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Graduate Theses and Dissertations

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Full-Text Articles in Engineering

On The Application Of Recursive Nonlinear State Transformations And Nonlinear Feedback To Enable Continuous Thrust Spacecraft Orbital Rendezvous, Parisa Khosravi Apr 2021

On The Application Of Recursive Nonlinear State Transformations And Nonlinear Feedback To Enable Continuous Thrust Spacecraft Orbital Rendezvous, Parisa Khosravi

Graduate Theses and Dissertations

This dissertation presents a method to address exact feedback linearization problems based on the recursive application of approximate feedback linearization techniques. An approximate feedback linearization method is applied recursively to systems which are known to be an exact feedback linearizable to obtain a family of exact solutions up to the ρ-th degree utilizing the null space that appears as part of the computations. The coordinate transformation and feedback parameters are computed symbolically using a one-step approach in multi-stage form. This algorithm is algebraic and computationally simpler than solving the set of nonlinear partial differential equations. We employ the approximate feedback ...


Faculty Development And Interdisciplinary Partnerships: Supporting Change In Instructional Practice Of Engineering Faculty Members Through Professional Learning And Pedagogical Expertise, Rebecca D. Levison Jan 2021

Faculty Development And Interdisciplinary Partnerships: Supporting Change In Instructional Practice Of Engineering Faculty Members Through Professional Learning And Pedagogical Expertise, Rebecca D. Levison

Graduate Theses and Dissertations

A shortage of science and engineering professionals has led to an effort to engage and retain higher education students in science, technology, engineering, and mathematics (STEM) majors in the United States. School reformers call on faculty members to shift their teaching practices towards evidence-based instructional strategies that involve students in the learning process. Professional developers provide awareness of innovative strategies, but support during implementation is rare. This case study research examined how one unique professional learning partnership (PLP) between a School of Engineering and School of Education in the Pacific Northwest supported an instructional change.

Faculty members supported by the ...


Designing Next-Generation Transportation Systems With Emerging Vehicle Technologies, Zhiwei Chen Nov 2020

Designing Next-Generation Transportation Systems With Emerging Vehicle Technologies, Zhiwei Chen

Graduate Theses and Dissertations

Recent advances in computing and artificial intelligence have enabled the development of various emerging vehicle technologies, e.g., autonomous vehicles (AV) and modular autonomous vehicles (MAV). These technologies bring new scientific and engineering problems challenging transportation researchers and practitioners. This dissertation aims to develop a suite of scalable computational and analytical tools for designing and analyzing next-generation transportation systems with the MAV technologies. Also, we intend to empirically study the system impacts in terms of the quality of service, energy implications, and inequality impacts.

For MAV system design, we develop a methodological framework centering at theoretical properties of the optimal ...


Reading And Programming Spintronic Devices For Biomimetic Applications And Fault-Tolerant Memory Design, Kawsher Ahmed Roxy Nov 2020

Reading And Programming Spintronic Devices For Biomimetic Applications And Fault-Tolerant Memory Design, Kawsher Ahmed Roxy

Graduate Theses and Dissertations

Despite the triumph of conventional computing architectures till today, there emerges a lotof computing problems that are solved poorly by them. The reason behind this are twofold: i) the computing algorithm is incompetent in solving those problems, and ii) non-ideal effects of the traditional device technologies outperform the benets of using them. Hence, extensive research eorts have been put to devise novel algorithms as well as new devices. Among them spintronic devices demonstrate better performance in traditional architectures as well as offers way better solution to a lot of new problems when bundled with unconventional computing algorithms. Apart from being ...


Isolation Of Specific Phospholipids From Nannochloropsis Oculata Microalga For Cosmetic Applications, Ahmet Yener Manisali Nov 2020

Isolation Of Specific Phospholipids From Nannochloropsis Oculata Microalga For Cosmetic Applications, Ahmet Yener Manisali

Graduate Theses and Dissertations

Algae, photosynthetic aquatic organisms, have recently caught the attention of the food, cosmetic, pharmaceutical, and nutraceutical industries due to the variety of natural compounds in their cellular bodies such as carbohydrates, lipids, and proteins. Specifically, microalgae-derived natural compounds such as phospholipids are extensively utilized in cosmetics as part of liposome formers, emulsifiers, solubilizers, and wetting agents. Although phospholipids are currently extracted from food sources, this practice raises sustainability concerns. Hence, growing microalgae on the provision of macronutrients such as nitrates and phosphates will serve as a more sustainable source of the several specific phospholipids such as phosphatidylcholine (PC), phosphatidyl-ethanolamine (PE ...


