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Electrical and Computer Engineering Faculty Research & Creative Works

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Articles 1321 - 1350 of 3518

Full-Text Articles in Engineering

Adjust Decision-Making Targets Based On Psychological Thresholds, Jian Liu, Shun Xiang Wu, Si Feng Liu, Qiao Wang Dec 2013

Adjust Decision-Making Targets Based On Psychological Thresholds, Jian Liu, Shun Xiang Wu, Si Feng Liu, Qiao Wang

Electrical and Computer Engineering Faculty Research & Creative Works

This paper study the impact of psychological thresholds (PTs) on the decision maker's (DM's) decision target when making decision. A new approach of decision making is proposed in this paper. First, we construct criterion expected functions according to three different types of criteria: profit type, cost-type and intermediate-type, respectively. Then, we calculate the local degree of satisfaction (LDS) of each object when PTs exists, in order to adjust the initial decision target to make up new decision table. Later, by weighting the criteria reaching the DM's degree of satisfaction (DS) along with information aggregation algorithm, we obtain the overall satisfaction …

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Distributed Generation And Storage Optimal Control With State Estimation, F. Meng, D. Haughton, B. Chowdhury, Mariesa Crow, G. T. Heydt Dec 2013

Distributed Generation And Storage Optimal Control With State Estimation, F. Meng, D. Haughton, B. Chowdhury, Mariesa Crow, G. T. Heydt

Electrical and Computer Engineering Faculty Research & Creative Works

The increasing demand coupled with expanding installation of distributed resources call for the development of smart technologies to control and optimize distribution system operations. In this paper, a distributed generation and storage optimization algorithm is proposed using pricing signals as distribution locational marginal pricing (DLMP). This signal is used to optimize the day-ahead operation planning of distributed generation and energy storage. A distribution level state estimation algorithm is also designed. The main conclusion is that the proposed optimal control and state estimation will improve the energy efficiency and economic benefits in a digitally controlled distribution power system. © 2013 IEEE.

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Capacitance Calculation For Via Structures Using An Integral Equation Method Based On Partial Capacitance, Hanfeng Wang, Siming Pan, Jingook Kim, Albert E. Ruehli, Jun Fan Dec 2013

Capacitance Calculation For Via Structures Using An Integral Equation Method Based On Partial Capacitance, Hanfeng Wang, Siming Pan, Jingook Kim, Albert E. Ruehli, Jun Fan

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a new integral equation formulation for via structures is developed for the capacitance extraction between vias and planes. The formulation is initially developed for axially symmetric geometries and then extended to axially asymmetric geometries by changing the circular ring cells to arc cells. The extended method can be used to calculate the shared-antipad via structure, which is widely used in high-speed differential signal interconnects. In addition, the image theory is used to handle inhomogeneous media, and a new technique is given to reduce computational costs for via-to-plane structures based on properties of the capacitance-matrix elements. The proposed …

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Study Of Low-Rate Ook And Bpsk Transmission With Pn Sequence In Shallow Water Acoustic Communication, Jinxing Hao, Jintao Wang, Yahong Rosa Zheng Dec 2013

Study Of Low-Rate Ook And Bpsk Transmission With Pn Sequence In Shallow Water Acoustic Communication, Jinxing Hao, Jintao Wang, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

This work shows some results of synchronization and channel estimation in simple underwater acoustic communication systems using On-off keying and binary phase-shift keying.

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Novel Crack Sensor For Tsv-Based 3d Integrated Circuits: Design And Deployment Perspectives, Chun Zhang, Moongon Jung, Sung Kyu Lim, Yiyu Shi Dec 2013

Novel Crack Sensor For Tsv-Based 3d Integrated Circuits: Design And Deployment Perspectives, Chun Zhang, Moongon Jung, Sung Kyu Lim, Yiyu Shi

Electrical and Computer Engineering Faculty Research & Creative Works

The CTE mismatch-induced stress in 3D ICs may initiate cracks from the interface between a TSV and its dielectric liner and propagates them on the silicon substrate surface. If a crack grows beyond the keep-out-zone (KOZ) of a TSV, it will jeopardize the reliability of the devices along its propagation path. While such threat can be eliminated by a sufficiently large KOZ, significant area overhead will be incurred. Given the low probability of crack occurrence, we argue that a much more economical approach is to keep KOZ small and filter out bad chips with cracks growing beyond the KOZ during …

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Study Of Cross Polarization Of Tapered Slot Antenna For Emc Measurements, Fenghan Lin, Jun Fan, Yihong Qi, Yongchang Jiao Dec 2013

