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Pages
- Title
- DESIGN: FEEL IT, SEE IT, SPEAK IT, DO IT...
- Creator
-
Yates, Sarah, Wood, Mary V., University of Central Florida
- Abstract / Description
-
Description of Project: This project explores the design process for Tales of a Fourth Grade Nothing by Judy Blume (adapted for the stage by Bruce Mason) as performed at Orlando Repertory Theatre in Orlando, Florida. In this exploration, I approach the topics of the design process from conceptual discussions with the design team through closing night. I document this process with a lighting design journal (including thoughts about the design approach, renderings, sketches, research images,...
Show moreDescription of Project: This project explores the design process for Tales of a Fourth Grade Nothing by Judy Blume (adapted for the stage by Bruce Mason) as performed at Orlando Repertory Theatre in Orlando, Florida. In this exploration, I approach the topics of the design process from conceptual discussions with the design team through closing night. I document this process with a lighting design journal (including thoughts about the design approach, renderings, sketches, research images, rough plots and paperwork.) The project concludes with a self evaluation, completed plots and paperwork, and finished production photos.
Show less - Date Issued
- 2007
- Identifier
- CFE0001646, ucf:47238
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001646
- Title
- A LIGHTING AND SCENIC DESIGN FOR THE UNIVERSITY OF CENTRAL FLORIDAÂÂ'SA SYMPHONY OF DANCE.
- Creator
-
Baldwin, Terra, Scott, Hubert, University of Central Florida
- Abstract / Description
-
ABSTRACT The beginnings of modern stage lighting emerged during the late 1800s when Adolphe Appia and Edward Gordon Craig theorized about the potential use of lighting to create plasticity in a theatrical production. Appia and Craig conducted experiments, only to find that the limitation of the instruments available at the time prevented the achievement of their theory. The next documented step was when Stanley McCandless proposed and published a system for implementing the Appia and Craig...
Show moreABSTRACT The beginnings of modern stage lighting emerged during the late 1800s when Adolphe Appia and Edward Gordon Craig theorized about the potential use of lighting to create plasticity in a theatrical production. Appia and Craig conducted experiments, only to find that the limitation of the instruments available at the time prevented the achievement of their theory. The next documented step was when Stanley McCandless proposed and published a system for implementing the Appia and Craig theory of plasticity. Stanley McCandlessÂÂ' lighting textbook, A Syllabus of Stage Lighting. The book broke down the elements and function of light; ultimately becoming the common practice of academic lighting designers. One of his students, Jean Rosenthal, studied the theory and became aware of its limitations. Jean Rosenthal attempted to apply the McCandless theory to dance and found that it was not useful for sculpting the body. She then developed a new technique that better served dance lighting and adhered to the ideas of Appia and Craig. RosenthalÂÂ's theory became the foundation of contemporary dance lighting practice. The aim of this thesis consists of four parts. First is to research the evolution of dance lighting, second is to explore and apply the Rosenthal Theory of Dance Lighting, third is to document the design process and the fourth part is the personal growth and development throughout this entire process. As the Lighting and Scenic Designer I will have extensive documentation of both the process of design and the production. I will also have documentation on my growth and development based on this thesis project.
Show less - Date Issued
- 2010
- Identifier
- CFE0003282, ucf:48530
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003282
- Title
- Inverse Problems in Multiple Light Scattering.
- Creator
-
Broky, John, Dogariu, Aristide, Christodoulides, Demetrios, Wu, Shintson, Tamasan, Alexandru, University of Central Florida
- Abstract / Description
-
The interaction between coherent waves and material systems with complex optical properties is a complicated, deterministic process. Light that scatters from such media gives rise to random fields with intricate properties. It is common perception that the randomness of these complex fields is undesired and therefore is to be removed, usually through a process of ensemble averaging. However, random fields emerging from light matter interaction contain information about the properties of the...
Show moreThe interaction between coherent waves and material systems with complex optical properties is a complicated, deterministic process. Light that scatters from such media gives rise to random fields with intricate properties. It is common perception that the randomness of these complex fields is undesired and therefore is to be removed, usually through a process of ensemble averaging. However, random fields emerging from light matter interaction contain information about the properties of the medium and a thorough analysis of the scattered light allows solving specific inverse problems. Traditional attempts to solve these kinds of inverse problems tend to rely on statistical average quantities and ignore the deterministic interaction between the optical field and the scattering structure. Thus, because ensemble averaging inherently destroys specific characteristics of random processes, one can only recover limited information about the medium. This dissertation discusses practical means that go beyond ensemble averaging to probe complex media and extract additional information about a random scattering system. The dissertation discusses cases in which media with similar average properties can be differentiated by detailed examination of fluctuations between different realizations of the random process of multiple scattering. As a different approach to this type of inverse problems, the dissertation also includes a description of how higher-order field and polarization correlations can be used to extract features of random media and complex systems from one single realization of the light-matter interaction. Examples include (i) determining the level of multiple scattering, (ii) identifying non-stationarities in random fields, and (iii) extracting underlying correlation lengths of random electromagnetic fields that result from basic interferences. The new approaches introduced and the demonstrations described in this dissertation represent practical means to extract important material properties or to discriminate between media with similar characteristics even in situations when experimental constraints limit the number of realizations of the complex light-matter interaction.
