Both doctoral dissertations and master’s theses are archived through the UCF STARS site managed by the UCF Library. Reviewing successful dissertations and theses is an excellent means for current graduate students to develop roadmaps to guide their own work.
Thanks to UCF’s Showcase of Text, Archives, Research, & Scholarship (STARS), individuals may search electronic theses and dissertations (ETD) by advisor: Advisors | Electronic Theses and Dissertations, 2004-2019.
The table below is a repository of the dissertations and theses that have been developed by former students across CECS’s various departments.
Department | Thesis and Dissertation Repository |
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Civil, Environment, and Construction Engineering | Repository Page |
Computer Science | Repository Page |
Electrical & Computer Engineering | Repository Page |
Industrial Engineering & Management Systems | Repository Page |
Materials Science & Engineering | Repository Page |
Mechanical & Aerospace Engineering | Repository Page |
Top CECS PhD Dissertations (by download)
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An Analysis Of Misclassification Rates For Decision Trees
Downloads: 7553Mingyu ZhongThe decision tree is a well-known methodology for classification and regression. In this dissertation, we focus on the minimization of the misclassification rate for decision tree classifiers. We derive the necessary equations that provide the optimal tree prediction, the estimated risk of the tree's prediction, and the reliability of the tree's risk estimation. We carry out an extensive analys...
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Successful Organizational Change: Aligning Change Type With Methods
Downloads: 5893Serina Al-HaddadThe motivation behind this research is the prevalence of challenges and ambiguity associated with successful organizational change and the numerous available approaches in dealing with these challenges and ambiguity. Many definitions and methods have been suggested to manage change; however, organizations still report a high failure rate of their change initiatives. These high failure rates hig...
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A Framework Roadmap For Implementing Lean Six Sigma In Local Governmental Entities
Downloads: 5700Sandra L. FurtererLean Six Sigma is an approach focused on improving quality, reducing variation and eliminating waste in an organization. The concept of combining the principles and tools of Lean Enterprise and Six Sigma has occurred in the literature over the last several years. The majority of Lean Six Sigma applications have been in private industry, focusing mostly on manufacturing applications. The literat...
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Control And Topology Improvements In Half-bridge Dc-dc Converters
Downloads: 5450Songquan DengEfficiency and transient response are two key requirements for DC-DC converters. Topology and control are two key topics in this dissertation. A variety of techniques for DC-DC converter performance improvement are presented in this work. Focusing on the efficiency issue, a variety of clamping techniques including both active and passive methods are presented after the ringing issues in DC-DC c...
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Effects Of Flight Factors On Pilot Performance, Workload, And Stress At Final Approach To Landing Phase Of Flight
Downloads: 4403Kyongsun LeeSince human errors are one of the major causes of flight accidents, the design and operation of the modern aircraft system deals with them seriously. Particularly, the pilot workload on aviation causes human errors. Whenever new procedures are introduced and operated, the aircraft capabilities have been checked in every aspect. However, there has been little study on the impact of the new proce...
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Defining Risk Assessment Confidence Levels For Use In Project Management Communications
Downloads: 4011Gary JohnsonA review of the literature regarding risk management and effective risk communications identified that very few researchers have addressed risk assessment confidence levels when using risk scoring methods. The focus of this research is to develop a definition of risk assessment confidence levels for use in internal project management communications and to evaluate its usefulness. This research ...
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Analysis And Design Optimization Of Multiphase Converter
Downloads: 3700Kejiu ZhangFuture microprocessors pose many challenges to the power conversion techniques. Multiphase synchronous buck converters have been widely used in high current low voltage microprocessor application. Design optimization needs to be carefully carried out with pushing the envelope specification and ever increasing concentration towards power saving features. In this work, attention has been focused ...
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On-chip Spiral Inductor/transformer Design And Modeling For Rf Applications
Downloads: 3571Ji ChenPassive components are indispensable in the design and development of microchips for high-frequency applications. Inductors in particular are used frequently in radio frequency (RF) IC's such as low-noise amplifiers and oscillators. High performance inductor has become one of the critical components for voltage controlled oscillator (VCO) design, for its quality factor (Q) value directly affect...
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Studies Of Liquid Crystal Response Time
Downloads: 3137Haiying WangIn this dissertation, the response time issue of the liquid crystal (LC) devices is investigated in meeting the challenges for display and photonic applications. The correlation between the LC director response time and the optical response time is derived theoretically and confirmed experimentally. A major contribution of this thesis is that, based on the small angle approximation, we derive r...
