A Feasibility Study of Cellular Communication and Control of Unmanned Aerial Vehicles (open access)

A Feasibility Study of Cellular Communication and Control of Unmanned Aerial Vehicles

Consumer drones have used both standards such as Wi-Fi as well as proprietary communication protocols, such as DJI's OcuSync. While these methods are well suited to certain flying scenarios, they are limited in range to around 4.3 miles. Government and military unmanned aerial vehicles (UAVs) controlled through satellites allow for a global reach in a low-latency environment. To address the range issue of commercial UAVs, this thesis investigates using standardized cellular technologies for command and control of UAV systems. The thesis is divided into five chapters: Chapter 1 is the introduction to the thesis. Chapter 2 describes the equipment used as well as the test setup. This includes the drone used, the cellular module used, the microcontroller used, and a description of the software written to collect the data. Chapter 3 describes the data collection goals, as well as locations in the sky that were flown in order to gather experimental data. Finally, the results are presented in Chapter 4, which draws limited correlation between the collected data and flight readiness Chapter 5 wraps up the thesis with a conclusion and future areas for research are also presented.
Date: December 2019
Creator: Gardner, Michael Alan
System: The UNT Digital Library
Intergenerational Influences of Aggression: Social Cognitive Processes in Perspective-Taking and Aggressive Behavior in Young Adults' Romantic Relationships (open access)

Intergenerational Influences of Aggression: Social Cognitive Processes in Perspective-Taking and Aggressive Behavior in Young Adults' Romantic Relationships

The focus of the current study was to determine if SIP biases and perspective-taking serve as mediators between parental intimate partner violence (IPV), aggression, and interpersonal dominance in emerging adults' romantic relationships. We analyzed archival data comprised of self-report measures and TAT stories administered to 84 undergraduate students (women n = 62, M age = 21.73) between the ages 18 and 35. To test our hypotheses, we modified the social information processing model by incorporating perspective-taking, as measured through Interpersonal Decentering. Overall, we did not find significant association between witnessing parental IPV and Interpersonal Decentering maturity in college students. However, women's father-to-mother IPV was significantly negatively associated with Interpersonal Decentering maturity. For our mediation model, SIP aggressive responding biases were significantly associated with Interpersonal Decentering (average of story average scores) and with the presence of aggression in current romantic relationships; however, Interpersonal Decentering was not significantly predictive of aggression in current romantic relationships. Gender differences, study strengths and limitations, and future research directions are discussed.
Date: August 2019
Creator: Shamji, Jabeen
System: The UNT Digital Library
Finding a Data-Driven Definition of Binge-Watching (open access)

Finding a Data-Driven Definition of Binge-Watching

Binge-watching, the act of watching large amounts of television at a time, has become a popular phenomenon internationally; however, it has yet to be sufficiently defined. In order to define binge-watching, data was collected on specific watching instances from 216 undergraduate students at a large research university. Hierarchical and k-means cluster analyses were conducted in Phase I to empirically determine how binge-watching should be defined. In Phase II, that definition was tested by correlating the number of instances of binge-watching in a one-week period, collected by seven days of daily diary logs, with several theoretically related measures including body mass index, dissociative tendencies, psychological distress, compulsion to watch, boredom proneness, and escapism through watching. The data-driven definition was found to be that eight hours or more of continuous watching was binge-watching, while anything less than that was not. In Phase II, the frequency of binge-watching through the seven-day period was calculated based on that new definition. The frequency of binge-watching was positively correlated with body mass index and dissociative tendencies with statistical significance at the alpha = .05 level. Compulsion to watch was not statistically significant; however, there was a positive correlation. These findings indicate that the proposed data-driven definition …
Date: December 2019
Creator: Kelly, Megan Erin
System: The UNT Digital Library

Independence of Mania and Depression across 4 Years in Bipolar Disorder

Access: Use of this item is restricted to the UNT Community
If mania and depression are part of the same pathological processes, one would predict that episodes of one prospectively increase the odds of episodes of the other. The aim of the present study was to test this hypothesis. For comparison purposes, their relationship was contrasted to the relationship between mania and periods of psychosis. Exploratory analyses also tested the degree to which episodes of each occur with greater frequency over time (i.e., kindling). Participants for the present study came from the Suffolk County Mental Health Project (N = 628), a study of first-admission patients with psychosis. Of these participants, 144 met diagnostic criteria for bipolar I disorder and were analyzed for the current study. Results indicated that mania in a given month predicted depression the following month, even after controlling for other symptoms. The reverse, however, was not the case. Mania and psychosis, in contrast, were found to be robust predictors of one another from month to month. Effects were not due to treatment or demographic differences. These findings provide evidence that mania and depression are weakly related. In contrast, mania and psychosis are more closely linked. Findings are consistent with suggestions that psychiatric nosology regroup mania more closely with …
Date: May 2019
Creator: Bennett, Charles B.
System: The UNT Digital Library
Examining the Relationship between Bullying Experiences, Parental Partner Violence, and Partner Violence in Young Adulthood (open access)

