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Full-Text Articles in Entire DC Network
Comparison Of Microwave And Conventionally Sintered Yttria-Doped Zirconia Ceramics, Colin J. Reidy, Thomas J. Fleming, Stuart Hampshire, Mark R. Towler
Comparison Of Microwave And Conventionally Sintered Yttria-Doped Zirconia Ceramics, Colin J. Reidy, Thomas J. Fleming, Stuart Hampshire, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
This paper reports on improvement of the physical and mechanical properties of Y2O3-ZrO2 ceramics through compositional optimization, the use of nanograined powders and utilization of microwave sintering. ZrO2 with 2-5 mol% Y2O3, prepared from nanopowders, was sintered in both conventional and microwave furnaces under exactly the same heating schedule. It was found that microwave sintering improves physical and mechanical properties of Y2O3-ZrO2 ceramics compared with conventional sintering. Compositions containing 2 mol% Y2O3 exhibit the greatest improvement due to retention of tetragonal ZrO …
Maximum Lifetime Coverage Preserving Scheduling Algorithms In Sensor Networks, Maggie X. Cheng, Xuan Gong
Maximum Lifetime Coverage Preserving Scheduling Algorithms In Sensor Networks, Maggie X. Cheng, Xuan Gong
Computer Science Faculty Research & Creative Works
In wireless sensor networks, when each target is covered by multiple sensors, sensors can take turns to monitor the targets in order to extend the lifetime of the network. in this paper, we address how to improve network lifetime through optimal scheduling of sensor nodes. We present two algorithms to achieve the maximum lifetime while maintaining the required coverage: A linear programming-Based exponential-time exact solution, and an approximation algorithm. Numerical simulation results from the approximation algorithm are compared to the exact solution and show a high degree of accuracy and efficiency. © 2010 Springer Science Business Media, LLC.
Paim: Peer-Based Automobile Identity Management In Vehicular Ad-Hoc Network, Anna Squicciarini, Dan Lin, Alessandro Mancarella
Paim: Peer-Based Automobile Identity Management In Vehicular Ad-Hoc Network, Anna Squicciarini, Dan Lin, Alessandro Mancarella
Computer Science Faculty Research & Creative Works
The emerging Vehicular Ad-hoc Network (VANET) technology will enable many exciting applications such as vehicular safety assistance and mobile entertainment. One of the key challenges toward successful roll-out of VANET applications is to provide security and privacy preserving mechanisms for users. Existing efforts on this topic rely heavily on infrastructure like road-side units which however are not available everywhere. to minimize the dependence on infrastructure, we propose a novel Peer-Based Automobile Identity Management (PAIM) Framework which is mainly based on vehicle-to-vehicle communication. PAIM supports dynamic event-Based moving zones formed by vehicles sharing common interest. PAIM achieves the level of privacy …
Performance Improvement For Collection Operations Using Join Query Optimization, Venkata Krishna Suhas Nerella, Sanjay Kumar Madria, Thomas Weigert
Performance Improvement For Collection Operations Using Join Query Optimization, Venkata Krishna Suhas Nerella, Sanjay Kumar Madria, Thomas Weigert
Computer Science Faculty Research & Creative Works
Programming languages with explicit support for queries over collections allow programmers to express operations on collections more abstractly than relying on their realization in loops or through provided libraries. Join optimization techniques from the field of database technology support efficient realizations of such language constructs. We describe an algorithm that performs run-time query optimization and is effective for single runs of a program. the proposed approach relies on histograms built from the data at run time to estimate the selectivity of joins and predicates in order to construct query plans. Information from earlier executions of the same query during run …
Investigating Combinatorial Approaches In Virtual Screening On Human Inducible 6-Phosphofructo-2-Kinase/Fructose-2,6-Bisphosphatase (Pfkfb3): A Case Study For Small Molecule Kinases, Robert B. Crochet, Michael C. Cavalier, Minsuh Seo, Jeong Do Kim, Young Sun Yim, Seung Jong Park, Yong Hwan Lee
