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IEEE International Conference on Robotics and Automation (ICRA)

作者： Daniel J. Gonzalez H. Harry Asada Robotics Research Center in the Department of Electrical Engineering and Computer Science United States Military Academy West Point NY USA d’Arbeloff Laboratory for Information Systems and Technology in the Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA USA

ISBN: (数字)9781728173955

ISBN: (纸本)9781728173962

The Extra Robotic Legs (XRL) system is a robotic augmentation worn by a human operator consisting of two articulated robot legs that walk with the operator and help bear a heavy backpack payload. It is desirable for the Human-XRL quadruped system to walk with the rear legs lead the front by 25% of the gait period, minimizing the energy lost from foot impacts while maximizing balance stability. Unlike quadrupedal robots, the XRL cannot command the human's limbs to coordinate quadrupedal locomotion. Using a pair of Rimless Wheel models, it is shown that the systems coupled with a spring and damper converge to the desired 25% phase difference. A Poincaré return map was generated using numerical simulation to examine the convergence properties to different coupler design parameters, and initial conditions. The Dynamically Coupled Double Rimless Wheel system was physically realized with a spring and dashpot chosen from the theoretical results, and initial experiments indicate that the desired synchronization properties may be achieved within several steps using this set of passive components alone.

关键词： Legged locomotion Wheels Synchronization Couplers Robot kinematics

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Low-Power Envelope Detector for WSN Wake-up Receiver Applications

Low-Power Envelope Detector for WSN Wake-up Receiver Applica...

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IEEE International Conference on Design & Test of Integrated Micro & Nano-systems (DTS)

作者： Mariem Bouraoui Amel Neifar Imen Barraj Mohamed Masmoudi Electrical Engineering Department Systems Integration and Emerging Energies Laboratory National Engineers School of Sfax University of Sfax Sfax Tunisia National Engineers School of Gabes University of Gabes Tunisia Department of Computer Engineering College of Computer Engineering and Sciences Prince Sattam Bin Abdulaziz University Al-Kharj Saudi Arabia

This paper highlights the importance of the wake-up receiver in applications using WSN while offering a brief description of this element. In this work, the design of a low-power envelope detector for wake-up receiver applications is presented. By using RF-TSMC CMOS 0.18μm, the proposed envelope circuit is designed for 52 GHz frequency. The forward body biasing method is employed to decrease the circuit energy consumption. The proposed circuit can achieve 152MHz cut-off frequency over the operating frequency range and has power dissipation of 87.5μW under 1V.

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Single-Phase and Two-Phase Liquid Immersion Cooling of Data Center Power Supply Units for Heat Capture

Single-Phase and Two-Phase Liquid Immersion Cooling of Data ...

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Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic systems (ITHERM)

作者： Haoyun Qiu Pouya Kabirzadeh Vivek S. Garimella Arjit Bali Keerthivasan Gurusami Kang Joon Lee Andrew Stillwell Todd Salamon Nenad Miljkovic Department of Mechanical Science and Engineering University of Illinois Urbana-Champaign Urbana IL Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL Optical Systems and Device Research Laboratory Nokia Bell Labs Murray Hill NJ

ISBN: (数字)9798350364330

ISBN: (纸本)9798350364347

Data center power supply units (PSU) have high power density due to the increasing power demand and their low profiles. Air cooling proves to be increasingly difficult in mitigating the hot spots, and it also consumes extra energy in fluid delivery, air conditioning, and rejection to the ambience. In this work, we redesign and modify the PSU cooling infrastructure and adopt quiescent immersion cooling. This design removes all active air-cooling elements and enables heat capture. The PSU used in the experiments is a 2 kW 80 Plus Platinum commercial unit (Bel PET2000-12-074RA). The cooling performance was characterized by tracking the steady-state case temperatures of the switching semiconductors. Flutec PP1 was used to study the cooling performance variations with respect to PSU load and capture temperature. Conventional fan-cooled PSU with heat sinks served as the benchmark. Experiments show that two-phase immersion cooling grants an overall enhancement of 4.4× over the original air-cooling approach at 40 °C heat capture. The results suggest that heat rejection from the dielectric fluid to the riding heatsink is the main bottleneck, and further reduction of the thermal resistance would allow heat capture at a temperature closer to the liquid boiling point. The PSU thermal management approach studied here can help lower data center power usage effectiveness (PUE) while increasing PSU power delivery density.

