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Title: Tessellation for computer image generation.
Creator: Panzitta, Michael James, Bauer, Christian S., Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; Of the vast number of algorithms used in modern computer image generation, most rely upon data bases comprised of polygons. This becomes a severe impediment when curved objects must be modeled and displayed with an acceptable level of speed and accuracy. A technique is needed to provide a means of modeling curved surfaces, storing them in a data base, and displaying them using existing algorithms. Tessellation is one method of...
Show moreUniversity of Central Florida College of Engineering Thesis; Of the vast number of algorithms used in modern computer image generation, most rely upon data bases comprised of polygons. This becomes a severe impediment when curved objects must be modeled and displayed with an acceptable level of speed and accuracy. A technique is needed to provide a means of modeling curved surfaces, storing them in a data base, and displaying them using existing algorithms. Tessellation is one method of achieving such goals.
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Date Issued: 1987
Identifier: CFR0001375, ucf:52922
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0001375

Title: THE IMPLICATIONS OF VIRTUAL ENVIRONMENTS IN DIGITAL FORENSIC INVESTIGATIONS.
Creator: Patterson, Farrah, Lang, Sheau-Dong, Guha, Ratan, Zou, Changchun, University of Central Florida
Abstract / Description: This research paper discusses the role of virtual environments in digital forensic investigations. With virtual environments becoming more prevalent as an analysis tool in digital forensic investigations, it's becoming more important for digital forensic investigators to understand the limitation and strengths of virtual machines. The study aims to expose limitations within commercial closed source virtual machines and open source virtual machines. The study provides a brief overview of...
Show moreThis research paper discusses the role of virtual environments in digital forensic investigations. With virtual environments becoming more prevalent as an analysis tool in digital forensic investigations, it's becoming more important for digital forensic investigators to understand the limitation and strengths of virtual machines. The study aims to expose limitations within commercial closed source virtual machines and open source virtual machines. The study provides a brief overview of history digital forensic investigations and virtual environments, and concludes with an experiment with four common open and closed source virtual machines; the effects of the virtual machines on the host machine as well as the performance of the virtual machine itself. My findings discovered that while the open source tools provided more control and freedom to the operator, the closed source tools were more stable and consistent in their operation. The significance of these findings can be further researched by applying them in the context of exemplifying reliability of forensic techniques when presented as analysis tool used in litigation.
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Date Issued: 2011
Identifier: CFE0004152, ucf:49050
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004152

Title: RECONFIGURABLE ARCHITECTURE FOR H.264/AVC VARIABLE BLOCK SIZE MOTION ESTIMATION BASED ON MOTION ACTIVITY AND ADAPTIVE SEARCH RANGE.
Creator: Kodipyaka, Sumedha, Lee, Jooheung, University of Central Florida
Abstract / Description: Motion Estimation (ME) technique plays a key role in the video coding systems to achieve high compression ratios by removing temporal redundancies among video frames. Especially in the newest H.264/AVC video coding standard, ME engine demands large amount of computational capabilities due to its support for wide range of different block sizes for a given macroblock in order to increase accuracy in finding best matching block in the previous frames. We propose scalable architecture for H.264...
Show moreMotion Estimation (ME) technique plays a key role in the video coding systems to achieve high compression ratios by removing temporal redundancies among video frames. Especially in the newest H.264/AVC video coding standard, ME engine demands large amount of computational capabilities due to its support for wide range of different block sizes for a given macroblock in order to increase accuracy in finding best matching block in the previous frames. We propose scalable architecture for H.264/AVC Variable Block Size (VBS) Motion Estimation with adaptive computing capability to support various search ranges, input video resolutions, and frame rates. Hardware architecture of the proposed ME consists of scalable Sum of Absolute Difference (SAD) arrays which can perform Full Search Block Matching Algorithm (FSBMA) for smaller 4x4 blocks. It is also shown that by predicting motion activity and adaptively adjusting the Search Range (SR) on the reconfigurable hardware platform, the computational cost of ME required for inter-frame encoding in H.264/AVC video coding standard can be reduced significantly. Dynamic Partial Reconfiguration is a unique feature of Field Programmable Gate Arrays (FPGAs) that makes best use of hardware resources and power by allowing adaptive algorithm to be implemented during run-time. We exploit this feature of FPGA to implement the proposed reconfigurable architecture of ME and maximize the architectural benefits through prediction of motion activities in the video sequences ,adaptation of SR during run-time, and fractional ME refinement. The implemented ME architecture can support real time applications at a maximum frequency of 90MHz with multiple reconfigurable regions. When compared to reconfiguration of complete design, partial reconfiguration process results in smaller bitstream size which allows FPGA to implement different configurations at higher speed. The proposed architecture has modular structure, regular data flow, and efficient memory organization with lower memory accesses. By increasing the number of active partial reconfigurable modules from one to four, there is a 4 fold increase in data re-use. Also, by introducing adaptive SR reduction algorithm at frame level, the computational load of ME is reduced significantly with only small degradation in PSNR (0.1dB).
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Date Issued: 2010
Identifier: CFE0003316, ucf:48488
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003316

