Digital Commons Network^™

An Electromechanical Synchronization Of Driving Simulator And Adaptive Driving Aide For Training Persons With Disabilities, Rufael Berhane

USF Tampa Graduate Theses and Dissertations

Cars have become necessities of our daily life and are especially important to people with disability because they extend their range of activity and allow participation in a social life.

Sometimes driving a normal car is impossible for individuals with severe disability and they require additional driving aide. However, it is dangerous to send these individuals on the road without giving them special training on driving vehicles using an adaptive aide.

Nowadays there are a number of driving simulators that train disabled persons but none of them have joystick-enabled training that controls both steering, gas and break pedal. This necessitates …

Tumor Suppressive Effects Of The Beta-2 Adrenergic Receptor And The Small Gtpase Rhob, Adam E. Carie

USF Tampa Graduate Theses and Dissertations

Receptor tyrosine kinases such as ErbB2 contribute greatly to human malignant transformation, but the role that other receptors such as ß2 adrenergic receptor (B2 AR)play in cancer is ill defined. Furthermore, while some GTPases such as Ras and RhoA promote oncogenesis, RhoB has been suggested to have tumor suppressive activity. In this thesis the tumor suppressive activity of ß2 adrenergic receptors through blockade of the Ras/Raf/Mek/Erk pathway is demonstrated. Furthermore, this thesis provides strong evidence in support of a tumor suppressive activity of RhoB, but not RhoA, in delaying EbB2 mammary oncogenesis in a transgenic mouse model.

Chapter 1 describes …

Analysis And Optimization Of Empirical Path Loss Models And Shadowing Effects For The Tampa Bay Area In The 2.6 Ghz Band, Julio C. Costa

USF Tampa Graduate Theses and Dissertations

This thesis analyzes the wireless propagation modeling of a 2.6 GHz band channel around the Tampa Bay area. Different empirical models are compared against measured data, and an adapted model, specific for the Tampa Bay area, is presented that builds on the accuracy of existing models. The effects of the propagation characteristics along bridges are also discussed, and a two-slope model is presented. The proposed models are based on a simple linear regression method, and statistical tests are evaluated for reliability thereof. The analysis also investigates the statistical properties of shadowing effects imposed on the wireless channel. The spatial correlation …

An Approach To Designing An Unmanned Helicopter Autopilot Using Genetic Algorithms And Simulated Annealing, Namir Aldawoodi

USF Tampa Graduate Theses and Dissertations

This dissertation investigates the application of Genetic Algorithms (GA) and Simulated Annealing (SA) based search techniques to the problem of deriving an auto-pilot that can emulate a human operator or other controller flying a Small unmanned Helicopter (SH). A Helicopter is a type of Vertical Take Off and Landing Vehicle (VTOL). The maneuvers are none aggressive, mild maneuvers, that include u-turns, ascending spirals and other none extreme flight paths.

The pilot of the helicopter is a Fuzzy logic Controller (FC) pilot; it is assumed that the pilot executes the maneuvers with skill and precision. The FC pilot is given set- …

Secondary Pre-Service Teachers’ Knowledge And Confidence In Dealing With Students’ First Amendment Rights In The Classroom, Ian Call

USF Tampa Graduate Theses and Dissertations

Every year teachers find themselves involved in conflicts dealing with violations of students' First Amendment rights to freedom of expression and freedom of religion. Students and parents file lawsuits against school districts because they feel teachers and administrators have violated their First Amendment rights. As a result, many teacher preparation programs require pre-service teachers to learn about educational law and the rights students have at school. Yet, little research exists about how well pre-service teachers are prepared to deal with First Amendment issues in the classroom.

The purpose of this study was to investigate how well pre-service teachers are prepared …

A Framework For Evaluating The Computational Aspects Of Mobile Phones, David Pedro Aguilar

USF Tampa Graduate Theses and Dissertations

With sales reaching $4.4 billion dollars in the first half of 2006 in the United States alone, and an estimated 80% of the world receiving coverage for their wireless phones in that year, interest in these devices as more than mere communicators has greatly increased. In the mid-to-late 1990s, digital cameras began to be incorporated into cellphones, followed shortly thereafter by Global Positioning System (GPS) hardware allowing location-based services to be offered to customers. Since then the use of mobile phone hardware for non-communication purposes has continued to expand. Some models, such as the Motorola V3M, have been specifically geared …

Computer-Based Instruction And Remedial Mathematics: A Study Of Student Retention At A Florida Community College, Carol A. Zavarella

USF Tampa Graduate Theses and Dissertations

Computer-based instruction including distance learning is fast becoming an integral part of higher education. Much of the current research has found that computer-based instruction is as effective as lecture-based instruction. Despite the wealth of studies that purport that students enrolled in computer-based instruction perform equally well as compared to their lecture-based counterparts, there is a high dropout rate associated with computer-based instruction including distance learning.

