Digital Commons Network^™

Strategic Selection Of Training Data For Domain-Specific Speech Recognition, Daniel Girerd

Master's Theses

Speech recognition is now a key topic in computer science with the proliferation of voice-activated assistants, and voice-enabled devices. Many companies over a speech recognition service for developers to use to enable smart devices and services. These speech-to-text systems, however, have significant room for improvement, especially in domain specific speech. IBM's Watson speech-to-text service attempts to support domain specific uses by allowing users to upload their own training data for making custom models that augment Watson's general model. This requires deciding a strategy for picking the training model. This thesis experiments with different training choices for custom language models that …

Zinc Sunscreens Affect Development Of Strongylocentrotus Purpuratus Embryos, Brittany E. Cunningham, Nikki L. Adams

Master's Theses

The growing popularity of physical sunscreens will also lead to an increased release of the ingredients from zinc oxide (ZnO) sunscreens into marine environments. Though zinc (Zn) is a necessary micronutrient in the ocean, greater than natural Zn concentrations are being released into marine environments by use of sunscreens. The extent of the consequences of the addition of Zn to the ocean are not fully understood. We investigated effects of materials released by zinc oxide (ZnO) sunscreens on the development of California purple sea urchin, Strongylocentrotus purpuratus. Embryos developed in various concentrations of Zn, the sources of which included …

Enhanced Detection Of Corrosion And Coating Aging Mechanisms Using Core-Shell Quantum Dots, Raymond Thai

Master's Theses

Understanding aging mechanisms in coatings during their servicable life is complicated, due to the inherent stochastic nature of exposure profiles, service environments, and rare weather events. Thus, the development of improved test methods for service life prediction and accelerated weathering relies on the availability of infallible degradation and exposure data, delivered as a function of cumulative time in service. In a related application, non-destructive evaluative methods rely on the premise of being able to probe or monitor in situ mechanisms within a coating system without interfering with actual aging mechanisms. Ultimately, quantumdots can be utilized as in situ sensors for …

Assessing The Photoprotective Effects Of Fluorescent Sphingomyelin Against Uvb Induced Dna Damage In Human Keratinocytes, Rebecca Marie Kandell

Master's Theses

Non Melanoma Skin Cancer (NMSC) affects 3.3 million Americans each year and results from Ultra Violet Radiation (UVR) damage to DNA in the form of pyrimidine dimers and photoproducts [1]–[5]. Cells directly detect the damage and initiate apoptosis, cell cycle arrest, or DNA repair by modulating p53 and p21 levels [6]–[9]. Current methods of photoprotection include sunscreen, but controversy over safety of some active ingredients necessitates research into more natural alternatives [10]–[12]. In particular, 24 hour incubation with bovine milk sphingomyelin (BSM) has demonstrated photoprotective potential by reducing p21 and p53 levels in keratinocytes (KRTs) after UV radiation [13], [14]. …

Extended-Use Ecg Monitor, Daniel Aaron Soski

Master's Theses

In this thesis, a prototype ECG monitor was developed that is integrated into an elastic shirt and takes a 3-lead ECG for over 5 days. The high-quality measurements can be used to identify markers indicative of various detrimental heart conditions. Measurements recorded by the device are encrypted and stored onto a micro-SD card. Current Holter monitors are expensive and have functional lives less than 48 hours; however, extended duration monitoring has been proven more useful in diagnosis. The device designed demonstrates that ECG measurements can be taken over longer durations without sacrificing quality, comfort, or device cost.