Design And Implementation Of Solid/Solid Phononic Crystal Structures In Lateral Extensional Thin-Film Piezoelectric On Silicon Micromechanical Resonators, Abdulrahman Alsolami Nov 2020

Design And Implementation Of Solid/Solid Phononic Crystal Structures In Lateral Extensional Thin-Film Piezoelectric On Silicon Micromechanical Resonators, Abdulrahman Alsolami

Graduate Theses and Dissertations

Achieving high quality factor in MEMS resonator devices is a critical demand for today’s wireless communication and sensing technologies. In order to reach this goal, several dedicated prior works have been conducted based on published literature at different frequency ranges. Particularly, piezoelectrically transduced resonators, which are widely deployed in commercial wireless communication systems, could benefit from greatly improved qualify factor. So far, their development has evolved from thin film bulk acoustic resonators (FBAR’s) using surface attached piezoelectric thin-film transducers with moderate Q factors to high Q resonators equipped with a side-supporting tether (anchor) attached vibrating resonators that allow ...


The Utilization Of Shared Energy Storage In Energy Systems: Design, Modeling And Optimization, Rui Dai Nov 2020

The Utilization Of Shared Energy Storage In Energy Systems: Design, Modeling And Optimization, Rui Dai

Graduate Theses and Dissertations

Energy storage (ES) plays a significant role in modern smart grids and energy systems. With the advances of ES technologies, efficiently applying ES to energy systems has become the bottleneck for achieving the benefits of ES. The traditional approach of utilizing ES is the so-called distributed framework in which there is a separate ES for each individual user. Due to the inherent limits in the distributed framework such as cost inefficiency and space limitations, many studies have promoted to utilize a shared ES in energy systems to further exploit the potentials of ES. However, current studies always focus on maximizing ...


Opto-Fluidic Manipulation Of Microparticles And Related Applications, Hao Wang Nov 2020

Opto-Fluidic Manipulation Of Microparticles And Related Applications, Hao Wang

Graduate Theses and Dissertations

Contemporary biomedical technologies introduce many new instruments that are important for diagnosis and treatment of the patients. Instrument that can do rapid detection of bacterial infections, and further direct medical practitioner to prescribe optimal antibiotics is highly desirable. But unfortunately, this instrument is not available yet. Ideally, this instrument has to be portable to be used at point-of-care. This means it has to be small and inexpensive, but still highly accurate. Another critical requirement for the instrument is that the test results have to be available promptly. Because in case of such complications of bacterial infections as sepsis, each additional ...


Design And Implementation Of Intuitive Human-Robot Teleoperation Interfaces, Lei Wu Nov 2020

Design And Implementation Of Intuitive Human-Robot Teleoperation Interfaces, Lei Wu

Graduate Theses and Dissertations

We have designed and implemented a novel human-robot teleoperation interface based on an intuitive reference frame and hybrid inverse kinematics to perform activities of daily living(ADL) using multiple input devices.

Persons with disabilities often rely on caregivers or family members to assist in their daily living activities. Providing robotic assistants with easy and intuitive user interfaces to assist with ADL can improve their quality of life and lift some of the burdens on caregivers and family members. Current human-robot interface solutions, such as joysticks, Kinect based gesture recognition, and touchscreen-based solutions, including smartphones, are still far from being able ...


Coral Reef Restoration In The Tropical West Atlantic Amid The Covid-19 Pandemic, Linden Cheek Nov 2020

Coral Reef Restoration In The Tropical West Atlantic Amid The Covid-19 Pandemic, Linden Cheek

Graduate Theses and Dissertations

Climate change is increasing threats to coasts, both from storm surge and sea level rise. Healthy coral reefs provide reduction in storm surges, wave energy, coastal flooding and everyday erosion, and are found across a variety of spatial scales. Given the state of coral reefs worldwide, active Coral Reef Restoration (CRR) in emerging as a necessary component of coastal protection. CRR can be classified as a nature-based solutions (NbS) for coastal protection that also provides a multitude of ecosystem-based services to both humans and other life. Nearly all literature on coral restoration efforts assume a steady-state of human-ecological interactions, but ...