关键词： Power system measurements Cooling Density measurement Thermal resistance Thermomechanical processes Immersion cooling Switches Thermal management Resistance heating Data center power

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Blood Coagulation and Living Tissue Sterilization by Floating-Electrode Dielectric Barrier Discharge in Air

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Plasma Chemistry and Plasma Processing 2006年第1期27卷 113-114页

作者： Gregory Fridman Marie Peddinghaus Manjula Balasubramanian Halim Ayan Alexander Fridman Alexander Gutsol Ari Brooks Gary Friedman School of Biomedical Engineering Science and Health Systems Drexel University Philadelphia USA Pathology and Laboratory Medicine Department College of Medicine Drexel University Philadelphia USA Department of Mechanical Engineering and Mechanics College of Engineering Drexel University Philadelphia USA Department of Surgery College of Medicine Drexel University Philadelphia USA Department of Electrical and Computer Engineering College of Engineering College of Engineering Drexel University Philadelphia USA

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Electro-Thermal Co-Design of a Cooling System-Integrated High-Frequency Transformer

Electro-Thermal Co-Design of a Cooling System-Integrated Hig...

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IEEE Transportation Electrification Conference and Expo (ITEC)

作者： Yongwan Park Sevket Yuruker Shiladri Chakraborty Alireza Khaligh Raphael Mandel Patrick McCluskey Michael Ohadi Lauren Boteler Miguel Hinojosa Department of Electrical and Computer Engineering The Institute for Systems Research University of Maryland College Park MD USA Department of Mechanical Engineering University of Maryland College Park MD USA U.S. Army Research Laboratory Adelphi MD USA

ISBN: (数字)9781728146294

ISBN: (纸本)9781728146300

This paper presents electro-thermal design optimization of a high-frequency planar transformer with an integrated thermal management system involving a liquid-cooled chamber for combined core and winding cooling. The designed transformer is for a 10 kW, 600V to 800 V, 1 MHz dual-active-bridge converter, working as the dc-dc stage of high power-density on-board electric vehicle chargers. Effect of design variables like number of turns of the transformer and cooler height on the transformer's electrical parameters such as leakage inductance, ac resistance and parasitic capacitance is estimated. The dependence of converter efficiency on these parameters is estimated using simulations and analyses and potential trade-offs of the design are investigated. Similarly, thermal modeling is used to characterize the thermal performance of different designs, evaluated on the basis of the required coolant temperature to maintain the transformer winding and core at a specified temperature. Based on a combination of the preceding analyses, optimal designs are identified which simultaneously ensure good electrical and thermal performance.

关键词： Windings Transformer cores Capacitance Inductance Cooling Thermal management Mathematical model

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Optical data transmission using inverse-designed silicon multimode photonic circuits and spectrally flattened microcombs

Optical data transmission using inverse-designed silicon mul...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Yang, K.Y. Shirpurkar, C. White, A.D. Zang, J. Chang, L. Ashtiani, F. Guidry, M.A. Lukin, D.M. Pericherla, S.V. Yang, J. Kwon, H. Lu, J. Ahn, G.H. Van Gasse, K. Jin, Y. Yu, S.-P. Briles, T.C. Stone, J.R. Carlson, D.R. Song, H. Zou, K. Zhou, H. Pang, K. Hao, H. Trask, L. Li, M. Netherton, A. Rechtman, L. Stone, J.S. Skarda, J.L. Su, L. Vercruysse, D. MacLean, J.P.W. Aghaeimeibodi, S. Li, M.-J. Miller, D.A.B. Marom, D.M. Willner, A.E. Bowers, J.E. Papp, S.B. Delfyett, P.J. Aflatouni, F. Vučković, J. E.L.Ginzton Laboratory Stanford University StanfordCA United States John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA United States The College of Optics and Photonics University of Central Florida OrlandoFL United States Time and Frequency Division National Institute of Standards and Technology BoulderCO United States Department of Physics University of Colorado BoulderCO United States Department of Electrical and Computer Engineering University of California Santa BarbaraCA United States Department of Electrical and Systems Engineering University of Pennsylvania PhiladelphiaPA United States SPINS Photonics Incorporated HollisterCA United States Octave Photonics LouisvilleCO United States Department of Electrical and Computer Engineering University of Southern California Los AngelesCA United States Applied Physics Department The Hebrew University of Jerusalem Jerusalem Israel Corning Incorporated CorningNY United States

We demonstrate a 1.12-Tbps error-free data transmission throughout inverse-designed multimode photonic circuits using spectrally flattened microcombs as a multiwavelength laser source. © Optica Publishing Group 2... 详细信息

ISBN: (纸本)9781957171258

关键词： Timing circuits

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Regularized fourier ptychography using an online plug-and-play algorithm

arXiv

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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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T/R module development for large aperture L-band phased array

T/R module development for large aperture L-band phased arra...

