Digital Commons Network^™

Physical Layer Security For Mimo Wireless Systems, Joseph R. Childress

Master's Theses

A steadily growing portion of modern communication systems in use today is based on wireless technologies that make use of smaller and more portable electronic devices. As a result, the need to provide a light-weight security strategy for these systems is becoming a more important problem. This thesis focuses on two techniques that belong to an active research area known as Physical Layer Security (PLS). While the underlying techniques of PLS have been known for some time, the potential secrecy benefits of them need further investigation. These potential benefits have generated a rising interest with the development of Multiple Input …

The Real-Time Application Of Control Theory To Pharmacokinetics, George W. Carpenter Iii

Master's Theses

An optically-based injection control system has been developed as a proof-of- concept that such is of use for an intravenous drug delivery application. Current clinical drug delivery for oncology typically provides for intravenous administration without providing awareness of achieved plasma concentration, yet interpatient variability produces consequences ranging from toxicity to ineffectual treatments. We report a closed loop injection system integrating a pulse-photoplethysmograph to measure the concentration of indocyanine green (ICG) in the circulating blood of a one-compartment murine model. A proportional-derivative (PD) controller manages the injection rate in real-time. The target function for the controller is the population estimate of …

The Effects Of A Low-Glycemic Index Diabetes Management Program On Weight, Body Mass Index, Triglycerides, Cholesterol And Hemoglobin A1c Values, Morgan Williston

Master's Theses

The purpose of this study was to evaluate effects of a low-glycemic index diet on weight, body mass index (BMI), triglycerides, cholesterol levels, and hemoglobin A1c

(HbA1c) following participation in a 12-hour outpatient diabetes self- management education (DSME) program. This DSME program is unique as it

focuses on a low-glycemic index diet rather than the traditional carbohydrate consistent diet to control blood glucose levels. Health outcomes obtained post participation were compared to baseline data. Participants were 283 individuals with type 2 diabetes including 94 (33%) men and 189 (67%) women, with a mean baseline HbA1c of 8.7 ±2.2%. Statistically significant …

Cost-Effectiveness Analysis Of Colorectal Cancer Screening Strategies Using Active Learning And Montecarlo Simulation, Amirhosein Fouladi

Master's Theses

Colorectal cancer (CRC) is one of the deadliest types of cancer in the US due to its high incidence and mortality rates. Detection of CRC in the early stages through available screening tests increases the patient's survival chances. In this study, we investigate the cost-effectiveness of a wide variety of multi-modal CRC screening policies. More specifically, we develop a Monte Carlo simulation framework to model the CRC natural history and preventive interventions. Age-specific and size-specific progression rates of adenomatous polyps are estimated using an innovative active learning method. Specifically, we develop a decision tree model to estimate size-specific and age-specific …

Surface Engineering Solutions For Immersion Phase Change Cooling Of Electronics, Brendon M. Doran

Master's Theses

Micro- and nano-scale surface modifications have been a subject of great interest for enhancing the pool boiling heat transfer performance of immersion cooling systems due to their ability to augment surface area, improve wickability, and increase nucleation site density. However, many of the surface modification technologies that have been previously demonstrated show a lack of evidence concerning scalability for use at an industrial level. In this work, the pool boiling heat transfer performance of nanoporous anodic aluminum oxide (AAO) films, copper oxide (CuO) nanostructure coatings, and 1D roll-molded microfin arrays has been studied. Each of these technologies possess scalability in …

Effects On Strength And Corrosive Characteristics Of Hardened Cement Paste Using Rice Husk And Sugarcane Bagasse, Travis D. Garrett

Master's Theses

Cement is one of the most used building materials in the world. The production of ordinary Portland cement contributes to the release of harmful greenhouse gasses. In an effort to reduce these emissions, different materials are being evaluated for their use as partial replacements for ordinary Portland cement. Rice husk and sugarcane bagasse are agricultural waste products and large amounts of these are currently landfilled, making them inexpensive and available. When combusted at high temperatures they form rice husk ash and sugarcane bagasse ash that have pozzolanic characteristics. The high silicon dioxide in these products makes them good options to …

Establishing The Validity Of The Polar V800tm Heart Rate Monitor Among Adults With Hypertension, Burak Talip Cilhoroz

Master's Theses

No abstract provided.

