Digital Commons Network^™

Statistical Graph Quality Analysis Of Utah State University Master Of Science Thesis Reports, Ragan Astle

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Graphical software packages have become increasingly popular in our modern world, but there are concerns within the statistical visualization field about the default settings provided by these packages, which can make it challenging to create good quality graphs that align with standard graph principles. In this thesis, we investigate whether the quality of graphs from Utah State University (USU) Plan A Master of Science (MS) thesis reports from the years 1930 to 2019 was affected by the rise of graphical software packages. We collected all data stored on the USU Digital Commons website since November 2021 to determine the specific …

Stressor: An R Package For Benchmarking Machine Learning Models, Samuel A. Haycock

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Many discipline specific researchers need a way to quickly compare the accuracy of their predictive models to other alternatives. However, many of these researchers are not experienced with multiple programming languages. Python has recently been the leader in machine learning functionality, which includes the PyCaret library that allows users to develop high-performing machine learning models with only a few lines of code. The goal of the stressor package is to help users of the R programming language access the advantages of PyCaret without having to learn Python. This allows the user to leverage R’s powerful data analysis workflows, while simultaneously …

Teaching Contextually Appropriate Play Commenting Without The Use Of Visual Cues, Beverly Nichols

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Deficits in communication and play can affect the quality of life of autistic children and individuals, which is why it is important that we help them acquire these skills as early as possible. Applied behavior analysis (ABA) and script training and fading procedures are evidence-based practices that can successfully teach communication during play. However, script fading can be difficult, and scripts may not be able to be completely faded out of the environment. The findings from a recent study suggested that specific phrases can become associated with small pictures rather than written scripts Perhaps, these specific phrases can be tied …

Using Linked Digital Activity Schedules To Promote Cooperative Thematic Play, Vincent E. Campbell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Previous research has shown that children with autism spectrum disorder (ASD) may struggle to engage in social play, which may impact their willingness to engage in contextually appropriate cooperative play (Koegel et al., 2014). Researchers suggest that activity schedules targeting cooperative play may increase appropriate play for children with ASD (Brodhead et al.,2014; Pellegrino, 2018). However, previous studies did not include opportunities for interactive choice responding or the implementation of generic picture cues during script training. We investigated the impact of a linked digital activity schedule on promoting cooperative thematic play in children with ASD. Six children with ASD engaged …

Using Natural Language Processing To Quantify The Efficacy Of Language Simplification As A Communication Strategy, Brian Nalley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

People with communication disorders often experience difficulties being understood by unfamiliar listeners or in noisy environments. A common strategy for effectively communicating in these scenarios is to use simpler and more predictable language. Despite the prevalence of this strategy, there has been little to no research to date focused on the effectiveness of language simplification as a communication strategy. This study seeks to begin filling that gap by using natural language processing to determine whether speakers with early-stage Parkinson’s disease and age-matched neurotypical speakers are able to successfully simplify their language while still maintaining the original message.

Simplification was measured …

Signatures Of Black Holes, Alexandra B. Chanson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In this defense I will describes three approaches to learn more about the relationship between the dynamics of black-holes and the distinctive signatures of a black hole systems: infinitesimal changes in the black hole background producing field excitations relating new fundamental black hole thermodynamic relations, mechanisms powering relativistic black hole jets and spontaneous symmetry breaking in five space-time dimensions, and physical signatures of black hole event horizons as conformal field theory duals (in both d=4,5 dimensional axisymmetric spacetimes).

Exploring Body Image Related Cognitive Fusion As A Maintenance Mechanism Of Eating Disorder Pathology, Jennifer L. Barney

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Eating disorders are serious mental health conditions that can have serious negative effects on a person’s physical and mental well-being. These disorders are typically complex, and individuals are often struggling with one or more comorbid mental health problems, making them difficult to treat. To address this complexity and hopefully improve treatment outcomes for those with eating disorders, psychology research examining individual differences that appear to be related to differential treatment responses is needed. Better understanding how these factors relate to each other can help treatment providers identify the treatment methods most likely to work best for a specific individual based …

Making Space For Student Agency: A Multilayered Exploration Of Agency And Writing In A First‐Grade Classroom, Kara Decoursey

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Early literacy learning is crucial for later success in reading and writing. We have a limited understanding of generative writing (i.e., expressing ideas in writing) in first grade and further research is warranted. The socially situated nature of writing justifies a study of student agency during writing.