Show less - Date Issued
- 2012
- Identifier
- CFE0004656, ucf:49888
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004656
- Title
- MIKADO LIGHTING DESIGN.
- Creator
-
Becker, Adrienne M, Hart, Jim, University of Central Florida
- Abstract / Description
-
My thesis will encompass the completion of the lighting design for W. S. Gilbert and Sir Arthur Sullivan's opera The Mikado and a post-production written documentation of the entire production process. The thesis will involve the completion of a lighting design with all of its accompanying paperwork. The design will require lights for a two-act, multi-locational musical. The entire design process will involve close communication with the design team, the director, and the shop crew. The...
Show moreMy thesis will encompass the completion of the lighting design for W. S. Gilbert and Sir Arthur Sullivan's opera The Mikado and a post-production written documentation of the entire production process. The thesis will involve the completion of a lighting design with all of its accompanying paperwork. The design will require lights for a two-act, multi-locational musical. The entire design process will involve close communication with the design team, the director, and the shop crew. The written portion of the Thesis will document the design process from early concept discussions through the completion and opening of the show. The thesis will examine the artistic developments and growth, as well as reflect on the overall success and development of the design. The personal journals maintained throughout the process will provide insight into the working relationship and nature of my collaboration with all the departments.
Show less - Date Issued
- 2004
- Identifier
- CFE0000083, ucf:46102
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000083
- Title
- POLARIMETRIC CHARACTERIZATION OF RANDOM ELECTROMAGNETIC BEAMS AND APPLICATIONS.
- Creator
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Mujat, Mircea, Dogariu, Aristide, University of Central Florida
- Abstract / Description
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The polarimetric properties of random electromagnetic beams provide new means for characterizing random media. A novel interferometric technique is introduced for controlling the polarimetric, spectral, and coherence characteristics of random electromagnetic beams. Several new techniques are presented for measuring the state of polarization and the polarization transfer through scattering media. The polarimetric signatures of different particulate systems are related to their structural...
Show moreThe polarimetric properties of random electromagnetic beams provide new means for characterizing random media. A novel interferometric technique is introduced for controlling the polarimetric, spectral, and coherence characteristics of random electromagnetic beams. Several new techniques are presented for measuring the state of polarization and the polarization transfer through scattering media. The polarimetric signatures of different particulate systems are related to their structural properties and to the size distribution, shape, orientation, birefringent or dichroic properties of the particles. Various scattering regimes and different geometries are discussed for applications relevant to the bio-medical field, material science, and remote sensing.
Show less - Date Issued
- 2004
- Identifier
- CFE0000049, ucf:46132
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000049
- Title
- THE BREVARD CHRONICLES: SHORT STORIES.
- Creator
-
Dull, Joshua, Rodriguez Milanes, Cecilia, University of Central Florida
- Abstract / Description
-
America has a long history of making promises it cannot keep, the most accessible buzz word for such promises being, "the American Dream", where everyone will enjoy some level of affluence and assimilate into the proverbial "melting pot" so long as they work hard and follow predetermined rules set by the power structure. In this model American lifestyle, the spiritual essence of humans is buried by the materialistic drive of capitalism, which drives us farther apart and alienates us from our...
Show moreAmerica has a long history of making promises it cannot keep, the most accessible buzz word for such promises being, "the American Dream", where everyone will enjoy some level of affluence and assimilate into the proverbial "melting pot" so long as they work hard and follow predetermined rules set by the power structure. In this model American lifestyle, the spiritual essence of humans is buried by the materialistic drive of capitalism, which drives us farther apart and alienates us from our neighbors. Yet in the mid 2000s, in the aftermath of some of the country's worst disasters, this power structure began to crumble. As with any transition, those with stake in the power structure suffered, which was virtually everyone in America at the time. Yet regardless of what they suffered, they found themselves still alive, still breathing. This proved something existed beyond the American dream, something more spiritual and intangible.The aim of these stories is to explore the lives of those left in the wake of the initial post-9/11 economic collapse of Brevard County. Dubbed the "Space Coast," it stood as a pinnacle for the lofty promises of the American dream and a staple of its subsequent collapse. The following stories render this time and place, populated not only by those who lost something during the economic failure, but the young people who had been promised a bright future and watched it ebb away before their eyes.
Show less - Date Issued
- 2015
- Identifier
- CFH0004886, ucf:45428
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004886
- Title
- CHARACTERISTICS OF RED LIGHT RUNNING CRASHESIN FLORIDA.
- Creator
-
Elnashar, Dina, Radwan, Essam, University of Central Florida
- Abstract / Description
-
Red light running is one of the main contributing factors of crashes in urban areas in Florida and the United States. Nationwide, according to preliminary estimates by the Federal Highway Administration (FHWA) 2001, there were nearly 218,000 red-light running crashes at intersections. These crashes resulted in as many as 181,000 injuries and 880 fatalities, and an economic loss estimated at $14 billion per year nationwide, According to the Community Traffic Safety Team Florida Coalition (A...
