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Articles 14251 - 14280 of 14459
Full-Text Articles in Entire DC Network
Vitellaria Paradoxa And The Feasibility Of A Shea Butter Project In The North Of Cameroon, Karin L. Vermilye
Vitellaria Paradoxa And The Feasibility Of A Shea Butter Project In The North Of Cameroon, Karin L. Vermilye
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
What We Live In| [Poems], Elizabeth K. Currey
What We Live In| [Poems], Elizabeth K. Currey
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
A Method For Enhancing The Snapshot Performance In San Volume Manager, Chang-Soo Kim, Dong-Jae Kang, Young-Ho Kim, Hag-Young Kim, Myoung-Jun Kim, Yu-Hyeon Bak
A Method For Enhancing The Snapshot Performance In San Volume Manager, Chang-Soo Kim, Dong-Jae Kang, Young-Ho Kim, Hag-Young Kim, Myoung-Jun Kim, Yu-Hyeon Bak
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
A New Estimative Current Mode Control Technique For Dc-Dc Converters Operating In Discontinuous Conduction Mode, Mehdi Ferdowsi, Zhong Nie, Ali Emadi
A New Estimative Current Mode Control Technique For Dc-Dc Converters Operating In Discontinuous Conduction Mode, Mehdi Ferdowsi, Zhong Nie, Ali Emadi
Electrical and Computer Engineering Faculty Research & Creative Works
A new digital control technique for power converters operating in discontinuous conduction mode (DCM) is introduced and applied to a boost converter. In contrast to the conventional analogue control methods, the principal idea of this new control scheme is to use real-time analysis and estimate the required on-time of the switch based on the dynamic of the system. The proposed control algorithm can easily be programmed in a digital signal processor (DSP). This novel technique is applicable to any converter operating in DCM including power factor correctors (PFC). However, this work mainly focuses on the boost topology. In this paper, …
Pari Passu And A Distressed Sovereign's Rational Choices, William W. Bratton
Pari Passu And A Distressed Sovereign's Rational Choices, William W. Bratton
Georgetown Law Faculty Publications and Other Works
Part I describes the disruptive role the pari passu clause plays in sovereign debt compositions, stating the case favoring the narrow reading. Part II reconsiders the economic incentives in play at the time lenders close loans to sovereigns, stating a case for the broad reading. Part III works the competing readings through the legal framework of bond contract interpretation. The exercise shows that the matter comes down to a choice between an ex ante reading, conducted as of the time the contract is executed and delivered, and an ex post reading, conducted as of the later time of distress. The …
Boost Integrated Push-Pull Rectifier With Power Factor Correction And Output Voltage Regulation Using A New Digital Control Technique, Zhong Nie, Mehdi Ferdowsi, Ali Emadi
Boost Integrated Push-Pull Rectifier With Power Factor Correction And Output Voltage Regulation Using A New Digital Control Technique, Zhong Nie, Mehdi Ferdowsi, Ali Emadi
Electrical and Computer Engineering Faculty Research & Creative Works
An integrated converter is a synthesized converter based on the overall system integration, which is simplified by the system objective and can implement the system functions similar to the discrete converters. An integrated converter consists of converter sets; each converter set has a special function defined by the designer. A family of DC/DC Boost based integrated rectifiers with two active switches can be derived by the integration concept. In this paper, Boost + Push-Pull integrated converter is introduced and derived. To regulate the output voltage and shape the input current, a new simple digital control method is applied. In contrast …
There's A Song Of Distance, Matthew Eck
There's A Song Of Distance, Matthew Eck
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
Thunder Over The North| Air-To-Air Combat Over North Vietnam, Benjamin B. Donnelly
Thunder Over The North| Air-To-Air Combat Over North Vietnam, Benjamin B. Donnelly
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
Ergodic Capacity Of Doubly Selective Rayleigh Fading Mimo Channels, Chengshan Xiao, Y. Rosa Zheng
Ergodic Capacity Of Doubly Selective Rayleigh Fading Mimo Channels, Chengshan Xiao, Y. Rosa Zheng
Electrical and Computer Engineering Faculty Research & Creative Works
The ergodic capacity is investigated for doubly selective (frequency selective and time varying) MIMO Rayleigh fading channels. A closed form formula is derived that quantifies the effect of the ISI fading on the ergodic capacity into an ISI degradation factor. It is discovered that, in general frequency selective MIMO channels, the inter-tap correlations of the ISI fading will reduce the ergodic capacity comparing to the frequency flat fading channel. Only in the special case when the ISI fading does not have inter-tap correlations will the ergodic capacity be the same as that of the frequency flat channel. This new formula …
Evolutionary Algorithms, Markov Decision Processes, Adaptive Critic Designs, And Clustering: Commonalities, Hybridization And Performance, Donald C. Wunsch, Samuel A. Mulder
Evolutionary Algorithms, Markov Decision Processes, Adaptive Critic Designs, And Clustering: Commonalities, Hybridization And Performance, Donald C. Wunsch, Samuel A. Mulder
Electrical and Computer Engineering Faculty Research & Creative Works
