Digital Commons Network^™

Crystal Engineering Of Metal-Carboxylate Based Coordination Polymers, Jianjiang Lu

USF Tampa Graduate Theses and Dissertations

This dissertation endeavors to delineate practical paradigms for crystal engineering based upon the understanding of supramolecular chemistry and self-assembly, i.e. the design and synthesis of novel functional crystalline materials.

Two basic metal-organic building units, Zn(RCO₂)₂(py)₂ and (L₂)M₂(RCO₂)₄ (M = Zn, Cu), as well as nano-scaled secondary building units (nSBUs) that are constructed from Cu₂(RCO₂)₄ are researched and discussed. Design strategies have been developed to propagate these metal-organic synthons into predictable coordination polymer networks. A series of crystal structures, as well as their syntheses …

Sf-Sack: A Smooth Friendly Tcp Protocol For Streaming Multimedia Applications, Sivakumar Bakthavachalu

USF Tampa Graduate Theses and Dissertations

Voice over IP and video applications continue to increase the amount of traffic over the Internet. These applications utilize the UDP protocol because TCP is not suitable for streaming applications. The flow and congestion control mechanisms of TCP can change the connection transmission rate too drastically, affecting the user-perceived quality of the transmission. Also, the TCP protocol provides a level of reliability that may waste network resources, retransmitting packets that have no value. On the other hand, the use of end-to-end flow and congestion control mechanisms for streaming applications has been acknowledged as an important measure to ease or eliminate …

A Program Evaluation Of A Support Group For Children With Sickle Cell Disease, Rachel M. Cohen

USF Tampa Graduate Theses and Dissertations

Children with Sickle Cell Disease (SCD) face medical, psychosocial, and cognitive challenges, which may impede their social and academic functioning. These complications can be lessened through the implementation of comprehensive interventions. This study reviews one comprehensive intervention, a support group, for children with SCD and their families, and reviews the challenges faced by the children and family who participate in the support group as well as those who do not participate. The study has a mixed-method design because the families participated in focus groups, and they completed quantitative instruments, including a knowledge survey, a behavior rating scale, and an instrument …

Mapping A Generation: Oral History Research In Sulphur Springs, Fl, Connie J. Brown

USF Tampa Graduate Theses and Dissertations

This thesis is an analysis of the pros and cons of doing ethnographic and oral history research with elders. The subjects are women born before 1933 and residing in Sulphur Springs, Florida for most of their adolescence and adult lives. They were selected from attendees of the semiannual reunion of students who attended the Sulphur Springs School during the years it served both elementary and junior high.

This method of research, with an elder population presents specific challenges and rewards. The pros and cons of such research are discussed within the context of doing ethnography of Sulphur Springs from the …

An Examination Of A Three-Dimensional Automated Firearms Evidence Comparison System, Natalie G. Carpenter

USF Tampa Graduate Theses and Dissertations

This thesis is an examination of a firearm identification system that creates a three-dimensional image of a bullet in order to record the depth and length of striations occurring along the bullet's surface. Ballistics evidence is an area of forensics in great need of further development. The advent of more sophisticated firearms such as semi-automatic and automatic weapons has increased the need for a matching system that connects bullets found at crime scenes with suspect guns. In the past, control bullets matching ones found at the crime scene have been test fired and then examined by a comparison microscope for …

Symbolic Regression Of Thermo-Physical Model Using Genetic Programming, Ying Zhang

USF Tampa Graduate Theses and Dissertations

The symbolic regression problem is to find a function, in symbolic form, that fits a given data set. Symbolic regression provides a means for function identification. This research describes an adaptive hybrid system for symbolic function identification of thermo-physical model that combines the genetic programming and a modified Marquardt nonlinear regression algorithm.

Genetic Programming (GP) system can extract knowledge from the data in the form of symbolic expressions, i.e. a tree structure, that are used to model and derive equation of state, mixing rules and phase behavior from the experimental data (properties estimation).