Study Of Cross Polarization Of Tapered Slot Antenna For Emc Measurements, Fenghan Lin, Jun Fan, Yihong Qi, Yongchang Jiao

Electrical and Computer Engineering Faculty Research & Creative Works

Development of wireless technologies pushes for more accurate and more consistent EMC measurements. Antenna cross polarization is found to be a main contributor to the measurement errors. In this paper, full-wave analysis of E-field distribution of various slot lines is presented, which reveals that the bilateral tapered slot antenna has the widest impedance bandwidth and the lowest cross-polarization level simultaneously. The conclusions obtained in this paper will be used to develop an innovative wideband (from 700 MHz to 20 GHz) bilateral tapered slot antenna used for wireless EMC testing. © 2013 IEEE.

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Eagle-Eye: A Near-Optimal Statistical Framework For Noise Sensor Placement, Tao Wang, Chun Zhang, Jinjun Xiong, Yiyu Shi Dec 2013

Eagle-Eye: A Near-Optimal Statistical Framework For Noise Sensor Placement, Tao Wang, Chun Zhang, Jinjun Xiong, Yiyu Shi

Electrical and Computer Engineering Faculty Research & Creative Works

The relentless technology scaling has led to significantly reduced noise margin and complicated functionalities. As such, design time techniques per se are less likely to ensure power integrity, resulting in runtime voltage emergencies. To alleviate the issue, recently several works have shed light on the possibilities of dynamic noise management systems. Most of these works rely on on-chip noise sensors to accurately capture voltage emergencies. However, they all assume, either implicitly or explicitly, that the placement of the sensors is given. It remains an open problem in the literature how to optimally place a given number of noise sensors for …

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Two-Stage List Sphere Decoding For Under-Determined Multiple-Input Multiple-Output Systems, Chen Qian, Jingxian Wu, Yahong Rosa Zheng, Zhaocheng Wang Dec 2013

Two-Stage List Sphere Decoding For Under-Determined Multiple-Input Multiple-Output Systems, Chen Qian, Jingxian Wu, Yahong Rosa Zheng, Zhaocheng Wang

Electrical and Computer Engineering Faculty Research & Creative Works

A two-stage list sphere decoding (LSD) algorithm is proposed for under-determined multiple-input multiple-output (UD-MIMO) systems that employ N transmit antennas and Msystem; while Group 2 contains layers M+1 to N that contribute to the rank deficiency of the channel Gram matrix. Tree search algorithms are used for both groups, but with different search radii. A new method is proposed to adaptively adjust the tree search radius of Group 2 based on the statistical properties of the received signals. The employment of the adaptive tree search can significantly reduce the computation complexity. We also propose a modified channel Gram matrix to …

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Zero-Sum Two-Player Game Theoretic Formulation Of Affine Nonlinear Discrete-Time Systems Using Neural Networks, Shahab Mehraeen, Travis Dierks, S. Jagannathan, Mariesa L. Crow Dec 2013

Zero-Sum Two-Player Game Theoretic Formulation Of Affine Nonlinear Discrete-Time Systems Using Neural Networks, Shahab Mehraeen, Travis Dierks, S. Jagannathan, Mariesa L. Crow

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, the nearly optimal solution for discrete-time (DT) affine nonlinear control systems in the presence of partially unknown internal system dynamics and disturbances is considered. The approach is based on successive approximate solution of the Hamilton-Jacobi-Isaacs (HJI) equation, which appears in optimal control. Successive approximation approach for updating control and disturbance inputs for DT nonlinear affine systems are proposed. Moreover, sufficient conditions for the convergence of the approximate HJI solution to the saddle point are derived, and an iterative approach to approximate the HJI equation using a neural network (NN) is presented. Then, the requirement of full knowledge …

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An Enhanced Mixed-Form Fast Multipole Algorithm Using Rotation Methods, Ling Ling Meng, Li (Lijun) Jun Jiang Dec 2013

An Enhanced Mixed-Form Fast Multipole Algorithm Using Rotation Methods, Ling Ling Meng, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, the broadband accuracy of the mixed-form fast multipole algorithm (MF-FMA) is improved by applying rotation techniques. Two kinds of rotation methods are employed respectively. One is the coordinate system rotation technique. The other one is the pseudospectral projection based on fast Fourier transform (FFT). Either of them has certain advantages depending on the number of multipoles. Through rotation, translation matrices become very sparse, which enables us to save the storage as well as the CPU time. Hence, we can increase the number of multipoles in the low frequency regime to shift up the transition region of MF-FMA. …

