Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

Electrical and Computer Engineering Faculty Research & Creative Works

Discipline
Keyword
Publication Year

Articles 871 - 900 of 3518

Full-Text Articles in Engineering

Planar Resonator Embedded Substrate Integrated Waveguide (Siw) Cavity Filter, Kirti Dhwaj, Richard Hadi, Tao Yang, Li (Lijun) Jun Jiang, Joshu Kovitz, Tatsuo Itoh Nov 2018

Planar Resonator Embedded Substrate Integrated Waveguide (Siw) Cavity Filter, Kirti Dhwaj, Richard Hadi, Tao Yang, Li (Lijun) Jun Jiang, Joshu Kovitz, Tatsuo Itoh

Electrical and Computer Engineering Faculty Research & Creative Works

Two capacitor loaded planar resonators are introduced in a two-cavity substrate integrated waveguide (SIW) structure to obtain a fourth order filter. The planar resonators each produce a transmission zero by signal interference. Design methodology for a 5 % bandwidth bandpass filter operating at 2.35 GHz is presented in the paper. Two transmission zeroes are placed on either side of the filter passband to obtain a quasi-elliptic response with a mid-band inserion loss of 1.65 dB. Good agreement is obtained between measured and simulated responses of the single-layer printed circuit board (PCB) filter.

Go to article

A New Efficient Domain Decomposition Method For Highly Irregular Via Patterns, Ping Li, Lijun Jiang, Xiaoyan Xiong, Hakan Bagci Nov 2018

A New Efficient Domain Decomposition Method For Highly Irregular Via Patterns, Ping Li, Lijun Jiang, Xiaoyan Xiong, Hakan Bagci

Electrical and Computer Engineering Faculty Research & Creative Works

In the high-speed signal path on PCB and packagings, vias usually causes most discontinuities and thereby crosstalks. In simulation and characterizations, they also generate more errors than the trace parts due to rich modes around them. To achieve both efficiency and accuracy, in this paper, a new domain decomposition based finite element time domain (FETD) method is proposed for the analysis of power/ground plate pairs with various types of antipads. Using the magnetic field feature, the 3D computational domain is firstly represented by a quasi-2D field. Then by taking advantage of the fast decaying property of high order modes, the …

Go to article

Resilient Adaptive Optimal Control Of Distributed Multi-Agent Systems Using Reinforcement Learning, Rohollah Moghadam, Hamidreza Modares Nov 2018

Resilient Adaptive Optimal Control Of Distributed Multi-Agent Systems Using Reinforcement Learning, Rohollah Moghadam, Hamidreza Modares

Electrical and Computer Engineering Faculty Research & Creative Works

This study presents a unified resilient model-free reinforcement learning (RL) based distributed control protocol for leader-follower multi-agent systems. Although RL has been successfully used to learn optimal control protocols for multi-agent systems, the effects of adversarial inputs are ignored. It is shown in this study, however, that their adverse effects can propagate across the network and impact the learning outcome of other intact agents. To alleviate this problem, a unified RL-based distributed control frameworks is developed for both homogeneous and heterogeneous multi-agent systems to prevent corrupted sensory data from propagating across the network. To this end, only the leader communicates …

Go to article

Physical And Technological Aspects Of Microstrip Ebg Filter Design, Marina Koledintseva, Sergiu Radu, Joe Nuebel Oct 2018

Physical And Technological Aspects Of Microstrip Ebg Filter Design, Marina Koledintseva, Sergiu Radu, Joe Nuebel

Electrical and Computer Engineering Faculty Research & Creative Works

Some physical and technological aspects of the electromagnetic bandgap (EBG) common-mode (CM) filters are discussed. A simple EBG notch filter for CM in edge-coupled differential microstrip pair is designed using full-wave numerical electromagnetic software. Mixed-mode S-parameters of the EBG structure are analyzed as functions of its basic geometry, including size and number of EBG patches, gaps between them, geometry and position of signal traces across the EBG patches. In this work, one and two differential pairs crossing the EBG patches are considered. It is shown that the filter performance depends on various technological features, such as frequency-dispersive core and prepreg …

Go to article

Detection Of Multiple Orbital-Angular-Momentum Beams By A Single Metasurface, Menglin L.N. Chen, Wei E.L. Sha, Li (Lijun) Jun Jiang Oct 2018

Detection Of Multiple Orbital-Angular-Momentum Beams By A Single Metasurface, Menglin L.N. Chen, Wei E.L. Sha, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

An approach for the detection of orbital angular momentum (OAM) is proposed. By formulating the transmission function of an arbitrary aperture, desired field distribution can be generated. A geometric-phase based metasurface is used to implement the aperture that is designed to convert an OAM wave to a directional wave with distinguishable radiation direction according to the incident OAM. Therefore, by examining the directivity, we can tell the value of incident OAM. The effectiveness of our approach is validated by numerical calculation and full-wave simulation.

Go to article

Machine Learning Based Computational Electromagnetic Analysis For Electromagnetic Compatibility, L. (Lijun) J. Jiang, H. M. Yao, H. H. Zhang, Y. W. Qin Oct 2018

Machine Learning Based Computational Electromagnetic Analysis For Electromagnetic Compatibility, L. (Lijun) J. Jiang, H. M. Yao, H. H. Zhang, Y. W. Qin

Electrical and Computer Engineering Faculty Research & Creative Works

While machine learning is becoming a demanding request in every corner of modern technology development, we are trying to see if we could make computational electromagnetic algorithms compatible to machine learning methods. In this paper, we introduce two efforts in line with this direction: solving method of moments (MoM) can be seen as a training training process. Consequently, the artificial neural network (ANN) could be used to solve MoM naturally through training. Amazon Web Service (AWS) can be used as the computations platform to utilize the existing hardware and software resources for machine learning. Another effort regarding to the nonlinear …

Go to article

Model Order Reduction Schemes In Solving Multi-Scale Electromagnetic Problems, Qin S. Liu, Li (Lijun) Jun Jiang, Qi Dai, Hui Gan, Tian Xia, Ting Wan, Sheng Sun, Weng Cho Chew Oct 2018

Model Order Reduction Schemes In Solving Multi-Scale Electromagnetic Problems, Qin S. Liu, Li (Lijun) Jun Jiang, Qi Dai, Hui Gan, Tian Xia, Ting Wan, Sheng Sun, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

Reduced-order models show significant advantages in solving multi-scale electromagnetic problems when the equivalence surfaces are used to enclose the dense-mesh features. With much coarse discretization on the equivalence surface, the computational complexities are largely reduced. Additionally, the scheme is suitable for the scattering problems especially when the location of radiator changes.

Go to article

Noncontact Time-Domain Emi Measurement Of Two Adjacent Traces On A Pcb, Haimi Qiu, Chengyang Luo, Wenxiao Fang, Lijun Jiang Oct 2018

Noncontact Time-Domain Emi Measurement Of Two Adjacent Traces On A Pcb, Haimi Qiu, Chengyang Luo, Wenxiao Fang, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Nonintrusive electromagnetic interference (EMI) detection is a powerful method for EMI diagnosis in high-speed links and multiple signal PCB designs. However, due to the dispersive nature of signal delivery passages and interferences from neighborhood signals, it is very difficult to locate exactly the EMI source of two adjacent traces without contact. In this paper, a noncontact time-domain voltage measurement method is proposed to detect the EMI signals of two adjacent traces on a PCB. A near-field electric probe is employed and a reconstruction algorithm is developed to recover the voltage signals without contact. Through experimental benchmarks, it is demonstrated that …

Go to article

The Evolution Of Peec Methods For Si, Pi, And Antennas, Lijun Jiang, Albert E. Ruehli Oct 2018

The Evolution Of Peec Methods For Si, Pi, And Antennas, Lijun Jiang, Albert E. Ruehli

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

Go to article

Soft Ferrites For Emc Applications, Marina Y. Koledintseva Oct 2018

Soft Ferrites For Emc Applications, Marina Y. Koledintseva

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

Go to article

Quality Criteria For Electromagnetic Wave Absorbers, Konstantin N. Rozanov, Marina Y. Koledintseva Oct 2018

Quality Criteria For Electromagnetic Wave Absorbers, Konstantin N. Rozanov, Marina Y. Koledintseva

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

Go to article

Equivalent Capacitance And Multilayer Models For Effective Roughness Dielectric In Pcbs, Marina Koledintseva, Tracey Vincent Oct 2018

Equivalent Capacitance And Multilayer Models For Effective Roughness Dielectric In Pcbs, Marina Koledintseva, Tracey Vincent

Electrical and Computer Engineering Faculty Research & Creative Works

Effective Roughness Dielectric (ERD) is used to substitute copper foil roughness in printed circuit board (PCB) interconnects. In this work, the equivalent capacitance approach is used to get the ERD parameters based on the understanding that there is a gradual variation of concentration of metallic inclusions in the transition layer between the dielectric and foil. The metallic concentration profile can be extracted from scanning electron microscopy (SEM) or high-resolution optical microscopy. The proposed model of equivalent capacitance with gradient dielectric is applied to standard (STD), very-low-profile (VLP), and hyper-very-low profile (HVLP) foils, and the frequency-dependent dielectric parameters of the homogenized …

Go to article

Influence Of Higher-Order Modes In Coaxial Waveguide On Measurements Of Material Parameters, Dmitry A. Petrov, Konstantin N. Rozanov, Marina Y. Koledintseva Oct 2018

Influence Of Higher-Order Modes In Coaxial Waveguide On Measurements Of Material Parameters, Dmitry A. Petrov, Konstantin N. Rozanov, Marina Y. Koledintseva

Electrical and Computer Engineering Faculty Research & Creative Works

The use of a coaxial air-filled line as a test fixture for measuring complex permittivity and permeability often shows odd resonance-like behavior of material parameters as functions of frequency. This effect is typically either ascribed to the half-wavelength resonance at the sample length, or erroneously misinterpreted as intrinsic resonance behavior of the material. However, as is shown in this paper, such behavior can be attributed to excitation of the higher-order modes on the surface of the sample resulting in resonance absorption of electromagnetic energy in the test fixture. Herein, analytical, numerical, and experimental results show that there can actually be …

Go to article

Introduction To The (Peec) Partial Element Equivalent Circuit Approach Applied To Si/Pi, Albert E. Ruehli, Lijun Jiang, Giulio Antonini Oct 2018

Introduction To The (Peec) Partial Element Equivalent Circuit Approach Applied To Si/Pi, Albert E. Ruehli, Lijun Jiang, Giulio Antonini

Electrical and Computer Engineering Faculty Research & Creative Works

This article consists only of a collection of slides from the author's conference presentation.

Go to article

Introduction To The Finite-Difference Time-Domain (Fdtd) Technique, Bruce Archambeault Oct 2018

Introduction To The Finite-Difference Time-Domain (Fdtd) Technique, Bruce Archambeault

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

Go to article

Anharmonic Phonon Coupling In Single-Crystal Semiconducting And Metal-Like Van Der Waals In2se3, John Igo, Shengwen Zhou, Zhi Gang Yu, Oliver Peter Amnuayphol, Feng Zhao, Yi Gu Oct 2018

Anharmonic Phonon Coupling In Single-Crystal Semiconducting And Metal-Like Van Der Waals In2se3, John Igo, Shengwen Zhou, Zhi Gang Yu, Oliver Peter Amnuayphol, Feng Zhao, Yi Gu

Electrical and Computer Engineering Faculty Research & Creative Works

We study the anharmonic phonon interactions in the single-crystal semiconducting (α) and metal-like (β) van der Waals In2Se3 layers, through the determination and analysis of temperature-dependent Raman spectra and thermal conductivities, supported by first-principles calculations of phonon band structures. Our results indicate strong lattice anharmonicity in β-In2Se3 giving rise to significant phonon peak broadening and a suppressed lattice thermal conductivity and reveal that the anharmonic phonon interactions are the main thermal transport-limiting mechanism in both phases. The low thermal conductivity combined with a large electrical conductivity makes the metal-like β-In2Se3 a potential efficient thermoelectric material.

Go to article

Meta-Learning Related Tasks With Recurrent Networks: Optimization And Generalization, Thy Nguyen, A. Steven Younger, Emmett Redd, Tayo Obafemi-Ajayi Oct 2018

Meta-Learning Related Tasks With Recurrent Networks: Optimization And Generalization, Thy Nguyen, A. Steven Younger, Emmett Redd, Tayo Obafemi-Ajayi

Electrical and Computer Engineering Faculty Research & Creative Works

There have been recent interest in meta-learning systems: I.e., networks that are trained to learn across multiple tasks. This paper focuses on optimization and generalization of a meta-learning system based on recurrent networks. The optimization investigates the influence of diverse structures and parameters on its performance. We demonstrate the generalization (robustness) of our meta-learning system to learn across multiple tasks including tasks unseen during the meta training phase. We introduce a meta-cost function (Mean Squared Fair Error) that enhances the performance of the system by not penalizing it during transitions to learning a new task. Evaluation results are presented for …

Go to article

Off-Policy Integral Reinforcement Learning For Semi-Global Constrained Output Regulation Of Continuous-Time Linear Systems, Yongliang Yang, Xianzhong Chen, Yixin Yin, Donald C. Wunsch Oct 2018

Off-Policy Integral Reinforcement Learning For Semi-Global Constrained Output Regulation Of Continuous-Time Linear Systems, Yongliang Yang, Xianzhong Chen, Yixin Yin, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a data-driven method based on off-policy integral reinforcement learning to solve the semi-global output regulation of continuous-time linear systems with input saturation. A family of state feedback laws for the input constrained output regulation problem is designed based on solving an algebraic Riccati equation. In contrast to the existing methods, complete knowledge of the system dynamics is no longer required in this paper. Instead, the data collected from online implementation is efficiently utilized to design the controller. Therefore, the controller design in this paper is data driven. It is shown that the presented method can find feedback …

Go to article

Low-Profile Diplexing Filter/Antenna Based On Common Radiating Cavity With Quasi-Elliptic Response, Kirti Dhwaj, Xiaoqiang Li, Li (Lijun) Jun Jiang, Tatsuo Itoh Oct 2018

Low-Profile Diplexing Filter/Antenna Based On Common Radiating Cavity With Quasi-Elliptic Response, Kirti Dhwaj, Xiaoqiang Li, Li (Lijun) Jun Jiang, Tatsuo Itoh

Electrical and Computer Engineering Faculty Research & Creative Works

A low-profile single-layer substrate integrated waveguide (SIW) diplexing filtering antenna with two-pole response in each channel is presented. Synthesis technique is proposed, which allows independent design of the filtering networks for the two channels. A common slot loaded SIW cavity is used to obtain the desired radiation in both channels. The diplexing filtering antenna provides quasi-elliptic response in both channels due to source-load coupling. The filtering antenna provides a maximum broadside gain of 2.65 and 2.7 dBi at operating frequencies of 5.25 (lower channel) and 5.8 GHz (upper channel), respectively. The interchannel isolation is more than 29 dB with a …

Go to article

An Efficient Mode-Based Domain Decomposition Hybrid 2-D/Q-2d Finite-Element Time-Domain Method For Power/Ground Plate-Pair Analysis, Ping Li, Li (Lijun) Jun Jiang, Yao Jiang Zhang, Shuai Xu, Hakan Bagci Oct 2018

An Efficient Mode-Based Domain Decomposition Hybrid 2-D/Q-2d Finite-Element Time-Domain Method For Power/Ground Plate-Pair Analysis, Ping Li, Li (Lijun) Jun Jiang, Yao Jiang Zhang, Shuai Xu, Hakan Bagci

Electrical and Computer Engineering Faculty Research & Creative Works

Generally, with a surface magnetic current excitation, only the TM zmn modes are activated between the power/ground plate pair. As a result, the magnetic field only has azimuthal component while the longitude component is zero. To make full use of this quasi-2-D (Q-2D) property, a Q-2D finite-element time-domain (FETD) method combined with the basic 3-D triangular prism mesh elements is firstly proposed to solve the magnetic field wave equation. It is further noted that the higher order modes are confined in the proximity of the antipads (labeled as via domain) due to the exponential attenuation property along the propagating direction. …

Go to article

Circuitry Design And Magnetic Susceptibility Evaluation Of 7t Fmri Implantable Rf Coil, Rong Wang, Celia M. Dong, Ed X. Wu, Robert C. Roberts, Li (Lijun) Jun Jiang Oct 2018

Circuitry Design And Magnetic Susceptibility Evaluation Of 7t Fmri Implantable Rf Coil, Rong Wang, Celia M. Dong, Ed X. Wu, Robert C. Roberts, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Implantable coils have been widely utilized in functional magnetic resonance imaging (fMRI) owing to their superior signal to noise ratio. To effectively minimize the magnetic field distortion and image artifacts, the magnetic susceptibility of the implantable coil needs to be evaluated before practical use. In this work, we experimentally identify the magnetic susceptibility of each component of the implantable coil with the 7T Bruker NMR imaging scanner and provide useful guidelines for the following manufacturing. A 5 5 mm 2 implantable surface coil with a tunable frequency range is subsequently introduced for the 7T fMRI of the rat primary somatosensory …

Go to article

Decoupling Of Multi-Element Mimo Antennas, Min Li, L. (Lijun) J. Jiang Sep 2018

Decoupling Of Multi-Element Mimo Antennas, Min Li, L. (Lijun) J. Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

An efficient decoupling technique for multi-element MIMO antennas is proposed in this paper. A general model of using parasitic decoupling structure (PDS) to satisfy the criterions derived from antenna impedances for perfect isolation is presented. A prototype of three monopole antennas is realized on a Rogers PCB for demonstration purpose. The simulation results show that good impedance matching and high port isolation are achieved simultaneously.

Go to article

Advanced Metal Oxides And Nitrides Thermoelectric Materials For Energy Harvesting, Yining Feng, Evan Witkoske, Elizabeth S. Bell, Yang Wang, Athanasios Tzempelikos, Ian T. Ferguson, Na Lu Sep 2018

Advanced Metal Oxides And Nitrides Thermoelectric Materials For Energy Harvesting, Yining Feng, Evan Witkoske, Elizabeth S. Bell, Yang Wang, Athanasios Tzempelikos, Ian T. Ferguson, Na Lu

Electrical and Computer Engineering Faculty Research & Creative Works

Metal oxides and nitrides are widely used in many applications as a result of their high mechanical, chemical, and electrical properties. In high temperature thermoelectric applications, oxides and nitrides exhibit high thermopower and thermal stability. Moreover, most oxides and nitrides are consisted of earth abundant elements, which are non-toxic, cost effective and easy for large-scale synthesis. In this article, we reviewed the recent advances of metal oxides and nitrides and their applications in thermoelectric. The materials that are examined include both p-type semiconductors (e.g. NaxCoO2, Ca3Co4O9, GaN) and n-type semiconductors (e.g. ZnO-based, …

Go to article

An Overview Of Direct Current Distribution System Architectures & Benefits, Venkata Anand Prabhala, Bhanu Prashant Baddipadiga, Poria Fajri, Mehdi Ferdowsi Sep 2018

An Overview Of Direct Current Distribution System Architectures & Benefits, Venkata Anand Prabhala, Bhanu Prashant Baddipadiga, Poria Fajri, Mehdi Ferdowsi

Electrical and Computer Engineering Faculty Research & Creative Works

This paper examines existing and future direct current (DC) distribution systems with a wide range of applications in data centers, telecommunication systems, commercial buildings, residential homes, electric vehicles, spacecraft, and aircrafts. DC distribution systems have many advantages and disadvantages over their alternating current (AC) counterparts. There are a few surviving examples of DC distribution systems; among them are the telecommunication systems and data centers that use the low-voltage 48 Vdc systems. However, recently, there has been a move towards higher DC bus voltages. In this paper, a comparative study of different DC distribution architectures and bus structures is presented and …

Go to article

Cooperative Interference Control In Neighboring Passive Scattering Antennas, Shadi Ebrahimi-Asl, Mohammad Tayeb Ahmad Ghasr, Maciej Zawodniok Sep 2018

Cooperative Interference Control In Neighboring Passive Scattering Antennas, Shadi Ebrahimi-Asl, Mohammad Tayeb Ahmad Ghasr, Maciej Zawodniok

Electrical and Computer Engineering Faculty Research & Creative Works

Passive backscattering links in scattering sensor arrays suffer from mutual coupling among closely spaced neighbor antennas. This effect results in an unmatched circuitry at input ports of antennas causing poor power harvesting, weak backscattering, overall low read rates. In this paper, a model for mutual coupling in a $N$ by $N$ scattering antenna arrays is discussed. We show by simulations and measurements that in a two-scatterer system (one target and one neighbor antennas) the mutual coupling effect from the neighbor to the target varies depending on its load and also its location with respect to the target and the incident …

Go to article

Node-Based Resilience Measure Clustering With Applications To Noisy And Overlapping Communities In Complex Networks, John Matta, Tayo Obafemi-Ajayi, Jeffrey Borwey, Koushik Sinha, Donald C. Wunsch, Gunes Ercal Aug 2018

