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- Title
- The Restorative Effects of Color and Environment Type on Cognitive Functioning.
- Creator
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Michaelis, Jessica, Smither, Janan, Kincaid, John, Beidel, Deborah, Mcconnell, Daniel, University of Central Florida
- Abstract / Description
-
Although individuals have limited directed attention capabilities, it has been shown that exposure to natural environments elicit cognitive restoration (i.e. Berman, 2008). It has also been shown that individuals prefer blue and green colors because they are relaxing and prompt happy feelings (Guilford (&) Smith, 1959; Mahnke, 1996; Wexner, 1954). The question however, is what aspects of nature elicit these effects: is it the natural colors, the environmental setting, or both? The present...
Show moreAlthough individuals have limited directed attention capabilities, it has been shown that exposure to natural environments elicit cognitive restoration (i.e. Berman, 2008). It has also been shown that individuals prefer blue and green colors because they are relaxing and prompt happy feelings (Guilford (&) Smith, 1959; Mahnke, 1996; Wexner, 1954). The question however, is what aspects of nature elicit these effects: is it the natural colors, the environmental setting, or both? The present experiment will examine the effects of color (Blue, Green, Black and White, (&) Natural) and environmental setting (Urban, Foliage, (&) Aquatic) on measures of attention, short term memory, and mood. Additionally, this study was designed to replicate the findings of Berman et.al 2008, all while rigorously controlling for the pictorial content of its manipulation. Due to the exploratory nature of this study, no specific hypotheses were made. However, the goal of this research was to (")tease apart(") the effects of color and environment on the restoration of cognitive abilities. One hundred and nineteen non-color blind individuals completed pre and post tests for the State Trait Anxiety Inventory (Form Y-1), Backwards Digit Span, and the Attention Network Task and viewed one of the twelve color/environmental setting picture sets between the pre and posttests. Results of the 2x3x4 Mixed ANOVAs do not support past research which suggests that natural environments are restorative in nature.
Show less - Date Issued
- 2013
- Identifier
- CFE0004892, ucf:49665
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004892
- Title
- COLOR PSYCHOTHERAPY AND PAINTING IN THE SATELLITE-EXPANDED FIELD.
- Creator
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Urban, Katherine, Haxton, John, University of Central Florida
- Abstract / Description
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My work deals with the subconscious pairing of colors from an instinctively chosen color palette into molded forms. My emotions drive these pairings. As I visualize these different emotions, I ask the viewer to formulate their own perceptions and connections (both physical and emotional) in relation to my own. This allows the viewer to explore the emotional twists and turns of my imagination by their own unique associations in correspondence. Painting allows me to visualize the inner depth of...
Show moreMy work deals with the subconscious pairing of colors from an instinctively chosen color palette into molded forms. My emotions drive these pairings. As I visualize these different emotions, I ask the viewer to formulate their own perceptions and connections (both physical and emotional) in relation to my own. This allows the viewer to explore the emotional twists and turns of my imagination by their own unique associations in correspondence. Painting allows me to visualize the inner depth of my imagination. My work becomes concrete through the subconscious pairing of colors and shapes and evolves with viewer interaction.
Show less - Date Issued
- 2009
- Identifier
- CFE0002601, ucf:48288
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002601
- Title
- Eye Color and its Possible Relation to Behavior.
- Creator
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Hollister, Debra L., McGuire, Jack M., Social Sciences
- Abstract / Description
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Florida Technological University College of Social Sciences Thesis; A variable that is capable of indicating one's cognitive and motor capaciteis has been the dream of many researchers. Until recently however, no researcher has seriously considered an independent variable that is obious among all people regardless of race or culture. This variable is eye color. This paper is a review of the experimental literature in this field and covers many areas including sociability, perception, learning...
Show moreFlorida Technological University College of Social Sciences Thesis; A variable that is capable of indicating one's cognitive and motor capaciteis has been the dream of many researchers. Until recently however, no researcher has seriously considered an independent variable that is obious among all people regardless of race or culture. This variable is eye color. This paper is a review of the experimental literature in this field and covers many areas including sociability, perception, learning, athletic abilities, and a few medical anomalies. Several alternative hypotheses are also offered as reasons for the obtained correlations. These ideas include culture, learning, and environment. Two other hypotheses are also presented to explain why eye color does play an important role in determining one's response to environmental stimuli. These ideas include a genetic and physiological basis. It is the hope of this author that this review may stimulate other researchers to perform more experiments in the area to help determine the amount of influence that they eye color has in individual responses to the environment.
Show less - Date Issued
- 1977
- Identifier
- CFR0004429, ucf:52973
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFR0004429
- Title
- AUTOMATED VISUAL DATABASE CREATION FOR A GROUND VEHICLE SIMULATOR.
- Creator
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Claudio, Pedro, Bauer, Christian, University of Central Florida
- Abstract / Description
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This research focuses on extracting road models from stereo video sequences taken from a moving vehicle. The proposed method combines color histogram based segmentation, active contours (snakes) and morphological processing to extract road boundary coordinates for conversion into Matlab™ or Multigen OpenFlight™ compatible polygonal representations. Color segmentation uses an initial truth frame to develop a color probability density function (PDF) of the road versus the terrain....
