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Electrical and Computer Engineering
Electrical and Computer Engineering Faculty Research & Creative Works
- Keyword
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- Electric Utilities (3)
- Calderón preconditioner (2)
- Cascading Tripping (2)
- Fabry-Perot interferometers (2)
- Intelligent Systems (2)
-
- Interferometry (2)
- Layered medium Green's function (2)
- Leaky-wave antenna (2)
- Method of moments (2)
- Monte Carlo Methods (2)
- Monte Carlo Simulation (2)
- N-1 Contingencies (2)
- Optical fibers (2)
- Surface integral equations (2)
- Temperature (2)
- Voltage Security (2)
- Voltage Security Region (2)
- Wind Power (2)
- 3d Locations (1)
- Adaptive Systems (1)
- Advanced Encryption Standard (1)
- Air-Coupled (1)
- Analog signal processing (1)
- Antenna array (1)
- Apoptosis (1)
- Apoptosis Regulatory Protein (1)
- Apoptosis Regulatory Proteins (1)
- Balanced transmission line (1)
- Balloons (1)
- Band-to-band tunneling (BTBT) (1)
Articles 31 - 58 of 58
Full-Text Articles in Engineering
Simultaneous Measurement Of Temperature And Pressure With Cascaded Extrinsic Fabry-Perot Interferometer And Intrinsic Fabry-Perot Interferometer Sensors, Yinan Zhang, Jie Huang, Xinwei Lan, Lei Yuan, Hai Xiao
Simultaneous Measurement Of Temperature And Pressure With Cascaded Extrinsic Fabry-Perot Interferometer And Intrinsic Fabry-Perot Interferometer Sensors, Yinan Zhang, Jie Huang, Xinwei Lan, Lei Yuan, Hai Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents an approach for simultaneous measurement of temperature and pressure using miniaturized fiber inline sensors. The approach utilizes the cascaded optical fiber inline intrinsic Fabry-Perot interferometer and extrinsic Fabry-Perot interferometer as temperature and pressure sensing elements, respectively. A CO2 laser was used to create a loss between them to balance their reflection power levels. The multiplexed signals were demodulated using a Fast Fourier transform-based wavelength tracking method. Experimental results showed that the sensing system could measure temperature and pressure unambiguously in a pressure range of 0 to 6.895 x 105 Pa and a temperature range from …
Nondestructive Evaluation Of Mechanically Stabilized Earth Walls With Frequency-Modulated Continuous Wave (Fm-Cw) Radar, Mohammad Tayeb Ahmad Ghasr, Yi Bao, Kuang Ying, K. M. Combs, R. Zoughi, Genda Chen
Nondestructive Evaluation Of Mechanically Stabilized Earth Walls With Frequency-Modulated Continuous Wave (Fm-Cw) Radar, Mohammad Tayeb Ahmad Ghasr, Yi Bao, Kuang Ying, K. M. Combs, R. Zoughi, Genda Chen
Electrical and Computer Engineering Faculty Research & Creative Works
Effective techniques for a nondestructive evaluation of mechanically stabilized earth (MSE) walls during normal operation or immediately after an earthquake event are yet to be developed. MSE walls often have a rough surface finishing for the purpose of decoration and are reinforced with both horizontal and vertical steel bars. Two wide-band microwave inspection approaches were investigated for detecting and evaluating characteristics of materials behind an MSE wall section. The first approach used spot measurements with a wide-band frequency-modulated continuous wave (FM-CW) radar system. While effective to penetrate through mortar blocks in the laboratory, the radar system was found to have …
Log-Periodic Dipole Array Antenna As Chipless Rfid Tag, S. Gupta, Gui Jun Li, R. C. Roberts, Li (Lijun) Jun Jiang
Log-Periodic Dipole Array Antenna As Chipless Rfid Tag, S. Gupta, Gui Jun Li, R. C. Roberts, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A passive chipless radio-frequency identification (RFID) tag based on a log-periodic (LP) dipole array is proposed, where the tailorable bandrejection property of the LP aperture is utilised to realise a large number of codes. The proposed tag principle is successfully validated by measurements, where the absence and presence of the band-rejection is shown to carry the bit information. Its fabrication simplicity is also demonstrated by its implementation on a flexible substrate. Finally, two different tag formation schemes, based on a specific set of resonance suppressions, are discussed in detail. © 2014 The Institution of Engineering and Technology.
