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Electrical and Computer Engineering Faculty Research & Creative Works

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Full-Text Articles in Engineering

A Novel Reduced-Order Method For Analysis Of Hyperspectral Images, Yanming Zhang, Lijun Jiang Oct 2021

A Novel Reduced-Order Method For Analysis Of Hyperspectral Images, Yanming Zhang, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Hyperspectral imaging technology has been broadly applied in remote sensing because it collects echoed signals from across the electromagnetic (EM) spectrum and provides fruitfully helpful information. However, the processing or transformation of high-data-volume hyperspectral images, also viewed as snapshots varying with the EM spectrum, burdens the hardware resources, especially for the high spectral resolution and spatial resolution cases. To tackle this challenge, a novel reduced-order method based on the dynamic mode decomposition (DMD) algorithm is presented here to analyze hyperspectral images. The method decomposes the spatial-spectral hyperspectral images in terms of spatial dynamic modes and corresponding spectral patterns. Then, these …

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Nonvolatile Resistive Switching Memory Based On Monosaccharide Fructose Film, Yuan Xing, Brandon Sueoka, Kuan Yew Cheong, Feng Zhao Oct 2021

Nonvolatile Resistive Switching Memory Based On Monosaccharide Fructose Film, Yuan Xing, Brandon Sueoka, Kuan Yew Cheong, Feng Zhao

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, we report resistive random-access memory (RRAM) based on a monosaccharide—fructose for nonvolatile memory in biocompatible and "green" electronics. Fructose thin film acts as the resistive switching layer with Al and Ag top electrodes for comparison. Both devices demonstrated highly reproducible nonvolatile bipolar resistive switching behaviors with a large on/off ratio of ∼106 for the Al electrode and ∼105 for the Ag electrode. The forming voltage, set voltage, and memory window are also larger for the Al electrode than the Ag electrode, but the reset voltages are comparable. Dominant conduction mechanisms of fructose films were proposed. …

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Open-Ended Hollow Coaxial Cable Resonator Sensor, Jie Huang, Chen Zhu, Rex E. Gerald Ii Oct 2021

Open-Ended Hollow Coaxial Cable Resonator Sensor, Jie Huang, Chen Zhu, Rex E. Gerald Ii

Electrical and Computer Engineering Faculty Research & Creative Works

An open-ended hollow coaxial cable resonator probe configured to receive an aerosol sample for analysis. A metal post shorts the resonator's inner and outer conductors. A metal plate is spaced apart from an open end of the resonator by a dielectric layer that contains the received aerosol sample. Interrogator circuitry coupled to the resonator transmits an electromagnetic wave within the resonator and generates an electric field at the open end of the resonator. The interrogator circuitry is responsive to the generated electric field for determining a resonance frequency and an impedance of the resonator when the aerosol sample is present …

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Evolutionary Algorithm-Based Adaptive Robust Optimization For Ac Security Constrained Unit Commitment Considering Renewable Energy Sources And Shunt Facts Devices, Aliasghar Baziar, Rui Bo, Misagh Dehghani Ghotbabadi, Mehdi Veisi, Waqas Ur Rehman Sep 2021

Evolutionary Algorithm-Based Adaptive Robust Optimization For Ac Security Constrained Unit Commitment Considering Renewable Energy Sources And Shunt Facts Devices, Aliasghar Baziar, Rui Bo, Misagh Dehghani Ghotbabadi, Mehdi Veisi, Waqas Ur Rehman

Electrical and Computer Engineering Faculty Research & Creative Works

An AC security constrained unit commitment (AC-SCUC) in the presence of the renewable energy sources (RESs) and shunt flexible AC transmission system (FACTS) devices is conventionally modeled as a deterministic optimization problem to minimize the operation cost of conventional generation units (CGUs) subject to AC optimal power flow (AC-OPF) equations, operation constraints of RESs, shunt FACTS devices, and CGUs. To cope with the uncertainties of load and RES generation, robust and stochastic optimization and linearized formulation have been used to achieve a sub-optimal solution. To arrive at a more optimal solution, an evolutionary algorithm-based adaptive robust optimization (EA-ARO) approach to …

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Developing Robust Bidding Strategy For Virtual Bidders In Day-Ahead Electricity Markets, Hossein Mehdipourpicha, Siyuan Wang, Rui Bo Sep 2021