We briefly review and compare the mathematical formulation of Markov decision processes (MDP) and evolutionary algorithms (EA). In so doing, we observe that the adaptive critic design (ACD) approach to MDP can be viewed as a special form of EA. This leads us to pose pertinent questions about possible expansions of the methodology of ACD. This expansive view of EA is not limited to ACD. We discuss how it is possible to consider the powerful chained Lin Kernighan (chained LK) algorithm for the traveling salesman problem (TSP) as a degenerate case of EA. Finally, we review some recent TSP results, …
People I Knew From Home| A Collection Of Short Stories, Amy Brown
People I Knew From Home| A Collection Of Short Stories, Amy Brown
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
Powder River Country, Marianne Zugel
Powder River Country, Marianne Zugel
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
Copy This Essay: How Fair Use Doctrine Harms Free Speech And How Copying Serves It, Rebecca Tushnet
Copy This Essay: How Fair Use Doctrine Harms Free Speech And How Copying Serves It, Rebecca Tushnet
Georgetown Law Faculty Publications and Other Works
Defenders of transformative uses have invoked the First Amendment to bolster claims that such uses should not be subject to the copyright owner’s permission. But this focus on transformation is critically incomplete, leaving unchallenged much of copyright’s scope, despite the large number of nontransformative copying activities that are also instances of free speech. The current debate leaves the way open for expansions of copyright that, while not targeted at dissenting viewpoints, nonetheless may have a profoundly negative effect on freedom of speech. In other words, transformation has limited our thinking about the free speech interests implicated by copying. This essay …
The Moral Foundations Of Modern Libertarianism, Randy E. Barnett
The Moral Foundations Of Modern Libertarianism, Randy E. Barnett
Georgetown Law Faculty Publications and Other Works
Libertarians no longer argue, as they once did in the 1970s, about whether libertarianism must be grounded on moral rights or on consequences; they no longer act as though they must choose between these two moral views. In this paper, the author contends that libertarians need not choose between moral rights and consequences because theirs is a political, not a moral, philosophy, one that can be shown to be compatible with various moral theories, which is one source of its appeal.
Moral theories based on either moral rights or on consequentialism purport to be comprehensive, insofar as they apply to …
A Preliminary Study Of Maximum System-Level Crosstalk At High Frequencies For Coupled Transmission Lines, H. Weng, Daryl G. Beetner, Todd H. Hubing, R. Wiese, J. Mccallum, Xiaopeng Dong
A Preliminary Study Of Maximum System-Level Crosstalk At High Frequencies For Coupled Transmission Lines, H. Weng, Daryl G. Beetner, Todd H. Hubing, R. Wiese, J. Mccallum, Xiaopeng Dong
Electrical and Computer Engineering Faculty Research & Creative Works
Simple formulas were derived to quickly estimate maximum crosstalk between wires in a harness at high frequencies, where the length of circuits is comparable with or greater than the wavelength of the signals of interest. Formulas were derived from multi-conductor transmission line theory. When the source and load resistances are either both large or both small compared to the characteristic impedance of the transmission line, maximum coupling is shown to be given by approximately XMAX = Cm / (C22 + Cm). A similar equation was found for the case where the load impedances are matched. …
Adaptive Critics For Dynamic Particle Swarm Optimization, Ganesh K. Venayagamoorthy
Adaptive Critics For Dynamic Particle Swarm Optimization, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
This work introduces a novel technique for dynamic particle swarm optimization (DPSO) using adaptive critic designs. The adaptation between global and local search in an optimization algorithm is critical for optimization problems especially in a dynamically changing environment or process over time. The inertia weight in particle swarm optimization (PSO) is dynamically adjusted in this paper in order to provide a nonlinear search capability for the PSO algorithm. Results on benchmark functions in the literature are provided.
Michelangelo And Leonardo| The Frescoes For The Palazzo Vecchio, Paula Rae Duncan
Michelangelo And Leonardo| The Frescoes For The Palazzo Vecchio, Paula Rae Duncan
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
Spectrum Visualization And Measurement Of Power Parameters Of Microwave Wide-Band Noise, Marina Koledintseva, Alexander A. Kitaytsev, V. A. Konkin, V. Radchenko
Spectrum Visualization And Measurement Of Power Parameters Of Microwave Wide-Band Noise, Marina Koledintseva, Alexander A. Kitaytsev, V. A. Konkin, V. Radchenko
Electrical and Computer Engineering Faculty Research & Creative Works
A method for an adequate visualization of a microwave intense noise spectrum envelope in a wide frequency range (several octaves), measurement of its power parameters, and detection of a narrow-band signal with unknown frequency and power against the noise background is presented. This method is based on an application of a nonheterodyne principle of microwave frequency (and power) conversion using a gyromagnetic converter, which operates in two regimes in turn: the resonance detection and the cross-multiplication. A block scheme and an operation of a two-channel measuring device combining the mentioned functions are discussed.