Hybrid Rf Acoustic Resonators And Arrays With Integrated Capacitive And Piezoelectric Transducers, Adnan Zaman Nov 2020

Hybrid Rf Acoustic Resonators And Arrays With Integrated Capacitive And Piezoelectric Transducers, Adnan Zaman

Graduate Theses and Dissertations

Over the past few decades, the usage of mobile communication devices such as smartphones, laptop computers, tablets has grown significantly. Clearly, smartphones and other mobile gadgets have been leading the current and emerging market thanks to the fast growing of wireless communications. Therefore, the wireless communications market is constantly looking for new ways to miniaturize the RF front-ends, while reducing the size, cost, and power consumption. Radio frequency microelectromechanical systems (RF MEMS) is widely viewed as a potential enabling technology for the multi-standard monolithic transceivers on a single chip with high reliability, high performance, and very low DC power consumption ...


Laser-Induced Modifications In Two-Dimensional Materials, Tariq Afaneh Nov 2020

Laser-Induced Modifications In Two-Dimensional Materials, Tariq Afaneh

Graduate Theses and Dissertations

Atomically thin two-dimensional (2D) materials have attracted a growing interest in the lastdecade from the fundamental point of view as well as their potential applications in functional devices. Due to their high surface-to-volume ratio, the physical properties of 2D materials are very sensitive to the environmental factor such as surrounding media and illumination conditions (e.g. light-mater interaction). In the first part of this dissertation I will present recent advances in developing laser-assisted methods to tune the physical properties of 2D transition metal dichalcogenides (TMDs). We demonstrate laser-assisted chemical modification ultrathin TMDs, locally replacing selenium by sulfur atoms. The photo-conversion ...


Efficient Neural Architecture Search With Multiobjective Evolutionary Optimization, Maria Gabriela Baldeón Calisto Nov 2020

Efficient Neural Architecture Search With Multiobjective Evolutionary Optimization, Maria Gabriela Baldeón Calisto

Graduate Theses and Dissertations

Deep neural networks have become very successful at solving many complex tasks such as image classification, image segmentation, and speech recognition. These models are composed of multiple layers that have the capacity to learn increasingly higher-level features, without prior handcrafted specifications. However, the success of a deep neural network relies on finding the proper configuration for the task in hand. Given the vast number of hyperparameters and the massive search space, manually designing or fine-tuning deep learning architectures requires extensive knowledge, time, and computational resources.

There is a growing interest in developing methods that automatically design a neural network´s ...


Architecture Design And Optimization Of Edge-Enabled Smart Grids, Adetola B. Adeniran Oct 2020

Architecture Design And Optimization Of Edge-Enabled Smart Grids, Adetola B. Adeniran

Graduate Theses and Dissertations

The emergence of modern monitoring, communication, computation, and controlequipment into power systems has made them evolve into smart grids that can be thought of as the electric grid of things. This evolution has enhanced the efficiency of the power systems through the availability of a large volume of system data that can help with system functions, nevertheless, it has intensified the communication and computation burden on these systems. While many of such computations were traditionally deployed in central servers, new technologies such as edge computing can provide unique opportunities to address some of the computational challenges and improve the responsiveness ...


Use Of Sugarcane Bagasse Ash As Partial Cement Replacement In Interlocking Stabilized Soil Blocks (Issbs), Adah Shair Oct 2020

Use Of Sugarcane Bagasse Ash As Partial Cement Replacement In Interlocking Stabilized Soil Blocks (Issbs), Adah Shair

Graduate Theses and Dissertations

Global infrastructure needs for adequate housing, water provision and improved sanitation are on the rise. UN-Water estimates that 1 in 3 people still lack access to safe drinking water and about 4.2 billion people across the globe lack access to safely managed sanitation services. Rapid urbanization and the global refugee crisis have also increased the demand for adequate and efficient housing. UN Sustainable Development Goals cannot be achieved until these needs are met. Given the high environmental impact and cost of cement-heavy construction, alternate construction techniques like appropriate earth technologies need to be adopted. Interlocking stabilized soil blocks (ISSBs ...