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Factors Affecting The Practices Of Iso 9001:2000 Quality Management System In Saudi Business Organizations
Downloads: 2882Mohammad Mesaad Al-AsiriSince it's release in Dec 2000, there has been a slow movement towards the new version of ISO 9001:2000 by ISO 9000:1994 certified organizations. Of the 561,747 ISO 9000 certified businesses, 167,210 are certified under the new ISO 9001:2000, which is less than 30 % of the total ISO 9000 certified companies. Although many studies have been conducted to understand and assess the practices of ISO...
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Analysis And Design Optimization Of Resonant Dc-dc Converters
Downloads: 2578Xiang FangThe development in power conversion technology is in constant demand of high power efficiency and high power density. The DC-DC power conversion is an indispensable stage for numerous power supplies and energy related applications. Particularly, in PV micro-inverters and front-end converter of power supplies, great challenges are imposed on the power performances of the DC-DC converter stage, w...
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Impact Of Zinc Orthophosphate Inhibitor On Distribution System Water Quality
Downloads: 2508Xiaotao GuanThis dissertation consists of four papers concerning impacts of zinc orthophosphate (ZOP) inhibitor on iron, copper and lead release in a changing water quality environment. The mechanism of zinc orthophosphate corrosion inhibition in drinking water municipal and home distribution systems and the role of zinc were investigated. Fourteen pilot distribution systems (PDSs) which were identical and...
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Design and Simulation of Device Failure Models for Electrostatic Discharge (ESD) Event
Downloads: 2508Meng MiaoIn this dissertation, the research mainly focused on discussing ESD failure event simulation and ESD modeling, seeking solutions for ESD issues by simulating ESD event and predict possible ESD reliability problem in IC design. The research involves failure phenomenon caused by ESD/ EOS stress, mainly on the thermal failure due to inevitable self-heating during an ESD stress. Standard Complement...
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Modeling, Simulation, And Visualization Of 3d Lung Dynamics
Downloads: 2409Anand SanthanamMedical simulation has facilitated the understanding of complex biological phenomenon through its inherent explanatory power. It is a critical component for planning clinical interventions and analyzing its effect on a human subject. The success of medical simulation is evidenced by the fact that over one third of all medical schools in the United States augment their teaching curricula using p...
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High Performance Low Voltage Power Mosfet For High-frequency Synchronous Buck Converters
Downloads: 2372Boyi YangPower management solutions such as voltage regulator (VR) mandate DC-DC converters with high power density, high switching frequency and high efficiency to meet the needs of future computers and telecom equipment. The trend towards DC-DC converters with higher switching frequency presents significant challenges to power MOSFET technology. Optimization of the MOSFETs plays an important role in i...
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Modeling And Analysis Of Power Mosfets For High Frequency Dc-dc Converters
Downloads: 2110Yali XiongEvolutions in integrated circuit technology require the use of a high-frequency synchronous buck converter in order to achieve low cost, low profile, fast transient response and high power density. However, high frequency operation leads to increased power MOSFET switching losses. Optimization of the MOSFETs plays an important role in improving converter performance. This dissertation focuses o...
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Seepage and Stability Analysis of the Earth Dams under Drawdown Conditions by using the Finite Element Method
Downloads: 1880Salama Al-LabbanOne of the major concerns in the behavior of an earth dam is the change in the exit gradient and the impact on the slope stability under drawdown conditions. Drawdown can cause increased seepage forces on the upstream slope which may result in the movement of soil particles in the flow direction and cause erosion problems. In this research, a numerical approach, based on the finite element meth...
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Design of High Efficiency Brushless Permanent Magnet Machines and Driver System
Downloads: 1866Chengyuan HeThe dissertation is concerned with the design of high-efficiency permanent magnet synchronous machinery and the control system. The dissertation first talks about the basic concept of the permanent magnet synchronous motor (PMSM) design and the mathematics design model of the advanced design method. The advantage of the design method is that it can increase the high load capacity at no cost of ...
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Detecting Anomalies From Big Data System Logs
Downloads: 1441Siyang LuNowadays, big data systems (e.g., Hadoop and Spark) are being widely adopted by many domains for offering effective data solutions, such as manufacturing, healthcare, education, and media. A common problem about big data systems is called anomaly, e.g., a status deviated from normal execution, which decreases the performance of computation or kills running programs. It is becoming a necessity t...
