Digital Commons Network^™

Term Importance For Transformer-Based Qa Retrieval : A Case Study Of Stackexchange, Bryan Zhi Yang Tan, Hady W. Lauw

Research Collection School Of Computing and Information Systems

Question-answering (QA) retrieval is the task of retrieving the most relevant answer to a given question from a collection of answers. Various approaches to QA retrieval have been developed recently. One successful and popular model is Contextualized Late Interaction over BERT (ColBERT), a transformer-based approach that adopts a query-document scoring mechanism that retains the granularity of transformer matching, whilst improving on efficiency. However, one key limitation is that it requires further fine-tuning for new query or collection types. In this work, we explore and propose several non-parametric retrieval augmentation methods based on explicit signals of term importance that improve over …

Baffle : Hiding Backdoors In Offline Reinforcement Learning Datasets, Chen Gong, Zhou Yang, Yunpeng Bai, Junda He, Jieke Shi, Kecen Li, Arunesh Sinha, Bowen Xu, Xinwen Hou, David Lo, Tianhao Wang

Research Collection School Of Computing and Information Systems

Reinforcement learning (RL) makes an agent learn from trial-and-error experiences gathered during the interaction with the environment. Recently, offline RL has become a popular RL paradigm because it saves the interactions with environments. In offline RL, data providers share large pre-collected datasets, and others can train high-quality agents without interacting with the environments. This paradigm has demonstrated effectiveness in critical tasks like robot control, autonomous driving, etc. However, less attention is paid to investigating the security threats to the offline RL system. This paper focuses on backdoor attacks, where some perturbations are added to the data (observations) such that given …

Rule-Guided Counterfactual Explainable Recommendation, Yinwei Wei, Xiaoyang Qu, Xiang Wang, Yunshan Ma, Liqiang Nie, Tat‑Seng Chua

Research Collection School Of Computing and Information Systems

To empower the trust of current recommender systems, the counterfactual explanation (CE) method is adopted to generate the counterfactual instance for each input and take their changes causing the different outcomes as the explanation. Although promising results have been achieved by existing CE-based methods, we propose to generate the attribute-oriented counterfactual explanation. Different from them, we aim to generate the counterfactual instance by performing the intervention on the attributes, and then build an attribute-oriented counterfactual explainable recommender system. Considering the correlation and categorical values of attributes, how to efficiently generate the reliable counterfactual instances on the attributes challenges us. To …

Learning To Generate Explainable Stock Predictions Using Self‑Reflective Large Language Models, Kelvin J.L. Koa, Yunshan Ma, Ritchie Ng, Tat‑Seng Chua

Research Collection School Of Computing and Information Systems

Explaining stock predictions is generally a difficult task for traditional non-generative deep learning models, where explanations are limited to visualizing the attention weights on important texts. Today, Large Language Models (LLMs) present a solution to this problem, given their known capabilities to generate human-readable explanations for their decision-making process. However, the task of stock prediction remains challenging for LLMs, as it requires the ability to weigh the varying impacts of chaotic social texts on stock prices. The problem gets progressively harder with the introduction of the explanation component, which requires LLMs to explain verbally why certain factors are more important …

Astrocytes As A Mechanism For Contextually-Guided Network Dynamics And Function, Lulu Gong, Fabio Pasqualetti, Thomas Papouin, Shinung Ching

2020-Current year OA Pubs

Astrocytes are a ubiquitous and enigmatic type of non-neuronal cell and are found in the brain of all vertebrates. While traditionally viewed as being supportive of neurons, it is increasingly recognized that astrocytes play a more direct and active role in brain function and neural computation. On account of their sensitivity to a host of physiological covariates and ability to modulate neuronal activity and connectivity on slower time scales, astrocytes may be particularly well poised to modulate the dynamics of neural circuits in functionally salient ways. In the current paper, we seek to capture these features via actionable abstractions within …

Symptom Clusters In Individuals Seeking Treatment For Gambling Disorder, Blaine Stiglets

Electronic Theses and Dissertations

The fifth edition of the Diagnostic and Statistical Manual for Mental Disorders (DSM-5) presents the criteria for Gambling Disorder (GD) as a unidimensional construct where each additional symptom corresponds to increased severity. Many individuals experience addiction symptoms in specific symptom clusters, with membership to one profile of symptoms or other better-representing disorder severity than raw symptom counts. This study explored whether similarly informative symptom clusters exist among adults seeking treatment for gambling harms. The sample included 444 adults (Mage= 44.95) who completed an assessment of DSM criteria for GD at intake. Through a latent class analysis of GD criteria, three …