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Three Dimensional Polarization Controllable Electromagnetic Cell, Bo Zhu, Weng Cho Chew, Lijun Jiang Dec 2013

Three Dimensional Polarization Controllable Electromagnetic Cell, Bo Zhu, Weng Cho Chew, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

We demonstrate an electromagnetic (EM) cell that can generate uniform electric field with three dimensional (3D) polarization dynamic control for the EM compatibility/interference (EMC/EMI) testing. 3D orthogonal slotline structures are designed and utilized to build the walls of the EM cell. By feeding the slotlines in phase and terminating them with matching loads, the uniform electric field similar to a standing wave is produced by two slotline modes propagating in opposite directions inside the cell. Microwave switches are integrated into the slotlines so that we can choose the operating slotline dynamically and change its orientation in a 3D manner by …

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Co-Simulation Of Distributive And Lumped Systems Using The Discontinuous Galerkin Time Domain Finite Element Method, Ping Li, Li (Lijun) Jun Jiang Dec 2013

Co-Simulation Of Distributive And Lumped Systems Using The Discontinuous Galerkin Time Domain Finite Element Method, Ping Li, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

The signal integrity and power integrity analysis of 3D integrated circuits or other EMC/EMI systems usually separate the lumped circuit modeling and the distributive system modeling. However, due to the high density of integration, it is not proper to separate them in the modeling process anymore. In this paper, a hybrid electromagnetics (EM)-circuit simulator is proposed for incorporating multiport lumped circuit networks through their admittance matrices into the discontinuous Galerkin time-domain finite element method (DGTDFEM). The admittance matrix in the Laplace-domain can be derived analytically or obtained from network parameters such as S-parameters in the frequency domain. To convert frequency …

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Enhanced A-Efie With Calderón Multiplicative Preconditioner, Sheng Sun, Lijun Jiang, Weng Cho Chew Dec 2013

Enhanced A-Efie With Calderón Multiplicative Preconditioner, Sheng Sun, Lijun Jiang, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

In this work, a Calderón multiplicative preconditioner (CMP) is proposed for the augmented electric field integral equation (A-EFIE) to improve the convergence. To avoid the imbalance between the vector potential and the scalar potential in the traditional EFIE, A-EFIE considers both the charge and the current as unknowns. After implementing the appropriate frequency scaling and the enforcement of charge neutrality, its formulation is also stable in the low-frequency regime and applicable for large-scale and complex problems. Instead of using other preconditioners, Calderón preconditioning converts the first kind integral equations into the second kind, thus improving the spectrum of the original …

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Analysis Of The Permeability Spectra Of Spinel Ferrite Composites Using Mixing Rules, Takanori Tsutaoka, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva Dec 2013

Analysis Of The Permeability Spectra Of Spinel Ferrite Composites Using Mixing Rules, Takanori Tsutaoka, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva

Electrical and Computer Engineering Faculty Research & Creative Works

Magnetic permeability spectra of composite materials containing spinel ferrites (Ni-Zn or Mn-Zn types) have been studied using a permeability dispersion formula by the numerical analysis. The variation of d.c. permeability and the frequency dispersion parameters due to domain wall and gyromagnetic spin resonances with particle content were evaluated using two mixing rules, Coherent Model Approximation (CMA) and Maxwell-Garnet Approximation (MGA) assuming the isotropic particle shape. The variation of d.c. permeability with particle content for spinel ferrite composite can be predicted by the CMA and MGA using the permeability value of embedded ferrite. The dc susceptibility and resonance frequency of domain …

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Optimization Of The Transition From Connector To Pcb Board, Shuai Jin, Jiangfan Zhang, Jun Fan Dec 2013

Optimization Of The Transition From Connector To Pcb Board, Shuai Jin, Jiangfan Zhang, Jun Fan

Electrical and Computer Engineering Faculty Research & Creative Works

A transition from vertically launched coaxial connector to routed trace on board is simulated and optimized to achieve very small reflections for precise TRL calibration. The mismatch of the discontinuities in the transition was reduced by controlling the via-impedance, introducing capacitive via-pads and applying diving boards. Each segment was optimized first, and then the whole cascaded structure was simulated to achieve the optimized smooth signal transition. © 2013 IEEE.

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Solutions To Finite Horizon Cost Problems Using Actor-Critic Reinforcement Learning, Ivo Grondman, Hao Xu, Sarangapani Jagannathan, Robert Babuska Dec 2013

Solutions To Finite Horizon Cost Problems Using Actor-Critic Reinforcement Learning, Ivo Grondman, Hao Xu, Sarangapani Jagannathan, Robert Babuska

Electrical and Computer Engineering Faculty Research & Creative Works

Actor-critic reinforcement learning algorithms have shown to be a successful tool in learning the optimal control for a range of (repetitive) tasks on systems with (partially) unknown dynamics, which may or may not be nonlinear. Most of the reinforcement learning literature published up to this point only deals with modeling the task at hand as a Markov decision process with an infinite horizon cost function. In practice, however, it is sometimes desired to have a solution for the case where the cost function is defined over a finite horizon, which means that the optimal control problem will be time-varying and …

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Modeling Of Crosstalk Between Two Nonparallel Striplines On Adjacent Layers, Songping Wu, Jun Fan Dec 2013

Modeling Of Crosstalk Between Two Nonparallel Striplines On Adjacent Layers, Songping Wu, Jun Fan

Electrical and Computer Engineering Faculty Research & Creative Works

Crosstalk between two nonparallel strip lines on adjacent layers is investigated. An equivalent per unit length model for nonparallel lines is developed based on multiconductor transmission line theories and the Nelder-Mead optimization algorithm. The physical meaning of the equivalent model is explained for different test geometries. Empirical formulas, as functions of various geometric parameters, are derived based on multivariable curve fitting for a set of defined trace geometries. The validity of the empirical model is confirmed through comparison with different test examples. © 2013 IEEE.

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A Coaxial Cable Fabry-Perot Interferometer For Sensing Applications, Jie Huang, Tao Wang, Lei Hua, Jun Fan, Hai Xiao, Ming Luo Nov 2013

A Coaxial Cable Fabry-Perot Interferometer For Sensing Applications, Jie Huang, Tao Wang, Lei Hua, Jun Fan, Hai Xiao, Ming Luo

Electrical and Computer Engineering Faculty Research & Creative Works

This paper reports a novel coaxial cable Fabry-Perot interferometer for sensing applications. The sensor is fabricated by drilling two holes half-way into a coaxial cable. The device physics was described. The temperature and strain responses of the sensor were tested. The measurement error was calculated and analyzed.

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Simulation Of Electromagnetic Waves In The Magnetized Cold Plasma By A Dgfetd Method, Ping Li, Li (Lijun) Jun Jiang Oct 2013

Simulation Of Electromagnetic Waves In The Magnetized Cold Plasma By A Dgfetd Method, Ping Li, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

The properties of electromagnetic waves propagating in magnetized plasma slabs and scattering from plasma coated spheres are investigated using the discontinuous Galerkin finite-element time-domain (DGFETD) method. The magnetized plasma is a kind of gyroelectric anisotropic dispersive medium. This anisotropy must be described by an electric permittivity tensor with both nonzero diagonal and off-diagonal elements. Instead of doing the convolution directly in the time domain, an auxiliary differential equations (ADE) method is employed to represent the constitutive relation. The algorithm is validated by studying the transmission characteristics via electron-composed plasma slabs and radar cross section (RCS) of plasma-coated spheres. All numerical …

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Operation-State Monitoring And Energization-Status Identification For Underground Power Cables By Magnetic Field Sensing, Xu Sun, Chun Kit Poon, Geoffrey Chan, Cher Leung Sum, Wing Kin Lee, Lijun Jiang, Philip W.T. Pong Oct 2013

Operation-State Monitoring And Energization-Status Identification For Underground Power Cables By Magnetic Field Sensing, Xu Sun, Chun Kit Poon, Geoffrey Chan, Cher Leung Sum, Wing Kin Lee, Lijun Jiang, Philip W.T. Pong

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a novel nondestructive method based on magnetic field sensing is proposed for underground power cable operation-state monitoring and energization-status identification. The magnetic field distribution of the cable is studied using finite element method (FEM) for the power cable operating in different states, i.e., current-energized state (the cable is energized and carries load current) and voltage-energized state (the cable is energized but carries no load current). This innovative method can reconstruct all the source parameters of the cable based on a set of measured magnetic field values. Stochastic optimization technique is applied to realize the reconstruction based on …

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Nonlinear Acoustic Echo Cancellation Using Feedback, Pratik Shah, Ian Lewis, Steven Grant, Sylvain Angrignon Oct 2013

Nonlinear Acoustic Echo Cancellation Using Feedback, Pratik Shah, Ian Lewis, Steven Grant, Sylvain Angrignon

