Digital Commons Network^™

Will Oakland Burn Again: Understanding The Fire Hazard In An Urban Park System, Alessandra M. Zambrano

Master's Theses

Though almost thirty years have passed since the 1991 Tunnel Fire, the wildfire hazard is still present in the Oakland Hills. This study was conducted to determine if the vegetation in the Oakland Hills had reverted back to fuel conditions that contributed to the Tunnel Fire, examine how the fire hazard has changed since 1991, and evaluate planned wildfire mitigation. The goal was to determine how fuel conditions have changed since 1991 and compare potential fire behavior to that of the Tunnel Fire. Additionally, the study examined the effectiveness of the mitigation actions described in the East Bay Regional Park …

Applying Facial Emotion Recognition To Usability Evaluations To Reduce Analysis Time, Gavin Kam Chao

Master's Theses

Usability testing is an important part of product design that offers developers insight into a product’s ability to help users achieve their goals. Despite the usefulness of usability testing, human usability evaluations are costly and time-intensive processes. Developing methods to reduce the time and costs of usability evaluations is important for organizations to improve the usability of their products without expensive investments. One prospective solution to this is the application of facial emotion recognition to automate the collection of qualitative metrics normally identified by human usability evaluators.

In this paper, facial emotion recognition (FER) was applied to mock usability recordings …

Comparison Of Hilbert Transform And Derivative Methods For Converting Ecg Data Into Cardioid Plots To Detect Heart Abnormalities, Robert George Goldie

Master's Theses

Electrocardiogram (ECG) time-domain signals contain important information about the heart. Several techniques have been proposed for creating a two-dimensional visualization of an ECG, called a Cardioid, that can be used to detect heart abnormalities with computer algorithms. The derivative method is the prevailing technique, which is popular for its low complexity, but it can introduce distortion into the Cardioid plot without additional signal processing. The Hilbert transform is an alternative method which has unity gain and phase shifts the ECG signal by 90 degrees to create the Cardioid plot. However, the Hilbert transform is seldom used and has historically been …

Using Pitch Tipping For Baseball Pitch Prediction, Brian Ishii

Master's Theses

Data Analytics and technology have changed baseball as we know it. From the increase in defensive shifts to teams using cameras in the outfield to steal signs, teams will try anything to win. One way to gain an edge in baseball is to figure out what pitches a pitcher will pitch. Pitch prediction is a popular task to try to accomplish with all the data that baseball provides. Most methods involve using situational data like the ball and strike count. In this paper, we try a different method of predicting pitch type by only looking at the pitcher's pose in …

Understanding The Impact Of The Covid-19 Pandemic Within Educational Communities Using Longitudinal Analysis, Alexa Steidl

Master's Theses

At California State University, Los Angeles and California Polytechnic University, San Luis

Obispo, a longitudinal survey was created in response to the COVID-19 pandemic for students within their respective engineering departments. A combination of nonparametric and longitudinal analysis is performed to evaluate the impacts of the transition to a virtual educational environment and the stressors brought on by the global pandemic. Additional qualitative evaluation is performed to gain insight and make program recommendations to enhance the resilience of individuals in the academic systems. Results demonstrate a large shift in circumstances immediately at the start of the pandemic, with a variety …

The Car (Confront, Address, Replace) Strategy: An Antiracist Engineering Pedagogy, Amman Fasil Asfaw

Master's Theses

The CAR (confront, address, replace) Strategy is an antiracist pedagogy aiming to drive out exclusionary terminology in engineering education.

“Master-slave” terminology is still commonplace in engineering education and industry. However, questions have been raised about the negative impacts of such language. Usage of exclusionary terminology such as “master-slave” in academia can make students—especially those who identify as women and/or Black/African-American—feel uncomfortable, potentially evoking Stereotype Threat (Danowitz, 2020) and/or Curriculum Trauma (Buul, 2020). Indeed, prior research shows that students from a number of backgrounds find non-inclusive terminologies such as “master-slave” to be a major problem (Danowitz, 2020). Currently, women-identifying and gender …

Design And Modeling Of A Distributed Network For The Dc House Project, Lauren N. Rotsios

Master's Theses

This thesis covers the design and simulation of a model for a distributed network of DC Houses in MATLAB Simulink. The model will allow for sharing of power between houses within the network. The developed model consists of five separate DC House branches with local power generation. Each branch consists of a PV MPPT charge controller subsystem, a resistive load, and a bidirectional buck-boost converter subsystem. The high voltage side of every bidirectional buck-boost converter is connected together through the transmission line at a single high voltage DC bus. The performance of the individual components of the model is verified …

Transfer Learning Approach To Powder Bed Fusion Additive Manufacturing Defect Detection, Michael Wu

Master's Theses

Laser powder bed fusion (LPBF) remains a predominately open-loop additive manufacturing process with minimal in-situ quality and process control. Some machines feature optical monitoring systems but lack automated analytical capabilities for real-time defect detection. Recent advances in machine learning (ML) and convolutional neural networks (CNN) present compelling solutions to analyze images in real-time and to develop in-situ monitoring.