Strength Restoration Of Corrosion Damaged Piles Repaired With Carbon Fiber Reinforced Polymer Systems, Jethro Clarke Oct 2020

Strength Restoration Of Corrosion Damaged Piles Repaired With Carbon Fiber Reinforced Polymer Systems, Jethro Clarke

Graduate Theses and Dissertations

Of the 12,741 bridges accounted for by the Florida Department of Transportation (FDOT), approximately 50% were built between the 1950s and 1960s. During this period, bridges were typically constructed in coastal environments using pile bents. Now, the main threat to bridges in these environments is corrosion, which occurs in the splash zones of most bridge piles. These zones contain high concentrations of chlorides, oxygen and moisture, the corner stones of a highly corrosive environment. Corrosion compromises steel reinforcement in these areas leading to cracking, spalling and an inevitable loss of capacity.

In recent years, significant strides have been made ...


Control Of A Human Arm Robotic Unit Using Augmented Reality And Optimized Kinematics, Carlo Canezo Oct 2020

Control Of A Human Arm Robotic Unit Using Augmented Reality And Optimized Kinematics, Carlo Canezo

Graduate Theses and Dissertations

There are more than 350000 amputees in the US who suffer loss of functionality in their daily living activities, and roughly 100000 of them are upper arm amputees. Many of these amputees use prostheses to compensate part of their lost arm function, including power prostheses. Research on 6-7 degree of freedom powered prostheses is still relatively new, and most commercially available powered prostheses are typically limited to 1 to 3 degrees of freedom. Due to the myriad of possible options for various powered protheses from different manufacturers, each configuration is governed by a distinct control scheme typically specific to the ...


An Inferential Study Of The Potential Consumer Value Of Free Charging For Users Of Public Electric Vehicle Charging Infrastructure, Divyamitra Mishra Oct 2020

An Inferential Study Of The Potential Consumer Value Of Free Charging For Users Of Public Electric Vehicle Charging Infrastructure, Divyamitra Mishra

Graduate Theses and Dissertations

Although there is economic and marketing evidence of consumers assigning additional benefits to free products and bundles, there is limited research into the behavioral consequences of offering public electric vehicle charging for free. Previous exploratory research by Maness and Lin analyzed possible economic and environmental benefits from offering free public charging infrastructure and policy. Their work found that providing free public charging infrastructure could increase plug-in electric vehicle sales and cause decreased reliance on fossil fuels in the personal transportation sector. However, their study assumed the increased value which consumers would place on free charge events. This project proposes to ...


Detecting Symptoms Of Chronic Obstructive Pulmonary Disease And Congestive Heart Failure Via Cough And Wheezing Sounds Using Smart-Phones And Machine Learning, Anthony Windmon Sep 2020

Detecting Symptoms Of Chronic Obstructive Pulmonary Disease And Congestive Heart Failure Via Cough And Wheezing Sounds Using Smart-Phones And Machine Learning, Anthony Windmon

Graduate Theses and Dissertations

Chronic Obstructive Pulmonary Disease (COPD) and Congestive Heart Failure (CHF) are progressive disorders, and major health concerns among today’s aging population. COPD causes a large mucus buildup in the lungs, leading to chronic cough and difficulty to breathe. CHF causes fluid buildup in the lower lungs due to the failing heart, causing cough and difficulty to breath. People who are clinically diagnosed with COPD or CHF are expected to regularly monitor their symptoms and follow complex medical recommendations in an effort to prevent exacerbation. In this dissertation, we elaborate upon three different machine learning based techniques that we developed ...


Using A Systems Thinking Approach And Health Risk Assessment To Analyze The Food-Energy-Water System Nexus Of Seaweed Farming In Belize, Estenia J. Ortiz Carabantes Jul 2020

Using A Systems Thinking Approach And Health Risk Assessment To Analyze The Food-Energy-Water System Nexus Of Seaweed Farming In Belize, Estenia J. Ortiz Carabantes

Graduate Theses and Dissertations

Certain macroalgae, commonly referred to as seaweed, have traditionally been used as a food source for many coastal communities around the world. In Belize, residents of the Placencia Peninsula cultivate two seaweed types, Eucheuma isiforme and Gracilaria spp. at Little Water Caye located 19 miles offshore. The dried seaweed is sold at the Placencia Producers Cooperative Society Limited (PPCSL) where community members process it into a variety of value-added products such as soaps, cosmetics, hair products, and food additives.

