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1.
Bhatia, Saurav.
Non-Rayleigh scattering by a randomly oriented elongated scatterer.
Degree: 2012, MIT and Woods Hole Oceanographic Institution
URL: http://hdl.handle.net/1912/5415 
► The echo statistics of a randomly rough, randomly oriented prolate spheroid that is randomly located in a beampattern are investigated from physics-based principles both analytically…
(more)
▼ The echo statistics of a randomly rough, randomly oriented prolate spheroid that
is randomly located in a beampattern are investigated from physics-based principles
both analytically and by Monte Carlo methods. This is a direct-path geometry in
which reflections from neighboring boundaries are not a factor. The center of the
prolate spheroid is assumed to be con fined to the plane containing the MRA (maximum
response axis). Additionally, the rotation of the prolate spheroid is assumed
to always be in this plane. The statistics and, in particular, the tails of the probability
density function (PDF) and probability of false alarm (PFA) are shown to
be strongly non-Rayleigh and a strong function of shape of scatterer. The tails are
shown to increase above that associated with a Rayleigh distribution with increasing
degree of elongation (aspect ratio) of the scatterer and when roughness effects are introduced. And, as also shown in previous studies, the effects associated with
the scatterer being randomly located in the beam contribute to the non-Rayleigh
nature of the echo. The analytically obtained results are compared to Monte Carlo
simulations for verification.
Subjects/Keywords: Monte Carlo method
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APA (6th Edition):
Bhatia, S. (2012). Non-Rayleigh scattering by a randomly oriented elongated scatterer. (Thesis). MIT and Woods Hole Oceanographic Institution. Retrieved from http://hdl.handle.net/1912/5415
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bhatia, Saurav. “Non-Rayleigh scattering by a randomly oriented elongated scatterer.” 2012. Thesis, MIT and Woods Hole Oceanographic Institution. Accessed April 14, 2021.
http://hdl.handle.net/1912/5415.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bhatia, Saurav. “Non-Rayleigh scattering by a randomly oriented elongated scatterer.” 2012. Web. 14 Apr 2021.
Vancouver:
Bhatia S. Non-Rayleigh scattering by a randomly oriented elongated scatterer. [Internet] [Thesis]. MIT and Woods Hole Oceanographic Institution; 2012. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1912/5415.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bhatia S. Non-Rayleigh scattering by a randomly oriented elongated scatterer. [Thesis]. MIT and Woods Hole Oceanographic Institution; 2012. Available from: http://hdl.handle.net/1912/5415
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
2.
Talbot, Paul W.
Extending the discrete maximum principle for the IMC equations.
Degree: MS, Nuclear Engineering, 2012, Oregon State University
URL: http://hdl.handle.net/1957/36503
► The implicit Monte Carlo (IMC) method [16] for radiative transfer, developed in 1971, provides numerical solutions to the tightly-coupled, highly-nonlinear radiative heat transfer equations in…
(more)
▼ The implicit
Monte Carlo (IMC) method [16] for radiative transfer, developed in 1971, provides numerical solutions to the tightly-coupled, highly-nonlinear radiative heat transfer equations in many physical situations. Despite its popularity, there are instances of overheating in the solution for particular choices of time steps and spatial grid sizes. To prevent overheating, conditions on teh time step size Δt have been sought to ensure that the implicit
Monte Carlo (IMC) equations satisfy a maximum principle. Most recently, a discrete maximum principle (DMP) for teh IMC equations has been developed [32] that predicts the necessary time step size for boundedness given the spatial grid size. Predictions given by this DMP assumed equilibrium thermal initial conditions, was developed using pseudo-analytic and symbolic algebra tools that are computationally expensive, has only been applied to one-dimensional Marshak wave problems, and has not considered the evolution of the DMP predictions over multiple time steps. These limitations restrict the utility of the DMP predictions.
We extend the DMP derivation to overcome these limitations and provide an algorithm that can be introduced into IMC codes with minimal impact on simulation CPU time. This extended DMP effectively treats non-equilibrium thermal initial conditions, decreases calculation time by using multigroup approximations in
frequency, considers multiple spatial dimensions with an arbitrary number of neighboring sources, and overcomes inherent difficulties for the DMP in time-dependent problems.
Disequilibrium in the initial conditions is introduced through a redefinition of existing terms from [32] to different radiation and material temperatures on the first time step. This results in a limiting DMP inequality similar in form to the original. Multifrequency approximations are then applied by assuming separation of variables. Energy deposition from multiple sources is assumed to follow linear superposition and the DMP from [32] is re-derived to incorporate multiple incident sources of energy in multiple dimensions. Lastly, an inherent flaw in the DMP resulting in poor predictions when temperature varies slowly over a region is overcome by developing a threshold temperature difference, above which the DMP operates. We have numerically implemented these improvements and validated the results against IMC solutions, showing the predictive capacity of the more general DMP algorithm. We find the disequlibrium conditions to be properly incorporated into the DMP, and multifrequency approximations to be accurate over a large range of time step and spatial grid sizes. The linear superposition assumption is generally very accurate, but infrequently leads to DMP predictions which are not conservative. We also demonstrate that the temperature difference threshold prevents inaccurate predictions by the DMP while preserving its functionality.
Advisors/Committee Members: Palmer, Todd S. (advisor), Wollaber, Allan B. (committee member).
Subjects/Keywords: Monte Carlo method
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APA (6th Edition):
Talbot, P. W. (2012). Extending the discrete maximum principle for the IMC equations. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/36503
Chicago Manual of Style (16th Edition):
Talbot, Paul W. “Extending the discrete maximum principle for the IMC equations.” 2012. Masters Thesis, Oregon State University. Accessed April 14, 2021.
http://hdl.handle.net/1957/36503.
MLA Handbook (7th Edition):
Talbot, Paul W. “Extending the discrete maximum principle for the IMC equations.” 2012. Web. 14 Apr 2021.
Vancouver:
Talbot PW. Extending the discrete maximum principle for the IMC equations. [Internet] [Masters thesis]. Oregon State University; 2012. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1957/36503.
Council of Science Editors:
Talbot PW. Extending the discrete maximum principle for the IMC equations. [Masters Thesis]. Oregon State University; 2012. Available from: http://hdl.handle.net/1957/36503
Università della Svizzera italiana
3.
Papapanagiotou, Vasileios.
Efficient combinatorial optimization algorithms for logistic
problems.
Degree: 2018, Università della Svizzera italiana
URL: http://doc.rero.ch/record/323079
► The field of logistics and combinatorial optimization features a wealth of NP-hard problems that are of great practical importance. For this reason it is important…
(more)
▼ The field of logistics and combinatorial optimization
features a wealth of NP-hard problems that are of great practical
importance. For this reason it is important that we have efficient
algorithms to provide optimal or near-optimal solutions. In this
work, we study, compare and develop Sampling-Based Metaheuristics
and Exact Methods for logistic problems that are important for
their applications in vehicle routing and scheduling. More
specifically, we study two Stochastic Combinatorial Optimization
Problems (SCOPs) and finally a Combinatorial Optimization Problem
using methods related to the field of Metaheuristics,
Monte Carlo
Sampling, Experimental Algorithmics and Exact Algorithms. For the
SCOPs studied, we emphasize studying the impact of approximating
the objective function to the quality of the final solution found.
We begin by examining Solution Methods for the Orienteering Problem
with Stochastic Travel and Service Times (OPSTS). We introduce the
state-of-the-art before our contributions and proceed to examining
our suggested improvements. The core of our improvements stem from
the approximation of the objective function using a combination of
Monte Carlo sampling and Analytical methods. We present four new
Evaluators (approximations) and discuss their advantages and
disadvantages. We then demonstrate experimentally the advantages of
the Evaluators over the previous state-of-the-art and explore their
trade- offs. We continue by generating large reference datasets and
embedding our Evaluators in two Metaheuristics that we use to find
realistic near-optimal solutions to OPSTS. We demonstrate that our
results are statistically significantly better than the previous
state-of-the-art. In the next chapter, we present the 2-stage
Capacitated Vehicle Routing Problem with Stochastic Demands
inspired by an environmental use case. We propose four different
solution approaches based on different approximations of the
objective function and use the Ant Colony Metaheuristic to find
solutions for the problem. We discuss the trade-offs of each
proposed solution and finally argue about its potentially important
environmental application. Finally, focus on exact methods for the
Sequential Ordering Problem (SOP). Firstly, we make an extensive
experimental comparison of two exact algorithms existing in the
literature from different domains (cargo and transportation and the
other compilers). From the experimental comparison and application
of the algorithms in new contexts we were able to close nine
previously open instances in the literature and improve seventeen
more. It also led to insights for the improvement of one of the
methods (The Branch-and-Bound Approach - B&B). We proceed with
the presentation of the improved version that led to the closing of
eight more instances and speeding up the previous version of the
B&B algorithm by 4%-98%.
Advisors/Committee Members: Gambardella, Luca Maria (Dir.), Roberto (Codir.), Schmidhuber, Jürgen (Codir.).
Subjects/Keywords: Monte Carlo sampling
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APA (6th Edition):
Papapanagiotou, V. (2018). Efficient combinatorial optimization algorithms for logistic
problems. (Thesis). Università della Svizzera italiana. Retrieved from http://doc.rero.ch/record/323079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Papapanagiotou, Vasileios. “Efficient combinatorial optimization algorithms for logistic
problems.” 2018. Thesis, Università della Svizzera italiana. Accessed April 14, 2021.
http://doc.rero.ch/record/323079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Papapanagiotou, Vasileios. “Efficient combinatorial optimization algorithms for logistic
problems.” 2018. Web. 14 Apr 2021.
Vancouver:
Papapanagiotou V. Efficient combinatorial optimization algorithms for logistic
problems. [Internet] [Thesis]. Università della Svizzera italiana; 2018. [cited 2021 Apr 14].
Available from: http://doc.rero.ch/record/323079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Papapanagiotou V. Efficient combinatorial optimization algorithms for logistic
problems. [Thesis]. Università della Svizzera italiana; 2018. Available from: http://doc.rero.ch/record/323079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Guelph
4.
Zielinski, Tash.
Finite-Size Effects Within The 2D BEC-BCS Crossover.
Degree: MS, Department of Physics, 2018, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14286
► We study the finite size effects within the 2D Bose-Einstein-Condensate (BEC) Bardeen-Cooper-Schrieffer(BCS) crossover by varying particle number from small to large to determine the effect…
(more)
▼ We study the finite size effects within the 2D Bose-Einstein-Condensate (BEC) Bardeen-Cooper-Schrieffer(BCS) crossover by varying particle number from small to large to determine the effect on the pairing gap via ground state Diffusion-
Monte-
Carlo (DMC) calculations. Progress is made in the determination of a 2D mean field gap calculation and the 2D gap expression as well as a potential V(k, k') is derived. Using a two body attractive Poschl-Teller potential and 10 optimization parameters we determine optimized wavefunctions with energy minimization. We then vary the number of particle around closed shell values N=10,18,26,42,50,58 and use prescribed methods to determine the pairing gap through out the crossover region with coupling eta = 0.5 to eta = 3.0. We see predicted energy pairing gap suppression from the mean field line in the BCS limit not seen in previous DMC calculations. These results provide a detailed look at the finite size effects present within the BEC-BCS crossover region and show the sensitivity of the gap to finite size effects.
Advisors/Committee Members: Gezerlis, Alexandros (advisor).
Subjects/Keywords: Quantum Monte Carlo
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APA (6th Edition):
Zielinski, T. (2018). Finite-Size Effects Within The 2D BEC-BCS Crossover. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14286
Chicago Manual of Style (16th Edition):
Zielinski, Tash. “Finite-Size Effects Within The 2D BEC-BCS Crossover.” 2018. Masters Thesis, University of Guelph. Accessed April 14, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14286.