Investigating Combinatorial Approaches In Virtual Screening On Human Inducible 6-Phosphofructo-2-Kinase/Fructose-2,6-Bisphosphatase (Pfkfb3): A Case Study For Small Molecule Kinases, Robert B. Crochet, Michael C. Cavalier, Minsuh Seo, Jeong Do Kim, Young Sun Yim, Seung Jong Park, Yong Hwan Lee
Computer Science Faculty Research & Creative Works
Efforts toward improving the predictiveness in tier-based approaches to virtual screening (VS) have mainly focused on protein kinases. Despite their significance as drug targets, small molecule kinases have been rarely tested with these approaches. In this paper, we investigate the efficacy of a pharmacophore screening-combined structure-based docking approach on the human inducible 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase, an emerging target for cancer chemotherapy. Six out of a total 1364 compounds from NCI's Diversity Set II were selected as true actives via throughput screening. Using a database constructed from these compounds, five programs were tested for structure-based docking (SBD) performance, the MOE of which showed …
Finite Element Based Generalized Impedance Boundary Condition For Complicated Em Calculation, Shiquan He, Zaiping Nie, Jun Zh Huang, Lijun Jiang, Weng Cho Chew
Finite Element Based Generalized Impedance Boundary Condition For Complicated Em Calculation, Shiquan He, Zaiping Nie, Jun Zh Huang, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a finite element based generalized impedance boundary condition (FEM-GIBC) is proposed to solve complicated electromagnetic (EM) problems. Complex structures with arbitrary inhomogeneity and shapes are modeled with the finite element method, and their scattering contributions are transformed to generalized impedance conditions on their boundaries. For each sub-domain, a special GIBC can be established and it is only related to the structures in this domain. Hence, for finite periodic structures, a representative GIBC can be formulated at the boundary of a unit cell. After the GIBC at each boundary is established, the electromagnetic coupling between each impedance boundary …
Modeling Electrically Small Structures In Layered Medium With Augmented Efie Method, Yongpin P. Chen, Lijun Jiang, Zhi Guo Qian, Weng Cho Chew
Modeling Electrically Small Structures In Layered Medium With Augmented Efie Method, Yongpin P. Chen, Lijun Jiang, Zhi Guo Qian, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
Electrically small structures embedded in a planarly layered medium are modeled by the augmented electric field integral equation (EFIE) method in this paper. By separating charge as extra unknown list, and enforcing the current continuity equation, an augmented EFIE (A-EFIE) can be setup. The matrix-friendly formulation of layered medium Green's function is applied and the frequency scaling of the impedance matrix in the moment method is analyzed when the frequency tends to zero. Rank deficiency and the charge neutrality enforcement is also discussed in detail. Numerical results show that the low frequency breakdown of electrically small structures embedded in a …
Finite-Width Gap Excitation And Impedance Models, Yat Hei Lo, Shiquan He, Lijun Jiang, Weng Cho Chew
Finite-Width Gap Excitation And Impedance Models, Yat Hei Lo, Shiquan He, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we present a new method for the feed model for the method of moments (MoM). It is derived from a more accurate model with the realistic size of the excitation, in order to replace the commonly-used delta-gap excitation model. This new model is formulated around the electric field integration equations (EFIE) where the terms for magnetic current and magnetic field can be removed. Hence it is much simpler to implement and reduces the numerical complexity. In addition, a variational formulation is derived to provide second order accuracy of the input admittance calculation. Moreover, this new formulation can …
The Missouri Miner, October 27, 2011
The Missouri Miner, October 27, 2011
The Missouri Miner Newspaper
No abstract provided.