Supervisory Level Neural Network Identifier For A Small Power System With A Statcom And A Generator, Salman Mohagheghi, Ganesh K. Venayagamoorthy, Ronald G. Harley
Supervisory Level Neural Network Identifier For A Small Power System With A Statcom And A Generator, Salman Mohagheghi, Ganesh K. Venayagamoorthy, Ronald G. Harley
Electrical and Computer Engineering Faculty Research & Creative Works
A neural network based identifier is designed for effective control of a small power system. The power network in this work is considered from an external point of view, i.e., from a supervisory level. Such a neuroidentifier can serve as a general model of such a plant, and then used for different neural network based control schemes.
Swarm Intelligence For Digital Circuits Implementation On Field Programmable Gate Arrays Platforms, Ganesh K. Venayagamoorthy, Venu Gopal Gudise
Swarm Intelligence For Digital Circuits Implementation On Field Programmable Gate Arrays Platforms, Ganesh K. Venayagamoorthy, Venu Gopal Gudise
Electrical and Computer Engineering Faculty Research & Creative Works
Field programmable gate arrays (FPGAs) are becoming increasingly important implementation platforms for digital circuits. One of the necessary requirements to effectively utilize the FPGA's resources is an efficient placement and routing mechanism. This paper presents an optimization technique based on swarm intelligence for FPGA placement and routing. Mentor graphics technology mapping netlist file is used to generate initial FPGA placements and routings which are then optimized by particle swarm optimization (PSO). Results for the implementation of a binary coded decimal bidirectional counter and an arithmetic logic unit on a Xilinx FPGA show that PSO is a potential technique for solving …
Temperature Considerations In Solar Arrays, Steve Eugene Watkins, Min-Jung Wu, E. J. Timpson
Temperature Considerations In Solar Arrays, Steve Eugene Watkins, Min-Jung Wu, E. J. Timpson
Electrical and Computer Engineering Faculty Research & Creative Works
Temperature is an important consideration in the operation of photovoltaic (PV) arrays. In particular, daily and seasonal temperature variations are a limitation on the application of solar power to homes. At lower temperatures, PV systems produce more power. For higher temperatures, optimum operation requires modification of electrical load and removal of excess heat. Several technologies and approaches are available. To pursue this system optimization, PV cells were investigated at different temperatures. These investigations are compared with simulated theoretical results to draw more specific conclusions that can be applied to a solar house. A temperature reduction of 60⁰C improved the power …
Time Series Prediction With A Weighted Bidirectional Multi-Stream Extended Kalman Filter, Donald C. Wunsch, Xiao Hu
Time Series Prediction With A Weighted Bidirectional Multi-Stream Extended Kalman Filter, Donald C. Wunsch, Xiao Hu
Electrical and Computer Engineering Faculty Research & Creative Works
This paper describes the use of a multi-stream extended Kalman filter (EKF) to tackle the IJCNN 2004 challenge problem - time series prediction on CATS benchmark. A weighted bidirectional approach was adopted in the experiments to incorporate the forward and backward predictions of the time series. EKF is a practical, general approach to neural networks training. It consists of the following: 1) gradient calculation by backpropagation through time (BPTT); 2) weight updates based on the extended Kalman filter; and 3) data presentation using multi-stream mechanics.