Show moreThis research focuses on extracting road models from stereo video sequences taken from a moving vehicle. The proposed method combines color histogram based segmentation, active contours (snakes) and morphological processing to extract road boundary coordinates for conversion into Matlab™ or Multigen OpenFlight™ compatible polygonal representations. Color segmentation uses an initial truth frame to develop a color probability density function (PDF) of the road versus the terrain. Subsequent frames are segmented using a Maximum Apostiori Probability (MAP) criteria and the resulting templates are used to update the PDFs. Color segmentation worked well where there was minimal shadowing and occlusion by other cars. A snake algorithm was used to find the road edges which were converted to 3D coordinates using stereo disparity and vehicle position information. The resulting 3D road models were accurate to within 1 meter.
Show less - Date Issued
- 2006
- Identifier
- CFE0001326, ucf:46994
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001326
- Title
- ALMOST REGULAR GRAPHS AND EDGE FACE COLORINGS OF PLANE GRAPHS.
- Creator
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Macon, Lisa, Zhao, Yue, University of Central Florida
- Abstract / Description
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Regular graphs are graphs in which all vertices have the same degree. Many properties of these graphs are known. Such graphs play an important role in modeling network configurations where equipment limitations impose a restriction on the maximum number of links emanating from a node. These limitations do not enforce strict regularity, and it becomes interesting to investigate nonregular graphs that are in some sense close to regular. This dissertation explores a particular class of almost...
Show moreRegular graphs are graphs in which all vertices have the same degree. Many properties of these graphs are known. Such graphs play an important role in modeling network configurations where equipment limitations impose a restriction on the maximum number of links emanating from a node. These limitations do not enforce strict regularity, and it becomes interesting to investigate nonregular graphs that are in some sense close to regular. This dissertation explores a particular class of almost regular graphs in detail and defines generalizations on this class. A linear-time algorithm for the creation of arbitrarily large graphs of the discussed class is provided, and a polynomial-time algorithm for recognizing graphs in the class is given. Several invariants for the class are discussed. The edge-face chromatic number χef of a plane graph G is the minimum number of colors that must be assigned to the edges and faces of G such that no edge or face of G receives the same color as an edge or face with which it is incident or adjacent. A well-known result for the upper bound of χef exists for graphs with maximum degree Δ ≥ 10. We present a tight upper bound for plane graphs with Δ = 9.
Show less - Date Issued
- 2009
- Identifier
- CFE0002507, ucf:47684
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002507
- Title
- Dynamically Tunable Plasmonic Structural Color.
- Creator
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Franklin, Daniel, Chanda, Debashis, Peale, Robert, Leuenberger, Michael, Wu, Shintson, University of Central Florida
- Abstract / Description
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Functional surfaces which can control light across the electromagnetic spectrum are highly desirable. With the aid of advanced modeling and fabrication techniques, researchers have demonstrated surfaces with near arbitrary tailoring of reflected/transmitted amplitude, phase and polarization - the applications for which are diverse as light itself. These systems often comprise of structured metals and dielectrics that, when combined, manifest resonances dependent on structural dimensions. This...
Show moreFunctional surfaces which can control light across the electromagnetic spectrum are highly desirable. With the aid of advanced modeling and fabrication techniques, researchers have demonstrated surfaces with near arbitrary tailoring of reflected/transmitted amplitude, phase and polarization - the applications for which are diverse as light itself. These systems often comprise of structured metals and dielectrics that, when combined, manifest resonances dependent on structural dimensions. This attribute provides a convenient and direct path to arbitrarily engineer the surface's optical characteristics across many electromagnetic regimes. But while many of these plasmonic systems struggle to compete with the efficiency of pre-existing technologies, the ability to tune plamsonic structures post-fabrication is a distinct advantage which may lead to novel devices. In this work, I will summarize fundamental and applied aspects of tunable plasmonic systems as applied to the visible and infrared regimes. I will demonstrate how liquid crystal may be used to dynamically and reversibly tune the plasmonic resonances of metallic surfaces on a millisecond time scale. For the visible, this results in dynamic color-changing surfaces capable of covering the entire RGB color space and which is compatible with active addressing schemes. I will then show the application of these concepts to infrared absorbers through the use of liquid crystal and phase change materials. The later of these devices can find use in infrared data/image encoding, thermal management and camouflage. Together, these works explore the limits of tunable plasmonic systems and the novel devices they might lead to.
Show less - Date Issued
- 2018
- Identifier
- CFE0007001, ucf:52052
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007001
- Title
- Color-Ratio Based Strawberry Plant Localization and Nutrition Deficiency Detection.
- Creator
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Kong, Xiangling, Xu, Yunjun, Elgohary, Tarek, Fu, Qiushi, Wu, Dazhong, Wang, Liqiang, University of Central Florida
- Abstract / Description
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In recent years, precision agriculture has become popular anticipating to partially meet the needs of an ever-growing population with limited resources. Plant localization and nutrient de?ciency detection are two important tasks in precision agriculture. In this dissertation, these two tasks are studied by using a new color-ratio(C-R) index technique. Firstly, a low cost and light scene invariant approach is proposed to detect green and yellow leaves based on the color-ratio (C-R) indices. A...
Show moreIn recent years, precision agriculture has become popular anticipating to partially meet the needs of an ever-growing population with limited resources. Plant localization and nutrient de?ciency detection are two important tasks in precision agriculture. In this dissertation, these two tasks are studied by using a new color-ratio(C-R) index technique. Firstly, a low cost and light scene invariant approach is proposed to detect green and yellow leaves based on the color-ratio (C-R) indices. A plant localization approach is then developed using the relative pixel relationships of adjacent plants. Secondly, the Sobel operator and morphology techniques are applied to segment the target strawberry leaf from a ?eld image. The characterized color for a speci?c nutrient de?ciency is detected by the C-R indices. The pattern of the detected color on the leaf is then examined to determine the speci?c nutrient de?ciency. The proposed approaches are validated in a commercial strawberry farm.