Prediction Of The Degradation Of Emerging Contaminants During Oxidative Treatment Via Analysis Of Reaction Rate Constants, Kellie Cochran

Master's Theses

Globally, water supplies are diminishing in quality while demand is continually increasing. The municipal water and wastewater sector has been paying increased attention to unregulated emerging organic contaminants. Advanced oxidation processes (AOPs), which produce hydroxyl radicles (•OH), have been developed and implemented to remove recalcitrant emerging contaminants left by conventional treatment processes. The current understanding of the removal efficacy of AOPs for emerging contaminants is limited. This study analyzes the ability of an AOP involving ozone and multi-walled carbon nanotubes (MWCNTs) in removing three specific emerging contaminants: caffeine, atrazine, and phenytoin, which were selected based on their persistence and ubiquity …

Determining Feasibility Of A Propulsionless Microsatellite Formation Flight Mission, Aaron Levis

Master's Theses

Benefits of developing missions with multiple formation flying spacecraft as an alternative to a traditional monolithic vehicle are becoming apparent. In some cases, these missions can lower cost and increase flexibility among other situational advantages. However, there are various limitations that are imposed by these missions that are centered on the concept of maintaining the necessary formation. One such limitation is that of the propulsion system required for each spacecraft. To mitigate the complexity and mass of the onboard propulsion, the pairing of electromagnetic actuators and differential drag to replace the functionality of a propulsive system is investigated. By using …

Study Of The Effect Of Biowish Aqua On Simultaneous Nitrification And Denitrification In A Membrane Aerated Bioreactor, Joelle Arakaki

Master's Theses

This research entails the investigation of the effects of a bioaugmentation product from BiOWiSH^® called Aqua, referred to as “Aqua” for the remainder of this paper, on the nitrogen removal rate in a membrane aerated bioreactor (MABR). This research was conducted using a MABR design that consisted of a silicone membrane and continuous flow airline with compressed air. The membrane system was designed to supply oxygen, creating an aerated layer at the membrane-biofilm interface and an anoxic layer at the biofilm-water interface. Laboratory experiments were conducted to compare the nitrogen removal rates of natural bacteria alone to natural bacteria …

Preparation Of Supramolecular Amphiphilic Cyclodextrin Bilayer Vesicles For Pharmaceutical Applications, Kate E. Frischkorn

Master's Theses

Recent pharmaceutical developments have investigated using supramolecular nanoparticles in order to increase the bioavailability and solubility of drugs delivered in various methods. Modification of the carbohydrate cyclodextrin increases the ability to encapsulate hydrophobic pharmaceutical molecules by forming a carrier with a hydrophobic core and hydrophilic exterior. Guest molecules are commonly added to these inclusion complexes in order to add stability and further increase targeting abilities of the carriers. One such guest molecule is adamantine combined with a poly(ethylene glycol) chain. Vesicles are formed by hydrating a thin film of amphiphilic cyclodextrin and guest molecules in buffer solution that mimics physiological …

Effects Of Using Clay Nanoparticles As A Soil Amendment To Remove Nitrate From Stormwater, Megan P. Abutin

Master's Theses

Development of urban areas continues to increase, disrupting the natural ecosystem and the pathways for water to drain into downstream water bodies. As the amount of impervious area increases, pollutants can accumulate on the surface and enter the water cycle by stormwater. In most cities, the stormwater flows into a storm drain that is discharged into a water body. Low Impact Development technology has been developed to treat stormwater prior to discharge downstream. A bioretention cell is used to treat stormwater pollutants such as nitrate, phosphorus, total suspended solids, and metals. Past research has indicated that the removal efficiency of …

Bird Abundance At Bird Feeders In Response To Temperature, Wind Speed And Precipitation During The Winter Season, Siddhant Kahal

Master's Theses

The goal of this project is to explore how 23 different bird species respond to 3 climatic attributes. These attributes are lower than average temperatures, wind speed and precipitation level. Information about the bird species and all of the data associated with them is provided by Project FeederWatch (PFW). This is a citizen based survey study that provides key information about bird species abundance through the use of backyard and community feeders. The study volunteers from across the United States and Canada monitor these bird feeders and note important information about the species such as the number of individuals seen. …

The Gods Have Taken Thought For Them: Syncretic Animal Symbolism In Medieval European Magic, Solange Nicole Kiehlbauch

Master's Theses

This thesis investigates syncretic animal symbolism within medieval European occult systems. The major question that this work seeks to answer is: what does the ubiquity and importance of magical animals and animal magic reveal about overarching medieval perceptions of the world? In response, I utilize the emerging subfield of Animal History as a theoretical framework to draw attention to an understudied yet highly relevant aspect of occult theory and practice. This work argues that medieval Europeans lived in a fundamentally “enchanted” world compared to our modern age, where the permeable boundaries between physical and spiritual planes imbued nature and its …

