Engineering Commons^™

Multilayered Transmission Lines, Antennas And Phased Arrays With Structurally Integrated Control Electronics Using Additive Manufacturing, Merve Kacar

USF Tampa Graduate Theses and Dissertations

This dissertation presents high-performance transmission lines, antennas, and phased arrays with novel packaging techniques by harnessing design flexibilities of additive manufacturing (AM). AM enables realizing multilayered RF electronics with complex geometrical structures that are not practical using conventional fabrication methods. Design flexibilities offered by AM as customized dielectric shapes/thicknesses, dielectric properties, metallization on conformal surfaces, and structural packaging are harnessed for multilayered RF applications. Although several works demonstrated the viability of AM for antenna realizations, its capability for addressing the needs of wideband, high radiation efficiency antenna systems packaged with active RF circuit components remains relatively unexplored. The first major …

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

USF Tampa 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 …

Cost Efficient Algorithms And Methods For Spectral Efficiency In Future Radio Access, Murat Karabacak

USF Tampa Graduate Theses and Dissertations

The growing interest in data-hungry wireless applications of mobile devices has led the cellular industry to look for new frequencies and new techniques for utilization of next-generation wireless technologies. As millimeter-wave (mmWave) communication becoming a promising solution, It can provide greater bandwidth and higher data rates in future radio access. While in the hostile environment of mmWave bands, the signals suffer from high propagation loss, the smaller wavelengths of mmWave frequencies make it possible to practically pack a large number of antennas with reasonable form factors. Thus, mmWave communication can provide directional transmission with high gain antenna arrays to penetrate …

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

USF Tampa 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 devices …

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

USF Tampa 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. …

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

USF Tampa 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 …

Spatial Stereo Sound Source Localization Optimization And Cnn Based Source Feature Recognition, Cong Xu

USF Tampa Graduate Theses and Dissertations

In the process of propagating as a carrier of information in space, in addition to transmitting the information itself, the acoustic signal also contains the position information of the sound source itself and its related physical characteristics. Acoustic signal uses the medium (such as air, water, steel, etc.) in the space to transmit mechanical vibration and longitudinal waves from the sound source to the outside world. The traditional single audio collection device cannot collect position information and sound source characteristic information. Therefore, the signals processed in the audio signal processing process are all mixed source acoustic signals after spatial reverberation. …

Analysis Of Computational Modeling Methods As Applied To Single-Crystal Organohalide Perovskites, Jon M. Bebeau

USF Tampa Graduate Theses and Dissertations

Perovskite, specifically MAPbI3, has exploded onto the electronic material forefront, with applications from photovoltaic to optical sensors. Still, there remain many unanswered questions about the electronic, structural and mechanical processes and properties of this perovskite. Computational software exists to model the electronic structure and material properties, to the nano scale, using density-functional theory. The goal of these models it to parallel the physical science of the substance in a computer simulation based on emerging mathematical models of the quantum mechanical behavior. In this study I review the historical use of perovskites in electronics, review the evolution of DFT algorithm developments …

Next-Generation Self-Organizing Communications Networks: Synergistic Application Of Machine Learning And User-Centric Technologies, Chetana V. Murudkar

USF Tampa Graduate Theses and Dissertations

The telecommunications industry is going through a metamorphic journey where the 5G and 6G technologies will be deeply rooted in the society forever altering how people access and use information. In support of this transformation, this dissertation proposes a fundamental paradigm shift in the design, performance assessment, and optimization of wireless communications networks developing the next-generation self-organizing communications networks with the synergistic application of machine learning and user-centric technologies.

This dissertation gives an overview of the concept of self-organizing networks (SONs), provides insight into the “hot” technology of machine learning (ML), and offers an intuitive understanding of the user-centric (UC) …

Implementation Of Sr Flip-Flop Based Puf On Fpga For Hardware Security, Sai Praneeth Sagi

USF Tampa Graduate Theses and Dissertations

Physical Unclonable Functions (PUF) are used for authentication and key generation to obtain a unique signature and are widely used in hardware security applications. In this work, we propose Set-Reset Flip-flop (SRFF) based PUF for FPGAs. We exploit the race around condition of the SRFF to obtain a one-bit signature output which is a function of feedback path delays. In deep sub-micron technology node, delay variations on an FPGA device are significant due to manufacturing process variations. Thus, an SRFF output value is a function of its location on the FPGA device. We implement registers of various bit widths and …