Show less - Date Issued
- 2019
- Identifier
- CFE0007666, ucf:52482
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007666
- Title
- PERFORMANCE IMPLICATIONS OF ALTERNATIVE COLOR-CODESIN AIRPORT X-RAY BAGGAGE SCREENING.
- Creator
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Hilscher, Matthew, Jentsch, Florian, University of Central Florida
- Abstract / Description
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This research investigated both cognitive and affective influences of alternative color combinations in a search task paradigm. The effects of re-mapping the existing, comparatively arbitrarily color codes of baggage X-ray images, were explored. Alternative color-codes were evaluated for improving the economy of visual search in X-ray baggage screening. Using a 2 x 2 between-groups design, the perceptual aspects of color-codes varying in degree of visual agreeability (accordant or discordant)...
Show moreThis research investigated both cognitive and affective influences of alternative color combinations in a search task paradigm. The effects of re-mapping the existing, comparatively arbitrarily color codes of baggage X-ray images, were explored. Alternative color-codes were evaluated for improving the economy of visual search in X-ray baggage screening. Using a 2 x 2 between-groups design, the perceptual aspects of color-codes varying in degree of visual agreeability (accordant or discordant) and color contrast (high or low) were examined in terms of efficiency (reaction time) and effectiveness (detection accuracy). Three hypotheses were put forth; two postulated main effects for color contrast and for visual agreeability, and a third postulated an interaction. Additionally, for comparison purposes, a fifth group of participants was presented with a stimulus condition that represented the current industry standard for colorizing X-ray images. Out of 100 volunteers, data were usable for 95 participants who had been randomly assigned to one of five conditions. All participants were exposed to the same screening task. The screening task required participants to view 153 X-ray images in random order. Of these images, 36 contained a single threat item (knife, scissor, gun) among clutter. Analyses of variance revealed significant differences between conditions with respect to detection accuracy. Implications are that high-color contrast improves detection accuracy; specifically with respect to correct rejections, and that this effect on performance can be moderated by psycho-emotional mechanisms. Specifically, the impact of color-contrast was significantly more pronounced under conditions of accordant color combinations. Theoretical underpinnings and applications to other domains are discussed.
Show less - Date Issued
- 2005
- Identifier
- CFE0000345, ucf:52835
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000345
- Title
- ON SATURATION NUMBERS OF RAMSEY-MINIMAL GRAPHS.
- Creator
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Davenport, Hunter M, Song, Zi-Xia, University of Central Florida
- Abstract / Description
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Dating back to the 1930's, Ramsey theory still intrigues many who study combinatorics. Roughly put, it makes the profound assertion that complete disorder is impossible. One view of this problem is in edge-colorings of complete graphs. For forbidden graphs H1,...,Hk and a graph G, we write G "arrows" (H1,...,Hk) if every k-edge-coloring of G contains a monochromatic copy of Hi in color i for some i=1,2,...,k. If c is a (red, blue)-edge-coloring of G, we say c is a bad coloring if G contains...
Show moreDating back to the 1930's, Ramsey theory still intrigues many who study combinatorics. Roughly put, it makes the profound assertion that complete disorder is impossible. One view of this problem is in edge-colorings of complete graphs. For forbidden graphs H1,...,Hk and a graph G, we write G "arrows" (H1,...,Hk) if every k-edge-coloring of G contains a monochromatic copy of Hi in color i for some i=1,2,...,k. If c is a (red, blue)-edge-coloring of G, we say c is a bad coloring if G contains no red K3or blue K1,t under c. A graph G is (H1,...,Hk)-Ramsey-minimal if G arrows (H1,...,Hk) but no proper subgraph of G has this property. Given a family F of graphs, we say that a graph G is F-saturated if no member of F is a subgraph of G, but for any edge xy not in E(G), G + xy contains a member of F as a subgraph. Letting Rmin(K3, K1,t) be the family of (K3,K1,t)-Ramsey minimal graphs, we study the saturation number, denoted sat(n,Rmin(K3,K1,t)), which is the minimum number of edges among all Rmin(K3,K1,t)-saturated graphs on n vertices. We believe the methods and constructions developed in this thesis will be useful in studying the saturation numbers of (K4,K1,t)-saturated graphs.
Show less - Date Issued
- 2018
- Identifier
- CFH2000291, ucf:45881
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH2000291
- Title
- LINGUISTIC RELATIVITY AND MULTILINGUALISM.
- Creator
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Casorio, Nicholas, Reyes-Foster, Beatriz, University of Central Florida
- Abstract / Description
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Over the last decade, linguistic relativity has seen a resurgence in research and discourse on thought, language, and culture. One particular facet of this research, multilingualism, has been relatively sparse in comparison to the wealth of research available focusing on individual languages and monolingual speakers. This study represents a preliminary investigation that enters this arena by focusing specifically on how speakers of English as a second language use English basic color terms in...