Mapping Relict Charcoal Hearths In The Northeast Us Using Deep Learning Convolutional Neural Networks And Lidar Data, Eli Anderson

Master's Theses

Advanced machine learning combined with widespread, publicly available, airborne light detection and ranging (LiDAR) data has great potential to automate the extraction and classification of landforms and 17^th-early 20^th century land use features preserved under forest canopy throughout the northeast US landscape. Previous studies have shown that stone walls, house foundations and relict charcoal hearths (RCHs) stand out clearly in derivative LiDAR digital elevation model (DEM) products such as slope and hillshade maps, but to date, mapping has been mainly carried out by on screen digitization. In this study, a deep learning convolutional neural network (CNN) algorithm …

Food Systems Adverse Health Impacts On Latinx Immigrant Communities By Lisa Marquez, Lisa Marquez

Master's Theses

This thesis focuses on the adverse health impacts food systems have on Latinx immigrant communities. Marquez looks closely at emergency services programs using the food bank run by the Our Lady of the Pillar in Half Moon Bay, California, and interviewed five Latina immigrants from Mexico and Central America. While the food banks provided these families with fresh produce, the women expressed that it is substandard to the produce in their home countries. The interviews are supplemented with the analysis of three spoken word poems by youth who are second generation or whom have spent the majority of their lives …

Empowering Female Entrepreneurs Through Mentorship In Medellin, Colombia: Results From The Field, Theresa Solenski

Master's Theses

Utilizing the power of local knowledge and peer networking, this study attempts to quantify the impacts of mentorship among female micro-entrepreneurs in Medellin, Colombia on empowerment. Developing countries such as Colombia have disproportionately high rates of unprofitable micro-businesses, many of which are managed by women. Internal constraints, such as disempowerment, play a central role in perpetuating poverty. We implement a 6-month mentoring intervention by pairing 18 successful entrepreneurs with 52 disadvantaged female, micro-entrepreneurs in Medellin, Colombia to measure the additional benefit of localized knowledge to micro-borrowers. Using a process of random assignment, I measure the change in female empowerment, measured …

Measuring Cocoa Agricultural Productivity: A Spatio-Temporal Econometric Approach, Yurlady Chaverra-Palacios

Master's Theses

A significant increase of 50.5 percent in the national production of cocoa was registered between 2011 and 2015 in Colombia. Nevertheless, 5,890 tons were imported in 2015 to supply domestic demand. Unlike other crops, the production of cocoa has made a significant contribution to the income of approximately 38,000 families of which 90 percent are small farm-producers with very little capital. Facilitating credit for investment is one of the main strategies of the national government to increase cocoa productivity. Correspondingly, the impact of the credit for investment on the cocoa agricultural productivity and if those investments have a spillover effect …

The Impact Of Cleft Lip/Palate And Clp Surgical Intervention On The Social Integration Of Adolescents In India, Mustafa Zahid

Master's Theses

Cleft Lip/Palate, a congenital orofacial anomaly, carries an incidence rate of approximately 1 in every 1000 births. In addition to the stigma associated with the condition, the varying levels of cleft severity might result in lower life outcomes which could include lower cognitive ability, physical and psychological well-being, social and behavioral outcomes of adolescents. This paper focuses on the social integration element of life outcomes, which is composed of the social inclusion and prosocial behavior of the adolescent. Despite the affordability of restorative surgeries, patients in rural areas of Low and Middle-Income Countries (LMICs) such as India face accessibility and …

Indigenous Women's Bodies: Primer Territorio De Defensa, Ana Gabriela Avalos Tizol

Master's Theses

The teen pregnancy “epidemic” in Guatemala is a focal point when international and national NGOs demand that the government protect the civil and political rights of girls. In accordance, the state created laws (legal age for marriage - Ordinance 13-2017), implemented penal codes (statutory rape - Article 173) and created Programa Vida (conditional cash transfer of Q. 1,500 - $200 every two months) to address this ‘epidemic.’ Yet, only sixty-one teen mothers were involved in the program by the first year in 2018, indicating its inaccessibility. This thesis proposes to challenge the dominant narrative on teenage pregnancies, which blames “Mayan …

Economic Shocks And Personality Traits Of The Ultra-Poor, Shikhar Mehra

Master's Theses

Personality characteristics and non-cognitive skills are strong determinants of decision- making and economic outcomes. Personality is commonly believed to be stable, especially after age 30, though some evidence exists that changes in occupational or social roles, or exposure to family or health shocks, can change an individual’s personality traits in the medium or long term. Evidence on short-term impacts of shocks on personality, however, is lacking, as is evidence from rural and less educated populations. In this paper, we study the short-term effects of two kinds of shocks on personality traits among young adults from ultra-poor households in Uganda. In …

Shifting Views: How Experiential Learning Shapes University Students’ Sense Of Civic Engagement And Solidarity On Migration, Karen Larke

Master's Theses

Higher education institutions have put more weight on the use of experiential learning to provide students with opportunities to grow intellectually and develop as engaged citizens. Many recent studies have looked at the quality and educational impacts of a variety of experiential and service learning experiences, yet few have explored what other ideological impacts may result from specific non-curricular experiential learning experiences. This study measured the impact of experiential learning, in the form of week-long migration-themed trips, on undergraduate student’s self-reported levels of solidarity, and related measures of civic engagement and political engagement and activism around migration issues. This study …