An Event-Based Simulation Framework To Examine The Response Of Power Grid To The Charging Demand Of Plug-In Hybrid Electric Vehicles, Zahra Darabi, Mehdi Ferdowsi
An Event-Based Simulation Framework To Examine The Response Of Power Grid To The Charging Demand Of Plug-In Hybrid Electric Vehicles, Zahra Darabi, Mehdi Ferdowsi
Electrical and Computer Engineering Faculty Research & Creative Works
This paper describes the development of a discrete-event simulation framework that emulates the interactions between the power grid and plug-in hybrid electric vehicles (PHEVs) and examines whether the capacity of the existing power system can meet the PHEV load demand. The probability distribution functions for the arrival time and energy demand of each vehicle are extracted from real-world statistical transportation data. The power grid's limited generation and transmission capacities are considered to be the major constraints. Therefore, vehicles may have to wait to receive any charge. The proposed simulation framework is justified and described in some detail in applying it …
Magnetoelectric Dipole Antenna Arrays, Shulabh Gupta, Li (Lijun) Jun Jiang, Christophe Caloz
Magnetoelectric Dipole Antenna Arrays, Shulabh Gupta, Li (Lijun) Jun Jiang, Christophe Caloz
Electrical and Computer Engineering Faculty Research & Creative Works
A planar magnetoelectric (ME) dipole antenna array is proposed and demonstrated by both full-wave analysis and experiments. The proposed structure leverages the operation of composite right/left-handed transmission lines under balanced conditions to form high-gain magnetic radiators, combined with radial conventional electric radiators, where the overall structure is excited by a single differential feed. The traveling-wave-type nature of the proposed ME-dipole antenna enables the formation of directive arrays with high-gain characteristics and scanning capability. Peak gains of 10.84 dB and 5.73 dB are demonstrated for the electric dipole and magnetic-dipole radiation components, respectively. © 1963-2012 IEEE.
A New Efficient Method For Analysis Of Finite Periodic Structures, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha
A New Efficient Method For Analysis Of Finite Periodic Structures, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
The electromagnetic modeling of practical finite periodic structures is a topic of growing interest. Due to the truncation of the infinite periodic structures, surface waves will be excited and localized near the discontinuous interfaces leading to the edge effect of finite structures. In this work, surface waves are numerically disentangled from the propagating Bloch waves contributions. Based on the universally exponential decay feature of the surface waves, a novel method is developed by connecting the solution to the large finite periodic structure with that to a relatively small one resulting in low complexity and memory consumption. The method numerically reconstructs …
Hidden Markov Model With Information Criteria Clustering And Extreme Learning Machine Regression For Wind Forecasting, Dao Lam, Shuhui Li, Donald C. Wunsch
Hidden Markov Model With Information Criteria Clustering And Extreme Learning Machine Regression For Wind Forecasting, Dao Lam, Shuhui Li, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes a procedural pipeline for wind forecasting based on clustering and regression. First, the data are clustered into groups sharing similar dynamic properties. Then, data in the same cluster are used to train the neural network that predicts wind speed. For clustering, a hidden Markov model (HMM) and the modified Bayesian information criteria (BIC) are incorporated in a new method of clustering time series data. to forecast wind, a new method for wind time series data forecasting is developed based on the extreme learning machine (ELM). the clustering results improve the accuracy of the proposed method of wind …
Overexpression Of Dcf1 Inhibits Glioma Through Destruction Of Mitochondria And Activation Of Apoptosis Pathway, Yuqiong Xie, Qang Li, Qingbo Yang
Overexpression Of Dcf1 Inhibits Glioma Through Destruction Of Mitochondria And Activation Of Apoptosis Pathway, Yuqiong Xie, Qang Li, Qingbo Yang
Electrical and Computer Engineering Faculty Research & Creative Works
Gliomas are the most common brain tumors affecting the central nervous system and are associated with a high mortality rate. DCF1 is a membrane protein that was previously found to play a role in neural stem cell differentiation. In the present study, we found that overexpression of dcf1 significantly inhibited cell proliferation, migration, and invasion and dramatically promoted apoptosis in the glioblastoma U251 cell line. DCF1 deletion mutations in the functional region showed that the complete structure of DCF1 was necessary for apoptosis. Furthermore, significantly lower tumorigenicity was observed in athymic nude mice by transplanting U251 cells overexpressing dcf1. To …
A Hybrid Time-Domain Discontinuous Galerkin-Boundary Integral Method For Electromagnetic Scattering Analysis, Ping Li, Yifei Shi, Li (Lijun) Jun Jiang, Hakan Baǧci