Show moreOver the last decade, linguistic relativity has seen a resurgence in research and discourse on thought, language, and culture. One particular facet of this research, multilingualism, has been relatively sparse in comparison to the wealth of research available focusing on individual languages and monolingual speakers. This study represents a preliminary investigation that enters this arena by focusing specifically on how speakers of English as a second language use English basic color terms in respect to monolingual speakers. This is done by using a modified methodology from the World Color Survey as a comparative model of a speaker's division of colors. Participants in this study illicit responses for 160 color tiles taken from the Munsell color chart used as the basis of the World Color Survey. The results of this study show that three of the ten multilingual participants division of the color space per English color terms falls outside of the normal range of variation between the monolingual English speakers who participated in this study. Though future research is needed to definitively posit the reasons for those participants color maps, this study provides a new window and inquiry into an under-researched area of linguistic relativity.
Show less - Date Issued
- 2015
- Identifier
- CFH0004885, ucf:45431
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004885
- Title
- DESIGNING FOR MULTICULTURAL AND INTERNATIONAL AUDIENCES: CREATING CULTURALLY-INTELLIGENT VISUAL RHETORIC AND OVERCOMING ETHNOCENTRISM.
- Creator
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Moore, Bridget, Jones, Dan, University of Central Florida
- Abstract / Description
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Various cultures interpret visual rhetoric differently; therefore, technical communicators must adjust their rhetoric accordingly by creating effective visual rhetoric for their international and multicultural audiences. Although there is a great deal of research in the field regarding how to create effective visual rhetorical rhetoric, this research often fails to take into international and multicultural audiences into consideration. Many visual rhetoric solutions proposed in technical...
Show moreVarious cultures interpret visual rhetoric differently; therefore, technical communicators must adjust their rhetoric accordingly by creating effective visual rhetoric for their international and multicultural audiences. Although there is a great deal of research in the field regarding how to create effective visual rhetorical rhetoric, this research often fails to take into international and multicultural audiences into consideration. Many visual rhetoric solutions proposed in technical communication involve ÂÂ"catch allÂÂ" approaches that do little to communicate to people of non-Western cultures and can even serve to offend or confuse international and multicultural audiences. These solutions are generated by a globalization mindset, but are not realistic when we acknowledge how varied technical communication audiences are with regard to culture. The globalization approach also fails unless technical communicators intend to limit the reach of their communication to certain types of Western audiences. To create the most useful visual rhetoric, technical communicators must learn to use color, graphics, icons/symbols, and layouts (web and print) appropriately for audiences. They must learn more about different types of cultures (individualistic or collectivistic, universalist or particularist, high-context or low-context, high uncertainty avoidance or low uncertainty avoidance, monochronic or polychronic, linear thinking or systemic thinking, masculine or feminine), and they must address these different cultural expectations accordingly.
Show less - Date Issued
- 2010
- Identifier
- CFE0003036, ucf:48333
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003036
- Title
- Ready or not, here comes college: A comparative correlation study of college readiness in Black and Hispanic students who take advanced level classes.
- Creator
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Pillay, Nigel, Lue, Martha, Hutchinson, Cynthia, Little, Mary, Taylor, Rosemarye, University of Central Florida
- Abstract / Description
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The purpose of this study was to investigate how participation in advanced level courses impacts college readiness in students of color, specifically Black and Hispanic students. High school students have a variety of advanced level classes to choose from, including but not limited to: Advanced Placement (AP), International Baccalaureate (IB), Dual Enrollment (DE), Advanced International Certificate of Education (AICE) and Advancement via Individual Determination (AVID) classes. These types...
Show moreThe purpose of this study was to investigate how participation in advanced level courses impacts college readiness in students of color, specifically Black and Hispanic students. High school students have a variety of advanced level classes to choose from, including but not limited to: Advanced Placement (AP), International Baccalaureate (IB), Dual Enrollment (DE), Advanced International Certificate of Education (AICE) and Advancement via Individual Determination (AVID) classes. These types of advanced classes not only prepare students for college but also allow them to earn college credit through participation in courses of college level rigor while still in high school. However, the number of students of color enrolled in advanced level classes has historically been substantially lower than that of their White counterparts (Kerr, 2014). Special incentives, grants, and funding have been put in place both at the state and federal levels to increase the number of students of color participating in these advanced classes. AVID is specifically designed to help increase college readiness for the most underrepresented student groups. In the past, the federal government, state policymakers, and companies such as College Board have started programs geared toward increasing AP and IB offerings for disadvantaged students and the number of students who take these courses (Iatarola, Conger, (&) Long, 2011). As a result of this effort, there has been a rise in participation in AP programs across the country with respect to Black and Hispanic students. This study was conducted to investigate how these advanced level courses impacted the level of college readiness among students of color in the fastest growing school district in Northeast Florida. The researcher aimed to determine if there was a difference in college readiness between students of color who take advanced level classes as opposed to those who do not. The principle purpose of this study was to examine the relationship between Black and Hispanic high school student participation in advanced academics and their college readiness.
Show less - Date Issued
- 2016
- Identifier
- CFE0006487, ucf:51396
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006487
- Title
- Interval Edge-Colorings of Graphs.
- Creator
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Foster, Austin, Song, Zixia, Reid, Michael, Brennan, Joseph, University of Central Florida
- Abstract / Description
-
A proper edge-coloring of a graph G by positive integers is called an interval edge-coloring if the colors assigned to the edges incident to any vertex in G are consecutive (i.e., those colors form an interval of integers). The notion of interval edge-colorings was first introduced by Asratian and Kamalian in 1987, motivated by the problem of finding compact school timetables. In 1992, Hansen described another scenario using interval edge-colorings to schedule parent-teacher conferences so...
