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Articles 1 - 30 of 61
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Deep Reinforcement Learning Based Path-Planning For Multi-Agent Systems In Advection-Diffusion Field Reconstruction Tasks, Deepak Talwar
Deep Reinforcement Learning Based Path-Planning For Multi-Agent Systems In Advection-Diffusion Field Reconstruction Tasks, Deepak Talwar
Master's Theses
Many environmental processes can be represented mathematically using spatial-temporal varying partial-differential equations. Timely estimation and prediction of processes such as wildfires is critical for disaster management response, but is difficult to accomplish without the availability of a dense network of stationary sensors. In this work, we propose a deep reinforcement learning-based real-time path-planning algorithm for mobile sensor networks traveling in a formation through a spatial-temporal varying advection-diffusion field for the task of field reconstruction. A deep Q-network (DQN) agent is trained on simulated advection-diffusion fields to direct the mobile sensor network to travel along information-rich trajectories. The field measurements made …
Detecting Feeding And Estimating The Energetic Costs Of Diving In California Sea Lions (Zalophus Californianus) Using 3-Axis Accelerometers, Mason Russell Cole
Detecting Feeding And Estimating The Energetic Costs Of Diving In California Sea Lions (Zalophus Californianus) Using 3-Axis Accelerometers, Mason Russell Cole
Master's Theses
Knowledge of when animals feed and the energetic costs of foraging is key to understanding their foraging ecology and energetic trade-offs. Despite this importance, our ability to collect these data in marine mammals remains limited. In this thesis, I address knowledge gaps in both feeding detection and fine-scale diving energetic costs in a model species, the California sea lion (Zalophus californianus). I first developed and tested an analysis method to accurately detect prey capture using 3-axis accelerometers mounted on the head and back of two trained sea lions. An acceleration signal pattern isolated from a ‘training’ subset of synced video …
Lstm-Enabled Level Curve Tracking In Scalar Fields Using Multiple Mobile Robots, Kunj J. Parikh
Lstm-Enabled Level Curve Tracking In Scalar Fields Using Multiple Mobile Robots, Kunj J. Parikh
Master's Theses
Autonomous mobile sensor networks are ideal candidates for exploring large-scaleunknown fields with tasks ranging from source seeking, level curve tracking, mapping an unknown field, and many more. In this work, we investigate the problem of level curve tracking in unknown scalar fields using a limited number of mobile sensors. The level curve tracking problem has been studied in many applications such as monitoring the propagation of fire boundaries and the algae blooms. We design and implement a long short term memory (LSTM) enabled control strategy for a mobile sensor network to detect and track the desired level curve. We develop …
A Meta-Analysis Of Fmri Studies On Emotion Processing In Major Depressive Disorder, Madison Morocco
A Meta-Analysis Of Fmri Studies On Emotion Processing In Major Depressive Disorder, Madison Morocco
Master's Theses
The processing of an emotional stimulus involves a multi-step process that includes appraising and identifying a stimulus as well as producing an affective state in response. Many individuals with depressive disorders such as major depressive disorder (MDD) experience impairments related to emotion processing, likely caused by changes in the structure and function of brain regions important for emotion processing. However, the precise neural differences underlying emotion processing impairments in MDD remain unclear given conflicting findings in the neuroimaging literature. This lack of clarity has hindered the development of novel neurostimulation treatments for MDD, which require targeting of specific brain areas. …
The Impact Of Compensation On Engagement And Organizational Tenure: The Moderating Role Of Perceived Organizational Support, Alexis Johnson
The Impact Of Compensation On Engagement And Organizational Tenure: The Moderating Role Of Perceived Organizational Support, Alexis Johnson
Master's Theses
Compensation is a crucial tool utilized by companies to help attract, retain, and motivate employees. However, previous research has overlooked the ways in which compensation might add value to important employee outcomes such as engagement and organizational tenure. Therefore, this present study aimed to close this gap by examining the relationship between pay level and engagement, as well as pay level and organizational tenure. It was hypothesized that higher pay levels would increase the engagement dimensions of dedication, vigor, and absorption in an employee, and that higher pay levels would increase organizational tenure in an individual. It also sought to …