Electrospun Nanofibrous Membrane Based Glucose Sensor With Integration Of Potentiostat Circuit, Kavyashree Puttananjegowda

USF Tampa Graduate Theses and Dissertations

Although wearable and portable biomedical devices are the pillar of modern and smart societies, a large portion the device infrastructure is still under development, operates with poor monitoring and automation, and lacks sufficient communication among components. Moreover, demand for wearable bio-medical devices is expected to increase in the coming years. This situation presents a unique opportunity for electrical engineers to design novel strategies that allow point-of-care diagnostics to satisfy the increasing demand of wearable bio-medical devices. For example, in the medical field there is a rising diabetic population base, high demand for miniature and low-power diagnostic devices, and the need …

Theory, Fabrication, And Characterization Of Perovskite Phototransistor, Fatemeh Khorramshahi

USF Tampa Graduate Theses and Dissertations

In recent years, there has been a significant interest in making electronic devices with low-cost techniques and materials for both industrial and medical applications. Methylammonium lead iodide perovskite (MAPbI3) is one of the novel materials which has drawn much attention owing to its outstanding optical and electrical properties along with inexpensive, simple, and easy fabrication methods. In this work, the feasibility of using microfluidic device fabrication techniques on making a perovskite phototransistor has been studied. The fabrication method well addresses challenges such as lead toxicity and instability.

In the first step, mechanical micromachining and laser engraving were employed to make …

Comprehensive Optimization Models For Voltage Regulation In Pv-Rich Multi-Phase Distribution Systems, Ibrahim Alsaleh

USF Tampa Graduate Theses and Dissertations

The distribution systems are increasingly challenged by the continued prevalence of distributed energy resources (DERs), signaling the need for new computational tools to systemize their involvement, coordinate their operation with existing control devices, and mitigate undesired actuation of expensive equipment. Co-optimized operation of the various control devices becomes possible with the advancement in the power system optimization algorithms and the increased deployment of advanced metering infrastructure, offering system awareness and two-way communication. The steady-state alternating-current optimal power flow (ACOPF) problem, being the most descriptive form of OPF, lies at the root of power system optimization, aiming to minimize an operating …

Cancer Biomarker Detection In Human Plasma By Integrating Surface Acoustic Wave And Metal-Enhanced Fluorescence, Yuqi Huang

USF Tampa Graduate Theses and Dissertations

This thesis includes data and discussion about the technique of metal-enhanced fluorescence (MEF) to lower the detection limit of carcinoembryonic antigen (CEA). The detection limit goes down to 100pg/mL level when using MEF substrate made by rapid thermally annealed silver film covered by silica, which has great promise in diagnosing certain types of cancer that uses CEA as detection biomarker, such as pancreatic cancer and colon cancer. To further address the issue of background noises from non-specifically bound proteins (NSB) in complex media, such as plasma, serum, urine and blood, MEF is integrated with surface acoustic wave (SAW) streaming in …

Service Provisioning And Security Design In Software Defined Networks, Mohamed Rahouti

USF Tampa Graduate Theses and Dissertations

Information and Communications Technology (ICT) infrastructures and systems are being widely deployed to support a broad range of users and application scenarios. A key trend here is the emergence of many different "smart" technology paradigms along with an increasingly diverse array of networked sensors, e.g., for smart homes and buildings, intelligent transportation and autonomous systems, emergency response, remote health monitoring and telehealth, etc. As billions of these devices come online, ICT networks are being tasked with transferring increasing volumes of data to support intelligent real-time decision making and management. Indeed, many applications and services will have very stringent Quality of …

Investigation Of Navigation Systems For Size, Cost, And Mass Constrained Satellites, Omar Awad

USF Tampa Graduate Theses and Dissertations

The feasibility of using radically inexpensive micro-electromechanical system (MEMS) technology for navigation of a nanosatellite is investigated with a focus on attitude estimation. Typically, larger satellites are equipped with star cameras, sun sensors, or Earth horizon sensors for attitude estimation. These sensors can provide very accurate attitude measurements. A nanosatellite is highly size, power, and cost constrained and cannot readily accommodate these sensors. Our mission is to design, build, and operate a radically inexpensive nanosatellite system. While there is no consensus on what constitutes a "radically inexpensive" satellite, our goal is a maximum cost of $10,000 per unit. This precludes …

