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IEEE Open Journal of Antennas and Propagation 2025年第3期6卷 928-940页

作者： Tyndall, Will Reda, Alex Shaw, J. Richard Bandura, Kevin Chakraborty, Arnab Halpern, Mark Harris, Maile Kuhn, Emily MacEachern, Joshua Mena-Parra, Juan Newburgh, Laura Ordog, Anna Pinsonneault-Marotte, Tristan Polish, Anna Rose Saliwanchik, Ben Sanghavi, Pranav Siegel, Seth R. Whitmer, Audrey Wulf, Dallas Yale University Department of Physics New HavenCT06511 United States McGill University Department of Physics MontrealQC Canada McGill University Trottier Space Institute MontrealQC Canada University of British Columbia Department of Physics and Astronomy VancouverBC Canada West Virginia University Department of Computer Science and Electrical Engineering MorgantownWV United States West Virginia University Center for Gravitational Waves and Cosmology MorgantownWV United States Johns Hopkins University Applied Physics Laboratory LaurelMD United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States University of Toronto Dunlap Institute for Astronomy and Astrophysics TorontoON Canada David A. Dunlap Department of Astronomy and Astrophysics University of Toronto TorontoON Canada Department of Computer Science Math Physics and Statistics University of British Columbia Okanagan Campus KelownaBC Canada Dominion Radio Astrophysical Observatory Herzberg Astronomy and Astrophysics Research Center National Research Council Canada PentictonBC Canada Center for Astrophysics Harvard and Smithsonian CambridgeMA02138 United States Brookhaven National Laboratory Instrumentation Division UptonNY11973 United States Perimeter Institute for Theoretical Physics WaterlooON Canada

We present beam measurements of the CHIME telescope using a radio calibration source deployed on a drone payload. During test flights, the pulsing calibration source and the telescope were synchronized to GPS time, enabling in-situ background subtraction for the full N2 visibility matrix for one CHIME cylindrical reflector. We use the autocorrelation products to estimate the primary beam width and centroid location, and compare these quantities to solar transit measurements and holographic measurements where they overlap on the sky. We find that the drone, solar, and holography data have similar beam parameter evolution across frequency and both spatial coordinates. This paper presents the first drone-based beam measurement of a large cylindrical radio interferometer. Furthermore, the unique analysis and instrumentation described in this paper lays the foundation for near-field measurements of experiments like CHIME. © 2020 IEEE.

关键词： Drones

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Optimum control of a five-phase integrated modular permanent magnet motor under normal and open-circuit fault conditions

Optimum control of a five-phase integrated modular permanent...

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PESC 07 - IEEE 38th Annual Power Electronics Specialists Conference

作者： Dwari, Suman Parsa, Leila Lipo, Thomas A. Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 United States Department of Electrical and Computer Engineering University of Wisconsin - Madison Madison WI 53706 United States

ISBN: (纸本)1424406552

This paper presents optimal control of a five-phase Integrated Modular Permanent Magnet Motor for normal and open-circuit fault conditions. Finite element analysis of the motor is carried out to obtain output torque of the motor. It is found that the output torque ripple of the machine when supplied with sinusoidal currents is considerably high. An optimum control technique is presented to operate the machine with minimum torque ripple and least stator ohmic loss. Furthermore, an optimum fault tolerant control method under open-circuit fault conditions is presented. Due to the half bridge and split capacitor configuration used for this modular motor drive the neutral voltage fluctuates considerably during the fault condition. To solve this problem, a constraint to make the summation of the phase currents to zero is incorporated in the derivation of the fault tolerant optimal control strategy. Optimal currents are calculated for normal and open-circuit fault-tolerant operation of the machine. Simulation results are presented for the verification of the control methods. Although the control techniques discussed in this work are applied for the five phase modular permanent magnet machine, they can be extended for multiphase permanent magnet machines with any number of phases. © 2007 IEEE.

关键词： Timing circuits

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Distributed Real-time State Estimation for Combined Heat and Power systems

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Journal of Modern Power systems and Clean Energy 2021年第2期9卷 316-327页

作者： Tingting Zhang Wen Zhang Qi Zhao Yaxin Du Jian Chen Junbo Zhao the Key Laboratory of Power System Intelligent Dispatch and Control Ministry of EducationShandong UniversityJinan 250061China the Department of Electrical and Computer Engineering Mississippi State UniversityStarkvilleMS 39762USA

This paper proposes a distributed real-time state estimation(RTSE)method for the combined heat and power systems(CHPSs).First,a difference-based model for the heat system is established considering the dynamics of heat *** heat system model is further used along with the power system steady-state model for holistic CHPS state estimation.A cubature Kalman filter(CKF)-based RTSE is developed to deal with the system nonlinearity while integrating both the historical and present measurement ***,a multi-timescale asynchronous distributed computation scheme is designed to enhance the scalability of the proposed method for largescale *** distributed implementation requires only a small amount of information exchange and thus protects the privacy of different energy *** carried out on two CHPSs show that the proposed method can significantly improve the estimation efficiency of CHPS without loss of accuracy compared with other existing models and methods.