During the automatic evolution process of GP, …

Organizational Uncertainty Management: Developing A Framework For Public Relations Practitioner Involvement, Marcia L. Watson

USF Tampa Graduate Theses and Dissertations

This study examined the concept of organizational uncertainty and the involvement of public relations practitioners. Understanding organizational uncertainty is imperative to the success of an organization, but the effects of uncertainty have been relatively undertheorized within public relations.

To close the gap, this study blended multidisciplinary theories pertaining to uncertainty with a triangulated methodological approach. First, this study took a macro-organizational look at uncertainty by analyzing trends in the literature and conducting qualitative in-depth interviews with members of management and employees in an organization. The results of this portion of the study found uncertainty to be multi-layered and the most …

Structural Diversity In Metal-Organic Nanoscale Supramolecular Architectures, Heba Abourahma

USF Tampa Graduate Theses and Dissertations

Supramolecular synthesis has gained much attention in recent years. Such an approach to synthesis represents an attractive alternative to traditional, multi-step synthesis, especially for making complex, nanoscopic structures. Of particular interest, in the context of this work, is the use of metal-organic interactions to direct the self-assembly of nanoscopic architectures. These interactions are highly directional, relatively "strong" (compared to other supramolecular interactions) and kinetically labile, which allows for "self-correction" and in turn the production, often in high yield, of defect-free products. This also means that a number of related, yet structurally diverse products (supramolecular isomers) could be isolated.

The work …

Real Time Digital Signal Processing Adaptive Filters For Correlated Noise Reduction In Ring Laser Gyro Inertial Systems, David A. Doheny

USF Tampa Graduate Theses and Dissertations

Existing opportunities in advanced interceptor, satellite guidance and aircraft navigation technologies, requiring higher signal processing speeds and lower noise environments, are demanding Ring Laser Gyro (RLG) based Inertial Systems to reduce initialization and operational data latency as well as correlated noise magnitudes. Existing signal processing algorithms are often less than optimal when considering these requirements. Advancements in micro-electronic processes have made Application Specific Integrated Circuits (ASIC) a fundamental building block for system implementation when considering higher-level signal processing algorithms.

Research of real time adaptive signal processing algorithms embedded in ASICs for use in RLG based inertial systems will help to …

Development Of A Direct Type Road Roughness Evaluation System, Fengxuan Hu

USF Tampa Graduate Theses and Dissertations

Roughness is an important indicator of pavement riding comfort and safety. It is a condition indicator that should be carefully considered when evaluating primary pavements. At the same time, the use of roughness measurements plays a critical role in the pavement management system.

There are many devices used for roughness evaluation. The major tools used for road roughness quantify are the road profilers. In the thesis research, in order to obtain useful pavement surface condition data for pavement evaluation, two direct type road roughness evaluation systems were developed with the combination of modern sensor technology and computer technology.

The thesis …

Ultrasound Hardware Setup For Cmp Pad Characterization, Bhaskar Vijay Kumar Reddy Tadi

USF Tampa Graduate Theses and Dissertations

Chemical Mechanical Polishing, (CMP), pads made of polyurethane material are utilized in the Integrated Circuit, (IC), industry to planarize wafers between successive process steps. The properties of such pads and their behavior must be known in order to determine under what conditions and for how long they can be used efficiently. This research involved the development of a system to study the properties of such pads. The system developed during this research enabled the pads to be tested under varying physical conditions.

The setup used a combination of several instruments to provide excitation to the pad and acquire a measure …

An Analysis Of Characteristics Of Long And Short Commuters In The United States, Srikanth Vaddepalli

USF Tampa Graduate Theses and Dissertations

An in-depth-analysis was carried out on short, medium and long commuters using the National Household Travel Survey (NHTS) of 2001 and American Community Survey (ACS) of 2000 to determine the role of individual,household, trip and area related characteristics on commute length. The individuals with commute time less than or equal to 15 min were considered as short commuters and individuals with commute time greater than 15 min but less than 60 min were considered as medium commuters and the individuals with commute time 60 min or more were considered as long commuters. The commute time is considered as a link …

Broad-Band Space Conservative On Wafer Network Analyzer Calibrations With More Complex Solt Definitions, Sathya Padmanabhan

USF Tampa Graduate Theses and Dissertations

An improved Short-Open-Load-Thru (SOLT) on-wafer vector network calibration method for broad-band accuracy is proposed. Accurate measurement of on-wafer devices over a wide range of frequency, from DC to high frequencies with a minimum number of space conservative standards has always been desirable. Therefore, the work is aimed at improving the existing calibration methods and suggesting a best "practice" strategy that could be adopted to obtain greater accuracy with a simplified procedure and calibration set.