Title: Conversion and Validation of SIGART Program, a Progressive Traffic Signal Lights System Computer Model.
Creator: Troyan, Dennis F., McEwan, Stuart, Engineering
Abstract / Description: Florida Technological University College of Engineering Thesis
Date Issued: 1972
Identifier: CFR0011995, ucf:53082
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0011995

Title: Financial Forest.
Creator: Carlson, Karen, Moshell, Michael, Lindgren, Robb, Underberg-Goode, Natalie, University of Central Florida
Abstract / Description: Regular savings behavior is critical for low-income Americans to achieve financial mobility. New technology tools are being used to improve personal awareness and attention to financial goals. This thesis reviews mobile learning (mLearning) research and leading commercial personal finance smartphone apps, both of which inform the design of Financial Forest, a savings app. Participants in the 4-week Financial Forest savings study are found to have a statistically significant improved...
Show moreRegular savings behavior is critical for low-income Americans to achieve financial mobility. New technology tools are being used to improve personal awareness and attention to financial goals. This thesis reviews mobile learning (mLearning) research and leading commercial personal finance smartphone apps, both of which inform the design of Financial Forest, a savings app. Participants in the 4-week Financial Forest savings study are found to have a statistically significant improved perception of the difficulty of building an emergency fund.
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Date Issued: 2014
Identifier: CFE0005143, ucf:50682
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005143

Title: From Frances Elliott Clark to Today's Higher Education Music Educators: An Exploration of the Perceptions and Usage of Digital Audio via Electronic Reserves and Digital Databases.
Creator: LoPresti, Kathleen, Gunter, Glenda, Hopp, Carolyn, Hartshorne, Richard, Palmer, Mary, University of Central Florida
Abstract / Description: Currently, there is a lack of research on the use of digital audio from the perspective of music educators in higher education. Researchers [for example: James Mason and Jared Wiercinski (2009), Jean E. Ferguson (2004), Richard Griscom (2003), Scott R. Phinney (2005) and Kathryn Sullivan, John J. Stafford, and Cindy Badilla-Melendez (2004)] have, however, studied streaming audio in relation to university students and libraries. Knowing the perceptions of instructors is important, because...
Show moreCurrently, there is a lack of research on the use of digital audio from the perspective of music educators in higher education. Researchers [for example: James Mason and Jared Wiercinski (2009), Jean E. Ferguson (2004), Richard Griscom (2003), Scott R. Phinney (2005) and Kathryn Sullivan, John J. Stafford, and Cindy Badilla-Melendez (2004)] have, however, studied streaming audio in relation to university students and libraries. Knowing the perceptions of instructors is important, because according to Oblinger (&) Oblinger (2005), they may not have the same perceptions as the students. Additionally, Moseley (2010) recommended further qualitative studies concerning the perceptions of faculty regarding technology utilization to allow more in-depth information to be discovered on the topic.The purpose of this qualitative multiple case study was to analyze music educators' perceptions and usage of the use of digital audio (e-reserves and streamed databases) in higher education. This research explained how and why these educators utilize (or do not utilize) streaming audio via e-reserves and databases. The research questions used for this study were: (a) How is streaming audio (-) in the form of e-reserves and subscription-based databases (Naxos and Classical Music Library (-) being utilized by college/university level educators at the two studied institutions?; (b) What are the perceptions of the participating music department faculty members on the subject of streaming audio?; and (c) What factors, regarding the use of streaming audio, are considered by the participating instructors to be important? Results of this research revealed participant instructors did utilize digital audio recordings, but not all of the instructors utilized streaming audio. The results of this study also revealed possible reasons for the lack of use of available streaming audio resources.
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Date Issued: 2014
Identifier: CFE0005522, ucf:50302
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005522

