Digital Commons Network^™

Incorporating Complexities Into The Explanation Of Decision Making: Strategy Simulations And An Empirical Test, Nathaniel Decker

USF Tampa Graduate Theses and Dissertations

This investigation of risky decision making models the standard forced-choice two outcome lottery task by incorporating elements of complexity present in real-world decision making. Potential decision criteria such as current wealth and quality of life information were made available to examine the influence of time-dependent contextual cues on decision strategy selection, since previous investigations of decision making have not included specific contextual cues that would allow for people to use complex or "dynamic" decision strategies.

Two studies explored simulated decision strategies requiring more or less complexity. Results suggest that strategies using dynamic, time-dependent criteria provide important advantages over simpler strategies. …

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 …

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 …

Dynamic Programming With Multiple Candidates And Its Applications To Sign Language And Hand Gesture Recognition, Ruiduo Yang

USF Tampa Graduate Theses and Dissertations

Dynamic programming has been widely used to solve various kinds of optimization problems.In this work, we show that two crucial problems in video-based sign language and gesture recognition systems can be attacked by dynamic programming with additional multiple observations. The first problem occurs at the higher (sentence) level. Movement epenthesis [1] (me), i.e., the necessary but meaningless movement between signs, can result in difficulties in modeling and scalability as the number of signs increases. The second problem occurs at the lower (feature) level. Ambiguity of hand detection and occlusion will propagate errors to the higher level. We construct a novel …

Schools As Moderators Of Neighborhood Influences On Adolescent Academic Achievement And Risk Of Obesity: A Cross-Classified Multilevel Investigation, Bethany A. Bell-Ellison

USF Tampa Graduate Theses and Dissertations

Grounded in Bronfenbrenner's (1979) Ecological Systems Theory and through the application of cross-classified random effects models, the goal of this study was to examine simultaneously neighborhood and school influences on adolescent academic achievement and risk of obesity, as well as the moderating effects of schools on these outcomes. By examining concurrently neighborhood and school influences on achievement and risk of obesity, this study aimed to fill gaps in the social determinants literature. For example, it is unclear if where an adolescent lives or where she/he attends school has a stronger influence on academic achievement. We also do not know if …

Safety Evaluation Of Freeway Exit Ramps, Hongyun Chen

USF Tampa Graduate Theses and Dissertations

The primary objective of the study is to evaluate safety performances of different exit ramps used in Florida and nationally. More specific, the research objectives include the following two parts: (1) to evaluate the impacts of different exit ramp types on safety performance for freeway diverge areas; and (2) to identify the different factors contributing to the crashes happening on the exit ramp sections. To achieve the research objectives, the research team investigated crash history at 424 sites throughout Florida. The study area includes two parts, the freeway diverge area and the exit ramp sections. For the freeway diverge areas, …

The Geriatric Cancer Experience In End Of Life: Model Adaptation And Testing, Harleah G. Buck

USF Tampa Graduate Theses and Dissertations

The National Institutes of Health recommends the development of conceptual models to increase rigor and improve evaluation in research. Validated models are essential to guide conceptualizations of phenomena, selection of variables and development of testable hypotheses. Structural equation modeling (SEM) is a methodology useful in model testing due to its ability to account for measurement error and test latent variables. The purpose of this study was to test a model of The Geriatric Cancer Experience in End of Life as adapted from Emanuel and Emanuel's framework for a good death using SEM. It was hypothesized that the model was a …

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 …

Application Of An Improved Transition Probability Matrix Based Crack Rating Prediction Methodology In Florida’S Highway Network, Sahand Nasseri

USF Tampa Graduate Theses and Dissertations

With the growing need to maintain roadway systems for provision of safety and comfort for travelers, network level decision-making becomes more vital than ever. In order to keep pace with this fast evolving trend, highway authorities must maintain extremely effective databases to keep track of their highway maintenance needs. Florida Department of Transportation (FDOT), as a leader in transportation innovations in the U.S., maintains Pavement Condition Survey (PCS) database of cracking, rutting, and ride information that are updated annually.