Show moreRed light running is one of the main contributing factors of crashes in urban areas in Florida and the United States. Nationwide, according to preliminary estimates by the Federal Highway Administration (FHWA) 2001, there were nearly 218,000 red-light running crashes at intersections. These crashes resulted in as many as 181,000 injuries and 880 fatalities, and an economic loss estimated at $14 billion per year nationwide, According to the Community Traffic Safety Team Florida Coalition (A statewide traffic safety group) there were 9,348 crashes involving red-light running in Florida and 127 fatalities in 1999. This research study focused on studying the red light running crashes and violations in the State of Florida. There were three primary objectives for this research. The first primary objective was to analyze the red light running crashes in Florida from 2002 to 2004. The data for this part was collected from the Crash Analysis Reporting System of the Florida Department of Transportation. These crashes are reported as "disregarded traffic signal" as far as the first contributing cause. The analysis focused on the influences of different factors on red light running crashes including the driver (age group, gender, and DUI history) and the environment (time of day, day of week, type of road, and weather). However, not all red light crashes are reported as "disregarded traffic signal". Therefore, representing red light running crashes only through "disregard traffic signal" noted reports would underestimate the extent of red light running effects at a given intersection. Therefore, the second objective was to review the long form crash reports to determine the actual number of crashes related to red light running. The analysis for a random sample of the crashes on the sate roads of Florida on the year 2004 showed that the percentage of crashes related to red light running reported on the database was found to be (3.13%), and the percentage of crashes related to red light running reported in the original crash repot filled by the police officer are much higher than reported(5.63%), which shows the importance of standardizing the format and coding process for the long form crashes conducted by the police officers to help accurately identify the real cause of the crash at the studied location. The third objective was to analyze the violations data given for five intersections and find if there is a correlation between the average rate of violations per hour and the frequency of red light running crashes. The analysis showed that utilizing the limited number of intersections used in the study, it appears that there is no correlation between the average violations per hour and the red light running crashes at the studied locations.
Show less - Date Issued
- 2008
- Identifier
- CFE0002230, ucf:47920
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002230
- Title
- Resource Optimization in Visible Light Communication using Internet of Things.
- Creator
-
Dey, Akash, Yuksel, Murat, Pourmohammadi Fallah, Yaser, Rahnavard, Nazanin, University of Central Florida
- Abstract / Description
-
In the modern day, there is a serious spectrum crunch in the legacy radio frequency (RF) band, for which visible light communication (VLC) can be a promising option. VLC is a short-range wireless communication variant which uses the visible light spectrum. In this thesis, we are using a VLC-based architecture for providing scalable communications to Internet-of-Things (IoT) devices where a multi-element hemispherical bulb is used that can transmit data streams from multiple light emitting...
Show moreIn the modern day, there is a serious spectrum crunch in the legacy radio frequency (RF) band, for which visible light communication (VLC) can be a promising option. VLC is a short-range wireless communication variant which uses the visible light spectrum. In this thesis, we are using a VLC-based architecture for providing scalable communications to Internet-of-Things (IoT) devices where a multi-element hemispherical bulb is used that can transmit data streams from multiple light emitting diode (LED) boards. The essence of this architecture is that it uses a Line-of-Sight (LoS) alignment protocol that handles the hand-off issue created by the movement of receivers inside a room.We start by proposing an optimization problem aiming to minimize the total consumed energy emitted by each LED taking into consideration the LEDs' power budget, users' perceived quality-of-service, LED-user associations, and illumination uniformity constraints. Then, because of the non-convexity of the problem, we propose to solve it in two stages: (1) We design an efficient algorithm for LED-user association for fixed LED powers, and (2) using the LED-user association, we find an approximate solution based on Taylor series to optimize the LEDs' power. We devise two heuristic solutions based on this approach. The first heuristic solution, called the Low Complexity Two Stages Solution (TSS), optimizes the association between the LEDs and the mobile users before and then the power of each LED is optimized. In the second heuristic, named the Maximum Uniformity Approach, we try to improve the illumination uniformity first and then adjust the power values for each LED so that they do not go above a certain value. Finally, we illustrate the performance of our method via simulations.
Show less - Date Issued
- 2019
- Identifier
- CFE0007451, ucf:52693
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007451
- Title
- Joint Optimization of Illumination and Communication for a Multi-Element VLC Architecture.
- Creator
-
Ibne Mushfique, Sifat, Yuksel, Murat, Pourmohammadi Fallah, Yaser, Turgut, Damla, University of Central Florida
- Abstract / Description
-
Because of the ever increasing demand wireless data in the modern era, the Radio Frequency (RF) spectrum is becoming more congested. The remaining RF spectrum is being shrunk at a very heavy rate, and spectral management is becoming more difficult. Mobile data is estimated to grow more than 10 times between 2013 and 2019, and due to this explosion in data usage, mobile operators are having serious concerns focusing on public Wireless Fidelity (Wi-Fi) and other alternative technologies....