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IEEE Conference on Aerospace

作者： N. Chamberlain C. Andricos A. Berkun K. Kumley V. Krimskiy R. Hodges S. Spitz Jet Propulsion Laboratory California Institute of Technology Flight Communications Systems Pasadena CA USA Electrical and Computer Engineering Department South Dakota School of Mines and Technology Rapid City SD USA

This paper describes a transmit/receive (T/R) module for a large L-band space based radar active phased array being developed at JPL. electrical performance and construction techniques are described, with emphasis on the former. The T/R modules have a bandwidth of more than 80 MHz centered at 1260 MHz and support dual, switched polarizations. Phase and amplitude are controlled by a 6-bit phase shifter and a 6-bit attenuator, respectively. The transmitter power amplifier generates 2.4 W into a nominal 50 ohm load with 36% overall efficiency. The receiver noise figure is 4.4 dB including all front-end losses. The module weighs 32 g and has a footprint of 10.6 cm /spl times/ 4.8 cm. Fourteen of these T/R modules were fabricated at the JPL pick-and-place facility and were tested using a computer-controlled measurement facility developed at JPL. Calibrated performance of this set of T/R modules is presented and shows good agreement with design predictions.

关键词： Phased arrays Apertures L-band Spaceborne radar Bandwidth Polarization Phase shifters Attenuators Transmitters Power amplifiers

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Towards an ontology for autonomous robots

Towards an ontology for autonomous robots

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25th IEEE/RSJ International Conference on Robotics and Intelligent systems, IROS 2012

作者： Paull, Liam Severac, Gaetan Raffo, Guilherme V. Angel, Julian Mauricio Boley, Harold Durst, Phillip J. Gray, Wendell Habib, Maki Nguyen, Bao Ragavan, S. Veera Saeedi G., Sajad Sanz, Ricardo Seto, Mae Stefanovski, Aleksandar Trentini, Michael Li, Howard COBRA Department of Electrical and Computer Engineering University of New Brunswick Fredericton NB E3B 5A3 Canada ONERA-University of Toulouse France Department of Automation and Systems Federal University of Santa Catarina Brazil Department of Computer Engineering Pontificia Universidad Javeriana Bogot Colombia National Research Council Canada US Army ERDC 3909 Halls Ferry Road Vicksburg MS 39180 United States Mechanical Engineering Department School of Sciences and Engineering American University in Cairo New Cairo Egypt Defence Research and Development Canada-CORA Ottawa ON Canada Monash University Sunway Campus Australia Systems Engineering and Automatic Control Autonomous Systems Laboratory Research Group Universidad Politcnica de Madrid Madrid Spain Defence Research and Development Canada-Atlantic Dartmouth NS Canada Department of Computer Science George Washington University United States Defence R and D Canada-Suffield PO Box 4000 Station Main Medicine Hat AB T1A 8K6 Canada

ISBN: (纸本)9781467317375

The IEEE RAS Ontologies for Robotics and Automation Working Group is dedicated to developing a methodology for knowledge representation and reasoning in robotics and automation. As part of this working group, the Autonomous Robots sub-group is tasked with developing ontology modules for autonomous robots. This paper describes the work in progress on the development of ontologies for autonomous systems. For autonomous systems, the focus is on the cooperation, coordination, and communication of multiple unmanned aerial vehicles (UAVs), unmanned ground vehicles (UGVs), and autonomous underwater vehicles (AUVs). The ontologies serve as a framework for working out concepts of employment with multiple vehicles for a variety of operational scenarios with emphasis on collaborative and cooperative missions. © 2012 IEEE.

关键词： Ontology

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Application of TINA-C computing and service architecture concepts to the development of an advanced information brokerage service in the context of EC

Application of TINA-C computing and service architecture con...

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Proceedings of the Global Convergence of Telecommunications and Distributed Object Computing (TINA)

作者： J.I. Asensio J.I. Moreno V.A. Villagra J. Redondo A. Nolle I. Tothezan G.T. Karetsos Department of Telematic Systems Engineering Technical University of Madrid Spain France Télécom CNET France SEMA GROUP TELIS Telecom France Telecommunications Laboratory Department of Electrical Engineering & Computer Science National and Technical University of Athens Greece

The concept of electronic brokerage is based on the use of new information technologies so as to provide a service capable of facilitating and organising the relationship between the supply and the demand in an "electronic marketplace" environment. This new service supported by the so-called "electronic brokers", will allow service providers to publish and advertise their offers and, at the same time, will help end users to access the offered services and information in an easy and efficient way. The paper presents an architecture for this electronic brokerage service that is currently being developed within the scope of the ABS (Architecture for Information Brokerage Service) ACTS European project. This architecture is based on concepts and principles contained in the TINA-C computing and service architecture and in the OMG EC-DTF Reference Model.

关键词： computer applications computer architecture Telecommunications Electronic commerce Context-aware services Ice electrical capacitance tomography Distributed processing Telematics systems engineering and theory

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