Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"rare event"”.
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Rare-event searches with bolometers
Rare-event searches have played an integral part in the pursuit of physics beyond the Standard Model, offering us the chance to bridge the disparity between our current understanding and observed phenomena such as Dark Matter (DM) or the nature of neutrino masses. Over the last 30 years, these …
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Rare event simulation for probabilistic models of T-cell activation
… of this model. As T-cell activation is a rare event, that is the probability of T-cell activation is very low, we cannot analyze the model with the usual simple sampling strategies, but rely on the so-called importance sampling approach. With the help of large deviation theory we are able …
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A coupling approach to rare event simulation via dynamic importance sampling
Rare event simulation involves using Monte Carlo methods to estimate probabilities of unlikely events and to understand the dynamics of a system conditioned on a rare event. An established class of algorithms based on large deviations theory and control theory constructs provably asymptotically …
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Neural Network Methods for Improving Signal Processing in High-Purity Germanium Detectors for Rare Event Searches
… be used to improve signal processing in other rare event searches. More generally, the approach is applicable to one-dimensional waveforms in any domain where paired noisy observations are available, with no need for clean ground truth. This work is thus relevant both within and beyond the …
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Transition path sampling in organometallic catalysis: Overcoming the rare event problem in ab initio molecular dynamics
… is on the order of 100 ps. It is exceedingly rare for a chemical reaction to occur within this time scale, which precludes the use of straightforward AIMD simulations to study organometallic reaction dynamics or to calculate free energy barriers. We attempt to resolve this time scale …
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Analytical and computational methods for the study of rare event probabilities in dispersive and dissipative waves
… to calculate the probabilities associated with rare events in nonlinear, large-dimensional lightwave systems that are driven by noise, including models for fiber-based optical communication system and mode-locked lasers. Throughout the last decade, IS has emerged as a valuable tool for improving …
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How negative sampling provides class balance to rare event case data using a vehicular accident prediction project as a use case scenario
Rare event case data occur at such an infrequent rate that even having high amounts of it can leave researchers starving for more information. There has always existed a tug and pull relationship among rare event case data, where a higher count of entries often leads to a lack of explanatory …
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Three essays on debt pricing
… Consumer Credit Spread? An Explanation Based on Rare Event Risk and Belief Dispersion. What drives consumers borrowing/lending and the credit spread over their debt? This paper offers a novel explanation based on rare event risk and belief dispersion in a dynamic general equilibrium model. …
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Ab initio molecular dynamics simulations of lanthanide coordination structures in water and in faujasite
… aqua ions within ~1.1 pKa units using AIMD with rare event simulation techniques and electronic structure calculations. The capture of structural and reaction trends in the lanthanide aqua ion served as a benchmark for implementing similar methods in lanthanum-exchanged faujasite. In faujasite, …
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OPTIMAL SUBSEQUENCE BIJECTION AND CLASSIFICATION OF IMBALANCED DATA SETS
… to the data mining community. Often, it is the rare event that is of interest and the cost of misclassifying the rare event is higher than misclassifying the usual event. When the data is highly skewed toward the usual, it can be very difficult for a learning system to accurately detect the rare …
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Efficient Sampling Methods of, by, and for Stochastic Dynamical Systems
… In particular, quantifying the probabilities of rare events in SDEs -- and elucidating the mechanisms by which these events occur -- are critical to the design and safe operation of engineered systems. In the first part of the thesis, we use data-driven tools for dynamical systems to create …
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The COVID-19 crisis
… way of living and doing business. An extreme and rare event without precedent in modern times has put large parts of the global community on lockdown, resulting in major implications and disruptions for organizations all around the globe. This research examines how a global manufacturing company …
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Rare Events in Stochastic Systems: Modeling, Simulation Design and Algorithm Analysis
… explores a few topics in the study of rare events in stochastic systems, with a particular emphasis on the simulation aspect. This line of research has been receiving a substantial amount of interest in recent years, mainly motivated by scientific and industrial applications in which …
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Analysis of Continuous Tensor-Train Methods for Optimal Control Problems with the Ornstein-Uhlenbeck Operator
… multilevel splitting algorithms to investigate rare event probabilities related to stochastic dynamical systems and thereafter evaluate the variances and relative errors of the resulting statistical estimators. We also evaluate the efficacy of Compressed Continuous Computation in solving …
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Observation of mechanical bound states in the continuum
… the potential for high sensitivity sensing for rare-event searches and the exploration of the foundations of quantum mechanics in unreached parameter spaces.
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The Markov chain Monte Carlo approach to importance sampling in stochastic programming
… those with increased variance, multimodal or rare-event distributions.
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Search for Baryon Number Violation in Tellurium-130 with CUORE
… of the detectors at CUORE also allow for other rare event searches. This thesis describes an experimental analysis undertaken to search for baryon number violation in 130Te using the data acquired by the CUORE detector. The conservation of the baryon number in the Standard Model relies on an …
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Artificial intelligence and protein engineering : information theoretical approaches to modeling enzymatic catalysis
… computational sampling techniques, especially rare-event sampling methods like Transition Path Sampling, we can now generate large datasets of reactive and non-reactive enzyme trajectories. However, due to the high dimensionality of phase space, as well as the highly correlated nature of …
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Design Of A High Luminosity 100 Tev Proton Antiproton Collider
… in superconducting magnets and the number of events per bunch crossing, because lower beam currents can produce the same rare event rates. Events are also more centrally produced, allowing a more compact detector with less space between quadrupole triplets and a smaller β* for higher …
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Topology and geometry-based methods for quantifying the complexity of protein structures
… in the unfolded ensemble is a possible but rare event.
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