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IEEE International Conference on Electro-Information Technology

作者： Nannan He Ying Qian Han-way Huang Dept. of Electrical and Computer Engineering Technology Minnesota State University at Mankato School of Computer Engineering Nanjing Institute of Technology China

ISBN: (纸本)9781467399869

This paper primarily presents our work of employing the BeagleBone Black board, a small but powerful single-board embedded computer, to enrich the teaching materials of embedded systems design for technology students. It introduces the hardware and software features of the BeagleBone Black. It then presents the learning outcomes, contents and lab organization. The comparison of the BBB with another commonly used single board computer Raspberry Pi is also discussed. Two developed Internet of Things (IoT) relevant capstone projects are reported. Our experiences demonstrate that BBB is an easy-to-use development board which can be employed by college-level students for developing complex embedded computing systems, especially targeting at network applications.

关键词： Internet of things computers Hardware Linux Sensors Software Universal Serial Bus

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Teaching touch sensing technologies through project-based learning

Teaching touch sensing technologies through project-based le...

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Frontiers in Education (FIE) Conference

作者： Nannan He Han-way Huang Ying Qian Dept. of Electrical and Computer Engineering Technology Minnesota State University Mankato School of Computer Engineering Nanjing Institute of Technology China

ISBN: (纸本)9781509017911

Compared with conventional keyboard and mouse systems, touch sensing input devices provide more accurate and direct interaction with the user. More and more touch devices appear in various domains. To keep up with this technology change, we have introduced touch sensing technologies to electrical and computer engineering technology students by using the project-based learning (PBL) approach. Our experiences indicate that the PBL approach is efficient and practical for teaching touch sensing techniques. Two different sets of courseware including hardware kits and software packages have been utilized in design projects to teach touch in two existing courses respectively. Students have shown the great interest and the capability in adopting touch devices into their senior embedded systems design projects to improve user interactions with the computing systems.

关键词： Sensors Education Microcontrollers computers Programming Libraries Capacitance

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Compressive phase retrieval via reweighted amplitude flow

arXiv

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arXiv 2017年

作者： Zhang, Liang Wang, Gang Giannakis, Georgios B. Chen, Jie Digital Technology Center Department of Electrical and Computer Engineering University of Minnesota MinneapolisMN55455 United States State Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing100081 China School of Automation State Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing Institute of Technology Beijing100081 China

The problem of reconstructing a sparse signal vector from magnitude-only measurements (a.k.a., compressive phase retrieval), emerges naturally in diverse applications, but it is NP-hard in general. Building on recent advances in nonconvex optimization, this paper puts forth a new algorithm that is termed compressive reweighted amplitude flow and abbreviated as CRAF, for compressive phase retrieval. Specifically, CRAF operates in two stages. The first stage seeks a sparse initial guess via a new spectral procedure. In the second stage, CRAF implements a few hard thresholding based iterations using reweighted gradients. When there are sufficient measurements, CRAF provably recovers the underlying signal vector exactly with high probability under suitable conditions. Moreover, its sample complexity coincides with that of the state-of-the-art procedures. Finally, substantial simulated tests showcase remarkable performance of the new spectral initialization, as well as improved exact recovery relative to competing alternatives. Copyright © 2017, The Authors. All rights reserved.

关键词： Iterative methods

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Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures

arXiv

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arXiv 2017年

作者： Choi, Chanyeol Huang, Jiahui Cheng, Hung-Chieh Kim, Hyunseok Vinod, Abhinav Kumar Bae, Sang-Hoon Özçelik, V. Ongun Grassi, Roberto Chae, Jongjae Huang, Shu-Wei Duan, Xiangfeng Kaasbjerg, Kristen Low, Tony Wong, Chee Wei Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of California Los AngelesCA90095 United States Department of Electrical Engineering University of California Los AngelesCA90095 United States Department of Materials Science and Engineering University of California Los AngelesCA90095 United States California Nanosystems Institute University of California Los AngelesCA90095 United States Andlinger Center for Energy and the Environment Princeton University PrincetonNJ08544 United States Department of Electrical and Computer Engineering University of Minnesota MinneapolisMN55455 United States Department of Chemistry and Biochemistry University of California Los AngelesCA90095 United States Technical University of Denmark Kgs. LyngbyDK-2800 Denmark Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Mechanical Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Electrical Computer and Energy Engineering University of Colorado Boulder BoulderCO80309 United States