Show moreBecause of the ever increasing demand wireless data in the modern era, the Radio Frequency (RF) spectrum is becoming more congested. The remaining RF spectrum is being shrunk at a very heavy rate, and spectral management is becoming more difficult. Mobile data is estimated to grow more than 10 times between 2013 and 2019, and due to this explosion in data usage, mobile operators are having serious concerns focusing on public Wireless Fidelity (Wi-Fi) and other alternative technologies. Visible Light Communication (VLC) is a recent promising technology complementary to RF spectrum which operates at the visible light spectrum band (roughly 400 THz to 780 THz) and it has 10,000 times bigger size than radio waves (roughly 3 kHz to 300 GHz). Due to this tremendous potential, VLC has captured a lot of interest recently as there is already an extensive deployment of energy efficient Light Emitting Diodes (LEDs). The advancements in LED technology with fast nanosecond switching times is also very encouraging. In this work, we present hybrid RF/VLC architecture which is capable of providing simultaneous lighting and communication coverage in an indoor setting. The architecture consists of a multi-element hemispherical bulb design, where it is possible to transmit multiple data streams from the multi-element hemispherical bulb using LED modules. We present the detailed components of the architecture and make simulations considering various VLC transmitter configurations. Also, we devise an approach for an efficient bulb design mechanism to maintain both illumination and communication at a satisfactory rate, and analyze it in the case of two users in a room. The approach involves formulating an optimization problem and tackling the problem using a simple partitioning algorithm. The results indicate that good link quality and high spatial reuse can be maintained in a typical indoor communication setting.
Show less - Date Issued
- 2018
- Identifier
- CFE0007016, ucf:52025
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007016
- Title
- High Performance Liquid Crystals for Displays and Spatial Light Modulators.
- Creator
-
Peng, Fenglin, Wu, Shintson, Moharam, Jim, Zeldovich, Boris, Fang, Jiyu, University of Central Florida
- Abstract / Description
-
Liquid crystals (LCs) are an amazing class of soft materials which have been widely used in the visible, infrared (IR), millimeter wave, and terahertz spectral regions. Both amplitude modulation (e.g. displays) and phase modulation (e.g. spatial light modulators (SLMs) for adaptive optics and adaptive lens) have been investigated extensively. Thin-film-transistor liquid crystal displays (TFT-LCDs) have become ubiquitous in our daily lives. Its widespread applications span from TVs, monitors,...
Show moreLiquid crystals (LCs) are an amazing class of soft materials which have been widely used in the visible, infrared (IR), millimeter wave, and terahertz spectral regions. Both amplitude modulation (e.g. displays) and phase modulation (e.g. spatial light modulators (SLMs) for adaptive optics and adaptive lens) have been investigated extensively. Thin-film-transistor liquid crystal displays (TFT-LCDs) have become ubiquitous in our daily lives. Its widespread applications span from TVs, monitors, tablets, smartphones, augmented reality, virtual reality, to vehicle displays. LCD shows advantages in 1) high resolution, 2) long lifetime, 3) vivid colors using quantum dots backlight, and 4) high dynamic contrast ratio employing local dimming technology. However, LCD exhibits a serious problem, which is slow response time. Therefore, it is commonly perceived that LCD exhibits a more severe image blur than organic light emitting diode (OLED) displays. Indeed, the response time of LCD is ~100x slower than that of OLED. To evaluate image blurs, Motion Picture Response Time (MPRT) has been proposed to quantify the visual performance of a moving object. MPRT is jointly governed by three factors: the sample and hold effect of an active matrix display, motion pursuing, and human vision system. It is a complicated problem and is difficult to obtain analytical solution. In this thesis, we analyze the sample-and-hold effects and derive a simple equation to correlate MPRT with LC response time, TFT frame rate, and duty ratio. From our analytical equation, we find that as long as an LCD's response time is less than 2 ms, its MPRT would be comparable to that of OLED at the same frame rate, even if the OLED's response time is assumed to be zero. To further reduce MPRT, we could boost the frame rate to 144 Hz or reduce the duty ratio through backlight modulation. This discovery sheds new physical insights for LCDs to achieve CRT-like displays with negligible image blurs. In addition to displays, LCs are widely employed in SLMs for modulating the phase and polarization of an incident light. This is because LCs possess high birefringence and relatively low absorption from the visible, IR, to terahertz regions. The useful applications include adaptive lens, adaptive optics, fiber-optic communication, antenna, and phase shifter. Fast response time is a common requirement for the abovementioned photonic devices. To achieve fast response time while maintaining 2-pi phase change, polymer-stabilized blue phase liquid crystal (BPLC) and polymer-network liquid crystal (PNLC) are promising candidates for the visible and IR SLMs, respectively. However, the operation voltage of present BPLC and PNLC devices is too high. To reduce operation voltage while keeping fast response time, we developed a new device configuration for BPLC SLM to work in the visible region. The new device structure allows the incident laser beam to traverse the BPLC layer four times before exiting the reflective SLM. As a result, the 2-pi phase change voltage is reduced to below 24V, which is the maximum attainable voltage for a high resolution liquid-crystal-on-silicon device. On the other hand, PNLC is a better candidate for the IR SLM because several high birefringence LC materials can be used. To reduce the operation voltage of a PNLC, we have investigated following three approaches: 1) developing large dielectric anisotropy and high birefringence (?n) LC materials, 2) optimizing polymer concentration, and 3) optimizing UV curing conditions. In the visible and near IR regions, most LCs are highly transparent. However, to extend the electro-optic application of LCs into MWIR and LWIR, absorption loss becomes a critical issue. In the MWIR region, several fundamental molecular vibration bands and overtones exist, which contribute to high absorption loss. The absorbed light turns to heat and then alters the birefringence locally, which in turns causes spatially non-uniform phase modulation. To suppress the optical loss, we have taken following approaches: (1) Designing high birefringence to minimize the LC layer thickness; (2) Shifting the absorption bands outside the spectral region of interest by deuteration, fluorination, or chlorination; (3) Reducing the overtone absorption by using a short alkyl chain. As a result, we have developed several low loss and high birefringence chlorinated LCs for the first time. To achieve fast response time, we demonstrated a PNLC with 2-pi phase change at MWIR and response time less than 5 ms. Molecular tailoring strategies for extending liquid crystal SLM into long-wavelength infrared (LWIR) are also explored.
