1,847 Works

Two Essays on Investor Attention, Investor Sentiment, and Earnings Pricing

Qiuye Cai
This dissertation proposes novel direct measures for both firm-level and market-level investor attention and investor sentiment and provides new empirical evidence on the effects of investor attention and investor sentiment on earnings pricing. The first essay proposes novel direct measures for both market-level and firm-level attention using user activity data from StockTwits.com. To the best of my knowledge, this is the first direct measure of market-level attention. By measuring market-level and firm-level attention separately, I...

The Effect of Task Interruptions and Reliable Cues on Detection Changes Within Dynamic Scenes

Kimberly N. Perry
Interruptions are a common problem for attention and pose a threat to visual task performance. The Memory for Goals (MFG) theory suggests that strongly and accurately encoded cues can assist the ability to resume a primary task after an interruption (Altmann & Trafton, 2002). Encoded cues can undergo an activation decay during an interruption and become forgotten. Currently, there has been limited research on how visual interruptions affect cued recall within a dynamic environment. Thus,...

Communication Capability for a Simulation-Based Test and Evaluation Framework for Autonomous Systems

Ntiana Sakioti
The design and testing process for collaborative autonomous systems can be extremely complex and time-consuming, so it is advantageous to begin testing early in the design. A Test & Evaluation (T&E) Framework was previously developed to enable the testing of autonomous software at various levels of mixed reality. The Framework assumes a modular approach to autonomous software development, which introduces the possibility that components are not in the same stage of development. The T&E Framework...

Estimation of Correlation Confidence Intervals via the Bootstrap: Non-Normal Distributions

John Mart V. DelosReyes
Estimating confidence intervals (CIs) for the correlation has been a challenge. The challenge stems from the metamorphic nature of the sampling distribution of the correlation being bound by-1≤ρ≤1. The nonparametric nature of the bootstrap makes it a good option for estimating correlation CIs. However, there have been mixed results about the robustness of bootstrap CIs for the correlation with non normal data. This had led the literature to suggesting the use of transformation methods to...

From Compassion to Resistance: Lesbos Refugee Crisis

Luz Diaz
“What would I do if I wasn’t given freedom? I would protest every day.” This illustrates the empathy that locals in Lesbos shared with the struggles of refugees when the European Refugee Crisis arrived on the shores of Lesbos in 2015. Locals on the island helped refugees get off boats—or saved them from the water—and offered to take them to the city center to claim asylum. But soon, with the arrival of humanitarian aid organizations,...

Computational Analysis of Antipode Algorithms for the Output Feedback Hopf Algebra

Lance Berlin
The feedback interconnection of two systems written in terms of Chen-Fliess series can be described explicitly in terms of the antipode of the output feedback Hopf algebra. At present, there are three known computational approaches to calculating this antipode: the left coproduct method, the right coproduct method, and the derivation method. Each of these algorithms is defined recursively, and thus becomes computationally expensive quite quickly. This motivates the need for a more complete understanding of...

Challenges of Designing and Operating a Pilot Scale Short Residence Time Continuous Hydrothermal Flash Hydrolysis Reactor for High Slurry Load Biomass Processing

Mason James Martin
Increasing demand for renewable energy, fuels, and bioproducts has resulted in a push for increasingly efficient and economically favorable biomass pretreatment methods. Flash Hydrolysis, (FH) a promising biomass pretreatment method, has been extensively studied at a laboratory scale. FH employs a continuous subcritical hydrothermal process capable of fractionating microalgae for lipid and protein recovery. FH is unique in that the residence time is very short (~ 10 s). Maintaining this residence time was key in...

I Had to Do the Reading: A Phenomenological Case Study of College English Students

Jennifer Eleanor Frank
The purposes of this qualitative phenomenological case study were to investigate multiple student experiences in a general elective introduction to literature course when music was added as an autonomously structured assignment. Music and song lyrics are no strangers to the classroom setting, but there is a gap in the literature examining the space where students can create meaningful links between music they enjoy and assigned course readings in college English. Informed by social constructivism and...

The Effect of Noncognitive Variables on the Prediction of Academic Difficulty and Attrition of Freshman Student-Athletes

Bruce W. Cunningham
This study identified a set of noncognitive variables, indicators of attitudes, habits, and beliefs as they relate to an individual's educational pursuits, in the form of Probation and Attrition Scores, to be used as alternatives to the exclusive use of cognitive variables to identify freshman student-athletes who are at risk of academic difficulty or attrition. Data were collected at an urban, public university of approximately 17,000 students using the University's Freshman Survey, an instrument that...