The overall goal of this research was to understand the existing food-energy-water system (FEWS) infrastructure landscape for seaweed production in Placencia ...


Distributed Control Of Multiagent Systems Under Heterogeneity, Selahattin Burak Sarsilmaz Jul 2020

Distributed Control Of Multiagent Systems Under Heterogeneity, Selahattin Burak Sarsilmaz

Graduate Theses and Dissertations

The overarching objective of this work is to propose solutions to quite a few distributed control problems arising from networks of heterogeneous agents or the heterogeneous nature of multiagent systems. Each problem with its solutions is concisely summarized below.

We consider the cooperative output regulation problem of heterogeneous linear multiagent systems over fixed directed communication graphs. The purpose of this problem is to design a distributed control law such that the overall closed-loop stability is ensured and the tracking error of each agent converges to zero asymptotically for a class of reference inputs and disturbances generated by a so-called exosystem ...


Using Optimization Methods For Solving Problems In Sustainable Urban Mobility And Conservation Planning, Zulqarnain Haider Jul 2020

Using Optimization Methods For Solving Problems In Sustainable Urban Mobility And Conservation Planning, Zulqarnain Haider

Graduate Theses and Dissertations

This dissertation considers three separate optimization problems related to sustainable urban and environmental systems. The first problem relates to the nightly relocation and recharging operations for Free-floating electric vehicle sharing (FFEVS) systems. Such operations involve a crew of drivers to move the shared electric vehicles (EVs), and a fleet of shuttles to transport those drivers. Mixed integer programs are used to model the relocation and recharging operations. Two approaches are devised: sequential and synchronized approaches. In the sequential approach, the movement of EVs is first decided, then the routing of shuttles and drivers is determined. In the synchronized approach, all ...


Machine Learning For The Internet Of Things: Applications, Implementation, And Security, Vishalini Laguduva Ramnath Jul 2020

Machine Learning For The Internet Of Things: Applications, Implementation, And Security, Vishalini Laguduva Ramnath

Graduate Theses and Dissertations

Artificial intelligence and ubiquitous sensor systems have seen tremendous advances in recent times, resulting in groundbreaking impact across domains such as healthcare, entertainment, and transportation through a collective ecosystem called the Internet of Things. The advent of 5G and improved wireless networks will further accelerate the research and development of tools in deep learning, sensor systems, and computing platforms by providing improved network latency and bandwidth. While tremendous progress has been made in the Internet of Things, current work has largely focused on building robust applications that leverage the data collected through ubiquitous sensor nodes to provide actionable rules and ...


Relational Joins On Gpus For In-Memory Database Query Processing, Ran Rui Jun 2020

Relational Joins On Gpus For In-Memory Database Query Processing, Ran Rui

Graduate Theses and Dissertations

Relational join processing is one of the core functionalities in database management systems. Implementing join algorithms on parallel platforms, especially modern GPUs, has gain a lot of momentum in the past decade. This dissertation addresses the following issues on GPU join algorithms. First, we present empirical evaluations of a state-of-the-art work on GPU-based join processing. Since 2008, the compute capabilities of GPUs have increased following a pace faster than that of the multi-core CPUs. We run a comprehensive set of experiments to study how join operations can benefit from such rapid expansion of GPU capabilities. We also present improved GPU ...


Active Deep Learning Method To Automate Unbiased Stereology Cell Counting, Saeed Alahmari Jun 2020

Active Deep Learning Method To Automate Unbiased Stereology Cell Counting, Saeed Alahmari

Graduate Theses and Dissertations

Cell quantification in histopathology images plays a significant role in understanding and diagnosing diseases such as cancer and Alzheimers. The gold-standard for quantifying cells in tissue sections is the unbiased stereology approach. Unfortunately, in unbiased stereology current practices rely on a well-trained human to manually count hundreds of cells in microscopy images. However, this human-based manual approach is time-consuming, labor-intensive, subject to human errors, recognition bias, fatigue, variable training, poor reproducibility, and inter-observer error. Thus, the lack of high-throughput technology for automating unbiased stereology analyses remains a major obstacle to further progress in a wide range of neuroscience and cancer ...