Show less - Date Issued
- 2017
- Identifier
- CFE0006636, ucf:51230
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006636
- Title
- MOTORCYCLE CONSPICUITY: THE EFFECTS OF AGE AND VEHICULAR DAYTIME RUNNING LIGHTS.
- Creator
-
Torrez, Lorenzo, Smither, Janan, University of Central Florida
- Abstract / Description
-
Research has shown that riding a motorcycle can potentially be much more dangerous than operating a conventional vehicle. There are factors inherent in driving or riding a small two wheeled vehicle, such as a motorcycle, moped or even bicycle that can potentially decrease their ability to be seen or noticed by other drivers. This disadvantage is reflected in the disproportionate over-representation of injuries and/or fatalities incurred by this particular driving group. This creates a...
Show moreResearch has shown that riding a motorcycle can potentially be much more dangerous than operating a conventional vehicle. There are factors inherent in driving or riding a small two wheeled vehicle, such as a motorcycle, moped or even bicycle that can potentially decrease their ability to be seen or noticed by other drivers. This disadvantage is reflected in the disproportionate over-representation of injuries and/or fatalities incurred by this particular driving group. This creates a significant problem which deserves dedicated evaluation as to causative factors and/or influential variables. The following research was conducted with intentions to investigate the topic of motorcycle conspicuity so as to further explain the variables which positively contribute to a motorcycle being seen and to supplement the body of knowledge that currently exists on this topic. This study specifically evaluated the influence of sex, age, motorcycle lighting conditions, and vehicular daytime running lights upon one's ability to effectively detect a motorcycle within a "high fidelity" simulated environment. This research additionally sought to examine the feasibility and validity of using a novel fixed base "high fidelity" simulator for the evaluation of motorcycle conspicuity. The results from this research clearly indicate a link between vehicular DRLs and the effective detection of motorcycles and also support previous research as to the effectiveness of motorcycle DRLs. Additionally, these results suggest that as one ages, certain degradations in vision, cognition, and physiology occur which decrease one's performance in detecting and responding to a motorcycle. These findings additionally provide support for the use of a "high definition" fixed base simulator as a valid technology for the evaluation of motorcycle conspicuity.
Show less - Date Issued
- 2008
- Identifier
- CFE0002016, ucf:47614
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002016
- Title
- REAL-TIME REALISTIC RENDERING OF NATURE SCENES WITH DYNAMIC LIGHTING.
- Creator
-
Boulanger, Kevin, Pattanaik, Sumanta, University of Central Florida
- Abstract / Description
-
Rendering of natural scenes has interested the scientific community for a long time due to its numerous applications. The targeted goal is to create images that are similar to what a viewer can see in real life with his/her eyes. The main obstacle is complexity: nature scenes from real life contain a huge number of small details that are hard to model, take a lot of time to render and require a huge amount of memory unavailable in current computers. This complexity mainly comes from geometry...
Show moreRendering of natural scenes has interested the scientific community for a long time due to its numerous applications. The targeted goal is to create images that are similar to what a viewer can see in real life with his/her eyes. The main obstacle is complexity: nature scenes from real life contain a huge number of small details that are hard to model, take a lot of time to render and require a huge amount of memory unavailable in current computers. This complexity mainly comes from geometry and lighting. The goal of our research is to overcome this complexity and to achieve real-time rendering of nature scenes while providing visually convincing dynamic global illumination. Our work focuses on grass and trees as they are commonly visible in everyday life. We handle geometry and lighting complexities for grass to render millions of grass blades interactively with dynamic lighting. As for lighting complexity, we address real-time rendering of trees by proposing a lighting model that handles indirect lighting. Our work makes extensive use of the current generation of Graphics Processing Units (GPUs) to meet the real-time requirement and to leave the CPU free to carry out other tasks.
Show less - Date Issued
- 2008
- Identifier
- CFE0002262, ucf:47868
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002262
- Title
- Nanoplasmonics In Two-dimensional Dirac and Three-dimensional Metallic Nanostructure Systems.
- Creator
-
Safaei, Alireza, Chanda, Debashis, Leuenberger, Michael, Mucciolo, Eduardo, Tetard, Laurene, Zhai, Lei, University of Central Florida
- Abstract / Description
-
Surface plasmons are collective oscillation of electrons which are coupled to the incident electric field. Excitation of surface plasmon is a route to engineer the behavior of light in nanometer length scale and amplifying the light-matter interaction. This interaction is an outcome of near-field enhancement close to the metal surface which leads to plasmon damping through radiative decay to outgoing photons and nonradiative decay inside and on the surface of the material to create an...