关键词： Combined heat and power system(CHPS) cubature Kalman filter(CKF) heat dynamics multi-time-scale asynchronous distributed scheme real-time state estimation(RTSE)

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Depth estimation for deformable object using a multi-layer neural network

Depth estimation for deformable object using a multi-layer n...

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IEEE International Conference on Real-time Computing and Robotics (RCAR)

作者： Zhu, Hangwei Wang, Hesheng Chen, Weidong Wu, Ruimin Hybrid Control Systems Group Department of Electrical and Computer Engineering Technische Universität München Munich Germany

ISBN: (纸本)9781538620359

Depth estimation plays a significant role in computer vision field. It helps comprehending the 3D characteristics of an object and the surroundings. For the depth estimation that uses stereo cues and multiple images, the local information of object suffices. While for the monocular cues, both global and local information are needed to estimate the depth of object. The relationship between the features of object and depth is highly non-linear and great uncertainty happens when the target object is deformed. In this paper, we present a new method that estimates the depth of the object by constructing a multi-layer neural network. By entering to the multi-layer neural network a group of key-points characteristics extracted from the target object and comparing the output with the point cloud data which is obtained by a Kinect, we get the trained multi-layer neural network that has the ability to estimate the depth. A feature extractor is designed by combining SIFT and RANSAC to extract the key-points that distribute in most part of the object which is necessary for establishing the correspondence between the model image and the image to be detected. Experiments were conducted to demonstrate the validity and stability of our method.

关键词： Feature extraction Estimation Neurons Multi-layer neural network Mathematical model Three-dimensional displays Data mining

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SUM: Spectrum utilization maximization in energy-constrained cooperative cognitive radio networks

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IEEE Journal on Selected Areas in Communications 2014年第11期32卷 2105-2116页

作者： Long, Yan Li, Hongyan Yue, Hao Pan, Miao Fang, Yuguang State Key Laboratory of Integrated Services Networks Xidian University Xi'an China Department of Electrical and Computer Engineering University of Florida FloridaFL United States Department of Computer Science Texas Southern University TX United States

Cooperative cognitive radio networks (CCRNs) enable secondary users (SUs) to access primary resource by cooperation with active primary users (PUs). For the cooperation-generated resource, existing schemes in CCRNs allocate the resource only to the relay SUs. However, this may lead to inefficient spectrum utilization, when the relay SUs have poor channel condition or little traffic load for their own secondary transmissions. In this paper, considering user diversity in secondary networks, we focus on network-level throughput optimization for secondary networks, by allowing all SUs to optimally share the cooperation-generated period. Besides, considering the energy constraint on SUs, we formulate the resource allocation problem from long-term perspective, to reflect the time-varying change of user diversity in channel condition, traffic load and energy amount. We present an online SUM scheme to solve the long-term optimization problem. Although a mixed-integer and non-convex problem is involved in the SUM scheme, we transform the problem into multiple convex subproblems, and then optimally solve it with low computational complexity. Extensive simulations show that the proposed SUM scheme significantly outperforms the existing schemes. © 2014 IEEE.

关键词： Energy utilization

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Tunneling devices and applications in high functionality/speed digital circuits

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SOLID-STATE ELECTRONICS 1997年第10期41卷 1515-1524页

作者： Haddad, GI Mazumder, P Center for High Frequency Microelectronics Solid State Electronics Laboratory Electrical Engineering and Computer Science Department University of Michigan Ann Arbor MI 48 U.S.A.

Tunneling phenomena can be used to realize devices with unique IT-V characteristics (negative differential resistance) which can be employed to design various types of digital circuits with a significantly lower number of transistors, extremely fast switching speeds, very low power consumption and pipelining capability at the basic gate level (nanopipelining) which results in higher system throughput. In this article, we will present the basic properties of various types of devices which have been proposed for these applications including resonant tunneling diodes (RTDs), Esaki tunnel diodes (ETDs), and various types of transistors including resonant hot electron transistors (RHETs) and tuaneling bipolar transistors (TBTs). We will also compare the anticipated performance of various types of logic gates and digital circuit implementations utilizing these devices with conventional CMOS circuits. (C) 1997 Elsevier Science Ltd.

关键词： Digital circuits

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The frequency-domain TLM method - Theory and applications

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ELECTROMAGNETICS 1996年第5期16卷 591-609页

作者： Vahldieck, R Chen, S Huang, J Jin, H Laboratory for Lightwave Electronics Microwaves and Communications (LLiMiC) Department of Electrical and Computer Engineering University of Victoria Victoria BC V8W3P6 Canada

This paper reviews the basic concept of the frequency-domain TLM method. Various formulations for the frequency-domain nodes are derived from the symmetrical condensed node. It will be shown that different node representations lead to different dispersion errors which in turn will have a direct effect on the computational accuracy. The flexibility and potential of the FDTLM method will be discussed and a wide range of applications will illustrate the usefullness of this approach.

