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8,628 Matching Results
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Bifunctional Enamine‐Metal Lewis Acid Catalysis and α-Enaminones for Cyclization Reactions
The use of enamines continues to be an important tool in organic syntheses as both a catalyst and reactant. The addition of metal catalysts coupled with enamine catalysis has generated many reactions that normally would not occur separately. However, catalysts' incompatibility is an issue that we wish to solve allowing new chemistry to occur without hindrance. The use of enamines has continued to be a well-studied area of organic chemistry, but the field is ripe for different types of enamines to gain the spotlight. Enaminones are enamines with both nucleophilic and electrophilic properties. They allow reactions that are normally not possible with enamines to become obtainable. Chapter 1 is a brief introduction on enamines and the reason they gained so much attention. Then ends with enaminones and what makes them interesting reactants. Chapter 2 described a new synthesis for the tricyclic synthesis of chromanes using a novel bifunctional catalyst system of enamine-metal Lewis acid giving great yields (up to 87 %yield) and excellent stereoselectivity (up to 99 % ee). Chapter 3 covered new reactions for ring-open cyclopropane (up to 94% yield), tetrahydroquinolinones (up to 84% yield) and enantiospecific tetrahydroquinolinones (up to 84% yield and 97% ee) using α-enaminone and donor-acceptor …
Date:
August 2022
Creator:
Davis, Jacqkis
System:
The UNT Digital Library
Ultrafast Charge Transfer in Donor-Acceptor Push-Pull Constructs
Ultrafast charge and electron transfer, primary events in artificial photosynthesis, are key in solar energy harvesting. This dissertation provides insight into photo-induced charge and electron transfer in the donor and acceptor constructs built using a range of donor and acceptor entities, including transition metal dichalcogenides (TMDs, molybdenum disulfide (MoS2), and tungsten disulfide (WS2)), N-doped graphene, diketopyrrolopyrrol (DPP), boron-dipyrromethene (BODIPY), benzothiadiazole (BTD), free base and metal porphyrins, zinc phthalocyanine (ZnPc), phenothiazine (PTZ), triphenylamine (TPA), ferrocene (Fc), fullerene (C60), tetracyanobutadiene (TCBD), and dicyanoquinodimethane (DCNQ). The carefully built geometries and configurations of the donor and (D), acceptor (A), with a spacer in these constructs promote intramolecular charge transfer, and intervalence charge transfer to enhance charge and electron transfer efficiencies. Steady-state UV-visible absorption spectroscopy, fluorescence and phosphorescence spectroscopies, electrochemistry (cyclic voltammetry (CV) and differential pulse voltammetry (DPV)), spectroelectrochemistry (absorption spectroscopy under controlled potential electrolysis), transient absorption spectroscopy, and quantum mechanical calculations (density functional theory, DFT) are used to probe ground and the excited state events as well as excited state charge separation resulting in cation and anion species. The current findings are useful for the increased reliance on renewable energy resources, especially solar energy.
Date:
August 2022
Creator:
Jang, Young Woo
System:
The UNT Digital Library
Efficient Convolutional Neural Networks for Image Processing Applications
Modern machine learning techniques focus on extremely deep and multi-pathed networks, resulting in large memory and computational requirements. This thesis explores techniques for designing efficient convolutional networks including pixel shuffling, depthwise convolutions, and various activation fucntions. These techniques are then applied to two image processing domains: single-image super-resolution and image compression. The super-resolution model, TinyPSSR, is one-third the size of the next smallest model in literature while performing similar to or better than other larger models on representative test sets. The efficient deep image compression model is significantly smaller than any other model in literature and performs similarly in both computational cost and reconstruction quality to the JPEG standard.
Date:
August 2022
Creator:
Chiapputo, Nicholas J.