Influence Of Social Circles On User Recommendations, Chaitanya Krishna Kasaraneni
Influence Of Social Circles On User Recommendations, Chaitanya Krishna Kasaraneni
Master's Theses
Recommender systems are powerful tools that filter and recommend content relevant to a user. One of the most popular techniques used in recommender systems is collaborative filtering. Collaborative filtering has been successfully incorporated in many applications. However, these recommendation systems require a minimum number of users, items, and ratings in order to provide effective recommendations. This results in the infamous cold start problem where the system is not able to produce effective recommendations for new users. In recent times, with escalation in the popularity and usage of social networks, people tend to share their experiences in the form of reviews …
A Silicon Valley Life: A Silicon Valley Love Story, Sharon Simonson
A Silicon Valley Life: A Silicon Valley Love Story, Sharon Simonson
Master's Theses
In the last three decades, Silicon Valley has become one of the world’s most watched and imitated communities. Daily news reporters, long-form journalists, cinema and television-programming producers have crafted a public image, but it represents nothing of the lives of hundreds of thousands of Valley residents. These fabrications obscure and diminish our complex human profile and reduce our uniquely beautiful geography to a place to generate financial profits, with all the damaging disregard such attitudes foster. The essays of A Silicon Valley Life: A Silicon Valley Love Story seek to show our true self: our rich mix of people drawn …
Nuclear Thermal Rocket Engine With A Toroidal Aerospike Nozzle, Kyle Stewart
Nuclear Thermal Rocket Engine With A Toroidal Aerospike Nozzle, Kyle Stewart
Master's Theses
This thesis describes the coupling of a nuclear thermal rocket engine with a toroidal aerospike nozzle. The coupling of the two systems consists of two phases. The first of these phases begin with top-level systems and subsystems analysis and design of the new engine. The second phase is the analysis and characterization of the major engine systems through the use of computational fluid dynamics analysis. With the coupling of the nuclear thermal rocket engine with the aerospike nozzle, the new system will be known as the Nuclear Thermal Propulsion System. Due to the uniqueness of coupling a nuclear thermal rocket …
Prevalence Of Avoidant/Restrictive Food Intake Disorder And Association With Nutrition Status In Patients With Inflammatory Bowel Diseases, Emily Yelencich
Prevalence Of Avoidant/Restrictive Food Intake Disorder And Association With Nutrition Status In Patients With Inflammatory Bowel Diseases, Emily Yelencich
Master's Theses
There is a large body of research on the relationship between inflammatory bowel disease (IBD) and diet; however, few conclusive, generalizable recommendations have been determined. Regardless, IBD patients often alter their normal dietary intake, which is concerning considering the prevalence of malnutrition in the IBD population. Avoidant/restrictive food intake disorder (ARFID) is a feeding disorder that was recently added to the Diagnostic and Statistical Manual of Mental Disorders and its prevalence and impact on the nutritional status of IBD patients has not previously been described. In this study ARFID risk was measured using the Nine-Item ARFID Screen and in the …
Supervisor And Coworker Support: Their Moderating Roles On The Relationship Between Diversity Climate Perceptions And Retention-Related Outcomes, Sarah Crouse
Master's Theses
The purpose of the present study was to examine perceived supervisor support and perceived coworker support as moderators of the relationship between diversity climate perceptions and retention-related outcomes (affective commitment, organizational identification, and turnover intentions). Results from a self-report survey of 150 participants showed that neither perceived supervisor support nor perceived coworker support moderated the relationship between diversity climate perceptions and these outcomes. However, the results showed diversity climate perceptions were positively related to perceived supervisor support and perceived coworker support, and independently predicted these retention-related outcomes. Results also showed that perceived supervisor support was more strongly related to these …
An Efficient Design Methodology For Complex Sequential Asynchronous Digital Circuits, Tomasz Chadzynski
