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Articles 1 - 30 of 51
Full-Text Articles in Engineering
Inorganic Biodegradable Substrates For Devices And Systems, Chang-Soo Kim, Richard K. Brow, D. E. Day
Inorganic Biodegradable Substrates For Devices And Systems, Chang-Soo Kim, Richard K. Brow, D. E. Day
Electrical and Computer Engineering Faculty Research & Creative Works
Disclosed are biodegradable glass substrates that are useful as functional elements of solid-state devices. In particular, biodegradable glass substrates having a rapidly degradable glass and a slowly degradable glass provide a structural platform that completely dissolves following a desired operational lifetime of devices such as implanted electronic devices, implanted sensor devices, and optical fibers.
An Analysis Of Scattering From Snow With Relaxed Hierachical Equivalent Source Algorithm, Chan Fai Lum, Hong Tat Ewe, Fu Xin, Li (Lijun) Jun Jiang, Hean Teik Chuah
An Analysis Of Scattering From Snow With Relaxed Hierachical Equivalent Source Algorithm, Chan Fai Lum, Hong Tat Ewe, Fu Xin, Li (Lijun) Jun Jiang, Hean Teik Chuah
Electrical and Computer Engineering Faculty Research & Creative Works
Traditionally, Radiative Transfer (RT) formulation has been used to simulate scattering from snow layer with the incorporation of phase matrix of scatterers in the formulation. Typically, spherical scatterers were assumed to represent the ice particles embedded inside the air medium and Mie phase matrix was applied. However, the real scatterers in the actual snow are generally more irregular than the assumed spherical shape. In this paper, a numerical solution based on the Hierarchical Equivalent Source Algorithm (HESA) has been developed to calculate the phase matrix of scatterers of other shapes to be incorporated in the existing RT formulation. Results from …
Modeling And Simulation Of Microgrid, Ahmad Alzahrani, Mehdi Ferdowsi, Pourya Shamsi, Cihan H. Dagli
Modeling And Simulation Of Microgrid, Ahmad Alzahrani, Mehdi Ferdowsi, Pourya Shamsi, Cihan H. Dagli
Electrical and Computer Engineering Faculty Research & Creative Works
Complex computer systems and electric power grids share many properties of how they behave and how they are structured. A microgrid is a smaller electric grid that contains several homes, energy storage units, and distributed generators. The main idea behind microgrids is the ability to work even if the main grid is not supplying power. That is, the energy storage unit and distributed generation will supply power in that case, and if there is excess in power production from renewable energy sources, it will go to the energy storage unit. Therefore, the electric grid becomes decentralized in terms of control …
Chaotic Behavior In High-Gain Interleaved Dc-Dc Converters, Ahmad Alzahrani, Pourya Shamsi, Mehdi Ferdowsi, Cihan H. Dagli
Chaotic Behavior In High-Gain Interleaved Dc-Dc Converters, Ahmad Alzahrani, Pourya Shamsi, Mehdi Ferdowsi, Cihan H. Dagli
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, chaotic behavior in high gain dc-dc converters with current mode control is explored. The dc-dc converters exhibit some chaotic behavior because they contain switches. Moreover, in power electronics (circuits with more passive elements), the dynamics become rich in nonlinearity and become difficult to capture with linear analytical models. Therefore, studying modeling approaches and analysis methods is required. Most of the high-gain dc-dc boost converters cannot be controlled with only voltage mode control due to the presence of right half plane zero that narrows down the stability region. Therefore, the need of current mode control is necessary to …
An Embeddable Optical Strain Gauge Based On A Buckled Beam, Yang Du, Yizheng Chen, Chen Zhu, Yiyang Zhuang, Jie Huang
An Embeddable Optical Strain Gauge Based On A Buckled Beam, Yang Du, Yizheng Chen, Chen Zhu, Yiyang Zhuang, Jie Huang
Electrical and Computer Engineering Faculty Research & Creative Works
We report, for the first time, a low cost, compact, and novel mechanically designed extrinsic Fabry-Perot interferometer (EFPI)-based optical fiber sensor with a strain amplification mechanism for strain measurement. The fundamental design principle includes a buckled beam with a coated gold layer, mounted on two grips. A Fabry-Perot cavity is produced between the buckled beam and the endface of a single mode fiber (SMF). A ceramic ferrule is applied for supporting and orienting the SMF. The principal sensor elements are packaged and protected by two designed metal shells. The midpoint of the buckled beam will experience a deflection vertically when …
Solar Irradiance Forecasting Using Deep Neural Networks, Ahmad Alzahrani, Pourya Shamsi, Cihan H. Dagli, Mehdi Ferdowsi
Solar Irradiance Forecasting Using Deep Neural Networks, Ahmad Alzahrani, Pourya Shamsi, Cihan H. Dagli, Mehdi Ferdowsi
Electrical and Computer Engineering Faculty Research & Creative Works
Predicting solar irradiance has been an important topic in renewable energy generation. Prediction improves the planning and operation of photovoltaic systems and yields many economic advantages for electric utilities. The irradiance can be predicted using statistical methods such as artificial neural networks (ANN), support vector machines (SVM), or autoregressive moving average (ARMA). However, they either lack accuracy because they cannot capture long-term dependency or cannot be used with big data because of the scalability. This paper presents a method to predict the solar irradiance using deep neural networks. Deep recurrent neural networks (DRNNs) add complexity to the model without specifying …
An Optical Interferometric Triaxial Displacement Sensor For Structural Health Monitoring: Characterization Of Sliding And Debonding For A Delamination Process, Chen Zhu, Yizheng Chen, Yiyang Zhuang, Yang Du, Rex E. Gerald Ii, Yan Tang, Jie Huang
An Optical Interferometric Triaxial Displacement Sensor For Structural Health Monitoring: Characterization Of Sliding And Debonding For A Delamination Process, Chen Zhu, Yizheng Chen, Yiyang Zhuang, Yang Du, Rex E. Gerald Ii, Yan Tang, Jie Huang
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents an extrinsic Fabry-Perot interferometer-based optical fiber sensor (EFPI) for measuring three-dimensional (3D) displacements, including interfacial sliding and debonding during delamination. The idea employs three spatially arranged EFPIs as the sensing elements. In our sensor, the three EFPIs are formed by three endfaces of three optical fibers and their corresponding inclined mirrors. Two coincident roof-like metallic structures are used to support the three fibers and the three mirrors, respectively. Our sensor was calibrated and then used to monitor interfacial sliding and debonding between a long square brick of mortar and its support structure (i.e., a steel base plate) …
Energy-Efficient Fpga-Based Parallel Quasi-Stochastic Computing, Ramu Seva, Prashanthi Metku, Minsu Choi
Energy-Efficient Fpga-Based Parallel Quasi-Stochastic Computing, Ramu Seva, Prashanthi Metku, Minsu Choi
Electrical and Computer Engineering Faculty Research & Creative Works
The high performance of FPGA (Field Programmable Gate Array) in image processing applications is justified by its flexible reconfigurability, its inherent parallel nature and the availability of a large amount of internal memories. Lately, the Stochastic Computing (SC) paradigm has been found to be significantly advantageous in certain application domains including image processing because of its lower hardware complexity and power consumption. However, its viability is deemed to be limited due to its serial bitstream processing and excessive run-time requirement for convergence. To address these issues, a novel approach is proposed in this work where an energy-efficient implementation of SC …
Apparatus And Method For Controlling Dc-Ac Power Conversion, Patrick L. Chapman, Brian T. Kuhn, Robert S. Balog, Jonathan W. Kimball, Philip T. Krein, Alexander Gray, T. Esram
Apparatus And Method For Controlling Dc-Ac Power Conversion, Patrick L. Chapman, Brian T. Kuhn, Robert S. Balog, Jonathan W. Kimball, Philip T. Krein, Alexander Gray, T. Esram
Electrical and Computer Engineering Faculty Research & Creative Works
An apparatus and method for controlling the delivery of power from a DC source to an AC grid includes an inverter configured to deliver power from the unipolar input source to the AC grid and an inverter controller. The inverter includes an input converter, an active filter, and an output converter. The inverter controller includes an input converter controller, an active filter controller and an output converter controller. The input converter controller is configured to control a current delivered by the input converter to a galvanically isolated unipolar bus of the inverter. The output converter is configured to control the …
Using Subdivision Surface Technique To Solve Generalized Debye Sources Based Efie, Xin Fu, Li (Lijun) Jun Jiang, Jie Li, Balasubramaniam Shanker
Using Subdivision Surface Technique To Solve Generalized Debye Sources Based Efie, Xin Fu, Li (Lijun) Jun Jiang, Jie Li, Balasubramaniam Shanker
Electrical and Computer Engineering Faculty Research & Creative Works
In this work, we extend the idea of generalized Debye sources (GDS) method to electric field integral equation (EFIE) and establish a new well-conditioned GDS-EFIE. The principal challenge in implementing this approach arises from the difficulty in developing a robust solver for the surface Laplacian equation. In this paper, we propose using subdivision surfaces that permits such a solution due to the higher order continuous nature of the surface representation. This permits an efficient and effective solution. Thus, GDS-EFIE can be resolved within isogeometric analysis framework as an emerging approach for design-through-analysis. Several numerical results are provided to validate the …
Orbital Angular Momentum Generation From A Defect In Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Orbital Angular Momentum Generation From A Defect In Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
Orbital angular momentum (OAM) is generated from a defect in two-dimensional (2-D) photonic crystals (PC). By breaking the translation symmetry along the two orthogonal directions, the localized defect states can be supported within photonic bandgap of the PC. Particularly, we examine the characteristics of the point defect states along the azimuthal direction by the finite-difference (FD) based eigenvalue analysis. We find that vortex beam carrying OAM can be generated from the defect. The novel design can be easily integrated in optical circuits.
A High Impedance Surface Based Leaky-Wave Antenna Excited By Collimated Surface-Wave, Zi Long Ma, Chi Hou Chan, Kung Bo Ng, Li (Lijun) Jun Jiang
A High Impedance Surface Based Leaky-Wave Antenna Excited By Collimated Surface-Wave, Zi Long Ma, Chi Hou Chan, Kung Bo Ng, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a high impedance surface (HIS) based leaky-wave antenna excited by collimated surface-wave (SW). The proposed antenna consists of a novel SW launcher (SWL) and a carefully designed HIS structure. The SWL employs a substrate-integrated waveguide (SIW) based 2-D offset-fed parabolic reflector and can efficiently generate collimated SW with TM0 mode. On the other hand, the HIS structure is formed by a periodically arranged rectangular microstrip patch array. With the perturbation of the patches, leaky-wave radiation with m=-1 space harmonic mode can be excited. Furthermore, an additional secondary slit is properly designed in each unit cell in the …
Machine Learning Based Method Of Moments (Ml-Mom), He Ming Yao, Li (Lijun) Jun Jiang, Yu Wei Qin
Machine Learning Based Method Of Moments (Ml-Mom), He Ming Yao, Li (Lijun) Jun Jiang, Yu Wei Qin
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes a novel method by rethinking the method of moments (MoM) solving process into a machine learning training process. Based on the artificial neural network (ANN), the conventional MoM matrix is treated as the training data set, based on which machine learning training process becomes conventional linear algebra MoM solving process. The trained result is the solution of MoM. The multiple linear regression (MLR) is utilized to train the model. Amazon Web Service (AWS) is used as the computations platform to utilize the existing hardware and software resources for machine learning. To verify the feasibility of the proposed …
Convolutional Neural Network Based Localized Classification Of Uterine Cervical Cancer Digital Histology Images, Haidar A. Almubarak, R. Joe Stanley, Rodney Long, Sameer Antani, George Thoma, Rosemary Zuna, Shelliane R. Frazier
Convolutional Neural Network Based Localized Classification Of Uterine Cervical Cancer Digital Histology Images, Haidar A. Almubarak, R. Joe Stanley, Rodney Long, Sameer Antani, George Thoma, Rosemary Zuna, Shelliane R. Frazier
Electrical and Computer Engineering Faculty Research & Creative Works
In previous research, we introduced an automated localized, fusion-based algorithm to classify squamous epithelium into Normal, CIN1, CIN2, and CIN3 grades of cervical intraepithelial neoplasia (CIN). The approach partitioned the epithelium into 10 segments. Image processing and machine vision algorithms were used to extract features from each segment. The features were then used to classify the segment and the result was fused to classify the whole epithelium. This research extends the previous research by dividing each of the 10 segments into 3 parts and uses a convolutional neural network to classify the 3 parts. The result is then fused to …
Generalized Debye Sources-Based Efie Solver On Subdivision Surfaces, Xin Fu, Jie Li, Li (Lijun) Jun Jiang, Balasubramaniam Shanker
Generalized Debye Sources-Based Efie Solver On Subdivision Surfaces, Xin Fu, Jie Li, Li (Lijun) Jun Jiang, Balasubramaniam Shanker
Electrical and Computer Engineering Faculty Research & Creative Works
The electric field integral equation is a well-known workhorse for obtaining fields scattered by a perfect electric conducting object. As a result, the nuances and challenges of solving this equation have been examined for a while. Two recent papers motivate the effort presented in this paper. Unlike traditional work that uses equivalent currents defined on surfaces, recent research proposes a technique that results in well-conditioned systems by employing generalized Debye sources (GDS) as unknowns. In a complementary effort, some of us developed a method that exploits the same representation for both the geometry (subdivision surface representations) and functions defined on …
The Comprehensive Handling Of Safety In An Autonomous Robot Capstone Project, John G. Ciezki, Steve Eugene Watkins
The Comprehensive Handling Of Safety In An Autonomous Robot Capstone Project, John G. Ciezki, Steve Eugene Watkins
Electrical and Computer Engineering Faculty Research & Creative Works
A systematic approach to safety issues is described in the context of an autonomous robot capstone project. The treatment of safety should not be an ad hoc or an after-thought aspect of design projects. Engineering students need to consider safety as an integral component of the design process and to identify and address hazards systematically in each stage of project work. Appropriate actions include researching professional standards and regulations, incorporating safety best practices, developing safety checklists and operating protocols, and providing significant safety documentation. Formal safety components were added to a capstone design project for electrical and computer engineering undergraduates …
Discontinuous Galerkin Time-Domain Analysis Of Power-Ground Planes Taking Into Account Decoupling Capacitors, Ping Li, Li (Lijun) Jun Jiang, Hakan Bagci
Discontinuous Galerkin Time-Domain Analysis Of Power-Ground Planes Taking Into Account Decoupling Capacitors, Ping Li, Li (Lijun) Jun Jiang, Hakan Bagci
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a discontinuous Galerkin time-domain (DGTD) method is developed to analyze the power-ground planes taking into account the decoupling capacitors. In the presence of decoupling capacitors, the whole physical system can be split into two subsystems: 1) the field subsystem that is governed by Maxwell's equations that will be solved by the DGTD method, and 2) the circuit subsystem including the capacitor and its parasitic inductor and resistor, which is going to be characterized by the modified nodal analysis algorithm constructed circuit equations. With the aim to couple the two subsystems together, a lumped port is defined over …
Apparatus For Converting Direct Current To Alternating Current Using Multiple Converters, Patrick L. Chapman, Brian T. Kuhn, Robert S. Balog, Jonathan W. Kimball, Philip T. Krein, Alexander Gray
Apparatus For Converting Direct Current To Alternating Current Using Multiple Converters, Patrick L. Chapman, Brian T. Kuhn, Robert S. Balog, Jonathan W. Kimball, Philip T. Krein, Alexander Gray
Electrical and Computer Engineering Faculty Research & Creative Works
An inverter for converting an input direct current (DC) waveform from a DC source to an output alternating current (AC) waveform for delivery to an AC grid includes an input converter, an output converter, and an active filter, each of which is electrically coupled to a bus. The bus may be a DC bus or an AC bus. The input converter is configured to convert the input DC waveform to a DC or AC bus waveform. The output converter is configured to convert the bus waveform to the output AC waveform at a grid frequency. The active filter is configured …
Versatile Optochemical Quantification With Optical Mouse, Altamash Fakki, Salahaldein Ahmed, Jongwon Park, Chang-Soo Kim
Versatile Optochemical Quantification With Optical Mouse, Altamash Fakki, Salahaldein Ahmed, Jongwon Park, Chang-Soo Kim
Electrical and Computer Engineering Faculty Research & Creative Works
There is an ever increasing need for simple, low-cost instruments for ubiquitous medical and environmental measurements in conjunction with networks and Internet-of-things. This work demonstrates that the optical mouse, one of the most common optoelectronic computer peripherals, can be used for chemical quantification. Particularly, we explore the feasibility of using the preassembled optical platform of mouse for oxygen and pH quantification. The image sensor and the light-emitting diode (LED) serve as photodetector and excitation/illumination light source, respectively, while the preinstalled microoptics (e.g., lens and waveguide) provide a fixed optical arrangement convenient for sample analysis. This novel, cost-effective approach demonstrates the …
Transient Heterogeneous Electromagnetic Simulation With Dgtd And Behavioral Macromodel, Huan Huan Zhang, Li (Lijun) Jun Jiang, He Ming Yao, Yu Zhang
Transient Heterogeneous Electromagnetic Simulation With Dgtd And Behavioral Macromodel, Huan Huan Zhang, Li (Lijun) Jun Jiang, He Ming Yao, Yu Zhang
Electrical and Computer Engineering Faculty Research & Creative Works
A novel hybrid field-circuit simulation method is proposed for transient heterogeneous electromagnetic simulations. It adopts the discontinuous Galerkin time domain (DGTD) method and behavioral macromodel trained by artificial neural network to analyze the electromagnetic structure and circuit network, respectively. Due to the feature of DGTD method and behavioral macromodel, the proposed method can handle not only electromagnetic structures with complex geometries and materials but also manage circuits with unknown internal details. It provides a new approach that has the trainable accuracy to meet today's IP projection requestions. It is also the first time for DGTD algorithm to work with the …
Numerical Modeling Of Pcb Power/Ground Plate-Pairs By Dgtd Method Taking Into Account Decoupling Capacitors, Ping Li, Li (Lijun) Jun Jiang, Hakan Baǧci
Numerical Modeling Of Pcb Power/Ground Plate-Pairs By Dgtd Method Taking Into Account Decoupling Capacitors, Ping Li, Li (Lijun) Jun Jiang, Hakan Baǧci
Electrical and Computer Engineering Faculty Research & Creative Works
A discontinuous Galerkin time-domain (DGTD) method is proposed in this work to analyze printed circuit board (PCB) power/ground plate-pair having arbitrarily shaped anti-pads. To apply proper excitation source over the irregular anti-pad, the implemented wave port magnetic current excitation is expanded by the electric eigen-modes of the anti-pad that are calculated via either numerical approach or analytical method. Based on the orthogonality of eigen-modes, the temporal mode expansion coefficient for each mode can be conveniently extracted. Besides, considering the presence of decoupling capacitors, the whole physical system can be split into field and circuit subsystems. For the field subsystem, it …
Discontinuous Galerkin Time-Domain Analysis Of Power/Ground Plate Pairs With Wave Port Excitation, Ping Li, Li (Lijun) Jun Jiang, Hakan Baǧci
Discontinuous Galerkin Time-Domain Analysis Of Power/Ground Plate Pairs With Wave Port Excitation, Ping Li, Li (Lijun) Jun Jiang, Hakan Baǧci
Electrical and Computer Engineering Faculty Research & Creative Works
In this work, a discontinuous Galerkin time-domain method is developed to analyze the power/ground plate pairs taking into account arbitrarily shaped antipads. To implement proper source excitations over the antipads, the magnetic surface current expanded by the electric eigen-modes supported by the corresponding antipad is employed as the excitation. For irregularly shaped antipads, the eigen-modes are obtained by numerical approach. Accordingly, the methodology for the S-parameter extraction is derived based on the orthogonal properties of the different modes. Based on the approach, the transformation between different modes can be readily evaluated.
Electromagnetic-Circuit Cosimulation Based On Hybrid Explicit-Implicit Dgtd And Sbf Macromodel, Ping Yuan, Huan Huan Zhang, Li (Lijun) Jun Jiang, Daniel Garcia Donoro, Yu Zhang
Electromagnetic-Circuit Cosimulation Based On Hybrid Explicit-Implicit Dgtd And Sbf Macromodel, Ping Yuan, Huan Huan Zhang, Li (Lijun) Jun Jiang, Daniel Garcia Donoro, Yu Zhang
Electrical and Computer Engineering Faculty Research & Creative Works
The integrated circuits usually have multiscale feature. If utilizing the explicit discontinuous Galerkin time domain (DGTD) method for electromagnetic-circuit cosimulation, the time step size will be limited to the minimum grid size according to CFL (Courant-Friedrichs-Lewy) condition, which will lead to a small time step size. In order to improve the simulation efficiency, this paper adopts the hybrid explicit-implicit DGTD coupled with the Sigmoidal basis function (SBF) macromodel to achieve electromagnetic-circuit cosimulation.
Fuzzy Color Clustering For Melanoma Diagnosis In Dermoscopy Images, Haidar A. Almubarak, R. Joe Stanley, William V. Stoecker, Randy Hays Moss
Fuzzy Color Clustering For Melanoma Diagnosis In Dermoscopy Images, Haidar A. Almubarak, R. Joe Stanley, William V. Stoecker, Randy Hays Moss
Electrical and Computer Engineering Faculty Research & Creative Works
A fuzzy logic-based color histogram analysis technique is presented for discriminating benign skin lesions from malignant melanomas in dermoscopy images. The approach extends previous research for utilizing a fuzzy set for skin lesion color for a specified class of skin lesions, using alpha-cut and support set cardinality for quantifying a fuzzy ratio skin lesion color feature. Skin lesion discrimination results are reported for the fuzzy clustering ratio over different regions of the lesion over a data set of 517 dermoscopy images consisting of 175 invasive melanomas and 342 benign lesions. Experimental results show that the fuzzy clustering ratio applied over …
Task Assignment And Path Planning For Multiple Autonomous Underwater Vehicles Using 3d Dubins Curves, Wenyu Cai, Meiyan Zhang, Y. Rosa Zheng
Task Assignment And Path Planning For Multiple Autonomous Underwater Vehicles Using 3d Dubins Curves, Wenyu Cai, Meiyan Zhang, Y. Rosa Zheng
Electrical and Computer Engineering Faculty Research & Creative Works
This paper investigates the task assignment and path planning problem for multiple AUVs in three dimensional (3D) underwater wireless sensor networks where nonholonomic motion constraints of underwater AUVs in 3D space are considered. The multi-target task assignment and path planning problem is modeled by the Multiple Traveling Sales Person (MTSP) problem and the Genetic Algorithm (GA) is used to solve the MTSP problem with Euclidean distance as the cost function and the Tour Hop Balance (THB) or Tour Length Balance (TLB) constraints as the stop criterion. The resulting tour sequences are mapped to 2D Dubins curves in the X − …
Electronic Receiver Device Detection System And Method, Jagannathan Sarangapani, Maciej Jan Zawodniok, Vivek Thotla, Mohammad Tayeb Ahmad Ghasr, Jake Hertenstein
Electronic Receiver Device Detection System And Method, Jagannathan Sarangapani, Maciej Jan Zawodniok, Vivek Thotla, Mohammad Tayeb Ahmad Ghasr, Jake Hertenstein
Electrical and Computer Engineering Faculty Research & Creative Works
A super regenerative receiver detection system and method that includes a computing system that stores and executes a cross modulation correlation component to modulate a radio-frequency (RF) stimulation signal that is transmitted in an area using a modulating signal having a first modulating mode, and receive a response UEE signal from the area in which the response UEE signal includes a cross modulated signal emitted from a super regenerative receiver (SRR). The cross modulated signal having a second modulation mode that is different from the first modulation mode. Using this information, the cross modulation correlation component processes the received UEE …