Title: Inverse Intuition: Repurposing as a Method to Create New Artifacts, to Invent new Practices, and to Produce new Knowledge.
Creator: Jones, Warren, Mauer, Barry, Grajeda, Anthony, Bowdon, Melody, Koller, Lynn, University of Central Florida
Abstract / Description: This dissertation argues that Digital Natives, rather than employing novel ways of thinking (such as those suggested by Walter Ong's concept of Second Orality), are in fact employing a way of thinking that has always existed: repurposing. Ruth Oldenziel discusses how, historically, women used (")a kind of mental quality(") enabling them to re-use objects in novel ways to accomplish more of life's tasks. My research led me to investigate how a wide variety of people, especially historically...
Show moreThis dissertation argues that Digital Natives, rather than employing novel ways of thinking (such as those suggested by Walter Ong's concept of Second Orality), are in fact employing a way of thinking that has always existed: repurposing. Ruth Oldenziel discusses how, historically, women used (")a kind of mental quality(") enabling them to re-use objects in novel ways to accomplish more of life's tasks. My research led me to investigate how a wide variety of people, especially historically marginalized people, used this kind of mental quality. This dissertation explores repurposing's real world uses as well as its uses in narratives, specifically dystopia and apocalyptic narratives. Within these narratives, repurposing plays a similar role to repurposing in the real world, filling the gap between a survival mode of life and a science/technology driven society. The last part of this dissertation explores the place of repurposing among a myriad of current concepts concerning creativity.
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Date Issued: 2013
Identifier: CFE0005010, ucf:50013
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005010

Title: Examining the Narcissism Trend in Generation Y Through Digital Narrative Film.
Creator: Ingle, Joshua, Jones, Robert, Peters, Philip, Peterson, Lisa, University of Central Florida
Abstract / Description: This thesis presents an account of the making of 15 Minutes of Faye, a microbudget feature-length film created in partial fulfillment of the requirements for the degree of Master of Fine Arts in Film and Digital Media at the University of Central Florida. It chronicles the motivation behind the creation of the film, the entire creation process, plans for its distribution, and reflections on lessons learned during the creation process. The film itself was designed to challenge its viewers with...
Show moreThis thesis presents an account of the making of 15 Minutes of Faye, a microbudget feature-length film created in partial fulfillment of the requirements for the degree of Master of Fine Arts in Film and Digital Media at the University of Central Florida. It chronicles the motivation behind the creation of the film, the entire creation process, plans for its distribution, and reflections on lessons learned during the creation process. The film itself was designed to challenge its viewers with the gross self-absorption of its fame-seeking protagonist, in order to promote public discourse about Generation Y's sense of entitlement, which has been well-documented in academic literature. It is the author's hope that this document will promote awareness of the film's subject matter, and will also aid others seeking to create microbudget feature-length films.
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Date Issued: 2014
Identifier: CFE0005185, ucf:50643
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005185

Title: Testament: Mastering and Transcending the Microbudget Model for a Feature Film.
Creator: Ritter, Timothy, Mills, Lisa, Shults, Katherine, Sandler, Barry, University of Central Florida
Abstract / Description: Testament is a feature film serving as part of Tim Ritter's thesis requirements for earning a Master of Fine Arts in the Entrepreneurial Digital Cinema program at the University of Central Florida. The film follows a bitter former follower of a marginally popular social-justice movement who must keep the movement alive after its mysterious leader is killed violently and publicly. The drama, set in an fictional land known as The Commonwealth, presents a modern-day retelling of the life of St....
Show moreTestament is a feature film serving as part of Tim Ritter's thesis requirements for earning a Master of Fine Arts in the Entrepreneurial Digital Cinema program at the University of Central Florida. The film follows a bitter former follower of a marginally popular social-justice movement who must keep the movement alive after its mysterious leader is killed violently and publicly. The drama, set in an fictional land known as The Commonwealth, presents a modern-day retelling of the life of St. Peter in the years after the death of Jesus, creating a new context for familiar Biblical tales and morals while also examining the high personal costs of changing the world.Testament has been produced for well under $50,000 as part of the microbudget requirements of the UCF Film program. In creating an epic with minimal resources, innovation has filled the void left by most films' higher budgets, with the crew recycling a small number of locations to serve as several different locations and using a large cast sparingly to avoid becoming overly reliant on many actors who aren't getting paid. This document details the theories and methodology behind the preparation and planned production of the film, as well as the approach planned for its distribution.
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Date Issued: 2015
Identifier: CFE0005702, ucf:50145
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005702