An Efficient Design Methodology For Complex Sequential Asynchronous Digital Circuits, Tomasz Chadzynski
Master's Theses
Asynchronous digital logic as a design alternative offers a smaller circuit area and lower power consumption but suffers from increased complexity and difficulties related to logic hazards and elements synchronization. The presented work proposes a design methodology based on the speed-independent sequential logic theory, oriented toward asynchronous hardware implementation of complex multi-step algorithms. Targeting controller-centric devices that perform data-driven non-linear execution, the methodology offers a CSP language-based controller workflow description approach and the specification of a project implementation template supported by a two-stage design process. First, the CSP layer describes complex speed-independent controller behavior offering better scalability and maintainability than …
Greenhouse Gas Emissions From Lithium-Ion Batteries Operating In California's Electrical Grid In 2019, Peter J. Hilkene
Greenhouse Gas Emissions From Lithium-Ion Batteries Operating In California's Electrical Grid In 2019, Peter J. Hilkene
Master's Theses
This work examines the impact on greenhouse gas emissions of energy storage devices operating on the California electrical grid during the year 2019. As solar power gains a greater share in California’s energy production, tools for storing the intermittent energy produced from solar and other variable generation sources become important in continuing their growth. In this study, the impact of the deployment of energy storage capacity in California was determined using three charging and discharging strategies. The first, meeting peak net-demand with solar, looked at battery charging when solar production was highest and discharging when net-demand is highest. The second …
Influence Of Night Work On Performance During Lunar Telerobotic Operations, Zachary Luke Glaros
Influence Of Night Work On Performance During Lunar Telerobotic Operations, Zachary Luke Glaros
Master's Theses
Real-time, reactive telerobotic mission control operations require personnel to actively operate remotely controlled vehicles or robots in real time. Due to the physical separation of the vehicle from the operator, such operations present additional factors that can influence fatigue (degraded mental performance) and workload (mental and physical cost of task requirements), making it difficult to assess how long an individual can conduct operations safely. The upcoming Volatiles Investigating Polar Exploration Rover will involve remotely controlling a lunar vehicle from an Earth-based mission control station. In order to determine how long personnel could successfully maintain alertness and performance while operating a …
Inclusive Leadership, Psychological Empowerment, And Affective Organizational Commitment: A Mediated Model, Mariah Lyn Van Buskirk
Inclusive Leadership, Psychological Empowerment, And Affective Organizational Commitment: A Mediated Model, Mariah Lyn Van Buskirk
Master's Theses
Inclusive leadership has become an important contextual factor to study in organizations given its impact on positive workplace outcomes. However, little is known about the ability of inclusive leadership to affect a wider range of outcomes and the various mediating mechanisms between inclusive leadership and outcomes. Therefore, the present study explored the mediating role of psychological empowerment on the relationship between inclusive leadership and affective organizational commitment. It was hypothesized that inclusive leadership would be positively related to affective organizational commitment both directly and indirectly through psychological empowerment. Results of an online survey from 189 employed individuals showed that inclusive …
Adaptive Learning Technique For Facial Recognition, Rachana Dineshkumar Bumb
Adaptive Learning Technique For Facial Recognition, Rachana Dineshkumar Bumb
Master's Theses
This research describes the adaptive learning technique for facial recognition. It is a common practice in convolutional neural network(CNN) based facial recognition to save its trained result on a large dataset and then load and apply it to ongoing facial recognition tasks. This generally used method lacks adaptation, and the ongoing evolution of new knowledge poses a key technical challenge. In this research, we propose a continued learning technique to incorporate new knowledge derived in each facial recognition process. A positive recognition with confidence score is assigned, and the image associated with this confidence is added to the image dataset …