Approximately 30,000 selective laser melting (SLM) build images from 31 previous builds are gathered and labeled as either “okay” or “defect”. Then, 14 open-sourced CNN were trained using transfer learning to classify the SLM build images. These models were evaluated by F1 …

Modeling The Groundwater Basin In The Northern Cities Management Area, Allyson Swain

Master's Theses

A model was developed to simulate the groundwater of 8,300 acres of the Northern Cities Management Area (NCMA), which encompasses the northern portion of the Arroyo Grande Watershed and a small subset of the Santa Maria Valley Groundwater Basin. This watershed and groundwater basin is located on the coast and contains Oceano and the Cities of Arroyo Grande, Grover Beach, Pismo Beach. Groundwater in the NCMA is used heavily for agricultural irrigation in the southern portion and municipal applications in the northern portion. Up to 18 of these municipal wells and over 50 irrigation wells are drawing groundwater at any …

Scalable Cognitive Radio Network Testbed In Real Time, Kevin Z. Yu

Master's Theses

Modern society places an increasingly high demand on data transmission. Much of that data transmission takes place through communication over the frequency spectrum. The channels on the spectrum are limited resources. Researchers realize that at certain times of day some channels are overloaded, while others are not being fully utilized. A spectrum management system may be beneficial to remedy this efficiency issue. One of the proposed systems, Cognitive Radio Network (CRN), has progressed over the years thanks to studies on a wide range of subjects, including geolocation, data throughput rate, and channel handoff selection algorithm, which provide fundamental support for …

Soarnet, Deep Learning Thermal Detection For Free Flight, Jake T. Tallman

Master's Theses

Thermals are regions of rising hot air formed on the ground through the warming of the surface by the sun. Thermals are commonly used by birds and glider pilots to extend flight duration, increase cross-country distance, and conserve energy. This kind of powerless flight using natural sources of lift is called soaring. Once a thermal is encountered, the pilot flies in circles to keep within the thermal, so gaining altitude before flying off to the next thermal and towards the destination. A single thermal can net a pilot thousands of feet of elevation gain, however estimating thermal locations is not …

Expanding Housing Typology, Increasing Affordability: A Flexible Density Program For The City Of San Luis Obispo, Graham J. Bultema

Master's Theses

The City of San Luis Obispo faces an ongoing housing production shortage and housing affordability crisis that has been afflicting jurisdictions across State of California for a prolonged period of time. The City faces many of the same housing availability and affordability challenges as the rest of the State, but also has distinct characteristics that necessitate unique policies and strategies, such as the concurrent presence of both a large student and young professional population as well as a wealthy retirement community, which drastically drives up housing prices and demand.

The Flexible Density Program is proposed by the City of San …

Modeling The Spread Of Covid-19 Over Varied Contact Networks, Ryan L. Solorzano

Master's Theses

When attempting to mitigate the spread of an epidemic without the use of a vaccine, many measures may be made to dampen the spread of the disease such as physically distancing and wearing masks. The implementation of an effective test and quarantine strategy on a population has the potential to make a large impact on the spread of the disease as well. Testing and quarantining strategies become difficult when a portion of the population are asymptomatic spreaders of the disease. Additionally, a study has shown that randomly testing a portion of a population for asymptomatic individuals makes a small impact …

Examining The Ecological And Social Implications Of Parklets And Plazas Across Multiple Urban Scales, Joshua L. Muller

Master's Theses

Faced with population increases but stagnant capital improvements and impacts from global warming, cities around the world are experimenting with smaller-scale and cheaper strategies in order to accommodate the new influx of residents. New York City has led the way in converting low-efficiency intersection space into public plazas with a limited range of permanently installed elements and San Francisco has pioneered the concept of the parklet, which converts two to four street parking spaces into a modular and flexible pedestrian space. I seek to answer two questions about these spaces: What are common factors influencing the viability and successful implementation …

Data Driven Transfer Students Support Analysis, Kathryn Steidl

Master's Theses

Low income, academically talented, underrepresented students within the Central Coast of California face barriers in transferring and completing their technical degree. In order to meet future work needs and improve the quality of public life, the path for transfer students needs to be more accessible. To improve access to a high-quality engineering education for local students, the ENGAGE grant (Engineering Neighbors: Gaining Access, Growing Engineers -NSF Grant numbers 1834128 and 1834154) was created. This initiative strives to support local transfer students pre-transfer, during transfer, and post transfer by providing additional academic and financial resources. Five years of Cal Poly transfer …

An Artificial Neural Network For Bankruptcy Prediction, Walter D. Magdefrau

Master's Theses

Assessing the financial health of organizations remains a topic of great interest to economists, financial institutions, and invested stakeholders. For more than a century, research into financial distress has focused primarily on traditional applications of statistical analysis; however, modern advances in computational efficiency have created a significant opportunity for more sophisticated approaches. This thesis investigates the application of artificial intelligence on company bankruptcy prediction. The proposed neural network model is evaluated using the Polish Companies Bankruptcy dataset and yields a 5-year prediction accuracy of 96.5% and an AUC (area under receiver operating characteristic curve) measure of 92.4%.

