Digital Commons Network^™

Optical Characterization Of Liquids: Refractive Index And Raman Gain Coefficient Measurements, Cesar A. Lopez-Zelaya

Graduate Thesis and Dissertation 2023-2024

Novel technologies capable of generating wavelengths not accessible with typical laser gain media have been among the primary drivers of the field of nonlinear optics. Here, we are interested in the linear and nonlinear properties of liquids beyond the visible spectrum, motivated in part by their use as core materials in optical fibers. Given their dispersion, nonlinearities, transparency, and ability to be mixed, liquids show potential for exploiting in-fiber nonlinear phenomena for developing the new generation of low cost, size, weight, and power wavelength-agile fiber-laser sources. For the design, modeling, and experimental realization of these liquid-core fiber laser sources, proper …

Towards A Holistic And Comparative Analysis Of The Free Content Web: Security, Privacy, And Performance, Abdulrahman Alabduljabbar

Electronic Theses and Dissertations, 2020-2023

Free content websites that provide free books, music, games, movies, etc., have existed on the Internet for many years. While it is a common belief that such websites might be different from premium websites providing the same content types in terms of their security, a rigorous analysis that supports this belief is lacking from the literature. In particular, it is unclear if those websites are as safe as their premium counterparts. In this dissertation, we set out to investigate the similarities and differences between free content and premium websites, including their risk profiles. Moreover, we analyze and quantify through measurements …

Employee Volunteering: Integrating The Volunteering And Helping Literatures Using A Latent Profile Approach, Emily Broksch

Electronic Theses and Dissertations, 2020-2023

In recent years, more and more organizations are being held responsible for the social impact of their organizational priorities, commonly referred to as corporate social responsibility. As a result, there has been an increased implementation of employee volunteering initiatives. However, research on volunteering has largely remained separate from the context of work. As the prevalence of employee volunteering initiatives continues to grow, the need to integrate the theoretical and practical findings from the volunteering literature with that of the extensively studied and related discretionary prosocial work behavior (i.e., organizational citizenship behavior) research has become increasingly apparent. This dissertation examines how …

The Successful Characteristics That Contribute To Black Male Students Matriculating Into Medical School, Cedric Brown

Electronic Theses and Dissertations, 2020-2023

In 2019, individuals that identified as Black represented 13.4% of the U.S. population, 12.5% of the undergraduate student enrollment population and 7.1% of the medical school population. Subsequently, this has yielded a 5% Black physician population and workforce consisting of just 2.3% Black male physicians (AAMC, 2018). The disproportionately low Black physician representation contributes to greater healthcare disparity outcomes within the U.S. Black population. This study is centered on the post-positive characteristics of Black male medical students that have successfully overcome barriers to entry and matriculated into medical school. The phenomenological post-positive study was conducted through the lens of Self-Efficacy …

Determination Of Damage Initiation Mechanisms In Aerospace Alloys Due To Stress Corrosion Cracking Via In-Situ Microscale Characterization Techniques, Remelisa Esteves

Electronic Theses and Dissertations, 2020-2023

Aluminum alloys are used on aerospace vehicles due to their high strength-to-weight ratio, formability and machinability. However, they become vulnerable to stress corrosion cracking (SCC) during their service life. SCC is primarily caused by the material's stress condition, a suitable corrosive environment and material susceptibility. It is also influenced by a mixture of electrochemical, mechanical, and chemical factors. Due to the complexity of SCC, tools with better resolution and sensitivity are needed to better understand the impact and interaction of the contributing factors. A vast amount of research has been done to study SCC behavior, but the scale of characterization …

Developing A Physics-Informed Deep Learning Paradigm For Traffic State Estimation, Jiheng Huang

Electronic Theses and Dissertations, 2020-2023

The traffic delay due to congestion cost the U.S. economy $ 81 billion in 2022, and on average, each worker lost 97 hours each year during commute due to longer wait time. Traffic management and control strategies that serve as a potent solution to the congestion problem require accurate information on prevailing traffic conditions. However, due to the cost of sensor installation and maintenance, associated sensor noise, and outages, the key traffic metrics are often observed partially, making the task of estimating traffic states (TSE) critical. The challenge of TSE lies in the sparsity of observed traffic data and the …

Error Rate Determination Of Latent Print Chemistry Via 1d And 2d Gas Chromatography, Jessica Kindell