Transfer Learning For Hyperspectral Images Utilizing Channel Selection Techniques And Ensemble Methods, Scott Daniel Vogel
Transfer Learning For Hyperspectral Images Utilizing Channel Selection Techniques And Ensemble Methods, Scott Daniel Vogel
Master's Theses
Hyperspectral images contain information from a wider range of the electromagnetic spectrum than natural images which gives them potential for better classification ability. However, hyperspectral datasets are typically small due to the expensive equipment needed to obtain the images, which can limit classification performance. One solution to this problem is transfer learning, in which a model trained on one dataset is reused for a separate dataset. Research has shown that transfer learning between hyperspectral datasets can give improved performance over models without transfer learning when training data are limited. Since extra hyperspectral data are not always available, the solution proposed …
Lc-Ms/Ms Method Development For The Quantitation Of Methylmalonic Acid Using Aqueous Normal Phase Chromatography, Daniel Joseph Biocini
Lc-Ms/Ms Method Development For The Quantitation Of Methylmalonic Acid Using Aqueous Normal Phase Chromatography, Daniel Joseph Biocini
Master's Theses
The aim of the study was to develop a quantitative assay for methylmalonic acid (MMA), an important biomarker for clinical diagnosis of vitamin B12 (B12) deficiency. The techniques of liquid chromatography and tandem mass spectrometry (LC-MS/MS) are used for separation and quantitation of MMA, as well as its endogenous isomer succinic acid. The MS/MS method was developed using an infusion set-up and manual tuning experiments. Relevant transitions were detected for the two analytes and MMA-d3, then a preliminary MS/MS method was developed. The preliminary LC method was further optimized. Various gradients, mobile phases (MPs), and additive combinations were used across …
The Relationship Between Company, Manager, Group, And Individual-Level Variables And Affective Commitment, Varavit Chinnapong
The Relationship Between Company, Manager, Group, And Individual-Level Variables And Affective Commitment, Varavit Chinnapong
Master's Theses
Predicting employees' affective commitment to their organization continues to be of strong interest to researchers. Previous studies have examined the relationship between specific organizational levels (company, manager, group, individual) and affective commitment. However, there is a lack of research that has analyzed all four levels in one study. Therefore, the current study sought to evaluate the relationships between the four organizational levels and affective commitment. More specifically, the current study analyzed human resources practices as the company-level variables, transformational and transactional leadership as the manager-level variables, group cohesion as the group-level variable, and psychological safety at the individual level. The …
The Moderating Effect Of Leadership Adaptability On The Relationship Between Employee Adaptability And Job Performance, Justine Davis
The Moderating Effect Of Leadership Adaptability On The Relationship Between Employee Adaptability And Job Performance, Justine Davis
Master's Theses
The purpose of this study was to investigate the potential moderating effect of leadership adaptability on the relationship between employee adaptability and employee job performance. Previous research explored leadership adaptability as a mediator; however, there was a significant gap exploring leadership adaptability as a moderator. Participants were recruited via online social and personal networks. 125 participants completed a self-report survey consisting of items measuring employee adaptability, perceived manager adaptability and job performance. Results did not show perceived manager adaptability as a moderator of the relationship between employee adaptability and job performance. The results indicated that there were significant relationships between …
Effects Of Urbanization And Habitat On The Diet And Reproduction Of Red-Shouldered Hawks In Central California, Catherine Y. Fisher
Effects Of Urbanization And Habitat On The Diet And Reproduction Of Red-Shouldered Hawks In Central California, Catherine Y. Fisher
Master's Theses
Urbanization alters biological community interactions and trophic structures compared to natural habitats; these changes may be reflected in the diets of apex predators such as raptors. The red-shouldered hawk (Buteo lineatus) is a dietary generalist that is expanding from natural and rural habitats into urbanized areas. In this study, direct observation was used to quantify the diet and reproductive success of red-shouldered hawks in Santa Clara County, California during the 2019 breeding season. GIS methods were used to quantify the nesting habitat and level of urbanization at each nest. Hawk diet consisted of mammals (50.4% by frequency and 77.7% by …