Electrical and Computer Engineering Faculty Research & Creative Works

Acoustic echo cancellation (AEC) is a well-studied problem. One of the main assumptions in existing AEC techniques is that the echo path is linear. In today's equipment, this assumption does always hold. The increasing focus on the look and feel of commercial devices and consequently the decreasing size of their loudspeakers are the major contributors to making the echo path nonlinear. This emphasizes the need for a nonlinear echo canceler to maintain the required echo return loss enhancement (ERLE). Many algorithms have been proposed to solve this problem, but they are prohibitive because of their high computational complexity. This paper …

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Stochastic Optimal Controller Design For Uncertain Nonlinear Networked Control System Via Neuro Dynamic Programming, Hao Xu, Sarangapani Jagannathan Oct 2013

Stochastic Optimal Controller Design For Uncertain Nonlinear Networked Control System Via Neuro Dynamic Programming, Hao Xu, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

The stochastic optimal controller design for the nonlinear networked control system (NNCS) with uncertain system dynamics is a challenging problem due to the presence of both system nonlinearities and communication network imperfections, such as random delays and packet losses, which are not unknown a priori. In the recent literature, neuro dynamic programming (NDP) techniques, based on value and policy iterations, have been widely reported to solve the optimal control of general affine nonlinear systems. However, for real-time control, value and policy iterations-based methodology are not suitable and time-based NDP techniques are preferred. In addition, output feedback-based controller designs are preferred …

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Loop-Tree Free Augmented Equivalence Principle Algorithm For Low-Frequency Problems, Zu Hui Ma, Li (Lijun) Jun Jiang, Weng Cho Chew Oct 2013

Loop-Tree Free Augmented Equivalence Principle Algorithm For Low-Frequency Problems, Zu Hui Ma, Li (Lijun) Jun Jiang, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

In this article, we describe a newly developed integral equation domain decomposition method for solving complex low frequency electromagnetic problems. This method is based on low frequency augmented equivalence principle algorithm (EPA) with the augmented electric field integral equation (A-EFIE). The A-EFIE provides a stable solution in the low-frequency regime as it includes both charge and current as unknowns to avoid the imbalance between the vector potential and the scalar potential. Based on similar idea, the augmented EPA can suppress the projection error resulting from low-frequency problems of the normal EPA. Combining these two methods, the proposed algorithm can be …

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Quantum Computing Circuits, Cheng-Hsiao Wu, Casey Andrew Cain Sep 2013

Quantum Computing Circuits, Cheng-Hsiao Wu, Casey Andrew Cain

Electrical and Computer Engineering Faculty Research & Creative Works

A system for performing digital operations, including a first device configured to transform a digital input into one or more signals, at least one AB ring, the at least one AB ring irreducibly-coupled and configured to include at least three terminals, a second device configured to read a portion of a signal expressed upon two or more of the at least three terminals, and a third device configured to transform the portion of the signal expressed upon two or more of the at least three terminals into a digital output, the third device operationally connected to the second device.

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Computational Modeling And Experimental Study On Optical Microresonators Using Optimal Spherical Structure For Chemical Sensing, Hanzheng Wang, Lei Yuan, Jie Huang, Xinwei Lan, Cheol-Woon Kim, Lan Jiang, Hai Xiao Sep 2013

Computational Modeling And Experimental Study On Optical Microresonators Using Optimal Spherical Structure For Chemical Sensing, Hanzheng Wang, Lei Yuan, Jie Huang, Xinwei Lan, Cheol-Woon Kim, Lan Jiang, Hai Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

Chemical sensors based on optical microresonators have been demonstrated highly sensitive by monitoring the refractive index (RI) changes in the surrounding area near the resonator surface. In an optical resonator, the Whispering Gallery Modes (WGMs) with high quality (Q) factor supported by the spherical symmetric structure interacts with the contiguous background through evanescent field. Highly sensitive detection can be realized because of the long lifetime of the photons. The computational models of solid glass microspheres and hollow glass spheres with porous wall (PW-HGM) were established. These two types of microresonators were studied through simulations. The PWHGM resonator was proved as …

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High Memory Passive Rfid Tags With Multimodal Sensor Design And Application To Asset Monitoring In-Transit, Haifeng Niu, S. Jagannathan Aug 2013