In this study, data were collected before, during, and after 10 writing sessions in a first-grade classroom. Students took a pre- and post-survey that revealed their self-perceptions of their agency and confidence as literacy learners. The participating teacher was interviewed three times and the teacher’s talk was recorded during all 45- to 60- …

Fremont Legacy In Capitol Reef And The Waterpocket Fold: A Radiocarbon Analysis Of The Pectol Collection Coiled Basketry Using Bayesian Modeling, Chelsea Cheney

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Perishable artifacts provide ample opportunity to better understand past human lives. Artifacts constructed from shorter-lived plant materials can make a significant contribution to archaeological research through radiocarbon dating. Analyzing and radiocarbon dating the basketry construction types from the Pectol Collection aids in the development of a more precise prehistoric timeline for the Capitol Reef and Waterpocket Fold (CRWF) area of southeastern Utah. Basketry technology construction is treated as a signal for growing Fremont occupancy throughout the Colorado Plateau and eastern Great Basin, and can the provide prior information used to better organize Bayesianbased age models. From AD 750–1050, a narrow …

Physiological Consequences Of Adrenal Enlargement And Implications For Toxin Resistance In North American Snakes, Megen E. Kepas

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The long observed relationship between enlarged adrenal glands and toad-eating in snakes has remained a mystery in physiological ecology and herpetology. It has been predicted that large adrenal glands may be capable of producing higher amounts of key hormones, and that higher plasma hormone levels may lend some behavioral or physiological benefits after a toxic toad has been eaten. I address questions surrounding adrenal enlargement and its potential benefits to toad eaters in four research chapters. In my second chapter, I quantify adrenal hormone output at different embryonic stages in the toad-generalist snake Thamnophis elegans and examine the ability of …

Exploring Versatile Glycosyltransferases From Microorganisms For Natural Product Biosynthesis, Jie Ren

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This dissertation is mainly focused on exploring versatile glycosyltransferases from different microorganisms with the purpose of biosynthesizing bioactive natural product glycosides through microbial fermentation. This engineered biosynthesis approach is environmentally friendly, safe, and efficient compared with plant extraction, chemical synthesis, and enzymatic synthesis. Additionally, we applied these characterized glycosyltransferases as efficient biocatalytic tools to produce novel glycosides to expand the chemical repertoire of nature. These novel compounds showed improved water solubility and some of them exhibited enhanced stability and biological activity, which laid the foundation for the development of new therapeutic agents.

In my dissertation research, I have discovered two …

The Derivation Of Sodium Density In The Mesosphere And Lower Thermosphere From The Na Lidar Photon Counting Profiles, Xiaoqi Xi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Derivation of Sodium (Na) number density from the Na lidar observations requires the in situ temperature and wind information because the absorption cross-section of the Na atom is a function of these dynamic parameters. The Na number density above ~ 110 km altitude was difficult to derive with the conventional algorithm, however. The standard output of the Na number density that utilizes the lidar-measured wind and temperature information falls short at ~ 110 km altitude and above due to the relatively large measurement uncertainties in the two critical parameters (low signal-to-noise ratio). Therefore, an innovative algorithm that may drive the …

A Cohesive Simulation And Testing Platform For Civil Autonomous Aerial Sensing And Operations, Stockton G. Slack

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Drones (also known as sUAS or small Uncrewed Aerial Systems) are often flown with cameras to take images of an area of land. These images can then be used to create a map by stitching these images together. This map can then be analyzed using scientific principles to learn things about the land and make decisions or take action based on the information.

The scientific application of drones is very advantageous, but flying a drone is inherently dangerous, impacting the safety of the airspace (particularly in the event of a crash), and drones are more dangerous the bigger they are. …

"There's No Good, It's Just Satisfactory": Perfectionistic Reactivity In Ncaa Student-Athletes, Daniel J. M. Fleming

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Perfectionistic reactivity is a style of responding to adversity that results in physical, psychological, and social components. Individuals who are high in perfectionistic tendencies are likely to experience anxiety, depression, frustration, and anger when perfection is not attained. The present dissertation utilized two complementary studies to examine perfectionistic reactivity in NCAA golf student-athletes. Results suggested that there is no relationship between perfectionism and performance at a hole-to-hole level. However, athletes highlighted that they experienced reactivity in their thoughts, feelings, and behaviors after both positive and negative performances. Student-athletes frequently cited self-compassion in their interviews, suggesting that the promotion of self-compassion …

Cislunar Navigation Techniques And Navigation Performance Optimization, Quinn P. Moon

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nova-C is a lunar lander developed by the private company Intuitive Machines to deliver commercial payloads to the Moon. The IM-1 mission set for 2023 will launch and land the Nova-C near the Moon's south pole. In this research, various navigation techniques are explored to determine the lander's position and velocity during key segments. This process is studied for key mission events including trajectory correction maneuvers (TCMs), lunar orbit insertion (LOI), and descent orbit insertion (DOI). Each mission segment, referred to as an Orbit Determination Segment (OD), is analyzed with three different navigation techniques: Monte Carlo Analysis, Linear Covariance Analysis, …

Using Head Start Children's Language Development To Predict Social Information Processing Ability, Kendra Newman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

