Digital Commons Network^™

A Survey And Performance Analysis Of Orbit Propagators For Leo, Geo, And Highly Elliptical Orbits, Simon P. Shuster

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

On-orbit targeting, guidance, and navigation relies on state vector propagation algorithms that must strike a balance between accuracy and computational efficiency. To better understand this balance, the relative position accuracy and computational requirements of numerical and analytical propagation methods are analyzed for a variety of orbits. For numerical propagation, several differential equation formulations (Cowell, Encke-time, Encke-beta, and Equinoctial Elements) are compared over a range of integration step sizes for a given set of perturbations and numerical integration methods. This comparison is repeated for two numerical integrators: a Runge-Kutta 4th order and a NLZD4/4. For analytical propagation, SGP4, which relies on …

Extension Of Behavioral Momentum Theory To Conditions With Changing Reinforcer Rates, Andrew R. Craig

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Behavior is more likely to persist when disrupted in some way in the presence of stimuli correlated with frequent delivery of reward than in the presence of stimuli correlated with infrequent rewards. In laboratory investigations, the correlation between reward rates and specific stimuli are almost always held constant before testing for persistence. In the real world, however, how often rewards are encountered is likely to vary substantially over time. The major goal of the work described in this dissertation was to explore effects of reward rates that change over time on persistence of behavior in controlled laboratory settings using pigeon …

Object Recognition In Videos Utilizing Hierarchical And Temporal Objectness With Deep Neural Networks, Liang Peng

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

As the growth of mobile devices and social networks has been faster than ever, online image and video content has become truly ubiquitous today. Understanding of these images and videos, called vision, is one of the most primary ways for human being to perceive the world. Computer vision, which refers to the study of enabling machines to see and understand the visual world, is fundamental in advancing Artificial Intelligence.

Object recognition, which is defined as the task of locating and recognizing object categories in images and videos, is a major research field in computer vision. Recent research in object recognition …

Nonlinear Photothermal Radiometry And Its Applications To Pyrometry And Thermal Property Measurements, Austin Drew Fleming

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Accurate temperature and thermal property measurements are critical for the modeling and prediction of heat transfer. In many industries thermal management is a limiting factor of performance, and rely on advanced modeling techniques to develop and design methods to better manage thermal energy. This study expands the thermal property and pyrometry measurement capabilities by developing three new techniques based on thermal emission’s nonlinear dependence on temperature.

A Pattern Language For Designing Application-Level Communication Protocols And The Improvement Of Computer Science Education Through Cloud Computing, Jorge Edison Lascano

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Enterprises that develop software use current technology because of its proven advantages and to accelerate and improve the software development process. Nevertheless, it is difficult to be up-to-date for most professionals in the area. Although students from higher academic institutions need to learn these new tools, and their main purpose is to learn how learn; colleges still need to prepare students for modern enterprise requirements, so they teach new technologies to improve students’ skills. Ubiquitous computing is software and services available everywhere, for example in mobile devices, in different locations, in different networks. This computing requires good communication protocols so …

Developing A General Methodology For Evaluating Composite Action In Insulated Wall Panels, Jaiden Thomas Olsen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Precast Concrete Sandwich Panel Walls (PCSPW’s) have been in use for over 60 years. They provide a very efficient building envelope for many buildings. Characteristic PCSPW’s comprise an outer and inner layer (or wythe) of concrete separated by an insulating material. To use all of the material as efficiently as possible, the layers are attached by connectors which penetrate through the insulating layer and are embedded in either concrete wythe. These connectors make it possible for both layers of the wall to work together when resisting loads. The connectors are made out of plastic, or FRP, to prevent heat transfer …

A Stochastic Model For Water-Vegetation Systems And The Effect Of Decreasing Precipitation On Semi-Arid Environments, Shannon A. Dixon

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Current climate change trends are affecting the magnitude and recurrence of extreme weather events. In particular, several semi-arid regions around the planet are confronting more intense and prolonged lack of precipitation, slowly transforming these regions into deserts. Many mathematical models have been developed for purposes of analyzing vegetation-water interactions, particularly in semi-arid landscapes. Most models are based on the average behavior of the system as a whole, and how it is influenced by external changes. These models may be termed "macro-scale" models. Other models have concerned themselves with the interactions between individuals, in this case the interactions between individual plants …

Establishing A Kinetic Assessment Of Reactive Strength, Talin Louder

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Three neuromuscular characteristics are identified in Sheppard and Young’s model of agility: concentric strength and power, bilateral symmetry, and reactive strength. Measures of reactive strength attempt to model the neuromuscular regulation of tissue stress and strain. The Coefficient of Reactivity (CoR) is the first known assessment of neuromuscular reactivity. The CoR was developed as an assessment of neuromuscular performance in drop jumping. The construct validity of the CoR was placed in question when Warren Young proposed the Reactive Strength Index (RSI). The RSI improved the theoretical validity of reactive strength assessment since it included a component measure (ground contact time) …