Socially Aware Network User Mobility Analysis And Novel Approaches On Aerial Mobile Wireless Network Deployment, Ismail Uluturk

USF Tampa Graduate Theses and Dissertations

Service demand patterns for wireless networks are evolving with the technological developments in areas such as personal computing, unmanned vehicles, and internet-of-things, where increasing mobile service demand is one of the significant challenges introduced. In addition to these new intrinsic dynamics, natural disasters and societal upheaval are also disrupting the conventional patterns of network demand. Situations like damaged infrastructure due to a natural disaster or large numbers of displaced people caused by political strife and social upheaval demand flexible, rapidly deployable network architectures. The increasing demands of next-generation communication services are straining the capabilities of the traditional approach of the …

Artificial Intelligence Towards The Wireless Channel Modeling Communications In 5g, Saud Mobark Aldossari

USF Tampa Graduate Theses and Dissertations

Channel prediction is a mathematical predicting of the natural propagation of the signal that helps the receiver to approximate the affected signal, which plays an important role in highly mobile or dynamic channels. The standard wireless communication channel modeling can be facilitated by either deterministic or stochastic channel methodologies. The deterministic approach is based on the electromagnetic theories and every single object in that environment has to be known in that propagation space and an example of this method is ray tracing. While the stochastic modeling method is based on measurements that involve statistical distributions of the channel parameters and …

Development Of A Monolithic Implantable Neural Interface From Cubic Silicon Carbide And Evaluation Of Its Mri Compatibility, Mohammad Beygi

USF Tampa Graduate Theses and Dissertations

One of the main issues with micron-sized intracortical neural interfaces (INIs) is their long-term reliability, with one major factor stemming from device material failure caused by the heterogeneous integration of multiple materials used to realize the implant. Single crystalline cubic silicon carbide (3C-SiC) is a semiconductor material that has been long recognized for its mechanical robustness and chemical inertness. It has the benefit of demonstrated biocompatibility, which makes it a promising candidate for chronically-stable, implantable INIs. In the first section of this dissertation, the fabrication and initial electrochemical characterization of a monolithic, Michigan-style 3C-SiC microelectrode array (MEA) probe is reported. …

Design Of Delro Autonomous Delivery Robot And Ai Based Localization, Tolga Karakurt

USF Tampa Graduate Theses and Dissertations

Autonomous robots are employed in numerous areas. In this thesis, it is proposed to design and build a self-controlled wheeled vehicle to deliver food.

As there are many applications of an autonomous agent for indoor and outdoor environments, this study is conducted on indoor settings whereas all the requirements and design processes are achieved for both operational boundaries.

The fundamental approach is to design and implement a Wheeled Mobile Robot (WMR), and to test skid-steering performance on proposed trajectories using a System Engineering approach. From this point of view, system requirements in mechanical, electrical, and software are evaluated, and overall …

Investigation Of Machine Learning Algorithms For Intrusion Detection System In Cybersecurity, Mohmmed Alrowaily

USF Tampa Graduate Theses and Dissertations

The proliferation in usage and complexity of modern communication and network systems, a large number of trustworthy online Services and systems have been deployed. Even so, cybersecurity threats are still growing. An Intrusion Detection System (IDS) play a vital role in ensuring the security of communication networks, and it is taken into account as the subsequent security gate after the firewall. The IDS informs the system or network administrator in order to take specific actions to evade the suspicious activities. Three significant contributions are made during the course of this research to illustrate the feasibility of these IDS approaches. In …

Enhancement Of 5g Network Performance Using Non-Orthogonal Multiple Access (Noma), Faeik Tayseer Al Rabee

USF Tampa Graduate Theses and Dissertations

This dissertation is composed of two parts. The first presents several approaches to enhance the performance of 5G wireless systems by using NOMA (Non-Orthogonal Multiple Access) as the multiple access technique under different scenarios and performance metrics. The second investigates the performance of a wireless system network using a mobility model to evaluate the channel capacity taking into account motion. Both studies are directed towards improving the system performance in wireless communication systems.