Show moreA proper edge-coloring of a graph G by positive integers is called an interval edge-coloring if the colors assigned to the edges incident to any vertex in G are consecutive (i.e., those colors form an interval of integers). The notion of interval edge-colorings was first introduced by Asratian and Kamalian in 1987, motivated by the problem of finding compact school timetables. In 1992, Hansen described another scenario using interval edge-colorings to schedule parent-teacher conferences so that every person's conferences occur in consecutive slots. A solution exists if and only if the bipartite graph with vertices for parents and teachers, and edges for the required meetings, has an interval edge-coloring.A well-known result of Vizing states that for any simple graph $G$, $\chi'(G) \leq \Delta(G) + 1$, where $\chi'(G)$ and $\Delta(G)$ denote the edge-chromatic number and maximum degree of $G$, respectively. A graph $G$ is called class 1 if $\chi'(G) = \Delta(G)$, and class 2 if $\chi'(G) = \Delta(G) + 1$. One can see that any graph admitting an interval edge-coloring must be of class 1, and thus every graph of class 2 does not have such a coloring.Finding an interval edge-coloring of a given graph is hard. In fact, it has been shown that determining whether a bipartite graph has an interval edge-coloring is NP-complete. In this thesis, we survey known results on interval edge-colorings of graphs, with a focus on the progress of $(a, b)$-biregular bipartite graphs. Discussion of related topics and future work is included at the end. We also give a new proof of Theorem 3.15 on the existence of proper path factors of $(3, 4)$-biregular graphs. Finally, we obtain a new result, Theorem 3.18, which states that if a proper path factor of any $(3, 4)$-biregular graph has no path of length 8, then it contains paths of length 6 only. The new result we obtained and the method we developed in the proof of Theorem 3.15 might be helpful in attacking the open problems mentioned in the Future Work section of Chapter 5.
Show less - Date Issued
- 2016
- Identifier
- CFE0006301, ucf:51609
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006301
- Title
- Vertical Field Switching Blue Phase Liquid Crystals for Field Sequential Color Displays.
- Creator
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Cheng, Hui-Chuan, Wu, Shintson, Likamwa, Patrick, Schoenfeld, Winston, Wu, Xinzhang, University of Central Florida
- Abstract / Description
-
Low power consumption is a critical requirement for all liquid crystal display (LCD) devices. A field sequential color (FSC) LCD was proposed by using red (R), green (G) and blue (B) LEDs and removing the lossy component of color filters which only transmits ~30% of the incoming white light. Without color filters, FSC LCDs exhibit a ~3X higher optical efficiency and 3X higher resolution density as compared to the conventional color filters-based LCDs. However, color breakup (CBU) is a most...
Show moreLow power consumption is a critical requirement for all liquid crystal display (LCD) devices. A field sequential color (FSC) LCD was proposed by using red (R), green (G) and blue (B) LEDs and removing the lossy component of color filters which only transmits ~30% of the incoming white light. Without color filters, FSC LCDs exhibit a ~3X higher optical efficiency and 3X higher resolution density as compared to the conventional color filters-based LCDs. However, color breakup (CBU) is a most disturbing defect that degrades the image quality in FSC displays. CBU can be observed in stationary or moving images. It manifests in FSC LCDs when there is a relative speed between the images and observers' eyes, and the observer will see the color splitting patterns or rainbow effect at the boundary between two different colors.In Chapter 2, we introduce a five-primary display by adding additional yellow(Y) and cyan(C) colors. From the analysis and simulations, five primaries can provide wide color gamut and meanwhile the white brightness is increased, as compared to the three-primary. Based on the five-primary theorem, we propose a method to reduce CBU of FSC LCDs by using RGBYC LEDs instead of RGB LEDs in the second section. Without increasing the sub-frame rate as three-primary LCDs, we can reduce the CBU by utilizing proper color sequence and weighting ratios. In addition, the color gamut achieves 140% NTSC and the white brightness increases by more than 13%, as compared to the three-primary FSC LCDs.Another strategy to suppress CBU is using higher field frequency, such as 540 Hz or even up to 1000 Hz. However, this approach needs liquid crystals with a very fast response time ((<)1 ms). Recently, the polymer-stabilized blue-phase liquid crystal (PS-BPLC) draws great attentions because of improved temperature range which enables the applications for photonic devices and displays. PS-BPLC is a good candidate for FSC LCDs because of its submillisecond gray-to-gray response time, no need for alignment layer, and isotropic dark state. So far, almost all the BPLC devices utilize planar or protruded in-plane switching (IPS) electrode configuration. The structure of planar IPS is relatively simple, but the operating voltage is too high for thin-film transistor (TFT) addressing. Moreover, high voltage causes deformation of polymer network and induces a noticeable hysteresis. Protruded IPS is helpful for lowering the operating voltage, but the manufacturing process becomes more sophisticated. In Chapter 3, we propose a vertical field switching (VFS) mode for blue phase LCDs. The simple structure of VFS cell generates uniform vertical fields on the BPLC materials. From our experimental results, the operation voltage can be reduced to ~10Vrms while eliminating the hysteresis. We also defined a critical field below which hysteresis does not occur. Above critical field, lattice distortion and other irreversible phase transition processes would occur. As a result, the associated response time would be slower. Therefore, VFS mode also shows faster response time than IPS mode. The operating voltage can be further reduced by choosing an optimized cell gap and a larger oblique incident angle in VFS blue phase LCDs.In Chapter 4, we propose several compensation mechanisms to improve the viewing angle of VFS blue-phase LCDs. The compensation principles are analyzed and simulation results evaluated. Because VFS blue-phase LCD processes several advantages over IPS blue-phase LCD and conventional LCDs, it could become a strong contender for next-generation display technology.
