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arXiv 2018年

作者： Sun, Yu Xu, Shiqi Li, Yunzhe Tian, Lei Wohlberg, Brendt Kamilov, Ulugbek S. Department of Computer Science and Engineering Washington University in St. Louis MO63130 United States Department of Electrical and Systems Engineering Washington University in St. Louis MO63130 United States Department of Electrical and Computer Engineering Boston University BostonMA02215 United States Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States

The plug-and-play priors (PnP) framework has been recently shown to achieve state-of-the-art results in regularized image reconstruction by leveraging a sophisticated denoiser within an iterative algorithm. In this paper, we propose a new online PnP algorithm for Fourier ptychographic microscopy (FPM) based on the fast iterative shrinkage/threshold algorithm (FISTA). Specifically, the proposed algorithm uses only a subset of measurements, which makes it scalable to a large set of measurements. We validate the algorithm by showing that it can lead to significant performance gains on both simulated and experimental data. Copyright © 2018, The Authors. All rights reserved.

关键词： Image reconstruction

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Comparative study on arc extinction process under air, CO2 and SF6 gas blasting using two-dimensional electron density imaging sensor 24

Comparative study on arc extinction process under air, CO2 a...

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24th International Conference and Exhibition on Electricity Distribution, CIRED 2017

作者： Inada, Yuki Yamaguchi, Shotaro Kumada, Akiko Ikeda, Hisatoshi Hidaka, Kunihiko Nakano, Tomoyuki Murai, Kosuke Tanaka, Yasunori Division of Mathematics Electronics and Information Sciences Saitama University Saitama Japan Department of Electrical Engineering and Information Systems University of Tokyo Tokyo Japan Faculty of Electrical and Computer Engineering Kanazawa University Ishikawa Japan

Shack-Hartmann type laser wavefront sensors were applied to gas-blasted arc discharges under current-zero phases generated in a 50-mm-long interelectrode gap confined by a gas flow nozzle, in order to conduct a systematic comparison of electron density decaying processes for three kinds of arc-quenching gas media: air, CO2 and SF6. The experimental results for the air and CO2 arc plasmas showed that the electron densities and arc diameters took the minimum values around the nozzle throat inlet with the maximum blasting gas speed and the resulting stronger convection loss in the arc radial direction. On the other hand, the SF6 arc discharges had a shot-to-shot variation in the electron densities and arc diameters, and these parameters were not always smallest in the upper stream nozzle regions with the highest blasting gas speeds. The decaying time constants of the electron density decreased in an order of air, CO2 and SF6, which could be predominantly determined by the intensity of the turbulent flow. © 2017 The Institution of engineering and Technology. All rights reserved.

关键词： Two dimensional electron gas

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Prioritizing Data/Energy Thresholding-Based Antenna Switching for SWIPT-Enabled Secondary Receiver in Cognitive Radio Networks

Prioritizing Data/Energy Thresholding-Based Antenna Switchin...

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作者： Benkhelifa, Fatma Alouini, Mohamed-Slim Division of Computer Electrical and Mathematical Sciences and Engineering King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia

Simultaneous wireless power and information transfer is considered in cognitive radio networks with a multi-antenna energy harvesting (EH) secondary receiver (SR). The SR harvests the energy from the secondary transmitter and primary transmitter. The SR uses the antenna switching (AS) technique which selects a subset of antennas to decode the information [namely, the information decoding (ID) antennas] and the rest to harvest the energy (namely the EH antennas). The AS technique is performed via a thresholding-based strategy inspired from the maximum ratio combining technique with an output threshold which is proposed in two ways: 1) the prioritizing data selection (PDS) scheme and 2) the prioritizing energy selection (PES) scheme. For both schemes, we study the expressions and the asymptotic results of the probability mass function of the selected ID antennas, the average harvested energy, the power outage probability, and the data outage probability. We deduce the performance of the joint PDS and PES scheme. We evaluate all performance metrics for the Rayleigh and Nakagami fading channels. Through the simulation results, we show the impact of different simulation parameters on the performance metrics. We also show that there is a tradeoff between the data and energy performance metrics. © 2015 IEEE.

关键词： Energy harvesting

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Bifocal technique applied to dual transmitarray antennas 12

Bifocal technique applied to dual transmitarray antennas

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12th European Conference on Antennas and Propagation, EuCAP 2018

作者： Martinez-De-Rioja, Eduardo Encinar, José A. Pino, Antonio Gonzalez-Valdes, Borja Hum, Sean V. Tienda, Carolina Toso, Giovanni Information Processing and Telecomm. Center Universidad Politécnica de Madrid Spain Department of Signal Theory and Communications Universidad de Vigo Spain Dept. of Electrical and Computer Engineering University of Toronto Canada Antenna Group Airbus Defence and Space Stevenage United Kingdom Electromagnetics Division European Space Agency Noordwijk Netherlands

ISBN: (纸本)9781785617911

The bifocal technique has been applied to dual transmitarray antennas in order to improve the performance of multi-beam satellite antennas in Ka-band. The use of a transmitarray design allows centered and rotationally symmetrical geometries to be used without blockage. Different dual transmitarray configurations have been studied for operation in transmission in Ka-band (20 GHz), and the bifocal technique has been evaluated for the generation of closely-spaced beams. The results of the simulations show that it is possible to achieve a high degree of beam compression, but at the cost of a reduction in the antenna radiation efficiency. © Institution of engineering and *** Rights Reserved.

关键词： Satellite antennas

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Thermal Annealing of Gold Thin Films on the Structure and Surface Morphology Using RF Magnetron Sputtering

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材料科学与工程（中英文B版） 2018年第2期8卷 66-76页

作者： Moniruzzaman Syed Caleb Glaser Cameron Hynes Muhtadyuzzaman Syed Division of Natural and Mathematical Sciences Lemoyne-Owen CollegeMemphisTN 38126USA Sandia National Laboratories AlbuquerqueNM 87185USA Department of Electrical and Computer Engineering Purdue UniversityWest LafayetteIN 47907USA

Gold(Au)thin films were deposited on SiO2 substrate under argon(Ar)gas environment using RF(radio frequency)magnetron sputtering at room temperature for various deposition *** samples have been annealed at the temperature range of 250-450°*** change of the structural and surface morphological properties of both as-deposited and annealed films has been studied using an AFM(atomic force microscope),XRD(X-ray diffraction)and Raman *** improvement of crystallinity was observed at the annealing temperature of 350°C and degradation was found *** agreement with XRD and Raman measurements,both crystallite size and crystalline volume fraction were found to be increased having maximum at 350°C and decreased *** result can be explained by simple kinetic theory where sticking probabilities,Au structures agglomerated on SiO2 surfaces and surface coverage of Au atoms must be ***,it can also be explained by the occurrence of two competing phenomena like roughening induced grain growth and smoothing induced inhibition of grain growth with increasing annealing *** mechanisms are also discussed.

关键词： Gold annealing and magnetron sputtering

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Flexible and efficient model-based congestion detection approach

Flexible and efficient model-based congestion detection appr...

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International Conference on Control, engineering & Information Technology (CEIT)

作者： Zeroual Abdelhafid Fouzi Harrou Ying Sun CReSTIC university of Reims Champagne-ardenne France Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

ISBN: (纸本)9781538676424

This paper addresses the problem of road traffic congestion detection. We propose an effective approach to detect traffic congestion by combining the piecewise switched linear traffic (PWSL) and Shewhart control scheme. This approach uses PWSL model to describe the evolution of traffic density, and Shewhart chart to detect traffic congestions based on residuals obtained from PWSL model. The PWSL-Shewhart approach is evaluated using traffic data from the four-lane State Route 60 (SR-60) freeway in California. Results indicate that our approach accomplished reliable detection of traffic congestion.

关键词： Roads Monitoring Control charts Computational modeling Data models Control engineering

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Fast Characterization of System Level ESD Noise Coupling to Real Motherboard in Notebook

Fast Characterization of System Level ESD Noise Coupling to ...

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International Symposium on Electromagnetic Compatibility

作者： J. Yousaf J. Han H. Lee W. Nah J. Youn S. Mun D. Lee C. Hwang Department of Electrical and Computer Engineering Sungkyunkwan University Suwon Republic of Korea Design Technology Team Memory Division Samsung Electronics Co. Ltd Hwaseong Republic of korea

This work presents a method for the fast and efficient characterization of the system level electrostatic discharge (ESD) noise coupling to real portable computer (note-book) motherboard. The coupled noise to the commercial laptop motherboard, in both operational and non-operational conditions, is predicted in SPICE type circuit simulator using the derived coupling transfer impedance function from scattering (S) parameters. 8-parameters between the aggressor and victim positions are measured using the proposed different method, without any modification in ESD generator, for the calculation of the coupling transfer impedance function. A good degree of accuracy is observed between the time domain measured and simulated results using proposed method.