Vertically stacked van der Waals heterostructures constitute a promising platform for providing tailored band alignment with enhanced excitonic systems. Here we report the first observations of neutral and charged interlayer excitons in trilayer WSe2-MoSe2-WSe2 van der Waals heterostructures and their dynamics. The addition of a WSe2 layer in the trilayer leads to significantly higher photoluminescence quantum yields and tunable spectral resonance compared to its bilayer heterostructures at cryogenic temperatures. The observed enhancement in the photoluminescence quantum yield is due to significantly larger electron-hole overlap and higher light absorbance in the trilayer heterostructure, supported via first-principle pseudopotential calculations based on spin-polarized density functional theory. We further uncover the temperature- and power-dependence, as well as time-resolved photoluminescence of the trilayer heterostructure interlayer neutral excitons and trions. Our study elucidates the prospects of manipulating light emission from interlayer excitons and designing atomic heterostructures from first-principles for optoelectronics. Copyright © 2017, The Authors. All rights reserved.

关键词： Transition metals

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Analysis of Key Generation Rate from Wireless Channel in In-Band Full-Duplex Communications

Analysis of Key Generation Rate from Wireless Channel in In-...

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International Conference on Communications Workshops

作者： Alireza Sadeghi Michele Zorzi Farshad Lahouti Electrical and Computer Engineering Department University of Minnesota USA Department of Information Engineering University of Padova Italy Electrical Engineering Department California Institute of Technology USA

In this paper, the impact of in-band full-duplex (IBFD) wireless communications on secret key generation via physical layer channel state information is investigated. A key generation strategy for IBFD wireless devices to increase the rate of generated secret keys over multipath fading channels is proposed. Conventionally, due to the half-duplex (HD) constraint on wireless transmissions, sensing simultaneous reciprocal channel measurements is not possible, which leads to a degraded key generation rate. However, with the advent of IBFD wireless devices, the legitimate nodes can sense the shared wireless link simultaneously at the possible cost of a self-interference (SI) channel estimation and some residual self-interference (RSI). As we demonstrate, with HD correlated observations the key rate is upper bounded by a constant, while with IBFD the key rate is only limited by the SI cancellation performance and is in general greater than that of its HD counterpart. Our analysis shows that with reasonable levels of SI cancellation, in the high SNR regime the key rate of IBFD is much higher, while in low SNRs, the HD system performs better. Finally, the key rate loss due to the overhead imposed by the SI channel estimation phase is discussed.

关键词： Analysis Key Generation

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Author Correction: Open-access quantitative MRI data of the spinal cord and reproducibility across participants, sites and manufacturers

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Scientific data 2021年第1期8卷 242页