Crack rating is an important parameter used by FDOT for making maintenance decisions and budget appropriation. By establishing a crack rating …

Do Dibels Nonsense Word Fluency Scores Predict Sat-10 Reading Scores In First Grade? A Comparison Of Boys And Girls In Reading First Schools, Diane E. Napier

USF Tampa Graduate Theses and Dissertations

The purpose of this study was to examine the efficacy of DIBELS Nonsense Word Fluency Scores in the fall of first grade as a predictor of SAT-10 results. A comparison of boys and girls, three ethnic groups (Caucasian, Hispanic, African-American), and three different reading risk groups were examined using multiple regression analyses. Analysis of data from a total of 27,000 participants from a cohort of Reading First schools in 2003/2004 confirmed Nonsense Word Fluency scores in the fall of first grade to be a significant predictor of the SAT-10 reading scores in the spring. Differences found between and within groups …

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 …

Analysis Of Glycerol 3-Phosphate Dehydrogenase And Sarco/Endoplasmic Reticulum Calcium Ion Channel Atpase For Use In Deep Metazoan Phylogenetics, Terry G. Campbell

USF Tampa Graduate Theses and Dissertations

Genetic sequence data have been widely used to analyze metazoan phylogenies for two decades, and numerous datasets have been generated for testing relationships at many different taxonomic levels. The rapid divergence of major metazoan body plans during the Cambrian explosion confounds the determination of phylogenetic relationships among metazoan phyla. Few molecular analyses at this level have used both multiple genes and broad taxonomic representation. Furthermore, most studies have relied exclusively on the small ribosomal subunit rRNA gene (SSU). Many of the other genes that have been examined have possessed substitution rates that are inappropriate for resolving the relationships among metazoan …

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 …

Transducer Dynamics, Egor Dolzhenko

USF Tampa Graduate Theses and Dissertations

Transducers are finite state automata with an output. In this thesis, we attempt to classify sequences that can be constructed by iteratively applying a transducer to a given word. We begin exploring this problem by considering sequences of words that can be produced by iterative application of a transducer to a given input word, i.e., identifying sequences of words of the form w, t(w), t²(w), . . . We call such sequences transducer recognizable. Also we introduce the notion of "recognition of a sequence in context", which captures the possibility of concatenating prefix and suffix words to each word in …

Subconstituent Algebras Of Latin Squares, Ibtisam Daqqa

USF Tampa Graduate Theses and Dissertations

Let n be a positive integer. A Latin square of order n is an n×n array L such that each element of some n-set occurs in each row and in each column of L exactly once. It is well-known that one may construct a 4-class association scheme on the positions of a Latin square, where the relations are the identity, being in the same row, being in the same column, having the same entry, and everything else. We describe the subconstituent (Terwilliger) algebras of such an association scheme. One also may construct several strongly regular graphs on the positions …

Born And Bred: The Making Of A 21st Century College-Bred African American: A Re-Examination Of Atlanta University’S 1910 Study “The College-Bred Negro American” Edited By W.E.B. Du Bois, Ph.D And Augustus Granville Dill, A.M., Michael E. Carter

USF Tampa Graduate Theses and Dissertations

In 1910 Atlanta University published the findings of an extensive study of universities in the United States which Negroes attended. For this, study both quantitative and qualitative data was collected. The quantitative data was derived from the school catalogs and information provided directly from the Negro colleges (Du Bois & Dill, 1910). Data was collected on student enrollment, courses of study selected by the students and degrees conferred. The qualitative data was derived from survey information provided by 800 Negro, college graduates¹. In addition to basic statistical information respondents were asked to provide information on their hopes, aspirations and expectations …