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On-Chip ESD Protection Design: Optimized Clamps
Downloads: 1016Linfeng HeThe extensive use of Integrated Circuits (ICs) means complex working conditions for these tiny chips. To guarantee the ICs could work properly in various environments, some special protection strategies are required to improve the reliability of system. From all the possible reliability issues, the electrostatics discharge (ESD) might be the most common one. The peak current of electrostatics ...
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Thin-fIlm Lithium Niobate Integrated Photonics on Silicon for Electro- and Nonlinear-optic Applications
Downloads: 656Amirmahdi HonardoostIn order to overcome the drawbacks associated with conventional bulk lithium niobate photonic, thin-film lithium-niobate-on-silicon has been pursued recently. This work presents contributions made to electro-, and nonlinear-optic applications of this technology. For electrooptic applications, detailed modeling and design guidelines of optical and radio-frequency parameters of ultracompact modul...
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Analyzing the Blockchain Attack Surface: A Top-down Approach
Downloads: 472Muhammad SaadBlockchains enable secure asset exchange in a distributed system, thereby facilitating innovative applications such as cryptocurrencies and smart contracts. Although the cryptographic constructs of blockchains are highly secure, however, their practical deployments are vulnerable to various attacks due to their application-specific policies, and their peer-to-peer (P2P) network intricacies. In ...
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Improving Security of Crypto Wallets in Blockchain Technologies
Downloads: 404Hossein RezaeighalehA big challenge in blockchain and cryptocurrency is securing the private key from potential hackers. Nobody can rollback a transaction made with a stolen key once the network confirms it. The technical solution to protect private keys is the cryptocurrency wallet, software, hardware, or a combination to manage the keys. In this dissertation, we try to investigate the significant challenges in e...
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Model-Form Uncertainty Quantification in Prognosis and Fleet Management with Physics-Informed Neural Networks
Downloads: 387Arinan De Piemonte DouradoPrognosis and health management play an important role in the control of costs associated with the operation of large industrial equipment. By properly comprehending hardware degradation and accurately predicting the remaining useful life of such equipment, we can significantly lower operational costs by reducing asset downtime and maintenance interventions. However, complex interactions betwee...
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Efficient Data Structures for Text Processing Applications
Downloads: 79Paniz AbedinThis thesis is devoted to designing and analyzing efficient text indexing data structures and associated algorithms for processing text data. The general problem is to preprocess a given text or a collection of texts into a space-efficient index to quickly answer various queries on this data. Basic queries such as counting/reporting a given pattern's occurrences as substrings of the original te...
Top CECS Master’s Theses (by download)
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A Comparison Of Aluminum And Iron-based Coagulants For Treatment Of Surface Water In Sarasota County, Florida
Downloads: 14764David YongeIn this research, five different coagulants were evaluated to determine their effectiveness at removing turbidity, color and dissolved organic carbon (DOC) from a surface water in Sarasota County, Florida. Bench-scale jar tests that simulated conventional coagulation, flocculation, and sedimentation processes were used. Iron-based coagulants (ferric chloride and ferric sulfate) and aluminum-bas...
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Effects Of The Soil Properties On The Maximum Dry Density Obtained Fro
Downloads: 7827Andres ArveloIn the construction of highways, airports, and other structures, the compaction of soils is needed to improve its strength. In 1933 Proctor developed a laboratory compaction test to determine the maximum dry density of compacted soils, which can be used for specifications of field compaction. The Compaction of soils is influenced by many factors, the most common are the moisture content, the so...
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Autonomous Quadcopter Videographer
Downloads: 7741Quiquia Rey CoaguilaIn recent years, the interest in quadcopters as a robotics platform for autonomous photography has increased. This is due to their small size and mobility, which allow them to reach places that are difficult or even impossible for humans. This thesis focuses on the design of an autonomous quadcopter videographer, i.e. a quadcopter capable of capturing good footage of a specific subject. In orde...
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A Comparison And Evaluation of common Pid Tuning Methods
Downloads: 6497Justin YouneyThe motivation behind this thesis is to consolidate and evaluate the most common Proportional Integral Derivative (PID) controller tuning techniques used in industry. These are the tuning techniques used when the plant transfer function is not known. Many of these systems are poorly tuned because such consolidated information is not easily found in one single source such as this thesis. Once on...