A Reversibility Analysis Of Encoding Methods For Spiking Neural Networks, Catherine Johnson, S. Roychowdhury, Ganesh K. Venayagamoorthy
A Reversibility Analysis Of Encoding Methods For Spiking Neural Networks, Catherine Johnson, S. Roychowdhury, Ganesh K. Venayagamoorthy
Mining Engineering Faculty Research & Creative Works
There is much excitement surrounding the idea of using spiking neural networks (SNNs) as the next generation of function-approximating neural networks. However, with the unique mechanism of communication (neural spikes) between neurons comes the challenge of transferring real-world data into the network to process. Many different encoding methods have been developed for SNNs, most temporal and some spatial. This paper analyzes three of them (Poisson rate encoding, Gaussian receptor fields, and a dual-neuron n-bit representation) and tests to see if the information is fully transformed into the spiking patterns. an oft-neglected consideration in encoding for SNNs is whether or not …
Analysis Of Via Impedance Variations With A Polynomial Chaos Method, Jianxiang Shen, Hanfeng Wang, Ji Chen, Jun Fan
Analysis Of Via Impedance Variations With A Polynomial Chaos Method, Jianxiang Shen, Hanfeng Wang, Ji Chen, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we propose a systematic framework for the optimization and analysis of the equivalent characteristic impedance of practical via structures. the framework consists of (a) optimizing via structures for impedance matching using a Genetic algorithm, and (b) numerically characterize, by Polynomial Chaos (PC) method, the sensitivity of the equivalent characteristic impedance to the manufacturing uncertainties in the various geometrical parameters of a via structure. the PC method can be effectively used to compute important statistical information, such as moments, probabilities and sensitivities with respect to the design variables. the PC method is straightforward to implement and can be …
Statistical Estimation Of Root Mean Square Crosstalk In Sfp+ Cable Evaluations, Dazhao Liu, Jue Chen, Zhiping Yang, Jun Fan
Statistical Estimation Of Root Mean Square Crosstalk In Sfp+ Cable Evaluations, Dazhao Liu, Jue Chen, Zhiping Yang, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
A rigorous statistical estimation of the root mean square equation is proposed for near-end crosstalk simulation in SFP+ cable evaluations. This method employs the pulse response, the near-end output in the victim pair due to a single-pulse input of one bit long in the aggressor pair. This pulse response can be obtained from vector network analyzer (VNA) measurements. Thus SFP+ cable evaluations can be effectively performed using easier and more accurate frequency-domain measurements, instead of the time-domain ones defined in the specification. © 2011 IEEE.
Optimizing Decoupling Capacitor Placement To Reduce Effective Inductance, Bruce Archambeault, Jingook Kim, Sam Connor, Jun Fan
Optimizing Decoupling Capacitor Placement To Reduce Effective Inductance, Bruce Archambeault, Jingook Kim, Sam Connor, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
Optimizing decoupling capacitor placement to ensure rapid charge delivery is discussed in this paper. Placing additional decoupling capacitors in close proximity may reduce effective inductance but this inductance is only reduced under certain conditions. © 2011 IEEE.
High Frequency Permeability Of Fe-Al-Si Granular Composite Materials, Takanori Tsutaoka, Taisuke Ono, Aiko Tsurunaga, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva
High Frequency Permeability Of Fe-Al-Si Granular Composite Materials, Takanori Tsutaoka, Taisuke Ono, Aiko Tsurunaga, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva
Electrical and Computer Engineering Faculty Research & Creative Works
High-frequency electromagnetic properties of Fe-Al-Si alloy (Sendust) granular composite materials have been studied by measuring their relative complex permeability (μr = μr’ – jμr”) and permittivity (εr = εr’ – j εr”) spectra. The bulk Fe-Al-Si alloy shows metallic electrical conduction, and permeability decreases rapidly with frequency. On the other hand, Sendust powder shows relatively high electrical resistivity. Sendust composite material demonstrates insulating electrical properties up to at least 80 vol.% particle content. Thus the relatively high permeability in the microwave frequency range can be obtained. Frequency dispersion characteristics of …
Multipoint Model Order Reduction Of Delayed Peec Systems, Francesco Ferranti, Michel Nakhla, Giulio Antonini, Tom Dhaene, Luc Knockaert, Albert E. Ruehli
Multipoint Model Order Reduction Of Delayed Peec Systems, Francesco Ferranti, Michel Nakhla, Giulio Antonini, Tom Dhaene, Luc Knockaert, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
We present a new model order reduction technique for electrically large systems with delay elements, which can be modeled by means of neutral delayed differential equations. an adaptive multipoint expansion and model order reduction of equivalent first order systems are combined in the new proposed method that preserves the neutral delayed differential formulation. an adaptive algorithm to select the expansion points is presented. the proposed model order reduction technique is validated by pertinent numerical results. a comparison with a previous model order reduction algorithm based on a single point expansion is performed to show the considerably improved modeling capability of …
Near-Field H To E Transformation Using Plane Wave Spectrum Theory, Zhenwei Yu, Yaojiang Zhang, Soji Sajuyigbe, R. Camacho, Jason A. Mix, Kevin Slattery, Matthew S. Halligan, Jun Fan
Near-Field H To E Transformation Using Plane Wave Spectrum Theory, Zhenwei Yu, Yaojiang Zhang, Soji Sajuyigbe, R. Camacho, Jason A. Mix, Kevin Slattery, Matthew S. Halligan, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
Near-field measurements are widely used to indicate the radiation from integrated circuits (IC). to minimize the number of field components measured in a near-field scan, it is necessary to calculate the electric field from magnetic field or vice versa. in this paper, a method based on plane wave spectrum theory is proposed to perform the H to E transformation, and a filtering technique is proposed to address the noise problem in the calculation. a simple active circuit in a 3-D full-wave simulation tool is used to validate this method. This method is useful to reduce the number of field components …
Skin-Effect Model For Time And Frequency Domain Peec Solver, Giulio Antonini, Albert E. Ruehli
Skin-Effect Model For Time And Frequency Domain Peec Solver, Giulio Antonini, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
A challenging issue for the solution of large electromagnetic problems is the efficient modeling of the broadband skin-effect for conducting planes and 3D shapes. the inclusion of such models in an EM solver can be very costly in compute time and memory requirements. Progress has recently been made in the design of skin-effect models. Several properties of a model are desirable for the solution of practical problems such as the broadband frequency domain or the time domain applicability. in this paper, we present a new model which meets some of these challenges and which is suitable for the PEEC solution …
Characterization And Modeling Of A Grid-Connected Photovoltaic System Using A Recurrent Neural Network, Daniel M. Riley, Ganesh K. Venayagamoorthy
Characterization And Modeling Of A Grid-Connected Photovoltaic System Using A Recurrent Neural Network, Daniel M. Riley, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Photovoltaic (PV) system modeling is used throughout the photovoltaic industry for the prediction of PV system output under a given set of weather conditions. PV system modeling has a wide range of uses including: prepurchase comparisons of PV system components, system health monitoring, and payback (return on investment) times. in order to adequately model a PV system, the system must be characterized to establish the relationship between given weather inputs (e.g., irradiance, spectrum, temperature) and desired system outputs (e.g., AC power, module temperature). Traditional approaches to system characterization involve characterizing and modeling each component in a PV system and forming …
A Novel Characterization Method Of The Radiation Emission For Electromagnetic Compatibility, Ping Li, Lijun Jiang
A Novel Characterization Method Of The Radiation Emission For Electromagnetic Compatibility, Ping Li, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Conventionally the radiation emissions from PCB boards, electronic devices and antennas were characterized through the near field (NF)-far field (FF) transformation to find the equivalent sources. In this paper, a new methodology without NF-FF transformation is presented. Based on the uniqueness theorem, it only employs the measured tangential field over a spherical surface to rigorously characterize the outward radiation emission. The dyadic Green's function for the perfect magnetic conductor (PMC) sphere is derived using spherical wave functions. Based on this dyadic Green's function and integral equations, the NF-FF transformation is not necessary any more. To facilitate feasible near field measurements, …