Developing Robust Bidding Strategy For Virtual Bidders In Day-Ahead Electricity Markets, Hossein Mehdipourpicha, Siyuan Wang, Rui Bo

Electrical and Computer Engineering Faculty Research & Creative Works

Purely financial players without any physical assets can participate in day-Ahead electricity markets as virtual bidders. They can arbitrage the price difference between day-Ahead (DA) and real-Time (RT) markets to maximize profits. Virtual bidders encounter various monetary risks and uncertainties in their decision-making due to the high volatility of the price difference. Therefore, this paper proposes a max-min two-level optimization model to derive the optimal bidding strategy of virtual bidders. In this model, the risks of uncertainties associated with the rivals' strategies and RT market prices are managed by robust optimization. The proposed max-min two-level model is turned into a …

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Secure Communication In A Multi-Antenna Wiretap Channel With A Reconfigurable Intelligent Surface, Mohamed Nafea, Aylin Yener Sep 2021

Secure Communication In A Multi-Antenna Wiretap Channel With A Reconfigurable Intelligent Surface, Mohamed Nafea, Aylin Yener

Electrical and Computer Engineering Faculty Research & Creative Works

Reconfigurable Intelligent Surfaces (RIS) are being considered as a candidate technology for next generation of wireless systems (6G), for improving reliability and range extension owing to their low cost and complexity, and suitability for high-frequency schemes. RIS terminals can effectively operate as relaying nodes for transmitted signals, while saving the energy needed for Radio Frequency (RF) transmission. This is implemented by deploying controllable reflecting arrays of meta-surface elements, whose phase can be adjusted by applying fast switching voltage. RIS thus creates a valuable resource in wireless communication: the control over the channel realizations from the RIS relays to the receiver. …

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Comparative Study Of Hermitian And Non-Hermitian Topological Dielectric Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Shuang Zhang, Ran Zhao, Zhihao Lan, Wei E.I. Sha Sep 2021

Comparative Study Of Hermitian And Non-Hermitian Topological Dielectric Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Shuang Zhang, Ran Zhao, Zhihao Lan, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

The effects of gain and loss on the band structures of a bulk topological dielectric photonic crystal (PC) with C6v symmetry and the PC-air-PC interface are studied based on first-principal calculation. To illustrate the importance of parity-time (PT) symmetry, three systems are considered, namely the PT-symmetric, PT-asymmetric, and lossy systems. We find that the system with gain and loss distributed in a PT symmetric manner exhibits a phase transition from a PT exact phase to a PT broken phase as the strength of the gain and loss increases, while for the PT-asymmetric and lossy systems, no such phase transition occurs. …

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Physical-Based Training Data Collection Approach For Data-Driven Lithium-Ion Battery State-Of-Charge Prediction, Jie Li, Will Ziehm, Jonathan W. Kimball, Robert Landers, Jonghyun Park Sep 2021

Physical-Based Training Data Collection Approach For Data-Driven Lithium-Ion Battery State-Of-Charge Prediction, Jie Li, Will Ziehm, Jonathan W. Kimball, Robert Landers, Jonghyun Park

Electrical and Computer Engineering Faculty Research & Creative Works

Data-Driven approaches for State of Charge (SOC) prediction have been developed considerably in recent years. However, determining the appropriate training dataset is still a challenge for model development and validation due to the considerably varieties of lithium-ion batteries in terms of material, types of battery cells, and operation conditions. This work focuses on optimization of the training data set by using simple measurable data sets, which is important for the accuracy of predictions, reduction of training time, and application to online estimation. It is found that a randomly generated data set can be effectively used for the training data set, …

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Resistive Switching Properties Of Zro2 Film By Plasma-Enhanced Atomic Layer Deposition For Non-Volatile Memory Applications, Aleksey A. Sivkov, Yuan Xing, Zoe Minden, Zhigang Xiao, Kuan Yew Cheong, Feng Zhao Sep 2021

Resistive Switching Properties Of Zro2 Film By Plasma-Enhanced Atomic Layer Deposition For Non-Volatile Memory Applications, Aleksey A. Sivkov, Yuan Xing, Zoe Minden, Zhigang Xiao, Kuan Yew Cheong, Feng Zhao