System:
The UNT Digital Library
Aristotle on Being Triggered: A Question on Moral Virtue
I argue that Aristotle aids in understanding the tension between the political art and moral virtue through his examination of courage in The Nicomachean Ethics. The end of the political art is to habituate the city and citizens towards "the good." Aristotle examines five held opinions of non-courage, requiring that we reflect on our own vices. I describe how Aristotle prepares his readers for the task of examining the political art. I then view courage found in the citizen and spiritedness as an example of two common opinions where individuals are inclined towards pleasure, as opposed to being inclined to the noble. To conclude, I show that Aristotle provides opinions of non-courage to emphasize how institutions are, and must remain, a foundational part of society.
Date:
August 2022
Creator:
Barnes, Kenlea Rayne
System:
The UNT Digital Library
Self-Directed Leadership Development with Adaptive Learning 360-Feedback Platform
Leadership theories have evolved since their inception and leadership development should also evolve in response to the changing needs of their organizations. There is a gap in the literature on the functionality of the various 360-feedback platforms that are mentioned in literature which makes it difficult to understand what reporting functionality is available in existing systems. The goal of this study was to examine participants' views of a newly developed Adaptive Learning 360-feedback (AL360) treatment platform for leadership development with a focus on self-directed learning for improved accountability. Participants were asked to share their learning development experience in the areas of person, process, and context with suggestions for improvement and how did this development compare to any other leadership development that they had experienced in the past. The AL360 platform was built by applying the research findings of scholars in the areas of leadership, 360-feedback leadership development and educational technologies. The treatment was applied in a business setting for all levels of leadership development. The case study identified creation of leadership of self-awareness and accountability for development without significant intervention of an executive coach. The research findings also list improvement opportunities, limitations, and future considerations.
Date:
August 2022
Creator:
Ali, Zainul
System:
The UNT Digital Library
The Impact of Counter-Rumor Strategy and Source on Non-Professional Investors' Judgments over Social Media
Non-professional investors often rely on information obtained from social media to make investment decisions. Extant literature has not examined the most effective strategy for the target company to counter the rumors so that investors will be more willing to continue investing in the target firm. Drawing on source credibility theory and the moral intensity model, I propose that the most effective strategy would vary given different agents who are selected to counter the rumor. After conducting a 2 x 3 (counter-rumor source x counter-rumor strategy) experiment with 272 non-professional investors recruited from Amazon Mechanical Turk, my study shows that when an internal agent (e.g., the CEO) acts as a counter-rumor source, shareholders are more willing to invest in the company when the internal agent utilizes a denial strategy rather than a reassociation or a questioning strategy. In contrast, when an external agent (e.g., a famous food blogger) serves as the counter-rumor source, the external agent can also use a questioning strategy in addition to a denial strategy to motivate shareholders to be more willing to invest in the company; however, the external agent still needs to avoid from engaging a reassociation strategy. Moderated serial-mediation analysis shows that the persuasiveness of …
Date:
August 2022
Creator:
Li, Ziyin
System:
The UNT Digital Library
"All things at once": A Retrospective Qualitative Examination of the Parental Racial Ethnic Socialization Practices Experienced by Multiracial/Multiethnic Individuals
The purpose of this phenomenological study was to explore how individuals from different multiracial/multiethnic groups experience and process the phenomenon of parental racial ethnic socialization (RES). Critical multiracial race theory, critical race theory, and bioecological systems theory offered a conceptual framework to how RES is often presented and processed. This study was guided by two research questions: (1) What are the experiences of RES among multiracial individuals? and (2) How do multiracial individuals process the parental racial ethnic socialization they were offered? Nine qualitative, one-on-one, semistructured interviews were conducted with individuals from three different multiracial/multiethnic groups. Results revealed that experiences of RES varied along with how participants processed RES. Three subthemes and one theme emerged related to the RES experiences of participants. For some participants lack of conversations were evident in their RES, which meant that conversations surrounding multiraciality and other racialized topics were not present. Other participants disclosed the subtheme of preparedness as part of their RES experience, while others mentioned the importance of environment to their RES experience. Additionally, the theme of changes over time arose, demonstrating how different life events can impact RES experiences. As for how multiracial/multiethnic individuals process RES experiences, the main theme of identity …