Facilitating Greenhouse Gas Reduction And Climate Change Adaptation Within The Coastal Zone: A Policy Analysis For The California Coastal Commission, Nicole Young

Master's Theses

California is already experiencing impacts to its coastline due to climate change, and more severe impacts are anticipated if greenhouse gas emissions continue to rise. These climate change impacts are especially strong within the California coastal zone, which falls under the jurisdiction of the California Coastal Commission. The Commission has a history of rigorous environmental protection and is committed to protecting California’s coast through proactive planning and regulation, however they will need to initiate coastal policies with ambitious targets to facilitate effective climate change adaptation and mitigation. This study analyzed existing California climate policies and Coastal Commission policies to identify …

Frogs Hiding In Plain Sight: Phylogenetic Systematics Of Myanmar’S Occidozyga Species Complex, And The Identification Of A Novel Species, Allison Bogisich

Master's Theses

Different species can be difficult to distinguish from one another when they are morphologically similar. Such cryptic species are the reason many anuran species go undetected. For this study, the taxonomic identity of the Occidozyga complex across Myanmar was investigated. An integrated approach was used combining molecular, morphological and phylogeographic data to better assess its taxonomy. Results indicate the presence of three new candidate species within Occidozyga, and three evolutionarily significant unit (ESU) lineages. Two mitochondrial gene fragments (16S, COI) and one nuclear gene fragment (Rhodopsin) were examined from DNA isolated from forty-seven preserved specimens from the California Academy …

Survival Migration & The Need For Just Policies And Front-Line Leadership In Climate Change And Migration, Nik Evasco

Master's Theses

Abstract:

This paper explores the growing phenomenon of migration due to climate change through an analysis of human rights and a review of international conventions. It argues that current migration, refugee and asylum regimes at the regional and international policy levels are inadequate to serve the needs of individuals, families and communities that are preemptively relocating or are forced to migrate due to climate change and its subsequent effects. This paper shows that environmentally-displaced migrants who are either forcibly displaced or preemptively migrating do not have sufficient recognition or legal or political protections compared to ‘traditional’ refugees or migrants. The …

Wildfire Exposure To Critical Habitat Of Endangered And Threatened Species In California, Kristin Butcher

Master's Theses

Researchers, fire ecologists and wildlife managers are concerned about impact to endangered and threatened species and their critical habitat due to the projected increase in future wildfires. Wildfires have been studied in California for the last six decades and have been increasing at an alarming rate since the 1980’s. In this study, I use the 2018 spatial dataset for critical habitat of federally endangered and threatened species located in the state boundaries of California and compare it to a spatial dataset for wildfires that have occurred over the span of 32 years (1984 to 2016). Trends are derived from spatial …

Examining Genetic And Ecological Differentiation Of An Endemic Plant Species Found Across The Hawaiian Archipelago, Psychotria Mariniana, Tiffany L. Kho

Master's Theses

Speciation is a fundamental evolutionary process that remains poorly understood. Speciation ultimately begins with population divergence, so we can elucidate the complexities of speciation by first understanding the process and drivers of population divergence. To conduct population-level analyses, ecologists and evolutionary biologists have turned to island systems, primarily for their geographic orientation and high endemism. The Hawaiian archipelago is home to over 8,700 endemic species making it a great natural laboratory to study species diversification at the population level. The Hawaiian Psychotria (kōpiko, or wild coffee) make up 11 of these species and have been used to understand colonization and …

Play Behavior And The Development Of Boldness And Caution In Juvenile Belding’S Ground Squirrels (Urocitellus Beldingi), Madelene Shehan

Master's Theses

The ubiquity of play among juvenile mammals suggests it provides adaptive benefits, potentially through influences on the development of temperament in young animals. Juvenile Belding’s ground squirrels (Urocitellus beldingi) must balance competing demands for boldness and caution imposed by the fundamental trade-off between their short active season and their vulnerability to predation. In this study, I evaluated whether play helps to facilitate the development of an appropriate balance between boldness and caution in juvenile U. beldingi.I observed the play behavior of juvenile U. beldingiand conducted flight-initiation distance tests to measure boldness-caution at the beginning and toward …

Cariño In The Clase: Understanding How Teachers And Staff In San José Navigate Caring, Protecting, And Empowering Undocumented Latinx High School Students In The Trump Era, Nancy Haro

Master's Theses

Latinx students in low-income public schools face structural oppression that limits their educational and career opportunities. Those opportunities are further limited when we consider how many of those students might be undocumented. The current political climate is replete with anti-immigrant sentiment and has already created further difficulty for undocumented students with the recession of Deferred Action for Childhood Arrivals (DACA). Public high school teachers and staff play an important role in the lives of these students, for they interact in a space in which preparation for adulthood is the goal. However, these spaces do not exist in a vacuum but …