Show less - Date Issued
- 2012
- Identifier
- CFE0004780, ucf:49772
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004780
- Title
- REAL-TIME MONOCULAR VISION-BASED TRACKING FOR INTERACTIVE AUGMENTED REALITY.
- Creator
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Spencer, Lisa, Guha, Ratan, University of Central Florida
- Abstract / Description
-
The need for real-time video analysis is rapidly increasing in today's world. The decreasing cost of powerful processors and the proliferation of affordable cameras, combined with needs for security, methods for searching the growing collection of video data, and an appetite for high-tech entertainment, have produced an environment where video processing is utilized for a wide variety of applications. Tracking is an element in many of these applications, for purposes like detecting anomalous...
Show moreThe need for real-time video analysis is rapidly increasing in today's world. The decreasing cost of powerful processors and the proliferation of affordable cameras, combined with needs for security, methods for searching the growing collection of video data, and an appetite for high-tech entertainment, have produced an environment where video processing is utilized for a wide variety of applications. Tracking is an element in many of these applications, for purposes like detecting anomalous behavior, classifying video clips, and measuring athletic performance. In this dissertation we focus on augmented reality, but the methods and conclusions are applicable to a wide variety of other areas. In particular, our work deals with achieving real-time performance while tracking with augmented reality systems using a minimum set of commercial hardware. We have built prototypes that use both existing technologies and new algorithms we have developed. While performance improvements would be possible with additional hardware, such as multiple cameras or parallel processors, we have concentrated on getting the most performance with the least equipment. Tracking is a broad research area, but an essential component of an augmented reality system. Tracking of some sort is needed to determine the location of scene augmentation. First, we investigated the effects of illumination on the pixel values recorded by a color video camera. We used the results to track a simple solid-colored object in our first augmented reality application. Our second augmented reality application tracks complex non-rigid objects, namely human faces. In the color experiment, we studied the effects of illumination on the color values recorded by a real camera. Human perception is important for many applications, but our focus is on the RGB values available to tracking algorithms. Since the lighting in most environments where video monitoring is done is close to white, (e.g., fluorescent lights in an office, incandescent lights in a home, or direct and indirect sunlight outside,) we looked at the response to "white" light sources as the intensity varied. The red, green, and blue values recorded by the camera can be converted to a number of other color spaces which have been shown to be invariant to various lighting conditions, including view angle, light angle, light intensity, or light color, using models of the physical properties of reflection. Our experiments show how well these derived quantities actually remained constant with real materials, real lights, and real cameras, while still retaining the ability to discriminate between different colors. This color experiment enabled us to find color spaces that were more invariant to changes in illumination intensity than the ones traditionally used. The first augmented reality application tracks a solid colored rectangle and replaces the rectangle with an image, so it appears that the subject is holding a picture instead. Tracking this simple shape is both easy and hard; easy because of the single color and the shape that can be represented by four points or four lines, and hard because there are fewer features available and the color is affected by illumination changes. Many algorithms for tracking fixed shapes do not run in real time or require rich feature sets. We have created a tracking method for simple solid colored objects that uses color and edge information and is fast enough for real-time operation. We also demonstrate a fast deinterlacing method to avoid "tearing" of fast moving edges when recorded by an interlaced camera, and optimization techniques that usually achieved a speedup of about 10 from an implementation that already used optimized image processing library routines. Human faces are complex objects that differ between individuals and undergo non-rigid transformations. Our second augmented reality application detects faces, determines their initial pose, and then tracks changes in real time. The results are displayed as virtual objects overlaid on the real video image. We used existing algorithms for motion detection and face detection. We present a novel method for determining the initial face pose in real time using symmetry. Our face tracking uses existing point tracking methods as well as extensions to Active Appearance Models (AAMs). We also give a new method for integrating detection and tracking data and leveraging the temporal coherence in video data to mitigate the false positive detections. While many face tracking applications assume exactly one face is in the image, our techniques can handle any number of faces. The color experiment along with the two augmented reality applications provide improvements in understanding the effects of illumination intensity changes on recorded colors, as well as better real-time methods for detection and tracking of solid shapes and human faces for augmented reality. These techniques can be applied to other real-time video analysis tasks, such as surveillance and video analysis.
Show less - Date Issued
- 2006
- Identifier
- CFE0001075, ucf:46786
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001075
- Title
- THE EFFECT OF COLOR ON WORKING MEMORY PERFORMANCE.
- Creator
-
Galvez, Michelle, Neider, Mark, University of Central Florida
- Abstract / Description
-
This paper explores the effect of color on working memory performance. Interest in Baker-Miller pink surged with the finding by Schauss (1979) that it reduced aggression in aggravated detainees. However, research behind Baker-Miller pink has been influenced by biases and methodological errors. Its effects are likely overstated. Red and blue have also been studied for their effects on creativity, approach-avoidance conflict, detail-orientation, and most importantly, stress. Further research...