The Relationship Between Diversity Climate Perceptions And Organizational Citizenship Behavior And Work Engagement: The Mediating Role Of Overall Organizational Justice, Arika Nakajima Higgins
The Relationship Between Diversity Climate Perceptions And Organizational Citizenship Behavior And Work Engagement: The Mediating Role Of Overall Organizational Justice, Arika Nakajima Higgins
Master's Theses
Employees’ perceptions concerning their organization’s diversity climate have important implications for both the organization and the individual. Diversity climate research has traditionally focused on exploring the moderators of the relationship between diversity climate perceptions and the attitudinal outcomes of employees; however, research has neglected to examine behavioral outcomes and the potential mediators of the relationship. Therefore, the present study explored the indirect effects of overall organizational justice on the relationship between diversity climate perceptions and organizational citizenship behavior and work engagement. It was hypothesized that diversity climate perceptions would be positively related to organizational citizenship behavior and work engagement. It …
Parental Influences On Adolescents' Risky Media Usage, Dahyeon Jung
Parental Influences On Adolescents' Risky Media Usage, Dahyeon Jung
Master's Theses
The present study investigated how parenting styles influence adolescents’ risky media usage and how these associations vary according to media-specific parenting practices and adolescent characteristics. Participants included 315 adolescents aged 13-18 in the United States, who completed questionnaires on parenting styles (i.e., authoritative, authoritarian, permissive), media-specific parenting practices (i.e., active conversational practices, coercive monitoring, preventive practices), and their depression, self-esteem, and risky media usage. Findings indicated all three parenting styles were associated with adolescent exposure to risk through media, but only authoritarian and permissive were related to internet addiction. Across parenting styles, adolescents with parents who engaged in high compared …
Easy In Any Language: Syntax, Semantics, And Pragmatics Of Activity-Oriented Adjectives In Six Languages, David Koffman
Easy In Any Language: Syntax, Semantics, And Pragmatics Of Activity-Oriented Adjectives In Six Languages, David Koffman
Master's Theses
Words that denote the degree of effort required for some activity, called easy adjectives here, have distinctive behavior. This behavior is explored in six languages to determine how the semantics of these words is reflected in the expressions to which they can apply, the constructions in which they appear, and their use in discourse. For four Indo-European languages, English, Spanish, German, and Russian, the analysis is based on random samples from linguistic corpora. For two non-Indo-European languages, Japanese and Swahili, the analysis is based on consultant elicitations and published examples. The analysis confirms that easy adjectives have distinctive behavior compared …
Inducing The Overview Effect Using Virtual Reality, Nhat Quang Le
Inducing The Overview Effect Using Virtual Reality, Nhat Quang Le
Master's Theses
Astronauts who return from space missions have reported and demonstrated a significant increase in their feelings of connection to humanity and the planet. This shift towards a more humanistic, global perspective in astronauts was termed the “overview effect” by White (2014). There is a lack of research on the overview effect despite the significant, positive changes in those who have experienced it. This study aims to provide empirical evidence of and a possible induction method for the overview effect. We hypothesized that it might be possible to induce the overview effect using virtual reality (VR). In the current study, 81 …
The Moderating Role Of Agreeableness And Conscientiousness On The Relationships Between Burnout And Withdrawal Behaviors, Nikoo Samee
Master's Theses
It has been shown that employees who experience burnout are more likely to engage in withdrawal behaviors, which are behaviors that harm the morale of employees and the bottom line of an organization. There has been some research on the moderating effect of situational variables (e.g., leadership style) on the relationship between burnout and withdrawal behaviors, but there is a lack of research on how personal characteristics may play a role in such relationships. The purpose of this study was to examine the moderating role of agreeableness and conscientiousness on the relationship between burnout and three withdrawal behaviors: lateness, absenteeism, …
