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IEEE International Frequency Control Symposium

作者： Olukayode Okusaga Justin Pritchett Ryan Sorenson Weimin Zhou Morris Berman James Cahill Gary M. Carter Curtis R. Menyuk Sensors and Electronic Devices Division U.S. Army Research Laboratory Adelphi MD U.S.A. Computer Science and Electrical Engineering Department University of Maryland Baltimore County Baltimore MD U.S.A.

The optoelectronic oscillator (OEO) is a radio-frequency (RF) source that utilizes lengths of optical fiber in a ring resonator to create low-phase-noise signals. In this work, we demonstrate a novel fiber-optic acoustic sensor by measuring the modulation sidebands induced on the OEO's RF signal by an acoustic tone impinging on the fiber spool in the OEO. The narrow linewidth and high oscillating frequency of the OEO results in a sensor with both high signal-to-noise ratios and high spectral resolution.

关键词： Optical fibers Optical fiber sensors Optical interferometry Frequency modulation Radio frequency

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Optimization of a z-source DC circuit breaker

Optimization of a z-source DC circuit breaker

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IEEE Electric Ship Technologies Symposium, ESTS

作者： P. Prempraneerach M. G. Angle J. L. Kirtley G. E. Karniadakis C. Chryssostomidis Mechanical Engineering Department Rajamangala University of Technology Thunyaburi Pathumthani Thailand Electrical Engineering and Computer Science Department Research Laboratory for Electronics MIT Cambridge MA USA Division of Applied Mathematics Brown University Providence RI USA Department of Mechanical Engineering MIT MIT Sea Grant College Program Cambridge MA USA

DC faults may cause severe disruptions in continuity of service to vital loads in a shipboard integrated power system, hence detection, isolation, and protection against such faults must be incorporated in both medium-voltage DC (MVDC) and low-voltage DC (LVDC) systems. Here we consider the effectiveness of existing z-source breakers and propose several new designs more appropriate for fault detection in MVDC and LVDC systems. In particular, we perform an optimization study that aims to minimize dissipation and weight and we identify the key parameters for use in MVDC and LVDC systems. Preliminary verification and validation studies are also included.

关键词： Circuit faults Thyristors Switches Circuit breakers Capacitors Fault currents Optimization

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The situated HKB model: How sensorimotor spatial coupling can alter oscillatory brain dynamics

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Frontiers in Computational Neuroscience 2013年第JUL期7卷 117页

作者： Aguilera, Miguel Bedia, Manuel G. Santos, Bruno A. Barandiaran, Xabier E. Department of Computer Science and Engineering Systems University of Zaragoza Zaragoza Spain Department of Informatics CCNR University of Sussex Brighton United Kingdom Laboratory of Intelligent Systems Cefet-MG Belo Horizonte Brazil Department of Philosophy IAS-Research Centre for Life Mind and Society University School of Social Work UPV/EHU University of the Basque Country San Sebastián Spain

Despite the increase of both dynamic and embodied/situated approaches in cognitive science, there is still little research on how coordination dynamics under a closed sensorimotor loop might induce qualitatively different patterns of neural oscillations compared to those found in isolated systems. We take as a departure point the Haken-Kelso-Bunz (HKB) model, a generic model for dynamic coordination between two oscillatory components, which has proven useful for a vast range of applications in cognitive science and whose dynamical properties are well understood. In order to explore the properties of this model under closed sensorimotor conditions we present what we call the situated HKB model: a robotic model that performs a gradient climbing task and whose "brain" is modeled by the HKB equation. We solve the differential equations that define the agent-environment coupling for increasing values of the agent's sensitivity (sensor gain), finding different behavioral strategies. These results are compared with two different models: a decoupled HKB with no sensory input and a passively-coupled HKB that is also decoupled but receives a structured input generated by a situated agent. We can precisely quantify and qualitatively describe how the properties of the system, when studied in coupled conditions, radically change in a manner that cannot be deduced from the decoupled HKB models alone. We also present the notion of neurodynamic signature as the dynamic pattern that correlates with a specific behavior and we show how only a situated agent can display this signature compared to an agent that simply receives the exact same sensory input. To our knowledge, this is the first analytical solution of the HKB equation in a sensorimotor loop and qualitative and quantitative analytic comparison of spatially coupled vs. decoupled oscillatory controllers. Finally, we discuss the limitations and possible generalization of our model to contemporary neuroscience and philosophy of