The purpose of this study was to examine the differences in students' withdrawal and completion rates in classes delivered via different instructional formats (distance learning, hybrid, or traditional) to determine if student learning style and/or …

The Association Between The Measles, Mumps, And Rubella Vaccine And The Development Of Autism: A Meta-Analysis, Rashad Carlton

USF Tampa Graduate Theses and Dissertations

Autism is a childhood developmental disorder characterized by impaired social interaction, difficulty with verbal and nonverbal communication and limited activities. The root cause of autism is unknown. However it has been postulated that administration of the measles, mumps, and rubella (MMR) vaccine may be causally related to the development of autism. MMR vaccination is a requirement for entry into schools, so any increase in adverse events associated with the vaccine carries widespread public health importance.

The primary objective of this study was to conduct a meta-analysis of the association between the MMR vaccination and the development of autism. The meta-analysis …

Discrete Event System Modeling Of Demand Responsive Transportation Systems Operating In Real Time, Daniel Y. Yankov

USF Tampa Graduate Theses and Dissertations

Demand responsive transportation is a variable route service of passengers or freight from specific origin(s) to destination(s) in response to the request of users. Operational planning of DRT system encompasses the methods to provide efficient service to the passengers and to the system operators. These methods cover the assignments of vehicles to transportation requests and vehicle routings under various constraints such as environmental conditions, traffic and service limitations. Advances in the information and communication technologies, such as the Internet, mobile communication devices, GIS, GPS, Intelligent Transportation Systems have led to a significantly complex and highly dynamical decision making environment. Recent …

Natriuretic Peptides As A Humoral Link Between The Heart And The Gastrointetsinal System, Anteneh Addisu

USF Tampa Graduate Theses and Dissertations

Natriuretic peptides are a family of hormones released by several different tissues and exert various physiological functions by coupling with cell surface receptors and increasing intracellular cyclic gyanylyl monophosphate (cGMP). Atrial Natriuretic Peptide (ANP) and B-type Natriuretic Peptide (BNP) are released in response to mechanical stretch of the atrial or ventricular myocardium, respectively and their plasma level is markedly elevated during myocardial infarction and heart failure. Heart failure in turn is associated with symptoms suggestive of perturbed gastrointestinal function such as nausea, indigestion and malabsorption.

Intragastric pressure was monitored using a balloon catheter in anesthetized mice. The pressure before and …

A Constant Struggle: Renegotiating Identity In The Aftermath Of Rape, Jo Aine Clarke

USF Tampa Graduate Theses and Dissertations

The academic study of rape has historically ignored the recovery experience of the person being raped. Beyond medical and physical effects, and the possibility of legal prosecution, little attention has been paid. Existing research loses sight of the survivor's experience, ignoring the fact that a rape affects every aspect of life. The trauma is not only physical, but also impinges on the emotional, intellectual and interpersonal spheres. Rape can be, and often is, a life-threatening experience: one that needs to be faced and dealt with before there can be any sort of productive future. While it has been demonstrated that …

Functional Remodeling Of The Cardiac Glycome Throughout The Developing Myocardium, Marty L. Montpetit

USF Tampa Graduate Theses and Dissertations

Cell surfaces are replete with complex, biologically important glycans responsible for multiple cellular functions including cell adhesion and cellular communication. Proper protein glycosylation is essential for normal development and often pathologies are marked by altered glycosylation. Here, data showed that the auxillary subunit, ß₁, modified voltage-gated Na⁺ channel (Na_v) gating in an isoform-specific, sialic acid dependent, and saturating manner. The regulated activity of the hundreds of glycogenes (glycosylation-associated genes) is responsible for protein glycosylation; this could result in a glycome of thousands of glycan structures. Microarray analyses indicated that glycogene expression was highly regulated throughout …