The Relationship Between Authentic Leadership And Organizational Change Readiness: The Mediating Role Of Psychological Safety, Paulina Christine Manzano
The Relationship Between Authentic Leadership And Organizational Change Readiness: The Mediating Role Of Psychological Safety, Paulina Christine Manzano
Master's Theses
The purpose of the current study was to examine the mediating effect of psychological safety on the relationship between authentic leadership and organizational change readiness in the workplace. A total of 107 employees participated in the study, which utilized online survey distribution. Results showed that psychological safety partially mediated the relationship between authentic leadership and organizational change readiness. In other words, the more employees perceived their leadership to be authentic, the more likely employees felt safe taking risks at work, which in turn, increased employees’ emotional and cognitive inclination to adopt and embrace organizational change. Based on these findings, organizations …
Lithology, Structure, Geochronology, And Tectonic Implications Of The Spider Glacier Unit And Holden Assemblage, North Cascades, Washington, Colin Phillips
Lithology, Structure, Geochronology, And Tectonic Implications Of The Spider Glacier Unit And Holden Assemblage, North Cascades, Washington, Colin Phillips
Master's Theses
To better understand the effects of deeply emplaced sediments on continental magmatic arcs, researchers study crustal cross sections where meta-sediments are exposed at the surface, such as the crystalline core of the North Cascades of Washington. The 8–12 kbar Swakane Biotite Gneiss has been considered the deepest meta-sedimentary unit in the section, but my mapping shows that the adjacent Spider Glacier unit is probably structurally lower. The Spider Glacier unit consists of biotite and hornblende gneisses, quartzites and rare meta-peridotites, all deformed by highly variably oriented folds with a mean moderate west plunge. My U-Pb dating of detrital zircon indicates …
All Things Come To Pass, Brandon Luu
All Things Come To Pass, Brandon Luu
Master's Theses
All Things Come to Pass is a poetry collection consisting of 36 poems that revolve around the themes of impermanence, death, and memory. It is divided into three sections: Crisis, Melancholy, and Acceptance, inspired by the five stages of grief by Elisabeth Kübler-Ross. The poems are written primarily in free-verse and include genres such as elegy, pastoral, and narrative. The collection contemplates whether given the finite nature of life, in an existence where nothing lasts forever and everything seems ultimately inconsequential, what is it that should be considered important?
Synthesis And Characterization Of A Novel Verdazyl Spin Probe, Allisa Clemens
Synthesis And Characterization Of A Novel Verdazyl Spin Probe, Allisa Clemens
Master's Theses
The use of probe molecules has been integral to the understanding of protein structure and dynamics. Spin labels are commonly used as probes on molecules, such as phospholipids, peptides, proteins, or drugs in vivo. The probes enable the precise and quantitative measuring of the movements of these molecules which has led to the elucidation of function. Nitroxides are the most widely studied and employed spin probes, despite being reduced to hydroxylamines by ascorbic acid in vivo in a matter of minutes. Verdazyls provide comparable applications to nitroxide radicals, with the added benefits of having tunable conformation and hydrophobicity by altering …
Assessing The Relationship Between Narcissism, Neuroticism, And Leadership Skills, Krista Marie Brooker
Assessing The Relationship Between Narcissism, Neuroticism, And Leadership Skills, Krista Marie Brooker
Master's Theses
Understanding personality traits that are related to leadership skills is important in order to hire effective leaders. Research has seldom examined the relationship between narcissism, neuroticism, and leadership skills. Therefore, the present study was conducted to examine the relationship between narcissism, neuroticism, and leadership skills (human skills and conceptual skills). It was hypothesized that narcissism would be positively related to human skills and conceptual skills. It was also hypothesized that neuroticism would be negatively related to human skills and conceptual skills. A total of 145 employees participated in the self-report survey. Results showed that there was no relationship between narcissism …