Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Machine learning (6)
- Convolutional neural network (3)
- Isolation (3)
- Characteristic impedance (2)
- Distributed sensing (2)
-
- Dynamic Mode Decomposition (DMD) (2)
- Feature selection (2)
- Ferrimagnetic (2)
- Mutual coupling (2)
- Neural Network (2)
- Notch filter (2)
- Optical frequency domain reflectometry (2)
- Power threshold (2)
- Source reconstruction method (2)
- Stripline (2)
- Subwavelength imaging (2)
- Virtual Synchronous Generator (2)
- AMC (1)
- ANN (1)
- Agricultural Field (1)
- Ancestry Classification (1)
- Antenna (1)
- Applied pressure (1)
- Autism spectrum disorder (1)
- Automation Of Manufacturing And Assembling Process (1)
- Backscattering (1)
- Band notch dipole (1)
- Bandit algorithm (1)
- Bandwidth (1)
- Battery Technology (1)
Articles 31 - 53 of 53
Full-Text Articles in Engineering
Antennas And Related Methods For Realizing Endfire Radiation With Vertical Polarization, Haozhan Tian, Lijun Jiang, Tatsuo Itoh
Antennas And Related Methods For Realizing Endfire Radiation With Vertical Polarization, Haozhan Tian, Lijun Jiang, Tatsuo Itoh
Electrical and Computer Engineering Faculty Research & Creative Works
Apparatus and systems for antennas for end fire radiation with vertical polarization are described. In an embodiment, an antenna includes a top patch, a ground substrate defining a hole, a feeding cable disposed to mate with the hole, two coupled radiating resonant cavities having two eigen-modes, where the coupled radiating resonant cavities are configured to form a beam, and where the antenna is configured for end fire radiation with vertical polarization.
Systems And Methods For Single-Element Beam Steering Antennas, Haozhan Tian, Lijun Jiang, Tatsuo Itoh
Systems And Methods For Single-Element Beam Steering Antennas, Haozhan Tian, Lijun Jiang, Tatsuo Itoh
Electrical and Computer Engineering Faculty Research & Creative Works
Systems and methods for single element beam steering antennas are provided. One embodiment includes: a first and second radiating resonant cavities, where the first and second radiating resonant cavities are coupled together; and at least one tunable component; where the first and second radiating resonant cavities, and the at least one tunable component are configured, in combination, to form a beam toward a desired direction, and where the at least one tunable component is configured to set the desired direction by an application of a bias voltage on the at least one tunable component.
Data-Driven Integral Reinforcement Learning For Continuous-Time Non-Zero-Sum Games, Yongliang Yang, Liming Wang, Hamidreza Modares, Dawei Ding, Yixin Yin, Donald C. Wunsch
Data-Driven Integral Reinforcement Learning For Continuous-Time Non-Zero-Sum Games, Yongliang Yang, Liming Wang, Hamidreza Modares, Dawei Ding, Yixin Yin, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
This paper develops an integral value iteration (VI) method to efficiently find online the Nash equilibrium solution of two-player non-zero-sum (NZS) differential games for linear systems with partially unknown dynamics. To guarantee the closed-loop stability about the Nash equilibrium, the explicit upper bound for the discounted factor is given. To show the efficacy of the presented online model-free solution, the integral VI method is compared with the model-based off-line policy iteration method. Moreover, the theoretical analysis of the integral VI algorithm in terms of three aspects, i.e., positive definiteness properties of the updated cost functions, the stability of the closed-loop …
Novel And Efficient Parasitic Decoupling Network For Closely Coupled Antennas, Min Li, Lijun Jiang, Kwan Lawrence Yeung
Novel And Efficient Parasitic Decoupling Network For Closely Coupled Antennas, Min Li, Lijun Jiang, Kwan Lawrence Yeung
Electrical and Computer Engineering Faculty Research & Creative Works
A novel and efficient parasitic decoupling network (PDN) is proposed for closely coupled antennas in this paper, which provides a new perspective and approach to design DNs based on the parasitic decoupling concept. The PDN is composed of sections of transmission lines (TLs) and reactive components, allowing additional power-traveling paths. With the TL lengths and reactive component reactance being precisely determined, the traveling power from one antenna to another could cancel out the undesired power wave induced by mutual coupling, resulting in the high port isolation. The decoupling theory is rigorously derived with the design procedure of the PDN systematically …
Source Reconstruction Method Based On Machine Learning Algorithms, He Ming Yao, Lijun Jiang, Wei E.I. Sha
Source Reconstruction Method Based On Machine Learning Algorithms, He Ming Yao, Lijun Jiang, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes a new source reconstruction method (SRM) based on deep learning. The conventional SRM usually requires oversampled measurements data to ensure higher accuracy. Thus, conventional SRM numerical system is usually highly singular. A deep convolutional neural network (ConvNet) is proposed to reconstruct the equivalent sources of the target to overcome difficulty. The deep ConvNet allows us to employ less data samples. Besides, the ill-conditioned numerical system can be effectively avoided. Numerical examples are presented to demonstrate the feasibility and accuracy of the proposed method. Its performance is also compared with the traditional neural network and interpolation method. Moreover, …
Analysis Of The Topological Photonic Crystals Using Finite-Difference Supercell Approach, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Zhihao Lan, Wei E.I. Sha
Analysis Of The Topological Photonic Crystals Using Finite-Difference Supercell Approach, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Zhihao Lan, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
Topological photonic systems have been explored extensively due to the robust electromagnetic states they support. In this work, we propose a finite-difference supercell approach to analyze the topological property of photonic crystal (PC) structures. Meanwhile, the pseudospin polarized edge states at the interface of two PC structures with different topologies are studied. The direction of the energy flow is found to be determined by the helicity of the pseudospin polarization.
A Phenomenological Model Of Non-Linear Loss In Ferrimagnetic Frequency-Selective Limiters, Anatoliy Boryssenko, Scott Gillette, Marina Koledintseva
A Phenomenological Model Of Non-Linear Loss In Ferrimagnetic Frequency-Selective Limiters, Anatoliy Boryssenko, Scott Gillette, Marina Koledintseva
Electrical and Computer Engineering Faculty Research & Creative Works
Operation of ferrimagnetic frequency-selective limiters (FSL) is based on non-linear absorption in magnetized ferrite films at RF/microwave power levels exceeding some threshold. A new phenomenological model of non-linear loss in a ferrite medium has been proposed, and it has been implemented in an efficient numerical algorithm for an FSL performance prediction.
Monitoring Of Cure State Through The Use Of Microwaves, David Judd, Frank Gramling, Reza Zoughi, Mohammad Tayeb Ahmad Ghasr
Monitoring Of Cure State Through The Use Of Microwaves, David Judd, Frank Gramling, Reza Zoughi, Mohammad Tayeb Ahmad Ghasr
Electrical and Computer Engineering Faculty Research & Creative Works
A method of manufacturing a tire is provided that includes curing the tire (10) in a curing press (12) and applying microwave energy at a given frequency band into the tire. The interaction between the microwave energy and the tire is monitored to obtain a complex reflection coefficient. A root-mean-squared error is calculated using the measured complex reflection coefficient and a reference reflection coefficient. The reference reflection coefficient is from a fully cured tire made from the same material as the tire. Continuous monitoring of the interaction takes place to obtain the complex reflection coefficient along …
In Situ Nmr Parameter Monitoring Systems And Methods For Measuring Ph And Temperature, Ming Huang, Lingyu Chi, Rex E. Gerald Ii, Jie Huang, Annalise R. Pfaff, Klaus Woelk
In Situ Nmr Parameter Monitoring Systems And Methods For Measuring Ph And Temperature, Ming Huang, Lingyu Chi, Rex E. Gerald Ii, Jie Huang, Annalise R. Pfaff, Klaus Woelk
Electrical and Computer Engineering Faculty Research & Creative Works
Devices and methods are provided for measuring temperatures and pHs of a sample in situ using NMR spectroscopy, and for sealing one or more ends of a capillary tube after a reference material has been added to the capillary tube, which is used in an in situ NMR temperature measurement device. A method for measuring a pH of a sample in situ using NMR spectroscopy includes providing an in situ NMR pH measurement device. This device includes a sample housing member configured to house a target sample, at least one pH sensor configured to exhibit an NMR spectral change due …
The Decoupling Methods For Increasing The Isolation Between Two Antennas, Min Li, Lijun Jiang
The Decoupling Methods For Increasing The Isolation Between Two Antennas, Min Li, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presented the parasitic structure decoupling method and other related approaches to increase the isolation between two closely coupled antennas. The design parameters of the resultant decoupling structures based on the proposed methods can be precisely derived instead of fitted to achieve high antenna isolations. A two-element monopole array is employed as a benchmark to demonstrate the effectiveness of the proposed methods. The simulation results show that good impedance matching and high port isolation could be achieved simultaneously based on the proposed methods.
A 2d/Q-2d Subdomain Finite Element Method For Irregular Power/Ground Plate-Pair Analysis With Waveport Excitation, Ping Li, Li (Lijun) Jun Jiang, Yao Jiang Zhang, Shuai Xu, Hakan Bagci
A 2d/Q-2d Subdomain Finite Element Method For Irregular Power/Ground Plate-Pair Analysis With Waveport Excitation, Ping Li, Li (Lijun) Jun Jiang, Yao Jiang Zhang, Shuai Xu, Hakan Bagci
Electrical and Computer Engineering Faculty Research & Creative Works
The field distribution of a power/ground plane can be fully characterized by TMzmn modes, where the electric fields have both azimuthal and longitudinal components and the magnetic fields have only the azimuthal component. Thus, if the magnetic fields are defined to be the unknowns in the finite element method (FEM) used for the analysis of the power/ground plane structure, the analysis becomes a quasi-two dimensional (Q-2D) problem. Since the high-order modes are evanescent, they are tightly confined to the near region of the vias guarded by anti-pads; while in the regions sufficiently far from the anti-pads, only the fundamental mode …
Solar Concentrators Manufacture And Automation, Ernst Kussul, Tetyana Baydyk, Alberto Escalante Estrada, Maria Tersa Rodriguez Gonzalez, Donald C. Wunsch
Solar Concentrators Manufacture And Automation, Ernst Kussul, Tetyana Baydyk, Alberto Escalante Estrada, Maria Tersa Rodriguez Gonzalez, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
Solar energy is one of the most promising types of renewable energy. Flat facet solar concentrators were proposed to decrease the cost of materials needed for production. They used small flat mirrors for approximation of parabolic dish surface. The first prototype of flat facet solar concentrators was made in Australia in 1982. Later various prototypes of flat facet solar concentrators were proposed. It was shown that the cost of materials for these prototypes is much lower than the material cost of conventional parabolic dish solar concentrators. To obtain the overall low cost of flat facet concentrators it is necessary to …
Prism-Based Dgtd With A Simplified Periodic Boundary Condition To Analyze Fss With D2n Symmetry In A Rectangular Array Under Normal Incidence, Wending Mai, Ping Li, Huaguang Bao, Xianjin Li, Lijun Jiang, Jun Hu, Douglas H. Werner
Prism-Based Dgtd With A Simplified Periodic Boundary Condition To Analyze Fss With D2n Symmetry In A Rectangular Array Under Normal Incidence, Wending Mai, Ping Li, Huaguang Bao, Xianjin Li, Lijun Jiang, Jun Hu, Douglas H. Werner
Electrical and Computer Engineering Faculty Research & Creative Works
In this letter, we develop a prism-based discontinuous Galerkin time-domain (DGTD) algorithm with simplified periodic boundary conditions (PBCs) to analyze infinite doubly periodic frequency selective surfaces (FSS). Most FSS structures contain patterned planar conductive layers and supporting dielectric layers. These layers are very thin compared to the wavelength. Therefore, general tetrahedral discretization of space will unnecessarily increase the number of mesh elements, as well as the number of unknowns. Instead, we propose using prismatic elements, which are more optimal for planar structures, resulting in less unknowns, less memory usage, and higher efficiency. The accuracy of the proposed prism based DGTD …
Ripple Canceling In Power Conversion Circuits, Pourya Shamsi, Mehdi Ferdowsi
Ripple Canceling In Power Conversion Circuits, Pourya Shamsi, Mehdi Ferdowsi
Electrical and Computer Engineering Faculty Research & Creative Works
A power circuit substantially canceling ripples at the source. The power circuit includes a switching circuit configured to control a power flow between an input and an output, a main storage element electrically connected in series with the switching circuit, and a resonant tank electrically coupled to the switching circuit and configured to compensate for switching ripples in the main storage element. Aspects of the invention can be applied to a converter circuit or to an inverter circuit.