A Hybrid Time-Domain Discontinuous Galerkin-Boundary Integral Method For Electromagnetic Scattering Analysis, Ping Li, Yifei Shi, Li (Lijun) Jun Jiang, Hakan Baǧci
Electrical and Computer Engineering Faculty Research & Creative Works
A scheme hybridizing discontinuous Galerkin time-domain (DGTD) and time-domain boundary integral (TDBI) methods for accurately analyzing transient electromagnetic scattering is proposed. Radiation condition is enforced using the numerical flux on the truncation boundary. The fields required by the flux are computed using the TDBI from equivalent currents introduced on a Huygens' surface enclosing the scatterer. The hybrid DGTDBI ensures that the radiation condition is mathematically exact and the resulting computation domain is as small as possible since the truncation boundary conforms to scatterer's shape and is located very close to its surface. Locally truncated domains can also be defined around …
A Calderón Preconditioner For The Electric Field Integral Equation With Layered Medium Green's Function, Yongpin P. Chen, Sheng Sun, Lijun Jiang, Weng Cho Chew
A Calderón Preconditioner For The Electric Field Integral Equation With Layered Medium Green's Function, Yongpin P. Chen, Sheng Sun, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
A Calderón preconditioner is developed for the analysis of electromagnetic scattering of perfect electrically conducting (PEC) objects embedded in a layered medium. The electric field integral equation (EFIE) is formulated with the kernel of layered medium Green's function to account for the effects from the multilayered background. The Calderón projector is derived based on the general source-field relationship and the extinction theorem for inhomogeneous environment in electromagnetic theory. The Calderón identities can be naturally deduced based on this projector, which is then leveraged to precondition the EFIE with layered kernel. An alternative implementation is then proposed to make the implementation …
A Rigorous Approach For The Radiated Emission Characterization Based On The Spherical Magnetic Field Scanning, Ping Li, Li (Lijun) Jun Jiang
A Rigorous Approach For The Radiated Emission Characterization Based On The Spherical Magnetic Field Scanning, Ping Li, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Electromagnetic radiated emissions from antennas, printed circuit boards (PCBs), and electronic devices are becoming increasingly critical to today's IC electromagnetic compatibility and interference properties. In this paper, a rigorous characterization approach is proposed. The electromagnetic field sampling over a spherical testing surface is applied to obtain the radiated magnetic field of the device under test (DUT) placed at the center of the sampling region. Using the dyadic Green's function (DGF) and Huygens' principle, the transformation from the sampled spherical tangential field to the far field is directly computed without resorting to the conventional inverse algorithm. The DGF considers the existence …
Helmholtz Decomposition Based On Integral Equation Method For Electromagnetic Analysis, Xiaoyan Y.Z. Xiong, Wei E.I. Sha, Li (Lijun) Jun Jiang
Helmholtz Decomposition Based On Integral Equation Method For Electromagnetic Analysis, Xiaoyan Y.Z. Xiong, Wei E.I. Sha, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Helmholtz decomposition (HD) is a vector analysis fundamental tool and plays an important role in electromagnetics (EM) and microwave engineering. Instead of applying HD to the EM solving process, this article proposes an integral equation based rigorous HD process to extract and analyze the known EM field. It provides much clearer insight into field coupling and radiation mechanism that is valuable to electromagnetic interference (EMI) and electromagnetic compatibility (EMC) analysis. Compared to the loop-tree based decomposition that is a quasi-HD, the proposed method is rigorous and frequency-independent. The algorithm verification and its application to coupling and resonating problems are presented. …
Unveiling Magnetic Dipole Radiation In Phase-Reversal Leaky-Wave Antennas, Shulabh Gupta, Li (Lijun) Jun Jiang, Christophe Caloz
Unveiling Magnetic Dipole Radiation In Phase-Reversal Leaky-Wave Antennas, Shulabh Gupta, Li (Lijun) Jun Jiang, Christophe Caloz
Electrical and Computer Engineering Faculty Research & Creative Works
The radiation principle of traveling-wave-type phase-reversal antennas is explained in detail, unveiling the presence of magnetic-dipole radiation in addition to well-known electric dipole radiation. It is pointed out that such magnetic-dipole radiation is specific to the case of traveling-wave phase-reversal antennas, whereas only electric-dipole radiation exists in resonant-type phase-reversal antennas. It is shown that a phase-reversal traveling-wave antenna alternately operates as an array of magnetic dipoles and an array of electric dipoles during a time-harmonic period. This radiation mechanism is confirmed through both full-wave and experimental results. © 2014 IEEE.