MLA Handbook (7th Edition):
Zielinski, Tash. “Finite-Size Effects Within The 2D BEC-BCS Crossover.” 2018. Web. 14 Apr 2021.
Vancouver:
Zielinski T. Finite-Size Effects Within The 2D BEC-BCS Crossover. [Internet] [Masters thesis]. University of Guelph; 2018. [cited 2021 Apr 14].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14286.
Council of Science Editors:
Zielinski T. Finite-Size Effects Within The 2D BEC-BCS Crossover. [Masters Thesis]. University of Guelph; 2018. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14286
Texas A&M University
5.
Peterson, Jacob Ross.
Exponentially-convergent Monte Carlo for the One-dimensional Transport Equation.
Degree: MS, Nuclear Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/152727
► An exponentially-convergent Monte Carlo (ECMC) method is analyzed using the one-group, one-dimension, slab-geometry transport equation. The method is based upon the use of a linear…
(more)
▼ An exponentially-convergent
Monte Carlo (ECMC) method is analyzed using the one-group, one-dimension, slab-geometry transport equation. The method is based upon the use of a linear discontinuous finite-element trial space in position and direction to represent the transport solution. A space-angle h-adaptive algorithm is employed to maintain exponential convergence after stagnation occurs due to in- adequate trial-space resolution. In addition, a biased sampling algorithm is used to adequately converge singular problems. Computational results are presented demonstrating the efficacy of the new approach. We tested our ECMC algorithm against standard
Monte Carlo and found the ECMC method to be generally much more efficient. For a manufacture solution the ECMC algorithm was roughly 200 times more effective than the standard
Monte Carlo. When considering a highly singular pure attenuation problem, the ECMC method was roughly 4000 times more effective.
Advisors/Committee Members: Morel, Jim (advisor), Ragusa, Jean (advisor), Mallick, Bani (committee member).
Subjects/Keywords: Monte Carlo; Geometric Monte Carlo; Exponential Monte Carlo
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APA ·
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APA (6th Edition):
Peterson, J. R. (2014). Exponentially-convergent Monte Carlo for the One-dimensional Transport Equation. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152727
Chicago Manual of Style (16th Edition):
Peterson, Jacob Ross. “Exponentially-convergent Monte Carlo for the One-dimensional Transport Equation.” 2014. Masters Thesis, Texas A&M University. Accessed April 14, 2021.
http://hdl.handle.net/1969.1/152727.
MLA Handbook (7th Edition):
Peterson, Jacob Ross. “Exponentially-convergent Monte Carlo for the One-dimensional Transport Equation.” 2014. Web. 14 Apr 2021.
Vancouver:
Peterson JR. Exponentially-convergent Monte Carlo for the One-dimensional Transport Equation. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1969.1/152727.
Council of Science Editors:
Peterson JR. Exponentially-convergent Monte Carlo for the One-dimensional Transport Equation. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152727
6.
Meziane, Mohamed Cherif.
Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs.
Degree: 2007, Université M'Hamed Bougara Boumerdès
URL: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/1087
► 117 p. : ill. ; 30 cm
Nous traitons à travers ce mémoire du problème des échanges radiatifs entre deux surfaces pour deux cas. Pour…
(more)
▼ 117 p. : ill. ; 30 cm
Nous traitons à travers ce mémoire du problème des échanges radiatifs entre deux surfaces pour deux cas. Pour le premier elles sont séparées par un milieu transparent et pour le deuxième par un milieu semi transparent. Dans une première étape, ce sont les facteurs de forme entre deux surfaces séparées par un milieu parfaitement transparent qui sont évalués par la mise en oeuvre des techniques de Monte Carlo. Les résultats sont comparés avec des résultats analytiques disponibles à travers la littérature. Dans une deuxième phase, des calculs d'échanges radiatifs dans trois types de cavité confinant un MST sont menés par la mise en oeuvre de ces même techniques. La validation de nos calculs est faite grâce à l'existence de solutions analytiques et numériques pour un certain nombre de cas. Des calculs de précision de la méthode utilisée sont réalisés et commentés. En guise d’application, nous recherchons l’évolution des flux échangés lorsque nous faisons varier la nature du MST ainsi que les dimensions de la géométrie considérées. Les résultats que nous obtenons sont très comparables à ceux disponibles et montrent la supériorité des techniques de Monte Carlo sur les autres méthodes numériques comme celles des ordonnées discrètes (OD), en raison des précisions obtenues et de la simplicité de leurs mises en oeuvre
Subjects/Keywords: Monte-Carlo, Méthode de; Radiateurs
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APA ·
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APA (6th Edition):
Meziane, M. C. (2007). Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs. (Thesis). Université M'Hamed Bougara Boumerdès. Retrieved from http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/1087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Meziane, Mohamed Cherif. “Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs.” 2007. Thesis, Université M'Hamed Bougara Boumerdès. Accessed April 14, 2021.
http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/1087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Meziane, Mohamed Cherif. “Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs.” 2007. Web. 14 Apr 2021.
Vancouver:
Meziane MC. Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs. [Internet] [Thesis]. Université M'Hamed Bougara Boumerdès; 2007. [cited 2021 Apr 14].
Available from: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/1087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Meziane MC. Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs. [Thesis]. Université M'Hamed Bougara Boumerdès; 2007. Available from: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/1087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
7.
Sahali, Mohand Akli.
Evaluation des effets des paramètres du tournage : modélisation et optimisation multi-objectifs basées sur des méthodes de soft computing – stratégies et précision.
Degree: 2016, Université M'Hamed Bougara Boumerdès
URL: http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2938
► 173 p. : ill. ; 30 cm
La quasi-totalité des travaux, dédiés à l'optimisation des paramètres de coupe en tournage, repose sur des stratégies d’optimisation…
(more)
▼ 173 p. : ill. ; 30 cm
La quasi-totalité des travaux, dédiés à l'optimisation des paramètres de coupe en tournage, repose sur des stratégies d’optimisation classiques, qui ont toutefois été appliquées efficacement à l'échelle industrielle. Cependant, la robustesse et la fiabilité de ce procédé ont été négligées à tort, car l'existence de quelques facteurs incontrôlables peut altérer la justesse des résultats obtenus et affecter d’écarts risquant de dégrader la qualité des pièces usinées, la productivité et le matériel usinant. Dans un premier temps, nous avons identifié les sources d’incertitudes relatives au procédé de tournage. Puis la quantification et la modélisation des incertitudes ainsi que la maîtrise des mesures de robustesse basée sur différents critères statistiques nous ont permis de développer une approche pour l’optimisation multi-objectifs des paramètres de coupe en nous basant sur une technique d’optimisation innovante de la classe des Soft-Computing, qui a permis de déterminer et de départager les optima performants, robustes et fiables. Nous avons, à cet effet, développé et implémenté sous Matlab™, un algorithme génétique efficient de type Monte Carlo-Genetic Algorithm, intégrant un mécanisme d’évaluation robuste de la fonction « fitness » basée sur les simulations de Monte-Carlo pour le seul calcul de la mesure de robustesse. Cette première approche a été validée, après une application illustrative pour la minimisation du coût et du temps de production sous contraintes des limitations de production liées au système Pièce-Outil-Machine, ayant permis la détermination des résultats performants et robustes, ainsi que leur identification. Cette approche a également montré des limitations concernant la satisfaction des contraintes de production imposées. Dans un deuxième temps, une approche fiabiliste pour l’optimisation multi-objectifs est proposée, introduisant un concept de fiabilité pragmatique basé sur des probabilités de défaillance pour contourner et maîtriser le risque de violation des contraintes d’optimisation stochastiques. Cette deuxième approche est basée sur l’algorithme génétique de tri non dominé probabiliste, dit P-NSGA-II, qui intègre les simulations Monte-Carlo pour un calcul précis aussi bien de la fiabilité, que de la robustesse. L’efficience et l'efficacité de cette approche ont été vérifiées par la résolution de deux problèmes numériques de référence. Les deux cas d’étude traités, qui sont d’une extrême complexité, sont relatifs aux opérations d’ébauche multi-passes et de finition, et se caractérisent par des espaces de recherche, respectivement «clos» et « déformé ». Dans les deux situations explorées, les solutions optimales obtenues par la mise en oeuvre de l'algorithme P-NSGA-II, sont analysées, discutées et comparées avec les résultats obtenus et publiés dans des travaux de recherche de références. En conclusion, cette approche a permis de générer et de départager de façon efficace et précise des solutions performantes, robustes et fiables
Subjects/Keywords: Modélisation; Tournage; Simulations Monte-Carlo
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sahali, M. A. (2016). Evaluation des effets des paramètres du tournage : modélisation et optimisation multi-objectifs basées sur des méthodes de soft computing – stratégies et précision. (Thesis). Université M'Hamed Bougara Boumerdès. Retrieved from http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2938
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sahali, Mohand Akli. “Evaluation des effets des paramètres du tournage : modélisation et optimisation multi-objectifs basées sur des méthodes de soft computing – stratégies et précision.” 2016. Thesis, Université M'Hamed Bougara Boumerdès. Accessed April 14, 2021.
http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2938.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sahali, Mohand Akli. “Evaluation des effets des paramètres du tournage : modélisation et optimisation multi-objectifs basées sur des méthodes de soft computing – stratégies et précision.” 2016. Web. 14 Apr 2021.
Vancouver:
Sahali MA. Evaluation des effets des paramètres du tournage : modélisation et optimisation multi-objectifs basées sur des méthodes de soft computing – stratégies et précision. [Internet] [Thesis]. Université M'Hamed Bougara Boumerdès; 2016. [cited 2021 Apr 14].
Available from: http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2938.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sahali MA. Evaluation des effets des paramètres du tournage : modélisation et optimisation multi-objectifs basées sur des méthodes de soft computing – stratégies et précision. [Thesis]. Université M'Hamed Bougara Boumerdès; 2016. Available from: http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2938
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
8.
Meziane, Mohamed Cherif.
Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs.
Degree: 2007, Université M'Hamed Bougara Boumerdès
URL: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/445
► 117 p. ; ill. ; 30 cm
Nous traitons à travers ce mémoire du problème des échanges radiatifs entre deux surfaces pour deux cas. Pour…
(more)
▼ 117 p. ; ill. ; 30 cm
Nous traitons à travers ce mémoire du problème des échanges radiatifs entre deux surfaces pour deux cas. Pour le premier elles sont séparées par un milieu transparent et pour le deuxième par un milieu semi transparent. Dans une première étape, ce sont les facteurs de forme entre deux surfaces séparées par un milieu parfaitement transparent qui sont évalués par la mise en oeuvre des techniques de Monte Carlo. Les résultats sont comparés avec des résultats analytiques disponibles à travers la littérature. Dans une deuxième phase, des calculs d'échanges radiatifs dans trois types de cavité confinant un MST sont menés par la mise en oeuvre de ces même techniques. La validation de nos calculs est faite grâce à l'existence de solutions analytiques et numériques pour un certain nombre de cas. Des calculs de précision de la méthode utilisée sont réalisés et commentés. En guise d’application, nous recherchons l’évolution des flux échangés lorsque nous faisons varier la nature du MST ainsi que les dimensions de la géométrie considérées. Les résultats que nous obtenons sont très comparables à ceux disponibles et montrent la supériorité des techniques de Monte Carlo sur les autres méthodes numériques comme celles des ordonnées discrètes (OD), en raison des précisions obtenues et de la simplicité de leurs mises en oeuvre
Subjects/Keywords: Monte-Carlo, Méthode de; Radiateurs
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APA (6th Edition):
Meziane, M. C. (2007). Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs. (Thesis). Université M'Hamed Bougara Boumerdès. Retrieved from http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/445
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Meziane, Mohamed Cherif. “Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs.” 2007. Thesis, Université M'Hamed Bougara Boumerdès. Accessed April 14, 2021.
http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/445.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Meziane, Mohamed Cherif. “Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs.” 2007. Web. 14 Apr 2021.