Date:
August 2022
Creator:
Camacho Taylor, Jennifer
System:
The UNT Digital Library
Tales by Moonlight: An Exploratory Analysis of the Effects of a Storytelling Interview Package for Youths and Elders in an Historically Black Community
Storytelling is a practice that is used to pass down important information about culture, environment, and history. From a behavior analytic perspective, the process of storytelling involves contingencies and can be viewed within the framework of the Skinner's analysis of verbal behavior. For each listener, based on their history of learning and experiences, stories enable a unique type of learning about reinforcers, punishers and cultural context. In African American oral tradition, storytelling was and still is important in preserving the identity, safety, and wellbeing of African Americans. The purpose of this project was to inductively explore story telling between youth and elders in an African American community. A training workshop was developed that included an overview of the importance and role of storytelling in the black community and ways for youth to respectfully listen and learn from elders. The participants included two children and one elder. The independent variable was the training package, the dependent measures included the levels of synchronous engagement, the listener behaviors of the youth and the participant voices, that is, the descriptions and reflections of children and elders about the process and outcomes of this project. A multiple probes design across skills with in-vivo generalization check …
Date:
August 2022
Creator:
Akinwale, Oluwabukola Elizabeth
System:
The UNT Digital Library
Sea-ing Blue: Community Responses to an Eco-Award in Galveston, Texas
The Blue Flag program is a French international eco-award for beaches, marinas, and tour boats. With a set of 33 criteria required for obtaining the award, the Blue Flag program has sites all over the world, but none in the United States. The American Shore and Beach Preservation Association (ASBPA) sought to change that and provided an opportunity for locations in the U.S. to apply for the award. One of those applicants was the Galveston Island Park Board of Trustees in Galveston, Texas. This thesis focuses on data obtained for the park board through a survey to determine beachgoer support and interest in the Blue Flag program. Data was collected through the use of a survey and ad hoc interviews during the summer of 2021. Examined through various theoretical lenses, the data was analyzed to determine its impacts on the local community, and its relationship with other historical conservation projects. The results for this project were provided through a paper report and presentation on the findings to the client and presented at the ASBPA National Coastal Conference in October of 2021.
Date:
August 2022
Creator:
Butler, Kristin
System:
The UNT Digital Library
Concerning Millennials: Exploring Generational Cohort Effects on Racial Linked Fate, Religion and Politics, and Support for American Civil Liberities
This research examines the political implications of the Millennial generation on American politics by exploring the interaction of generational cohort with race, social issues, and civil liberties. Relying on the 2016 Collaborative Multiracial Post-Election Survey and the 2018 General Social Survey, I examine (1) Millennial attitudes toward race and ethnicity by looking specifically at racial linked fate, (2) how Millennials interact with race and evangelical Christianity and how this interaction influences social policy preferences, and (3) how generational factors influence Millennial attitudes toward American civil liberties. I find that there are measurable effects of generational cohorts on the predicted value of Linked Fate for racial minority groups in the United States. My results suggest that Millennials are significantly more likely to have higher levels of linked fate for Latino and Asian Americans. However, I do not find sufficient evidence to suggest that African Americans' level of linked fate is affected either positively or negatively for Millennials. Second, for the investigation on social policy, the results suggest that those who sit at the intersection of the three groups- the Latino-Millennial evangelicals- hold policy preferences that contrast from those who are solely either Latino, Millennial, or evangelical. Latino-Millennial evangelicals are significantly more …
Date:
August 2022
Creator:
Molinar, J. Antonio
System:
The UNT Digital Library
Scuffing and Wear Prevention in Low Viscosity Hydrocarbon Fuels
To design high pressure fuel system components that resist wear and scuffing failure when operated in low viscosity fuels, a comprehensive study on the tribological performance of various existing coating materials is necessary. This thesis aims to provide the relative performance of a variety of coating materials across different fuel environments by testing them in conditions that model those experienced in fuel pumps. The relative performance of these coatings are then indexed across a variety of material properties, including hardness, elastic modulus, wettability, and the interaction between the surface and the various types of fuel molecules.