Do Emotion Dysregulation And Internalized Shame Mediate The Relationship Between Borderline Personality Disorder Symptomology And Criminal Involvement?, Madison Smith

Electronic Theses and Dissertations

Borderline personality disorder (BPD) is a severe and debilitating mental disorder that is over-represented within the criminal legal system (CLS), with 15-29.5% of individuals in the CLS meeting criteria. However, little research has examined mechanisms leading to criminal involvement within this population. Potential mechanisms include positive/negative emotion dysregulation and internalized shame, which (aside from positive emotion dysregulation) have been linked to criminal involvement in other populations. Research has yet to examine these constructs as mechanisms explaining criminal involvement among individuals with BPD. This study examined positive/negative emotion dysregulation and internalized shame as mechanisms of the relationship between BPD and criminal …

Exploring Knowledge And Perceptions Of Nursing Students: A Quantitative Study On Sexual Assault And Sex Trafficking Awareness, Isabella Marino

Electronic Theses and Dissertations

This study aims to explore nursing students' knowledge and perceptions of identifying and treating victims of sexual assault and sex trafficking. Survey data was collected from second to fifth semester nursing students in Eastern Tennessee. The study aims to identify students' perceptions of medical personnel's ability to identify and treat sexual assault and sex trafficking victims, examine whether adherence to myths affects knowledge and confidence levels, determine students' confidence in identifying and treating victims, and evaluate whether demographic characteristics affect identification and treatment. Results will help improve our approach towards these issues.

Conversion Of Microcrystalline Cellulose To Hexane Using Hydrogenated Metal Oxides At Low Temperature And Pressure, Mubarak Osman

Electronic Theses and Dissertations

Increasing global energy demand and environmental concerns have fueled the exploration of sustainable and efficient methods for renewable fuel production. The conversion of cellulosic waste to hydrocarbon fuels using hydrogenated metal oxides presents a novel and eco-friendly approach to sustainably address energy demand. In this study, hydrogenated metal oxides were used as catalysts in a relatively low-temperature and atmospheric-pressure environment to facilitate the conversion of cellulosic waste into hydrocarbon fuels. Hydrogenated metal oxides have been introduced as potential hydrogen transfer catalysts. The expected result is the selective conversion of cellulose to hexane at relatively low temperatures, which significantly reduces energy …

Electrochemiluminescence Using Pencil Graphite Electrodes And Screen-Printed Carbon Electrodes Interfaced With A Simple Imaging System, Sandra Ehigiator

Electronic Theses and Dissertations

Electrochemiluminescence (ECL) is a phenomenon whereby electrochemical reactions generate a product that is capable of emitting light. ECL’s high sensitivity, selectivity, extremely low background, and relatively simple instrumentation make it particularly well-suited for chemical sensing and biosensing strategies. Here we report a simple ECL imaging system based on a camera interfaced with a zoom lens to compare pencil graphite electrode (PGE) and screen-printed carbon electrode (SPCE) arrays as ECL platforms. With this system, ECL signals generated from tris(2,2′- bipyridine)ruthenium(II) chloride hexahydrate ([Ru(bpy)3]2+) using co-reactant tri-n-propylamine (TPA) were linear with respect to [Ru(bpy)3]2+ concentrations from 9 to 450 μM. Detection limits …

Comparative Analysis Of Surrogate Models For The Dissolution Of Spent Nuclear Fuel, Dayo Awe

Electronic Theses and Dissertations

This thesis presents a comparative analysis of surrogate models for the dissolution of spent nuclear fuel, with a focus on the use of deep learning techniques. The study explores the accuracy and efficiency of different machine learning methods in predicting the dissolution behavior of nuclear waste, and compares them to traditional modeling approaches. The results show that deep learning models can achieve high accuracy in predicting the dissolution rate, while also being computationally efficient. The study also discusses the potential applications of surrogate modeling in the field of nuclear waste management, including the optimization of waste disposal strategies and the …

The Experiences Of Questbridge Scholars At Elite Universities, Karla J. Leybold

Electronic Theses and Dissertations

In this dissertation, I examined the experiences of QuestBridge Scholars attending three different elite universities that enroll more students from the top income quintile than from the lowest three income quintiles combined. The universities attended by participants in this study are among the few that are both need-blind and that fully meet students’ demonstrated financial need through grant and scholarship aid. Additionally, these universities have acceptance rates of no more than 10%. The QuestBridge organization’s mission is to match high-achieving, low-income students with elite institutions.