Electronic Theses and Dissertations, 2020-2023

Latent print evidence collected from crime scenes are analyzed and compared by examiners using the ACE-V protocol (Analysis, Comparison, Evaluation-Verification) to identify potential suspects. However, smudged and poor-quality prints, usually deemed inconclusive, could be utilized for source association or discrimination based on the chemistry of the oils and sweat that comprises the latent print residue (LPR). For this research, LPRs were collected from various places on the face and analyzed via two-dimensional gas chromatography-mass spectrometry (2D GC-MS), one-dimensional (1D) GC-MS, and direct analysis in real time-high resolution mass spectrometry (DART-HRMS). LPR recovery with two common sample preparation methods, derivatization and …

High-Efficieny Ultrafast Mid-Infrared Source For Strong Field Science, Fangjie Zhou

Electronic Theses and Dissertations, 2020-2023

The potential of high-energy sources within the mid-infrared region (3-8 μm) has garnered significant attention for diverse research and industrial applications. Millijoule pulses extending beyond 3 μm can facilitate the production of x-rays with photon energies in the keV range through high harmonic generation (HHG). These high-energy x-ray pulses enable the characterization of electron dynamics within molecules and condensed matter materials. Additionally, the atmospheric transmission window between 3-5 μm allows lasers within this spectral range to deliver energy efficiently to distant targets via optical filaments without divergence, highlighting promising prospects for defense applications. In contrast to laser amplifiers, which are …

Understanding Outgroup Aversion Effects On Innovation Adoption And Polarization In Network Environments, Bruce G. Miller

Graduate Thesis and Dissertation 2023-2024

Individuals' decisions to adopt an innovation can be influenced by the group identity of previous adopters or non-adopters in their social network. Previous research in innovation diffusion considered initial innovators and word-of-mouth imitator effects using analytical models. Simulations and agent-based models have been developed to address the heterogeneity of decision makers and the non-linearity of the process. A further refinement modeled adoption based on networks of social relationships between potential decision makers, analogous to the spread of disease on networks. In addition, adoption or non-adoption of some innovations has been characterized as a means of signaling identification with or aversion …

Patterns Of Risk Behaviors And Their Value: A Latent Class Growth Modeling Approach, Anthony Naranjo

Graduate Thesis and Dissertation 2023-2024

The current body of individual risk behavior research has been mainly driven by two streams of literature. Stable risk researchers propose individuals tend to display similar risk behaviors across time and situations due to individuals' underlying propensity to either engage in risk averse or risk seeking behaviors. Changeable risk researchers have sought out to examine variability in risk behaviors due to factors such as personality and contextual characteristics. However, might it be the case that there are subgroups of individuals who may be more prone to display static risk behaviors and other subgroup whose risk behaviors are more amendable? To …

Student Perceptions Of Campus Crime And Victim Services, Tracy Gulliford

Graduate Thesis and Dissertation 2023-2024

Few would argue that college campus crime is a serious problem across the United States. Debate arises, however, regarding why the problem is so pervasive and how best to address it. This dissertation addresses that gap by exploring the nature and magnitude of the college campus crime problem followed by a rationale for studying student perceptions regarding knowledge about and use of victim services resources offered on the University of Central Florida (UCF) campus. Doing so is particularly important in light of the fact that five years have now passed since UCF launched the "Let's Be Clear" campaign designed to …

Classification Of Adult Income Using Decision Tree, Roland Fiagbe

Data Science and Data Mining

Decision tree is a commonly used data mining methodology for performing classification tasks. It is a tree-based supervised machine learning algorithm that is used to classify or make predictions in a path of how previous questions are answered. Generally, the decision tree algorithm categorizes data into branch-like segments that develop into a tree that contains a root, nodes, and leaves. This project seeks to explore the decision tree methodology and apply it to the Adult Income dataset from the UCI Machine Learning Repository, to determine whether a person makes over 50K per year and determine the necessary factors that improve …

Analyzing The Impact Of Health, Economic, And Demographic Factors On Life Expectancy: A Comparative Study Of Developed And Developing Countries, Mahyar Alinejad

Data Science and Data Mining

This study presents a comprehensive analysis of three prominent machine learning regression models—Random Forest, XGBoost, and Support Vector Machine (SVM)—in the context of predictive analysis. Leveraging a carefully curated dataset, we explore the impact of various hyperparameters on model performance through an exhaustive tuning process. The Random Forest and XGBoost models exhibit robust predictive capabilities, with the former revealing notable insights through feature importance visualization. Additionally, SVM, optimized via GridSearchCV, demonstrates competitive performance. Evaluation metrics, including Mean Squared Error and R-squared, facilitate a thorough comparison of model efficacy. Results highlight nuanced strengths and weaknesses, informing practitioners on the suitability of …

Diamond's Hidden Gems - Stars, Diamond Williams, Ucf Libraries

Libraries' Documents

Publishing student work through journals and magazines is a difficult feat, often requiring rounds upon rounds of revisions. UCF has a way for you to share your work while providing you with tools to assist with the publication process. Continue below to read about UCF's own digital repository. UCF's Showcase of Text, Archives, Research & Scholarship (STARS) provides access to works by, for, and about UCF as broadly as possible, and for as long as possible. The intention is to provide free, open access to a worldwide audience. It is an institution-wide digital repository managed by the UCF Libraries.