The Behavioral Determinants Of Well-Being In Sierra Leone, Madison Levine

Master's Theses

Ensuring the needs of individuals are met leads to a more prosperous economy. Healthy economic activity is dependent on a supported community of people. These people express different levels of happiness depending on where they come from and make behavioral choices every day influenced by their association with their community. Currently most subjective data have come from western educated industrialized rich and democratic (WEIRD) areas. These results are placed as generalizations across all other countries and are not giving an adequate representation of well-being for the population in non-WEIRD areas. Our study outlines an in-depth survey covering subjective well-being measurements …

Temperature And Tempers: Heats Impact On Mood And Language, John Sutton

Master's Theses

Abstract: Temperatures above 20° Celsius have shown to adversely impact human behavior, leading to increased aggression and violence. Climate change will contribute to both the magnitude and severity of this pattern as temperatures continue their rise. Contributions to this field of research have only recently begun to analyze online behavior and language as a proxy for hedonic state, or well-being. From a development perspective this study is relevant since the poor tend to live in some of the warmest regions on earth, and would thus be disproportionately impacted by increased temperatures. We use several sources of data; U.S. based …

Mentoring Female Entrepreneurs: Revenue Analysis, Candy M. Moreno Garcia

Master's Theses

Throughout the world, significantly less women own businesses than their male counterparts. In addition, they tend to own businesses that are smaller, have less growth, are less profitable and have lower sales turnover than those of men. Supporting female entrepreneurs is crucial as they tend to spend more on the health of the household, nutrition and education. This paper uses a randomized controlled trial to determine the impact of a mentorship program between experienced female entrepreneurs and inexperienced entrepreneurs, specifically focusing on the impact to profits. I use data collected from three rounds of survey over the course of six …

The Long-Run Effects Of Tropical Cyclones On Infant Mortality, Isabel Miranda

Master's Theses

In the United States alone, each tropical cyclone causes an average of $14.6 billion worth of damages. In addition to the destruction of physical infrastructure, natural disasters also negatively impact human capital formation. These losses are often more difficult to observe, and therefore, are over looked when quantifying the true costs of natural disasters. One particular effect is an increase in infant mortality rates, an important indicator of a country’s general socioeconomic level. This paper utilizes a model created by Anttila-Hughes and Hsiang, that takes advantage of annual variation in tropical cyclones using annual spatial average maximum wind speeds and …

Are Menstrual Cycles A Biological Determinant Of Well-Being Amongst Sierra Leonean Schoolchildren?, Ashwini Shridhar

Master's Theses

The influence of hormones and biology on behavior is a topic that is rife with controversy, especially when it comes to sexual hormones. There is even more murkiness when it comes to the topic of menstruation and knowledge about women’s menstrual cycles. Recent research on this topic have seen a link between the hormonal fluctuations during menstrual cycles and various behavioral implications on competition, cooperation, and risk behavior. This study tries to expand existing knowledge by examining whether there is a link between hormonal fluctuations during menstrual cycles and risk preferential behavior using economic experiments in the largely understudied context …

Captive Nations: Measuring Economic Growth On Native American Reservations In California, Mahsa Ashabi

Master's Theses

A history of institutional oppression and genocide has shaped Native American communities across the United States today, reflected in large disparities of socioeconomic outcomes and infrastructure. Due to a lack of comprehensive data and macroeconomic research, alternative forms of spatial data and theories regarding human settlement are needed to develop an understanding ofthis stagnation. In our efforts to better understand growth on Native American reservations, we utilize nighttime lights data to proxy for economic output in these geographic areas, measuring the settlement characteristics ofreservations themselves and against surrounding U.S. regions. Through a series of log-log regressions that focus on Zipf’s …

The Effect Of Disability Status On Parental Input: A Study From India, Susann Skjoldhorne

Master's Theses

Human capital has for a long time been an important factor in economic growth theory. Previous literature shows a strong connection between parental input and the level of human capital attained by a child. The investment in child health and education has a positive effect on building human capital. When resources are scarce the allocation of resources will affect the opportunities that a child is given to achieve their potential. Gender preferences, birth order, and disabilities could all be factors that explain how parents chose to allocate their resources. Previous studies show that the distribution of parental input based on …

Financial Red Flags: Empirical Mapping Of Firm Political Preferences By Sector In Mexico, Ian Connors

Master's Theses

Can the stock market be used to determine the political preferences of individual economic sectors? This paper explores the conceptual relationship between electoral outcomes and financial markets in Mexico. Specifically, it analyzes how financial markets predict the expected effects of a given political platform on the performance of firms within specific sectors. To do this, the study used event-study methodology to calculate abnormal returns on stock prices across the nine sectors listed on the Bolsa Mexicana de Valores stock exchange following the historic election of leftist candidate Andrés Manuel López Obrador (AMLO), On July 1, 2018. However, despite the uncertainty …