Date:
August 2022
Creator:
Dockins, Maddox Wade
System:
The UNT Digital Library
Three Essays on Phishing Attacks, Individual Susceptibility, and Detection Accuracy
Phishing is a social engineering attack to deceive and persuade people to divulge private information like usernames and passwords, account details (including bank account details), and social security numbers. Phishers typically utilize e-mail, chat, text messages, or social media. Despite the presence of automatic anti-phishing filters, phishing messages reach online users' inboxes. Understanding the influence of phishing techniques and individual differences on susceptibility and detection accuracy is an important step toward creating comprehensive behavioral and organizational anti-phishing awareness programs. This dissertation seeks to achieve a dual purpose in a series of three essays. Essay 1 seeks to explore the nature of phishing threats that including identifying attack intentions, and psychological and design techniques of phishing attacks. Essay 2 seeks to understand the relative influence of attack techniques and individual phishing experiential traits on people's phishing susceptibility. Essay 3 seeks to understand an individual's cognitive and affective differences that differentiate between an individual's phishing detection accuracy.
Date:
August 2022
Creator:
Bera, Debalina
System:
The UNT Digital Library
Three Essays on Size Premium Puzzle
Size premium puzzle, also known as the size effect, is one of the most studied anomalies in asset pricing literature. It refers to the observation that, on average, smaller firms have higher risk-adjusted returns than larger firms over a long period of time. While many studies have debated the existence of the size effect, the question of why it exists has become a subject of heated debate. Thus, this dissertation aims to examine if previously overlooked factors can, at least partially, explain the size effect. Essay 1 examines if merger and acquisition activity can explain a part of the size effect. I find that merger and acquisition activity explain a part of the size effect. The size effect is found to be stronger during merger waves but is not consistent across industries. Further, the size effect tends to be stronger when acquisition activity is concentrated among smaller firms. Essay 2 investigates if expectational errors explain the higher return of small firms. Several empirical studies show that stocks that investors underestimate yield higher returns. However, I do not find support for the underestimation explanation in explaining the higher returns of small firms. Instead, I find that investors are overly optimistic about …
Date:
August 2022
Creator:
Ghimire, Ashish
System:
The UNT Digital Library
Utilization of Telemedicine by People with Chronic Health Conditions during the COVID-19 Pandemic
This study sought to better understand the experiences of individuals with a chronic health condition utilizing telemedicine during the first twelve months of the COVID-19 pandemic. To do this, an online survey was advertised in two private Facebook support groups for individuals with adrenal insufficiency; a chronic health condition that requires frequent communication with healthcare providers. The survey consisted primarily of closed-response questions which examined the demographic data of respondents, their access to healthcare providers, their comfort levels accessing healthcare providers, and the number of times individuals sought healthcare during the first twelve months of the COVID-19 pandemic to try and predict their preference for telemedicine and in-person healthcare visits going forward. Additionally, the survey included open-response questions which allowed for respondents to describe their experience utilizing telemedicine during the first twelve months of the COVID-19 pandemic. Most respondents described their use of telemedicine as being positive but have indicated there are some health circumstances in which telemedicine may not be the best option for them. Additionally, findings indicate that individual's comfort level in visiting their healthcare providers in-person during that first year of the COVID-19 pandemic is a significant predictor of an individual's preference for telehealth. This gives future …
Date:
August 2022
Creator:
Barker, Tori Saige
System:
The UNT Digital Library