A Modified Obesity Proneness Model In The Prediction Of Weight Status Among High School Students, Joyce E. Nickelson

USF Tampa Graduate Theses and Dissertations

The health and well-being of U.S. children is challenged by the immense crisis of obesity. The obesity proneness model, first described by Costanzo and Woody (1985), describes one mechanism by which parents influence obesity development. This model suggests that parents become concerned about their children's weight if their children show signs of becoming overweight and parents value weight highly. Parents communicate their concerns to their children and restrict their children's eating. Children internalize parents' concerns and become unable to regulate their eating. Hence, parents socialize children to be concerned about their weight but do not equip them to regulate eating, …

The Interrelatedness Of Homosexual Identity Development And Perceptions Of Campus Climate For Gay, Lesbian, Bisexual, And Transgender Students At The University Of South Florida, Tampa Campus, Frederic Drury Baker

USF Tampa Graduate Theses and Dissertations

The purpose of this study was to determine the perceptions of campus climate at the University of South Florida, Tampa Campus for Gay, Lesbian, Bisexual, and Transgender students. Specifically, the study determined if there was any relationship between level of homosexual identity development acquired and perceptions of campus climate. If a relationship existed, it would influence the way that campus climate perceptions would be analyzed in future studies.

The population was the undergraduate student body at the University of South Florida taking at least six credit hours in the fall semester 2007. An online survey was created with two instruments …

Opportunities For Spiritual Awakening And Growth In Mothering, Melissa J. Albee

USF Tampa Graduate Theses and Dissertations

My experiences as a mother have been enhanced by spirituality and my spirituality has been transformed through the practice of mothering. I will argue that part of the transformation available in mothering is that one can go from thinking of oneself as an individual with free will, self autonomy, and independence to believing maybe we are all more connected and dependent upon each other than we thought. I intend to explore my personal spiritual journey from an academic perspective in order to gain and share knowledge. Intense emotional experiences such as childbirth, learning how to take care of a person …

Automatic Generation Of Plc Code Based On Net Condition Event Systems, Natalia Sandberg

USF Tampa Graduate Theses and Dissertations

An important consideration in discrete event dynamic systems control theory is the selection of a suitable modeling formalism that can capture the complex characteristics of the system and the capability to automatically synthesize a controller based on the system model. Net condition event systems are well suited for modeling complex discrete event dynamic systems owing to their input and output structure, which effectively captures the behavior of the physical devices to be monitored and/or controlled. To date, net condition event systems control models have not been extensively applied to highly automated manufacturing systems and there are few guidelines on how …

Development Of An Fpga Based Autopilot Hardware Platform For Research And Development Of Autonomous Systems, Wendy Alvis

USF Tampa Graduate Theses and Dissertations

Unmanned vehicles, both ground and aerial, have become prevalent in recent years. The research community has different needs than the industrial community when designing a finalized unmanned system since the vehicle, the sensors and the control design are dynamic and change frequently as new ideas are developed and implemented.

Current autopilot hardware, which is available as on-the-market products and proposed in research, is sufficient for unmanned systems design. However, this equipment falls short of being able to accommodate the needs of those in the research community who must be able to quickly implement new ideas on a flexible platform.

The …

A Potential Field Based Formation Control Methodology For Robot Swarms, Laura E. Barnes

USF Tampa Graduate Theses and Dissertations

A novel methodology is presented for organizing swarms of robots into a formation utilizing artificial potential fields generated from normal and sigmoid functions. These functions construct the surface which swarm members travel on, controlling the overall swarm geometry and the individual member spacing. Nonlinear limiting functions are defined to provide tighter swarm control by modifying and adjusting a set of control variables forcing the swarm to behave according to set constraints, formation and member spacing. The swarm function and limiting functions are combined to control swarm formation, orientation, and swarm movement as a whole. Parameters are chosen based on desired …

Altogether Governed By Humors: The Four Ancient Temperaments In Shakespeare, Caitlin Jeanne Fahey