As young children grow and develop, gaining social skills and different language abilities is extremely important. As children develop, they also acquire the ability to process social information, which then helps them respond in various social situations. Children should eventually be able to respond to social situations in socially acceptable ways, instead of answering in aggressive or passive ways. This study examined the relations between children’s language development, and social information processing ability. This study included 51 children, from 19 Head Start classrooms. Results showed that at the beginning of the Head Start year children with more language, responded in …

Black–White Disparities In Body Mass Index Trajectories From Adolescence To Adulthood: Assessing The Roles Of Adverse Childhood Experiences And Exposures To Short Sleep Durations, Olusola Akintoye Omisakin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In comparison to Whites and other racial groups, the Black population in the U.S. has experienced one of the highest prevalences of obesity. Research into the role of adverse childhood experiences (ACEs) has increased recently because the effects of ACEs often persist for a significant portion of a person’s lifetime. Furthermore, the reduction in sleep duration in recent decades has sparked worries about public health. This dissertation assesses Black-White disparities in the associations between (1) ACEs and BMI, and (2) short sleep durations and BMI from adolescence to adulthood. Public-use datasets from the National Longitudinal Study of Adolescent to Adult …

Super-Resolution Textured Digital Surface Map (Dsm) Formation By Selecting The Texture From Multiple Perspective Texel Images Taken By A Low-Cost Small Unmanned Aerial Vehicle (Uav), Bikalpa Khatiwada

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Textured Digital Surface Model (TDSM) is a three-dimensional terrain map with texture overlaid on it. Utah State University has developed a texel camera which can capture a 3D image called a texel image. A TDSM can be constructed by combining these multiple texel images, which is much cheaper than the traditional method. The overall goal is to create a TDSM for a larger area that is cheaper and equally accurate as the TDSM created using a high-cost system.

The images obtained from such an inexpensive camera have a lot of errors. To create scientifically accurate TDSM, the error presented in …

Opening The Black Box: Soil Microbial Communities In Field-Based Plant-Soil Feedback Experiments, Julia Kate Aaronson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Plant-soil feedback is a process through which plants modify the properties of their associated soils, affecting their growth. PSF can play a key role in regulating plant growth and communities including altering plant invasion, rarity, and abundance. However, our understanding of the soil organisms that drive these plant growth responses is limited. Most studies treat soils as a ‘black box’ and do little to reveal which specific microbes or microbial communities may be responsible. This chapter examines two recent large PSF field experiments conducted in Minnesota, USA, and Jena, Germany. These experiments revealed that plants altered their soils, changing subsequent …

The Impact Of Formative Assessment Cycles On Students' Attitudes And Achievement In A Large-Enrollment Undergraduate Introductory Statistics Course, Kimberleigh Felix Hadfield

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study aimed to investigate the impact of student attitudes toward statistics and student achievement after engaging in large-enrollment introductory statistics course curriculum using continuous formative assessments with feedback and reassessment opportunities. This framework, called Formative Assessment Cycles (FACs) was implanted, providing students formative assessments both in and out of the classroom, with feedback and reassessment. A quasi-experimental, quantitative research design allowed for the investigation of course achievement from pre-FACs to FACs semesters using regression discontinuity methodology. Changes in attitudes from pre- to post-survey in semesters using a curriculum with FACs were analyzed by multilevel regression techniques. Course achievement improved …

The Time-Dependent Ionospheric Model Using A Tec-Driven Servo: An Investigation Of The Capabilities And Limitations, Jenny Rebecca Whiteley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The ionosphere is a region of the atmosphere with a high density of electrons. These electrons affect the behavior of any electromagnetic wave that passes through the ionosphere. Communication and geolocation systems, such as traditional radio and Global Positioning Systems, depend on emitted electromagnetic signals being picked up by a receiver. The presence of the ionosphere affects the behavior of the signal and the quality of the service. Hence, the interactions between electromagnetic waves and the ionosphere provide a major motivation to understand, research, and successfully model and predict the ionosphere and its physical phenomena. This study focused on determining …

Physics-Guided Deep Learning For Solar Wind Modeling At L1 Point, Robert M. Johnson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Neural networks are adept at finding patterns that are too long and too small for humans to find in data. Usually, this power is used to generate predictions with greater accuracy than most alternative models. However, we can also use this power to understand more about the data we train these networks on. We do this by changing the data that the networks train on and the data they are tested on. This allows us to both control the maximum length of a pattern and to compare data between different groups, in our case, different solar cycles. This thesis is …

Development Of The Digital Signal Processing For The Space Weather Probes Version 2 Sensor Using The Matlab/Simulink Environment, Benjamin J. Lewis