Node-Based Resilience Measure Clustering With Applications To Noisy And Overlapping Communities In Complex Networks, John Matta, Tayo Obafemi-Ajayi, Jeffrey Borwey, Koushik Sinha, Donald C. Wunsch, Gunes Ercal

Electrical and Computer Engineering Faculty Research & Creative Works

This paper examines a schema for graph-theoretic clustering using node-based resilience measures. Node-based resilience measures optimize an objective based on a critical set of nodes whose removal causes some severity of disconnection in the network. Beyond presenting a general framework for the usage of node-based resilience measures for variations of clustering problems, we experimentally validate the usefulness of such methods in accomplishing the following: (i) clustering a graph in one step without knowing the number of clusters a priori; (ii) removing noise from noisy data; and (iii) detecting overlapping communities. We demonstrate that this clustering schema can be applied successfully …

Go to article

Generation Of Orbital Angular Momentum By A Point Defect In Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha Jul 2018

Generation Of Orbital Angular Momentum By A Point Defect In Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

As an attractive degree of freedom in electromagnetic (EM) waves, the orbital angular momentum (OAM) enables infinite communication channels for both classical and quantum communications. The exploration of OAM generation inspires various designs involving spiral phase plates, antenna arrays, metasurfaces, and computer-generated holograms. In this work, we theoretically and experimentally demonstrate an approach to producing OAM carrying EM waves by a point defect in three-dimensional (3D) photonic crystals (PCs). Simultaneous excitation of two vibrational-defect states with an elaborately engineered phase retardation generates a rotational state carrying OAM. Through converting guided waves in a line defect to localized waves in a …

Go to article

Correction: Orbital Angular Momentum Generation And Detection By Geometric-Phase Based Metasurfaces [Appl. Sci., 8, (2018), (362)] Doi:10.3390/App8030362, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha Jul 2018

Correction: Orbital Angular Momentum Generation And Detection By Geometric-Phase Based Metasurfaces [Appl. Sci., 8, (2018), (362)] Doi:10.3390/App8030362, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

We, the authors, wish to make the following corrections to our paper [1]. We found that the literature we listed on page 2 has a mistake: "Afterwards, many other devices for OAM generation have been proposed, such as the cylindrical lens in 1993 [30], spiral phase plates (SPPs) in 1994 [31], q plates in 2006 [32]." We would like to give credit to the first phase rotor filter [2] and remove the year for the designs. Thus, the statement would be changed to: "In 1992, a phase rotor filter was devised to introduce the azimuthal phase term [30]. Afterwards, many …

Go to article

Analysis Of Grapevine Gene Expression Data Using Node-Based Resilience Clustering, Jeffrey Dale, John Matta, Susanne Howard, Gunes Ercal, Wenping Qiu, Tayo Obafemi-Ajayi Jul 2018

Analysis Of Grapevine Gene Expression Data Using Node-Based Resilience Clustering, Jeffrey Dale, John Matta, Susanne Howard, Gunes Ercal, Wenping Qiu, Tayo Obafemi-Ajayi

Electrical and Computer Engineering Faculty Research & Creative Works

Powdery mildew is the most economically important disease of cultivated grapevines worldwide. In the agricultural community, there is a great need for better understanding of the complex genetic basis of powdery mildew (PM) resistance by delineating possible gene biomarkers associated with the plants' defense mechanisms. Machine learning techniques can be applied to analysis of gene expression data to aid knowledge discovery of disease fighting genes. In this work, we apply a data-driven computational model, utilizing a graph-based clustering algorithm - Node-Based Resilience Clustering (NBRClust), to analyze grapevine gene expression data to identify possible gene biomarkers associated with powdery mildew disease …

Go to article

A Unified Analysis Framework For Tensor Metasurfaces, Bo O. Zhu, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang Jul 2018

A Unified Analysis Framework For Tensor Metasurfaces, Bo O. Zhu, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Tensor impedance metasurfaces have attracted much attention recently due to their ability to flexibly manipulate both propagating and surface waves. So far, the analysis of tensor impedance has not been fully supported by commercial electromagnetic simulation software. Also, the representation of formulas of penetrable tensor impedance for both propagating and surface waves is limited in the literature. Hence, a unified analysis framework is proposed for this purpose. It allows the calculation of wave reflection and transmission with arbitrary incident angles, or inversely, the calculation of surface impedance tensors given the desired wave propagation properties. It also allows surface eigenmode analysis, …

Go to article

First Prev Next Last