Vancouver:
Meziane MC. Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs. [Internet] [Thesis]. Université M'Hamed Bougara Boumerdès; 2007. [cited 2021 Apr 14].
Available from: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/445.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Meziane MC. Utilisation des techniques de Monte-Carlo pour l'évaluation des échanges radiatifs. [Thesis]. Université M'Hamed Bougara Boumerdès; 2007. Available from: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/445
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
9.
Guan, Fada 1982-.
Application of Dynamic Monte Carlo Technique in Proton Beam Radiotherapy using Geant4 Simulation Toolkit.
Degree: PhD, Nuclear Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/149220
► Monte Carlo method has been successfully applied in simulating the particles transport problems. Most of the Monte Carlo simulation tools are static and they can…
(more)
▼ Monte Carlo method has been successfully applied in simulating the particles transport problems. Most of the
Monte Carlo simulation tools are static and they can only be used to perform the static simulations for the problems with fixed physics and geometry settings. Proton therapy is a dynamic treatment technique in the clinical application. In this research, we developed a method to perform the dynamic
Monte Carlo simulation of proton therapy using Geant4 simulation toolkit. A passive-scattering treatment nozzle equipped with a rotating range modulation wheel was modeled in this research.
One important application of the
Monte Carlo simulation is to predict the spatial dose distribution in the target geometry. For simplification, a mathematical model of a human body is usually used as the target, but only the average dose over the whole organ or tissue can be obtained rather than the accurate spatial dose distribution. In this research, we developed a method using MATLAB to convert the medical images of a patient from CT scanning into the patient voxel geometry. Hence, if the patient voxel geometry is used as the target in the
Monte Carlo simulation, the accurate spatial dose distribution in the target can be obtained.
A data analysis tool?root was used to score the simulation results during a Geant4 simulation and to analyze the data and plot results after simulation.
Finally, we successfully obtained the accurate spatial dose distribution in part of a human body after treating a patient with prostate cancer using proton therapy.
Advisors/Committee Members: Poston, John W (advisor), Braby, Leslie A (committee member), Ford, John R (committee member), Turner, Nancy D (committee member).
Subjects/Keywords: Geant4; Proton Therapy; Monte Carlo
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APA (6th Edition):
Guan, F. 1. (2012). Application of Dynamic Monte Carlo Technique in Proton Beam Radiotherapy using Geant4 Simulation Toolkit. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149220
Chicago Manual of Style (16th Edition):
Guan, Fada 1982-. “Application of Dynamic Monte Carlo Technique in Proton Beam Radiotherapy using Geant4 Simulation Toolkit.” 2012. Doctoral Dissertation, Texas A&M University. Accessed April 14, 2021.
http://hdl.handle.net/1969.1/149220.
MLA Handbook (7th Edition):
Guan, Fada 1982-. “Application of Dynamic Monte Carlo Technique in Proton Beam Radiotherapy using Geant4 Simulation Toolkit.” 2012. Web. 14 Apr 2021.
Vancouver:
Guan F1. Application of Dynamic Monte Carlo Technique in Proton Beam Radiotherapy using Geant4 Simulation Toolkit. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1969.1/149220.
Council of Science Editors:
Guan F1. Application of Dynamic Monte Carlo Technique in Proton Beam Radiotherapy using Geant4 Simulation Toolkit. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/149220
University of Waterloo
10.
Lee, Yong Hwan.
Transition Matrix Monte Carlo Methods for Complex Systems.
Degree: 2019, University of Waterloo
URL: http://hdl.handle.net/10012/14525
► The aim of this thesis is to develop efficient transition matrix Monte Carlo simulation methods for complex systems(e.g., spin glasses) that enable one to construct…
(more)
▼ The aim of this thesis is to develop efficient transition matrix Monte Carlo simulation methods for complex systems(e.g., spin glasses) that enable one to construct the transition matrix from which the density of states is calculated with high accuracy. In this thesis, I explore a series of the transition matrix Monte Carlo techniques that are newly developed to generate the density of states with high accuracy for various systems that exhibit phase transitions. The Ising model and the Potts model are used to demonstrate the performance of each methods. Especially, the specific heat curve of the two-dimensional Ising model is evaluated and compared to the exact result as a stringent accuracy test in many cases. I extend the \emph{monovariate} multicanonical transition matrix Monte Carlo method to a \emph{bivariate} version for the calculation of the joint density of states which depends on the energy and a second variable associated with the order parameter. This bivariate version is applied to the Edward-Anderson spin glass model which is one of the most challenging model in the field of computer simulation.
After presenting the theoretical basis of the transition matrix Monte Carlo method, I explain the regulated temperature method which populates the transition matrix by the Metropolis algorithm with continuously varying temperature according to a certain schedule. I introduce new techniques that can produce the optimized temperature schedule in the context of the two-dimensional Ising model. Next I proceed to present the multicanonical transition matrix Monte Carlo method in which the transition matrix is constructed through the multicanonical iteration procedure. Although this method itself is faster than other existing techniques such as the broad histogram method and Wang-Landau algorithm, its simulation speed can be further increased by the renormalization idea which utilizes the simulation results for a small system to obtain an accurate initial estimate of the density of states for a large system through the convolution procedures. Especially a novel procedure about how to apply the renormalization idea in multiple dimensions is presented.
To study the critical behavior of the spin glasses, to my knowledge for the first time, I employ the \emph{bivariate} multicanonical sampling to construct the transition tensor from which the joint density of states can be calculated with high accuracy. I introduce a calculation technique that transforms the massive transition tensor to a normal transition matrix to avoid the cumbersome manipulation of tensors. Using the joint density of states, Landau free energies, the probability distribution functions of spin overlap and Binder parameters are calculated. Contrary to the majority of the previous reports in the literature, the results of my method provide evidences that nonzero temperature phase transition occurs in the two-dimensional Ising spin glass. For the ± J Ising spin glass, the critical temperature obtained by my method is Tc/J \approx 0.45…
Subjects/Keywords: Monte Carlo simulations; spin glass
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APA (6th Edition):
Lee, Y. H. (2019). Transition Matrix Monte Carlo Methods for Complex Systems. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14525
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lee, Yong Hwan. “Transition Matrix Monte Carlo Methods for Complex Systems.” 2019. Thesis, University of Waterloo. Accessed April 14, 2021.
http://hdl.handle.net/10012/14525.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lee, Yong Hwan. “Transition Matrix Monte Carlo Methods for Complex Systems.” 2019. Web. 14 Apr 2021.
Vancouver:
Lee YH. Transition Matrix Monte Carlo Methods for Complex Systems. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/10012/14525.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lee YH. Transition Matrix Monte Carlo Methods for Complex Systems. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/14525
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
11.
Lane, Taylor K.
Energy Density Gradient Estimation for Monte Carlo Methods in Mix Models.
Degree: MS, Nuclear Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/156162
► A common method to solving coupled radiation-hydrodynamics simulations is to use the Implicit Monte Carlo method as the radiation solve and the BHR-2 mix model…
(more)
▼ A common method to solving coupled radiation-hydrodynamics simulations is to use the Implicit
Monte Carlo method as the radiation solve and the BHR-2 mix model for the hydrodynamics solve. This methodology has been shown to be susceptible to the stochastic noise inherent to IMC. This thesis shows why the BHR-2 is susceptible to the noise, and why linear filters are not the best solution to alleviating this susceptibility. A finite element representation is derived to approximate the gradient of the energy density, which is the coupling quantity between the radiation and hydrodynamics solve. Results using this finite element estimator, are presented for two problems of different complexity, and compared to results using a finite difference method to approximate the energy density gradient. The estimator is shown to reduce the variance in the gradient, which would lead to a decrease in the computational cost of IMC/BHR-2 simulations, and increase their robustness to stochastic noise.
Advisors/Committee Members: McClarren, Ryan G (advisor), Donzis, Diego A (committee member), Tsvetkov, Pavel V (committee member).
Subjects/Keywords: Monte Carlo; Radiation Hydrodynamics; mix
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APA (6th Edition):
Lane, T. K. (2015). Energy Density Gradient Estimation for Monte Carlo Methods in Mix Models. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156162
Chicago Manual of Style (16th Edition):
Lane, Taylor K. “Energy Density Gradient Estimation for Monte Carlo Methods in Mix Models.” 2015. Masters Thesis, Texas A&M University. Accessed April 14, 2021.
http://hdl.handle.net/1969.1/156162.
MLA Handbook (7th Edition):
Lane, Taylor K. “Energy Density Gradient Estimation for Monte Carlo Methods in Mix Models.” 2015. Web. 14 Apr 2021.
Vancouver:
Lane TK. Energy Density Gradient Estimation for Monte Carlo Methods in Mix Models. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1969.1/156162.
Council of Science Editors:
Lane TK. Energy Density Gradient Estimation for Monte Carlo Methods in Mix Models. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/156162
University of Texas Southwestern Medical Center
12.
Pidikiti, Rajesh 1982-.
Development of Monte Carlo Treatment Planning and Dosimetry System for Small Animal Irradiator.
Degree: 2012, University of Texas Southwestern Medical Center
URL: http://hdl.handle.net/2152.5/ETD-UTSWMED-2012-12-53
► This work utilizes Monte Carlo simulation techniques to build a model of an x-ray tube in order to develop Monte Carlo treatment planning system for…
(more)
▼ This work utilizes
Monte Carlo simulation techniques to build a model of an x-ray tube in order to develop
Monte Carlo treatment planning system for a small animal irradiator.
To accomplish this, the absolute dose calibration of the irradiator performed in accordance with the recommendations of AAPM TG-61 protocol. Both in-air and in-water calibrations were performed at a 30.5 cm source-to-surface distance (SSD) for the reference applicator 40x40 mm2 square field size. The BEAM/EGS was used to model 225 kV photon beams from a small animal irradiator (Precision XRAD225). The
Monte Carlo model was extensively tuned to provide good agreement with achievable measurements of the beam characteristics (e.g. PDD and off-axis ratios). Subsequently, output factors for various square and circular applicators were measured using different dosimeters (ionization chamber, radiochromic film) and compared with MC simulations. The standard gamma index method with AAPM TG 53 recommendations are used to benchmark the measurements (radio chromic film) against planar dose (
Monte Carlo simulation) along with isodose lines and profiles in both homogeneous and heterogeneous mediums. The statistical uncertainty on the MC-calculated results is between 0.5% and 2% for most points. The CBCT images obtained on the XRAD 225Cx irradiator were converted to a material /density matrix as an input to DOSXYZnrc a MC dose computation module. The measured and computed point doses and isodose distributions were compared using the gamma index method. The absolute dose measured for reference collimator at 30.5 cm SSD in water and in air is 3.42 and 3.45 Gy/min. The agreement between simulated and measured dosimetric characteristics was excellent. For all fields, a good agreement is observed between measurements and calculations. Finally, a
Monte Carlo treatment planning system for heterogeneous media is developed and validated.
Monte Carlo simulation provides an indispensible tool for validating measurements of the smallest field sizes used in preclinical small animal irradiation.
Advisors/Committee Members: Stojadinovic, Strahinja, Solberg, Timothy, Anderson, Jon, Foster, Ryan, Medin, Paul.