Finite-Difference Modeling Of The Batch Process Smoldering Combustion Of Wastewater, Laura H. Kawashiri

Master's Theses

A MATLAB model was developed for the smoldering combustion of wastewater in the context of a decentralized residential wastewater treatment appliance. Data from a batch process sewage smoldering experiment was simulated using implicit finite-difference approximations, assuming one-dimensional transient conductive heat transfer. The time-dependent temperature profiles within the column represented the main parameters of interest and were used to verify recoverable heat energy estimations. Given that the modeling method used for this thesis represents a unique approach, the assumptions and limitations of this model are thoroughly described in the context of reproducing results for other smoldering setups. A lack of convergence …

Polycommit: Building Better Habits Through Gamification, Elliot Fiske

Master's Theses

Computer-assisted learning is older than Turing machines, and constantly evolves as technology improves. While some teachers are resistant to using technology in the classroom, “e-learning” techniques are becoming more common in almost every school, from K-12 to universities. As technology becomes more widespread, it becomes crucial to examine the various methodologies of computer-assisted learning and find the techniques that are most effective.

This paper explores the effectiveness of one such methodology, spaced repetition. This technique applies to homework assignments available to students online. We include an exploration of several existing apps that use this technique, and introduce our own novel …

Utilizing Permanent On-Board Water Storage For Efficient Deep Space Radiation Shielding, Nathan Ryan Gehrke

Master's Theses

As space technologies continue to develop rapidly, there is a common desire to launch astronauts beyond the ISS to return to the Moon and put human footsteps on Mars. One of the largest hurdles that still needs to be addressed is the protection of astronauts from the radiation environment seen in deep space. The most effective way to defend against radiation is increasing the thickness of the shield, however this is limited by strict mass requirements. In order to increase the thickness of the shield, it is beneficial to make mission critical items double as shielding material.

The human rated …

Pink And Dude Chefs: Effectiveness Of An After-School Nutrition Knowledge And Culinary Skills Program For Middle School Students To Increase Fruit And Vegetable Consumption, Alyssa S. Vaziri

Master's Theses

The rate of overweight and obesity among adolescents aged 12-19 years has more than tripled since 1980, and disproportionately impacts low-income and marginalized populations. Reduction in adolescent obesity rates may result in decreased health risks, decrease healthcare costs, and increased quality of life. Effective intervention methods for adolescent participants have incorporated nutrition knowledge and culinary skill building into afterschool programs. This study examines whether building knowledge, skills, and confidence through a culinary intervention can improve adolescent participants’ choices of healthful foods through increased fruit and vegetable intake.

Pink and Dude Chefs (PDC) is an afterschool nutrition education and culinary skills …

Catheter Localization Utilizing A Sensor-Enabled Guidewire: Design Of A Proof-Of-Concept System, Adam Edward Evard

Master's Theses

The purpose of this thesis project was to develop a proof-of-concept system for tracking the tip of a catheter without an embedded electromagnetic sensor by utilizing a sensor enabled guidewire. The motivation for the project was a reduction fluoroscopy radiation dose for clinicians in the interventional cardiology lab and the extension of navigation technology to be used with a wider variety of interventional devices through the implementation of expanded capabilities of the Abbott MediGuide system. The focus of the project was on the development of a proof-of-concept system capable of using an external device to track relative guidewire and catheter …

Characterization Of Arterial Flow For Junctional Bleeding Control, Nick Bosio

Master's Theses

This study investigated reducing volumetric flowrate under steady flow conditions by varying lengths of compression with constant cross-sectional area and varying cross-sectional area reduction with constant length in order to better understand how to control junctional hemorrhaging. The hypotheses of this study were that length reduction will have little effect on volumetric flowrate and that cross-sectional area reduction would need to be approximately 80 percent in order to obtain bleeding control. The study found that length reduction has little effect on changing the flowrate. However, in order to obtain at least 80 percent reduction in flow, the area needs to …

