Digital Commons Network^™

Dynamics And Control In Spiking Neural Networks, Fuqiang Huang

McKelvey School of Engineering Theses & Dissertations

In the brain, neurons (brain cells) produce electrical impulses, or spikes, that are thought to be the substrate of information processing and computation. Through enigmatic processes, these spikes are ultimately decoded into perceptions and actions. The nature of this encoding and decoding is one of the most pervasive questions in theoretical neuroscience. In other words, what are the specific functions enacted by neural circuits, through their biophysics and dynamics? This thesis examines the dynamics of neural networks from the perspective of control theory and engineering. The pivotal concept is that of the normative synthesis of neural circuits, wherein neural dynamics …

Vision-Based Autonomous Tracking Of A Non-Cooperative Mobile Robot By A Low-Cost Quadrotor Vehicle, Cheikhna Ahmed Tidiane Sy

Electrical and Computer Engineering ETDs

The goal of this thesis is the detection and tracking of a ground vehicle, in particular a car-like robot, by a quadrotor. The first challenge to address in any pursuit or tracking scenario is the detection and unique identification of the target. From this first challenge, comes the need to precisely localize the target in a coordinate system that is common to the tracking and tracked vehicles. In most real-life scenarios, the tracked vehicle does not directly communicate information such as its position to the tracking one. From this fact, arises a non-cooperative constraint problem. The autonomous tracking aspect of …

Epidemiological Analysis Of Malaria Decrease In El Salvador From 1955 Until 2017, Tatiana I. Gardellini Guevara

USF Tampa Graduate Theses and Dissertations

The disease of malaria is complex, with clinical presentation that ranges from severe and complicated to mild and uncomplicated or even to asymptomatic malaria. A recent effort made by several world organizations has shown important advances in the effort to control and eradicate malaria. Following the general ordinance established by the trans-border organizations, each country has tried to define, according to their local geopolitical scenario, individual ¨road maps¨ to succeed in reducing the morbidity and mortality caused by malaria. Moreover, it is now accepted universally that these road maps need to be revised and appropriated in order to correct actions …

Phenomenological Study Of Toxic Leadership In The U.S. Military, Anthony L. Hinen

USF Tampa Graduate Theses and Dissertations

The current literature shows toxic leadership is surprisingly more prevalent than previously believed. This subset of organizational leadership studies revolves around leadership styles that poison the employee, the organization, or both. This study captures a common phenomenon for toxic leadership (symptoms) useful for diagnosing or addressing toxic leadership in organizations. My goal is to better understand toxic leadership to inform potential mitigation techniques that are applicable to business and military environments. My research suggests toxic leadership exists because senior leaders, those leaders above the toxic leader, allow it to exist, either unwittingly or knowingly. Furthermore, leaders can create toxic environments …

Optimal Direct Yaw Moment Control Of A 4wd Electric Vehicle, Winston James Wight

Master's Theses

This thesis is concerned with electronic stability of an all-wheel drive electric vehicle with independent motors mounted in each wheel. The additional controllability and speed permitted using independent motors can be exploited to improve the handling and stability of electric vehicles. In this thesis, these improvements arise from employing a direct yaw moment control (DYC) system that seeks to adapt the understeer gradient of the vehicle and achieve neutral steer by employing a supervisory controller and simultaneously tracking an ideal yaw rate and ideal sideslip angle. DYC enhances vehicle stability by generating a corrective yaw moment realized by a torque …

Implementación Sistema De Supervisión Y Control Para Los Módulos De Procesos, Miguel Angel Rojas Mahecha

Ingeniería en Automatización

En este trabajo se atiende a la necesidad de implementar un sistema de supervisión y control para las dos unidades de entrenamiento de procesos industriales de la Universidad de La Salle, las cuales están dotadas de sensores industriales de alta precisión y son utilizados en diferentes espacios académicos. Por lo tanto, se ofrece una herramienta educativa que permite llevar a cabo un cabo el diseño de diferentes técnicas de control que interactúan con las variables físicas de estos módulos. Para este fin, se empleó la sala de control y supervisión de procesos, junto con los dos módulos de entrenamiento, donde …

Virtual Model Of A Vehicle Adaptive Damper System, Kyle Hugo

Electronic Theses and Dissertations

Several FCA vehicles are fitted with semi-active damper systems which modulate the level of damping implemented in the vehicle suspension system to improve both the handling and ride quality felt by vehicle’s occupants. Durability simulations are necessary to analyze a vehicle’s or a component’s structural integrity over an expected lifespan. Performing durability simulations in a virtual environment has streamlined the traditional development cycle by reducing the need to construct physical prototypes and conduct physical road or bench tests. It is essential that the vehicle is modeled as accurately as possible in the virtual environment to ensure the results are representative …