Examining the Relationship between Bullying Experiences, Parental Partner Violence, and Partner Violence in Young Adulthood

The current study used secondary analysis of existing data to examine associations between bullying experiences, parental partner violence, and partner violence in young adulthood. We hypothesized that bullying in adolescence would be associated with witnessing parental IPV in adolescence and IPV in young adulthood. We believed that deficits in social information processing, particularly hostile attribution biases, would be associated with adolescent bullying. Lastly, we believed that decentering would act as a moderator, affecting the relationship between adolescent bullying and IPV in adulthood. We used correlational and moderation analyses to examine these hypotheses and found that relational bullying victimization was associated with witnessing parental IPV, and the frequency of bullying perpetration was associated with IPV perpetration in adulthood. We found that some aspects of bullying victimization were negatively associated with being unassertive, bullying perpetration was associated with hostile attribution biases, and the relationship between bullying and IPV was significant only at certain levels of decentering maturity.
Date: December 2019
Creator: Sanders, Courtney
System: The UNT Digital Library
Microfluidic-Based Fabrication of Photonic Microlasers for Biomedical Applications (open access)

Microfluidic-Based Fabrication of Photonic Microlasers for Biomedical Applications

Optical microlasers have been used in different engineering fields and for sensing various applications. They have been used in biomedical fields in applications such as for detecting protein biomarkers for cancer and for measuring biomechanical properties. The goal of this work is to propose a microfluidic-based fabrication method for fabricating optical polymer based microlasers, which has advantages, over current methods, such us the fabrication time, the contained cost, and the reproducibility of the microlaser's size. The microfluidic setup consisted of microfluidic pumps and a flow focusing droplet generator chip made of polydimethylsiloxane (PDMS). Parameters such as the flow rate (Q) and the pressure (P) of both continuous and dispersed phases are taken into account for determining the microlaser's size and a MATLAB imaging tool is used to reduce the microlaser's diameter estimation. In addition, two applications are discussed: i) electric field measurements via resonator doped with Di-Anepps-4 voltage sensitive dye, and ii) strain measurements in a 3D printed bone-like structure to mimic biomedical implantable sensors.
Date: December 2019
Creator: Cavazos, Omar
System: The UNT Digital Library
Creating the Character of North Texas: Demographics and Geography, 1841-1861 (open access)

Creating the Character of North Texas: Demographics and Geography, 1841-1861

Several historians have identified North Texas as constituting a unique cultural region in antebellum Texas, due to the more limited cotton and slave economies and greater opposition to secession. Different settlement patterns have been put forward as an explanation for the distinct "character" of North Texas, with North Texas being portrayed as being settled largely by migrants from the Upper South while the rest of the state was primarily settled by Lower Southerners. The argument rests on the assumption of differing economic and political cultures between Upper and Lower Southerners. This study investigates migration into North Texas counties and the economic life and secession vote in those counties. It challenges the simplistic dichotomy between migrants from the Upper and Lower South by demonstrating the similar rates at which these two groups grew cotton and owned slaves. It also illustrates how geographic considerations better explain the apparent distinctions between North Texas and the rest of the state. Transportation limitations are likely the reason for the more limited cultivation of cotton and, consequently, the lowered importance of slavery in North Texas. Concerns about Indian depredations following the removal of federal troops in the case of secession also seem to have promoted Unionist …
Date: December 2019
Creator: Stites, Russell
System: The UNT Digital Library
Lithic Production at the Mesilla Phase Placitas Arroyo Site Complex Doña Ana County, New Mexico (open access)

Lithic Production at the Mesilla Phase Placitas Arroyo Site Complex Doña Ana County, New Mexico

This study of lithic analysis shifts attention from typological studies to explicitly behavioral analyses, complimenting studies of both intrasite and intersite patterns of variability and change. Analysis of several assemblages from the Placitas Arroyo site complex reveals changing patterns of raw material procurement and selection, core reduction strategies, as well as tool production and discard. The most striking result thus far is the quite uniform emphasis on flake production from well-prepared cores, and the near absence of manufacture or maintenance of bifacial tools, especially projectile points. Associated with common ground stone artifacts, the flaked stone materials may well represent intensive food processing. Regardless, the technological patterns being revealed by this approach illustrate a productive new means to gain insights into changing behaviors in the Jornada Mogollon cultural tradition.
Date: August 2019
Creator: Younger, Alexandra Carla
System: The UNT Digital Library