A Power System-Based Iot Network For Remote Sensing Applications, Dominic Gaiero

Master's Theses

Cities around the world are facing increasingly significant challenges, including rapid urbanization, resource management, and environmental threats. In California for example, wildfires present an ever-growing threat that gravely harms people, destroys communities, and causes billions of dollars in damages. The task of addressing these environmental threats and many other challenges is greatly aided with widespread data collection and real-time inference. However, as IoT networks scale and require more energy for near-data analytics, the IoT endpoints require more power and complexity, limiting their deployment. Additionally, deploying endpoints in remote locations creates further challenges with higher reliability and communication constraints. In this …

A Performance Survey Of Text-Based Sentiment Analysis Methods For Automating Usability Evaluations, Kelsi Van Damme

Master's Theses

Usability testing, or user experience (UX) testing, is increasingly recognized as an important part of the user interface design process. However, evaluating usability tests can be expensive in terms of time and resources and can lack consistency between human evaluators. This makes automation an appealing expansion or alternative to conventional usability techniques.

Early usability automation focused on evaluating human behavior through quantitative metrics but the explosion of opinion mining and sentiment analysis applications in recent decades has led to exciting new possibilities for usability evaluation methods.

This paper presents a survey of modern, open-source sentiment analyzers’ usefulness in extracting and …

Perishable Food Waste Reduction Through Technological Implementation At The Retail Level Of The Food Supply Chain, Cassandra Harriman

Master's Theses

Food waste has become a disaster of global proportion that the world can no longer turn a blind eye to. This paper aims to reduce food waste at the retail level of the food supply chain by recommending and quantifying the effects of current technology that can be implemented in traditional supermarkets. This research recommends that retailers implement electronic shelf labels in stores and employ dynamic pricing of perishable products, leading to reduction of food waste. No prior research had considered the primary goal of reducing food waste while preserving retailer profit through technological implementation. This paper quantifies the effects …

Dependencyvis: Helping Developers Visualize Software Dependency Information, Nathan Lui

Master's Theses

The use of dependencies have been increasing in popularity over the past decade, especially as package managers such as JavaScript's npm has made getting these packages a simple command to run. However, while incidents such as the left-pad incident has increased awareness of how vulnerable relying on these packages are, there is still some work to be done when it comes to getting developers to take the extra research step to determine if a package is up to standards. Finding metrics of different packages and comparing them is always a difficult and time consuming task, especially since potential vulnerabilities are …

Migrant Management In The "Calais Jungle". Intentional State Disengagement Or Expression Of The French Model Limitations?, Sarah Bekrar

Master's Theses

This thesis aims to explore the disparities between the French state’s apparent participatory efforts in the human rights regime and the exclusionary practices against migrants within the territory. What has been labeled “the European refugee crisis”- here in France, has exacerbated states’ anti-migrant behaviors of hyper securitization, politics of refoulement, and practices of burden shifting. Under the Geneva Convention of 1951 relating to the Status of Refugees and its 1967 Protocol, France, among 149 other signatories, has agreed to recognize and apply refugee rights as outlined by the Convention and to participate in the global effort to protect them. …

Envisioning Justice And Solidarity In The Household Workplace: The Organizing Power Of Immigrant Domestic Workers And Employers In The Bay Area, Nicole Laporte

Master's Theses

Domestic workers are skilled professionals who engage in a variety of activities ranging from housecleaning, elderly care and childcare support in private households. In the United States, it is estimated that there are over 2.5 million domestic workers, the majority of whom are immigrant women of color.[1] Due to the historic racialized and gendered exclusion from labor law protections such as the Fair Labor Standards Act of 1938, [2] the labor of domestic worker professionals has been made invisible in the United States. Today, domestic workers are three times as likely to be living in poverty and are less …

Exploring The Mechanism Of The Electrostatic Denaturation Of Double-Stranded Dna, Gayatri Raghu