An Application Of Sliding Mode Control To Model-Based Reinforcement Learning, Aaron Thomas Parisi

Master's Theses

The state-of-art model-free reinforcement learning algorithms can generate admissible controls for complicated systems with no prior knowledge of the system dynamics, so long as sufficient (oftentimes millions) of samples are available from the environ- ment. On the other hand, model-based reinforcement learning approaches seek to leverage known optimal or robust control to reinforcement learning tasks by mod- elling the system dynamics and applying well established control algorithms to the system model. Sliding-mode controllers are robust to system disturbance and modelling errors, and have been widely used for high-order nonlinear system control. This thesis studies the application of sliding mode control …

Control And Stability Of Upper Stage Launch Vehicle With Hybrid Arc-Ignition Attitude Control System, Steven Russell Bennett

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Utah State University Propulsion Research Laboratory (USUPRL) has recently made significant developments in the area of hybrid rocket systems. This type of propulsion system incorporates a solid fuel and a gas or liquid oxidizer. Hybrid rocket systems are known for their inherent safety, reliability, and restart capability. Over the last several years, the USUPRL has successfully built and tested a hybrid rocket system comprising acrylonitrile butadiene styrene (ABS) plastic and gaseous oxygen (GOX). The system was demonstrated to be fully functional during ground, vacuum, and sub-orbital flight testing. Continuing forward, the USUPRL endeavors to extend the capabilities of this …

Underwater Remotely Operated Vehicle Controller With Pid Stability Regulation, Christian E. Aguirre

Electrical Engineering

The earth’s oceans and rivers remain widely unexplored. Hobbyists and companies across the globe invest money and resources into remotely operated vehicles (ROV) to further expand underwater knowledge. Each ROV includes a controller that operates motors and monitors other crucial system vitals. The ROV Controller project makes the process of designing an ROV simpler and more affordable by providing a multi-purpose programmable controller.

The ROV controller features programmable digital inputs/outputs and analog inputs. The controller processes control signals from analog joysticks, digital signals from a gyroscope and utilizes a MUX to expand the analog input capabilities of the Arduino. The …

Leading The Play: Development Of A Method Supporting Expression And Control With Adults With Dementia, Victoria Green

Expressive Therapies Capstone Theses

This paper explores the concept of client-led play with older adults with dementia and its possible impact on an individual’s ability to express enjoyment and sense of control. Expressive arts therapy is explored as a possible natural vehicle for providing client-led play groups to older adults with dementia. While research is limited regarding client-led play specifically, there has been significant research supporting the use of the creative arts with individuals with dementia, as it provides opportunities for non-verbal expression and spontaneous creativity. This paper argues that the arts have a natural connection to play through the use of the imagination …

Physical Controllers Vs. Hand-And-Gesture Tracking: Evaluation Of Control Schemes For Vr Audio Mixing, Justin Bennington

Student Theses

Alternative control schemes for affecting the characteristics of audio signals have been designed and evaluated within the audio research community. The medium of virtual reality (VR) presents a unique method of sound source visualization using a headset which displays a virtual environment to the user, allowing users to directly control sound sources with minimal intermediary interference with a variety of different controllers. In order to provide insight into the design and evaluation of VR systems for audio mixing, the differences in subject preference between physical controllers and hand-and-gesture detection controls were investigated. A VR audio mixing interface was iteratively developed …

An Initial Development Of A Hardiness Scale For Elementary School Students, Stephen Ferrara

Educational Specialist, 2009-2019

There are limited studies that have investigated levels of hardiness in children. There is even less information on finding hardiness scales that have been normed on children in elementary school. The purpose of this study was to test the validity and reliability of the Hardiness Scale for Children (HSC), which assesses the three subscales of hardiness: Challenge, Control, and Commitment. 121 elementary school students (2^nd-5^th grade) were selected to complete the HSC. Their parents were also asked to complete a three-item scale to measure their child’s hardiness. The results indicated that older children tended to give themselves …

Modality, Control And Restructuring In Arabic, Yasser Albaty

Theses and Dissertations

The dissertation examines theories of modality and control with data from Standard Arabic (SA). In particular, I show that complementations of particular modal and control verbs in SA are not clausal, but smaller phrases. This challenges proposed accounts in the literature of modality in SA as well as theories of control within Minimalism. I alternatively argue for a novel account of both constructions that posits a monoclausal (i.e., restructuring) structure.