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Methods and Techniques Used for Job Shop Scheduling
Downloads: 5526Yoo Baik YangThe job shop scheduling problem, in which we must determine the order or sequence for processing a set of jobs through several machines in an optimum manner, has received considerable attention. In this paper a number of the methods and techniques are reviewed and an attempt to categorize them according to their appropriateness for effective use in job shop scheduling has been made. Approaches ...
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An Authentic Ecg Simulator
Downloads: 4861Paul MichalekAn ECG (electrocardiogram) simulator is an electronic tool that plays an essential role in the testing, design, and development of ECG monitors and other ECG equipment. Principally an ECG simulator provides ECG monitors with an electrical signal that emulates the human heart's electrical signal so that the monitor can be tested for reliability and important diagnostic capabilities. However, the...
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A Framework for Measuring and Analyzing Customer Satisfaction at Computer Service Company using Lean Six Sigma
Downloads: 4146Mohammed AbboodiThe computer service industry has been expanding dramatically due to the increase in the number of computing machineries in the last two decades. The entrance of large size companies in the market and the release of online tools that have the ability for diagnosing and troubleshooting hardware and software issues have boosted the competition. In the meantime, many of the small and medium size c...
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Coupling Efficiency and Alignment Sensitivity of Single Mode Optical Fibers
Downloads: 3963James Mathew MartinCoupling efficiency an alignment sensitivity models for the coupling of light from a fundamental mode Gaussian light beam into a single mode optical fiber are given. Experimental results are presented which verify the coupling and misalignment predictions of the models. Data were taken at two wavelengths: 0.6328 and 0.8460 micrometers. The light sources were a HeNe laser and a GaAlAs laser resp...
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Aggregate Production Planning Techniques and Comparison
Downloads: 3849Fariborz MazaheriAggregate production planning models are of the greatest importance to operations management, since these plans enable management to utilize the major resources at its command. In this report the structure of the aggregate planning problem and a number of different approaches are reviewed and presented. Approaches are classified in three categories: a) workforce smoothing models, b) productio...
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Forced Convection Cooling of Electric Motors Using Enhanced Surfaces
Downloads: 3486Mohammed AlmaghrabiElectric motors are extensively engaged in industrial and commercial applications such as electrical cars, energy-conversion systems, elevators, and actuators for aircrafts. Due to the significant internal heat generation, it is usually a challenge to design and manufacture high power density, high reliability, and low cost electric motors with superior performance. One of the efficient ways to...
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Comparison Of Single Stage And Two Stage Stage Grid-tie Inverters
Downloads: 3244Keith MansfieldThis thesis compares two methods of designing grid-tie inverters. The first design topology is a traditional two stage approach consisting of an isolated DC-DC converter on the input followed by a high switching frequency SPWM (Sinusoidal Pulse Width Modulation) stage to produce the required low frequency sine wave output. The novel second design approach employs a similar DC-DC input stage cap...
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A Comparison of Corrosion Rates Determined by Polarization Resistance Measurements for Zinc and Cadmium Metal Immersed in Nonstirred Aqueous Portland Cement Solution
Downloads: 3000William James MooreThe effect of nonstirred aqueous Portland cement solution on the corrosion rates of zinc and cadmium metal using Tafel extrapolation and linear polarization measurements has been investigated. Results indicate that for the corrosion systems under investigation, zinc metal has a higher corrosion potential and lower corrosion rate than cadmium metal.
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Scrubber Design for Phosphoric Acid Production Facility
Downloads: 2451Edward E. MayerThis report is an examination of the practical design of a phosphoric acid production facility wet scrubber. It includes a brief background of the Florida Phosphate Industry, in addition to the rules and regulations affecting the emission of fluoride contaminates. The theoretical aspects of a packed absorption tower is discussed prior to the actual design of a cross-flow wet scrubber of the typ...
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The Design of Standard Cell VLSI Circuits
Downloads: 2361Randolph L. AbidinThere are basically three methods of designing Very Large Scale Integrated (VLSI) circuits; Gate Array, Standard Cell, and Full Custom. The objective of this research is to design a VLSI circuit using the Standard Cell approach. A prime requisite for a successful design of these circuits is an integrated Computer Aided Design (CAD) system. The chip design requirements for an integrated CAD syst...
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Design Optimization Of Solid Rocket Motor Grains For Internal Ballistic Performance
Downloads: 2310Roger HainlineThe work presented in this thesis deals with the application of optimization tools to the design of solid rocket motor grains per internal ballistic requirements. Research concentrated on the development of an optimization strategy capable of efficiently and consistently optimizing virtually an unlimited range of radial burning solid rocket motor grain geometries. Optimization tools were applie...