Quantitative and qualitative comparisons are made to the existing calibration techniques. The advantages and drawbacks of each calibration are analyzed. Prior work done at the University …

High Level Synthesis Of An Image Processing Algorithm For Cancer Detection, Anuleka Bilhanan

USF Tampa Graduate Theses and Dissertations

There is a crucial need for real time detection and diagnosis in digital mammography. To date, most computer aided analysis applications are software driven and normally require long processing times. Digital filtering is often the initial stage in processing mammograms for both automated detection and tissue characterization, which relies on Fourier analysis. In this research the main objective is to lay the groundwork for converting software driven mammography applications to hardware implementations by using Application-Specific Integrated Circuits (ASICs). The long-term goal is to increase processing speed. This research focuses on achieving the main objective by using one specific mammographic image …

Core Issues In Graph Based Perceptual Organization: Spectral Cut Measures, Learning, Padmanabhan Soundararajan

USF Tampa Graduate Theses and Dissertations

Grouping is a vital precursor to object recognition. The complexity of the object recognition process can be reduced to a large extent by using a frontend grouping process. In this dissertation, a grouping framework based on spectral methods for graphs is used. The objects are segmented from the background by means of an associated learning process that decides on the relative importance of the basic salient relationships such as proximity, parallelism, continuity, junctions and common region. While much of the previous research has been focussed on using simple relationships like similarity, proximity, continuity and junctions, this work differenciates itself by …

Indium Oxide As A High Resistivity Buffer Layer For Cdte/Cds Thin Film Solar Cells, Umamaheswari Balasubramanian

USF Tampa Graduate Theses and Dissertations

Transparent conductive oxides are an essential part of technologies that require both large-area electrical contact and optical access in the visible portion of the light spectrum.

SnO₂ doped with Fluorine (SnO₂: F) and In₂O₃ doped with tin (ITO) are the most popular choices of front contacts for CdTe solar cells. In this thesis, CdS/CdTe devices were fabricated with SnO₂: F (MOCVD) and ITO (sputtering) as front contacts without a high resistivity (resistivity relatively greater than front contact) buffer layer. The device characteristics of these devices were low but improved considerably after the …

A Vhdl Implemetation Of The Advanced Encryption Standard-Rijndael Algorithm, Rajender Manteena

USF Tampa Graduate Theses and Dissertations

The National Institute of Standards and Technology (NIST) has initiated a process to develop a Federal information Processing Standard (FIPS) for the Advanced Encryption Standard (AES), specifying an Advanced Encryption Algorithm to replace the Data Encryption standard (DES) the Expired in 1998. NIST has solicited candidate algorithms for inclusion in AES, resulting in fifteen official candidate algorithms of which Rijndael was chosen as the Advanced Encryption Standard.

The Advanced Encryption Standard can be programmed in software or built with pure hardware. However Field Programmable Gate Arrays (FPGAs) offer a quicker, more customizable solution. This research investigates the AES algorithm with …

Synthesis Of Nanoscale Structures In Single Crystal Silicon Carbide By Electron Beam Lithography, Jay A. Bieber

USF Tampa Graduate Theses and Dissertations

Nanostructures were formed on diced specimens of several silicon carbide polytypes and silicon using electron beam lithography. A general introduction to nanostructure synthesis and electron beam lithography,are presented. A scanning electron microscope was retrofitted with a commercially available electron beam lithography package and an electrostatic beam blanker to permit nanoscale lithography to be performed.