First, Chapter 2 investigates modality verbs in SA and shows that subjunctive complements of modality do not exhibit the properties of clausal complementation. I examine the syntax-semantics properties of modality …

H2 Control For Improved Stability Of Multi-Area Electric Power System With High Levels Of Inverter-Based Generation, Muthanna Abdulkareem Al-Sarray

Graduate Theses and Dissertations

Increased generation capacity from non-dispatchable energy resources such as wind and solar has created challenges to ensuring the reliable delivery of electric power. This research develops a systematic three-step method of assessing the reliability of electric power systems under a variety of different possible fault conditions to ensure that overall system stability is preserved in a manner the meets regulatory requirements. The first step is a risk-based reliability method (RBRM) that accounts for the probability of a line outage versus the severity of impact. This allows system planners to judiciously allocate expenses for reliability improvements based on the greatest economic …

Comparison Of Lqr And Lqr-Mrac For Linear Tractor-Trailer Model, Kevin Richard Gasik

Master's Theses

The United States trucking industry is immense. Employing over three million drivers and traveling to every city in the country. Semi-Trucks travel millions of miles each week and encompass roads that civilians travel on. These vehicles should be safe and allow efficient travel for all. Autonomous vehicles have been discussed in controls for many decades. Now fleets of autonomous vehicles are beginning their integration into society. The ability to create an autonomous system requires domain and system specific knowledge. Approaches to implement a fully autonomous vehicle have been developed using different techniques in control systems such as Kalman Filters, Neural …

Semantic-Based Access Control Mechanisms In Dynamic Environments, Mouiad A. Hani Al-Wahah

Theses and Dissertations

The appearance of dynamic distributed networks in early eighties of the last century has evoked technologies like pervasive systems, ubiquitous computing, ambient intelligence, and more recently, Internet of Things (IoT) to be developed. Moreover, sensing capabil- ities embedded in computing devices offer users the ability to share, retrieve, and update resources on anytime and anywhere basis. These resources (or data) constitute what is widely known as contextual information. In these systems, there is an association between a system and its environment and the system should always adapt to its ever-changing environment. This situation makes the Context-Based Access Control (CBAC) the …

Changes In Muscle Control And Coordination In Novel Task Learning, Sangsoo Park

Doctoral Dissertations

Learning many daily life motor skills is critical for survival and the quality of living in humans. As children, we develop walking and running patterns to move the body from point A to B without falling, and we learn to grasp a wide variety of objects during activities of daily living. Motor skills can be properly performed by appropriate muscle activations which are controlled by the central nervous system. How does the central nervous system develop and fine-tune its control strategy to learn a new motor skill? The aim of this dissertation was to better understand how human participants alter …

Basement Heart, Samantha Constance Tkac

Graduate Thesis Collection

Basement Heart is a collection of short stories with a goal of documenting the manifestations of rage and how it evolves throughout a woman’s life. In these stories, femininity is explored through the aesthetics of the grotesque. Female protagonists seek to inhabit new definitions of female sexuality that combat tired expectations made by society’s misogynistic and objectifying culture. Often, their feelings of unprovoked grief manifest themselves as pursuits of the flesh, which becomes the underlying heartbeat of each story; themes revolve around sex and obsession and explore what happens when sexual fantasies are realized and lived out in the real …

Simulation And Control At The Boundaries Between Humans And Assistive Robots, Holly E. Warner

ETD Archive

Human-machine interaction has become an important area of research as progress is made in the fields of rehabilitation robotics, powered prostheses, and advanced exercise machines. Adding to the advances in this area, a novel controller for a powered transfemoral prosthesis is introduced that requires limited tuning and explicitly considers energy regeneration. Results from a trial conducted with an individual with an amputation show self-powering operation for the prosthesis while concurrently attaining basic gait fidelity across varied walking speeds. Experience in prosthesis development revealed that, though every effort is made to ensure the safety of the human subject, limited testing of …

Control Strategy For A Small-Scale Microgrid Based On Battery Energy Storage System-Virtual Synchronous Generator (Bess-Vsg), Wei Gao

