Basin (MCRB), Alberta, Canada. A systematic basin-wide over-prediction (basin mean expressed as phase change mass: 14 mm, maximum: 200 mm) in net shortwave is observed when only self-shadows are considered. The horizon-shadow model was run at a point scale at three sites throughout MCRB to investigate the effects of scale on the model results. It was found that small triangles were best suited for this topographic region and that shadow patterns were captured accurately. Large triangles were found to be too easily shaded by the model, created many disjointed regions. As well, model results were compared to measurements of mountain shadows by timelapse digital cameras. These images were orthorectified and the shadow regions extracted allowing for a quantitative comparison. It was found that the horizon-model produced results within 10 m of the measured shadows, and properly captured shadow transits. A point-scale energy balance model SNOBAL was run via The Cold Regions Hydrological Model, an HRU based hydrologic model. It was found that in the highly shaded valleys, snowpack ablation could be incorrect by approximately 4 days. Although MCRB was generally not significantly impacted by the over-estimation in irradiance in this study, insight into the horizon-shadowing process was possible as a result of the existing network of radiometers and other meteorological stations at MCRB. Because down-stream processes such as flooding depend on correct headwater snowmelt predictions, quantitative results demonstrating inaccuracies in a modelled component of the surface energy balance can help improve snowmelt modelling. Advisors/Committee Members: Pomeroy, John W., Spiteri, Raymond J., Pietroniro, Al, Marks, Danny.

Subjects/Keywords: snowmelt; solar radiation; shading; mountains; triangulated irregular networks; unstructured mesh; radiation modelling; Canadian Rockies; CRHM

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Marsh, C. (2012). Implications of mountain shading on calculating energy for snowmelt using unstructured triangular meshes. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2012-07-557

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Marsh, Christopher. “Implications of mountain shading on calculating energy for snowmelt using unstructured triangular meshes.” 2012. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/ETD-2012-07-557.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Marsh, Christopher. “Implications of mountain shading on calculating energy for snowmelt using unstructured triangular meshes.” 2012. Web. 11 Apr 2021.

Vancouver:

Marsh C. Implications of mountain shading on calculating energy for snowmelt using unstructured triangular meshes. [Internet] [Thesis]. University of Saskatchewan; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/ETD-2012-07-557.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Marsh C. Implications of mountain shading on calculating energy for snowmelt using unstructured triangular meshes. [Thesis]. University of Saskatchewan; 2012. Available from: http://hdl.handle.net/10388/ETD-2012-07-557

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations