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Articles 1171 - 1200 of 3518
Full-Text Articles in Engineering
Survivability Evaluation Of Gas, Water And Electricity Infrastructures, Alberto A. Avritzer, Laura Carnevali, Hamed Ghasemieh, Lucia Happe, Boudewijn R. H. M. Haverkort, Anne Koziolek, Daniel Sadoc Menasche, Anne Remke, Sahra Sedigh, Enrico Vicario
Survivability Evaluation Of Gas, Water And Electricity Infrastructures, Alberto A. Avritzer, Laura Carnevali, Hamed Ghasemieh, Lucia Happe, Boudewijn R. H. M. Haverkort, Anne Koziolek, Daniel Sadoc Menasche, Anne Remke, Sahra Sedigh, Enrico Vicario
Electrical and Computer Engineering Faculty Research & Creative Works
The infrastructures used in cities to supply power, water and gas are consistently becoming more automated. As society depends critically on these cyber-physical infrastructures, their survivability assessment deserves more attention. In this overview, we first touch upon a taxonomy on survivability of cyber-physical infrastructures, before we focus on three classes of infrastructures (gas, water and electricity) and discuss recent modelling and evaluation approaches and challenges.
Thevenin Equivalence In Disorderless Quantum Networks, C. A. Cain, Cheng-Hsiao Wu
Thevenin Equivalence In Disorderless Quantum Networks, C. A. Cain, Cheng-Hsiao Wu
Electrical and Computer Engineering Faculty Research & Creative Works
We outline the procedure of extending the Thévenin equivalence principle for classical electric circuits to reducing Aharonov-Bohm-based quantum networks into equivalent models. With examples, we show from first principles how the requirements are related to the electron band structure's Fermi level and the lattice spacing of the network. Quantum networks of varying degrees of coupling strength from four basic classifications of single and double entangled loops sharing symmetry and highly correlated band structures are used to demonstrate the concept. We show the limitations of how the principle may be applied. Several classes of examples are given and their equivalent forms …
Low Complexity Polynomial Expansion Detector For Massive Mimo Uplink With Multiple-Antenna Users, An An Lu, Xiqi Gao, Chengshan Xiao
Low Complexity Polynomial Expansion Detector For Massive Mimo Uplink With Multiple-Antenna Users, An An Lu, Xiqi Gao, Chengshan Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a low complexity polynomial expansion (PE) detector for massive multi-input multi-output (MIMO) uplink transmissions is proposed. In contrast to most massive MIMO systems in the literature, where single-antenna user equipment's (UEs) are assumed, multiple-antenna UEs are employed in this paper. Furthermore, each link between a user and the base station forms a jointly correlated Rician fading channel. The PE detector reduces the complexity of the minimum mean square error (MMSE) detector by replacing the matrix inversion with an approximate matrix polynomial. In the design of the low complexity PE detector, the approximations of the moments of the …
Linear Precoding For The Mimo Multiple Access Channel With Finite Alphabet Inputs And Statistical Csi, Yongpeng Wu, Chao Kai Wen, Chengshan Xiao, Xiqi Gao, Robert Schober
Linear Precoding For The Mimo Multiple Access Channel With Finite Alphabet Inputs And Statistical Csi, Yongpeng Wu, Chao Kai Wen, Chengshan Xiao, Xiqi Gao, Robert Schober
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we investigate the design of linear precoders for the multiple-input-multiple-output (MIMO) multiple access channel (MAC). We assume that statistical channel state information (CSI) is available at the transmitters and consider the problem under the practical finite alphabet input assumption. First, we derive an asymptotic (in the large system limit) expression for the weighted sum rate (WSR) of the MIMO MAC with finite alphabet inputs and Weichselberger's MIMO channel model. Subsequently, we obtain the optimal structures of the linear precoders of the users maximizing the asymptotic WSR and an iterative algorithm for determining the precoders. We show that …
An Efficient Linear Precoding Algorithm For Energy Harvesting Transmitter With Finite-Alphabet Inputs And Instantaneous Csi, Xiaodong Zhu, Weiliang Zeng, Chengshan Xiao
An Efficient Linear Precoding Algorithm For Energy Harvesting Transmitter With Finite-Alphabet Inputs And Instantaneous Csi, Xiaodong Zhu, Weiliang Zeng, Chengshan Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
This paper investigates the precoder design in multiple-input multiple-output (MIMO) systems with energy harvester. The objective is to maximize the sum of mutual information (MI) over multiple time slots with causal knowledge of energy arrivals. Different from existing works, the system is considered with finite-alphabet inputs, and the transmitter is assumed to know not only the statistical channel state information (CSI) but also the instantaneous CSI of the current time slot at the beginning of each time slot. The optimal precoder design leads to an intractable multi- dimensional matrix optimization problem. We show that this difficult optimization problem can be …
Time-Domain Partial Element Equivalent Circuit Solver Including Non-Linear Magnetic Materials, Daniele Romano, Giulio Antonini, Albert E. Ruehli
Time-Domain Partial Element Equivalent Circuit Solver Including Non-Linear Magnetic Materials, Daniele Romano, Giulio Antonini, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
The PEEC solution of problems which include magnetic materials has recently been considered. Most of these solvers include linear magnetic material only. In this paper, we present a new PEEC solver including non-linear magnetic materials. A benchmark problem is presented in the time domain where the magnetic material operates in the non-linear region.
Real Time Mission Planning, Emad William Saad, Stefan Richard Bieniawski, Riley Pigg, Paul Edward, John Lyle Vian, Paul Michael Robinette, Donald C. Wunsch
Real Time Mission Planning, Emad William Saad, Stefan Richard Bieniawski, Riley Pigg, Paul Edward, John Lyle Vian, Paul Michael Robinette, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
The different advantageous embodiments provide a system comprising a number of computers, a graphical user interface, first program code stored on the computer, and second program code stored on the computer. The graphical user interface is executed by a computer in the number of computers. The computer is configured to run the first program code to define a mission using a number of mission elements. The computer is configured to run the second program code to generate instructions for a number of assets to execute the mission and monitor the number of assets during execution of the mission.
One-Dimensional Triple Periodic Dual-Beam Microstrip Leaky-Wave Antenna, Zi Long Ma, Li (Lijun) Jun Jiang
One-Dimensional Triple Periodic Dual-Beam Microstrip Leaky-Wave Antenna, Zi Long Ma, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
In this letter, a novel dual-beam microstrip leaky-wave antenna based on one-dimensional triple periodic (TP) structure is proposed. Through theoretical dispersion relation analysis, it is found that compared to the conventional periodic structure, TP structure has reduced the separation of space harmonics. Hence, more space harmonic modes are brought into the leaky-wave radiation region. Through proper design, m = - 1 and m = - 2 modes are excited simultaneously. Consequently, the forward and backward propagation waves of these two modes generate two radiation beams in the far-field region. At different frequencies, symmetrical and asymmetrical beam pairs are realized. It …
Network Attack Experimentation Using Openflow-Enabled Geni Testbed, Mani Chaitanya Gorla, Venu Madhav Kamaraju, Egemen K. Çetinkaya
Network Attack Experimentation Using Openflow-Enabled Geni Testbed, Mani Chaitanya Gorla, Venu Madhav Kamaraju, Egemen K. Çetinkaya
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
Sensing Performance Study Of Sic, A Wide Bandgap Semiconductor Material Platform For Surface Plasmon Resonance Sensor, Wei Du, Feng Zhao
Sensing Performance Study Of Sic, A Wide Bandgap Semiconductor Material Platform For Surface Plasmon Resonance Sensor, Wei Du, Feng Zhao
Electrical and Computer Engineering Faculty Research & Creative Works
The sensing properties of a surface plasmon resonance (SPR) based waveguide sensor on a wide bandgap semiconductor, silicon carbide (SiC), were studied. Compared to other waveguide sensors, the large bandgap energy of SiC material allows the sensor to operate in the visible and near infrared wavelength range, while the SPR effect by a thin gold film is expected to improve the sensitivity. The confinement factor of the sensor at various wavelengths of the incident light and refractive index of the analyte were investigated using an effective index method. Since the change of analyte type and concentration is reflected by the …
Big Data -- A 21st Century Science Maginot Line? No-Boundary Thinking: Shifting From The Big Data Paradigm, Xiuzhen Huang, Steven F. Jennings, Barry Bruce, Alison Buchan, Liming Cai, Pengyin Chen, Carole Cramer, Weihua Guan, Uwe Kk Hilgert, Hongmei Jiang, Zenglu Li, Gail Mcclure, Donald F. Mcmullen, Bindu Nanduri, Andy Perkins, Bhanu Rekepalli, Saeed Salem, Jennifer Specker, Karl Walker, Donald C. Wunsch, Donghai Xiong, Shuzhong Zhang, Yu Zhang, Zhongming Zhao, Jason H. Moore
Big Data -- A 21st Century Science Maginot Line? No-Boundary Thinking: Shifting From The Big Data Paradigm, Xiuzhen Huang, Steven F. Jennings, Barry Bruce, Alison Buchan, Liming Cai, Pengyin Chen, Carole Cramer, Weihua Guan, Uwe Kk Hilgert, Hongmei Jiang, Zenglu Li, Gail Mcclure, Donald F. Mcmullen, Bindu Nanduri, Andy Perkins, Bhanu Rekepalli, Saeed Salem, Jennifer Specker, Karl Walker, Donald C. Wunsch, Donghai Xiong, Shuzhong Zhang, Yu Zhang, Zhongming Zhao, Jason H. Moore
Electrical and Computer Engineering Faculty Research & Creative Works
Whether your interests lie in scientific arenas, the corporate world, or in government, you have certainly heard the praises of big data: Big data will give you new insights, allow you to become more efficient, and/or will solve your problems. While big data has had some outstanding successes, many are now beginning to see that it is not the Silver Bullet that it has been touted to be. Here our main concern is the overall impact of big data; the current manifestation of big data is constructing a Maginot Line in science in the 21st century. Big data is not …
Teaching Engineering Ethics, Steve Eugene Watkins
Teaching Engineering Ethics, Steve Eugene Watkins
Electrical and Computer Engineering Faculty Research & Creative Works
Instruction in engineering ethics is an important aspect of professional development. For universities, it is an element of program assessment and is considered for accreditation. For engineering students, it addresses relationships in professional life and is a topic for professional licensure. A common instructional objective is for students to have an ability to continue developing their ethical knowledge and judgment. Topical content typically includes an introduction to principles of applied ethics with supporting examples of related engineering situations. This paper discusses the organization of the ethics component in a senior seminar course. Key topics are ethics principles in the context …
Investigation Of Thermoelectric Properties Of P-Type Gan Thin Films, Bahadir Kucukgok, Babar Hussain, Chuanle Zhou, Ian T. Ferguson, Na Lu
Investigation Of Thermoelectric Properties Of P-Type Gan Thin Films, Bahadir Kucukgok, Babar Hussain, Chuanle Zhou, Ian T. Ferguson, Na Lu
Electrical and Computer Engineering Faculty Research & Creative Works
GaN and its alloys are promising candidates for high temperature thermoelectric (TE) materials due to their high Seebeck coefficient and high thermal and mechanical stability. Moreover, these materials can overcome the toxicity concern of current Te-based TE materials, such as BI2Te3 and PbTe. These materials have recently shown a higher Seebeck coefficient than that of SiGe in high temperature region because their large bandgap characteristic eliminates the bipolar conduction. In this study, we report the room temperature thermoelectric properties of p-type Mg doped GaN, grown by metalorganic chemical vapor deposition (MOCVD) on sapphire substrate with various carrier …
Mode-Multiplexed Transmission Over Conventional Graded-Index Multimode Fibers, Roland Ryf, Nicolas K. Fontaine, H. Chen, B. Guan, B. Huang, Mina Esmaeelpour
Mode-Multiplexed Transmission Over Conventional Graded-Index Multimode Fibers, Roland Ryf, Nicolas K. Fontaine, H. Chen, B. Guan, B. Huang, Mina Esmaeelpour
Electrical and Computer Engineering Faculty Research & Creative Works
We present experimental results for combined mode-multiplexed and wavelength multiplexed transmission over conventional graded-index multimode fibers. We use mode-selective photonic lanterns as mode couplers to precisely excite a subset of the modes of the multimode fiber and additionally to compensate for the differential group delay between the excited modes. Spatial mode filters are added to suppress undesired higher order modes. We transmit 30-Gbaud QPSK signals over 60 WDM channels, 3 spatial modes, and 2 polarizations, reaching a distance of 310 km based on a 44.3 km long span. We also report about transmission experiments over 6 spatial modes for a …
Stochastic Adaptive Event-Triggered Control And Network Scheduling Protocol Co-Design For Distributed Networked Systems, Hao Xu, Avimanyu Sahoo, Sarangapani Jagannathan
Stochastic Adaptive Event-Triggered Control And Network Scheduling Protocol Co-Design For Distributed Networked Systems, Hao Xu, Avimanyu Sahoo, Sarangapani Jagannathan
Electrical and Computer Engineering Faculty Research & Creative Works
In a distributed 'networked control system' (NCS), multiple physical systems or agents are connected to their corresponding controllers through a shared packet-switched communication network. For such distributed NCS, periodic sampled controller design is unsuitable to handle packet-switched closed-loop control systems, and a novel stochastic optimal adaptive event-sampled controller scheme is proposed in the application layer for each physical system or agent expressed as an uncertain linear dynamic system. Lyapunov stability analysis will be utilized to derive the event trigger condition. In addition, a network scheduling protocol is also required for such NCS. Traditional network scheduling protocols are unsuitable for such …
Vehicle Base Station, Emad William Saad, John L. Vian, Matthew A. Vavrina, Jared A. Nisbett, Donald C. Wunsch
Vehicle Base Station, Emad William Saad, John L. Vian, Matthew A. Vavrina, Jared A. Nisbett, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
A system to load and unload material from a vehicle comprises a vehicle base station and an assembly to autonomously load and unload material from the vehicle.
Stability Design Criteria For Distribution Systems With Solid-State Transformers, Darshit G. Shah, M. L. Crow
Stability Design Criteria For Distribution Systems With Solid-State Transformers, Darshit G. Shah, M. L. Crow
Electrical and Computer Engineering Faculty Research & Creative Works
Due to recent advancements in semiconductor technology, power-electronic converters for high-voltage, high-power, and high-frequency applications will soon be commercially available. The theoretical concept of a distribution solid-state transformer (SST) is not recent, but with the use of advanced electronic switches and control strategies, the SST may soon become a practical reality. In this paper, conventional single-phase distribution transformers are replaced by solid-state transformers in a distribution test system to investigate their interactive dynamics. Under certain circumstances, instabilities due to harmonic resonance are observed. A design criterion for a solid-state transformer during no-load conditions has been proposed in order to avoid …
Secure Degrees Of Freedom For The Mimo Wiretap Channel With A Multiantenna Cooperative Jammer, Mohamed Nafea, Aylin Yener
Secure Degrees Of Freedom For The Mimo Wiretap Channel With A Multiantenna Cooperative Jammer, Mohamed Nafea, Aylin Yener
Electrical and Computer Engineering Faculty Research & Creative Works
A multiple antenna Gaussian wiretap channel with a multiantenna cooperative jammer (CJ) is considered and the secure degrees of freedom (s.d.o.f.), with N antennas at the sender, receiver, and eavesdropper, is derived for all possible values of the number of antennas at the cooperative jammer, K. In particular, the upper and lower bounds for the s.d.o.f. are provided for different ranges of K and shown to coincide. Gaussian signaling both for transmission and jamming is shown to be sufficient to achieve the s.d.o.f. of the channel, when the s.d.o.f. is integer valued. By contrast, when the channel has a non-integer …
Neural Network Dynamic Progamming Constrained Control Of Distributed Parameter Systems Governed By Parabolic Partial Differential Equations With Application To Diffusion-Reaction Processes, Behzad Talaei, Hao Xu, S. Jagannathan
Neural Network Dynamic Progamming Constrained Control Of Distributed Parameter Systems Governed By Parabolic Partial Differential Equations With Application To Diffusion-Reaction Processes, Behzad Talaei, Hao Xu, S. Jagannathan
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a novel neural network (NN) adaptive dynamic programming (ADP) control scheme for distributed parameter systems (DPS) governed by parabolic partial differential equations (PDE) is introduced in the presence of control constraints and unknown system dynamics. First, Galerkin method is utilized to develop a relevant reduced order system which captures the dominant dynamics of the DPS. Subsequently, a novel control scheme is proposed over finite horizon by using NN ADP. To relax the requirement of system dynamics, a novel NN identifier is developed. More-over, a second NN is proposed to estimate online the time-varying non-quadratic value function from …
Clustering-Based Methodology For Optimal Residential Time Of Use Design Structure, Maigha, M. L. Crow
Clustering-Based Methodology For Optimal Residential Time Of Use Design Structure, Maigha, M. L. Crow
Electrical and Computer Engineering Faculty Research & Creative Works
A price responsive demand (PRD) market has been perceived as the future of electricity markets with the capability of achieving economic benefits. It lays the foundation of demand response at the customer level. Time of use structures have been implemented widely to achieve load reshaping. This paper introduces a clustering-based methodology for obtaining optimal time of use structures (optimal number of levels and rate durations) based on historical load profiles and real-time prices. The study takes into account variation in weekday and weekend load profiles and also seasonal variations. A new hybrid policy that bridges the gap between seasonal time-of-use …
Robust Adaptive Channel Estimation In Mimo Underwater Acoustic Communications, Zengli Yang, Yahong Rosa Zheng
Robust Adaptive Channel Estimation In Mimo Underwater Acoustic Communications, Zengli Yang, Yahong Rosa Zheng
Electrical and Computer Engineering Faculty Research & Creative Works
For underwater acoustic (UWA) communications, a robust iterative channel estimation based minimum mean-square-error (MMSE) adaptive turbo equalizer is proposed and studied for multiple-input multiple-output (MIMO) detection. Rather than the classical MMSE or normalized least mean squares (NLMS) estimation algorithms, the improved proportionate NLMS (IPNLMS) is adopted for the iterative MIMO channel estimator. The MIMO channel estimation is performed jointly with the MMSE equalizer and the maximum a posteriori probability (MAP) decoder. With inter-block interference removed, the MIMO MMSE equalization is performed with overlapped information subblocks without guard intervals, thus a high transmission efficiency is guaranteed, and performance degradation is prevented. …
A New Approach For Efficient Analysis Of Large Finite Periodic Structures, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha, Fan Yang
A New Approach For Efficient Analysis Of Large Finite Periodic Structures, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha, Fan Yang
Electrical and Computer Engineering Faculty Research & Creative Works
Periodic structures have attracted much attention in the past decades due to numerous applications such as metamaterials, antenna arrays, frequency selective surface (FSS), photonic band gap (PBG) or electromagnetic band gap (EBG) structures, etc. Infinite periodic structures are impossible in a realistic fabrication. When truncating infinite periodic structures, discontinuities occur at the interface and surface waves will be excited according to mode conversion, which leads to the edge effect of finite periodic structures. The prediction of wave natures in the edge cells of finite periodic structures is an indispensable procedure during the design of finite periodic structures. The conventional element-by-element …
Distributive Radiation Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli
Distributive Radiation Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
The intentional and unintentional radiations are of great importance to wireless power transfer at the low frequency regime and antenna signal transportation at the higher frequency regime. Due to the rising speed of digital systems and thereby broad bandwidth of signal channels at all levels of electronic devices, it becomes more essential than ever to quantitively analyze, model, and illustrate how the energy is leaked out and which part is a greater contributor to the wanted or unwanted radiation.
Predicting Solar Irradiance Using Time Series Neural Networks, Ahmad Alzahrani, Jonathan W. Kimball, Cihan H. Dagli
Predicting Solar Irradiance Using Time Series Neural Networks, Ahmad Alzahrani, Jonathan W. Kimball, Cihan H. Dagli
Electrical and Computer Engineering Faculty Research & Creative Works
Increasing the accuracy of prediction improves the performance of photovoltaic systems and alleviates the effects of intermittence on the systems stability. A Nonlinear Autoregressive Network with Exogenous Inputs (NARX) approach was applied to the Vichy-Rolla National Airport's photovoltaic station. The proposed model uses several inputs (e.g. time, day of the year, sky cover, pressure, and wind speed) to predict hourly solar irradiance. Data obtained from the National Solar Radiation Database (NSRDB) was used to conduct simulation experiments. These simulations validate the use of the proposed model for short-term predictions. Results show that the NARX neural network notably outperformed the other …
Calderón Preconditioned Pmchwt Equations For Analyzing Penetrable Objects In Layered Medium, Yongpin P. Chen, Lijun Jiang, Sheng Sun, Weng Cho Chew, Jun Hu
Calderón Preconditioned Pmchwt Equations For Analyzing Penetrable Objects In Layered Medium, Yongpin P. Chen, Lijun Jiang, Sheng Sun, Weng Cho Chew, Jun Hu
Electrical and Computer Engineering Faculty Research & Creative Works
We study Calderón preconditioners for analyzing electromagnetic scattering by penetrable objects in a layered medium. To account for the scattering effects of the multilayered background, the layered medium Green's function is adopted in the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) method. However, similar to the free-space case, the spectrum of the resulting equation is undesirable. This leads to a slow convergence of an iterative solver, especially when the geometry is densely meshed. To improve the convergence, a highly effective preconditioner is proposed. Different from its free-space counterpart, the preconditioning operator is constructed based on the Calderón identities for inhomogeneous medium. To reduce the relatively …
Runtime Self-Calibrated Temperature-Stress Cosensor For 3-D Integrated Circuits, Chun Zhang, Dian Ma, Changzhi Li, Yiyu Shi
Runtime Self-Calibrated Temperature-Stress Cosensor For 3-D Integrated Circuits, Chun Zhang, Dian Ma, Changzhi Li, Yiyu Shi
Electrical and Computer Engineering Faculty Research & Creative Works
On-chip temperature and stress sensors are important for runtime system management techniques tackling thermomechanical reliability issues in 3-D integrated circuits (ICs). However, traditional temperature and stress sensor designs require large calibration overhead to improve accuracy, which incurs significant cost for massive production. To address the challenge, in this paper, we propose a novel temperature-stress cosensor design for 3-D ICs. By exploring the inherent reciprocity of temperature and stress mechanisms, it achieves runtime self-calibration such that no dedicated calibration effort is needed. Simulation results show that the cosensor achieves 0.26 C and 0.43 MPa accuracy on average in temperature and stress …
Localization Of Near-Field Radio Controlled Unintended Emitting Sources In The Presence Of Multipath Fading, Nurbanu Guzey, Hao Xu, Sarangapani Jagannathan
Localization Of Near-Field Radio Controlled Unintended Emitting Sources In The Presence Of Multipath Fading, Nurbanu Guzey, Hao Xu, Sarangapani Jagannathan
Electrical and Computer Engineering Faculty Research & Creative Works
Localization of near-field unintended emitting radio controlled (RC) devices under a multipath environment is considered in this paper using a uniform linear array (ULA). Since received signals are dependent on both angle of arrival (AoA) and distance from the RC devices to the ULA in the near-field scenario, traditional localization schemes based on received signal strength indicator, time difference in arrival, which only estimate either AoA or distance, are unsuitable. Therefore, a novel smooth 2-D multiple signal classification (MUSIC) near-field localization scheme is developed to locate RC devices under a multipath environment with a possible location error of 0.5 m. …
Generalized Natural Mode Expansion For Arbitrary Electromagnetic Fields, Q. I. Dai, W. C. Chew, L. (Lijun) J. Jiang
Generalized Natural Mode Expansion For Arbitrary Electromagnetic Fields, Q. I. Dai, W. C. Chew, L. (Lijun) J. Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A generalized natural mode expansion theory for investigating arbitrary electromagnetic fields is presented. When an inhomogeneity is bounded with impenetrable boundaries, the field excited by arbitrary sources is expanded with a complete set of eigenmodes, which are classified into trapped modes and exterior modes. As the boundaries tend to infinity, trapped modes remain unchanged, while exterior modes form a continuum. In numerical studies, unbounded systems can be emulated by placing perfectly matched layers (PMLs) at finite extent. Simulation shows that only a few natural modes are prominent in expanding the excited field in a properly functioning device. Such a reduced …
An Adaptive Hierarchical Sparse Grid Collocation Method For Stochastic Scattering Systems Analysis, Ping Li, Li (Lijun) Jun Jiang
An Adaptive Hierarchical Sparse Grid Collocation Method For Stochastic Scattering Systems Analysis, Ping Li, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
To quantify the impacts of random inputs on hybrid electromagnetics (EM)-circuit systems or EM scattering from objects, an adaptive hierarchical sparse grid collocation (ASGC) algorithm combined with discontinuous Galerkin time-domain (DGTD) method is presented in this work. As a stochastic polynomial chaos modality, the ASGC method approximates the interested stochastic observables using interpolation functions over a set of collocation points. Instead of employing a full-tensor product sense, the collocation points in ASGC method are hierarchically marched with interpolation level based on Smolyak's algorithm. To further reduce the collocation points, the hierarchical surplus is used as the error indicator for each …
Beam-Switchable Magneto-Electric Antenna Array Based On Composite Right/Left-Handed (Crlh) Structures, Shulabh Gupta, Li (Lijun) Jun Jiang
Beam-Switchable Magneto-Electric Antenna Array Based On Composite Right/Left-Handed (Crlh) Structures, Shulabh Gupta, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
The beam-switching characteristics of Magneto-Electric (ME) dipole antenna array is presented based on differentially exciting the two ports of the array with different polarities. The proposed principle is demonstrated using full-wave simulations that the depending on the polarity of the two excitations, either a magnetic-dipole or an electric-dipole radiation can be selectively achieved.