Automated Pruning Of Greenhouse Indeterminate Tomato Plants, Joey M. Angeja

Master's Theses

Pruning of indeterminate tomato plants is vital for a profitable yield and it still remains a manual process. There has been research in automated pruning of grapevines, trees, and other plants, but tomato plants have yet to be explored. Wage increases are contributing to the depleting profits of greenhouse tomato farmers. Rises in population are the driving force behind the need for efficient growing techniques. The major contribution of this thesis is a computer vision algorithm for detecting greenhouse tomato pruning points without the use of depth sensors. Given an up-close 2-D image of a tomato stem with the background …

Comparative Analysis Of Physiological Measurements And Environmental Metrics On Predicting Heat Stress Related Events, Mckenzie Lee Barlow

Master's Theses

Exposure to high heat and humidity can lead to serious health risks, including heat exhaustion and heat stroke. Wet Bulb Globe Temperature (WBGT) and heat index have historically been used to predict heat stress events, but individualized factors are not included in the measurement. It has been shown that there is a relationship between cardiovascular measurements and heat stress, which could be used to measure heat stress risk on an individual level. Research has been done to find relationships between cardiovascular metrics in a workplace environment, however the study did not include the use of a controlled environment as a …

Investigation On The Dissociative Photoionization Mechanism Of Furfural, Investigation Of The Absolute Photoionization Cross Sections Of Three Potential Propargylic Fuels, And Ab Initio Analysis On Potential Superbases Of Several Hyperlithiated Species: Li3f2o And Li3f2(Oh)N (N = 1, 2, 3), Matthew Winfough

Master's Theses

This thesis presents the study photoionization cross sections of three different propargylic biofuels; dipropargyl ether, propargyl alcohol, and propargylamine, in chlorine radical-initiated combustion experiments at the Chemical Dynamics Beamline (9.0.2) at the Advanced Light Source of the Ernest Orlando Berkeley National Laboratory in Berkeley, California. Additionally, the unimolecular dissociative photoionization mechanism of furfural was studied using photoelectron photoionization coincidence (PEPICO) spectroscopy at the vacuum ultraviolet beamline at the Swiss Light Source of the Paul Scherrer Institut in Villigen, Switzerland. Dissociation products and mechanisms for furfural were identified over a photon energy range of 10.9 to 14.5 eV. Lastly, a study …

Damage Detection In Textile Composites Via Piezoelectric Admittance Methods, Sazid Irfan Ahmed

Master's Theses

Structural health monitoring of aerospace structures is becoming vital as lightweight composite materials are increasingly used in aero-structures. Composites have various types of failure modes, which make it even more important to identify fault or damage compared to isotropic materials. Therefore, on-site health monitoring is one of the most preferred methodologies for detecting internal crack or damage at its initial stage to enhance operating safety and reduce repair cost. Recently, piezoelectric transducers are on high demand for on-site health monitoring because of its high bandwidth sensitivity. They simultaneously perform as actuators and sensors and embedded in the structure for real …

Barriers To Dental Care For Children With Autism Spectrum Disorders, Nidhi Taneja

Master's Theses

Aims: To investigate barriers to dental care for children with autism spectrum disorder (ASD) from dentists’ and caregivers’ perspective.

Methods: This paper documents two cross sectional surveys of barriers to treating children with ASD. 109 general dentists were surveyed at a national conference in study 1, of whom about 74% reported treating children with ASD. In study 2, 83 caregivers were surveyed in hospital clinics, 46 of whom had a child with ASD, and 37 had children without ASD, and acted as a control group. Results: The most commonly endorsed barriers perceived by general dentists were: lack of guidelines …

Testimonies Of Identity And Intimate Partner Violence, Jamie Berrien

Master's Theses

Intimate Partner Violence (IPV) is an epidemic that has impacted millions of women in our country. IPV is found in every community and impacts women from all races, ethnicities, religion, background, and socio-economic status. Yet, research shows that women in the United States who are not a part of the dominant culture experience IPV at a much higher rate than white women. This study focuses on the sacred testimonies of six women who have experienced IPV, as well as an analysis of the women's identities and other forms of oppression which impacts her experiences and survival of the violence.