Understanding How Emergent Bilinguals Bridge Belonging And Languages In Dual Language Immersion Settings, Marialuisa Di Stefano

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to understand how young children bridge belonging and language in a dual language immersion (DLI) setting. I developed a 10-week ethnographic study in a Spanish-English third-grade class in the Northeast of the U.S. where data was collected in the form of field notes, interviews, and artifacts. Here I explored the way language instruction and student participation influenced the development of the teacher and students’ multiple identities. The findings of this study suggest that emergent bilinguals’ identity development derives from the process built through multiple dialogic classroom instruction and practices. The products of this process …

Adaptive Background Modeling With Temporal Feature Update For Dynamic Foreground Object Removal, Li Yin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis explores several approaches in order to develop an effective algorithm for separating the moving objects from the background so that the background alone may be displayed in a video sequence. In particular, this thesis seeks to develop an algorithm that can successfully remove a moving teacher from the whiteboard, so that the writing on the whiteboard may be fully visible to the audience.

In this thesis, some prior works related to this problem are studied to understand the basic principles of adaptive background modeling, or removing the foreground from a background with occasional changes in a video sequence. …

Simple Soil Quality Tests And Organic Management Practices For Orchards In The Intermountain West, Esther Oline Thomsen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Soil health is often overlooked as a long-term management strategy as growers face an increasing number of short-term management challenges in the Intermountain West. The costs of inputs are rising and water resources are becoming more limited. Soil with poor health typically requires more amendments and fertlizers to meet crop needs. Soil health tests can help reveal management practices that reduce soil health, as well as those that improve soil health. Practices known to improve soil health are reduced to no tillage, cover crop use- especially legumes, and addition of mulch and other organic materials. Soil health testing is not …

Laboratory Experiences In Mathematical Biology For Post-Secondary Mathematics Students, Matthew Lewis

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In addition to the memorization, algorithmic skills and vocabulary which is the default focus in many mathematics classrooms, professional mathematicians are expected to creatively apply known techniques, construct new mathematical approaches and communicate with and about mathematics. We propose that students can learn these professional, higher level skills through Laboratory Experiences in Mathematical Biology (LEMBs) which put students in the role of mathematics researcher creating mathematics to describe and understand biological data. LEMBs are constructed so they require no specialized equipment and can easily be run in the context of a college math class. Students collect data and develop mathematical …

Statistical Techniques To Model And Optimize Performance Of Scientific, Numerically Intensive Workloads, Steena Dominica Steven Monteiro

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Projecting performance of applications and hardware is important to several market segments—hardware designers, software developers, supercomputing centers, and end users. Hardware designers estimate performance of current applications on future systems when designing new hardware. Software developers make performance estimates to evaluate performance of their code on different architectures and input datasets. Supercomputing centers try to optimize the process of matching computing resources to computing needs. End users requesting time on supercomputers must provide estimates of their application’s run time, and incorrect estimates can lead to wasted supercomputing resources and time. However, application performance is challenging to predict because it is …

Quality Of Experience Aware Spectrum Efficiency And Energy Efficiency Over Wireless Heterogeneous Networks, Yiran Xu

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Propelled by the explosive increases in mobile data traffic volume, existing wireless technologies are stretched to their capacity limits. There is a tremendous need for an expansion in system capacity and an improvement on energy efficiency. In addition, wireless network will support more and more multimedia services and applications, in which user experience has been always an important factor in evaluating the overall network performance. In order to keep pace with this explosion of data traffic and to meet the emerging quality of experience needs, wireless heterogeneous networks have been introduced as a promising network architecture evolution of the traditional …

Epistemic Beliefs Of Middle And High School Students In A Problem-Based, Scientific Inquiry Unit: An Exploratory, Mixed Methods Study, Jiangyue Gu

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Epistemic beliefs are individuals’ beliefs about the nature of knowledge, how knowledge is constructed, and how knowledge can be justified. This study employed a mixed-methods approach to examine: (a) middle and high school students’ self-reported epistemic beliefs (quantitative) and epistemic beliefs revealed from practice (qualitative) during a problem-based, scientific inquiry unit, (b) How do middle and high school students’ epistemic beliefs contribute to the construction of students’ problem solving processes, and (c) how and why do students’ epistemic beliefs change by engaging in PBL.