Master's Theses

Electrostatic melting is an electrochemical tool that can be used to analyze the stability of DNA, allowing for the detection of various mutations in double-stranded DNA (dsDNA). Here, we explore the influence of electrostatic double layer formation on the unzipping of dsDNA to better comprehend the mechanism of this process. Previous studies by our lab show that the melting curve produced can distinguish between fully complementary 34-bp strands and a version of the same sequence in which one base pair has been replaced with a mismatch pair or detect and characterize the crosslinking of the dsDNA by anticancer drug cisplatin. …

The Inter-American Human Rights System In The Context Of Migration: Us Immigration Policies, Maira E. Delgado Laurens

Master's Theses

International human rights laws are critical to ensuring a minimum protection level for those migrating to other nations across the globe. Despite intense efforts by the United States to sidestep such policies while misrepresenting their repeated violations of human rights now taking place at the U.S.-Mexico border, these policies remain in full force in the global governance community. The actions of the Trump administration and others clearly indicate the need for political intervention to ensure such rights are maintained. Using qualitative content analysis and participatory observation, this article reviews the effectiveness of thematic hearings, under the Inter-American Commission on Human …

What Does It Mean To Be Palestinian? Understanding Palestinian Identity Through Narrative: Memories And Reflections From The Diaspora, Nidalia Nazzal

Master's Theses

This research will examine narratives of Palestinian identity throughout the diaspora and how such narratives are expressed, portrayed, and remembered. Out of 103 narratives included in the book, Being Palestinian: Personal Reflections on Palestinian Identity in the Diaspora (2016), edited by Yasir Suleiman, four narratives were selected for analysis, in order to examine common themes such as: diaspora, displacement, identity, erasure, and stigmatization. The four narratives selected are written by Palestinians of various ages and professions who have been exiled to other countries; these narrative speakers, two men and two women, share their personal experiences as Palestinians and what those …

Contextualizing Bipoc High School Students’ Racialized Experiences Under Trump, Christina Ung

Master's Theses

This thesis contextualizes public high school experiences of self-identified students of color during Trump’s presidency. The study features three recent high school graduates from the same campus, and their perspectives on a series of topics related to their racial identity. It was important that this research served as a space for marginalized voices to share their lived experiences, as they are frequently left out of American curriculum. More specifically in this case, the high school is located in a small, rural town where the population is majority white and politically conservative. Through the lens of critical race theory (CRT), data …

Hey Google: How Can We Build Critical Media Literacy?, Wilson Wang

Master's Theses

The year 2020 spotlighted problematic media coverage of the global coronavirus pandemic. Conflicting narratives of the origin of the “China virus” (Campbell & Park, 2020), the silenced journalistic freedoms (Davidson, 2020), and the impact on communities of color (Williams, 2021) created mass confusion during the global pandemic. To help address our understanding of media, teaching civic online reasoning (Wineburg & McGrew, 2017) and critical media literacy are two potential points of emphasis. Building critical media literacy helps resist the echo chamber effect of social media and cable news, which results in polarization and difficult mediation between parties (Bexley & Tchailoro, …

“What Did You See? We Didn’T See Shit”: Dialectics Of Protest And Resistance In Portland, Annika Bratton

Master's Theses

The murder of George Floyd sparked reinvigorated racial justice uprisings across the United States, coinciding with quarantine, pandemic, and mass unemployment, and in some places across the country, starting a fire of social unrest. Portland, Oregon received national attention for the protest efforts and mutual aid carried out by the community, while being met with brutality and violence at the hands of police. This thesis interviews five self-identified protesters from Portland, seeking answers to three central research questions: (1) What are the experiences of protesters who have been demanding racial justice on the streets in Portland since May of 2020? …

Recreation And The Sacred: A Case Study Of Diné Bikéyah, Brian Andersen

Master's Theses

The relationship between indigenous groups and outdoor recreation is something that has been analyzed by various scholars. In the North American context, scholars have primarily focused on conflicts regarding land use, particularly as it relates to the concept of the sacred. Although these works speak to general truths, the complexity of the relationship between outdoor pursuits and Native American groups is often over-simplified. This thesis analyzes the potential of outdoor recreation as a means of economic empowerment for the Navajo people. The work draws on the various initiatives currently underway to promote outdoor recreation in the Navajo Nation. These initiatives …

Memory And Identity: Inter-Generational Resilience And Construction Of Diasporic Identities Among Somali Refugees, Hamida Dahir Sheikh Ahmed

Master's Theses

The violence and displacement many refugees face often create a lifelong trauma that manifests in many ways within themselves, their families, and communities. The Somali refugee community in the United States is no different. Since their resettlement in America started in the 1990s following the civil war, the community has struggled with different manifestations of that trauma; substance abuse and gang violence among the youth, prominence of depression and suicide rates, rise of domestic violence, as well as other direct and indirect results associated with mental health. This is the reality of many refugee and immigrant communities, coming directly from …