Impact Of Cooperative Membership On Members' Household Economies: The Case Of Chiapas Coffee Farmers, Stephen Pitts

Master's Theses

Coffee producers typically sell raw coffee beans as the first step in a global value chain. Recently, groups of producers have formed coffee cooperatives that attempt to regain market power by integrating the other steps of the value chain. This study uses matching to estimate the effect of membership in one such cooperative on the household economy of indigenous coffee producers in the state of Chiapas, Mexico. It contributes to the literature by considering new determinants of participation and outcomes of interest. First, social capital at the individual and village level is correlated with cooperative membership more than other demographic …

Overlooking Men And Boys In Forced Criminality At The Border: A Content Analysis Of Human Trafficking Training And Awareness Materials, Eric Beasley

Master's Theses

Executive Summary

In the Post 9/11 era, where American security is intimately linked to a militarized border management system designed to protect the United States and its territories from threats of terrorism, illegal drugs, and illegal immigration, the media continues to perpetuate the 'Latino Threat Narrative'. The images and information offered to us for consumption help us construct an understanding of events, people, and places. This paper explores how the 'Latino Threat Narrative' and inherent gender biases shape how the Department of Homeland Security (DHS) understands vulnerability and identifies human trafficking victims, particularly men and boys from Mexico and Central …

Sweden's Great Escape: Industrialization And The Changing Productivity Cost Of Winter, Charlotte Taylor, Jesse Anttila-Hughes

Master's Theses

We combine a paleoclimate reconstruction of the North Atlantic Oscillation (NAO)- a key determinant of Scandinavian winter intensity- with four centuries of historical production data from Sweden, to examine the changing influence of climate variability on production over time. We find the colder, drier winters associated with the negative phase of the NAO led to reduced economic production for much of Swedish history, and that this relationship changed with development: during industrialization, Sweden underwent a transition from ‘level’ effects, where harsh winters lowered average incomes, to ‘growth’ effects, where it reduced growth in improving living standards. Post-industrialization, neither ‘level’ nor …

Bi Or Multilingualism And Its Curriculum For Children With Sli, Jeongmin Ryou

Master's Theses

The purpose of this project, which is based on SLI children age 3-6, is to inspect the possibility of bi- or multilingualism on SLI children and to create a curriculum, which consists of six modules, accordingly. It includes a variety of visual and auditory materials for each module, offers well-tailored daily lesson, and helps children with SLI learn the target language simply and easily. This project provides tips for teachers and can be also referenced when a teacher creates his or her own curriculum. Each module is flexible and should be tailored to the individual, while also being facilitated to …

Opportunities Beyond High School: An Eld Unit For Newcomer Students, Karen Toepp

Master's Theses

As an English Language Development (ELD) teacher, I noticed the junior newcomer students at my high school in the Bay Area of California were not being prepared for jobs or careers after their graduation. As newcomers, they are working through trauma, reuniting with their families, learning a new language and adapting to a new culture. Though many arrived with high expectations for school, students stopped connecting graduating high school with having access to higher education, which meant more job training and better employment opportunities. A lack of motivation and unskilled teachers contributed to students struggling in school and leading to …

Boosting Demand For Biofortified Foods: The Case Of Orange Fleshed Sweet Potato Bread In Tamale, Ghana, Tchassanty Ouro-Gbeleou

Master's Theses

Abstract: In the context of introducing biofortification of staple crops as a food-based approach to combat micronutrient malnutrition in Sub Saharan Africa (SSA), we carried out a survey in Tamale, Ghana to elicit consumers’ preference of and willingness to pay for one of the highly nutritious biofortified staple crop processed product: the Orange Fleshed Sweet Potato (OFSP) bread. Our results indicate that scores of respondents in the sample show preference for OFSP bread. The most important determinants of OFSP bread preference are its sweet taste and soft texture and consumers are willing to pay 0.634 pesewas more for the attribute …