Title: Mapping Addiction: A Digital Psychogeographic Approach to America's Addiction Epidemic.
Creator: Benjamin, Clayton, Mauer, Barry, Applen, JD, Janz, Bruce, Oleksiak, Timothy, University of Central Florida
Abstract / Description: iiiABSTRACTFocusing on policy consultation, my dissertation consults on the current US addiction epidemic and aims to answer, (")What is our disposition to addiction?(") Borrowing and clarifying Ulmer's MEmorial method, as established in his text Electronic Monuments, the dissertation combines the ancient Greek practice of theoria, Deleuzian theory, and psychogeographic counter-mapping methods to trace ways in which ideological apparatuses construct addiction. The aim of the dissertation is...
Show moreiiiABSTRACTFocusing on policy consultation, my dissertation consults on the current US addiction epidemic and aims to answer, (")What is our disposition to addiction?(") Borrowing and clarifying Ulmer's MEmorial method, as established in his text Electronic Monuments, the dissertation combines the ancient Greek practice of theoria, Deleuzian theory, and psychogeographic counter-mapping methods to trace ways in which ideological apparatuses construct addiction. The aim of the dissertation is to reveal an abject value by constructing MEmorials which provide space for individuals to mourn loss and see their relation to that loss. Through mourning, individuals strengthen their ties to other community members and new policy can be made possible. Currently there is not an AIDS-like quilt for the victims of the addiction epidemic; therefore, the dissertation proposes the construction of a physical and electronic MEmorial to addiction. By conducting a psychogeography, a method directly tied to logic and reasoning appropriate to electracy, I traced the abject value of desire as it is constructed through the assemblages that construct the values of the Bradenton, FL community. The psychogeography revealed a categorical image (")DE(") which I traced through the ideological state apparatuses working their effects on Bradenton, FL. The image also connects to Bradenton, FL to the larger National War on Drugs through the star emblem of John Wayne. Concluding from the method, I argue to create a MEmorial to addiction at the John Wayne Birthplace Museum to reveal the horror of our communal desires and call for national drug policy reform.
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Date Issued: 2019
Identifier: CFE0007785, ucf:52358
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007785