作者： Julien Cohen-Adad Eva Alonso-Ortiz Mihael Abramovic Carina Arneitz Nicole Atcheson Laura Barlow Robert L Barry Markus Barth Marco Battiston Christian Büchel Matthew Budde Virginie Callot Anna J E Combes Benjamin De Leener Maxime Descoteaux Paulo Loureiro de Sousa Marek Dostál Julien Doyon Adam Dvorak Falk Eippert Karla R Epperson Kevin S Epperson Patrick Freund Jürgen Finsterbusch Alexandru Foias Michela Fratini Issei Fukunaga Claudia A M Gandini Wheeler-Kingshott Giancarlo Germani Guillaume Gilbert Federico Giove Charley Gros Francesco Grussu Akifumi Hagiwara Pierre-Gilles Henry Tomáš Horák Masaaki Hori James Joers Kouhei Kamiya Haleh Karbasforoushan Miloš Keřkovský Ali Khatibi Joo-Won Kim Nawal Kinany Hagen H Kitzler Shannon Kolind Yazhuo Kong Petr Kudlička Paul Kuntke Nyoman D Kurniawan Slawomir Kusmia René Labounek Maria Marcella Laganà Cornelia Laule Christine S Law Christophe Lenglet Tobias Leutritz Yaou Liu Sara Llufriu Sean Mackey Eloy Martinez-Heras Loan Mattera Igor Nestrasil Kristin P O'Grady Nico Papinutto Daniel Papp Deborah Pareto Todd B Parrish Anna Pichiecchio Ferran Prados Àlex Rovira Marc J Ruitenberg Rebecca S Samson Giovanni Savini Maryam Seif Alan C Seifert Alex K Smith Seth A Smith Zachary A Smith Elisabeth Solana Y Suzuki George Tackley Alexandra Tinnermann Jan Valošek Dimitri Van De Ville Marios C Yiannakas Kenneth A Weber Ii Nikolaus Weiskopf Richard G Wise Patrik O Wyss Junqian Xu NeuroPoly Lab Institute of Biomedical Engineering Polytechnique Montreal Montreal QC Canada. jcohen@polymtl.ca. Functional Neuroimaging Unit CRIUGM Université de Montréal Montreal QC Canada. jcohen@polymtl.ca. Mila - Quebec AI Institute Montreal QC Canada. jcohen@polymtl.ca. NeuroPoly Lab Institute of Biomedical Engineering Polytechnique Montreal Montreal QC Canada. Department of Radiology Swiss Paraplegic Centre Nottwil Switzerland. Centre for Advanced Imaging The University of Queensland Brisbane Australia. Department of Radiology University of British Columbia Vancouver BC Canada. Athinoula A. Martinos Center for Biomedical Imaging Department of Radiology Massachusetts General Hospital Charlestown MA USA. Department of Radiology Harvard Medical School Boston MA USA. Harvard-Massachusetts Institute of Technology Health Sciences & Technology Cambridge MA USA. School of Information Technology and Electrical Engineering The University of Queensland Brisbane Australia. NMR Research Unit Queen Square MS Centre UCL Queen Square Institute of Neurology Faculty of Brain Sciences University College London London UK. Department of Systems Neuroscience University Medical Center Hamburg-Eppendorf Hamburg Germany. Department of Neurosurgery Medical College of Wisconsin Milwaukee WI USA. Aix-Marseille Univ CNRS CRMBM Marseille France. APHM Hopital Universitaire Timone CEMEREM Marseille France. Vanderbilt University Institute of Imaging Science Vanderbilt University Medical Center Nashville TN USA. Department of Computer and Software Engineering Polytechnique Montreal Montreal Canada. CHU Sainte-Justine Research Centre Montreal QC Canada. Centre de Recherche CHUS CIMS Sherbrooke Canada. Sherbrooke Connectivity Imaging Lab (SCIL) Computer Science department Université de Sherbrooke Sherbrooke Canada. Université de Strasbourg CNRS ICube Strasbourg France. UHB - University Hospital Brno and Masaryk University Department of Radiology and Nuclear

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Improved design of digital 1-D and 2-D notch filters using general feedback structure

Improved design of digital 1-D and 2-D notch filters using g...

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International Symposium on Circuits and Systems

作者： Soo-Chang Pei Bo-Yi Guo Wen-Yang Lu Gerald E. Sobelman Yun-Da Huang Graduate Institute of Communication Engineering National Taiwan University Taiwan China Department of Electrical and Computer Engineering University of Minnesota USA

ISBN: (纸本)9781479953424

In this paper, a general feedback structure is proposed to improve the performance of existing digital notch filters. With the feedback structure, the notch filter can have a narrower stopband. This structure can be applied to any type of existing notch filter. We first derive the improved design of existing one-dimensional (1-D) filters. Then, by suitably extending the 1-D concept, the design of two-dimensional (2-D) notch filters is also derived. To demonstrate the effectiveness of the proposed design, an experiment on the interference removal of an image is presented. Moreover, a new forward and reverse algorithm for 2-D image filtering is proposed to reduce the transient error and enhance the signal-to-noise ratio drastically.