Equilibrium Bidding In Joint Transmission And Energy Markets, Cihan Babayigit

USF Tampa Graduate Theses and Dissertations

Participants in deregulated electric power markets compete for financial transmission rights (FTRs) to hedge against losses due to transmission congestion by submitting bids to the independent system operator (ISO). The ISO obtains an FTR allocation, that maximizes sales revenue while satisfying simultaneous feasibility. This FTR allocation remains in place for a length of time during which the participants compete in the energy market to maximize their total payoff from both FTR and energy markets. Energy markets (bi-lateral, day ahead, real time) continue until the the end of the current FTR period, at which time the participants can choose to modify …

Nano Scale Based Model Development For Mems To Nems Migration, Andres Lombo Carrasquilla

USF Tampa Graduate Theses and Dissertations

A novel integrated modeling methodology for NEMS is presented. Nano scale device models include typical effects found, at this scale, in various domains. The methodology facilitates the insertion of quantum corrections to nanoscale device models when they are simulated within multi-domain environments, as is performed in the MEMS industry. This methodology includes domain-oriented approximations from ab-initio modeling. In addition, the methodology includes the selection of quantum mechanical compact models that can be integrated with basic electronic circuits or non-electronic lumped element models.

Nanoelectronic device modeling integration in mixed signal systems is reported. The modeling results are compatible with standard hardware …

Design And Modeling Of A Bistable Spherical Compliant Micromechanism, Joseph Georges Choueifati

USF Tampa Graduate Theses and Dissertations

Compliant bistable mechanisms are mechanisms that have two stable equilibrium positions within their range of motion. Their bistability is mainly due to the elasticity of their members. This thesis introduces a new type of bistable micromechanisms, the Bistable, Spherical, Compliant, four-bar Micromechanism (BSCM). Theory to predict bistable positions and configurations is also developed. Bistabilty was demonstrated through testing done on micro-prototypes. Compared to the mathematical model of the BSCM, Finite element models of the BSCM indicated important qualitative differences in the mechanism's stability behavior and its input-angle-input torque relation. The BSCM has many valuable features, such as: Two stable positions …

Examining Physicians’ Motivations To Volunteer: An Applied Visual Anthropological Approach, Jess Paul Ambiee

USF Tampa Graduate Theses and Dissertations

In the U.S., the number of persons who cannot afford health care continues to rise. Providing a "safety net" for such persons is becoming increasingly important. Medical professional volunteerism provides access to health care for people who have little or no access to health care otherwise.

At a not-for-profit free health clinic in Tampa, Florida, hundreds of physicians have volunteered their time in an attempt to reduce the health care gap in their community. The clinic sees thousands of persons who have very limited options in regards to their health care. This study investigates the reasons physicians volunteer and the …

Processing And Characterization Of Zinc Oxide Thin Films, Michael Depaz

USF Tampa Graduate Theses and Dissertations

Zinc oxide is a very versatile material that can be used in many microsystems and MEMS applications. ZnO thin film has been utilized in a wide variety of MEMS devices because of its unique piezoelectric, optical, and electrical properties. In particular, piezoelectric property of ZnO can be used in numerous applications from resonators and filters to mass sensors and micro-actuators (e.g., micro-valve and micro-pump). Because of its versatility, this research was focused on analyzing some key properties of ZnO thin film achieved by two different deposition techniques, Pulsed Laser Deposition (PLD) and Sputtering. Multiple experiments were conducted in order to …

Integrin Mediated Mechanotransduction In Renal Vascular Smooth Muscle Cells, Lavanya Balasubramanian

USF Tampa Graduate Theses and Dissertations

Integrins are transmembrane heterodimeric proteins that link extracellular matrix (ECM) to cytoskeleton and have been shown to function as mechanotransducers in non-muscle cells. Synthetic integrin-binding peptide triggers Ca²⁺ mobilization and contraction in vascular smooth muscle cells (VSMCs) from rat afferent arteriole, indicating that interactions between ECM and integrins modulate vascular tone. RGD, an integrin binding peptide, triggered contraction in cultured VSMCs as observed by Electric Cell-Substrate Impedance Sensing technique. To examine whether integrins transduce extracellular mechanical stress into intracellular Ca²⁺ signaling events in VSMCs, unidirectional mechanical force was applied to freshly isolated renal VSMCs through paramagnetic beads coated …