A process was first developed and optimized on silicon substrates to expose, poly-methyl-methacrylate (PMMA) resist with an electron beam to make nanoscale nickel masks for reactive ion etching. The masks consist of an array of nickel dots that range in size from 20 to 100 nm …

Effects Of Two-Way Left-Turn Lane On Roadway Safety, Haolei Peng

USF Tampa Graduate Theses and Dissertations

Two-way left-turn lane (TWLTL) is one of the common median treatments on the roadway. It is found that a number of crashes reported in Florida State are related to TWLTLs. This research focused on evaluating the effect of TWLTLs on these crashes by using the statistical crash prediction model that can estimate the expected number of crashes on TWLTLs. The crash database for analysis was extracted from the Florida Traffic Crash Database based on the TWLTL section list provided by FDOT and combined with some traffic characteristics. It consisted of totally 1688 sample sections within a three-year period from 1996 …

A Model To Create Bus Timetables To Attain Maximum Synchronization Considering Waiting Times At Transfer Stops, Anitha Eranki

USF Tampa Graduate Theses and Dissertations

Due to the steady increased in public transportation demand, there is a need to provide more desirable and user-friendly transit systems. Typically, the public transportation timetables are modeled as an assignment problem, which often has objectives such as reducing the cost of operation, minimizing waiting time between transfer points or improving the quality of performance. This research considers the problem of developing synchronized timetables for bus transit systems with fixed routes when a waiting time limit exist at each transfer stops, for the passengers making connections. The objective of this research is to have maximum number of simultaneous arrivals.

Different …

A Learning Approach To Obtain Efficient Testing Strategies In Medical Diagnosis, Saif Fakih

USF Tampa Graduate Theses and Dissertations

Determining the most efficient use of diagnostic tests is one of the complex issues facing the medical practitioners. It is generally accepted that excessive use of tests is common practice in medical diagnosis. Many tests are performed even though the incremental knowledge gained does not affect the course of diagnosis. With the soaring cost of healthcare in the US, there is a critical need for cutting costs of diagnostic tests, while achieving a higher level of diagnostic accuracy. Various decision making tools assisting physicians in diagnosis management have been presented to the literature. One such method, called analytical hierarchy process, …

Teachers’ Mathematics Preparation And Eighth Grade Student Mathematics Achievement: Can An Integrated Learning System Provide Support When Teachers’ Professional Preparation Is Limited?, Christine Kerstyn

USF Tampa Graduate Theses and Dissertations

Teaching vacancies are increasing nationally and the task of placing an experienced, subject-certified teacher in the classroom is getting more difficult for school districts. About 23% of all secondary teachers do not have a minor in their main teaching field. This is true for more than 30% of mathematics teachers and the proportion of such teachers is much greater in high-poverty schools and lower-level classes. In schools with the highest minority enrollments, students have less than a 50% chance of getting a science or mathematics teacher who holds a license and a degree in the field which he or she …

Analysis Of How Mobile Robots Fail In The Field, Jennifer Carlson

USF Tampa Graduate Theses and Dissertations

The considerable risk to human life associated with modern military operations in urban terrain (MOUT) and urban search and rescue (USAR) has led professionals in these domains to explore the use of robots to improve safety. Recent studies on mobile robot use in the field have shown a noticeable lack of reliability in real field conditions. Improving mobile robot reliability for applications such as USAR and MOUT requires an understanding of how mobile robots fail in field environments.

This paper provides a detailed investigation of how ground-based mobile robots fail in the field. Forty-four representative examples of failures from 13 …

Improved Current-Voltage Methods For Rf Transistor Characterization, Charles Passant Baylis Ii

USF Tampa Graduate Theses and Dissertations

In the development of a nonlinear transistor model, several measurements are used to extract equivalent circuit parameters. The current-voltage (IV) characteristic of a transistor is one of the measurement data sets that allows the nonlinear model parameters to be extracted. The accuracy of the IV measurement greatly influences the accuracy of the large-signal model.