关键词： Differential equations

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Metamaterial absorbers realized in an X-band rectangular waveguide

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Chinese Physics B 2012年第11期21卷 474-478页

作者：黄勇军文光俊李建钟靖平王平孙元华 O.Gordon 朱卫仁 Key Laboratory of Broadband Optical Fiber Transmission&Communication Networks School of Communication and Information EngineeringUniversity of Electronic Science and Technology of China Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems EngineeringMonash University

In this paper, we demonstrate six types of metamaterial absorbers （MMAs） by measuring their absorptivities in an X-band （8 12 GHz） rectangular waveguide. Some of the MMAs have been demonstrated previously by using the free space measurement method, and the others are proposed firstly in this paper. The measured results show that all of the six MMAs exhibit high absorptivities above 98%, which have similar absorbing characteristics to those measured in the free space. The numerically obtained surface current densities for each MMA show that the absorbing mechanism is the same as that under the free space conditions. Such a demonstration method is superior to the conventional free space measurement method due to the small-scale test samples required, the simple measure device, and its low cost. Most importantly, the proposed method opens a way to enable MMAs to be used in microwave applications such as matched terminations.

关键词： metamaterial absorber electric resonator rectangular waveguide

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Performance Analysis of Multi-Hop AF Relaying systems with a Poisson Field of Interferers in Nakagami-m Fading Channels

Performance Analysis of Multi-Hop AF Relaying Systems with a...

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IEEE Vehicular Technology Conference

作者： Valentine A. Aalo Kostas P. Peppas George Efthymoglou Mohammed Alwakeel Sami Alwakeel Department of Computer & Electrical Engineering and Computer Science Florida Atlantic University Boca Raton FL 33431 USA. Laboratory of Mobile Communications Institute of Informatics and Telecommunications National Centre for Scientific Research "Demokritos" Patriarhou Grigoriou & Neapoleos Agia Paraskevi 15310 Athens Greece. Department of Digital Systems University of Piraeus 80 Karaoli & Dimitriou Street Piraeus 18534 Greece. Sensor Networks and Cellular Systems (SNCS) Research Center University of Tabuk Tabuk Saudi Arabia. Department of Computer Engineering College of Computer and Information Sciences King Saud University Riyadh 11543 Saudi Arabia.

ISBN: (纸本)9781467361866

In this paper, we investigate the performance of multi-hop wireless networks with amplify-and-forward (AF) relaying operating in interference-limited environments. The analysis considers the presence of co-channel interferers that are scattered according to independent spatial Poisson point processes around the relays and the destination. Assuming that both the desired and the interfering signals experience Nakagami-m fading, exact expressions for the average bit error probability and the average channel capacity of the considered system are obtained as single integrals that can be reliably evaluated numerically. In addition, the diversity and coding gains per hop are obtained. The novel expressions can be used to show the impact of system and interference model parameters on the performance of multi-hop wireless systems. Simulation results are further provided to demonstrate the accuracy of the analytical expressions.

关键词： AF Possion Filed Nakagami-m Fading Channels air feed equipment ABER Spread spectrum communication relaying Channel capacity Sim'eon Denis Poisson coding gain Fading channels wireless multi-hop networks co-channel

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H_∞ filtering with Diagonal Interacting Multiple Model Algorithm for Maneuvering Target Tracking

H_∞ filtering with Diagonal Interacting Multiple Model Algo...

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American Control Conference

作者： X. Fu Y. Jia J. Du J. Zhang W. Li X. Liu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunication school of Electronic and Information Engineering Beihang University (BUAA) Department of Automatic Beijing Information and Science of University

ISBN: (纸本)9781479901777

This paper is devoted to the problem of state estimate of discrete-time stochastic systems with Markov jump parameters. A robust algorithm-diagonal interacting multiple model algorithm based on H_∞ filtering (DIMMH) is presented for maneuvering target tracking when measurement noise is of unknown statistics. Extensive Monte Carlo simulations show the effectiveness and superiority of the proposed algorithm.

关键词： Maneuvering Target Tracking Markov jump parameters effectiveness Target tracking maneuvering target State estimation Filtration tracking Noise measurement Diagonal Monte Carlo technique

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Subcranial magnetic stimulation: a novel method of focal, non-invasive deep brain neuromodulation for the treatment of post-traumatic stress disorder.