In the first part, the optimum received power level for uplink power-domain NOMA with ideal Successive Interference Cancellation (SIC) reception is derived for any number of transmitters. …

Trauma Detection Personal Locator Beacon System, Sakshi Sharma

USF Tampa Graduate Theses and Dissertations

This thesis details the development of an automatically-activated personal locator beacon system to facilitate search and rescue of injured users in remote locations. Trauma in the wilderness can result in brain injuries caused by falling from heights, the onset of bad weather condition, cardiological, pulmonary diseased condition, etc. This thesis initially describes the concept of a low-power trauma detection Personal Locator Beacon system and later focuses on detecting the traumatic condition, through four (4) physiological parameters: skin conductance, pulse oximeter, user movement via Freefall and activity/inactivity and impact detection, and finally body temperature. For these four physiological parameters respective sensor …

Performance Enhancement Techniques For Next-Generation Multi-Service Communication And Medical Cyber-Physical Systems, Ali Fatih Demir

USF Tampa Graduate Theses and Dissertations

Advances in science and technology have significantly improved our quality of life over the past decades. For example, wireless communication systems have evolved from basic voice services to delivering high-definition video for entertainment or business conferences at an accelerating pace. Furthermore, progress in cyber-physical systems has led to the development of brain-computer interfaces and wireless body area networks with the vision of advanced pervasive healthcare, anytime and anywhere. The primary motivation of this dissertation is to improve the performance of the next-generation multi-service communication and medical cyber-physical systems.

The research has been concentrated in physical (PHY)/medium access control (MAC) layer …

Reliability Analysis Of Power Grids And Its Interdependent Infrastructures: An Interaction Graph-Based Approach, Upama Nakarmi

USF Tampa Graduate Theses and Dissertations

Large blackouts with significant societal and economic impacts result from cascade of failures in the transmission network of power grids. Understanding and mitigating cascading failures in power grids is challenging due to the large number of components and their complex interactions, wherein, in addition to the physical topology of the system, the physics of power flow and functional dependencies among components largely affect the spatial distribution and propagation of failures. In this dissertation, data-driven interaction graphs, which help in capturing the underlying interactions and influences among the components during cascading failures, are used for capturing the non-local nature of propagation …

Microfluidically Reconfigurable Millimeter-Wave Switches, Antenna Arrays And Filters With Fast-Actuation Using Movable Metallized Plates And Integrated Actuation, Enrique J. Gonzalez Carvajal

USF Tampa Graduate Theses and Dissertations

Microfluidic reconfiguration of microwave devices has emerged as a potentially attractive alternative to integrated semiconductor (ICs/MMICs) and microelectromechanical systems (MEMS) based technologies. On the one hand, MMICs suffer from low power handling capabilities, high IL, non-linear effects, and elevated costs; on the other hand, MEMS are limited by their complex packaging requirements, and relatively low reliability from stiction-based effects. However, microfluidic reconfiguration provides low insertion loss (IL) due to its mechanical nature and it is not limited by power saturation effects. These attributes are especially valuable for applications at mm-waves, potentially reducing costs and increasing power efficiency capabilities. Microfluidic reconfiguration …

Algorithms Enabling Communications In The Presence Of Adjacent Channel Interference, Berker Peköz

USF Tampa Graduate Theses and Dissertations

Newer cellular communication generations are planned to allow asynchronous transmission of multiple numerologies (waveforms with different parameters) in adjacent bands, creating unavoidable adjacent channel interference (ACI). Contemporary windowed-orthogonal frequency division multiplexing (W-OFDM) algorithms have limited ACI rejection capability under high delay spread and small fast Fourier transformation (FFT) sizes. CP is designed to be longer than the maximum excess delay (MED) of the channel to accommodate such algorithms in current standards. Most prior work on windowing assume additional extensions reserved for windowing, which does

not comply with standards. The robustness of these algorithms can only be improved against these conditions …

Modeling And Control Of Renewable Energy In Grids And Microgrids, Yin Li

USF Tampa Graduate Theses and Dissertations

To save the non-renewable resources and reduce pollution emissions, the integration of renewable energy sources (RES) into the main grid is increasing very fast. However, power systems experience more stability issues that are caused by the higher penetration of RES. The main objectives of this dissertation are to 1-investigate these stability issues using linear analysis, EMT simulation results, and experiment results; 2-provide the suitable solutions with the evaluations. The research results will be presented into two parts based on two modeling approaches. In the first part, RES units are normally modeled as an aggregated power source for the investigation

because …