Numerous works have reported the inadequacy of traditional static DC IV measurements to accurately predict radio-frequency (RF) behavior for many devices. This inaccuracy results from slow processes in the device that do not have time to completely respond to the quick changes in terminal conditions when …

Longshore Sediment Transport From Northern Maine To Tampa Bay, Florida: A Comparison Of Longshore Field Studies To Relative Potential Sediment Transport Rates Derived From Wave Information Study Hindcast Data, Joseph F. Van Gaalen

USF Tampa Graduate Theses and Dissertations

This paper examines the regional longshore sediment transport pattern of the seaward coast of the United States and Gulf of Mexico from northern Maine to Tampa Bay, Florida. From previous studies it is known that along the coast there are variations in direction of sediment transport known as nodal zones as well as variations in sediment transport rate. Wave Information Study (WIS) hindcast data for the interval 1976 through 1995 (United States Army Corps of Engineers, 2003) provide a spatially continuous model of the regional longshore current directions in the study area.

In chapter one, all available published field studies …

Teachers' Perceptions Of Constructivism As An Organizational Change Model: A Case Study, Leanna Stohr Isaacson

USF Tampa Graduate Theses and Dissertations

This research described and analyzed a single-site case study of an elementary school of 930 pupils, pre-kindergarten through grade five. The six and one-half-year longitudinal study examined teacher's perceptions of both constructivism as an educational organizational change model and of developing a constructivist philosophy in an entire elementary school. The study examined the background and steps that evolved throughout the reform process.

Specific constructs most frequently appearing in the literature relating to developing an organization were studied: (a) philosophical foundations, (b) change, (c) perception, (d) leadership, (e) teachers as leaders and (f) affect. Research on teachers' perspectives examined key elements …

Identification Of The Nucleation Locus In Emulsion Polymerization Processes, Vineet Shastry

USF Tampa Graduate Theses and Dissertations

Particle Nucleation is the forcing function in the Emulsion Polymerization processes and it plays an important role in dictating the final properties of the latex produced. Identification of the main nucleation sites and characterizing them in terms of their size and composition is important for elucidating the mechanism of particle nucleation.

This research focuses on identifying the most likely nucleation locus in emulsion polymerization processes by characterizing the initial conditions of the reaction mixture. In order to achieve this objective, a methodology was devised, which used a non-reacting model emulsion system instead of the original emulsion. The model emulsion system …

Investigation Of Spatial Filtering For Planar Range-Resolved Pulsed Laser Ablated Plume Imaging, James F. Winslow

USF Tampa Graduate Theses and Dissertations

This thesis presents a study of the intensified charge-coupled device (ICCD) imaging of pulsed laser ablated plumes. Two-dimensional imaging of laser ablated plumes is a very important diagnostic for PLD. ICCD array photography is a useful tool for imaging PLD. The images obtained using the standard technique are characterized and compared with ICCD images of an altered plume, ICCD images intentionally violating standard imaging procedures, and film thickness. The depth resolving properties of a pinhole was investigated with the intention of applying it to PLD plume imaging. This results in a more thorough understanding of the depth resolving property of …

Analytical Strategies In Deciding Bus Route Alignments, Sandeep Seshan Iyer

USF Tampa Graduate Theses and Dissertations

In this research a heuristic algorithm is developed for searching and identifying preferred actions as applied to the bus route design problem. The search routine evaluates each subsequent segment added to the route in the context of the value of that segment and also the value of future decisions and opportunities for subsequent segments. The total overall maximum accessibility of the system is calculated using a minimum path network between each node pair and adding the accessibility of all route segments. This is equivalent to assuming that there was a direct shortest path route between every two destinations in the …

Optimizing Long-Term Retention Of Abstract Learning, Danielle Mazur

USF Tampa Graduate Theses and Dissertations

In a distributed learning strategy, study time is spread across multiple study sessions, without increasing total study time. The benefits of distributed practice, also known as spaced practice, on learning of rote-memory tasks (e.g., spelling, addition, and cued-recall of word pairs) are well known. However, few researchers have looked at the effects of distributed practice on the learning of abstract materials (e.g., physics problems, logical deductions, and algebra). We examined the effects of distributed practice on learning the abstract task of matrix multiplication. In Experiment 1, we taught participants matrix multiplication in either a massed (i.e., 0-day interstudy gap), or …