Subjects/Keywords: Calibration; Monte Carlo Method; Radiometry
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APA (6th Edition):
Pidikiti, R. 1. (2012). Development of Monte Carlo Treatment Planning and Dosimetry System for Small Animal Irradiator. (Thesis). University of Texas Southwestern Medical Center. Retrieved from http://hdl.handle.net/2152.5/ETD-UTSWMED-2012-12-53
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pidikiti, Rajesh 1982-. “Development of Monte Carlo Treatment Planning and Dosimetry System for Small Animal Irradiator.” 2012. Thesis, University of Texas Southwestern Medical Center. Accessed April 14, 2021.
http://hdl.handle.net/2152.5/ETD-UTSWMED-2012-12-53.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pidikiti, Rajesh 1982-. “Development of Monte Carlo Treatment Planning and Dosimetry System for Small Animal Irradiator.” 2012. Web. 14 Apr 2021.
Vancouver:
Pidikiti R1. Development of Monte Carlo Treatment Planning and Dosimetry System for Small Animal Irradiator. [Internet] [Thesis]. University of Texas Southwestern Medical Center; 2012. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/2152.5/ETD-UTSWMED-2012-12-53.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pidikiti R1. Development of Monte Carlo Treatment Planning and Dosimetry System for Small Animal Irradiator. [Thesis]. University of Texas Southwestern Medical Center; 2012. Available from: http://hdl.handle.net/2152.5/ETD-UTSWMED-2012-12-53
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
13.
Fang, Yuan.
Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors.
Degree: 2013, University of Waterloo
URL: http://hdl.handle.net/10012/7650
► This thesis describes the development of a novel comprehensive Monte Carlo simulation code, ARTEMIS, for the investigation of electron-hole pair transport mechanisms in a-Se x-ray…
(more)
▼ This thesis describes the development of a novel comprehensive Monte Carlo simulation code, ARTEMIS, for the investigation of electron-hole pair transport mechanisms in a-Se x-ray imaging detectors. ARTEMIS allows for modeling of spatiotemporal carrier transport in a-Se, combining an existing Monte Carlo simulation package, PENELOPE, for simulation of x-ray and secondary electron interactions and new routines for electron-hole pair transport with three-dimensional spatiotemporal signal output considering the effects of applied electric field. The detector Swank factor, an important imaging performance metric is calculated from simulated pulse-height spectra and shown to depend on incident x-ray energy and applied electric field. Simulation results are compared to experimental measurements and are found to agree within 2%. Clinical x-ray spectra are also used to study detector performance in terms of energy weighting and electronic noise. Simulation results show energy-weighting effects are taken into account in the ARTEMIS model, where the Swank factor and DQE have a higher dependence on the high-energy incident x rays due to increased carrier yield. Electronic noise is found to widen the pulse-height spectra and degrade the Swank factor. The effect of recombination algorithms and burst models are studied. A comparison of a first-hit algorithm and a nearest-neighbor approach shows no significant difference in the simulation output while achieving reduced simulation time. The examination of the initial generation of carriers in the burst shows that the recombination efficiency of carriers is dependent on the carrier density and electric field. Finally, the spatial resolution characteristics of a flat-panel a-Se detector are studied by using the ARTEMIS model for spatial output and image generation. The modulation transfer functions are calculated from simulated detector point response functions for monoenergetic and clinical radiation qualities.
Subjects/Keywords: Monte Carlo; X-ray Detector
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APA (6th Edition):
Fang, Y. (2013). Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7650
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fang, Yuan. “Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors.” 2013. Thesis, University of Waterloo. Accessed April 14, 2021.
http://hdl.handle.net/10012/7650.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fang, Yuan. “Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors.” 2013. Web. 14 Apr 2021.
Vancouver:
Fang Y. Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/10012/7650.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fang Y. Monte Carlo Transport Methods for Semiconductor X-ray Imaging Detectors. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7650
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Wollongong
14.
Peter Lazarakis, Peter.
Assessment of Monte Carlo approaches to nanodosimetry.
Degree: PhD, 2016, University of Wollongong
URL: ;
https://ro.uow.edu.au/theses/4658
Though Nanodosimetry is a relatively new field it is rapidly developing into a potentially important tool in the fields of radiation protection and radiobiology. This thesis focused on an investigation into the use of Monte Carlo tools for Nanodosimetric based studies.
Subjects/Keywords: Nanodosimetry; Monte Carlo; Geant4
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APA (6th Edition):
Peter Lazarakis, P. (2016). Assessment of Monte Carlo approaches to nanodosimetry. (Doctoral Dissertation). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/4658
Chicago Manual of Style (16th Edition):
Peter Lazarakis, Peter. “Assessment of Monte Carlo approaches to nanodosimetry.” 2016. Doctoral Dissertation, University of Wollongong. Accessed April 14, 2021.
; https://ro.uow.edu.au/theses/4658.
MLA Handbook (7th Edition):
Peter Lazarakis, Peter. “Assessment of Monte Carlo approaches to nanodosimetry.” 2016. Web. 14 Apr 2021.
Vancouver:
Peter Lazarakis P. Assessment of Monte Carlo approaches to nanodosimetry. [Internet] [Doctoral dissertation]. University of Wollongong; 2016. [cited 2021 Apr 14].
Available from: ; https://ro.uow.edu.au/theses/4658.
Council of Science Editors:
Peter Lazarakis P. Assessment of Monte Carlo approaches to nanodosimetry. [Doctoral Dissertation]. University of Wollongong; 2016. Available from: ; https://ro.uow.edu.au/theses/4658
Queensland University of Technology
15.
Crowe, Scott Bradley.
The development of Monte Carlo techniques for the verification of radiotherapy treatments.
Degree: 2011, Queensland University of Technology
URL: https://eprints.qut.edu.au/46961/
► Radiotherapy is a cancer treatment modality in which a dose of ionising radiation is delivered to a tumour. The accurate calculation of the dose to…
(more)
▼ Radiotherapy is a cancer treatment modality in which a dose of ionising radiation is delivered to a tumour. The accurate calculation of the dose to the patient is very important in the design of an effective therapeutic strategy. This study aimed to systematically examine the accuracy of the radiotherapy dose calculations performed by clinical treatment planning systems by comparison againstMonte Carlo simulations of the treatment delivery. A suite of software tools known as MCDTK (Monte Carlo DICOM ToolKit) was developed for this purpose, and is capable of: • Importing DICOM-format radiotherapy treatment plans and producing Monte Carlo simulation input files (allowing simple simulation of complex treatments), and calibrating the results; • Analysing the predicted doses of and deviations between the Monte Carlo simulation results and treatment planning system calculations in regions of interest (tumours and organs-at-risk) and generating dose-volume histograms, so that conformity with dose prescriptions can be evaluated. The code has been tested against various treatment planning systems, linear acceleratormodels and treatment complexities. Six clinical head and neck cancer treatments were simulated and the results analysed using this software. The deviations were greatest where the treatment volume encompassed tissues on both sides of an air cavity. This was likely due to the method the planning system used to model low density media.
Subjects/Keywords: radiotherapy treatments; Monte Carlo techniques
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APA (6th Edition):
Crowe, S. B. (2011). The development of Monte Carlo techniques for the verification of radiotherapy treatments. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/46961/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Crowe, Scott Bradley. “The development of Monte Carlo techniques for the verification of radiotherapy treatments.” 2011. Thesis, Queensland University of Technology. Accessed April 14, 2021.
https://eprints.qut.edu.au/46961/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Crowe, Scott Bradley. “The development of Monte Carlo techniques for the verification of radiotherapy treatments.” 2011. Web. 14 Apr 2021.
Vancouver:
Crowe SB. The development of Monte Carlo techniques for the verification of radiotherapy treatments. [Internet] [Thesis]. Queensland University of Technology; 2011. [cited 2021 Apr 14].
Available from: https://eprints.qut.edu.au/46961/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Crowe SB. The development of Monte Carlo techniques for the verification of radiotherapy treatments. [Thesis]. Queensland University of Technology; 2011. Available from: https://eprints.qut.edu.au/46961/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
16.
Egan, Alexander J.
Development of an accurate Monte Carlo treatment plan calculation framework for the purpose of developing dose calculation error predictors for a widely implemented clinical algorithm.
Degree: PhD, Medical Physics, 2014, Oregon State University
URL: http://hdl.handle.net/1957/48897
► Monte Carlo (MC) algorithms are widely accepted as the most accurate method to calculate dose in a patient geometry. For this work the EGSnrc MC…
(more)
▼ Monte Carlo (MC) algorithms are widely accepted as the most accurate method to calculate dose in a patient geometry. For this work the EGSnrc MC code was used as a benchmark for the identification of dose calculation errors produced by the widely implemented analytical anisotropic algorithm (AAA). By correlating the location and magnitude of these errors with the physical conditions under which AAA is known to fail, a set of error prediction methods was developed which can help to identify clinical plans that are at high risk for AAA dose calculation errors. Once these plans are identified, they can be recalculated with a more accurate algorithm. First, in order to calculate clinical treatment plans with MC, a treatment plan calculation framework (MCTPCF) was developed and validated. The underlying beam model used in the MCTPCF was thoroughly benchmarked against a standard open field data set. Radiochromic film measurements were then used to validate the geometry of the employed MC multileaf collimator (MLC) model. Mechanical functionality of the MCTPCF was verified by calculating several highly modulated clinical treatment plans and comparing them with AAA calculations. Next, three novel error prediction algorithms were developed and validated to a limited extent. The first, designated the field size index (FSI), identifies regions in the treatment plan space where many small fields or blocks overlap, leading to a build-up of beam modeling and volume averaging errors. The second, designated the heterogeneous scatter index (HSI), identifies regions within the electron density distribution where the AAA rectilinear kernel scaling approximation is stressed. The third, designated the low-density index (LDI), identifies regions of very low electron density where AAA is known to overestimate dose. An open field beam model for the 6MV Varian Clinac has been fully parameterized and is able to calculate dose to within 1.3% and 1.0 mm DTA (σ[mean] = 0.3%). The MCTPCF has been shown to accurately calculate highly modulated, multiple field treatments. FSI calculations show excellent agreement with MC/AAA deviations in highly modulated MLC fields in water, and to a lesser extent in patient geometry RapidArc treatments. The LDI accurately predicts AAA overdosing for simple geometries, however for the lung case investigated other sources of error made identifying any correlation a challenge. The theoretical structure of the HSI has been developed, however its implementation is still underway. An accurate MC based treatment plan calculation tool has been developed and validated. Three novel error prediction algorithms have been developed, two of which have been validated for homogenous geometries. In particular, the FSI shows promise as both a direct predictor of AAA error, and also as a general treatment plan complexity index. With sufficient benchmarking, these methods may be developed into a clinical tool that can identify treatment plans that are at high risk for AAA dose calculation errors.
Advisors/Committee Members: Laub, Wolfram (advisor), Palmer, Camille (committee member).
Subjects/Keywords: Monte Carlo; Radiation – Dosage
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APA (6th Edition):
Egan, A. J. (2014). Development of an accurate Monte Carlo treatment plan calculation framework for the purpose of developing dose calculation error predictors for a widely implemented clinical algorithm. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/48897
Chicago Manual of Style (16th Edition):
Egan, Alexander J. “Development of an accurate Monte Carlo treatment plan calculation framework for the purpose of developing dose calculation error predictors for a widely implemented clinical algorithm.” 2014. Doctoral Dissertation, Oregon State University. Accessed April 14, 2021.
http://hdl.handle.net/1957/48897.
MLA Handbook (7th Edition):
Egan, Alexander J. “Development of an accurate Monte Carlo treatment plan calculation framework for the purpose of developing dose calculation error predictors for a widely implemented clinical algorithm.” 2014. Web. 14 Apr 2021.
Vancouver:
Egan AJ. Development of an accurate Monte Carlo treatment plan calculation framework for the purpose of developing dose calculation error predictors for a widely implemented clinical algorithm. [Internet] [Doctoral dissertation]. Oregon State University; 2014. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1957/48897.