Electrical and Computer Engineering Faculty Research & Creative Works

Resistive switching properties of nanoscale zirconium dioxide (ZrO2) thin film deposited by plasma-enhanced atomic layer deposition (PE-ALD) have been investigated. A resistive memory device has been formed with a 10-nm-thick ZrO2 film as an active switching layer sandwiched between an aluminum top electrode and a silver bottom electrode. Bipolar resistive switching characteristics were demonstrated by current–voltage measurements with a read memory window of 6.6 V, an ON/OFF current ratio of nearly 105 , and a retention time of 104 s. Current conduction at low resistance states follows Ohm's law while at a high-resistance state governed …

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New Infeed Correction Methods For Distance Protection In Distribution Systems, Fahd Hariri, Mariesa Crow Aug 2021

New Infeed Correction Methods For Distance Protection In Distribution Systems, Fahd Hariri, Mariesa Crow

Electrical and Computer Engineering Faculty Research & Creative Works

The reliability and security of power systems may be jeopardized by the increase in the amounts of renewable generation and the uncertainties produced by these devices. In particular, the protection schemes of traditional power systems have been challenged by the integration of distributed generation (DG) resources. Distance relays (DRs), which have been mainly employed to protect transmission systems, are increasingly proposed as one of the solutions to protect distribution systems with a heavy penetration of DGs. However, conventional distance protection faces several drawbacks that might lead to maloperation. One of those challenges is the "infeed effect", which causes the impedance …

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Tunable Topological Photonic Crystal Waveguides, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha Jul 2021

Tunable Topological Photonic Crystal Waveguides, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

Edge states in topological photonic systems have the robust unidirectional propagation feature which originates from the topological nature of the bulk band dispersion. In this work, we propose a topological photonic crystal (PC) waveguide that is formed by introducing an air gap in an all-dielectric PC with C-{6v} symmetry. The dispersion of the line defect states is tunable by varying the width of the air gap. Based on their field distributions, the states can be classified into even- and odd-symmetric states. The even-symmetric states are found to be the nontrivial topological edge states and exhibit pseudospin-locking unidirectional propagation property. By …

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Improvement Of Spice Based Esd Protection Models For I/O Protection Modeling, Amin Pak, Seyed Mostafa Mousavi, David Pommerenke, Giorgi Maghlakelidze, Yang Xu Jul 2021

Improvement Of Spice Based Esd Protection Models For I/O Protection Modeling, Amin Pak, Seyed Mostafa Mousavi, David Pommerenke, Giorgi Maghlakelidze, Yang Xu

Electrical and Computer Engineering Faculty Research & Creative Works

Modeling ESD protection using the System Efficient ESD Design (SEED) methodology enables optimal protection of an IO using TVS and external components. The success of modeling depends on the accuracy of the models. This work shows improvements to SPICE models used to characterize TVS diodes and IC I/O. The improvement is twofold. The transition phases between snapback and main current flow have been adjusted to achieve realistic waveforms for the rise times from 500 ps to 5 ns in a voltage range from Vt1 to the high current region, and complex curvatures of the IV curve are included. The model …

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Data-Driven Discovery Of The Governing Equation For The Transmission Lines System, Yanming Zhang, Lijun Jiang Jul 2021

Data-Driven Discovery Of The Governing Equation For The Transmission Lines System, Yanming Zhang, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Sophisticated structures in the transmission line system introduce the nonuniformity and nonlinearity, which brings the challenge for its characterization and modeling. In this work, a novel data-driven method is proposed to derive the governing partial differential equations of the transmission line. Based on the polynomial interpolation of the spatial-temporal samples of current and voltage, the time and spatial derivatives can be obtained. Then, the ridge regression algorithm is adopted to determine the active spatial differential terms from the candidate functions. Three benchmarks, the uniform and nonuniform transmission line, and a soliton generation system, are provided to demonstrate the validity of …

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Off-Axis Microsphere Photolithography Patterned Nanohole Array And Other Structures On An Optical Fiber Tip For Glucose Sensing, Jiayu Liu, Ibrahem Jasim, Tao Liu, Jie Huang, Edward Kinzel, Mahmoud Almasri Jul 2021

Off-Axis Microsphere Photolithography Patterned Nanohole Array And Other Structures On An Optical Fiber Tip For Glucose Sensing, Jiayu Liu, Ibrahem Jasim, Tao Liu, Jie Huang, Edward Kinzel, Mahmoud Almasri