Ethnic Parties: Their Emergence, Survival, and Impact
This dissertation examines the emergence of ethnic parties, their survival in the political system, and their impact on the governance practices. While scholars have long debated the impact of ethnic parties on state-building and democratization process, few works have empirically examined their behavior in the political system. Empirical research on ethnic parties is limited to single countries or regions -- Latin America, Eastern Europe, or a few countries including India. Firstly, this dissertation extends the research on ethnic parties to include another South Asian Country – Nepal. Secondly, research on ethnic parties has been hampered by the lack of cross-sectional data on ethnic parties. This dissertation employs new datasets on the electoral performance of ethnic parties, making use of the newly available resource. Employing both qualitative and quantitative techniques, this dissertation is built around three empirical chapters. Firstly, it argues that strategic interactions between major parties and ethnic groups, among others, determine why some ethnic groups successfully form their own parties and others do not. Secondly, it argues that the factors that are responsible for the emergence of ethnic parties are hardly sufficient for the survival of these parties in the long run and shows that ethnic parties' access to …
Date:
August 2022
Creator:
Basnet, Post Bahadur
System:
The UNT Digital Library
"Come along, Floyd!" An Ethnographic Study of the Crystal Cave District at Mammoth Cave National Park
Cultural landscape reports (CLR) are commonly utilized by the National Park Service to define the significance of cultural landscapes. This thesis explores the importance of documenting not only physical characteristics of cultural landscapes, but the cultural elements such as associated values, beliefs, ideas, and traditions. My applied research was conducted for Mammoth Cave National located in Mammoth Cave, Kentucky and focuses on the Crystal Cave District. Research explores data collected through archival research, a PPGIS exercise, and ethnographic interviews to examine the experiences and relationships between research participants and the Crystal Cave District. Research findings highlight the ways in which concepts such as place, history, identity, and tradition can act as significant factors in shaping environmental relationships today.
Date:
August 2022
Creator:
McClain, Elisabeth Ray
System:
The UNT Digital Library
More Than Just a Test Score: Designing and Implementing a Community-Based Accountability System in One Texas School District
Since at least the 1960s, federal and state policymakers have debated how best to hold public schools accountable for producing graduates who are prepared to fully participate in our democratic society. Since that time, reform efforts have led to Texas' current test-based A-F accountability system. This qualitative case study explored how one Texas school district worked to design and implement an alternative accountability system. A community-based accountability system (CBAS) is created in collaboration with local stakeholders and uses locally developed goals and multiple achievement measures to report student and school performance. A zone of mediation theoretical framework was used to evaluate how the studied district assessed and addressed the community's norms, values, priorities, and goals for public schools. Data were drawn from an analysis of relevant documents, five individual district leader interviews, and a parent and/or community member focus group. These data were analyzed using a combination of a priori and in vivo coding. The six themes that emerged from this analysis were: (a) dissatisfaction with A-F accountability, (b) developing an alternative accountability, (c) collaboration with like-minded districts and leaders, (d) engagement with internal stakeholders; (e) engagement with external stakeholders, and (f) assessing community values and goals for public education. …
Date:
August 2022
Creator:
Leader, Joel Alan
System:
The UNT Digital Library
Multi-Level Effects of Oxygen Exposure in Endothermic Insects