Council of Science Editors:
Egan AJ. Development of an accurate Monte Carlo treatment plan calculation framework for the purpose of developing dose calculation error predictors for a widely implemented clinical algorithm. [Doctoral Dissertation]. Oregon State University; 2014. Available from: http://hdl.handle.net/1957/48897
Oregon State University
17.
Lewis, Paul (Paul Arthur).
Ensemble Monte-Carlo planning : an empirical study.
Degree: MS, Computer Science, 2010, Oregon State University
URL: http://hdl.handle.net/1957/16472
► Monte-Carlo planning algorithms such as UCT make decisions at each step by intelligently expanding a single search tree given the available time and then selecting…
(more)
▼ Monte-
Carlo planning algorithms such as UCT make decisions at each step by
intelligently expanding a single search tree given the available time and then
selecting the best root action. Recent work has provided evidence that it can be
advantageous to instead construct an ensemble of search trees and make a
decision according to a weighted vote. However, these prior investigations have
only considered the application domains of Go and Solitaire and were limited in
the scope of ensemble configurations considered. In this paper, we conduct a
large scale empirical study of ensemble
Monte-
Carlo planning using the UCT
algorithm in a set of five additional diverse and challenging domains. In
particular, we evaluate the advantages of a broad set of ensemble configurations
in terms of space and time efficiency in both parallel and sequential time models.
Our results show that ensembles are an effective way to improve performance
given a parallel model, can significantly reduce space requirements and in some
cases may improve performance in a sequential model. Additionally, from our
work we produced an open-source planning library.
Advisors/Committee Members: Fern, Alan (advisor), Fern, Xiaoli (committee member).
Subjects/Keywords: planning; Monte Carlo method
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APA ·
Chicago ·
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Manager
APA (6th Edition):
Lewis, P. (. A. (2010). Ensemble Monte-Carlo planning : an empirical study. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/16472
Chicago Manual of Style (16th Edition):
Lewis, Paul (Paul Arthur). “Ensemble Monte-Carlo planning : an empirical study.” 2010. Masters Thesis, Oregon State University. Accessed April 14, 2021.
http://hdl.handle.net/1957/16472.
MLA Handbook (7th Edition):
Lewis, Paul (Paul Arthur). “Ensemble Monte-Carlo planning : an empirical study.” 2010. Web. 14 Apr 2021.
Vancouver:
Lewis P(A. Ensemble Monte-Carlo planning : an empirical study. [Internet] [Masters thesis]. Oregon State University; 2010. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1957/16472.
Council of Science Editors:
Lewis P(A. Ensemble Monte-Carlo planning : an empirical study. [Masters Thesis]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/16472
University of Ontario Institute of Technology
18.
Lu, Yi.
Monte-Carlo-simulation-based performance analysis of the heat transfer process in nuclear-based hydrogen production based on Cu-Cl Cycle.
Degree: 2014, University of Ontario Institute of Technology
URL: http://hdl.handle.net/10155/454
► As a crucial step in nuclear-based hydrogen production based on Cu-Cl cycle, the performance analysis of heat transfer process is of paramount importance. However, as…
(more)
▼ As a crucial step in nuclear-based hydrogen production based on Cu-Cl cycle, the performance analysis of heat transfer process is of paramount importance. However, as a newly built system, the major obstacle of applying standard performance analysis to the heat transfer process is the sparse data. In this thesis, the methodology of
Monte-
Carlo Simulation-based (MCS-based) performance analysis is developed, and it is shown that this method can be used to deal effectively with the problems caused by sparse data in the heat transfer process. This method expanded the database successfully and carried out the
Monte-
Carlo simulation through expanded database. The details of the heat transfer process in a nuclear-based hydrogen production based on a four-step Cu-Cl cycle is firstly listed and discussed. Afterwards, the modelling of the MCS-based performance analysis of heat transfer process is proposed and explained step by step. The confidence interval of the simulation results is demonstrated since the variations in results is a major issue for any performance analysis based on simulations. The final result indicated that the MCS-based performance analysis is a reasonable performance analysis method that can be used to evaluate the performance of the heat transfer process in the nuclear-based hydrogen production based on Cu-Cl cycle through sparse data.
Advisors/Committee Members: Lu, Lixuan.
Subjects/Keywords: Monte-Carlo simulation; Performance analysis
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APA ·
Chicago ·
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APA (6th Edition):
Lu, Y. (2014). Monte-Carlo-simulation-based performance analysis of the heat transfer process in nuclear-based hydrogen production based on Cu-Cl Cycle. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/454
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lu, Yi. “Monte-Carlo-simulation-based performance analysis of the heat transfer process in nuclear-based hydrogen production based on Cu-Cl Cycle.” 2014. Thesis, University of Ontario Institute of Technology. Accessed April 14, 2021.
http://hdl.handle.net/10155/454.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lu, Yi. “Monte-Carlo-simulation-based performance analysis of the heat transfer process in nuclear-based hydrogen production based on Cu-Cl Cycle.” 2014. Web. 14 Apr 2021.
Vancouver:
Lu Y. Monte-Carlo-simulation-based performance analysis of the heat transfer process in nuclear-based hydrogen production based on Cu-Cl Cycle. [Internet] [Thesis]. University of Ontario Institute of Technology; 2014. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/10155/454.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lu Y. Monte-Carlo-simulation-based performance analysis of the heat transfer process in nuclear-based hydrogen production based on Cu-Cl Cycle. [Thesis]. University of Ontario Institute of Technology; 2014. Available from: http://hdl.handle.net/10155/454
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université de Neuchâtel
19.
Glenz, Damian.
Inverse modeling of groundwater flow in the Rhône alluvial
aquifer - impact of the Third Rhône correction.
Degree: 2013, Université de Neuchâtel
URL: http://doc.rero.ch/record/32933
► Le principal objectif de cette thèse est l’évaluation quantitative de l’impact de la troisième correction du Rhône (PR3) sur l’aquifère alluvial de la plaine du…
(more)
▼ Le principal objectif de cette thèse est l’évaluation
quantitative de l’impact de la troisième correction du Rhône (PR3)
sur l’aquifère alluvial de la plaine du Rhône. Le PR3 est un projet
d’aménagement, dont le but est d’une part l’amélioration de la
protection contre les inondations, et d’autre part la
renaturalisation du lit de la rivière Rhône (Valais, Suisse).
L’approche considérée pour améliorer la capacité de drainage du
Rhône est l’élargissement du lit de la rivière, ce qui causera un
abaissement du niveau de la rivière (d’environ 0.9m en moyenne).
L’impact du PR3 sur les eaux souterraines a été estimé
avec un modèle numérique d’écoulement permanent. Ce modèle a été
calibré avec des données de charge hydraulique. Le modèle numérique
permet d’intégrer les données existantes, et d’étudier ensuite le
comportement possible du système lorsqu’il sera soumis à des
conditions qui diffèrent de celles investiguées actuellement (état
restauré). Quand le modèle est utilisé pour simuler l’état futur du
système, ses prévisions contiennent nécessairement un certain degré
d’incertitude. Deux sources d’incertitude ont été considérées dans
ce travail : d’une part la non-unicité de la solution du problème
inverse, qui consiste à estimer les paramètres du modèle sur la
base des mesures disponibles de charge hydraulique; d’autre part
l’incertitude concernant l’évolution de la conductivité hydraulique
du lit du Rhône suite à la restauration. L’incertitude sur les
prévisions découlant de la non-unicité du problème inverse a été
traitée grâce à la méthode du “null Space
Monte Carlo” (NSMC)
implémentée dans PEST. L’incertitude induite par l’état futur
incertain du lit du Rhône a été traitée avec une analyse de
sensibilité des prévisions par rapport à la conductivité du lit de
la rivière. Le modèle est basé sur une compréhension
conceptuelle du système, acquise grâce à l’interprétation des
données disponibles. Ces données suggèrent clairement que le
système est fortement contrôlé par des paramètres à l’échelle
régionale, et que les interactions de l’eau souterraine avec le
Rhône, ainsi qu’avec les canaux, joue un rôle clé dans le
fonctionnement de l’aquifère. Le modèle est cohérent
avec les données mesurées sur le terrain (charge hydraulique, zones
d’échanges entre eau de surface et nappe phréatique, flux d’échange
dans les canaux). Un résultat inattendu du modèle est que les zones
d’échanges importants entre eaux superficielles et souterraines se
produit sur de brefs tronçon du Rhône et à proximité des gravières
et des carrières dans le lit de la rivière. En supposant
que les propriétés du fond du lit du Rhône vont revenir à un état
stable et identique à l’état actuel (ce qui implique le
développement d’une couche de colmatation), le modèle prévoit que,
à terme, le niveau d’eau s’abaisse à cause du PR3. Les résultats de
modélisation suggèrent aussi que les canaux de drainage vont
considérablement atténuer l’influence de la restauration du Rhône,
et réduisent de plus l’incertitude sur les prévisions. …
Advisors/Committee Members: Philippe (Dir.), Pierre (Codir.).
Subjects/Keywords: null space Monte Carlo
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Glenz, D. (2013). Inverse modeling of groundwater flow in the Rhône alluvial
aquifer - impact of the Third Rhône correction. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/32933
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Glenz, Damian. “Inverse modeling of groundwater flow in the Rhône alluvial
aquifer - impact of the Third Rhône correction.” 2013. Thesis, Université de Neuchâtel. Accessed April 14, 2021.
http://doc.rero.ch/record/32933.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Glenz, Damian. “Inverse modeling of groundwater flow in the Rhône alluvial
aquifer - impact of the Third Rhône correction.” 2013. Web. 14 Apr 2021.
Vancouver:
Glenz D. Inverse modeling of groundwater flow in the Rhône alluvial
aquifer - impact of the Third Rhône correction. [Internet] [Thesis]. Université de Neuchâtel; 2013. [cited 2021 Apr 14].
Available from: http://doc.rero.ch/record/32933.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Glenz D. Inverse modeling of groundwater flow in the Rhône alluvial
aquifer - impact of the Third Rhône correction. [Thesis]. Université de Neuchâtel; 2013. Available from: http://doc.rero.ch/record/32933
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Debrecen
20.
Biró, Gábor.
Opciók árazása Monte Carlo szimulációval
.
Degree: DE – TEK – Informatikai Kar, 2013, University of Debrecen
URL: http://hdl.handle.net/2437/170536
► Opciók árazása Monte Carlo szimulációvalMagyar Telekom részvényeiből becsültem meg a historikus volatlitás értéket október 28. és január 28. közötti időre vonatkozóan. A kapott volatilitás érték…
(more)
▼ Opciók árazása
Monte Carlo szimulációvalMagyar Telekom részvényeiből becsültem meg a historikus volatlitás értéket október 28. és január 28. közötti időre vonatkozóan. A kapott volatilitás érték 21,41%. Ezt a volatilitás értéket felhasználva beáraztam a put opciót.
A következő részben a Hull & White modellel árazom be a fent említett put opciót, először 19,95% és 21,41 %-os volatilitást alkalmazva.
A Duan modellel alkalmazott szimuláció esetén, alkalmazva az átlaghoz való visszahúzást,majd a Duan modellel alkalmazott opció esetén az opciós díj magasabb, mint a Bs ár, ha azt feltételezzük, hogy GARCH folyamatú a részvény pályája.
Ugyanezt megtettem a Heston-Nandai modell esetében is.
Az utolsó fejezetben egzotikus opciók, speciálisan Barrier opció esetén szemléltettem a modellek közötti különbségeket, hiszen itt jelentős eltéréseket lehet tapasztalni. Természetesen nem célom meghatározni, hogy melyik modell alkalmazása a helyes, csupán a modell használatból származó eltéréseket kívánom szemléltetni
Advisors/Committee Members: Gáll, József (advisor).