Electrical and Computer Engineering Faculty Research & Creative Works

Microsphere photolithography (MPL) using off-axis UV exposure is a technique that uses a layer of self-assembled microspheres as an optical mask to project different periodic nanopatterns. This paper introduces MPL as an alternative fabrication technique to pattern complex metasurfaces on an optical single mode fiber tip as a sensor for measuring refractive index. Based on the hexagonal close packing microsphere array, complicated metasurfaces were successfully created by changing the UV illumination angle. Using the same self-assembled microspheres monolayer, multiple UV illumination jets were projected to create multiple hole group patterns. Fiber sensors with three-hole group and four-hole group patterns were …

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Modeling, Analysis, And Control Design Of A Single-Stage Boost Inverter, Md Rasheduzzaman, Poria Fajri, Jonathan W. Kimball, Brad Deken Jul 2021

Modeling, Analysis, And Control Design Of A Single-Stage Boost Inverter, Md Rasheduzzaman, Poria Fajri, Jonathan W. Kimball, Brad Deken

Electrical and Computer Engineering Faculty Research & Creative Works

A single-phase, single-stage, differential boost inverter comprises two independently-controlled boost DC-DC converters, with the load connected between their outputs. The net voltage on the load is sinusoidal and has a controllable frequency and magnitude that is larger than that of the DC source. The present work first derives steady-state and small-signal models of the inverter with parasitic elements. The results obtained from the line-to-output transfer function, control-to-output transfer function, open-loop input impedance, and open-loop output impedance models are compared with that of the ones obtained from the experimental testbed. Using the new models, a voltage mode controller is designed in …

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A Novel Demultiplexing Scheme For Vortex Beams In Radio Communication Systems, Yanming Zhang, Lijun Jiang Jul 2021

A Novel Demultiplexing Scheme For Vortex Beams In Radio Communication Systems, Yanming Zhang, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

The orbital angular momentum (OAM) based communication is a promising technology in the wireless communication system for its improving spectrum efficiency. However, for the OAM demultiplexing, it requires a very large aperture size in the receiving end due to the OAM beam divergence and the amplitude null in the beam center, which restricts the full development of OAM based communication. In this paper, we propose a novel partial arc sampling receiving (PASR) scheme based on the augmented dynamic mode decomposition (ADMD) to solve this issue. We explore the use of the phase delay coordinates in the conventional DMD to sort …

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Towards Enabling Unmanned Aerial Vehicles As A Service For Heterogeneous Applications, Farid Nait-Abdesselam, Ahmad Alsharoa, Mohamed Y. Selim, Daji Qiao, Ahmed E. Kamal Jun 2021

Towards Enabling Unmanned Aerial Vehicles As A Service For Heterogeneous Applications, Farid Nait-Abdesselam, Ahmad Alsharoa, Mohamed Y. Selim, Daji Qiao, Ahmed E. Kamal

Electrical and Computer Engineering Faculty Research & Creative Works

The increasing use of unmanned aerial vehicles (UAVs) in various commercial applications, such as precision agriculture and aerial remote sensing, is fast contributing to a significant growth in the UAV market. Also, it is crucial to provide continuous coverage after failures of wireless network components or additional bandwidth in high traffic situations. By introducing the concept of UAVs as a service (UaaS), we propose a novel framework, dubbed D3S, consisting of four phases: Demand, decision, deployment, and service. The main objective of this framework is to provide a realistic and streamlined approach to support the implementation of the UaaS paradigm. …

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Single Step 2-Port Device De-Embedding Algorithm For Fixture-Dut-Fixture Network Assembly, Simone Scafati, Enza Pellegrino, Francesco De Paulis, Carlo Olivieri, James L. Drewniak, Antonio Orlandi Jun 2021

Single Step 2-Port Device De-Embedding Algorithm For Fixture-Dut-Fixture Network Assembly, Simone Scafati, Enza Pellegrino, Francesco De Paulis, Carlo Olivieri, James L. Drewniak, Antonio Orlandi

Electrical and Computer Engineering Faculty Research & Creative Works

The de-embedding of measurement fixtures is relevant for an accurate experimental characterization of radio frequency and digital electronic devices. The standard technique consists in removing the effects of the measurement fixtures by the calculation of the transfer scattering parameters (T-parameters) from the available measured (or simulated) global scattering parameters (S-parameters). The standard de-embedding is achieved by a multiple steps process, involving the S-to-T and subsequent T-to-S parameter conversion. In a typical measurement setup, two fixtures are usually placed before and after the device under test (DUT) allowing the connection of the device to the calibrated vector network analyzer coaxial ports. …