Generalized Modal Expansion And Reduced Modal Representation Of 3-D Electromagnetic Fields, Qi I. Dai, Yat Hei Lo, Weng Cho Chew, Yang G. Liu, Li (Lijun) Jun Jiang
Generalized Modal Expansion And Reduced Modal Representation Of 3-D Electromagnetic Fields, Qi I. Dai, Yat Hei Lo, Weng Cho Chew, Yang G. Liu, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A generalized modal expansion theory for investigating arbitrary 3-D bounded and unbounded electromagnetic fields is presented. When an inhomogeneity is enclosed with impenetrable boundaries, the field excited by arbitrary sources is expanded with a complete set of eigenmodes, which are classified into trapped modes and radiation modes. As the boundaries tend to infinity, trapped modes remain unchanged, while radiation modes form a continuum. To illustrate the theory, several real-life structures are investigated with a conformal finite-difference technique in the frequency domain. Perfectly matched layers (PMLs) are imposed at finite extent to emulate the unbounded problems. Numerical examples show that, only …
Electromagnetic Cell With Three-Dimensional Polarization Dynamic Control, Bo O. Zhu, Weng Cho Chew, Lijun Jiang
Electromagnetic Cell With Three-Dimensional Polarization Dynamic Control, Bo O. Zhu, Weng Cho Chew, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
An electromagnetic (EM) cell is demonstrated to create the uniform electric field with 3-D polarization dynamic control for the EM compatibility/ interference (EMC/EMI) testing. We utilize 3-D orthogonal slotline structures to build the walls of the EM cell and produce uniform electric field inside the cell by feeding the slotlines in phase and terminating them with matching loads. The uniform electric field is similar to a standing wave produced by the slotline modes propagating in opposite directions. Microwave switches are integrated into the slotlines so that we can choose the operating slotline dynamically and change its orientation in a 3-D …
Casimir Force For Complex Objects Using Domain Decomposition Techniques, Phillip R. Atkins, Weng Cho Chew, Mao Kun Li, Lin E. Sun, Zu Hui Ma, Li (Lijun) Jun Jiang
Casimir Force For Complex Objects Using Domain Decomposition Techniques, Phillip R. Atkins, Weng Cho Chew, Mao Kun Li, Lin E. Sun, Zu Hui Ma, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A method for calculating the Casimir force between large, complex 3D objects is presented. Difficulties have previously arisen in broadband multiscale calculation using CEM methods. To expand the range of problems that can be calculated, we use an integral equation, domain decomposition method (DDM) and argument principle to derive the Casimir force formula. The broadband integral equation DDM, which is the augmented equivalence principle algorithm (A-EPA), allows for an efficient broadband solution of large, complex objects. A-EPA subdivides a complex problem into separate smaller subproblems that are later recombined into a reduced matrix. This yields a reduced number of unknowns …
Traveling-Wave Antennas With Exotic Radiation Patterns, S. Gupta, C. Caloz, L. (Lijun) J. Jiang
Traveling-Wave Antennas With Exotic Radiation Patterns, S. Gupta, C. Caloz, L. (Lijun) J. Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Two type of planar leaky-wave antennas are presented which are capable of providing combined electric and magnetic-dipole radiation responses from a single electromagnetic structure, leading to exotic radiation pattern characteristics. Their principle and radiation characteristics are discussed in details.