This dissertation examined the phenotypic plasticity of endothermic, flight and respiratory physiology in response to developmental oxygen exposure in the moth Manduca sexta. Development in both 10% O2 hypoxia and 30% O2 hyperoxia treatments were used to look at the physiological consequence on both ends of the oxygen spectrum. Hypoxic insects reached smaller sizes as adults and had longer pupation lengths than controls. Hyperoxic insects were larger at the end of the larval stage, had increased larval growth rates, but also had longer developmental larval developmental times and pupation lengths than controls. There was a decrease in both metabolic rate and thorax temperatures of hypoxic reared insects at normoxic levels. In flight trials hypoxic insects had the lowest critical flight PO2, and the hyperoxic insects had the highest PO2. There was an increase in hypoxic insect flight muscle mitochondria oxygen consumption in permeabilized fibers, but this did not translate to the isolated flight muscle mitochondria metabolic rates. Rearing oxygen level did not significantly affect mitochondrial density and size; myofibril density and size, or tracheal density and size in flight muscle. Overall, I found that higher levels of organization were more susceptible to the effects of chronic oxygen exposure and found …
Date:
August 2022
Creator:
Wilmsen, Sara M
System:
The UNT Digital Library
The Influence of Social Responsibility on Consumer Behavior in Small Business Restaurants
This research quantifies the mediating effects of consumer satisfaction on the social responsibility dimensions of philanthropy, economics, environmental, ethical, and legal regarding the behavioral outcomes of consumer loyalty while developing a new model (small business social responsibility, SBSR) to measure these effects. The purpose of current study is to provide a contemporary perspective of the influence of organizational social responsibility strategy on consumer behavior regarding three specific characteristics: enterprise size (small business), population demographic (Generation Z), and type of industry (restaurant industry). The questionnaire was developed, modified, and designed to measure the mediating effects of consumer satisfaction on SBSR initiatives and the behavioral outcomes of consumer loyalty. Data were collected from January 15 to March 15, 2022. The sample for this study consisted of 233 students from a large public university in the southwestern United States. The study found social responsibility initiatives do impact consumer behaviors, although not all the initiatives studied had a significant effect on consumer satisfaction and ultimately on consume loyalty. Environmental initiatives had the strongest significance levels on both consumer satisfaction and consumer loyalty. Conversely, the initiatives of economics and legal had no significant influence of both consumer satisfaction and consumer loyalty. The study gave evidence …
Date:
August 2022
Creator:
Holladay, Travis John
System:
The UNT Digital Library
The Relationship between Self-Regulated Learning Strategies and Licensing Exam Readiness among Doctor of Chiropractic Students
Graduating competent healthcare providers to meet increasing demands of the United States leads to interest in graduate health science student success. In this study, I explored the relationship between self-regulated learning strategies and licensing exam readiness among Doctor of Chiropractic students. Two research questions asked (1) how self-regulated learning strategies vary by gender and year of study, and (2) how self-regulated learning strategies relate to licensing exam readiness. One hundred thirty-three students from five chiropractic institutions were surveyed with questions from the Motivated Strategies for Learning Questionnaire (MSLQ) and exam readiness items. A series of t-tests, one-way analyses of variance, Kruskal-Wallis H tests, and ordinary least squares (OLS) regression addressed the research questions. Results indicated (1) self-regulated learning strategies do vary by gender and year of study, and (2) self-regulation is related to licensing exam readiness, particularly in Parts I and II of the exam. Chiropractic institutions and policymakers should focus efforts on introducing and reinforcing self-regulated learning strategies throughout the curriculum and explore licensing exam implications. Future research should continue expanding the literature on chiropractic education by considering actual licensing exam performance and determining appropriateness of the MSLQ for chiropractic students.