USF Tampa Graduate Theses and Dissertations

Hippocrates, and later Galen, hypothesized that a person's character was influenced by a combination of four humors that governed the body: black bile, phlegm, yellow bile, and blood. Centuries later, the Elizabethans adopted these ideologies to their medical practices, and associated each humor with one of four temperaments: melancholy, phlegmatic, choleric, and sanguine. References to the four temperaments may be found embedded in a number of William Shakespeare's texts, most notably Hamlet, Henry IV, Part 1, Macbeth, and Twelfth Night. While many figures in Shakespeare embody many humoral traits, allowing for character development throughout the play, …

West Indian Parents’, Guardians’, And Caregivers’ Perceptions, Understandings, And Role Beliefs About K-12 Public Schooling In The United States, Susan Chanderbhan Forde

USF Tampa Graduate Theses and Dissertations

The purpose of this exploratory study was to examine the understandings and perceptions that West Indian parents and caregivers residing in the U.S. have about U.S. public schools. A second purpose of this study was to examine the consistency between these findings and the cultural-ecological theory advanced by Ogbu (1974) which posits that immigrant minorities to the U.S. hold different perceptions and expectations in relation to U.S. schools.

Using interviews with 13 families in the Tampa Bay area, the study examined West Indian parents' and caregivers' understanding of the American public schooling process, expectations for education, role beliefs, and roles …

Effects Of Electric Field On The Functions Of Cell Membrane Proteins, Zhongsheng Zhang

USF Tampa Graduate Theses and Dissertations

The most important and most common channels on cell membrane are voltage-gated Na+ and K+ channels. In so-called "excitable cells" like neurons and muscle cells, these channels open or close in response to changes in potential across the membrane in order to accomplish muscle contraction and transmit signals. By controlling the membrane potential, we observe extraordinary inactivation behaviors of the voltage-gated Na+ channels and the voltage-gated delayed rectifier K+ channels, which shows that electric stimulation pulses can temporarily close the Na+ and K+ channels, just as drugs, like tetrodotoxin (TTX) and tetraethylammonium (ETA), do.

The Na/K pump is essential for …

Idiom Comprehension In Bilingual And Monolingual Adolescents, Belinda Fusté-Herrmann

USF Tampa Graduate Theses and Dissertations

A majority of Latino adolescents are reading below a proficient level, according to federal data, and there is a significant gap between overall reading proficiency of Latino and non-Latino, Caucasian adolescents. The purpose of this study was to investigate the linguistic underpinnings of Latino students' text comprehension. A positive relationship appears to exist between idiom comprehension and academic achievement, as well as idiom comprehension and reading comprehension, in typically developing, monolingual adolescents. Since reading comprehension and idiom comprehension share many of the same linguistic processes, idiom comprehension may provide a unique perspective for investigating Latino adolescents' reading comprehension.

Using the …

Teacher Perceptions Of The Changing Role Of The Secondary Middle School Principal, Dawn E. Coffin

USF Tampa Graduate Theses and Dissertations

The focus of this study was to examine perceptions of middle school teachers regarding the changing role of the secondary middle school principal and compare teachers' results with assistant principals' and principals' perceptions of their role, thus adding the voice of teachers, regarding the secondary principal's role, to existing literature.

Data was collected electronically using the survey method in one urban Florida school district. Qualitative and quantitative data were captured using the Principal's Role Questionnaire (PRQ) (Goodwin, 2002). Thirty-six principal role descriptor statements on the PRQ survey requested a level of agreement from research participants regarding changes, current and future …

Designs And Applications Of Surface Acoustic Wave Sensors For Biological And Chemical Sensing And Sample Handling, Stefan Cular

USF Tampa Graduate Theses and Dissertations

Acoustic wave sensors have proven useful in many fields as primarily mass sensitive devices capable of responding to small environmental perturbations. The focus of this dissertation is the development of a new type of surface acoustic wave device with application to material property measurement, and biological and chemical sensing. This device is a combination of three independent acoustic wave devices with these waves propagated across the same area, while retaining independence of actuation and sensor function. The development of a complete sensor system, and its use and operation are presented for several example cases of chemical and biomarker sensing, and …

The Moderating Role Of Meaning And Defense Mechanisms In The Association Between Child Sexual Abuse And Romantic Relationship Dysfunction, Angela Fairweather