Show moreSurface plasmons are collective oscillation of electrons which are coupled to the incident electric field. Excitation of surface plasmon is a route to engineer the behavior of light in nanometer length scale and amplifying the light-matter interaction. This interaction is an outcome of near-field enhancement close to the metal surface which leads to plasmon damping through radiative decay to outgoing photons and nonradiative decay inside and on the surface of the material to create an electron-hole pair via interband or intraband Landau damping. Plasmonics in Dirac systems such as graphene show novel features due to massless electrons and holes around the Dirac cones. Linear band structure of Dirac materials in the low-momentum limit gives rise to the unprecedented optical and electrical properties. Electronical tunability of the plasmon resonance frequency through applying a gate voltage, highly confined electric field, and low plasmon damping are the other special propoerties of the Dirac plasmons. In this work, I will summarize the theoretical and experimental aspects of the electrostatical tunable systems made from monolayer graphene working in mid-infrared regime. I will demonstrate how a cavity-coupled nanopatterned graphene excites Dirac plasmons and enhances the light-matter interaction. The resonance frequency of the Dirac plasmons is tunable by applying a gate voltage. I will show how different gate-dielectrics, and the external conditions like the polarization and angle of incident light affect on the optical response of the nanostructure systems. I will then show the application of these nanodevices in infrared detection at room temperature by using plasmon-assisted hot carriers generation. An asymmetric nanopatterned graphene shows a high responsivity at room temperature which is unprecedented. At the end, I will demonstrate the properties of surface plasmons on 3D noble metals and its applications in light-funneling, photodetection, and light-focusing.
Show less - Date Issued
- 2019
- Identifier
- CFE0007904, ucf:52746
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007904
- Title
- DEEP WITHIN.
- Creator
-
Joseph, Caberbe, Haxton, David, University of Central Florida
- Abstract / Description
-
As a contemporary photographer, I focus most on light and color to bring out the uniqueness of my images. Photography is about lighting and I manipulate lights to raise questions in my viewers. Manipulating light is my way of being curious about how it may change mood physically and emotionally. Inspired by classical paintings, I have developed a body of photographs that can be admired by anyone. Although the main focus of my work is light and color, this body of work is also intended to...
Show moreAs a contemporary photographer, I focus most on light and color to bring out the uniqueness of my images. Photography is about lighting and I manipulate lights to raise questions in my viewers. Manipulating light is my way of being curious about how it may change mood physically and emotionally. Inspired by classical paintings, I have developed a body of photographs that can be admired by anyone. Although the main focus of my work is light and color, this body of work is also intended to empower those with little confidence in themselves and those who have been rejected, abused, or mistrusted.
Show less - Date Issued
- 2009
- Identifier
- CFE0002592, ucf:48286
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002592
- Title
- EXPERIMENTAL TECHNIQUES FOR NONLINEAR MATERIAL CHARACTERIZATION: A NONLINEAR SPECTROMETER USING A WHITE-LIGHT CONTINUUM Z-SCAN.
- Creator
-
Balu, Mihaela, Van Stryland, Eric, University of Central Florida
- Abstract / Description
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The main goal of this dissertation is to introduce and demonstrate a new method for the rapid determination of the nonlinear absorption spectra and the dispersion of the nonlinear refraction of optical materials in the visible and near IR spectral regions. However, conventional methods like, white-light continuum pump-probe and Z-scan techniques were used to measure the peak 2PA cross-sections for a number of commercially available photoinitiators. In the new method mentioned above, a high...
Show moreThe main goal of this dissertation is to introduce and demonstrate a new method for the rapid determination of the nonlinear absorption spectra and the dispersion of the nonlinear refraction of optical materials in the visible and near IR spectral regions. However, conventional methods like, white-light continuum pump-probe and Z-scan techniques were used to measure the peak 2PA cross-sections for a number of commercially available photoinitiators. In the new method mentioned above, a high energy, broadband femtosecond white-light continuum is used to replace the single wavelength source conventionally used in a Z-scan experiment. In a Z-scan experiment, the transmittance of a focused beam through a sample is monitored as the sample travels through the focus, in the Z direction, along the focused beam. Providing the sample exhibits nonlinear absorption and/or refraction, the detector monitors a change in transmittance and/or a change in the beam divergence (if the energy is partially collected through an aperture in front of the detector). Replacing the single wavelength source with a white-light continuum allows for a much faster way of measuring nonlinear absorption/refraction spectra. This could eliminate the need for using other tunable sources (e.g. Optical Parameter Generators/Amplifiers) for nonlinear measurements. These sources made nonlinear spectroscopy using Z-scan experiments a time consuming task. This new source/method allows for rapid and simultaneous measurement of the nonlinear absorption spectrum and the dispersion of the nonlinear refraction. We have confirmed the functionality of the continuum as a source for nonlinear optical characterization of materials by using it to perform Z-scans on the well characterized semiconductors ZnSe and ZnS and on solutions of organic dyes.
Show less - Date Issued
- 2006
- Identifier
- CFE0001241, ucf:46934
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001241
- Title
- RADIATION STUDIES OF THE TIN-DOPED MICROSCOPIC DROPLET LASER PLASMA LIGHT SOURCE SPECIFIC TO EUV LITHOGRAPHY.