Subjects/Keywords: opció, Monte Carlo;
árazás
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Biró, G. (2013). Opciók árazása Monte Carlo szimulációval
. (Thesis). University of Debrecen. Retrieved from http://hdl.handle.net/2437/170536
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Biró, Gábor. “Opciók árazása Monte Carlo szimulációval
.” 2013. Thesis, University of Debrecen. Accessed April 14, 2021.
http://hdl.handle.net/2437/170536.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Biró, Gábor. “Opciók árazása Monte Carlo szimulációval
.” 2013. Web. 14 Apr 2021.
Vancouver:
Biró G. Opciók árazása Monte Carlo szimulációval
. [Internet] [Thesis]. University of Debrecen; 2013. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/2437/170536.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Biró G. Opciók árazása Monte Carlo szimulációval
. [Thesis]. University of Debrecen; 2013. Available from: http://hdl.handle.net/2437/170536
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
Seth, Priyanka.
Improved wave functions for quantum Monte Carlo.
Degree: PhD, 2013, University of Cambridge
URL: http://www.dspace.cam.ac.uk/handle/1810/244333https://www.repository.cam.ac.uk/bitstream/1810/244333/2/license.txt
;
https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt
;
https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt
;
https://www.repository.cam.ac.uk/bitstream/1810/244333/5/PS_thesis_electronic.pdf.txt
;
https://www.repository.cam.ac.uk/bitstream/1810/244333/6/PS_thesis_electronic.pdf.jpg
► Quantum Monte Carlo (QMC) methods can yield highly accurate energies for correlated quantum systems. QMC calculations based on many-body wave functions are considerably more accurate…
(more)
▼ Quantum Monte Carlo (QMC) methods can yield highly accurate energies
for correlated quantum systems. QMC calculations based on many-body
wave functions are considerably more accurate than density
functional theory methods, and their accuracy rivals that of
the most sophisticated quantum chemistry methods. This thesis
is concerned with the development of improved wave function
forms and their use in performing highly-accurate quantum Monte
Carlo calculations.
All-electron variational and diffusion Monte Carlo (VMC and DMC)
calculations are performed for the first-row atoms and
singly-positive ions. Over 98% of the correlation energy
is retrieved at the VMC level and over 99% at the DMC level
for all the atoms and ions. Their first ionization potentials
are calculated within chemical accuracy. Scalar relativistic
corrections to the energies, mass-polarization terms, and one-
and two-electron expectation values are also evaluated. A form
for the electron and intracule densities is presented and fits
to this form are performed.
Typical Jastrow factors used in quantum Monte Carlo calculations
comprise electron-electron, electron-nucleus and
electron-electron-nucleus terms. A general Jastrow factor
capable of correlating an arbitrary of number of electrons and
nuclei, and including anisotropy is outlined. Terms that depend
on the relative orientation of electrons are also introduced and
applied. This Jastrow factor is applied to electron gases, atoms
and molecules and is found to give significant improvement at
both VMC and DMC levels.
Similar generalizations to backflow transformations will
allow useful additional variational freedom in the wave
function. In particular, the use of different backflow functions
for different orbitals is expected to be important in systems
where the orbitals are qualitatively different. The modifications
to the code necessary to accommodate orbital-dependent backflow
functions are described and some systems in which they are
expected to be important are suggested.
Subjects/Keywords: Electronic structure; Quantum Monte Carlo
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Seth, P. (2013). Improved wave functions for quantum Monte Carlo. (Doctoral Dissertation). University of Cambridge. Retrieved from http://www.dspace.cam.ac.uk/handle/1810/244333https://www.repository.cam.ac.uk/bitstream/1810/244333/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/5/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/6/PS_thesis_electronic.pdf.jpg
Chicago Manual of Style (16th Edition):
Seth, Priyanka. “Improved wave functions for quantum Monte Carlo.” 2013. Doctoral Dissertation, University of Cambridge. Accessed April 14, 2021.
http://www.dspace.cam.ac.uk/handle/1810/244333https://www.repository.cam.ac.uk/bitstream/1810/244333/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/5/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/6/PS_thesis_electronic.pdf.jpg.
MLA Handbook (7th Edition):
Seth, Priyanka. “Improved wave functions for quantum Monte Carlo.” 2013. Web. 14 Apr 2021.
Vancouver:
Seth P. Improved wave functions for quantum Monte Carlo. [Internet] [Doctoral dissertation]. University of Cambridge; 2013. [cited 2021 Apr 14].
Available from: http://www.dspace.cam.ac.uk/handle/1810/244333https://www.repository.cam.ac.uk/bitstream/1810/244333/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/5/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/6/PS_thesis_electronic.pdf.jpg.
Council of Science Editors:
Seth P. Improved wave functions for quantum Monte Carlo. [Doctoral Dissertation]. University of Cambridge; 2013. Available from: http://www.dspace.cam.ac.uk/handle/1810/244333https://www.repository.cam.ac.uk/bitstream/1810/244333/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/3/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/5/PS_thesis_electronic.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244333/6/PS_thesis_electronic.pdf.jpg
University of Edinburgh
22.
Zhang, Yichuan.
Scalable geometric Markov chain Monte Carlo.
Degree: PhD, 2016, University of Edinburgh
URL: http://hdl.handle.net/1842/20978
► Markov chain Monte Carlo (MCMC) is one of the most popular statistical inference methods in machine learning. Recent work shows that a significant improvement of…
(more)
▼ Markov chain Monte Carlo (MCMC) is one of the most popular statistical inference methods in machine learning. Recent work shows that a significant improvement of the statistical efficiency of MCMC on complex distributions can be achieved by exploiting geometric properties of the target distribution. This is known as geometric MCMC. However, many such methods, like Riemannian manifold Hamiltonian Monte Carlo (RMHMC), are computationally challenging to scale up to high dimensional distributions. The primary goal of this thesis is to develop novel geometric MCMC methods applicable to large-scale problems. To overcome the computational bottleneck of computing second order derivatives in geometric MCMC, I propose an adaptive MCMC algorithm using an efficient approximation based on Limited memory BFGS. I also propose a simplified variant of RMHMC that is able to work effectively on larger scale than the previous methods. Finally, I address an important limitation of geometric MCMC, namely that is only available for continuous distributions. I investigate a relaxation of discrete variables to continuous variables that allows us to apply the geometric methods. This is a new direction of MCMC research which is of potential interest to many applications. The effectiveness of the proposed methods is demonstrated on a wide range of popular models, including generalised linear models, conditional random fields (CRFs), hierarchical models and Boltzmann machines.
Subjects/Keywords: 519.2; Monte Carlo method
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APA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhang, Y. (2016). Scalable geometric Markov chain Monte Carlo. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/20978
Chicago Manual of Style (16th Edition):
Zhang, Yichuan. “Scalable geometric Markov chain Monte Carlo.” 2016. Doctoral Dissertation, University of Edinburgh. Accessed April 14, 2021.
http://hdl.handle.net/1842/20978.
MLA Handbook (7th Edition):
Zhang, Yichuan. “Scalable geometric Markov chain Monte Carlo.” 2016. Web. 14 Apr 2021.
Vancouver:
Zhang Y. Scalable geometric Markov chain Monte Carlo. [Internet] [Doctoral dissertation]. University of Edinburgh; 2016. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1842/20978.
Council of Science Editors:
Zhang Y. Scalable geometric Markov chain Monte Carlo. [Doctoral Dissertation]. University of Edinburgh; 2016. Available from: http://hdl.handle.net/1842/20978
National University of Ireland – Galway
23.
Conneely, Elaine.
A Monte Carlo Investigation in External Beam Radiotherapy
.
Degree: 2011, National University of Ireland – Galway
URL: http://hdl.handle.net/10379/2619
► Monte Carlo techniques have been shown to be the most accurate method of modelling radiation transport and dose deposition. With increasingly complex radiotherapy techniques being…
(more)
▼ Monte Carlo techniques have been shown to be the most accurate method of
modelling radiation transport and dose deposition. With increasingly complex
radiotherapy techniques being employed in the continuing fight against cancer,
Monte Carlo techniques provide a de finitive method to assess the accuracy of
these techniques and the accuracy of the procedures used to test them. This
thesis established a method to tune a linear accelerator model, in an efficient
process. This model was then employed to examine two techniques used currently
in the measurement of the absolute dose for the quality assurance of individual
patient IMRT plans.
Advisors/Committee Members: Foley, Mark J (advisor).
Subjects/Keywords: Radiotherapy;
Monte Carlo;
IMRT;
Physics
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Conneely, E. (2011). A Monte Carlo Investigation in External Beam Radiotherapy
. (Thesis). National University of Ireland – Galway. Retrieved from http://hdl.handle.net/10379/2619
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Conneely, Elaine. “A Monte Carlo Investigation in External Beam Radiotherapy
.” 2011. Thesis, National University of Ireland – Galway. Accessed April 14, 2021.
http://hdl.handle.net/10379/2619.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Conneely, Elaine. “A Monte Carlo Investigation in External Beam Radiotherapy
.” 2011. Web. 14 Apr 2021.
Vancouver:
Conneely E. A Monte Carlo Investigation in External Beam Radiotherapy
. [Internet] [Thesis]. National University of Ireland – Galway; 2011. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/10379/2619.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Conneely E. A Monte Carlo Investigation in External Beam Radiotherapy
. [Thesis]. National University of Ireland – Galway; 2011. Available from: http://hdl.handle.net/10379/2619
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Buchholz, Alexander.
High dimensional Bayesian computation : Computation bayésienne en grande dimension.
Degree: Docteur es, Mathématiques appliquées, 2018, Université Paris-Saclay (ComUE)
URL: http://www.theses.fr/2018SACLG004
► La statistique bayésienne computationnelle construit des approximations de la distribution a posteriori soit par échantillonnage, soit en construisant des approximations tractables. La contribution de cette…
(more)
▼ La statistique bayésienne computationnelle construit des approximations de la distribution a posteriori soit par échantillonnage, soit en construisant des approximations tractables. La contribution de cette thèse au domaine des statistiques bayésiennes est le développement de nouvelle méthodologie en combinant des méthodes existantes. Nos approches sont mieux adaptées à la dimension ou entraînent une réduction du coût de calcul par rapport aux méthodes existantes.Notre première contribution améliore le calcul bayésien approximatif (ABC) en utilisant le quasi-Monte Carlo (QMC). ABC permet l'inférence bayésienne dans les modèles avec une vraisemblance intractable. QMC est une technique de réduction de variance qui fournit des estimateurs plus précis d’intégrales. Notre deuxième contribution utilise le QMC pour l'inférence variationnelle(VI). VI est une méthode pour construire des approximations tractable à la distribution a posteriori . La troisième contribution développe une approche pour adapter les échantillonneurs Monte Carlo séquentiel (SMC) lorsque on utilise des noyaux de mutation Hamiltonian MonteCarlo (HMC). Les échantillonneurs SMC permettent une estimation non biaisée de l’évidence du modèle, mais ils ont tendance à perdre en performance lorsque la dimension croit. HMC est une technique de Monte Carlo par chaîne de Markov qui présente des propriétés intéressantes lorsque la dimension de l'espace cible augmente mais elle est difficile à adapter. En combinant les deux,nous construisons un échantillonneur qui tire avantage des deux.