关键词： Electrostatic Discharge (ESD) IEC 61000-4-2 Coupling Transfer Function S-Parameters

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Analysis of Antenna Performance Degradation due to VCO Source Using Active S-Parameters

Analysis of Antenna Performance Degradation due to VCO Sourc...

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International Symposium on Electromagnetic Compatibility

作者： Hosang Lee Jawad Yousaf Jeongeun Kim Wansoo Nah Jinsung Youn Daehee Lee Chanseok Hwang Department of Electrical and Computer Engineering Sungkyunkwan University Suwon Republic of Korea Design Technology Team Memory Division Samsung Electronics Co. Ltd Hwaseong Republic of Korea

This paper proposes a method to analyze antenna performance degradation due to electromagnetic interference (EMI) between an antenna and a noise source using active scattering (S) parameters. The victim is a printed planar inverted-F antenna (PIFA) and the noise source over the victim is high frequency signals coming from a voltage controlled oscillator (VCO) via a loop shaped transmission line. Operating the VCO distorts the return loss of nearby antenna, which results in the degradation of the antenna performance. The excitation power of noise source was measured by probing the power of veo circuit, and were used for the input in the active S -parameters calculations. The validity of the proposed method was confirmed by the good agreement between the simulated and measured results.

关键词： Electromagnetic interference (EMI) Active scattering parameters (S-Parameters) Antenna performance degradation Noise source modeling Probing measurement Planar inverted-F antenna Voltage Controlled Oscillator (VCO)

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Using Auxiliary Loss to Improve Sleep Arousal Detection With Neural Network

Using Auxiliary Loss to Improve Sleep Arousal Detection With...

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computers in Cardiology (CinC)

作者： Bálint Varga Márton Görög Péter Hajas Department of Telecommunications Brno University of Technology Brno Czech Republic Computer Electrical and Mathematical Sciences & Engineering Division King Abdullah University of Science and Technology Thuwal Saudi Arabia

ISBN: (纸本)9781728109244

Our pipeline consists of a hand-crafted preprocessor and a neural network classifier. We applied transformations on the physiologic signals to gain features in both time- and frequency domains. The proposed algorithm was trained on 994 annotated records of polysomnographic signals. Most of the features were generated from the EEG signal such as power spectral density, and entropy. We extracted features from the EOG, EMG, airflow, and ECG signals too. All the features were normalized. These 68 features were resampled in 21 non-continuous moments around the current timestamp, and fed into a 3-layer neural network in order to assign a probability of arousal at each second. Arousal samples were enriched during training to battle data imbalance. Additional (auxiliary) losses can guide the network to learn high-level concepts, even though they will not be evaluated. We used sleep stages as additional training targets, which were easier to learn than arousals despite being multi-class. This approach slightly increased arousal AUPRC. Our submitted results for the entire test set were evaluated: AUPRC=0.42. Our 10-fold cross validation results for the AUPRC are the following: [0.47110, 0.41672, 0.44305, 0.42842, 0.44644, 0.47969, 0.45082, 0.49320, 0.45913, 0.41278] averaging 0.450.

关键词： Feature extraction Neural networks Training Sleep Electroencephalography Microsoft Windows Frequency-domain analysis

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Perturbation Analysis: A Framework for Data-Driven Control and Optimization of Discrete Event and Hybrid Systems

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IFAC-PapersOnLine 2017年第1期50卷 3028-3038页

作者： Wardi Y. Cassandras C.G. Cao X.R. School of Electrical and Computer Engineering Georgia Institute of Technology 777 Atlantic Drive Atlanta GA 30332 United States Division of Systems Engineering Department of Electrical and Computer Engineering Boston University 8 St. Mary's Street Boston MA 02215 United States Antai College of Economics and Management School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University 1954 Huashan Road Shanghai 200030 China

The history of Perturbation Analysis (PA) is intimately related to that of Discrete Event Dynamic Systems (DEDS), starting with a solution of a long-standing problem in the late 1970s and continuing today with the control and optimization of Hybrid Systems and the emergence of event-driven control methods. We review the origins of the PA theory and how it became part of a broader framework for models, control and optimization of DEDS. We then discuss the theoretical underpinnings of Infinitesimal Perturbation Analysis (IPA) as a data-driven stochastic gradient estimation method and how it has been applied over the past few decades. We explain how IPA offers a basis for general-purpose stochastic optimization of Markov systems through the notion of the performance potential and how it has evolved beyond DEDS and now provides a framework for control and optimization of Hybrid Systems and, more generally, event-driven methodologies. © 2017

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