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Space Weather Probes (SWP) is an instrument that provides measurements of the plasma environment of the ionosphere. SWP was flown on the Scintillation Prediction Observation Task (SPORT) mission, a joint mission between the United States of America and Brazil. This thesis will develop the digital signal processing (DSP) hardware design for the Space Weather Probes version 2 (SWP2). The data from these instruments will be used to determine the density and temperature of the local plasma, as well as the electric field in the local plasma. This thesis presents the design and testing of the DSP designs for all of …

The Longitudinal Effects Of Adverse Childhood Experiences On Internalizing And Externalizing Problems: In Search Of Demographic Disparities, Cynthia M. Navarro Flores

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Children experience high rates of emotional problems (e.g., anxiety, depression) and behavioral problems (e.g., defiance, aggression) that can have long-lasting detrimental effects. Emotional/behavioral problems have been found to relate to exposure to adversity during childhood (i.e., adverse childhood experiences [ACEs]). Studies have found that rates of exposure to ACEs and emotional/behavioral problems may vary depending on one’s race/ethnicity, sex, and income. Research has not yet looked at how emotional/behavioral problems develop throughout childhood in conjunction to exposure to ACEs. The current two-paper dissertation focused on examining the individual and conjointly developing trajectories of ACEs, and emotional (i.e., internalizing problems) and …

Public Perceptions And Attitudes Toward Domestic Climate Migrants And Migration In The U.S., Brittany Shae Harris

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Increasing frequency and intensity of extreme weather events due to global climate change have an important effect on human migration and relocation. Short-term extreme weather events like floods and wildfires are likely to continue to displace people. Long-term environmental changes like droughts and increasing temperatures may also contribute to increased human migration. This research aimed to better understand how people in the U.S. perceive domestic climate migrants, and what drives these perceptions. First, I investigated the relationship between public climate change risk perceptions and attitudes and perceptions about domestic climate migrants and migration. I found that people tend to rely …

Comparative Study Of Clustering Techniques On Eye-Tracking In Dynamic 3d Virtual Environments, Scott Johnson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Eye-tracking has been used for decades to understand how and why an individual focuses on particular objects, areas, and elements of space. A vast body of knowledge exists on how eye-tracking is measured. However, historically, eye-tracking has been predominately studied using 2D environments, with limited work in 3D environments. The purpose of this study is to identify which methods most accurately represent the areas that have captured the participant’s visual attention within a 3D dynamic environment. This will be completed by evaluating different clustering methods of fixations using a customized virtual reality tool that collects eye-tracking data. There exist several …

Comparing Commonly Used Aquatic Habitat Modeling Methods For Native Fishes, Eryn K. Turney

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Water resources are managed for a variety of human needs, including agriculture, industrial and municipal consumption, hydropower generation, and recreation. There has been a recent push to incorporate habitat needs of aquatic wildlife into water management models alongside these other uses, particularly as competition for limited water resources in a changing climate has reduced instream flow and contributed to declining native fish populations. Habitat models are used to estimate species distributions and differentiate between suitable and unsuitable habitat based on variables important to a given species, but are not usually incorporated into water management models. Because there are many ways …

App-Based Academic Interventions For Children With Autism, Cassity R. Haverkamp

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Technology, such as tablet/phone apps, robots, video games, and virtual reality, can be used to teach skills to autistic children. Research on technology supports for autistic youth often focus on social skills, a main part of an autism diagnosis. However, autistic children may also have academic challenges, and fewer studies have looked at how technology can teach academic skills to children with autism. We created three studies to look at how academic apps may benefit autistic children. In the first study, we reviewed studies that looked at how academic apps can increase the academic skills of children with autism. We …

Volatile Cycling And Metasomatism In Flat-Slab Subduction Zones Of The Central Andes, Coleman Hiett

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Flat-slab subduction, where an oceanic plate subducts horizontally below a continental margin for hundreds of kilometers, is an enigmatic but prevalent tectonic configuration in which chemical cycling and alteration of the continental plate is poorly constrained. Geochemical investigations in regions of modern and ancient flat-slab subduction in the Central Andes afford an opportunity to study this process. Certain elements naturally occur with varying number of neutrons in their nuclei (isotopes), and measurements of isotope ratios within geologic materials inform on chemical sources and geologic processes. This research leverages stable isotope analyses and other geochemical tools to investigate volatiles and other …

Reclaiming Fault Resilience And Energy Efficiency With Enhanced Performance In Low Power Architectures, Noel Daniel Gundi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Rapid developments of the AI domain has revolutionized the computing industry by the introduction of state-of-art AI architectures. This growth is also accompanied by a massive increase in the power consumption. Near-Theshold Computing (NTC) has emerged as a viable solution by offering significant savings in power consumption paving the way for an energy efficient design paradigm. However, these benefits are accompanied by a deterioration in performance due to the severe process variation and slower transistor switching at Near-Threshold operation. These problems severely restrict the usage of Near-Threshold operation in commercial applications. In this work, a novel AI architecture, Tensor Processing …