Structural And Agricultural Value At Risk In Florida From Flooding During Hurricane Irma, Alexander J. Miller Jun 2020

Structural And Agricultural Value At Risk In Florida From Flooding During Hurricane Irma, Alexander J. Miller

Graduate Theses and Dissertations

Flooding is the most costly type of natural disaster, as well as the most frequent. To provide risk-based flood insurance, providers such as FEMA must be able to accurately determine an asset’s risk of flooding. Additionally, after a flooding event, providers need to quickly determine the direct damages that occurred to verify insurance claims and provide assistance to the affected communities. Many current approaches to flood risk and flood damage estimation involve the use of data or statistical extrapolation that can add various sources of uncertainty into the final damage estimate. In order to reduce uncertainties in flood risk ...


Additive Manufactured And Laser Enhanced Optical Fiber On Flexible Kapton Substrate, Dianhao Hou Jun 2020

Additive Manufactured And Laser Enhanced Optical Fiber On Flexible Kapton Substrate, Dianhao Hou

Graduate Theses and Dissertations

This thesis mainly focuses on the realization of laser enhancing additive manufactured optical fibers on the flexible substrate based on previous work on the rigid surface, and the exploration of their loss at different bend status by optical transmission test. Optical fibers are successfully fabricated using polymethyl methacrylate by fused deposition modeling technology within Norland Optical Adhesive 1369 which is chosen as the cladding material and micro-dispensed on the Kapton substrate. The Laser cutting technology and scanning electron microscope have been used to enhance and characterize the flatness of two end facets of samples, respectively. The optical adhesive and PMMA ...


Van Der Waals Epitaxy Of Ultrathin Early Transition Metal (Ti & V) (Di)Selenides: Charge And Magnetic Order In The Ultrathin Limit, Manuel Bonilla Lopez Jun 2020

Van Der Waals Epitaxy Of Ultrathin Early Transition Metal (Ti & V) (Di)Selenides: Charge And Magnetic Order In The Ultrathin Limit, Manuel Bonilla Lopez

Graduate Theses and Dissertations

Since the isolation of graphene in 2004, two-dimensional (2D) layered materials, specially the transition metal dichalcogenides (TMDs), have attracted immense interest from theoreticians and experimentalist due to the diversity of properties presented in this family of materials. The main reason for the interest in such materials has been the observation of emergent properties as a consequence of the reduced dimensions, i.e. the monolayer regime. Initially the monolayer regime was obtained via the scotch-tape method. The implementation of exfoliation techniques was successful since layered 2D materials are composed of stacked layers held together by weak van der Walls forces that ...


Managing Off-Grid Power Use For Solar Fueled Residences With Smart Appliances, Prices-To-Devices And Iot, Donnelle L. January Jun 2020

Managing Off-Grid Power Use For Solar Fueled Residences With Smart Appliances, Prices-To-Devices And Iot, Donnelle L. January

Graduate Theses and Dissertations

Electricity availability has a profound impact in day to day life. Activities such as lighting homes, charging cellphones, and running appliances all depend on electricity use. Around 1 billion people around the world do not have access to electricity, and the majority of these people hail from developing countries in remote areas. Moreover, many of these remote areas lack utility grid access due to the infeasible cost of extending the grid to remote communities. To combat this, various projects on microgrids have been implemented in order to distribute power to these off-grid areas. Nanogrids are defined as “a single domain ...


Water Quality And Sustainability Assessment Of Rural Water Systems In The Comarca Ngäbe-Buglé, Panama, Corbyn Cools Jun 2020

Water Quality And Sustainability Assessment Of Rural Water Systems In The Comarca Ngäbe-Buglé, Panama, Corbyn Cools

Graduate Theses and Dissertations

Over the last four decades significant progress has been made on providing people access to improved drinking water. The Joint Monitoring Program (JMP) estimates that 6.7 billion people have access to at least basic drinking water services. In spite of this great achievement 785 million people still lack even basic services and eighty percent of which live in rural areas. To further complicate matters, those with access to services experience interruptions or non-functionality for handpumps and piped system long before the intended design life of the system. In the Comarca Ngäbe-Buglé province in Panama there is very little information ...