The Effect of Same-Sex Grouping Versus Mixed-Sex Grouping on Mathematics Achievement and Attitudes of Academically Gifted Fourth and Fifth Grade Females in the Urban Classroom

Martha J. Tompkins
Reports of the neglect of gifted students in America's schools and the inadequate mathematics involvement of females have made educators aware of a crisis in public education. Attitudes and opportunities are believed to be major influences in helping females become more involved with mathematics courses and careers. The research project examined the effect of same-sex groups versus mixed-sex groups on mathematics attitudes and achievement in fourth and fifth grade females in a mathematically gifted pilot...

Geochemical Behavior of the Rare Earth Elements in Natural Terrestrial Waters

Jianwu Tang
This dissertation presents three manuscripts describing the following aspects of the geochemical behavior of REEs: (1) solution complexation of REEs with both inorganic and organic ligands in natural terrestrial waters; (2) the geochemical behavior of REEs along the groundwater flow paths in two different aquifer types (i.e., sand vs. carbonate); and (3) surface complexation behavior of REEs in the Carrizo Sand aquifer. In the first manuscript, a solution complexation model of REEs, which includes both...

Examining the Community and Two-Year Technical College Presidency: Vice President and Chief Officer Perceptions of Challenges, Changes, and Aspirations

Juliet Jefferson Brown
Since 2001, community and two-year technical college presidents have been aware of the impending leadership crisis. Retirements, ill-prepared successors, and lack of credentialed candidates in the administrative pipeline will create what many believe to be a "leadership crisis." This workforce shortage is coupled with the sentiment that the role of the community college president has changed over the last decade. The purpose of this research study was to provide a demographic profile of potential candidates...

The Effect of Standardised Learning Diaries on Self-Regulated Learning, Calibration Accuracy and Academic Achievement

Avanelle Joseph-Edwards
The online learning environment is a dynamic yet complex learning modality. Students are physically separated from their peers, they grapple with feelings of isolation, and they may be unable to self-regulate their learning. Studies have shown that self-regulation is related to academic achievement and student metacognitive monitoring in online settings. The present study investigated the effects of a standardized diaries on students’ self-regulatory behaviors, calibration accuracy and academic achievement within an online learning environment. Using...

Crime and Panic: Contextual Factors in Violent and Sex Offender Sentencing

Jessica Huffman
Although crime rates have been decreasing nationwide, the public is still very concerned with crime as a social problem and generally supportive of criminal justice penalties for wrongdoing. The mass of punitive laws have been especially harsh on those convicted of sexual offenses, even as these offenders comprise a small part of the entire crime picture. The passage of mandatory minimum sentences and risk management laws for sex offenders suggest a moral panic over sexual...

The Impact of CETA Activities on Selected Hampton Roads Manpower Programs: Cost-Benefit Analysis and Utilization-Focused Evaluation

Raymond A. Gromelski
The study examined the effects of Classroom Training, On-the-Job Training, Work Experience, and JobShop programs of the Comprehensive Employment and Training Act (CETA) on the job opportunities, amount of government transfer payments, and criminal activities of the 1982 terminees. The purposes of the program were to determine (1) program cost-effectiveness; (2) which program components operate at higher levels of efficiency; and (3) which selected client characteristics influenced program results. The evaluation described program success in...

A Performance Prediction Model for a Fault-Tolerant Computer During Recovery and Restoration

Rodrigo A. Obando
The modeling and design of a fault-tolerant multiprocessor system is addressed in this dissertation. In particular, the behavior of the system during recovery and restoration after a fault has occurred is investigated. Given that a multicomputer system is designed using the Algorithm to Architecture To Mapping Model (ATAMM) model, and that a fault (death of a computing resource) occurs during its normal steady-state operation, a model is presented as a viable research tool for predicting...

Academic Engagement: The Impact of Personal, Cultural, and School Factors on African American Student Academic Effort

Ruth Alisha Jenkins Hill
Using the cultural-ecological and the personal perspective theory, this study examined the relationship of sociological and psychological factors on academic effort. This research used multiple linear regression analyses and data from the Educational Longitudinal Study of 2002 to examine the extent to which personal, cultural, and school structural variables predict academic effort among a sample of 10th grade African American students. African American students' personal perceptions characterizing their belief in the importance of education, their...