- Creator
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Koay, Chiew-Seng, Richardson, Martin, University of Central Florida
- Abstract / Description
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Extreme ultraviolet lithography(EUVL) is being developed worldwide as the next generation technology to be inserted in ~ 2009 for the mass production of IC chips with feature sizes
Show moreExtreme ultraviolet lithography(EUVL) is being developed worldwide as the next generation technology to be inserted in ~ 2009 for the mass production of IC chips with feature sizes <35 nm. One major challenge to its implementation is the development of a 13.5 nm EUV source of radiation that meets the requirements of current roadmap designs of the source of illumination in commercial EUVL scanners. The light source must be debris-free, in a free-space environment with the imaging EUV optics that must provide sufficient, narrow spectral band EUV power to print 100 wafers/hr. To meet this need, extensive studies on emission from a laser plasma source utilizing tin-doped droplet target was conducted. Presented in this work, are the many optical techniques such as spectroscopy, radiometry, and imaging, that were employed to characterize and optimize emission from the laser plasma source State of the art EUV spectrographs were employed to observe the source's spectrum under various laser irradiation conditions. Comparing the experimental spectra to those from theory, has allowed the determination of the Sn ion stages responsible for emitting into the useful EUV bandwidth. Experimental results were compared to spectral simulations obtained using Collisional-Radiative Equilibrium (CRE) model, as well. Moreover, extensive measurements surveying source emission from 2 nm to 30 nm, which is the region of the electromagnetic spectrum defined as EUV, was accomplished. Absolutely calibrated metrology was employed with the Flying Circus instrument from which the source's conversion efficiency (CE)--from laser to the useful EUV energy--was characterized under various laser irradiation conditions. Hydrodynamic simulations of the plasma expansion together with the CRE model predicted the condition at which optimum conversion could be attained. The condition was demonstrated experimentally, with the highest CE to be slightly above 2%, which is the highest value among all EUV source contenders. In addition to laser intensity, the CE was found to depend on the laser wavelength. For better understanding, this observation is compared to results from simulations. Through a novel approach in imaging, the size of the plasma was characterized by recording images of the plasma within a narrow band, around 13.5 nm. The size, approximately 100 ìm, is safely within the etendue limit set by the optical elements in the EUV scanner. Finally, the notion of irradiating the target with multiple laser beams was explored for the possibility of improving the source's conversion efficiency.
Show less - Date Issued
- 2006
- Identifier
- CFE0000938, ucf:46733
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000938
- Title
- SAVAGE IN LIMBO: A STUDY IN LIGHTING DESIGN.
- Creator
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Haines, Kenneth, Perry, Charles, University of Central Florida
- Abstract / Description
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Designing the elements of a theatrical production is a unique and often experimental process. This process changes from show to show, and it can be difficult for a viewer to differentiate mistakes from design choices without a background in lighting. That is why it is important to take a look at the design process step by step. Two goals I strove for when designing Savage In Limbo were, how the director's concept blended with a design and if the integrity of the designer's vision was evident...
Show moreDesigning the elements of a theatrical production is a unique and often experimental process. This process changes from show to show, and it can be difficult for a viewer to differentiate mistakes from design choices without a background in lighting. That is why it is important to take a look at the design process step by step. Two goals I strove for when designing Savage In Limbo were, how the director's concept blended with a design and if the integrity of the designer's vision was evident on stage. To explore these goals, script analysis and consideration of the director's vision are two very important processes. Additionally, an exploration of the design process will better describe the growth and personal achievements of the design. This thesis will show the process of the lighting design for The University of Central Florida's 2011 production of John Patrick Shanley's Savage In Limbo. The project will highlight the design achievements and the goals explained previously, and create a formal dialogue on this specific design in order to provide insight into the process. When analyzing the design it was important that I assessed the process as well as the product by looking at whether the design met the expectations of the script and audience. This thesis will also explore how my past experiences, education and current skill level have prepared me for this design process in order to create a guideline for others interested in the development of knowledge needed for design.
Show less - Date Issued
- 2012
- Identifier
- CFH0004206, ucf:44969
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004206
- Title
- GOLD NANOPARTICLES: SYNTHESIS, PROPERTY STUDY AND APPLCICATIONS FORBIOMOLECULAR DETECTION AND PHOTOTHERMAL THERAPY.
- Creator
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liu, xiong, Huo, Qun, University of Central Florida
- Abstract / Description
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This dissertation presents a systematic study on gold nanoparticles: from their chemical synthesis, modification of surface functionalities, optical properties studies with emphasis on the absorption and scattering properties, to applications of gold nanoparticles in biomolecular detection, imaging and photothermal therapy. In chapter 2, we studied the kinetics of gold nanoparticle growth under Brust-Shiffrin reaction conditions. In chapter 3, we further examined the reaction mechanism and...
Show moreThis dissertation presents a systematic study on gold nanoparticles: from their chemical synthesis, modification of surface functionalities, optical properties studies with emphasis on the absorption and scattering properties, to applications of gold nanoparticles in biomolecular detection, imaging and photothermal therapy. In chapter 2, we studied the kinetics of gold nanoparticle growth under Brust-Shiffrin reaction conditions. In chapter 3, we further examined the reaction mechanism and growth kinetics of gold nanoparticles using oleylamine as both a reducing reagent and particle growth passivation ligand. From these two projects, important understanding was revealed on gold nanoparticle formation and growth mechanism. Chapter 4 describes the synthesis of a monofunctional gold nanoparticle through a solid phase place exchange reaction. From Chapter 5, we moved to the optical property study of gold nanoparticles, particularly the absorption and scattering phenomenon. In this work a systematic analysis on the extinction coefficient of gold nanoparticles was performed, providing meaningful references for applications based on optical absorption properties of gold nanoparticles. In Chapter 6 and Chapter 7, we developed a one-step homogeneous immunoassay for protein detection and analysis based on the strong light scattering of gold nanoparticles and dynamic light scattering detection technique. In Chapter 8, we further improved the stability of gold nanoparticle bioconjugates using a poly(ethylene glycol)-coated gold nanoparticles and further tested this nanoparticle in the one-step homogeneous immunoassay. Finally in Chapter 9, we demonstrated the application of gold nanoparticles for in vitro bioimaging and photothermal therapy of a lung cancer cell. In summary, this dissertation presents a comprehensive study on the synthesis, surface modification, property study of gold nanoparticles and their applications in biomolecular imaging and analysis.