STARS …

Diamond's Hidden Gem - Lunar New Year, Diamond R. Williams

Libraries' Documents

Whether you're visiting the John C. Hitt library or simply walking through, you've probably noticed the latest exhibit on the art wall, as well as several exhibit cases. This display depicts the Lunar New Year, also known as the Chinese New Year exhibit, and will be up until the end of January!

Below, I briefly describe the festival and how UCF Library intends to celebrate with students!

Diamond's Hidden Gems - Library Hours, Diamond R. Williams

Libraries' Documents

While you can usually count on the John C. Hitt Library to be open, there are some days when library hours change.

This is usually done to accommodate national holidays, football games, intersession, or finals week. You can also expect late-night (for some, early-morning) hours thanks to UCF's brand new OverKnight Study!

Read on below to find out when you can expect the library to be open on a semester basis and some holidays to look out for!

Orange Groves And Timber Stands: The Shaping Of Marjorie Kinnan Rawlings As Woman And Writer, Ginger Clark

The Marjorie Kinnan Rawlings Journal of Florida Literature

No abstract provided.

Press Release - 3rd Floor Opening 2023, Ucf Libraries

Libraries' Documents

Press release announcing the reopening of the 3rd floor of the John C. Hitt Library in 2023 after extensive renovations.

Diamond's Hidden Gems - Cmc, Diamond R. Williams

Libraries' Documents

You might recall that in a Spring 2023 Hidden Gems about study spaces, I briefly mentioned the CMC Library. My feelings about it, unsurprisingly, remain the same: it is truly one of the best-kept secrets at UCF.

And while it is still a nice place to relax and review schoolwork, there is a lot about it that I left out. Read on below to learn more about the CMC!

One Call At A Time: Offering Support To Bereaved Caregivers And Loved Ones, Joy Louis

High Impact Practices Student Showcase Fall 2023

Hospice care is an often overlooked and misunderstood part of the medical system, and one that I dove into firsthand for my Service-Learning project. As a telephone volunteer at VITAS Healthcare, one of the largest hospice care providers in the nation, I provided bereavement support for many family caregivers after their loved ones had passed away. This work allowed me to explore practices within the hospice industry and shed light on myths and misconceptions surrounding it. I was also able to see firsthand the impact of VITAS on the Central Florida community, as well as the vast positive impact resources …

Professional Development For Graduate School: Eportfolio And Networking, Wesley Lim

High Impact Practices Student Showcase Fall 2023

The development of an ePortfolio offers a digital introduction during networking events in an increasingly technology-driven society. Throughout one semester in Biomedical Sciences Careers, MCB 3933, I developed an ePortfolio with components like a resume, personal statement, individual development plan, and elevator speech. In my ePortfolio, I had three areas of focus that showcased my highlights and skills in my undergraduate education: the academic skill sets I developed, my relevant research experiences, and my time as a teaching assistant for multiple courses.

As part of the course, students were required to contact at least four people in their desired field …

Military & Veteran Student Success, Christopher Clark, Kate Rumisek, Anyelina Izzo, Sidrah Tufail, Vihan Yalamanchili

High Impact Practices Student Showcase Fall 2023

Our U-LEAD group collaborated with Mr. Michael Kepner, UCF’s Director of Military and Veteran’s Student Success (MVSS). The mission of the MVSS is to create an enriching and inclusive environment for military-affiliated students to achieve educational and career goals through academic success and community partnerships. In keeping with its mission, MVSS places miniature U.S. flags on campus every year since 2013. The number of flags on display corresponds to the military/veteran students attending UCF in Fall—1,400 flags were planted in 2022. This helps military-affiliated students through best practices, policies, and culture.

Project Nur: Illuminating Lives Through Islamic Society's Community Service In Central Florida, Adam Bawatneh

High Impact Practices Student Showcase Fall 2023

This poster presents an in-depth exploration of my service experience at the Islamic Society of Central Florida (ISCF), where I have been serving as the head chef for the Family Night event. It delves into the challenges and triumphs encountered during my service, particularly in light of the recent conflict in Palestine. The poster also reflects on the personal growth and leadership development I have experienced throughout this journey.