Antenna Design For Small Uav Locator Applications, Randall L. Musselman, Steve Eugene Watkins
Antenna Design For Small Uav Locator Applications, Randall L. Musselman, Steve Eugene Watkins
Electrical and Computer Engineering Faculty Research & Creative Works
An antenna design problem is presented for a small UAV application. A UAV locator system must include an on-board transmitter with the capability to provide a beacon signal, in the event of a crash, and a receiver that is tailored for a transmitter hunt. This specific context for applying antenna theory allows a variety of design constraints, technical approaches, performance measures, and required results. The paper provides a structure for organizing the material, example approaches that illustrate possible design choices, and recommendations on educational implementation.
Transient Thermal Analysis Of 3-D Integrated Circuits Packages By The Dgtd Method, Ping Li, Yilin Dong, Min Tang, Junfa Mao, Li (Lijun) Jun Jiang, Hakan Bagci
Transient Thermal Analysis Of 3-D Integrated Circuits Packages By The Dgtd Method, Ping Li, Yilin Dong, Min Tang, Junfa Mao, Li (Lijun) Jun Jiang, Hakan Bagci
Electrical and Computer Engineering Faculty Research & Creative Works
Since accurate thermal analysis plays a critical role in the thermal design and management of the 3-D system-level integration, in this paper, a discontinuous Galerkin time-domain (DGTD) algorithm is proposed to achieve this purpose. Such as the parabolic partial differential equation (PDE), the transient thermal equation cannot be directly solved by the DGTD method. To address this issue, the heat flux, as an auxiliary variable, is introduced to reduce the Laplace operator to a divergence operator. The resulting PDE is hyperbolic, which can be further written into a conservative form. By properly choosing the definition of the numerical flux used …
Microstrip Diplexer With Low Channel-Frequency Ratio, Kirti Dhwaj, Li (Lijun) Jun Jiang, Tatsuo Itoh
Microstrip Diplexer With Low Channel-Frequency Ratio, Kirti Dhwaj, Li (Lijun) Jun Jiang, Tatsuo Itoh
Electrical and Computer Engineering Faculty Research & Creative Works
The paper presents a microstrip diplexer constructed by joining two stub-perturbed ring resonators at a T-junction. Each ring resonator acts as a bandpass filter with a transmission zero lying very close to the passband of the other filter, thereby increasing the isolation between the two channels. A short stub is additionally added at the T-junction to improve the matching at the common port. The diplexer is able to achieve a channel separation of 50 MHz, with the two channels centered at 2.49 GHz and 2.37 GHz respectively. This translates to a center frequency ratio of 1.05 between the two channels, …
Fast Monostatic Scattering Analysis Based On Bayesian Compressive Sensing, Huan Huan Zhang, Wei E.I. Sha, Li (Lijun) Jun Jiang
Fast Monostatic Scattering Analysis Based On Bayesian Compressive Sensing, Huan Huan Zhang, Wei E.I. Sha, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
In conjugation with the method of moments, the Bayesian compressive sensing algorithm is utilized to fast analyze the monostatic electromagnetic scattering problem. Different from the orthogonal matching pursuit based compressive sensing approach that cannot determine the required measurement times, the proposed method overcomes the difficulty by adopting the Bayesian framework to recover the underlying signal. Error bars of the signal can be obtained in the recovery procedure, which offers a way to adaptively determine the number of compressive-sensing measurements.