Computational Bayesian statistics builds approximations to the posterior distribution either bysampling or by constructing tractable approximations. The contribution of this thesis to the fieldof Bayesian statistics is the development of new methodology by combining existing methods. Ourapproaches either scale better with the dimension or result in reduced computational cost com-pared to existing methods. Our first contribution improves approximate Bayesian computation(ABC) by using quasi-Monte Carlo (QMC). ABC allows Bayesian inference in models with in-tractable likelihoods. QMC is a variance reduction technique that yields precise estimations ofintegrals. Our second contribution takes advantage of QMC for Variational Inference (VI). VIis a method for constructing tractable approximations to the posterior distribution. The thirdcontribution develops an approach for tuning Sequential Monte Carlo (SMC) samplers whenusing Hamiltonian Monte Carlo (HMC) mutation kernels. SMC samplers allow the unbiasedestimation of the model evidence but tend to struggle with increasing dimension. HMC is aMarkov chain Monte Carlo technique that has appealing properties when the dimension of thetarget space increases but is difficult to tune. By combining the two we construct a sampler thattakes advantage of the two.
Advisors/Committee Members: Chopin, Nicolas (thesis director).
Subjects/Keywords: Monte Carlo sequentiel; Statistique bayesienne; Quasi Monte Carlo; Sequential Monte Carlo; Bayesian statistics; Quasi Monte Carlo; 519;
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APA (6th Edition):
Buchholz, A. (2018). High dimensional Bayesian computation : Computation bayésienne en grande dimension. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2018SACLG004
Chicago Manual of Style (16th Edition):
Buchholz, Alexander. “High dimensional Bayesian computation : Computation bayésienne en grande dimension.” 2018. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed April 14, 2021.
http://www.theses.fr/2018SACLG004.
MLA Handbook (7th Edition):
Buchholz, Alexander. “High dimensional Bayesian computation : Computation bayésienne en grande dimension.” 2018. Web. 14 Apr 2021.
Vancouver:
Buchholz A. High dimensional Bayesian computation : Computation bayésienne en grande dimension. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2018. [cited 2021 Apr 14].
Available from: http://www.theses.fr/2018SACLG004.
Council of Science Editors:
Buchholz A. High dimensional Bayesian computation : Computation bayésienne en grande dimension. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2018. Available from: http://www.theses.fr/2018SACLG004
University of Waikato
25.
Zakariah, Suhaili.
Fast Monte Carlo Simulation of ⁹⁰Y Bremsstrahlung using a Kernel-based Photon Source
.
Degree: 2011, University of Waikato
URL: http://hdl.handle.net/10289/5549
► In targeted radionuclide therapy using ⁹⁰Y, bremsstrahlung photons can be used for imaging and subsequently for absorbed dose estimation. Monte Carlo simulation is a reliable…
(more)
▼ In targeted radionuclide therapy using ⁹⁰Y, bremsstrahlung photons can be used for imaging and subsequently for absorbed dose estimation.
Monte Carlo simulation is a reliable method to study bremsstrahlung imaging but it takes a long computation time as not all ⁹⁰Y disintegrations result in emission of a bremsstrahlung photon. Furthermore the electron transport simulation is particularly time consuming. This research proposes that bremsstrahlung photons produced from the decay of a ⁹⁰Y point source are replaced with a kernel-based photon source for faster
Monte Carlo simulation.
This study is divided into three main parts. First, a ⁹⁰Y point source in a spherical water phantom is fully simulated using
Monte Carlo simulation. The characteristics of the bremsstrahlung photons produced from the ⁹⁰Y decay are investigated. The full
Monte Carlo simulation of ⁹⁰Y point source provides the relationships between the emission position, energy and emission angle of the bremsstrahlung photon. These are recorded as probability distribution functions (PDFs).
Then, a kernel-based photon source which comprises of an array of photon-emitting concentric spherical shells is developed. The energy spectrum and angular distributions of the emitted photons are defined for each shell using the PDFs obtained previously from the full ⁹⁰Y
Monte Carlo simulation. The kernel-based photon source shows a very close approximation to the distribution of bremsstrahlung photons generated by the full
Monte Carlo simulation of ⁹⁰Y point source if the shells are sufficiently closely spaced.
Finally, the accuracy and speed of the kernel-based photon source are evaluated. A simplified gamma camera model, which consists of a collimator and NaI(Tl) detector is simulated to obtain the point spread function (PSF) of the point source ‘image’. The PSF can be represented as a Gaussian function. Estimation of σ of the Gaussian function and thus the full-width half-maximum (FWHM) is used to compare the different kernel-based photon source models to represent a ‘real’ source generated by a full
Monte Carlo ⁹⁰Y simulation. The results show that the FWHMs of the photon source with kernels are comparable to full
Monte Carlo simulation of ⁹⁰Y point source. The FWHM determined for a photon point source with the spectrum of ⁹⁰Y bremsstrahlung underestimates the full
Monte Carlo simulation of the true ⁹⁰Y point source. This demonstrates that it is important to account for the photons being emitted at a distance away from the source and all of the photons cannot be assumed to come from a single point. It is more computationally efficient to use this source model than the kernel-based photon sources as it has the shortest computation time, however it is quite inaccurate. Simplifying the kernel-based source by assuming the photon emission as isotropic reduces the accuracy of the model slightly, though the reduction in simulation time is sufficiently small that the more accurate anisotropic kernel should be preferred.
The kernel-based photon source proposed in this study…
Advisors/Committee Members: Round, W. Howell (advisor), Cree, Michael J (advisor).
Subjects/Keywords: Monte Carlo;
⁹⁰Y;
simulation
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zakariah, S. (2011). Fast Monte Carlo Simulation of ⁹⁰Y Bremsstrahlung using a Kernel-based Photon Source
. (Doctoral Dissertation). University of Waikato. Retrieved from http://hdl.handle.net/10289/5549
Chicago Manual of Style (16th Edition):
Zakariah, Suhaili. “Fast Monte Carlo Simulation of ⁹⁰Y Bremsstrahlung using a Kernel-based Photon Source
.” 2011. Doctoral Dissertation, University of Waikato. Accessed April 14, 2021.
http://hdl.handle.net/10289/5549.
MLA Handbook (7th Edition):
Zakariah, Suhaili. “Fast Monte Carlo Simulation of ⁹⁰Y Bremsstrahlung using a Kernel-based Photon Source
.” 2011. Web. 14 Apr 2021.
Vancouver:
Zakariah S. Fast Monte Carlo Simulation of ⁹⁰Y Bremsstrahlung using a Kernel-based Photon Source
. [Internet] [Doctoral dissertation]. University of Waikato; 2011. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/10289/5549.
Council of Science Editors:
Zakariah S. Fast Monte Carlo Simulation of ⁹⁰Y Bremsstrahlung using a Kernel-based Photon Source
. [Doctoral Dissertation]. University of Waikato; 2011. Available from: http://hdl.handle.net/10289/5549
University of Victoria
26.
Townson, Reid William.
Enhancing the speed of radiotherapy Monte Carlo dose calculation with applications in dose verification.
Degree: Department of Physics and Astronomy, 2015, University of Victoria
URL: http://hdl.handle.net/1828/5983
► Monte Carlo (MC) methods for radiotherapy dose calculation are widely accepted as capable of achieving high accuracy. In particular, MC calculations have been demonstrated to…
(more)
▼ Monte Carlo (MC) methods for radiotherapy dose calculation are widely accepted
as capable of achieving high accuracy. In particular, MC calculations have been
demonstrated to successfully reproduce measured dose distributions in complex situations where alternative dose calculation algorithms failed (for example, regions of
charged particle disequilibrium). For this reason, MC methods are likely to play
a central role in radiotherapy dose calculations and dose verification in the future.
However, clinical implementations of MC calculations have typically been limited due
to the high computational demands. In order to improve the feasibility of using MC
simulations clinically, the simulation techniques must be made more efficient.
This dissertation presents a number of approaches to improve the efficiency of
MC dose calculations. One of the most time consuming parts of source modeling
is the simulation of the secondary collimators, which absorb particles to define the
rectangular boundaries of radiation fields. The approximation of assuming negligible
transmission through and scatter from the secondary collimators was evaluated for
accuracy and efficiency using both graphics processing unit (GPU)-based and central processing unit (CPU)-based MC approaches. The new dose calculation engine,
gDPM, that utilizes GPUs to perform MC simulations was developed to a state where
accuracy comparable to conventional MC algorithms was attained. However, in GPU-
based dose calculation, source modeling was found to be an efficiency bottleneck. To
address this, a sorted phase-space source model was implemented (the phase-space-
let, or PSL model), as well as a hybrid source model where a phase-space source was
used only for extra-focal radiation and a point source modeled focal source photons.
All of these methods produced results comparable with standard CPU-based MC
simulations in minutes, rather than hours, of calculation time. While maintaining
reasonable accuracy, the hybrid source model increased source generation time by a
factor of ~2-5 when compared with the PSL source model. A variance reduction
technique known as photon splitting was also implemented into gDPM, to evaluate
its effectiveness at reducing simulation times in GPU calculations.
Finally, an alternative CPU-based MC dose calculation technique was presented
for specific applications in pre-treatment dose verification. The method avoids the
requirement of plan-specific MC simulations. Using measurements from an electronic
portal imaging device (EPID), pre-calculated MC beamlets in a spherical water phantom were modulated to obtain a dose reconstruction.
Advisors/Committee Members: Zavgorodni, Sergei (supervisor), Jirasek, Andrew (supervisor).
Subjects/Keywords: Medical physics; Radiotherapy; Monte Carlo
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Manager
APA (6th Edition):
Townson, R. W. (2015). Enhancing the speed of radiotherapy Monte Carlo dose calculation with applications in dose verification. (Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/5983
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Townson, Reid William. “Enhancing the speed of radiotherapy Monte Carlo dose calculation with applications in dose verification.” 2015. Thesis, University of Victoria. Accessed April 14, 2021.
http://hdl.handle.net/1828/5983.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Townson, Reid William. “Enhancing the speed of radiotherapy Monte Carlo dose calculation with applications in dose verification.” 2015. Web. 14 Apr 2021.
Vancouver:
Townson RW. Enhancing the speed of radiotherapy Monte Carlo dose calculation with applications in dose verification. [Internet] [Thesis]. University of Victoria; 2015. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1828/5983.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Townson RW. Enhancing the speed of radiotherapy Monte Carlo dose calculation with applications in dose verification. [Thesis]. University of Victoria; 2015. Available from: http://hdl.handle.net/1828/5983
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Vienna
27.
Schauberger, Carolin.
Monte-Carlo Simulation.
Degree: 2020, University of Vienna
URL: http://othes.univie.ac.at/61104/
► Die Monte-Carlo Simulation ist nicht nur in der Mathematik, sondern auch in den Natur- und Wirtschaftswissenschaften weit verbreitet. Damit können einerseits stochastische Probleme (z.B. Value…
(more)
▼ Die Monte-Carlo Simulation ist nicht nur in der Mathematik, sondern auch in
den Natur- und Wirtschaftswissenschaften weit verbreitet. Damit können einerseits
stochastische Probleme (z.B. Value at Risk) und andererseits deterministische
Fragestellungen (z.B. Strahlungstransfer durch die Atmosphäre) berechnet
werden.
Anhand einiger einfacher stochastischer Experimente mit Münze und Würfel werden
die Grundzüge der Monte-Carlo Simulation exemplarisch dargestellt. Dazu
wird der notwendige Formelapparat und die theoretischen Grundlagen für den
Lehrkörper behandelt. Darauf aufbauend werden die stochastischen Experimente
erklärt und exemplarisch diskutiert.