Show less - Date Issued
- 2009
- Identifier
- CFE0002874, ucf:48020
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002874
- Title
- LIGHTING DESIGN FOR FROM SUN TO SUN: A DAY IN A RAILROAD CAMP.
- Creator
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Szewczyk, Nathan, Scott, Bert, University of Central Florida
- Abstract / Description
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In this thesis the notion of a theoretical approach to the beginning stages of designing lighting for a theatrical production will be discussed. The topic being researched is: How a theoretical approach to entering the design process will enhance the final lighting design. The target audience for this study is theatrical lighting designers. A theoretical approach, in this case to the beginning of the design process, could be described as utilizing current dramatic theories to develop a better...
Show moreIn this thesis the notion of a theoretical approach to the beginning stages of designing lighting for a theatrical production will be discussed. The topic being researched is: How a theoretical approach to entering the design process will enhance the final lighting design. The target audience for this study is theatrical lighting designers. A theoretical approach, in this case to the beginning of the design process, could be described as utilizing current dramatic theories to develop a better understanding for the design of this production. In order to better understand this topic one would need to know how the process of lighting design is typically created and where the theoretical approach is implemented. An issue with this approach is that the short period allowed for the design process does not allow sufficient time to utilize a theoretical approach in a real world setting. A way of determining if this process is effective is through personal self review. Journaling and discussion with my advisor for this production will be the method of data collection. The method of validation will be a self reflection at the end of the final performance. An issue with the collection process is its reliance on personal opinions, including the author's. There are no ethical issues relating to this study. When applied, a theoretical approach to the design process will enhance the quality of the final lighting design through allowing the designer to be better prepared for a specific scene that he/she is struggling with.
Show less - Date Issued
- 2011
- Identifier
- CFE0003609, ucf:48874
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003609
- Title
- Self-Assembled Two-Component Organic Tubes: Structures and Applications.
- Creator
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Liang, Wenlang, Fang, Jiyu, Huo, Qun, Deng, Weiwei, University of Central Florida
- Abstract / Description
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Bile acids are physiologically important metabolites, which are synthesized in liver as the end products of cholesterol metabolism and then secreted into the intestines. They play a critical role in the digestion and absorption of fats and fat-soluble vitamins through emulsifications. The amphipathic and chiral nature of bile acids makes their unique building blocks for assembling supramolecular structures including vesicles, fibers, ribbons and hollow tubes. Lithocholic acid (LCA) is a...
Show moreBile acids are physiologically important metabolites, which are synthesized in liver as the end products of cholesterol metabolism and then secreted into the intestines. They play a critical role in the digestion and absorption of fats and fat-soluble vitamins through emulsifications. The amphipathic and chiral nature of bile acids makes their unique building blocks for assembling supramolecular structures including vesicles, fibers, ribbons and hollow tubes. Lithocholic acid (LCA) is a secondary bile acid. Our studies show LCA can self-assemble into helical tubes in aqueous solution by the linear aggregation and fusion of vesicles. The objective of this dissertation is to tune the structure of helical tubes and functionalize them by the co-assembly of ionic LCA and cationic cetyltrimethylammonium bromide (CTAB) and ionic LCA and cationic cyanine dye (CD), respectively. The first part of this dissertation focuses on the ionic-assembly of LCA and CTAB to synthesize the helical tubes with varied diameters and pitches. Our studies show that LCA and CTAB can self-assemble into helical tubes in NH4OH aqueous solution. The diameter of the helical tubes can be changed by adjusting the molar ratio of LCA and CTAB. The pitch of the helical tubes can be tuned by varying NH4OH concentrations. Differential scanning calorimetry studies indicate that there is a homogeneous composition distribution in the LCA/CTAB helical tubes. X-ray diffraction analysis studies show that the helical tubes have multibilayer walls with an average d-spacing of 4.11nm. We demonstrate that the helical tubes with varied diameters and pitches can be transformed into helical silica through the sol-gel transcription of tetraethoxysilane (TEOS). The second part of this dissertation is to use the ionic self-assembly of LCA and CD to design light-harvesting tubes by mimicking green sulfur bacteria that are known to be a highly efficient photosynthesizer. X-ray diffraction and optical spectra show that LCA and CD can co-assemble into J- or H-aggregate tubes, depending the condition under which the self-assembly occurs. We demonstrate the feasibility of using the J-aggregate nanotubes in the sensitive and selective detection of mercury (II) ions by the photoinduced electron transfer under sunlight. The presence of mercury (II) ions in aqueous solution could be detected for concentrations as low as 10 pM.
Show less - Date Issued
- 2013
- Identifier
- CFE0005201, ucf:50635
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005201