Electronic Theses and Dissertations

As one of widely deployed renewable energy resources, PV power is playing a very important role in microgrids today. It has advantages such as making the best of natural solar energy and being friendly to our environment. In this thesis, solar PV based microgrid is studied using modeling and simulation. Microgrid can run in either grid-connected-mode or islanded-mode. However, there are also some disadvantages for solar power. For solar panel, its output is influenced by weather conditions such as illumination intensity and temperature. In addition, during the control process of grid-connected mode, it is hard to guarantee its output power …

Very Superstitious: The Relationship Between Desperation And Superstitious Behavior, Christopher Evan Hannan

Murray State Theses and Dissertations

Superstitious behavior has been found to emerge during situations of uncertainty and often used by those who desire control. Desperation, a negative emotion that motivates behavior, tends to also occur in uncontrollable environments. This study attempts to analyze the possible relationship between desperation and the use of superstitious behavior in circumstances that leave individuals with little to no control. This was achieved by simulating an uncertain environment through a computerized card game involving chance (i.e. War). Results from this study demonstrated that those who felt desperate due to uncertainty engaged in superstitious behaviors, and desperation was a greater predictor for …

Culture, Power, And Control: A Discussion Of Autonomy And Responsibility, Loren A. Alonso

Honors Undergraduate Theses

The purpose of this thesis is to explore how power, control, autonomy, and responsibility are active participants in culture and daily human life. First, I discuss two understandings of power, structured and diffused. I examine some different techniques of power that help support and reproduce the current power systems in place and how historically, these systems have been predominantly unjust. I then discuss an alternative view of power that incorporates both structured and diffused forms of power. I explain why this new understanding of power could be more useful in actively shifting the current unjust power structures present in the …

Modeling Of Thermal Dynamics In Chevrolet Volt Gen Ii Hybrid Electric Vehicle For Integrated Powertrain And Hvac Optimal Operation Through Connectivity, Nehal Doshi

Dissertations, Master's Theses and Master's Reports

Integrated thermal energy management across system level components in electric vehicles (EVs) and hybrid electric vehicles (HEVs) is currently an under explored space. The proliferation of connected vehicles and accompanying infrastructure in recent years provides additional motivation to explore opportunities in optimizing thermal energy management in EVs and HEVs with the help of this newly available connected vehicle data. This thesis aims to examine and analyze the potential to mitigate vehicle energy consumption and extend usable driving range through optimal control strategies which exploit physical system dynamics via controls integration of vehicle subsystems.

In this study, data-driven and physics-based models …

Mandarin -Guo Under Control: An Experimental Study, Wei Zhou

Graduate Theses, Dissertations, and Problem Reports

This thesis examines the experiential aspectual marker -guo under control in Mandarin. The status of -guo under control has been a subject of controversy, involving two important theoretical questions. The first question concerns whether -guo under control is syntactically associated with the matrix verb or the embedded verb. The second question deals with whether, in terms of interpretive effects, -guo under control triggers actuality entailments. This thesis addresses the latter question through an interpretive judgment test conducted among 260 native Mandarin speakers. In the test, three control verbs (changshi ‘try’, guli ‘encourage’, and zuzhi ‘oppose’) were selected, each of …

Controlling Infectious Disease: Prevention And Intervention Through Multiscale Models, Adrienna N. Bingham

Dissertations, Theses, and Masters Projects

Controlling infectious disease spread and preventing disease onset are ongoing challenges, especially in the presence of newly emerging diseases. While vaccines have successfully eradicated smallpox and reduced occurrence of many diseases, there still exists challenges such as fear of vaccination, the cost and difficulty of transporting vaccines, and the ability of attenuated viruses to evolve, leading to instances such as vaccine derived poliovirus. Antibiotic resistance due to mistreatment of antibiotics and quickly evolving bacteria contributes to the difficulty of eradicating diseases such as tuberculosis. Additionally, bacteria and fungi are able to produce an extracellular matrix in biofilms that protects them …

Glycemic Control In A Type I Diabetic Athlete: Recommendations For Athletic Trainers In Management, Athlete Care, And Performance, Megan Whyte

University of the Pacific Theses and Dissertations

Type I diabetes in athletes is a relatively rare condition and as a certified athletic trainer it is critical to know how to manage all aspects of this disease in an athlete. Current National Athletic Trainers’ Association (NATA) guidelines exist for developing a basic plan for management and care of an athlete with Type I Diabetes, but there is room to improve current guidelines, using evidence-based practice. Purpose: to address: medical management of a type I diabetic athlete as a case study, obtain first person observations from the athlete’s perspective, and provide additional evidence based practice recommendations to athletic trainers …