In der Diplomarbeit werden ausgehend von den relevanten Begriffen der Wahrscheinlichkeitstheorie
die diskreten und stetigen Zufallsvariablen und deren Verteilungen
behandelt. Weiters werden noch ausgewählte Wahrscheinlichkeitsverteilungen
erläutert. Außerdem wird der Begriff der Zufallszahl, sowie die Erzeugung
von Zufallszahlen mit Hilfe von Generatoren behandelt. Neben physikalischen Verfahren
werden auch mathematische Methoden beschrieben, um Zufallszahlen beziehungsweise
Pseudozufallszahlen zu erzeugen. Darauffolgend werden unterschiedliche
Tests von Zufallszahlen, mit deren Hilfe es möglich ist die theoretischen Anforderungen
zu überprüfen, bearbeitet. Weiters werden verschiedenen Transformationen
von Zufallszahlen behandelt. Diese beschäftigen sich damit, wie gleichverteilte
Zufallszahlen in beliebig verteilte Zufallszahlen übergeführt werden können.
Im letzten Abschnitt wird die Simulation von Zufallszahlen im Unterricht, sowie
Anwendungsbeispiele im Unterricht behandelt. Dabei werden verschiedene Fragestellungen
mit unterschiedlichen Schwierigkeitsgraden aufbauend erklärt. Solch
ein Anwendungsbeispiel gliedert sich in folgende drei Bereiche: Problemstellung,
Theorie und Durchführung des Experiments. Bei der Durchführung wird einerseits
das Experiment in der Klasse beschrieben und andererseits die exemplarische
Auswertung mit Hilfe eines Tabellenkalkulationsprogramms dargestellt.
The Monte-Carlo Simulation is not only prevalent in the world of mathematics, but
it is also widespread in other natural sciences and economics. Stochastic problems
(e.g. value-at-risk calculations) as well as deterministic questions (e.g. radiation
through the atmosphere) can be therewith resolved.
The fundamentals of the Monte-Carlo Simulation are here illustrated through simple
stochastic experiments with coins and dice. Underlying formulas and theoretical
principles for the use by teachers and lecturers are covered and the stochastic
experiments explained and discussed.
The relevant terms and concepts of probability theory, discrete and continuous
random variables and their distribution are studied in this thesis, with selected
probability distributions examined in more detail. The term of random variable
and the generation of random variables are illustrated with the use of generators.
The generation of random variables and pseudo-random…
Subjects/Keywords: 31.70 Wahrscheinlichkeitsrechnung; Monte-Carlo Simulation
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APA ·
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Export
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Manager
APA (6th Edition):
Schauberger, C. (2020). Monte-Carlo Simulation. (Thesis). University of Vienna. Retrieved from http://othes.univie.ac.at/61104/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Schauberger, Carolin. “Monte-Carlo Simulation.” 2020. Thesis, University of Vienna. Accessed April 14, 2021.
http://othes.univie.ac.at/61104/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Schauberger, Carolin. “Monte-Carlo Simulation.” 2020. Web. 14 Apr 2021.
Vancouver:
Schauberger C. Monte-Carlo Simulation. [Internet] [Thesis]. University of Vienna; 2020. [cited 2021 Apr 14].
Available from: http://othes.univie.ac.at/61104/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Schauberger C. Monte-Carlo Simulation. [Thesis]. University of Vienna; 2020. Available from: http://othes.univie.ac.at/61104/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Missouri – Columbia
28.
Saldivar, Issac.
Direct simulation Monte Carlo for modeling spatially homogeneous multi-component aerosols.
Degree: 2018, University of Missouri – Columbia
URL: http://hdl.handle.net/10355/68938
► Nuclear aerosols generated under normal operational and post-accident reactor environments are of particular importance in estimation of the nuclear source term. Several light water reactor…
(more)
▼ Nuclear aerosols generated under normal operational and post-accident reactor environments are of particular importance in estimation of the nuclear source term. Several light water reactor aerosol containment experiments provided an experimental database for verification and validation of thermal-hydraulic and aerosol transport codes. The Direct Simulation
Monte Carlo (DSMC) technique has been shown to model multicomponent aerosol dynamics accurately while maintaining greater fidelity to actual aerosol physics than its sectional, moments, and finite element predecessors. This research focuses on the development of a comprehensive n-component source term code for modeling the behavior of aerosolized fission products based on the DSMC technique. Effective DSMC benchmarks provided further confidence in the technique's capabilities for modeling exceedingly complex systems. With the inclusion of the Knudsen, Kelvin, and solute effects in the Mason model, the role of condensation on aerosol evolution showed the differentiation of particles by physical size and chemical properties. High fidelity large-scale simulations posed evident but considerable challenges to computational runtime. Developments in the simulation scaling theory for coagulation, condensation, deposition, and generation processes showed to give comparable results while simultaneously reducing simulation time significantly. The evolution of aerosols coupled to environments was explored, and benchmark simulations provided further evidence that DSMC accurately models aerosol dynamics when coupled with containment thermal-hydraulics.
Advisors/Committee Members: Loyalka, Sudarshan K. (advisor).
Subjects/Keywords: Aerosols, Radioactive; Monte Carlo method
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Manager
APA (6th Edition):
Saldivar, I. (2018). Direct simulation Monte Carlo for modeling spatially homogeneous multi-component aerosols. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/68938
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Saldivar, Issac. “Direct simulation Monte Carlo for modeling spatially homogeneous multi-component aerosols.” 2018. Thesis, University of Missouri – Columbia. Accessed April 14, 2021.
http://hdl.handle.net/10355/68938.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Saldivar, Issac. “Direct simulation Monte Carlo for modeling spatially homogeneous multi-component aerosols.” 2018. Web. 14 Apr 2021.
Vancouver:
Saldivar I. Direct simulation Monte Carlo for modeling spatially homogeneous multi-component aerosols. [Internet] [Thesis]. University of Missouri – Columbia; 2018. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/10355/68938.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Saldivar I. Direct simulation Monte Carlo for modeling spatially homogeneous multi-component aerosols. [Thesis]. University of Missouri – Columbia; 2018. Available from: http://hdl.handle.net/10355/68938
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Urbana-Champaign
29.
Chen, Li.
Quantum Monte Carlo study of correlated electronic systems.
Degree: PhD, Physics, 2017, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/99333
► Describing correlated electron systems has been a major challenge in computational condensed-matter physics. Quantum Monte Carlo, a powerful computational tool for the study of correlated…
(more)
▼ Describing correlated electron systems has been a major challenge in computational condensed-matter physics. Quantum
Monte Carlo, a powerful computational tool for the study of correlated systems, solves electron correlation problems explicitly. It has been taken as a benchmark method for understanding the correlated systems. Instead of making approximations to Hamiltonian, QMC methods work with the wave functions, and the computational cost scales well with the system size. With the development of parallel computing, QMC calculations on large systems are becoming more and more feasible.
We have investigated two correlated systems with highly accurate fixed node QMC techniques. The first system is a correlated hydrogen model system near the metal to insulator transition. We have successfully identified the transition point by calculating spin and charge properties and analyzing the low energy Hilbert space. The second one is a strongly correlated Fe/O system. Calculations on the Fe atoms, O atoms, and FeO molecules are conducted with multiple highly accurate many-body techniques. The source of errors has been disentangled by comparing the results of the many body techniques with the experimental results. For the Fe and O atoms, the calculated properties coincide well with previous experimental results. For the basis-based techniques, the performance is mainly limited by the basis set. The calculated equilibrium bond length, excitation energy and vibrational frequency of the FeO molecules are also in close agreement with the known values from previous experiments.
Advisors/Committee Members: Wagner, Lucas K. (advisor), Ceperley, David M. (Committee Chair), Gollin, George D. (committee member), Abbamonte, Peter M. (committee member).
Subjects/Keywords: Quantum Monte Carlo; Correlated systems
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APA (6th Edition):
Chen, L. (2017). Quantum Monte Carlo study of correlated electronic systems. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/99333
Chicago Manual of Style (16th Edition):
Chen, Li. “Quantum Monte Carlo study of correlated electronic systems.” 2017. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021.
http://hdl.handle.net/2142/99333.
MLA Handbook (7th Edition):
Chen, Li. “Quantum Monte Carlo study of correlated electronic systems.” 2017. Web. 14 Apr 2021.
Vancouver:
Chen L. Quantum Monte Carlo study of correlated electronic systems. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/2142/99333.
Council of Science Editors:
Chen L. Quantum Monte Carlo study of correlated electronic systems. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/99333
University of New Mexico
30.
Templeton, Joseph.
SERPENT Modeling of the Transient Reactor Test Facility and Comparison with Measured Experimental Data.
Degree: Nuclear Engineering, 2015, University of New Mexico
URL: http://hdl.handle.net/1928/27971
► Following the events at the Fukushima Daiichi nuclear power plant complex on March 11th 2011, there is an increased need for research into accident tolerant…
(more)
▼ Following the events at the Fukushima Daiichi nuclear power plant complex on March 11th 2011, there is an increased need for research into accident tolerant light water reactor fuels. In addition to the need for accident tolerant fuels testing there is a rising demand for clean renewable energy and the design of many generation IV reactors to fill the role which will require testing of such reactors and their fuels. Calculations and simulations are vital for the development and initial testing of these fuels, however ultimately experiments must be performed that push the fuels to the limits of their safety margins and beyond thus providing proof of concept. The Transient Reactor Test (TREAT) Facility is designed to perform transient testing to support a basic understanding of nuclear fuel behavior under such off-normal conditions (Idaho National Laboratory, 2009). The TREAT Facility was an air cooled, graphite moderated, thermal spectrum reactor designed to test fast reactor fuels in over power and under cooling scenarios. The TREAT facility operated for 35 years. During this time the test facility conducted thousands of transients and hundreds of tests for a wide variety of reactor development programs and fuel types, with a distinguished history of producing significant safety experiment results (Crawford et al., 1999). Return to operable condition and resumption of testing is currently under consideration by the Department of Energy. TREAT could provide a facility for testing of high-bumup LWR elements, CANDU reactor elements, and innovative fuel element designs for reactors of the future. (Crawford et al., 1998) Reliable computer modeling of the TREAT reactor can be used to assist in the design and setup of experiments performed by the TREAT reactor. If transients can be accurately simulated using computer models then these can be compared to the current techniques for calculating the necessary parameters such as the number of fuel assemblies, control rod height and time required to achieve the desired total energy deposition in a test material. This additional information may help to confirm the validity of the predicted parameters. Additionally computer models of TREAT may be used in an effort to design LEU fuel assemblies to replace the HEU fuel assemblies currently used in the TREAT core.
Advisors/Committee Members: De Oliveira, Cassiano, McDaniel, Patrick, Busch, Robert.
Subjects/Keywords: SERPENT; TREAT; Monte Carlo
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APA (6th Edition):
Templeton, J. (2015). SERPENT Modeling of the Transient Reactor Test Facility and Comparison with Measured Experimental Data. (Masters Thesis). University of New Mexico. Retrieved from http://hdl.handle.net/1928/27971
Chicago Manual of Style (16th Edition):
Templeton, Joseph. “SERPENT Modeling of the Transient Reactor Test Facility and Comparison with Measured Experimental Data.” 2015. Masters Thesis, University of New Mexico. Accessed April 14, 2021.
http://hdl.handle.net/1928/27971.
MLA Handbook (7th Edition):
Templeton, Joseph. “SERPENT Modeling of the Transient Reactor Test Facility and Comparison with Measured Experimental Data.” 2015. Web. 14 Apr 2021.
Vancouver:
Templeton J. SERPENT Modeling of the Transient Reactor Test Facility and Comparison with Measured Experimental Data. [Internet] [Masters thesis]. University of New Mexico; 2015. [cited 2021 Apr 14].
Available from: http://hdl.handle.net/1928/27971.
Council of Science Editors:
Templeton J. SERPENT Modeling of the Transient Reactor Test Facility and Comparison with Measured Experimental Data. [Masters Thesis]. University of New Mexico; 2015. Available from: http://hdl.handle.net/1928/27971
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