The Effects of Educational Programs About Rape on the Attitudes of First Year Urban University Students

Mary Jodine Wolford
This study investigated the effects of educational programs on first-year college students' attitudes toward rape. Subjects included 132 male and female (60 and 72, respectively) first-year students in an urban university who were selected randomly for participation. Each participant was assigned randomly to one of four treatment conditions: lecture-style programs, videotape programs, role play programs, or control. Data were collected in three phases: one pretest and two posttests. Attitudes toward rape were measured using the...

Marketing Higher Education to Mexican-Americans: Identification of Successful Marketing Strategies and Tactics

Cynthia Gale Coiner
In this study, a comprehensive set of successful marketing strategies and tactics for the recruitment of Mexican-Americans into four-year colleges and universities was identified. A taxonomy of findings ranging from very successful to not successful was developed. The methodology included focus groups conducted in Los Angeles, California and San Antonio, Texas to aid in the creation of survey instrument items. The resulting survey was mailed to admissions directors of four-year colleges and universities located in...

Computer Technology for Executive Decision-Making in Urban Public Education Divisions in Virginia

Richard Kenneth Byrd
The purpose of this study was twofold. First, the study determines if Virginia urban public school executive leadership used automated informational systems to support policy, goal setting, and decision making typical of its job requirements. Secondly, the study describes the planning techniques specific to automated system development used by the school division where such automated executive support occurs. The personal interview method was selected because it helps to insure 100 percent of the desired sample...

An Inquiry Into the Influence of Expressive Writing Practice on the Transactional Writing Abilities of Selected Fourth Grade Students

Maureen Elliott Hook
The study is an inquiry into the influence of expressive writing practice on the transactional writing abilities of selected fourth grade students. It is based on the ideas of James Britton, an English theoretician concerned with writing. The study was formulated to investigate how the process of writing occurs. Writing research is at an early stage, and this study will expand the knowledge of the field. The study consisted of a treatment group receiving intensive...

Salvation at the Cinema: Religious References in American Science Fiction Films of the 1980's

Marjorie Roberts Tautkus
This thesis examines several science fiction films from the 1980's for religious references, particularly in relation to the alien portrayed therein. E.T.: the Extra-Terrestrial presents the alien as good fairy, Christian savior, and son of the Great Goddess. Alien and Aliens give the demonic embodiment of human corruption. Star Trek refers to eastern mysticism, New Age religiosity, and Christianity, but the crew ultimately worships a machine, which itself recalls the Great Goddess. The Empire Strikes...

Medical Specialty Camps: A Holistic Approach to Assist in the Management Of Diabetes

Takeyra Monique Collins
From toddlers to adolescents, poor medical regimen and adherence occurs as youth face adversities caused by type 1 diabetes mellitus (T1DM). This inquiry-based research sought to explore the process of promoting resilience to attain personal diabetes management through outcome-focused programming. This dissertation was structured in a three-paper format to highlight three sectors of a medical specialty camp to identify the significance of building resilience among youth with T1DM, incorporating family support, and providing service-learning opportunities...

Single-Stage, Venturi-Driven Desalination System

Brandon Proetto
Water demand is increasing at a rapid pace due to population increase, industrial expansion, and agricultural development. The use of desalination technology to meet the high water demands has increased global online desalination capacity from 47 million m^3/d in 2007 to 92.5 million m^3/d as of June 2017 [49]. Membrane and thermal processes are the two mainstream desalination categories used worldwide for desalination plants. Reverse Osmosis (RO) is the most widely used membrane process and...

Nitrogen Dynamics of the Acacia Senegal Agroforestry System in the Sudan

Zakaria Abdalla Mohammed Saad
The savanna is characterized by low rainfall, poor soil and vegetation types dominated by the Genus Acacia. Agroforestry systems evolved, the most notable of which is Acacia senegal agroforestry system (ASAS). It yields gum acacia, fuel and fodder and improved soil N, P, and pH and stability against erosion. This study investigated the climatic, edaphic and biotic interactions of the ASAS that govern the nutrient dynamics, mainly N, and biomass. The effects of limited resources...

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