关键词： Notch filters Signal to noise ratio Image filtering Filtering algorithms Interference IIR filters

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SEPRAN: A Versatile Finite-Element Package for a Wide Variety of Problems in Geosciences

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Journal of Earth Science 2015年第1期26卷 89-95页

作者： Arie van den Berg Guus Segal David A.Yuen Department of Theoretical Geophysics Institute of Earth SciencesUtrecht University3508 TC UtrechtThe Netherlands Faculty of Electrical Engineering Mathematics and Computer ScienceTU DelftThe Netherlands Department of Earth Sciences and Minnesota Supercomputing Institute University of MinnesotaMinneapolis MN 55455USA School of Environmental Studies China University of Geosciences

Numerical modelling of geological processes, such as mantle convection, flow in porous media, and geothermal heat transfer, has become quite common with the increase in computing and the availability of usable software. Today modelling these dynamical processes entails the solving of the governing equations involving the mass, momentum, energy and chemical transport. These equations represent partial differential equations and must be solved on powerful enough computers because they require sufficient spatial and temporal resolution to be useful. We describe here the salient and outstanding features of the SEPRAN software package, developed in the Netherlands, as a case study for a robust and user-friendly soft- ware, which the geological community can utilize in handling many thermal-mechanical-chemical problems found in geology, which will include geothermal situations, where many types of partial differential equations must be solved at the same time with thermodynamical input parameters.

关键词： SEPRAN finite element package geodynamic and planetary modelling geothermal groundwater flow.

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On the definiteness of graph Laplacians with negative weights: Geometrical and passivity-based approaches

On the definiteness of graph Laplacians with negative weight...

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American Control Conference

作者： Yongxin Chen Sei Zhen Khong Tryphon T. Georgiou Department of Mechanical Engineering University of Minnesota Minneapolis 55455 USA Institute for Mathematics and its Applications University of Minnesota Minneapolis 55455 USA Department of Electrical and Computer Engineering University of Minnesota Minneapolis 55455 USA

ISBN: (纸本)9781467386838

The positive semidefiniteness of Laplacian matrices corresponding to graphs with negative edge weights is studied. Two alternative proofs to a result by Zelazo and Burger (Theorem 3.2), which provides upper bounds on the magnitudes of the negative weights in terms of effective resistances within which to ensure definiteness of the Laplacians, are provided. Both proofs are direct and intuitive. The first employs purely geometrical arguments while the second relies on passivity arguments and the laws of physics for electrical circuits. The latter is then used to establish consensus in multi-agent systems with generalized high-order dynamics. A numerical example is given at the end of the paper to highlight the result.

关键词： Laplace equations Manganese Multi-agent systems Resistance Eigenvalues and eigenfunctions Robustness Multi-agent systems Laplace's equation Eigenfunctions manganese Proof Robustness Laplacian operator

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Chiral plasmon in gapped Dirac systems

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Physical Review B 2016年第4期93卷 041413(R)-041413(R)页

作者： Anshuman Kumar Andrei Nemilentsau Kin Hung Fung George Hanson Nicholas X. Fang Tony Low Mechanical Engineering Department Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Electrical Engineering & Computer Science University of Wisconsin-Milwaukee Milwaukee Wisconsin 53211 USA Department of Applied Physics The Hong Kong Polytechnic University Hong Kong China Department of Electrical & Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA

We study the electromagnetic response and surface electromagnetic modes in a generic gapped Dirac material under pumping with circularly polarized light. The valley imbalance due to pumping leads to a net Berry curvature, giving rise to a finite transverse conductivity. We discuss the appearance of nonreciprocal chiral edge modes, their hybridization and waveguiding in a nanoribbon geometry, and giant polarization rotation in nanoribbon arrays.

关键词： Geometric & topological phases Plasmons 2-dimensional systems Rotating wave approximation

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