Quasi-Continuous Metasurfaces For Orbital Angular Momentum Generation, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Quasi-Continuous Metasurfaces For Orbital Angular Momentum Generation, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
A quasi-continuous composite perfect electric conductor-perfect magnetic conductor metasurface and a systematic metasurface design process are proposed for the orbital angular momentum (OAM) generation. The metasurfaces reflect the incident left circularly polarized (LCP)/right circularly polarized (RCP) plane wave to RCP/LCP vortex beams carrying OAM at normal or oblique direction. Unlike conventional metasurfaces that are composed of discrete scatterers, the scatterers on the proposed metasurface form a quasi-continuous pattern. The patterning of the metasurface is calculated through grating vectors, and no optimization of single scatterer is required. Furthermore, the distortions from local-response discontinuity of discrete scatterers are avoided. This letter provides …
Generation Of Orbital Angular Momentum In 3d Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Generation Of Orbital Angular Momentum In 3d Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
An approach to producing electromagnetic (EM) waves carrying orbital angular momentum (OAM) by using three-dimensional (3D) photonic crystals (PCs) is proposed. By introducing a point defect in the PCs, a localized rotation mode is excited and then radiated out through a circular opening upon the defect. The radiated wave carries well-defined OAM. The lowest four OAM modes, i.e., OAM indices of ±1 and ±2, are successfully generated. The effectiveness of our approach is validated by both full-wave simulations and experiments.
A Compact Dual-Frequency Base-Station Dipole Array With Amc Reflector, Min Li, Lijun Jiang
A Compact Dual-Frequency Base-Station Dipole Array With Amc Reflector, Min Li, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A compact dual-frequency dipole array is presented for use in base stations operating in the Digital Cellular System (DCS) and Wideband Code Division Multiple Access (WCDMA) bands. The size-miniaturization is realized by utilizing band notch dipole (BND) as array element and artificial magnetic conductor (AMC) as array reflector for reductions in array width and profile height, respectively. Simulation results show that good impedance matching, high antenna isolation, and good radiation performances are achieved simultaneously.
Ultra-Lightweight Mutual Authentication Protocol With Substitution Operation, Al Salour, Douglas D. Trimble, Jagannathan Sarangapani, Eyad S. Taqieddin
Ultra-Lightweight Mutual Authentication Protocol With Substitution Operation, Al Salour, Douglas D. Trimble, Jagannathan Sarangapani, Eyad S. Taqieddin
Electrical and Computer Engineering Faculty Research & Creative Works
A method comprises using at least one of a reader and a passive tag to exchange values according to an ultra-lightweight mutual authentication protocol with a substitution operation to change a Hamming weight of the values.
Graphene Based Functional Devices: A Short Review, Rong Wang, Xin Gang Ren, Ze Yan, Li (Lijun) Jun Jiang, Wei E.I. Sha, Guang Cun Shan
Graphene Based Functional Devices: A Short Review, Rong Wang, Xin Gang Ren, Ze Yan, Li (Lijun) Jun Jiang, Wei E.I. Sha, Guang Cun Shan
Electrical and Computer Engineering Faculty Research & Creative Works
Graphene is an ideal 2D material system bridging electronic and photonic devices. It also breaks the fundamental speed and size limits by electronics and photonics, respectively. Graphene offers multiple functions of signal transmission, emission, modulation, and detection in a broad band, high speed, compact size, and low loss. Here, we have a brief view of graphene based functional devices at microwave, terahertz, and optical frequencies. Their fundamental physics and computational models were discussed as well.