Title: The Visual Divide: Islam vs. The West, Image Peception in Cross-Cultural Contexts.
Creator: Akil, Hatem, Mauer, Barry, Scott, John, Gleyzon, Francois-Xavier, Janz, Bruce, University of Central Florida
Abstract / Description: Do two people, coming from different cultural backgrounds, see the same image the same way? Do we employ technologies of seeing that embed visuality within relentless cultural and ideological frames? And, if so, when does visual difference become a tool for inclusion and exclusion? When does it become an instrument of war? I argue that we're always implicated in visuality as a form of confirmation bias, and that what we see is shaped by preexisting socio-ideological frames that can only be...
Show moreDo two people, coming from different cultural backgrounds, see the same image the same way? Do we employ technologies of seeing that embed visuality within relentless cultural and ideological frames? And, if so, when does visual difference become a tool for inclusion and exclusion? When does it become an instrument of war? I argue that we're always implicated in visuality as a form of confirmation bias, and that what we see is shaped by preexisting socio-ideological frames that can only be liberated through an active and critical relationship with the image. The image itself, albeit ubiquitous, is never unimplicated - at once violated and violating; with both its creator and its perceiver self-positioned as its ultimate subject.I follow a trace of the image within the context of a supposed Islam versus the West dichotomy; its construction, instrumentalization, betrayals, and incriminations. This trace sometimes forks into multiple paths, and at times loops unto itself, but eventually moves towards a traversal of a visual divide. I apply the trace as my methodology in the sense suggested by Derrida, but also as a technology for finding my way into and out of an epistemological labyrinth.The Visual Divide comprises five chapters: Chapter One presents some of the major themes of this work while attempting a theoretical account of image perception within philosophical and cross-cultural settings. I use this account to understand and undermine contemporary rhetoric (as in the works of Samuel Huntington and Bernard Lewis) that seems intent on theorizing a supposed cultural and historical dichotomies between Islam and the West.In Chapter Two, I account for slogan chants heard at Tahrir Square during the January 25 Egyptian revolution as tools to discovering a mix of technology, language and revolution that could be characterized as hybrid, plural and present at the center of which lies the human body as subject to public peril. Chapter Three analyzes a state of visual divide where photographic evidence is posited against ethnographic reality as found in postcards of nude and semi-nude Algerian Muslim women in the 19th century. I connect this state to a chain of visual oppositions that place Western superiority as its subject and which continues to our present day with the Abu Ghraib photographs and the Mohammed cartoons, etc. Chapter Four deploys the image of Mohamed al-Durra, a 3rd grader who was shot dead, on video, at a crossroads in Gaza, and the ensuing attempts to reinterpret, recreate, falsify and litigate the meaning of the video images of his death in order to propagate certain political doxa. I relate the violence against the image, by the image, and despite the image, to a state of pure war that is steeped in visuality, and which transforms the act of seeing into an act of targeting.In Chapter Five, I integrate the concept of visuality with that of the human body under peril in order to identify conditions that lead to comparative suffering or a division that views humanity as something other than unitary and of equal value. I connect the figures of der Muselmann, Shylock, Othello, the suicide bomber, and others to subvert a narrative that claims that one's suffering is deeper than another's, or that life could be valued differently depending on the place of your birth, the color of your skin, or the thickness of your accent.Finally, in the Epilogue: Tabbouleh Deterritorialized, I look at the interconnected states of perception and remembering within diasporic contexts. Cultural identity (invoked by an encounter with tabbouleh on a restaurant menu in Orlando) is both questioned and transformed and becomes the subject of perception and negotiation.
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Date Issued: 2011
Identifier: CFE0004084, ucf:49144
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004084

Title: OF GODS, BEASTS AND MEN: DIGITAL SCULPTURE.
Creator: Salisbury, Brian, Kovach, Keith, University of Central Florida
Abstract / Description: My most recent body of work explores the synthesis of my influences, interests and life experiences into imagery of common themes: The expression of dynamic figures and forms and colors in digital 3d space, cinematic composition, and vibrant color, expressed through a semblance of Aztec culture and wildlife. My sculptures of nature and ancient culture are created using contemporary digital art creation technologies and techniques. I examine the art and religion of the Aztecs and the universal...
Show moreMy most recent body of work explores the synthesis of my influences, interests and life experiences into imagery of common themes: The expression of dynamic figures and forms and colors in digital 3d space, cinematic composition, and vibrant color, expressed through a semblance of Aztec culture and wildlife. My sculptures of nature and ancient culture are created using contemporary digital art creation technologies and techniques. I examine the art and religion of the Aztecs and the universal search for understanding and purpose in the world and the forces around and beyond us.
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Date Issued: 2009
Identifier: CFE0002587, ucf:48278
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002587

Title: DIGITAL PULSE WIDTH MODULATOR TECHNIQUES FOR DC - DC CONVERTERS.
Creator: Batarseh, Majd, Batarseh, Issa, University of Central Florida
Abstract / Description: Recent research activities focused on improving the steady-state as well as the dynamic behavior of DC - DC converters for proper system performance, by proposing different design methods and control approaches with growing tendency to using digital implementation over analog practices. Because of the rapid advancement in semiconductors and microprocessor industry, digital control grew in popularity among PWM converters and is taking over analog techniques due to availability of fast speed...
Show moreRecent research activities focused on improving the steady-state as well as the dynamic behavior of DC - DC converters for proper system performance, by proposing different design methods and control approaches with growing tendency to using digital implementation over analog practices. Because of the rapid advancement in semiconductors and microprocessor industry, digital control grew in popularity among PWM converters and is taking over analog techniques due to availability of fast speed microprocessors, flexibility and immunity to noise and environmental variations. Furthermore, increased interest in Field Programmable Gate Arrays (FPGA) makes it a convenient design platform for digitally controlled converters. The objective of this research is to propose new digital control schemes, aiming to improve the steady-state and transient responses of a high switching frequency FPGA-based digitally controlled DC-DC converters. The target is to achieve enhanced performance in terms of tight regulation with minimum power consumption and high efficiency at steady-state, as well as shorter settling time with optimal over- and undershoots during transients. The main task is to develop new and innovative digital PWM techniques in order to achieve: 1. Tight regulation at steady-state: by proposing high resolution DPWM architecture,based on Digital Clock Management (DCM) resources available on FPGA boards. The proposed architecture Window-Masked Segmented Digital Clock Manager-FPGA based Digital Pulse Width Modulator Technique, is designed to achieve high resolution operating at high switching frequencies with minimum power consumption. 2. Enhanced dynamic response: by applying a shift to the basic saw-tooth DPWM signal, in order to benefit from the best linearity and simplest architecture offered by the conventional counter-comparator DPWM. This proposed control scheme will help the compensator reach the steady-state value faster. Dynamically Shifted Ramp Digital Control Technique for Improved Transient Response in DC-DC Converters, is projected to enhance the transient response by dynamically controlling the ramp signal of the DPWM unit.
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Date Issued: 2010
Identifier: CFE0003055, ucf:48314
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003055

