Digital Commons Network^™

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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 …

“In The University But Not Of The University”: Examining Institutionalized Counterspaces Through A Staff Perspective, Omar A. Ramirez

Master's Theses

Using a qualitative case study, this thesis examines a university counterspace that serves Students of Color through the perspective of the staff who work in that space. The case study aimed to explore four areas of investigation: the interviewees’ knowledge and perceptions of 1) the history of their counterspace; 2) the purpose of their counterspace; 3) the benefits of their counterspace; and 4) challenges of their counterspace. The counterspace was a program within a large, 4-year, public, R-1 research university. Five staff from the counterspace were interviewed. A thematic analysis of the data suggests that students were an essential part …

Deported Veterans: The Unintended Consequences Of “Good Moral Character”, Jonathan Deras

Master's Theses

The purpose of this research is to argue that U.S. immigration policy, specifically the 1996 IIRIRA (also known as IIRAIRA), needs to change regarding the legal treatment of immigrant U.S. military veteran deportees due to the following concepts. The first concept is to articulate how the criminalization of immigration, and how the military system intersects to facilitate the Deportation of U.S veterans. A key concept in this analysis is the standard of “good moral character” set by the U.S. government that enlistees need to meet to be accepted into the military; this standard is also used against immigrant veterans during …

Constructed Borders In Higher Education: A Critical Policy Analysis Of Undocumented College Students' Access To Study Abroad, Louise K. Hon

Master's Theses

Abstract Between 2012 and 2017, undocumented youth in the United States with Deferred Action for Childhood Arrival status were able to apply for Advance Parole permissions to travel abroad for educational purposes. During this time, DACA students attending colleges and universities across the nation engaged in study abroad through established education abroad programs. This qualitative study examines undocumented students’ decision to pursue educational abroad opportunities during their undergraduate education in the context of national, state and institutional policies and climate and compares and contrasts the experiences of the undocumented college students who successfully studied abroad with those who either attempted …

Female Mentorship: A Study On University Of San Francisco President’S Advisory Committee On The Status Of Women (Pacsw) Mentorship Program, Maria Bluth

Master's Theses

Mentorship is one way to advance gender equity, and it can enhance a women’s career, but finding a mentor can be intimidating, the University of San Francisco President’s Advisory Committee on the Status of Women (PACSW) Women’s Co-Mentoring Program seeks to increase confidence, community, and capacity amongst women-identified employees at the University of San Francisco. The program aims to accomplish this through the creation of intentional, time-bound one-on-one relationships between University employees based on confidentiality and collegiality (PACSW Mission Statement). The ideal goal of the Co-Mentorship program is to benefit the co-mentors, as well as positively impact the whole University …

Meta Analysis Of Rct Interventions, Ayo Ellis

Master's Theses

External validity of an RCT intervention enables understanding of where interventions are successful.

Meta-analysis allows for more generalized statements to be made on the effectiveness of RCTs across countries of different geographic and national income profiles. By comparing the findings from similar studies carried out in different settings I seek to describe whether RCTs in certain sectors are more sensitive to high GDP growth or higher levels of GDP. I consider 402 health, education, and industry development RCT studies done between 1980 and 2015 in 201 countries compiled by development non-profit Aidgrade. I find no significant effect of income level …

Professional Development And Care Planning, Maninder Deol

Master's Theses

The Covid-19 infection trend revealed to the Californian Prison healthcare system the importance of offering top-quality preventive and care services to control diseases. Irrespective of the understanding, there have been challenges in the transitional gap as older nurses are retiring and replaced by new ones. However, the lack of technical experience among the new nurses has exposed the patient population to human errors, which might be costly to amend. As a result, the initiative embarked on a project to train and empower nurses on preventive and care techniques.