Overhead High-Voltage Transmission-Line Current Monitoring By Magnetoresistive Sensors And Current Source Reconstruction At Transmission Tower, X. Sun, Q. Huang, L. (Lijun) J. Jiang, P. W.T. Pong
Overhead High-Voltage Transmission-Line Current Monitoring By Magnetoresistive Sensors And Current Source Reconstruction At Transmission Tower, X. Sun, Q. Huang, L. (Lijun) J. Jiang, P. W.T. Pong
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes a novel current monitoring technology based on magnetic field sensing at a transmission tower for overhead high-voltage transmission lines (HVTLs), which can accurately measure phase current parameters in real time. This technology is based on the phenomenon that the magnetic field distribution at the top level of a transmission tower can reflect the operation states of the transmission lines including current amplitude and phase angle imbalances. A current source reconstruction method based on stochastic optimization strategy was developed to reconstruct the electrical parameters from the magnetic field emanated by the overhead transmission lines. This concept of current …
Hybrid-Cascade Coupled-Line Phasers For High-Resolution Radio-Analog Signal Processing, Thomas Paradis, Shulabh Gupta, Qingfeng Zhang, Li (Lijun) J. Jiang, Christophe Caloz
Hybrid-Cascade Coupled-Line Phasers For High-Resolution Radio-Analog Signal Processing, Thomas Paradis, Shulabh Gupta, Qingfeng Zhang, Li (Lijun) J. Jiang, Christophe Caloz
Electrical and Computer Engineering Faculty Research & Creative Works
A hybrid-cascade (HC) coupled-line phaser configuration is presented to synthesize enhanced group delay responses for high-resolution radio-analog signal processing. Using exact analytical transfer functions, the superiority of HC coupled-line phasers over conventional transversally cascaded C-section phasers is demonstrated and verified using full-wave simulations. © 2014 Wiley Periodicals, Inc.
Network Resilience Improvement Using Link Additions, Mohammed J. F. Alenazi, Egemen K. Çetinkaya, James P. G. Sterbenz
Network Resilience Improvement Using Link Additions, Mohammed J. F. Alenazi, Egemen K. Çetinkaya, James P. G. Sterbenz
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
Microcavity Strain Sensor For High Temperature Applications, Amardeep Kaur, Steve Eugene Watkins, Jie Huang, Lei Yuan, Hai Xiao
Microcavity Strain Sensor For High Temperature Applications, Amardeep Kaur, Steve Eugene Watkins, Jie Huang, Lei Yuan, Hai Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
A microcavity extrinsic Fabry-Perot interferometric (EFPI) fiber-optic sensor is presented for measurement of strain. The EFPI sensor is fabricated by micromachining a cavity on the tip of a standard single-mode fiber with a femtosecond (fs) laser and is then self-enclosed by fusion splicing another piece of single-mode fiber. The fs-laser-based fabrication makes the sensor thermally stable to sustain temperatures as high as 800°C. The sensor exhibits linear performance for a range up to 3700 µε and a low temperature sensitivity of only 0.59 pm/°C through 800°C.
A Static Voltage Security Region For Centralized Wind Power Integration-Part Ii: Applications, Tao Ding, Qinglai Guo, Rui Bo, Hongbin Sun, Boming Zhang, Tianen Huang
A Static Voltage Security Region For Centralized Wind Power Integration-Part Ii: Applications, Tao Ding, Qinglai Guo, Rui Bo, Hongbin Sun, Boming Zhang, Tianen Huang
Electrical and Computer Engineering Faculty Research & Creative Works
In Part I of this work, a static voltage security region was introduced to guarantee the safety of wind farm reactive power outputs under both base conditions and N-1 contingency. In this paper, a mathematical representation of the approximate N-1 security region has further studied to provide better coordination among wind farms and help prevent cascading tripping following a single wind farm trip. Besides, the influence of active power on the security region is studied. The proposed methods are demonstrated for N-1 contingency cases in a nine-bus system. The simulations verify that the N-1 security region is a small subset …
Data Pattern Based Electromagnetic Interference Modeling For Ic Packaging, Nick K.H. Huang, Tao Wang, Li (Lijun) Jun Jiang, X. Y. Xiong
Data Pattern Based Electromagnetic Interference Modeling For Ic Packaging, Nick K.H. Huang, Tao Wang, Li (Lijun) Jun Jiang, X. Y. Xiong
Electrical and Computer Engineering Faculty Research & Creative Works
Electromagnetic interference (EMI) is becoming more serious when the data rate of the digital system continues increasing. However, its modeling and analysis are very challenging. In this paper, a novel electromagnetic superposition method is developed to model the IC packaging electromagnetic emission. It employs the equivalence principle to obtain the electromagnetic field response over a broad spectrum. Then it uses the linear property of the passive parasitic system to superpose the contribution of different signals on the packaging. As a result, with certain pre-calculations, it is convenient to compute the electromagnetic emission efficiently from different signals with various data pattern …
Blackbox Macro-Modeling Of The Nonlinearity Based On Volterra Series Representation Of X-Parameters, Xiaoyan Y.Z. Xiong, Li (Lijun) J. Jiang, José E. Schutt-Ainé, Weng Cho Chew
Blackbox Macro-Modeling Of The Nonlinearity Based On Volterra Series Representation Of X-Parameters, Xiaoyan Y.Z. Xiong, Li (Lijun) J. Jiang, José E. Schutt-Ainé, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
Volterra series representation is a powerful mathematical model for nonlinear devices. However, the difficulties in determining higher-order Volterra kernels limited its broader applications. This paper proposed a systematic approach that enables a convenient extraction of Volterra kernels from X-parameters for the first time. Then the Vandermonde method is employed to separate different orders of Volterra kernels at the same frequency, which leads to a highly efficient extraction process. The proposed Volterra series representation based on X-parameters is further benchmarked for verification. The proposed new algorithm is very useful for the blackbox macro-modeling of nonlinear devices and systems.