Twenty-one middle and high school students participated in a summer science class to investigate local water …

Thermal Property Measurement Of Thin Fibers By Complementary Methods, Troy Robert Munro

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Thin fibers are prevalent in many engineering materials. Measuring how well heat transfers in such small fibers can be difficult to determine, and previous methods have led to erroneous results. This dissertation details three proposed methods to improve the measurement of the thermal conductivity, thermal diffusivity, and volumetric heat capacity of thin fibers. Of particular interest is natural and synthetic spider silks because previously published values of the natural silk thermal conductivity was similar to copper, an excellent thermal conductor.

The three methods developed are the improved transient electrothermal technique (which was redeveloped to include radiation and convection heat losses …

Vision Based Extraction Of Nutrition Information From Skewed Nutrition Labels, Tanwir Zaman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Vision-based extraction of nutritional information from nutrition labels (NLs) available on most product packages is critical to proactive nutrition management, because it improves the user’s ability to engage in continuous nutritional data collection and analysis. However, even users who are health conscious find it difficult to keep track of their nutrition intake due to lack of time, motivation, or training. In order to make nutrition management more proactive we present a Proactive NUTrition Management System (PNUTS), which aims to make nutrition management more user friendly and proactive using computer vision techniques running on smartphones which are ubiquitous and powerful computers …

Rayleigh-Scatter Lidar Measurements Of The Mesosphere And Thermosphere And Their Connections To Sudden Stratospheric Warmings, Leda Sox

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Earth’s middle atmosphere is comprised of the stratosphere, mesosphere and thermosphere, from approximately 10 to 110 km, or approximately 6 to 68 miles. An understanding of the dynamics and climatological conditions in this region is of vital importance to the aerospace industry and military, which both launch aircraft and spacecraft into this region, as well as researchers who study climate change and the interactions between the atmosphere and the Earth, oceans, and space.

Measurements of atmospheric properties (density, temperature, and pressure) in this region are relatively difficult to gather as the middle atmosphere’s altitudes are both too high for …

Student Satisfaction At Utah State University Regional Campuses, Taylor K. Adams

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This research examined the difference between what undergraduate students at Utah State University (USU) regional campus locations perceive as important to their education and how satisfied students are with those education-related priorities. As institutions offer more distance education coursework, enrollment of nontraditional students is increasing. However, few studies examine satisfaction, which is a proven predictor of retention, of the student population described in this study.

The results of this study showed the highest discrepancies between priorities and satisfaction of undergraduate students at USU related to academic advising, course scheduling and registration; and finances including student fees, tuition, and financial aid …

Intraspecific Variation In The Response Of Elymus Elymoides To Competition From Bromus Tectorum, Rebecca K. Mann

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In the western United States, thousands of acres of degraded rangelands are dominated by aggressive invasive species such as cheatgrass (Bromus tectorum), and are seeded by managers with native plants in an attempt to restore species diversity, wildlife habitat, and ecosystem services. There are many options for obtaining seeds of native plants; for instance, they can be collected from the region where restoration is to occur, or they may be purchased through commercial producers. For a given plant species, managers may also select seeds from unique subspecies, cultivars, and populations. Genetic differentiation among these within-species groups can not only affect …

Towards Alternative Pathways: Nontraditional Student Success In A Distance-Delivered, Undergraduate Engineering Transfer Program, Angela L. Minichiello

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nontraditional students, including those who delay college entry, attend college part-time, work full-time, or financially support themselves or dependents, are highly underrepresented in engineering education. Recently, the United States began emphasizing a need to access this untapped human potential. U.S. educational policymakers now seek increased nontraditional student participation in engineering education through the creation of robust new pathways—within and between 2- and 4- year institutions—to undergraduate engineering degrees.

To be impactful, alternative pathways must be grounded in knowledge related to nontraditional student success in engineering. To access this knowledge, this study qualitatively examined the experiences of 14 nontraditional students who …

A Counting-Focused Instructional Treatment For Developing Number System Knowledge In Second-Grade: A Mixed Methods Study On Children's Number Sense, Jessica F. Shumway

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Instruction for developing students' number sense is a critical area of research in mathematics education because of the role number sense plays in early mathematics learning. Specifically, number system knowledge has been identified as a key cognitive mechanism in number sense development. The purpose of this mixed methods study was to explore variations in second-grade students' number sense development as they engaged in a counting-focused instructional treatment, geared towards developing number system knowledge, for differing amounts of time. Sixty second-grade students participated in number sense assessments and two students participated in in-depth, task-based interviews to provide quantitative and qualitative data …

Benchmark Experiments For Natural Convection In Nuclear Fuel Rod Bundles, Kyle L. Jones