Estimation Of Crosstalk Among Multiple Stripline Traces Crossing A Split By Compressed Sensing, Tao Wang, Yiyu Shi, Songping Wu, Jun Fan
Estimation Of Crosstalk Among Multiple Stripline Traces Crossing A Split By Compressed Sensing, Tao Wang, Yiyu Shi, Songping Wu, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
In printed circuit board (PCB) designs, it is common to split power/ground planes into different partitions, which leads to more crosstalk among signal traces that route crossing a split. It is of general interest to develop a crosstalk model for various geometric parameters. However, the long time required to simulate the structure with any given set of geometric parameters renders general modelling approaches such as interpolation inefficient. in this paper, we develop an empirical model based upon the compressed sensing technique to characterize the crosstalk among traces as a function of geometric parameters. a good agreement between the empirical model …
Modeling And Analysis Of A Trace Referenced To A Meshed Ground Plane, Songping Wu, Hao Shi, Matthew Herndon, Bill Cornelius, Matt Halligan, Jun Fan
Modeling And Analysis Of A Trace Referenced To A Meshed Ground Plane, Songping Wu, Hao Shi, Matthew Herndon, Bill Cornelius, Matt Halligan, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
Meshed planes are used in today's flexible PCB designs, and due to their non-homogeneous nature, Modeling of nearby interconnects increases in complexity. in this paper, a method to evaluate the effective characteristic impedance of a trace referenced to a meshed plane is proposed that is simpler and optimization based. the effective impedance and the per-unit-length parameters of the line were associated with the meshed plane periodical patterns as well as trace relative locations. a systematic study was performed to reveal the essential relationship between the meshed plane geometric parameters and the trace characteristics. © 2011 IEEE.
Parametric Study On The Effect Of Asymmetry In Multi-Channel Differential Signaling, Ki Jin Han, Xiaoxiong Gu, Young H. Kwark, Zhenwei Yu, Dazhao Liu, Bruce Archambeault, Samuel R. Connor, Jun Fan
Parametric Study On The Effect Of Asymmetry In Multi-Channel Differential Signaling, Ki Jin Han, Xiaoxiong Gu, Young H. Kwark, Zhenwei Yu, Dazhao Liu, Bruce Archambeault, Samuel R. Connor, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
The effects of geometric asymmetry on the electrical performance of multi-channel differential signaling in printed circuit boards are investigated in this paper. the asymmetry, which is the origin of noise coupled through mode conversion, is difficult to control in real channel structures, where a large number of vias and traces are populated. Supported by an efficient parametric simulation tool, this paper presents the effects of the asymmetry on mode conversion and differential mode crosstalk in real multi-channel structures. This extensive parametric study was used to define design guidelines to suppress this noise coupling by adding ground vias in strategic locations. …
Full-Wave Emc Simulations Using Maxwell Garnett Model For Composites With Cylindrical Inclusions, M. H. Nisanci, F. De Paulis, Marina Koledintseva, A. Orlandi
Full-Wave Emc Simulations Using Maxwell Garnett Model For Composites With Cylindrical Inclusions, M. H. Nisanci, F. De Paulis, Marina Koledintseva, A. Orlandi
Electrical and Computer Engineering Faculty Research & Creative Works
Four different models for effective dielectric properties of biphasic composite containing random or aligned cylindrical inclusions are considered in this paper. These models are based on the Maxwell Garnett (MG) mixing rule. The effects of distribution and orientation of cylindrical inclusions in a composite material is studied. An equivalent averaged material with Debye-like frequency characteristics, suitable for time-domain full-wave numerical electromagnetic simulations is retrieved. This Debye model is derived from the Maxwell Garnett formulation. The numerical model test structure consists of a composite slab inserted in a rectangular waveguide. Simulations are run for the frequency range above the cut-off frequency …
Measurement Of Multiple Switching Current Components Through A Bulk Decoupling Capacitor Using A Lab-Made Low-Cost Current Probe, Liang Li, Jingook Kim, Hanfeng Wang, Songping Wu, Yuzo Takita, Hayato Takeuchi, Kenji Araki, Jun Fan
Measurement Of Multiple Switching Current Components Through A Bulk Decoupling Capacitor Using A Lab-Made Low-Cost Current Probe, Liang Li, Jingook Kim, Hanfeng Wang, Songping Wu, Yuzo Takita, Hayato Takeuchi, Kenji Araki, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a measurement-Based data-processing approach to obtain parameters of multiple current components through a bulk decoupling capacitor for power integrity studies. a lab-made low-cost current probe is developed to measure the induced voltage due to the time-varying switching current. Then, a post data-processing procedure is introduced to separate and obtain the parameters of multiple current components. the results obtained by the proposed method are validated with other approaches. © 2011 IEEE.