Date:
August 2022
Creator:
Long, Ashley Nicole
System:
The UNT Digital Library
Advanced Stochastic Signal Processing and Computational Methods: Theories and Applications
Compressed sensing has been proposed as a computationally efficient method to estimate the finite-dimensional signals. The idea is to develop an undersampling operator that can sample the large but finite-dimensional sparse signals with a rate much below the required Nyquist rate. In other words, considering the sparsity level of the signal, the compressed sensing samples the signal with a rate proportional to the amount of information hidden in the signal. In this dissertation, first, we employ compressed sensing for physical layer signal processing of directional millimeter-wave communication. Second, we go through the theoretical aspect of compressed sensing by running a comprehensive theoretical analysis of compressed sensing to address two main unsolved problems, (1) continuous-extension compressed sensing in locally convex space and (2) computing the optimum subspace and its dimension using the idea of equivalent topologies using Köthe sequence. In the first part of this thesis, we employ compressed sensing to address various problems in directional millimeter-wave communication. In particular, we are focusing on stochastic characteristics of the underlying channel to characterize, detect, estimate, and track angular parameters of doubly directional millimeter-wave communication. For this purpose, we employ compressed sensing in combination with other stochastic methods such as Correlation Matrix Distance …
Date:
August 2022
Creator:
Robaei, Mohammadreza
System:
The UNT Digital Library
Photophysical Interactions in Vapor Synthesized and Mechanically Exfoliated Two-Dimensional Conducting Crystallites for Quantum and Optical Sensing
In the first study, superconducting 2D NbSe₂ was examined towards its prototypical demonstration as a transition-edge sensor, where photoexcitation caused a thermodynamic phase transition in NbSe₂ from the superconducting state to the normal state. The efficacy of the optical absorption was found to depend on the wavelength of the incoming radiation used, which ranged from the ultra-violet (405 nm), visible (660 nm), to the infrared (1060 nm). In the second case involving WSe₂, the UV-ozone treatment revealed the presence of localized excitonic emission in 1L WSe₂ that was robust and long-lived. Our third material platform dealt with hybrid 0D-2D ensembles based on graphene and WSe₂, specifically graphene–endohedral, WSe₂–fullerene (C₆₀), and WSe₂–Au nanoparticles, and exhibited exceptional performance gains achieved with both types of hybrid structures. Next, we investigated WSe₂ based mixed dimensional hybrids. Temperature T-dependent and wavelength λ-dependent optoelectronic transport measurements showed a shift in the spectral response of 1L WSe₂ towards the SPR peak locations of Au-Sp and Au-BP, fostered through the plexciton interactions. Models for the plexcitonic interactions are proposed that provide a framework for explaining the photoexcited hot charge carrier injection from AuNPs to WSe₂ and its influence on the carrier dynamics in these hybrid systems. Last, we …
Date:
August 2022
Creator:
Jayanand, Kishan
System:
The UNT Digital Library
Deep Learning Optimization and Acceleration
The novelty of this dissertation is the optimization and acceleration of deep neural networks aimed at real-time predictions with minimal energy consumption. It consists of cross-layer optimization, output directed dynamic quantization, and opportunistic near-data computation for deep neural network acceleration. On two datasets (CIFAR-10 and CIFAR-100), the proposed deep neural network optimization and acceleration frameworks are tested using a variety of Convolutional neural networks (e.g., LeNet-5, VGG-16, GoogLeNet, DenseNet, ResNet). Experimental results are promising when compared to other state-of-the-art deep neural network acceleration efforts in the literature.
Date:
August 2022
Creator:
Jiang, Beilei
System:
The UNT Digital Library
Developing Ultra-Fast Plasmonic Spiking Neuron via Integrated Photonics
This research provides a proof of concept and background theory for the physics behind the state-of-the-art ultra-fast plasmonic spiking neurons (PSN), which can serve as a primary synaptic device for developing a platform for fast neural computing. Such a plasmonic-powered computing system allows localized AI with ultra-fast operation speed. The designed architecture for a plasmonic spiking neuron (PSN) presented in this thesis is a photonic integrated nanodevice consisting of two electro-optic and optoelectronic active components and works based on their coupling. The electro-optic active structure incorporated a periodic array of seeded quantum nanorods sandwiched between two electrodes and positioned at a near-field distance from the topmost metal layer of a sub-wavelength metal-oxide multilayer metamaterial. Three of the metal layers of the metamaterials form the active optoelectronic component. The device operates based on the coupling of the two active components through optical complex modes supported by the multilayer and switching between two of them. Both action and resting potentials occur through subsequent quantum and extraordinary photonics phenomena. These phenomena include the generation of plasmonic high-k complex modes, switching between the modes by enhanced quantum-confined stark effect, decay of the plasmonic excitations in each metal layer into hot-electrons, and collecting hot-electrons by …
Date:
August 2022
Creator:
Goudarzi, Abbas, Sr.
System:
The UNT Digital Library