High Memory Passive Rfid Tags With Multimodal Sensor Design And Application To Asset Monitoring In-Transit, Haifeng Niu, S. Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, new passive Radio Frequency Identification (RFID) tags with multimodal sensors and a high on-tag memory is proposed. First, the features preferred on the new passive RFID tags are motivated followed by a detailed description on the design and fabrication of the tags. Next, the performance of the tags in terms of read range is evaluated. The experiments results show that proposed tags have a range of 5.8 meters when all sensors are disabled while the range reduces when sensors are enabled. However, it is demonstrated that the range can be enhanced to 8 meters by using energy …

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Compressed Sensing For Sar-Based Wideband Three-Dimensional Microwave Imaging System Using Non-Uniform Fast Fourier Transform, Hamed Kajbaf, Joseph T. Case, Zengli Yang, Yahong Rosa Zheng Aug 2013

Compressed Sensing For Sar-Based Wideband Three-Dimensional Microwave Imaging System Using Non-Uniform Fast Fourier Transform, Hamed Kajbaf, Joseph T. Case, Zengli Yang, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

A new compressed sensing (CS) image reconstruction method is proposed for high-resolution wideband three-dimensional synthetic aperture radar (SAR) imaging systems. In contrast to existing CS SAR methods that employ only a forward SAR transform in pre- or post-processing, the proposed method employs both forward SAR and reverse SAR (R-SAR) transforms in each CS iteration to improve the quality of reconstructed images. This study proposes a simple and elegant truncation repair method to combat the truncation error and utilizes non-uniform fast Fourier transform to reduce the SAR and R-SAR transform errors, thereby ensuring the convergence of the CS algorithm and improving …

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Fast And Accurate Multiscale Electromagnetic Modeling Framework: An Overview, W. C. Chew, A. C. Cangellaris, J. Schutt-Aine, H. Braunisch, Z. G. Qian, A. A. Aydiner, K. Aygun, L. (Lijun) J. Jiang, Z. H. Ma, L. L. Meng, M. Naeem Aug 2013

Fast And Accurate Multiscale Electromagnetic Modeling Framework: An Overview, W. C. Chew, A. C. Cangellaris, J. Schutt-Aine, H. Braunisch, Z. G. Qian, A. A. Aydiner, K. Aygun, L. (Lijun) J. Jiang, Z. H. Ma, L. L. Meng, M. Naeem

Electrical and Computer Engineering Faculty Research & Creative Works

We present an overview of challenge problems in electromagnetic modeling of highly complex and multi-scale structures found in 3D IC, SiP, SoC, and electronic packaging necessary for signal integrity assessment. © 2013 IEEE.

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Noncontact Operation-State Monitoring Technology Based On Magnetic-Field Sensing For Overhead High-Voltage Transmission Lines, Xu Sun, Qi Huang, Yunhe Hou, Lijun Jiang, Philip W.T. Pong Aug 2013

Noncontact Operation-State Monitoring Technology Based On Magnetic-Field Sensing For Overhead High-Voltage Transmission Lines, Xu Sun, Qi Huang, Yunhe Hou, Lijun Jiang, Philip W.T. Pong

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposed a novel noncontact technology of operation-state monitoring based on magnetic-field sensing for high-voltage transmission lines, which can simultaneously measure both electrical and spatial parameters in real time. This technology was derived from research on the magnetic-field distribution at the ground level when the transmission lines operate in different states, including sagging, galloping, and current imbalance. Two typical models of high-voltage three-phase transmission lines were simulated, and the resulting magnetic fields were calculated. The correlation between the magnetic-field variations and the operation states were analyzed. Based on such correlation, a source reconstruction method was developed to reconstruct the …

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On The Futility Of Thermal Through-Silicon-Vias, Chung Han Chou, Nien Yu Tsai, Hao Yu, Yiyu Shi, Jui Hung Chien Aug 2013

On The Futility Of Thermal Through-Silicon-Vias, Chung Han Chou, Nien Yu Tsai, Hao Yu, Yiyu Shi, Jui Hung Chien

Electrical and Computer Engineering Faculty Research & Creative Works

Thermal integrity is one of the most important challenges faced by three-dimensional integrated circuits (3D ICs). Towards this, thermal through-silicon-vias (TTSVs) have been widely used to assist heat dissipation. The metal inside TTSVs can conduct heat more effectively than the silicon substrate, and the metal bumps underneath TTSVs can help heat penetrate through the inter-layer thermal interface material (TIM). However, the surrounding silicon dioxide blocks the heat flowing into them. This makes the effectiveness of TTSVs questionable. In this paper, we argue that some existing TTSV models fail to capture those effects. Experimental results based on finite element simulations verify …

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