Title: FAST ALGORITHMS FOR FRAGMENT BASED COMPLETION IN IMAGES OF NATURAL SCENES.
Creator: Borikar, Siddharth Rajkumar, Pattanaik, Dr.Sumanta, University of Central Florida
Abstract / Description: Textures are used widely in computer graphics to represent fine visual details and produce realistic looking images. Often it is necessary to remove some foreground object from the scene. Removal of the portion creates one or more holes in the texture image. These holes need to be filled to complete the image. Various methods like clone brush strokes and compositing processes are used to carry out this completion. User skill is required in such methods. Texture synthesis can also be used to...
Show moreTextures are used widely in computer graphics to represent fine visual details and produce realistic looking images. Often it is necessary to remove some foreground object from the scene. Removal of the portion creates one or more holes in the texture image. These holes need to be filled to complete the image. Various methods like clone brush strokes and compositing processes are used to carry out this completion. User skill is required in such methods. Texture synthesis can also be used to complete regions where the texture is stationary or structured. Reconstructing methods can be used to fill in large-scale missing regions by interpolation. Inpainting is suitable for relatively small, smooth and non-textured regions. A number of other approaches focus on the edge and contour completion aspect of the problem. In this thesis we present a novel approach for addressing this image completion problem.Our approach focuses on image based completion, with no knowledge of the underlying scene. In natural images there is a strong horizontal orientation of texture/color distribution. We exploit this fact in our proposed algorithm to fill in missing regions from natural images. We follow the principle of figural familiarity and use the image as our training set to complete the image.
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Date Issued: 2004
Identifier: CFE0000053, ucf:46078
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000053

Title: ANALYSIS AND DESIGN OF A MODULAR SOLAR-FED FAULT-TOLERANT POWER SYSTEM WITH MAXIMUM POWER POINT TRACKING.
Creator: Al-Atrash, Hussam, Batarseh, Issa, University of Central Florida
Abstract / Description: Solar power is becoming ever more popular in a variety of applications. It is particularly attractive because of its abundance, renewability, and environment friendliness. Solar powered spacecraft systems have ever-expanding loads with stringent power regulation specifications. Moreover, they require a light and compact design of their power system. These constraints make the optimization of power harvest from solar arrays a critical task. Florida Power Electronics Center (FPEC) at UCF set to...
Show moreSolar power is becoming ever more popular in a variety of applications. It is particularly attractive because of its abundance, renewability, and environment friendliness. Solar powered spacecraft systems have ever-expanding loads with stringent power regulation specifications. Moreover, they require a light and compact design of their power system. These constraints make the optimization of power harvest from solar arrays a critical task. Florida Power Electronics Center (FPEC) at UCF set to develop a modular fault-tolerant power system architecture for space applications. This architecture provides a number of very attractive features including Maximum Power Point Tracking (MPPT) and uniform power stress distribution across the system. MPPT is a control technique that leads the system to operate its solar sources at the point where they provide maximum power. This point constantly moves following changes in ambient operating conditions. A digital controller is setup to locate it in real time while optimizing other operating parameters. This control scheme can increase the energy yield of the system by up to 45%, and thus significantly reduces the size and weight of the designed system. The modularity of the system makes it easy to prototype and expand. It boosts its reliability and allows on-line reconfiguration and maintenance, thus reducing down-time upon faults. This thesis targets the analysis and optimization of this architecture. A new modeling technique is introduced for MPPT in practical environments, and a novel digital power stress distribution scheme is proposed in order to properly distribute peak and thermal stress and improve reliability. A 2kW four-channel prototype of the system was built and tested. Experimental results confirm the theoretical improvements, and promise great success in the field.
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Date Issued: 2005
Identifier: CFE0000469, ucf:46357
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000469