Show moreThis paper explores the effect of color on working memory performance. Interest in Baker-Miller pink surged with the finding by Schauss (1979) that it reduced aggression in aggravated detainees. However, research behind Baker-Miller pink has been influenced by biases and methodological errors. Its effects are likely overstated. Red and blue have also been studied for their effects on creativity, approach-avoidance conflict, detail-orientation, and most importantly, stress. Further research has been conducted on the effects of relaxation on cognition, with the conclusion that increased relaxation leads to improvements in working memory performance. This paper tests the effect of color on working memory performance. Accuracy on the n-back was compared across 4 colors�pink, red, blue, and black. No significant differences in accuracy were found in any of the color conditions, though the main effect of load was significant. Future research can increase the sample size and utilize a cognitive task that is inherently stressful.
Show less - Date Issued
- 2015
- Identifier
- CFH0004859, ucf:45484
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004859
- Title
- MULTIMEDIA COMPUTER-BASED TRAINING AND LEARNING: THE ROLE OF REFERENTIAL CONNECTIONS IN SUPPORTING COGNITIVE LEARNING OUTCOMES.
- Creator
-
Scielzo, Sandro, Jentsch, Florian, University of Central Florida
- Abstract / Description
-
Multimedia theory has generated a number of principles and guidelines to support computer-based training (CBT) design. However, the cognitive processes responsible for learning, from which these principles and guidelines stem from, are only indirectly derived by focusing on cognitive learning outcome differences. Unfortunately, the effects that cognitive processes have on learning are based on the assumption that cognitive learning outcomes are indicative of certain cognitive processes. Such...
Show moreMultimedia theory has generated a number of principles and guidelines to support computer-based training (CBT) design. However, the cognitive processes responsible for learning, from which these principles and guidelines stem from, are only indirectly derived by focusing on cognitive learning outcome differences. Unfortunately, the effects that cognitive processes have on learning are based on the assumption that cognitive learning outcomes are indicative of certain cognitive processes. Such circular reasoning is what prompted this dissertation. Specifically, this dissertation looked at the notion of referential connections, which is a prevalent cognitive process that is thought to support knowledge acquisition in a multimedia CBT environment. Referential connections, and the related cognitive mechanisms supporting them, are responsible for creating associations between verbal and visual information; as a result, their impact on multimedia learning is theorized to be far reaching. Therefore, one of the main goals of this dissertation was to address the issue of indirectly assessing cognitive processes by directly measuring referential connections to (a) verify the presence of referential connections, and (b) to measure the extent to which referential connections affect cognitive learning outcomes. To achieve this goal, a complete review of the prevalent multimedia theories was brought fourth. The most important factors thought to be influencing referential connections were extracted and cataloged into variables that were manipulated, fixed, covaried, or randomized to empirically examine the link between referential connections and learning. Specifically, this dissertation manipulated referential connections by varying the temporal presentation of modalities and the color coding of instructional material. Manipulating the temporal presentation of modalities was achieved by either presenting modalities simultaneously or sequentially. Color coding manipulations capitalized on pre-attentive highlighting and pairing of elements (i.e., pairing text with corresponding visuals). As such, the computer-based training varied color coding on three levels: absence of color coding, color coding without pairing text and corresponding visual aids, and color coding that also paired text and corresponding visual aids. The modalities employed in the experiment were written text and static visual aids, and the computer-based training taught the principles of flight to naïve participants. Furthermore, verbal and spatial aptitudes were used as covariates, as they consistently showed to affect learning. Overall, the manipulations were hypothesized to differentially affect referential connections and cognitive learning outcomes, thereby altering cognitive learning outcomes. Specifically, training with simultaneously presented modalities was hypothesized to be superior, in terms of referential connections and learning performance, to a successive presentation, and color coding modalities with pairing of verbal and visual correspondents was hypothesized to be superior to other forms of color coding. Finally, it was also hypothesized that referential connections would positively correlate with cognitive learning outcomes and, indeed, mediate the effects of temporal contiguity and color coding on learning. A total of 96 were randomly assigned to one of the six experimental groups, and were trained on the principles of flight. The key construct of referential connections was successfully measured with three methods. Cognitive learning outcomes were captured by a traditional declarative test and by two integrative (i.e., knowledge application) tests. Results showed that the two multimedia manipulation impacted cognitive learning outcomes and did so through corresponding changes of related referential connections (i.e., through mediation). Specifically, as predicted, referential connections mediated the impact of both temporal contiguity and color coding on lower- and higher-level cognitive learning outcomes. Theoretical and practical implications of the results are discussed in relation to computer-based training design principles and guidelines. Specifically, theoretical implications focus on the contribution that referential connections have on multimedia learning theory, and practical implications are brought forth in terms of instructional design issues. Future research considerations are described as they relate to further exploring the role of referential connections within multimedia CBT paradigms.
Show less - Date Issued
- 2008
- Identifier
- CFE0002224, ucf:47899
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002224
- Title
- The Frequency of the Twelve Verb Tenses in History Papers Written by University Native Writers.
- Creator
-
Qahtani, Bushra, Folse, Keith, Young, Beth, Fernandez-Rubiera, Francisco, University of Central Florida
- Abstract / Description
-
Due to the variety and complexity of verb tenses in English, English as a Second Language (ESL) / English as a Foreign Language (EFL) learners often experience difficulty in mastering English verb tense system. This corpus-based study was conducted to ascertain the most frequently used verb tenses by English native speakers (NSs), specifically in their academic writing in a history course. As this study aimed to examine the naturally-occurring language produced by NSs, specifically in their...