Addressing Women's Issues With Period. Ucf, Erin Fuchs

High Impact Practices Student Showcase Fall 2023

In my Advanced Leadership Class, LDR 3215, we were instructed to choose a social issue that we felt passionately about. Women’s rights issues have been a topic of interest for me for a very long time, so I chose to research and address the topic of period poverty, which is an overlooked subject, despite its prevalence in our society. In my research, I found some very interesting, but heartbreaking information that sparked me to work with an organization called Period. UCF, a local RSO that provides period products to the local homeless population and supports The Menstrual Movement, designed to …

Eportfolio Of Haley Galvis, Haley Galvis

High Impact Practices Student Showcase Fall 2023

This ePortfolio is aimed to help me be set apart from other applicants when pursuing my path following graduation. This unique method of showcasing my undergraduate experiences helps to generate a more personal view. Through this course, I made an elevator pitch, which can be found in the "about" page. Additionally, I learned a lot about time management, while balancing this major project with the other responsibilities of this course and my other commitments. Further, I learned how important it is to reflect on an experience and connect what I learned to how I can apply it in the future.

Special Needs Camporee, Lauren S. Barthel Ms.

High Impact Practices Student Showcase Fall 2023

The Special Needs Camporee is an event created to unite the community. This event specifically caters towards children with disabilities and their families. At this event we had numerous activities such as fishing, boat rides, games, traditional Indian dancing, and much more. I was the chairman of this event; therefore, I led the event with the help of others. Some of the tasks we had to accomplish to make sure this event was successful were recruiting volunteers and creating a program. We had to reach out to numerous organizations to ask for volunteers. We had over 300 plus volunteers. Regarding …

Optical Design Study Of A High-Resolution Spectrograph Utilizing Photonic Lanterns For A Large Fiber Array Telescope, Richard D'Alo

Graduate Thesis and Dissertation 2023-2024

Large area fiber array telescopes are a relatively modern development in the long history of telescope design and effectively create a single large equivalent aperture by combining many smaller unit telescopes at a fraction of the cost. In this study a spectrograph optical design is demonstrated that utilizes photonic lanterns in the input fiber feed for the Large Fiber Array Spectroscopic Telescope (LFAST) design concept, where photonic lanterns provide a simplified approach to the fiber feed originally proposed for LFAST. Conservation of etendue is applied to derive the relationship between slit size and photonic lantern ratio, and classical echelle spectrograph …

Utilizing Bloodless Medicine To Decrease Infection Rates In Hematopoietic Stem Cell Transplantation: A Literature Review, Samantha Saint Fort

Honors Undergraduate Theses

Aim: To determine if a significant relationship exists between bloodless medicine practices and decreased infection rates in oncology patients following hematopoietic stem cell transplantation by performing a literature review.

Background: It is not uncommon for healthcare professionals to encounter Jehovah's Witnesses (JW) seeking medical treatment in the acute care hospital setting and outpatient clinics alike. However, JW's pose a unique challenge to healthcare providers. Their refusal of blood transfusions makes them a population of interest within the medical community. The refusal of blood transfusions also poses a serious challenge to successful treatment in oncology JW patients, and many hospitals will …

Nursing-Related Interventions To Obstetric Violence: A Literature Review, Annaliece M. Balensiefen

Honors Undergraduate Theses

The aim of this literature search was to explore the prevalence of obstetric violence and identify nursing interventions that could potentially prevent the mistreatment of pregnant women in the United States healthcare system. Background: The topics of obstetric violence and healthcare disparities have been gaining awareness. Other countries have a larger body of research for obstetric violence compared to the U.S. Methods: CINAHL Plus with Full Text and MEDLINE databases were utilized. Global perspectives were considered in conjunction with the U.S. and specifically Florida. Healthcare disparities in obstetric care were identified, based on race, ethnicity, socioeconomic status, sexuality, disability, …

Post-Intensive Care Syndrome In Survivors Of Acute Respiratory Distress Syndrome (Ards) And Covid-19 Ards: A Descriptive Study, Sara Hassan

Honors Undergraduate Theses

Background: Post-intensive care syndrome (PICS) is an umbrella term for the long-term physical, cognitive, and mental health conditions survivors live with long after an ICU discharge. Mental health conditions experienced by survivors include anxiety, depression, and post-traumatic stress disorder (PTSD). Survivors of acute respiratory distress syndrome (ARDS) and COVID ARDS who were on a ventilator are particularly at risk of developing long-term mental health conditions.

Study Purpose: The purpose of this study was to investigate the severity of anxiety, depression, and PTSD in adult survivors of these two ARDS conditions (COVID ARDS; ARDS) who were admitted to intensive care units …