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Theory of Eddy Currents for Nondestructive Testing
Downloads: 2241Craig Charles BiddleEddy current inspection methods are used extensively in industry for the nondestructive testing of a wide variety of materials and product applications. The general theory of eddy current inspection is described. Equations defining the depth of penetration are derived from Maxwell's equations. Signal analysis methods are described using coil impedance diagrams. The impedance diagrams for a n...
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Filter Settle Time for Signal Processing Applications
Downloads: 2168Michael T. McCordIn this paper, the step modulated sine wave [u(t)Asin2pft] response of the low-pass, band-pass, and high-pass filters are evaluated. Butterworth filters from the first order on up to the ideal filter are analyzed, and expressions for the settle times developed. The longest settle time occurs for the ideal filter, with all other filters taking progressively less time to settle as the order decre...
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Design and Modeling of a Heat Exchanger for Porous Combustor Powered Steam Generators in Automotive Industry
Downloads: 2047Apratim DasguptaA major challenge faced by automobile manufacturers is to achieve reduction of particulate emission to acceptable standards, as the emission standards become more and more stringent. One of the ecologically friendly options to reduce emissions is to develop external combustion in a steam engine as a replacement of the internal combustion engine. There are multiple factors, other than pollution ...
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Design And Fabrication Of A Full-featured Labscale Hybrid Rocket Engine
Downloads: 2040Kyle PlattThe design, development, integration and testing of a full-featured, Lab-Scale Hybrid Rocket Engine was not only envisioned to be the chosen method of putting student payloads into space, but to be an invaluable teaching resource. The subject of the present thesis is the analysis, design, development, integration and demonstration of a lab-scale hybrid rocket motor. The overarching goal of this...
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A Framework For Process Data Collection, Analysis, And Visualization In Construction Projects
Downloads: 2017Reza AkhavianAutomated data collection, simulation and visualization can substantially enhance the process of designing, analysis, planning, and control of many engineering processes. In particular, managing processes that are dynamic in nature can significantly benefit from such techniques. Construction projects are good examples of such processes where a variety of equipment and resources constantly inter...
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Microstructure and Chemistry Evaluation of Direct Metal Laser Sintered 15-5 PH Stainless Steel
Downloads: 1979Kevin Coffy15-5PH stainless steel is an important alloy in the aerospace, chemical, and nuclear industries for its high strength and corrosion resistance at high temperature. Thus, this material is a good candidate for processing development in the direct metal laser sintering (DMLS) branch of additive manufacturing. The chemistry and microstructure of this alloy processed via DMLS was compared to its con...
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The Challenges and Barriers Facing Successful Lean Implementation in the Qatari Manufacturing Organizations
Downloads: 1405Abdulwahab AlyousefThe success of Toyota, the inventor of Lean Systems has drawn the attention of academics, researchers, and executives in the last decades. However, existing lean research is largely focused on developed economies in Europe, the Americas, and in Southeast Asia with little focus on the Arab world in general and Qatar specifically. There has been an emergence of manufacturing organizations and Sm...
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Predicting Students' Academic Performance with Decision Tree and Neural Network
Downloads: 952Junshuai FengEducational Data Mining (EDM) is a developing research field that involves many techniques to explore data relating to educational background. EDM can analyze and resolve educational data with computational methods to address educational questions. Similar to EDM, neural networks have been utilized in widespread and successful data mining applications. In this paper, synthetic datasets are empl...
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Mechanical Properties of Boron Carbide (B4C)
Downloads: 863Ruslan KuliievBoron carbide (B4C) is one of the most important opaque boride ceramics that has high hardness and Young's modulus that along with low density lead to a significant resistance to ballistic impact and, thus, B4C is broadly used as a protective material. B4C has also high neutron capturing cross section; therefore, it is used as control rods and neutron absorption shielding in nuclear reactors. I...
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Hybrid Physics-informed Neural Networks for Dynamical Systems
Downloads: 722Renato Giorgiani do NascimentoOrdinary differential equations can describe many dynamic systems. When physics is well understood, the time-dependent responses are easily obtained numerically. The particular numerical method used for integration depends on the application. Unfortunately, when physics is not fully understood, the discrepancies between predictions and observed responses can be large and unacceptable. In this t...