Show moreDue to the variety and complexity of verb tenses in English, English as a Second Language (ESL) / English as a Foreign Language (EFL) learners often experience difficulty in mastering English verb tense system. This corpus-based study was conducted to ascertain the most frequently used verb tenses by English native speakers (NSs), specifically in their academic writing in a history course. As this study aimed to examine the naturally-occurring language produced by NSs, specifically in their academic writing, an original corpus of 101,713 words was assembled. The corpus consisted of 130 research papers written by 65 students. The corpus was analyzed, targeting certain linguistic items: the twelve verb tenses, modals, perfect modals, and imperatives. These targets were highlighted using a code-coloring method. Then, the items were calculated using Microsoft Excel. Excel calculations revealed the number of occurrences of each of the verb tenses, modals, perfect modals, and imperatives that was utilized in the corpus. The results revealed that the simple past tense was predominant, followed by the simple present tenses. Modals came third, as they occurred more frequently than any of the other verb tenses. The remaining targets had percentages ranging between 1.62% and zero. These findings could contribute in developing the methodology of teaching verb tenses to ESL/EFL learners in a way that reinforces their comprehension of the most important and most common items. In addition, this information is very important for materials designers and curriculum professionals.
Show less - Date Issued
- 2017
- Identifier
- CFE0007293, ucf:52150
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007293
- Title
- Hadwiger Numbers and Gallai-Ramsey Numbers of Special Graphs.
- Creator
-
Bosse, Christian, Song, Zixia, Brennan, Joseph, Zhao, Yue, DeMara, Ronald, University of Central Florida
- Abstract / Description
-
This dissertation explores two separate topics on graphs.We first study a far-reaching generalization of the Four Color Theorem. Given a graph G, we use chi(G) to denote the chromatic number; alpha(G) the independence number; and h(G) the Hadwiger number, which is the largest integer t such that the complete graph K_t can be obtained from a subgraph of G by contracting edges. Hadwiger's conjecture from 1943 states that for every graph G, h(G) is greater than or equal to chi(G). This is...
Show moreThis dissertation explores two separate topics on graphs.We first study a far-reaching generalization of the Four Color Theorem. Given a graph G, we use chi(G) to denote the chromatic number; alpha(G) the independence number; and h(G) the Hadwiger number, which is the largest integer t such that the complete graph K_t can be obtained from a subgraph of G by contracting edges. Hadwiger's conjecture from 1943 states that for every graph G, h(G) is greater than or equal to chi(G). This is perhaps the most famous conjecture in Graph Theory and remains open even for graphs G with alpha(G) less than or equal to 2. Let W_5 denote the wheel on six vertices. We establish more evidence for Hadwiger's conjecture by proving that h(G) is greater than or equal to chi(G) for all graphs G such that alpha(G) is less than or equal to 2 and G does not contain W_5 as an induced subgraph.Our second topic is related to Ramsey theory, a field that has intrigued those who study combinatorics for many decades. Computing the classical Ramsey numbers is a notoriously difficult problem, leaving many basic questions unanswered even after more than 80 years. We study Ramsey numbers under Gallai-colorings. A Gallai-coloring of a complete graph is an edge-coloring such that no triangle is colored with three distinct colors. Given a graph H and an integer k at least 1, the Gallai-Ramsey number, denoted GR_k(H), is the least positive integer n such that every Gallai-coloring of K_n with at most k colors contains a monochromatic copy of H. It turns out that GR_k(H) is more well-behaved than the classical Ramsey number R_k(H), though finding exact values of GR_k(H) is far from trivial. We show that for all k at least 3, GR_k(C_{2n+1}) = n2^k+1 where n is 4, 5, 6 or 7, and GR_k(C_{2n+1}) is at most (n ln n)2^k-(k+1)n+1 for all n at least 8, where C_{2n+1} denotes a cycle on 2n+1 vertices.
Show less - Date Issued
- 2019
- Identifier
- CFE0007603, ucf:52532
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007603
- Title
- An investigation of the relationship between visual effects and object identification using eye-tracking.
- Creator
-
Rosch, Jonathan, Schoenfeld, Winston, Likamwa, Patrick, Wu, Shintson, Vogel-Walcutt, Jennifer, University of Central Florida
- Abstract / Description
-
The visual content represented on information displays used in training environments prescribe display attributes as brightness, color, contrast, and motion blur, but considerations regarding cognitive processes corresponding to these visual features require further attention in order to optimize the display for training applications. This dissertation describes an empirical study with which information display features, specifically color and motion blur reduction, were investigated to...
Show moreThe visual content represented on information displays used in training environments prescribe display attributes as brightness, color, contrast, and motion blur, but considerations regarding cognitive processes corresponding to these visual features require further attention in order to optimize the display for training applications. This dissertation describes an empirical study with which information display features, specifically color and motion blur reduction, were investigated to assess their impact in a training scenario involving visual search and threat detection. Presented in this document is a review of the theory and literature describing display technology, its applications to training, and how eye-tracking systems can be used to objectively measure cognitive activity. The experiment required participants to complete a threat identification task, while altering the displays settings beforehand, to assess the utility of the display capabilities. The data obtained led to the conclusion that motion blur had a stronger impact on perceptual load than the addition of color. The increased perceptual load resulted in approximately 8-10% longer fixation durations for all display conditions and a similar decrease in the number of saccades, but only when motion blur reduction was used. No differences were found in terms of threat location or threat identification accuracy, so it was concluded that the effects of perceptual load were independent of germane cognitive load.
Show less - Date Issued
- 2012
- Identifier
- CFE0004591, ucf:49219
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004591