Acoustic Classification Of Benthic Habitats In Tampa Bay, Shane C. Dunn

USF Tampa Graduate Theses and Dissertations

The need for assessment of benthic habitat characteristics may arise for many reasons. Such reasons may include but are not limited to, habitat mapping, environmental concerns and identification of submerged aquatic vegetation. Oftentimes, such endeavors employ the use of aerial photography, satellite imagery, diving transects and extensive sampling. Aerial photography and remote sensing techniques can be severely limited by water clarity and depth, whereas diver transects and extensive sampling can be time consuming and limited in spatial extent. Acoustic methods of seabed mapping, such as the acoustic sediment classification system QTC are not hampered by water clarity issues. The acoustic …

Malaria, Labor Supply, And Schooling In Sub-Saharan Africa, Taiwo Abimbola

USF Tampa Graduate Theses and Dissertations

The purpose of this study is to evaluate the causal effects of malaria and poor health in general on economic outcome in Sub-Saharan Africa. This study uses panel data from the Living Standard Measurement Survey (LSMS) for Tanzania from 1991 to 2004. Three main hypotheses are tested. First, the study evaluates the effect of malaria and other chronic illnesses on labor supply using the number of hours worked per week as a measure of outcome. Second, it determines the impact of poor health on human capital accumulation by measuring the number of weekly school hours lost to illness. The third …

Development Of Micro/Nanosensor Elements And Packaging Techniques For Oceanography, Shyam Aravamudhan

USF Tampa Graduate Theses and Dissertations

In this research, novel high resolution reinforced diaphragm MEMS piezoresistive pressure sensors were designed, fabricated and tested to measure physical phenomena (such as depth/pressure variations) in the ocean. To complement the physical sensing elements, a microfluidic electrochemical nitrate sensor, was also developed to detect chemical fluxes. The electrochemical sensor was designed and packaged to conform to a flow through system. The multisensor approach will enable better measurement quality compared to the current ocean sensors. This, in turn, will potentially improve the current understanding of physical and biogeochemical processes from coastal to deep-sea environment.

The pressure sensor element utilized a reinforced …

Evaluation Of The Supply Chain Of Key Industrial Sectors And Its Impact On The Electricity Demand For A Regional Distribution Company, Thiago Arruda Mariotoni

USF Tampa Graduate Theses and Dissertations

Considering the international scenario, in a recent past, the electrical industry was based on the concepts of monopolistic concessions and vertical utilities structures. In Brazil, until recently, the electricity companies were all governmental properties that served restricted monopolized areas. In a similar manner, in the United States, monopolies for certain concession areas were assigned to vertically integrated electric utilities. This monopolistic portfolio brought to the industry, in a generic sense, a lack in the interface between companies and consumers. This fact established a low capacity of obtaining consumer's information and consequently, a low capacity of developing precise demand forecasts.

Lately, …

Cost/Effectiveness Analysis Of Obtaining Operational Estimates Of Reference Evapotranspiration, Peninsular Florida, Usa, Michael G. Kittridge

USF Tampa Graduate Theses and Dissertations

The objective of this study is to conduct a cost/effectiveness analysis of the computation of reference evapotranspiration (ETo) in the peninsular of Florida. A meteorological station on the Fort Meade Mine in Polk County, Florida was used to provide data for the calculation of ETo. Five ETo equations were tested to determine the accuracy and cost/effectiveness to the fully measured ASCE Penman-Monteith (Full ASCE-PM) equation on daily, monthly, and annually time steps. The ETo equations ranged in amounts of parameters from the Full ASCE-PM to the Hargreaves. The energy terms accounted for approximately 90% of the total ETo flux. Solar …