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Brain Stimulation 2014年第2期7卷 e15-e16页

作者： Jonathan R. Young Artem Rozkov Zhao Li Oliver Young Tim Barber Pascal Wallisch Stony Brook University School of Medicine Stony Brook NY 11790 USA Cognitive Neurophysiology Research Group Department of Neurology New York University School of Medicine New York NY 10016 USA NeuTx Research Group Stony Brook NY 11790 USA Department of Electrical and Computer Engineering Polytechnic Institute of New York University Brooklyn NY 11201 USA Computational Neuroimaging Laboratory Center for Neural Science Department of Psychology New York University New York NY 10003 USA

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High-energy sub-cycle optical waveform synthesizer

High-energy sub-cycle optical waveform synthesizer

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Advanced Solid State Lasers, ASSL 2013

作者： Kärtner, Franz X. Mücke, Oliver D. Cirmi, Giovanni Fang, Shaobo Chia, Shih-Hsuan Manzoni, Cristian Farinello, Paolo Cerullo, Giulio Center for Free-Electron Laser Science Deutsches Elektronen-Synchrotron DESY Notkestraße 85 22607 Hamburg Germany Physics Department University of Hamburg Luruper Chaussee 149 22761 Hamburg Germany The Hamburg Center for Ultrafast Imaging Luruper Chaussee 149 22761 Hamburg Germany Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States IFN-CNR Dipartimento di Fisica Politecnico di Milano Piazza Leonardo da Vinci 32 I-20133 Milan Italy

High-energy sub-cycle optical waveform synthesis is demonstrated with a three-channel OPA pumped by an 18-mJ cryogenically cooled Ti:sapphire laser. The system aims towards multimJ, 2-fs, phase-stable pulses covering ... 详细信息

ISBN: (纸本)9781557529824

关键词： Sapphire

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Focus issue on surface plasmon photonics introduction

Focus issue on surface plasmon photonics introduction

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作者： Berini, Pierre Bouhelier, Alexandre De Abajo, Javier Garcia Park, Namkyoo School of Electrical Engineering and Computer Science Department of Physics University of Ottawa Ottawa K1N 6N5 Canada Laboratoire Interdisciplinaire Carnot de Bourgogne UMR CNRS 6303 Université de Bourgogne 9 av. Alain Savary 21078 Dijon France Spain ICREA - Institució Catalana de Reserca i Estudis Avançats Barcelona Spain Photonic Systems Laboratory School of EECS Seoul National University Seoul 151-744 Korea Republic of

The 6th International Conference on Surface Plasmon Photonics (SPP6) was held in Ottawa, Canada from May 26th to 31st, 2013. This independent series of biennial conferences is widely regarded as the premier series in the field, and the 6th edition maintained the tradition of excellence. This Focus Issue collects several papers related to research presented at SPP6, and although the number of papers it comprises is small compared to the total number of papers presented at the conference, the issue is representative and provides a good snapshot of the field at this point in time. © 2013 Optical Society of America.

关键词： Surface plasmons

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High power Yb: Lu2O3 dual-crystal laser

High power Yb: Lu2O3 dual-crystal laser

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Advanced Solid State Lasers, ASSL 2013

作者： Calendron, Anne-Laure Lederer, Max J. Cankaya, Huseyin Beil, Kolja Kränkel, Christian Kaertner, Franz X. Center for Free-Electron Laser Science Deutsches Elektronen Synchrotron Notkestrasse 85 22607 Hamburg Germany The Hamburg Center for Ultrafast Imaging University of Hamburg Luruper Chaussee 149 22761 Hamburg Germany European X-Ray Free-Electron Laser-Facility GmbH Abert-Einstein-Ring 19 22761 Hamburg Germany Institute of Laser-Physics University of Hamburg Luruper Chaussee 149 22761 Hamburg Germany Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States

We present a dual-crystal Yb:Lu2O3 laser in CW and cavity-dumped regime. We obtained 19.5 W CW output power in a diffraction limited beam. When cavity-dumped, the output energy was limited to 3 mJ, owing to surface da... 详细信息

ISBN: (纸本)9781557529824

关键词： Lutetium compounds

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