Data from participants were collected through an audio and video recorded interview using a semi-structured …

P300 Event-Related Potential Responses To Self-Relevant Stimuli, Jordan Razzak

Electronic Theses and Dissertations

Previous literature has suggested an apparent P300 sensitivity to self-relevant stimuli. To further explore this relationship, we asked participants to submit 10 photos, each of a particular category (e.g. footwear, plants), to be used as either targets or distractors in a given condition of an oddball task. Furthermore, we attempted to see whether the effect of self-relevance on the P300 could be induced in a participant by allowing them to study a set of unique photos which would then be used as targets. Our analysis suggested that P300 amplitude elicited in response to self-relevant stimuli used as targets was statistically …

Preliminary Evidence For The Validity And Reliability Of A Modified Adverse Childhood Experiences (Aces) Scale: The Variability In Aces Scale, Mary Jo Hedrick

Electronic Theses and Dissertations

Adverse Childhood Experiences (ACEs) research has proliferated in the last twenty years with significant research demonstrating the detrimental effects of early childhood adversity. While many measures purport to measure ACEs, very few capture the intensity of ACEs while still calculating the traditional “ACEs tally.” Thus, it is the goal of this dissertation to collect evidence for an expanded ACES measure. The Variability in Adverse Childhood Experiences Scale (VACE) measure builds upon the original ACEs and captures interval level data. Two survey-based studies were conducted in which convergent and criterion related validity and test-retest reliability evidence were collected. In …

Reclamation: The Towns Of The Virginia Coalfields, Craig Owens

Electronic Theses and Dissertations

The photographer discusses his work in Reclamation: The Towns of the Virginia Coalfields, a Master of Fine Arts thesis exhibit held at the Tipton Gallery from February 12th through February 23, 2024. The exhibition focuses on coal towns located in the southwestern part of Virginia. The exhibition consists of 20 framed, archival inkjet prints. Each framed work is 36” x 24” and is representative of the artist’s exploration of the towns. A catalog of the exhibit is included at the end of this thesis.

Owens examines formal and conceptual artistic influences, both historical and contemporary. Historic and contemporary photographic …

Regulation Of Cd4 T Cell Functions By Ncrna-Mediated Signaling Pathways During Chronic Viral Infections, Lam Nguyen

Electronic Theses and Dissertations

CD4 T cell homeostasis and competency are critical for the effectiveness of antiviral immunity. However, CD4 T cells derived from people living with HIV (PLWH) and individuals with chronic HCV infection often exhibit an inflammaging phenotype, evidenced by persistent inflammation, immune activation, exhaustion, senescence, and cellular apoptosis. Despite intensive investigations, the molecular mechanisms underlying CD4 T cell dysfunction in antiretroviral therapy (ART)-controlled PLWH and HCV-infected patients remain poorly understood. By investigating the roles of non-coding (nc)RNA transcripts in regulating the functions of CD4 T cells derived from PLWH and HCV-infected patients, we demonstrated that long non-coding (lnc)RNA - growth arrest-specific …

Covid 19 And Classroom Instruction: A Comparison Of Synchronous In-Person And Virtual Student Learning, Jason Brown

Electronic Theses and Dissertations

The purpose of this ex-post facto quantitative study was to compare English Language Arts (ELA) and math Tennessee Compressive Assessment Program (TCAP) scores of students in grades four through eight who attended school virtually or in-person during the 2020-2021 school year. Due to the COVID-19 pandemic, the school district in this study allowed parents to choose to send their children to traditional in-person classes or attend school virtually. In-person and virtual students engaged synchronous classroom instruction through Google Meets. All virtual students were instructed by the teachers they would have had if their parents had chosen to send them for …

An Examination Of Early Childhood Leadership In Public Elementary Schools: A Mixed Methods Study, Wesam Alshahrani

Electronic Theses and Dissertations

As state-funded Pre-K programs in elementary schools continue to grow, elementary principals are increasingly responsible for supporting, supervising, and leading these programs. Therefore, examining elementary principals' early childhood leadership competencies and the factors influencing them may help understand and improve their experiences as early childhood education (ECE) leaders. This explanatory sequential mixed methods study examined the ECE leadership of Tennessee public elementary school principals in two phases.