Title: VIRTUALLY ABSTRACT.
Creator: Kappers, Michael, Haxton, David, University of Central Florida
Abstract / Description: My most recent body of work frees me from traditional animation and graphic design principles that had become second nature in my creative practice over years of commercial work in industry. I now find myself unconsciously creating shape and form without a preconceived vision of the final outcome. This allows for a free-flowing approach to my canvas. The canvas in which my forms are created is virtual space and can be described as an infinite cube. The first step I take in each of my pieces...
Show moreMy most recent body of work frees me from traditional animation and graphic design principles that had become second nature in my creative practice over years of commercial work in industry. I now find myself unconsciously creating shape and form without a preconceived vision of the final outcome. This allows for a free-flowing approach to my canvas. The canvas in which my forms are created is virtual space and can be described as an infinite cube. The first step I take in each of my pieces is creating a cube with the center residing at Cartesian coordinates 0,0,0. From there, I make the decision either to subdivide the cube into sections or extrude faces from the cube. In either case, I begin to see the possibilities in which the form can take. Some forms are organic and rhythmic while others become machined and rigid. At this stage, color and light are not a part of the equation.
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Date Issued: 2008
Identifier: CFE0002086, ucf:47584
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002086

Title: PITIFUL CREATURES.
Creator: Wightman, Shaun, Hall, Scott, University of Central Florida
Abstract / Description: By focusing on character, humor, and loose narrative, I create a world full of quirky, pitiful creatures that blur the lines between illustration and "Fine Art". Inspired by golden age cartoons, Pop-Surrealism, and late 50's commercial art, I make work that speaks of the awkwardness of human emotion while keeping a "tongue in cheek" attitude about everyday life. This work is expressed through illustration, animation, sculpture, and a lot of sarcasm.
Date Issued: 2008
Identifier: CFE0002115, ucf:47556
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002115

Title: MODELING AND DIGITAL CONTROL OF HIGH FREQUENCY DC-DC POWER CONVERTERS.
Creator: Wen, Yangyang, Batarseh, Issa, University of Central Florida
Abstract / Description: The power requirements for leading edge digital integrated circuits have become increasingly demanding. Power converter systems must be faster, more flexible, more precisely controllable and easily monitored. Meanwhile, in addition to control process, the new functions such as power sequencing, communication with other systems, voltage dynamic programming,load line specifications, phase current balance, protection, power status monitoring and system diagnosis are going into today's power...
Show moreThe power requirements for leading edge digital integrated circuits have become increasingly demanding. Power converter systems must be faster, more flexible, more precisely controllable and easily monitored. Meanwhile, in addition to control process, the new functions such as power sequencing, communication with other systems, voltage dynamic programming,load line specifications, phase current balance, protection, power status monitoring and system diagnosis are going into today's power supply systems. Digital controllers, compared withanalog controllers, are in a favorable position to provide basic feedback control as well as those power management functions with lower cost and great flexibility. The dissertation gives an overview of digital controlled power supply systems bycomparing with conventional analog controlled power systems in term of system architecture,modeling methods, and design approaches. In addition, digital power management, as one of the most valuable and "cheap" function, is introduced in Chapter 2. Based on a leading-edge digital controller product, Chapter 3 focuses on digital PID compensator design methodologies, design issues, and optimization and development of digital controlled single-phase point-of-load (POL)dc-dc converter. Nonlinear control is another valuable advantage of digital controllers over analogcontrollers. Based on the modeling of an isolated half-bridge dc-dc converter, a nonlinear control method is proposed in Chapter 4. Nonlinear adaptive PID compensation scheme is implemented based on digital controller Si8250. The variable PID coefficient during transients improves power system's transient response and thus output capacitance can be reduced to save cost. In Chapter 5, another nonlinear compensation algorithm is proposed for asymmetric flybackforward half bridge dc-dc converter to reduce the system loop gain's dependence on the input voltage, and improve the system's dynamic response at high input line. In Chapter 6, a unified pulse width modulation (PWM) scheme is proposed to extend the duty-cycle-shift (DCS) control, where PWM pattern is adaptively generated according to the input voltage level, such that the power converter's voltage stress are reduced and efficiency is improved. With the great flexibility of digital PWM modulation offered by the digital controller Si8250, the proposed control scheme is implemented and verified. Conclusion of the dissertation work and suggestions for future work in related directions are given in final Chapter.
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Date Issued: 2007
Identifier: CFE0001612, ucf:47172
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001612