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Optical And Structural Properties Of Manganese-Doped Zinc Oxide Grown By Metal-Organic Chemical Vapor Deposition, Vishal Saravade, Zahra Manzoor, Alexis Corda, Chuanle Zhou, Ian Ferguson, Na Lu Jun 2021

Optical And Structural Properties Of Manganese-Doped Zinc Oxide Grown By Metal-Organic Chemical Vapor Deposition, Vishal Saravade, Zahra Manzoor, Alexis Corda, Chuanle Zhou, Ian Ferguson, Na Lu

Electrical and Computer Engineering Faculty Research & Creative Works

This systematic study investigates the optical properties and process−structure−property relationships of Mn-doped zinc oxide (ZnMnO) grown by metal-organic chemical vapor deposition with varying Mn-doping concentration and growth conditions. ZnMnO exhibits a good crystal quality oriented in the (002) direction and contains intermixtures of zinc oxide (ZnO)-like and manganese oxide (MnxOy)-like phases. The material exhibits a direct energy absorption band-edge and a reduction in bandgap with Mn-doping. Photoluminescence studies show that Mn-doping can simultaneously tailor broad green band luminescence and ultraviolet edge emissions. Post-growth air-annealing results in broad MnxOy-related photoluminescence emissions at 3.3–4.5 eV. A further reduction in the absorption band-edge …

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Sensitivity-Enhanced Microwave-Photonic Optical Fiber Interferometry Based On The Vernier Effect, Chen Zhu, Jie Huang May 2021

Sensitivity-Enhanced Microwave-Photonic Optical Fiber Interferometry Based On The Vernier Effect, Chen Zhu, Jie Huang

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes optical carrier microwave interferometry (OCMI)-based optical fiber interferometers for sensing applications with improved measurement sensitivity with the assistance of the Vernier effect. Fabry-Perot interferometers (FPIs) are employed in the proof of concept. A single-FPI-OCMI system is first demonstrated for measurements of variations of temperatures by tracking the spectral shift of the interferogram in microwave domain. By cascading two FPIs with slightly different optical lengths, the Vernier effect is generated in the magnitude spectrum of the system with a typical amplitude-modulated signal. By tracking the shift of the envelope signal, temperature measurements are experimentally demonstrated with greatly enhanced …

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A Novel Hybrid Gwo-Ls Estimator For Harmonic Estimation Problem In Time Varying Noisy Environment, Muhammad Abdullah, Tahir N. Malik, Ali Ahmed, Muhammad F. Nadeem, Irfan A. Khan, Rui Bo May 2021

A Novel Hybrid Gwo-Ls Estimator For Harmonic Estimation Problem In Time Varying Noisy Environment, Muhammad Abdullah, Tahir N. Malik, Ali Ahmed, Muhammad F. Nadeem, Irfan A. Khan, Rui Bo

Electrical and Computer Engineering Faculty Research & Creative Works

The power quality of the Electrical Power System (EPS) is greatly affected by electrical harmonics. Hence, accurate and proper estimation of electrical harmonics is essential to design appropriate filters for mitigation of harmonics and their associated effects on the power quality of EPS. This paper presents a novel statistical (Least Square) and meta-heuristic (Grey wolf optimizer) based hybrid technique for accurate detection and estimation of electrical harmonics with minimum computational time. The non-linear part (phase and frequency) of harmonics is estimated using GWO, while the linear part (amplitude) is estimated using the LS method. Furthermore, harmonics having transients are also …

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Fuzzyart: An R Package For Art-Based Clustering, Louis Steinmeister, Donald C. Wunsch May 2021

Fuzzyart: An R Package For Art-Based Clustering, Louis Steinmeister, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

Adaptive Resonance Theory (ART) was introduced by Steven Grossberg as a theory of human cognitive information processing (Grossberg 1976, 1980). Extending the capabilities of the ART 1 model, which can learn to categorize patterns in binary data, fuzzy ART as described in (Carpenter, Grossberg, and Rosen 1991) has become one of the most commenly used Adaptive Resonance Theory models (Brito da Silva, Elnabarawy, and Wunsch 2019). By incorporating fuzzy set theroy operators, fuzzy ART is capable of learning from binaray and bounded real valued data. Its advantage over other unsupervised learning algorithms lies in the flexibility of the learning rule. …