USF Tampa Graduate Theses and Dissertations

The current study investigated whether finding meaning in relation to sexual trauma and using mature defense mechanisms would moderate the association between child sexual abuse (CSA) severity and relationship and psychological adjustment in a sample of undergraduate women with a history of child sexual abuse. CSA severity was measured both objectively (i.e., severity of the abusive event) and subjectively (i.e., self-reported perceptions of the severity of the abusive event). As predicted, the interaction of objective CSA severity and mature defenses uniquely predicted one of four aspects of romantic relationship functioning (i.e., dyadic cohesion or doing joint activities with one's partner), …

The Influence Of Anxiety And Depression On Cognitive Functioning In Parkinson’S Disease, Lynn E. Oelke

USF Tampa Graduate Theses and Dissertations

Depression and anxiety are common psychiatric disturbances in Parkinson's disease (PD). Past studies have demonstrated a relationship between depression and cognitive decline in PD; however, the unique influence of anxiety has not been well studied. The objective of the present study was to differentiate the unique influences of depression and anxiety on cognitive functioning in PD. Sixty-eight cognitively intact PD patients with mild to moderate motor disease severity completed self-report questionnaires and neuropsychological tests. Two hierarchical regression analyses were conducted with executive functioning performance as the criterion variable, and two additional hierarchical regression analyses were conducted with memory performance as …

Role Of Protein Kinase C-Iota In Prostate Cancer, Hla Yee Win

USF Tampa Graduate Theses and Dissertations

Prostate cancer is one of the leading causes of death among males in the United States. In this study, we hypothesized that an activated PKC-iota-dependent anti-apoptotic pathway, drives the cell cycle proliferation and survival of prostate cancer cells.

We investigated the role of atypical PKC-iota (PKC-ι) in androgen- independent prostate DU-145 carcinoma, androgen-dependent prostate LNCaP carcinoma compared to transformed non-malignant prostate RWPE-1 cells. Western blotting and immunoprecipitations demonstrated that PKC-ι is associated with cyclin-dependent activating kinase (CAK/Cdk7) in androgen-dependent, RWPE-1 and LNCaP cells but not in androgen-independent DU-145 cells. Treatment of prostate RWPE-1 cells with PKC-ι silencing RNA (siRNA) decreased …

A Study Of Cross-Border Takeovers: Examining The Impact Of National Culture On Internalization Benefits, And The Implications Of Early Versus Late-Mover Status For Bidders And Their Rivals, Tanja Steigner

USF Tampa Graduate Theses and Dissertations

This dissertation consists of two self-contained chapters that empirically examine bidder firm returns of U.S. companies in cross-border mergers and acquisitions. In chapter one I examine how cultural distance between bidder and target country impacts internalization benefits. The results suggest that shareholders are initially concerned about the acquisition in culturally distant countries, which outweighs any potential benefits from internalization. However, in the long-run we observe a significant reversal of these findings. In the second and third year following the announcement, greater cultural distance positively impacts the bidder firm's operating performance and the bidder experiences significant internalization benefits from technological know-how …

Designing An Autonomous Helicopter Testbed: From Conception Through Implementation, Richard D. Garcia

USF Tampa Graduate Theses and Dissertations

Miniature Unmanned Aerial Vehicles (UAVs) are currently being researched for a wide range of tasks, including search and rescue, surveillance, reconnaissance, traffic monitoring, fire detection, pipe and electrical line inspection, and border patrol to name only a few of the application domains. Although small / miniature UAVs, including both Vertical Takeoff and Landing (VTOL) vehicles and small helicopters, have shown great potential in both civilian and military domains, including research and development, integration, prototyping, and field testing, these unmanned systems / vehicles are limited to only a handful of university labs. For VTOL type aircraft the number is less than …

Re-Islamization In Higher Education From Above And Below: The University Of South Florida And Its Global Contexts, Terri K. Wonder

USF Tampa Graduate Theses and Dissertations

This study explores Islamism's interplay with higher education as the movement advances an agenda for worldwide reformation. Over an eighty-year period, Islamism has appropriated higher education institutions, professional associations, on- and off-campus organizations, and publications as a primary means to achieve its utopian objective of the Nizam Islami, or "Islamic Order." Findings show how the Muslim Brotherhood in Egypt developed a Weberian bureaucratic organizational and administrative structure to exert influence not only in Egypt but also the world. A Qutb-inspired "hijra" of Muslim Brothers in universities proved itself adroit at filling macro-and micro-level policy vacuums in Soviet-aligned post-colonial societies, marginalizing …