In the quantitative phase, statewide surveys were used to collect data from 67 principals. The survey comprised 51 items assessing nine ECE leadership competencies, synthesized from statements of leading ECE and elementary education …

The Women’S Renaissance: An Analysis Of Gender Expectations And Experiences In Early Modern Europe, Taryn Shelnutt-Beam

Electronic Theses and Dissertations

In 1976 Joan Kelly released her influential article “Did Women have a Renaissance?” Kelly argued that women did not enjoy any of the benefits of the period. Rather, she claimed, the lives of women were actually worse after the 1400s than they had been before. Since 1976, new primary documents authored by women have been discovered. Moreover, new access to relevant writings by authors like Francesco Barbaro, Pier Vergerio, Leonardo Bruni, Juan Luis Vives, and Erasmus make revisiting Kelly’s arguments possible. This thesis uses a sample of these texts to explore women’s experiences and create innovative avenues to explore in …

A Comparison Of Student Academic Variables In Mixed Teaching Methods And Traditionally Taught Biology Courses At Participating Community Colleges In Tennessee, Elesha Goodfriend

Electronic Theses and Dissertations

The primary purpose of this study was to compare academic variables from students participating in mixed teaching methods/course revitalization biology courses to those in traditional courses at two community colleges in Tennessee. A two-group comparison design using archived data was used, which evaluated differences in final grades, exam scores, and homework completion as indicators of the academic success between an urban institution and a rural college. A power analysis was performed using G*Power software to provide the needed sample size, indicating a size of 176. There were 227 students in the active teaching lecture classrooms, and 198 students in the …

Interpreting Shift Encoders As State Space Models For Stationary Time Series, Patrick Donkoh

Electronic Theses and Dissertations

Time series analysis is a statistical technique used to analyze sequential data points collected or recorded over time. While traditional models such as autoregressive models and moving average models have performed sufficiently for time series analysis, the advent of artificial neural networks has provided models that have suggested improved performance. In this research, we provide a custom neural network; a shift encoder that can capture the intricate temporal patterns of time series data. We then compare the sparse matrix of the shift encoder to the parameters of the autoregressive model and observe the similarities. We further explore how we can …

Descriptions Of Interglacial Mastodons From Snowmass, Colorado, Connor White

Electronic Theses and Dissertations

The Ziegler Reservoir fossil site (ZRFS) in Colorado contains over 4000 mastodon bones that date from 140,000 to 100,000 years ago. At an elevation of ~2705 meters above sea level, ZRFS represents an alpine ecosystem dated to Marine Isotope Stage (MIS) 5. Formal descriptions of cheek teeth, mandibles, crania, and femora were completed. Statistical analyses of the upper and lower third molars, including a novel measurement of interloph(id) distances, indicate significant differences between ZRFS mastodons and Mammut pacificus, while falling within the ranges for Mammut americanum. This study agrees with the taxonomic assignment of ZRFS mastodons to Mammut …

Groundswell, Ursula Gullow

Electronic Theses and Dissertations

The artist discusses the artwork of her Master of Fine Arts exhibition, Groundswell, held at Tipton Gallery in Johnson City, March 11 – 22, 2024. The exhibition includes wall pieces, sculpture, plaster, and ceramic objects that explore the traditional parameters of painting and its presentation.

Ideas discussed include the philosophy of history, and the origin of European art tropes such as odalisques, flowers, and birds. Framing devices, deconstructed paintings, fiber arts, ceramics, 18^th Century decorative art, plaster, the studio practice, Walter Benjamin, David Lowenthal, Gustave Courbet, Jean Honoré Fragonard, Titus Kaphar, Valerie Hegarty, and maximalism are also surveyed.

Exploring The Correlates And Predictors Of Covid-19 Vaccine Hesitancy And Uptake Among People Living With Hiv/Aids In Tennessee, Charles Olomofe

Electronic Theses and Dissertations

Background

The administration of the COVID-19 vaccines has met with resistance and hesitance from different population groups including people living with HIV/AIDS (PLWHA). It is concerning to know that PLWHAs are showing a higher rate of COVID-19 vaccine hesitancy than the general population. The objective of this study is to synthesize the literature and determine the correlates and predictors of COVID-19 vaccine hesitancy among PLWHA using primary and secondary data.