Time Series Prediction With Recurrent Neural Networks Using A Hybrid Pso-Ea Algorithm, Nian Zhang, Ganesh K. Venayagamoorthy, Donald C. Wunsch, Xindi Cai
Time Series Prediction With Recurrent Neural Networks Using A Hybrid Pso-Ea Algorithm, Nian Zhang, Ganesh K. Venayagamoorthy, Donald C. Wunsch, Xindi Cai
Electrical and Computer Engineering Faculty Research & Creative Works
To predict the 100 missing values from the time series consisting of 5000 data given for the IJCNN 2004 time series prediction competition, we applied an architecture which automates the design of recurrent neural networks using a new evolutionary learning algorithm. This new evolutionary learning algorithm is based on a hybrid of particle swarm optimization (PSO) and evolutionary algorithm (EA). By combining the searching abilities of these two global optimization methods, the evolution of individuals is no longer restricted to be in the same generation, and better performed individuals may produce offspring to replace those with poor performance. The novel …
Using Near-Field Scanning To Predict Radiated Fields, Jin Shi, Michael A. Cracraft, Jianmin Zhang, Richard E. Dubroff, Kevin P. Slattery, Masahiro Yamaguchi
Using Near-Field Scanning To Predict Radiated Fields, Jin Shi, Michael A. Cracraft, Jianmin Zhang, Richard E. Dubroff, Kevin P. Slattery, Masahiro Yamaguchi
Electrical and Computer Engineering Faculty Research & Creative Works
Near-field scanning has often been used to measure and characterize magnetic fields surrounding individual integrated circuits (IC) and high speed digital electronic circuits. The paper describes the use of near-field scanning data, performed in a typical laboratory bench top environment, to predict radiated electromagnetic interference (EMI) in a typical product environment. The product environment may include enclosures and apertures. The approach begins by acquiring sufficient near-field scanning data to allow representation of an unintentional radiating source by an equivalent surface current distribution. The equivalent current distribution is used as a source in numerical full wave modeling. The agreement between direct …
The Avid Sportsman And The Scope For Self-Protection: When Exculpatory Clauses Should Be Enforced, Robert Heidt
The Avid Sportsman And The Scope For Self-Protection: When Exculpatory Clauses Should Be Enforced, Robert Heidt
University of Richmond Law Review
No abstract provided.
Inference Of Genetic Regulatory Networks With Recurrent Neural Network Models, Rui Xu, Xiao Hu, Donald C. Wunsch
Inference Of Genetic Regulatory Networks With Recurrent Neural Network Models, Rui Xu, Xiao Hu, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
Large-scale gene expression data coming from microarray experiments provide us a new means to reveal fundamental cellular processes, investigate functions of genes, and understand relations and interactions among them. To infer genetic regulatory networks from these data with effective computational tools has become increasingly important Several mathematical models, including Boolean networks, Bayesian networks, dynamic Bayesian networks, and linear additive regulation models, have been used to explore the behaviors of regulatory networks. In this paper, we investigate the inference of genetic regulatory networks from time series gene expression in the framework of recurrent neural network model.
Mas-Mom Hybrid Method With Wire's Image Using In Excitation Problems, D. G. Kakulia, David Pommerenke, Kai Xiao, D. D. Karkashadze, K. N. Tavzarashvili, G. N. Ghvedashvili, R. S. Zaridze
Mas-Mom Hybrid Method With Wire's Image Using In Excitation Problems, D. G. Kakulia, David Pommerenke, Kai Xiao, D. D. Karkashadze, K. N. Tavzarashvili, G. N. Ghvedashvili, R. S. Zaridze
Electrical and Computer Engineering Faculty Research & Creative Works
An important class of problems is the interaction of an antenna with the cavity of a semi-open metallic structure. In a working environment, an antenna may change its performance due to interactions with its surroundings. This is especially true in automotive applications. Therefore, it is important to consider the interaction of an antenna with possible resonating parts, and to solve these complex electrodynamics problems together. The development of methods for modeling and studying electromagnetic compatibility (EMC) problems has practical value. The method of auxiliary sources (MAS) with the method of moments (MoM) is applied to solve the excitation problem where …
Measuring The Robustness Of A Resource Allocation, Shoukat Ali, A. A. Maciejewski, Howard Jay Siegel, Jong-Kook Kim
Measuring The Robustness Of A Resource Allocation, Shoukat Ali, A. A. Maciejewski, Howard Jay Siegel, Jong-Kook Kim
Electrical and Computer Engineering Faculty Research & Creative Works
Parallel and distributed systems may operate in an environment that undergoes unpredictable changes causing certain system performance features to degrade. Such systems need robustness to guarantee limited degradation despite fluctuations in the behavior of its component parts or environment. This research investigates the robustness of an allocation of resources to tasks in parallel and distributed systems. The main contributions are 1) a mathematical description of a metric for the robustness of a resource allocation with respect to desired system performance features against multiple perturbations in multiple system and environmental conditions, and 2) a procedure for deriving a robustness metric for …
Modeling The Wave Propagation Properties Of Power Cables Using Numerical Simulations, R. Papazyan, David Pommerenke, R. Eriksson
Modeling The Wave Propagation Properties Of Power Cables Using Numerical Simulations, R. Papazyan, David Pommerenke, R. Eriksson
Electrical and Computer Engineering Faculty Research & Creative Works
The high frequency properties of coaxial power cables are modeled using time- and frequency-domain numerical simulations. This is required due to the complex helical structure of the outer metallic screen. It is established that this screen design causes a dependence of the cable characteristics on the surrounding medium
I Chopped Down This House For You, Simeon Mills
I Chopped Down This House For You, Simeon Mills
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.