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Isolation Enhancement For Mimo Patch Antennas Sharing A Common Thick Substrate: Using A Dielectric Block To Control Space-Wave Coupling To Cancel Surface-Wave Coupling, Min Li, Muhammad Yasir Jamal, Lijun Jiang, Kwan Lawrence Yeung Apr 2021

Isolation Enhancement For Mimo Patch Antennas Sharing A Common Thick Substrate: Using A Dielectric Block To Control Space-Wave Coupling To Cancel Surface-Wave Coupling, Min Li, Muhammad Yasir Jamal, Lijun Jiang, Kwan Lawrence Yeung

Electrical and Computer Engineering Faculty Research & Creative Works

This article presents a novel and simple decoupling method to increase the isolation between two closely spaced patch antennas sharing a common thick substrate. The decoupling can be simply realized by adding a pure dielectric block (DB) above the coupled array. By means of DB to modify the space permittivity (propagation constant), the space-wave coupling can be controlled to cancel surface-wave coupling for isolation enhancement. Five benchmarks of combinations of two patch antennas with different positions or orientations are investigated to validate the decoupling concept and elaborate on the design procedure. The results show that the proposed method could provide …

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Effectiveness Of Noise Suppressing Sheet Material For Mitigation Of Automotive Radiated Emissions, Patrick Deroy, Marina Y. Koledintseva, Cyrous F. Rostamzadeh, Micajah Worden, Tamara Monti, Waldemar Schulz, Abhishek Ramanujan Apr 2021

Effectiveness Of Noise Suppressing Sheet Material For Mitigation Of Automotive Radiated Emissions, Patrick Deroy, Marina Y. Koledintseva, Cyrous F. Rostamzadeh, Micajah Worden, Tamara Monti, Waldemar Schulz, Abhishek Ramanujan

Electrical and Computer Engineering Faculty Research & Creative Works

Integrated circuit (IC) and printed circuit board (PCB) electromagnetic (EM) modeling methods are becoming essential during the development of automotive electronic control units. Academic and industrial efforts focus on radiated and conducted emissions caused by flaws in PCB design from EM compatibility (EMC)/electrostatic discharge (ESD) point of view, including improper placement, grounding, and shielding of ICs. In this article, the effectiveness of noise suppressing sheet material for the mitigation of radiated emission at global positioning system (GPS) and Global'naya Navigatsionnaya Sputnikovaya Sistema (GLONASS) bands according to U.S. automotive original equipment manufacturer (OEM) requirements is investigated. A few test scenarios that …

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A Cascaded Power Dividing Decoupling Network For Antennas With Distinct Frequency Bands, Min Li, Lijun Jiang, Kwan Lawrence Yeung Mar 2021

A Cascaded Power Dividing Decoupling Network For Antennas With Distinct Frequency Bands, Min Li, Lijun Jiang, Kwan Lawrence Yeung

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes a novel decoupling method for two antennas operating in adjacent/contiguous frequency bands using a cascaded power dividing decoupling network (C- PDDN). An n-order C-PDDN can be designed to increase antenna isolation at n desired frequency points. Each PDDN is composed of two power dividers, two transmission lines, and one reactive component. Explicit design formulas are founded for determining design parameters. For illustration, a two-order C- PDDN is applied to a testing array. Results show that it could increase isolation by over 20 dB, verifying the effectiveness.

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Fiber Optic Sensor Embedded Smart Helmet For Real-Time Impact Sensing And Analysis Through Machine Learning, Yiyang Zhuang, Qingbo Yang, Taihao Han, Ryan O'Malley, Aditya Kumar, Rex E. Gerald Ii, Jie Huang Mar 2021

Fiber Optic Sensor Embedded Smart Helmet For Real-Time Impact Sensing And Analysis Through Machine Learning, Yiyang Zhuang, Qingbo Yang, Taihao Han, Ryan O'Malley, Aditya Kumar, Rex E. Gerald Ii, Jie Huang