关键词： Electromagnetic field theory

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Wafer-scale integration of freestanding photonic devices with color centers in silicon carbide

npj Nanophotonics

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npj Nanophotonics 2025年第1期2卷 1-7页

作者： Sridhar Majety Victoria A. Norman Pranta Saha Alex H. Rubin Marina Radulaski Scott Dhuey Department of Electrical and Computer Engineering University of California Davis CA 95616 USA Department of Physics and Astronomy University of California Davis CA 95616 USA The Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Color center platforms have been at the forefront of quantum nanophotonics for applications in quantum networking, computing, and sensing. However, large-scale deployment of this technology has been stifled by a lack of ability to integrate photonic devices at scale while maintaining the properties of quantum emitters. We address this challenge in silicon carbide, which has both commercially available wafer-scale substrates and is a host to color centers with desirable optical and spin properties. Using ion beam etching at an angle, we develop a 5-inch wafer process for the fabrication of triangular cross-section photonic devices in bulk 4H-SiC. The developed process has a variability in etch rate and etch angle of 5.4% and 2.9%, respectively. Furthermore, the integrated color centers maintain their optical properties after the etch, thus achieving the nanofabrication goal of wafer-scale nanofabrication in quantum-grade silicon carbide.

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A sensitivity study of the clustering approach to workload modeling 85

A sensitivity study of the clustering approach to workload m...

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1985 ACM SIGMETRICS Conference on Measurement and Modeling of computer systems, SIGMETRICS 1985

作者： Caluarossat, Maria Ferrari, Domenico Computer Science Division Department of Electrical Engineering and Computer Sciences Electronics Research Laboratory University of California Berkeley United States

ISBN: (纸本)0897911695

In a paper published in 1984 [Ferr84], the validity of applying clustering techniques to the design of an executable model for an interactive workload was discussed. The following assumptions, intended not to be necessarily realistic but to provide sufficient conditions for the applicability of clustering techniques, were made:The system whose workload is to be modeled is an interactive system, and its performance can be accurately evaluated by solving a product-form closed queueing network *** behavior of each interactive user can be adequately modeled by a probabilistic graph (called a user behavior graph); in such a graph, each node represents an interactive command type, and the duration of a user's stay in the node probabilistically equals the time the user spends typing in a command of that type, waiting for the system's response, and thinking about what command should be input *** interactive workload to be modeled is stationary, and the workload model to be constructed is intended to reproduce its global characteristics (not those of some brief excerpt from it exhibiting peculiar dynamics), hence to be stationary as *** was shown in [Ferr84] that, under these assumptions, clustering command types having the same probabilistic resource demands does not affect the values of the performance indices the evaluators are usually interested in, provided the visit ratio to each node in the reduced (i.e., post-clustering) user behavior graph is equal to the sum of the visit ratios the cluster's components had in the original *** the reduction we have just described is equivalent to replacing each cluster with one or more representatives of its components, and since this is also the goal of applying clustering techniques to the construction of executable workload models substantially more compact than the original workload to be modeled, this result shows that such techniques are valid (i.e., produce accurate models) when the assumptions and the

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A soft error mitigation scheme for safety-critical computer systems

A soft error mitigation scheme for safety-critical computer ...

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Annual Reliability and Maintainability Symposium, 2005 Proceedings: The International Symposium on Product Quality and Integrity

作者： Yu, Yangyang Johnson, Barry W. University of Virginia Department of Electrical and Computer Engineering University of Virginia 351 McCormick Road Charlottesville VA 22904 United States Department of Electrical and Computer Engineering University of Virginia Department of Electrical and Computer Engineering University of Virginia Charlottesville VA 22904 United States Center for Safety-Critical Systems

ISBN: (纸本)0780388240

Advances in VLSI technology have reduced circuit dimensions and improved processor performance dramatically, yet these advances are offset by an increased vulnerability of soft error, which are caused by alpha particles and cosmic rays that bombard the earth. This problem, concerning in the past more often parts used in space, affects integrated circuit (IC) at sea level. This challenging problem has to be solved otherwise technological progress will be blocked soon. All of the potential soft error mitigation methods may require that either additional hardware or software be added to the system design. The simplest method of mitigating errors in memory/data stream is to employ information redundancy as the mitigation scheme. For a modest overhead, an error detection and correction code can be applied on large main memories and cache arrays to virtually eliminate the problem of cell upset. In this paper, two most commonly used error detection and correction codes, the parity check code and the Hamming code, are compared in order to achieve high reliability and safety for the memory word-line design of safety-critical applications. © 2005 IEEE.

关键词： computer systems

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