Critical areas of concern include reporting, data collection, patient symptomology, results interpretation, …

Minority Student Food Insecurity In Higher Education, Joe Sevillano

Master's Theses

The minority student population in higher education has been affected by food insecurity at a disproportionate rate. Several studies have captured some of the issues associated with the material deficit but fail to identify more in-depth contributing factors. Using the theoretical framework of intersectionality, the researcher examines the experience, interpretation, and navigation of food insecurity in a medium-sized university located in a major city on the west coast. The researcher interviewed three students that self-identified as having multiple minority identities and experiencing some level of food insecurity while pursuing a degree. Findings from three rounds of interviews gave further context …

Our Stories, Our Voices: The Lived Experiences Of Black Families With Young Children During Covid-19, Devalin Jackson

Master's Theses

The purpose of this study was to explore the lived experiences of Black families raising young children during shelter in place orders and distance learning due to Covid-19. The study was conducted virtually through Zoom and Google form due to county shelter in place orders. Participants were recruited from the school in which the researcher worked. Through the use of virtual interviews, the five participants highlighted themes of reconnections, isolations, empowerment, family values and conversations. The families shared experiences of resilience and hope and brought thoughts of how these experiences could be highlighted in instructional and curriculum designs; especially during …

Noted Mirrors, Dennis Spears

Master's Theses

Noted Mirrors seeks exploration, it seeks discovery it seeks experience. I think, like most of us, I’ve often had far more wonders than answers, but I often like it that way. Noted Mirrors tries to understand a romance that frightened, a friend taken away too soon that crippled. An unconditional love from grandparents and a mother that rescued. A relationship with an absent father that poisoned. Revelational relationships with familiar strangers that taught so much in the form of freeing. A fascination with Redwoods and Orcas that brought so much life into merely being. And a curiosity of the abstract …

Volcanoes & Other Yards, Rebeca Flores

Master's Theses

Volcanoes & Other Yards is a collection of short stories set in the yards of California, Mexico, and El Salvador. Characters see the manifestations of their labor through imagination and purposeful acts of play. Working class characters are pushed to eruptions that make them question what it means to witness racism, capitalism, and noble acts of good. They undergo solitude, loss of home, and welfare lines, and they witness their country gas children, government intrusions, and grief. To reconcile with their generational trauma, they must encounter land and labor. The collection explores the idea of an imaginary volcano to bring …

#Younevertoldme: What Jewish American Children Learn About Palestinian Displacement During The Founding Of The State Of Israel, Nancy Sheftel-Gomes

Master's Theses

#YouNeverToldMe: What Jewish American Children Learn about Palestinian Displacement during the founding of the State of Israel examines how the education of Jewish American children in Jewish educational K-12 settings about the founding of the state of Israel omits details and events about the displacement of Palestinians and how knowledge gaps limit the possibility of dialogue among Jewish and Arab/Palestinian college students, and have a negative effect on Jewish identity. Within the methodological structure of Grounded Theory young adults, former students of the researcher, answer questions concerning their memories of what they learned about the founding of the state of …

Human Trafficking And The Media, Samantha N. Blum

Master's Theses

This paper focuses on how the media can affect the publics knowledge about human trafficking. Specific attention is paid to what human trafficking is and what the different types of criteria that need to be met are. Of the criteria that is met, the paper looks at the overlapping of requirements between human trafficking and other offenses. More importantly throughout the paper is analyzations on police officers’ beliefs about knowing what human trafficking is, what still needs to be done, and their stance on the current definition. The research presented demonstrates the need for more positive psychological approaches when talking …

Operational Decision-Making In Healthcare Using Control Charts, Rohan More

Master's Theses

The primary objective of this thesis was to design a framework supplemented with guidelines for the healthcare managers to select an appropriate type of control chart for operational decision-making. A systematic literature review was conducted to gauge the extent to which control charts were being used in a healthcare setting for clinical decision making and operational decision-making purposes. The findings showed that the application of control charts was almost equal for the clinical decision-making sector and the operational decision-making sector. On further analysis, the ability of control charts to function as a standalone tool was affirmed by the vast majority …

Strawberry Powdery Mildew Caused By Podosphaera Aphanis: Fungicide Resistance And Host Plant Resistance, Michael G. Palmer

Master's Theses

Strawberry powdery mildew, caused by Podosphaera aphanis, affects leaves, fruit, and runners of strawberry plants. Infected leaves have reduced photosynthetic capability and infected fruit become unmarketable. Both of these factors translate to economic loss for the grower and therefore merit taking measures to control the disease. One objective of this study was to evaluate the resistance developed in populations of strawberry powdery mildew to chemical control measures. A fungicide assay was developed to evaluate the efficacy of six treatments (penthiopyrad, quinoxyfen, myclobutanil, trifloxystrobin, cyflufenamid, fluopyram + trifloxystrobin) for control of the disease. Nineteen isolates of strawberry powdery mildew were …