Electrical and Computer Engineering Faculty Research & Creative Works

Background: Mild traumatic brain injury (mTBI) strongly associates with chronic neurodegenerative impairments such as post-traumatic stress disorder (PTSD) and mild cognitive impairment. Early detection of concussive events would significantly enhance the understanding of head injuries and provide better guidance for urgent diagnoses and the best clinical practices for achieving full recovery. New method: A smart helmet was developed with a single embedded fiber Bragg grating (FBG) sensor for real-time sensing of blunt-force impact events to helmets. The transient signals provide both magnitude and directional information about the impact event, and the data can be used for training machine learning (ML) …

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Floating Gate Schottky Junction Solar Cells With Improved Output Power, Amirhossein Ghods, Vishal Saravade, Andrew Woode, Corey Lerner, Chuanle Zhou, Ian T. Ferguson Mar 2021

Floating Gate Schottky Junction Solar Cells With Improved Output Power, Amirhossein Ghods, Vishal Saravade, Andrew Woode, Corey Lerner, Chuanle Zhou, Ian T. Ferguson

Electrical and Computer Engineering Faculty Research & Creative Works

In this article, the concept of floating gate Schottky junction (FGSJ) solar cell with improved photovoltaic properties, compared to those of the conventional Schottky junction solar cell, is proposed. The floating gate junction is electrically isolated from the current collection junction in order to prevent reduction in the barrier height at the floating gate contact from load voltage. The unaffected barrier height at the floating gate junction leads to a more effective separation of photo-generated electron-hole pairs, and therefore, a better photovoltaic response. Single junction FGSJ solar cells based on n-type GaAs with different doping concentration levels and gate contact …

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Coded Caching In The Presence Of A Wire And A Cache Tapping Adversary Of Type Ii, Mohamed Nafea, Aylin Yener Mar 2021

Coded Caching In The Presence Of A Wire And A Cache Tapping Adversary Of Type Ii, Mohamed Nafea, Aylin Yener

Electrical and Computer Engineering Faculty Research & Creative Works

This paper introduces the notion of cache-tapping into the information theoretic models of coded caching. The wiretap channel II in the presence of multiple receivers equipped with fixed-size cache memories, and an adversary which selects symbols to tap into from cache placement and/or delivery is introduced. The legitimate terminals know neither whether placement, delivery, or both are tapped, nor the positions in which they are tapped. Only the size of the overall tapped set is known. For two receivers and two files, the strong secrecy capacity–the maximum achievable file rate while keeping the overall library strongly secure–is identified. Lower and …

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High-Temperature Stable Fbgs Fabricated By A Point-By-Point Femtosecond Laser Inscription For Multi-Parameter Sensing, Chen Zhu, Dinesh Alla, Jie Huang Feb 2021

High-Temperature Stable Fbgs Fabricated By A Point-By-Point Femtosecond Laser Inscription For Multi-Parameter Sensing, Chen Zhu, Dinesh Alla, Jie Huang

Electrical and Computer Engineering Faculty Research & Creative Works

A high-temperature resistant fiber Bragg grating (FBG) with pronounced cladding modes is fabricated using a simple, fast, and flexible point-by-point femtosecond laser inscription. Cladding modes of different orders exhibit various sensitivities to changes in refractive index of the surrounding medium and temperature, while the Bragg wavelength is only dependent on the ambient temperature. By combining the resonance of cladding modes and the Bragg resonance, measurement of variations of temperature and surrounding refractive index can be achieved. Survivability of the cladding modes and the core mode in the fabricated FBG at elevated temperatures up to 1000°C is demonstrated.

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Noise Optimizes Super-Turing Computation In Recurrent Neural Networks, Emmett Redd, Steven Senger, Tayo Obafemi-Ajayi Feb 2021

Noise Optimizes Super-Turing Computation In Recurrent Neural Networks, Emmett Redd, Steven Senger, Tayo Obafemi-Ajayi

Electrical and Computer Engineering Faculty Research & Creative Works

This paper explores the benefit of added noise in increasing the computational complexity of digital recurrent neural networks (RNNs). The physically accepted model of the universe imposes rational number, stochastic limits on all calculations. An analog RNN with those limits calculates at the super-Turing complexity level BPP/log∗. In this paper, we demonstrate how noise aids digital RNNs in attaining super-Turing operation similar to analog RNNs. We investigate moving limited-precision systems from not being chaotic at small amounts of noise, through consistency with chaos, to overwhelming it at large amounts of noise. A Kolmogorov-complexity-based proof shows that an infinite computational class …

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