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Buoyancy is the mechanism through which heated air causes fluid motion due to a difference in temperature between a body and the surrounding fluid. This fluid motion can be very erratic and unstable, which creates a difficult problem when attempting to simulate this fluid motion. Using high performance computational power the capability of simulating these complex interactions is available but requires assessment to determine the accuracy of these difficult flow scenarios. This study provides experimental data that can be used to assess the simulation’s accuracy and to ensure the computational models are achieving the correct solution. The Rotatable Buoyancy Tunnel …

Hidden History: A Mobile Application For Discovering Surrounding Landscapes, Sri Ram Ramineni

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis work describes the design, development and evaluation of a mobile application called Hidden History. This application lets users discover and explore three types of landscapes (Historic, Scenic and Cultural) using three different modes of discovery (Route, Explore and Tour).

Before designing Hidden History, the feature set of other applications that help users explore surrounding landscapes were identified and analyzed. Hidden History was then designed to implement the best features of these applications and offer several functionality improvements. Design began with iterative paper prototyping, following which a high fidelity, digital prototype was created. The high fidelity prototype was tested …

Fake Likers Detection On Facebook, Prudhvi Ratna Badri Satya

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

As billions of users have used online social networks such as Facebook, Twitter, and Instagram, many online services have begun adapting signals of the popularity. For example, search engines rank popular users posts in the top results. A post of a popular user is automatically delivered to the followers or likers. Popular companies in online social networks also get good reputation from people. The popularity on Facebook is measured based on the number of likes in a page. Unfortunately, some crowdsourcing websites (e.g.Microworkers.com) or supply-driven marketplaces (e.g.Fiverr.com) began offering fake liking services in which these crowd workers sent fake likes …

Live Load Testing And Analysis Of A 48-Year-Old Double Tee Girder Bridge, Victor J. Torres

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A 48-year-old prestressed double tee girder bridge located on Icy Springs road in Coalville, Utah, was tested for live load. The test measured strains, deflections and rotations. The instruments used for measuring the respective measurements were strain gages, deflectometers ("twangers") and tiltmeters.

From the recorded measurements a finite element model (FEM) was calibrated to validate the modeling techniques based on the test data. The FEM implemented two joint link elements to connect the flanges of the FEM deck to model the transverse load distribution of the bridge deteriorated shear connectors. The abutment restraints were modeled by one joint link elements. …

Translating Temporal Sql To Nested Sql, Venkata Rani

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Sequenced and nonsequenced semantics are the two previously researched semantics for the evaluation of an operation in a temporal database such as a query or data modification. Sequenced semantics evaluates an operation in each time instant using only the data alive at that time. Nonsequenced semantics, in contrast, means that an operation explicitly references and manipulates the timestamps in the data.

In this thesis we propose a new framework that shows both semantics are variants of a general temporal semantics. We present the general semantics and show how additional semantics, such as preceding semantics can be realized. The semantics are …

The Impact Of Social Comparisons On Stereotype Threat For Black College Students Attending Predominantly White Colleges And Universities, Odessia Knowles

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Despite increasing college enrollment rates for Black individuals, college completion rates remain dismal, thus the achievement gap between Black and White students remains in effect. One reason which may contribute to low completion rates for Black college students is stereotype threat. Stereotype threat is when an individual is at risk of confirming a negative stereotype about their group membership. For Blacks attending college, the threat would be related to academic underachievement. However, the impact of stereotype threat is highly individualized and an individual’s Black racial identity may impact stereotype threat for certain individuals.

Social comparison theory suggests that to gain …

An Allometric Approach To Evaluate Physiological And Production Efficiencies In Tree Size For Tart Cherry And Apple Orchard Systems, Zachary T. Brym

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In orchard systems, the size of a tree and the physical structure of its canopy influences how the tree gathers resources and uses them to produce fruit. Smaller orchard trees produce a higher proportion of fruit relative to their size. Small trees also produce higher quality fruit than larger trees. These relationships were demonstrated for apples and tart cherries grown in Utah. In physiological ecology, models called allometries have been developed that explain how the size of wild plants is related to growth, architecture, and reproduction. These models were applied to apple and tart cherry orchard systems and revealed consistent …

Path Following By A Quadrotor Using Virtual Target Pursuit Guidance, Abhishek Manjunath

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Missile guidance laws have been solely developed to follow and intercept a target thereby destroying or damaging it. In this research, the primary objective is to modify and adopt a missile guidance law to be used on a quadrotor to follow a virtual target. The target is termed 'virtual' as it only exists mathematically in the form of equations. The goal is to have the quadrotor successfully following the predefined path (described by the target) while maintaining a fixed distance from the virtual target. To ensure viability and assess performance, a detailed comparison with another path following law is made.