Cosimulation Of Electromagnetics-Circuit Systems Exploiting Dgtd And Mna, Ping Li, Li (Lijun) Jun Jiang, Hakan Bagci
Cosimulation Of Electromagnetics-Circuit Systems Exploiting Dgtd And Mna, Ping Li, Li (Lijun) Jun Jiang, Hakan Bagci
Electrical and Computer Engineering Faculty Research & Creative Works
A hybrid electromagnetics (EM)-circuit simulator exploiting the discontinuous Galerkin time domain (DGTD) method and the modified nodal analysis (MNA) algorithm is developed for analyzing hybrid distributive and nonlinear multiport lumped circuit systems. The computational domain is split into two subsystems. One is the EM subsystem that is analyzed by DGTD, while the other is the circuit subsystem that is solved by the MNA method. The coupling between the EM and circuit subsystems is enforced at the lumped port where related field and circuit unknowns are coupled via the use of numerical flux, port voltages, and current sources. Since the spatial …
Model Order Reduction For Quantum Transport Simulation Of Band-To-Band Tunneling Devices, Jun Z. Huang, Lining Zhang, Weng Cho Chew, Chi Yung Yam, Li (Lijun) Jun Jiang, Guan Hua Chen, Mansun Chan
Model Order Reduction For Quantum Transport Simulation Of Band-To-Band Tunneling Devices, Jun Z. Huang, Lining Zhang, Weng Cho Chew, Chi Yung Yam, Li (Lijun) Jun Jiang, Guan Hua Chen, Mansun Chan
Electrical and Computer Engineering Faculty Research & Creative Works
Simulations of nanoelectronic devices with nonequilibrium Greens function are computationally very intensive, in particular, when combined with multiband approaches, such as the k p methods. To reduce the cost and make the simulation of realistic devices tractable, we have developed a model order reduction method for the simulation of hole transport in silicon nanowires using three- and six-band k p models. It is shown in this paper that, with a spurious band elimination process, the method can be readily extended to the eight-band case that enables us to simulate band-to-band tunneling devices. The method is demonstrated via constructing reduced models …
Adaptive Resonance Theory And Diffusion Maps For Clustering Applications In Pattern Analysis, Donald C. Wunsch, David J. Morris, Rui Xu
Adaptive Resonance Theory And Diffusion Maps For Clustering Applications In Pattern Analysis, Donald C. Wunsch, David J. Morris, Rui Xu
Electrical and Computer Engineering Faculty Research & Creative Works
Adaptive Resonance is primarily a theory that learning is regulated by resonance phenomena in neural circuits. Diffusion maps are a class of kernel methods on edge-weighted graphs. While either of these approaches have demonstrated success in image analysis, their combination is particularly effective. These techniques are reviewed and some example applications are given.
A Static Voltage Security Region For Centralized Wind Power Integration-Part I: Concept And Method, Tao Ding, Qinglai Guo, Rui Bo, Hongbin Sun, Boming Zhang
A Static Voltage Security Region For Centralized Wind Power Integration-Part I: Concept And Method, Tao Ding, Qinglai Guo, Rui Bo, Hongbin Sun, Boming Zhang
Electrical and Computer Engineering Faculty Research & Creative Works
When large wind farms are centrally integrated in a power grid, cascading tripping faults induced by voltage issues are becoming a great challenge. This paper therefore proposes a concept of static voltage security region to guarantee that the voltage will remain within operation limits under both base conditions and N-1 contingencies. For large wind farms, significant computational effort is required to calculate the exact boundary of the proposed security region. To reduce this computational burden and facilitate the overall analysis, the characteristics of the security region are first analyzed, and its boundary components are shown to be strictly convex. Approximate …