Title: NEW OPTIMAL HIGH EFFICIENCY DSP-BASED DIGITAL CONTROLLER DESIGN FOR SUPER HIGH-SPEED PERMANENT MAGNET SYNCHRONOUS MOTOR.
Creator: zhao, limei, Wu, Thomas, University of Central Florida
Abstract / Description: This dissertation investigates digital controller and switch mode power supply design for super high-speed permanent magnet synchronous motors (PMSM). The PMSMs are a key component for the miniaturic cryocooler that is currently under development at the University of Central Florida with support from NASA Kennedy Space Center and the Florida Solar Energy Center. Advanced motor design methods, control strategies, and rapid progress in semiconductor technology enables production of a highly...
Show moreThis dissertation investigates digital controller and switch mode power supply design for super high-speed permanent magnet synchronous motors (PMSM). The PMSMs are a key component for the miniaturic cryocooler that is currently under development at the University of Central Florida with support from NASA Kennedy Space Center and the Florida Solar Energy Center. Advanced motor design methods, control strategies, and rapid progress in semiconductor technology enables production of a highly efficient digital controller. However, there are still challenges for such super high-speed controller design because of its stability, high-speed, variable speed operation, and required efficiency over a wide speed range. Currently, limited research, and no commercial experimental analysis, is available concerning such motors and their control system design. The stability of a super high-speed PMSM is an important issue particularly for open-loop control, given that PMSM are unstable after exceeding a certain applied frequency. In this dissertation, the stability of super high-speed PMSM is analyzed and some design suggestions are given to maximize this parameter. For ordinary motors, the V/f control curve is a straight line with a boost voltage because the stator resistance is negligible and only has a significant effect around the DC frequency. However, for the proposed super high-speed PMSM the situation is quite different because of the motor's size. The stator resistance is quite large compared with the stator reactive impedance and cannot be neglected when employing constant a V/f control method. The challenge is to design an optimal constant V/f control scheme to raise efficiency with constant V/f control. In the development, test systems and prototype boards were built and experimental results confirmed the effectiveness of the dissertation system.
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Date Issued: 2005
Identifier: CFE0000856, ucf:46651
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000856

Title: DIGITAL CONTROLLER IMPLEMENTATION FOR DISTURBANCE REJECTION IN THE OPTICAL COUPLING OF A MOBILE EXPERIMENTAL LASER TRACKING SYSTEM.
Creator: Rhodes, Matthew, Richie, Samuel, University of Central Florida
Abstract / Description: Laser tracking systems are an important aspect of the NASA space program, in particular for conducting research in relation to satellites and space port launch vehicles. Often, launches are conducted at remote sites which require all of the test equipment, including the laser tracking systems, to be portable. Portable systems are more susceptible to environmental disturbances which affect the overall tracking resolution, and consequently, the resolution of any other experimental data being...
Show moreLaser tracking systems are an important aspect of the NASA space program, in particular for conducting research in relation to satellites and space port launch vehicles. Often, launches are conducted at remote sites which require all of the test equipment, including the laser tracking systems, to be portable. Portable systems are more susceptible to environmental disturbances which affect the overall tracking resolution, and consequently, the resolution of any other experimental data being collected at any given time. This research characterizes the optical coupling between two systems in a Mobile Experimental Laser Tracking system and evaluates several control solutions to minimize disturbances within this coupling. A simulation of the optical path was developed in an extensible manner such that different control systems could be easily implemented. For an initial test, several PID controllers were utilized in parallel in order to control mirrors in the optical coupling. Despite many limiting factors of the hardware, a simple proportional control performed to expectations. Although a system implementation was never field tested, the simulation results provide the necessary insight to develop the system further. Recommendations were made for future system modifications which would allow an even higher tracking resolution.
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Date Issued: 2006
Identifier: CFE0001168, ucf:46873
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001168

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