The Missouri Miner, October 20, 2011
The Missouri Miner, October 20, 2011
The Missouri Miner Newspaper
No abstract provided.
Faculty Senate Minutes October 20, 2011, Missouri University Of Science And Technology Faculty Senate
Faculty Senate Minutes October 20, 2011, Missouri University Of Science And Technology Faculty Senate
Minutes & Agendas
No abstract provided.
The Missouri Miner, October 13, 2011
The Missouri Miner, October 13, 2011
The Missouri Miner Newspaper
No abstract provided.
Grid Frequency And Voltage Support Using Pv Systems With Energy Storage, Ravi Bhatt, Badrul H. Chowdhury
Grid Frequency And Voltage Support Using Pv Systems With Energy Storage, Ravi Bhatt, Badrul H. Chowdhury
Electrical and Computer Engineering Faculty Research & Creative Works
An optimized operating scheme for a utility connected community based photovoltaic (PV) system is described. the system can participate in grid ancillary services like frequency and voltage regulation functions based on the Smart Grid framework. the proposed model comprises of a PV plant with Li-ion batteries coupled to the grid with the help of a three-phase inverter. a two-way communication between the PV plant and the grid is assumed. the PV/storage plant provides constant updates on its current kW/kVar capability, and the grid transmits the demand for specific amounts of power and for specific lengths of time. the battery charging …
Investment Payback Calculator For Distributed Generation Sources, Md Rasheduzzaman, Elizabeth Stahlman, Badrul H. Chowdhury
Investment Payback Calculator For Distributed Generation Sources, Md Rasheduzzaman, Elizabeth Stahlman, Badrul H. Chowdhury
Electrical and Computer Engineering Faculty Research & Creative Works
The development of a distributed generation payback calculator that can be used for different types of energy technologies such as small wind turbines, fuel cells, microturbines, solar PV and other technologies is presented. the payback calculator takes several inputs such as technology costs, expected life of the project, capacity factor, system size, customer type, and several other relevant parameters. from these inputs, the calculator computes several different outputs including the total energy produced within a year, the rate of return, total expenses, total cash flow, and the discounted payback period in years. the calculator is embedded into a website available …
Analysis Of Unbalanced System Efficiency With A Positive Sequence Power Flow Program, Karl Stefanski, Badrul H. Chowdhury
Analysis Of Unbalanced System Efficiency With A Positive Sequence Power Flow Program, Karl Stefanski, Badrul H. Chowdhury
Electrical and Computer Engineering Faculty Research & Creative Works
Most existing power flow programs assume balanced loading where the positive sequence impedances are sufficient to use. However, a more accurate approach is often required due to the increasing penetration of single-phase distributed generation sources on distribution grids which tend to introduce large imbalances. the proposed method uses a positive sequence power flow algorithm where the inputs are modified to accurately simulate an unbalanced system. the algorithm is tested on the IEEE 4-bus system and the results compared with published results. the impact of the analysis on system efficiency calculations are shown for the 4-bus system as well as for …