Methods

A scoping review was conducted to identify and summarize studies on COVID-19 vaccine hesitancy among PLWHA using the Preferred Reporting Items for Systematic Review and Meta-analysis (PRISMA) Extension for …

An Environmental Struggle: Nature’S Role In The Poetry Of Seamus Heaney And Robert Frost, Jake Lawson

Electronic Theses and Dissertations

Both New England’s Robert Frost and Northern Ireland’s Seamus Heaney are considered major poets of the 20^th century. Both poets present speakers who rely upon rural settings to explore troublesome feelings and difficult experiences. Their speakers project their human experience onto nature, but because nature is indifferent, they cannot find solutions for their personal discomfort and uncertainties. By examining the writers in this order—Ralph Waldo Emerson, Mary Oliver, Seamus Heaney, and Robert Frost—a spectrum concerning the poet and their relationship to nature emerges. By considering John Ruskin’s pathetic fallacy, we will see a movement from irrationality in transcendental depictions, …

From Silence To Interpretation: West Lawn Cemetery In Johnson, Tennessee And The Case For Cemeteries As Public History Sites, Julia Underkoffler

Electronic Theses and Dissertations

The preservation needs and historical significance located within West Lawn Cemetery in Johnson City, Tennessee, a historically African American Cemetery, show the potential cemeteries have as an impactful public history site. Similar to sites like historic houses, museums, and battlefields; cemeteries offer another insight into the past through interpretation and preservation. A cemetery's ethical and practical uses as a public history site can pose complex challenges. This thesis aims to provide a compelling argument for cemeteries as repositories of irreplaceable history, providing a space for their spot in the field of public history. Although little scholarly literature is given on …

Influence Of Medication Assisted Treatment Weaning On Neonatal Abstinence Syndrome And Outcomes Among Infants Born To Women With Opioid Use Disorder, Rakesh Adelli

Electronic Theses and Dissertations

Neonatal abstinence syndrome (NAS) is a drug withdrawal syndrome exhibited by infants born to mothers with opioid use disorder (OUD). The American College of Obstetricians and Gynecologists and other professional societies endorse opioid agonist pharmacotherapy (MATs) as the optimal treatment for OUD during pregnancy. This study focuses on impact of weaning of MAT drugs on the incidence of NAS and neonatal birth outcomes among babies born to women with opioid exposure.

The study population included eighty-six pregnant women with OUD, divided in to weaning and non-weaning groups based on their choice to wean the MATs during pregnancy. Univariate analysis was …

Design And Validation Of A Test For Teachers: Measuring Knowledge Of Trauma, Jennifer B. Bilbrey

Electronic Theses and Dissertations

Research and interest in trauma-informed pedagogy have grown substantially. Trauma-informed pedagogy includes knowledge of trauma symptoms, associated behaviors, and environmental and instructional trauma-informed strategies. Various scales measure attitudes and experiences with trauma-informed practices; however, the literature suggests a lack of validated tests measuring teachers' knowledge of trauma. Reliable and valid tests measuring knowledge are critical when determining the professional development needs of both pre-service and in-service teachers. This multi-phase study aimed to fulfill this need by creating the Teachers’ Knowledge of Trauma (TKOT) test. With the guidance of literature and qualitative data from eight early childhood professional peers, a 50-item …

The Association Between Prenatal Care And Postpartum Depression: Current State And Future Directions, Esther Adebayo-Abikoye

Electronic Theses and Dissertations

Background

Postpartum depression (PPD) is a major public health challenge and associated with poor maternal and infant health outcomes. Quality prenatal care decreases adverse outcomes in pregnancy and may reduce PPD risk factors. This study critically reviews the evidence about the role of prenatal care practices in reducing PPD prevalence across population groups and examines the association between prenatal care timing and counseling content with PPD prevalence.

Methods

A scoping review was completed across eight databases to synthesize evidence about prenatal care and PPD across different contextual settings. National data from the Pregnancy Risk Assessment Monitoring System (PRAMS) was used …

Establishing “The Fossil Record”: A Database Of Vertebrate Paleontological Sites Across The State Of Tennessee, Sarah Mclaurine

Electronic Theses and Dissertations

Fossil localities across the state of Tennessee and the data related to those sites were compiled from Tennessee Division of Geology Bulletin 84, titled “Tennessee’s Prehistoric Vertebrates,” and stored in a Microsoft Access geodatabase housed by the Department of Collections at the East Tennessee State University Museum of Natural History located at the Gray Fossil Site. Included in the database are forms to enter new site localities, view information about those already entered, view and add data to a master faunal list for the state, view sites repository information and store and add documents that are key-word searchable from the …