Random Subspace Projection For Predicting Biogeographical Ancestry, Tanjin Toma, Tayo Olufemi-Ajayi, Jeremy Dawson, Donald Adjeroh
Random Subspace Projection For Predicting Biogeographical Ancestry, Tanjin Toma, Tayo Olufemi-Ajayi, Jeremy Dawson, Donald Adjeroh
Electrical and Computer Engineering Faculty Research & Creative Works
Human biogeographical ancestry estimation using genomic information is an important problem with applications in population stratification, admixture mapping, forensic ancestry inference, and in healthcare. Various studies have proposed panels of ancestry informative single nucleotide polymorphisms (SNPs) for distinguishing between widely separated continental populations. There has been limited investigation on identifying SNP panels for sub-continental ancestry prediction, especially given the difficult challenge of identifying SNP markers to distinguish closely associated sub-populations, for instance, within a continent. In this study, we propose an ancestry informative SNP selection algorithm exploiting the concept of random subspace projection using supervised learning. The proposed approach identifies …
A Compact Single-Element Pattern Reconfigurable Antenna With Wide-Angle Scanning Tuned By A Single Varactor, Haozhan Tian, Lijun Jiang, Tatsuo Itoh
A Compact Single-Element Pattern Reconfigurable Antenna With Wide-Angle Scanning Tuned By A Single Varactor, Haozhan Tian, Lijun Jiang, Tatsuo Itoh
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we propose a convenient fixed-frequency beam steering method, using a single patch antenna controlled by only one electronically tunable component. The antenna is based on coupled-mode patch antenna (CMPA) [1] that is capable to scan the beam as the function of frequency. A ground-etched slot loaded with one varactor diode is tuned to be capacitive, resonant, or inductive. In order to test broader tuning range, two kinds of varactors with the ranges of 9.24 pF-1.77 pF and 2.67 pF-0.63 pF are implemented respectively. By analyzing how the loaded slot affects the cavity modes and fields, we demonstrate …
Machine-Learning-Based Pml For The Fdtd Method, He Ming Yao, Lijun Jiang
Machine-Learning-Based Pml For The Fdtd Method, He Ming Yao, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
In this letter, a novel absorbing boundary condition (ABC) computation method for finite-difference time-domain (FDTD) is proposed based on the machine learning approach. The hyperbolic tangent basis function (HTBF) neural network is introduced to replace traditional perfectly matched layer (PML) ABC during the FDTD solving process. The field data on the interface of conventional PML are employed to train HTBF-based PML model. Compared to the conventional approach, the novel method greatly decreases the size of a computation domain and the computation complexity of FDTD because the new model only involves the one-cell boundary layer. Numerical examples are provided to benchmark …
Applying Deep Learning Approach To The Far-Field Subwavelength Imaging Based On Near-Field Resonant Metalens At Microwave Frequencies, He Ming Yao, Min Li, Lijun Jiang
Applying Deep Learning Approach To The Far-Field Subwavelength Imaging Based On Near-Field Resonant Metalens At Microwave Frequencies, He Ming Yao, Min Li, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we utilize the deep learning approach for the subwavelength imaging in far-field, which is realized by the near-field resonant metalens at microwave frequencies. The resonating metalens consisting of split-ring resonators (SRRs) are equipped with the strong magnetic coupling ability and can convert evanescent waves into propagating waves using the localized resonant modes. The propagating waves in the far-field are utilized as the input of a trained deep convolutional neural network (CNN) to realize the imaging. The training data for establishing the deep CNN are obtained by the EM simulation tool. Besides, the white Gaussian noise is added …