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arXiv 2022年

作者： Do, Dinh-Thuan Le, Anh-Tu Mumtaz, Shahid Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Faculty of Information Technology Van Lang University Ho Chi Minh City Viet Nam Instituto de Telecomunicações Aveiro Portugal ARIES Research Center Universidad Antonio de Nebrija C/Pirineos 55 MadridE-28040 Spain

Since Internet of Things (IoT) is suggested as the fundamental platform to adapt massive connections and secure transmission, we study physical-layer authentication in the point-to-point wireless systems relying on reconfigurable intelligent surfaces (RIS) technique. Due to lack of direct link from IoT devices (both legal and illegal devices) to the access point, we benefit from RIS by considering two main secure performance metrics. As main goal, we examine the secrecy performance of a RIS-aided wireless communication systems which show secure performance in the presence of an eavesdropping IoT devices. In this circumstance, RIS is placed between the access point and the legitimate devices and is designed to enhance the link security. To specify secure system performance metrics, we firstly present analytical results for the secrecy outage probability. Then, secrecy rate is further examined. Interestingly, we are to control both the average signal-to-noise ratio at the source and the number of metasurface elements of the RIS to achieve improved system performance. We verify derived expressions by matching Monte-Carlo simulation and analytical results. © 2022, CC BY-NC-SA.

关键词： Internet of things

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On the Road to 6G: Visions, Requirements, Key Technologies and Testbeds

arXiv

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arXiv 2023年

作者： Wang, Cheng-Xiang You, Xiaohu Gao, Xiqi Zhu, Xiuming Li, Zixin Zhang, Chuan Wang, Haiming Huang, Yongming Chen, Yunfei Haas, Harald Thompson, John S. Larsson, Erik G. Di Renzo, Marco Tong, Wen Zhu, Peiying Shen, Xuemin Poor, H. Vincent Hanzo, Lajos The National Mobile Communications Research Laboratory School of Information Science and Engineering Southeast University Nanjing210096 China The Purple Mountain Laboratories Nanjing211111 China The School of Information Science and Engineering The State Key Laboratory of Millimeter Waves Southeast University Nanjing210096 China The Pervasive Communication Research Center Purple Mountain Laboratories Nanjing211111 China The School of Engineering The University of Warwick CoventryCV4 7AL United Kingdom The LiFi Research and Development Center Department of Electronic and Electrical Engineering University of Strathclyde GlasgowG1 1XQ United Kingdom The Institute for Digital Communications School of Engineering University of Edinburgh EdinburghEH9 3JL United Kingdom Linköping University Linköping581 83 Sweden Université Paris-Saclay CNRS CentraleSupélec Laboratoire des Signaux et Systèmes 3 Rue Joliot-Curie Gif-sur-Yvette91192 France The Wireless Advanced System and Competency Centre HUAWEI Technologies Co. Ltd. OttawaONK2K 3J1 Canada HUAWEI Technologies Canada Co. Ltd. OttawaONK2K 3J1 Canada The Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada The Department of Electrical and Computer Engineering Princeton University PrincetonNJ08544 United States The School of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom

Fifth generation (5G) mobile communication systems have entered the stage of commercial development, providing users with new services and improved user experiences as well as offering a host of novel opportunities to various industries. However, 5G still faces many challenges. To address these challenges, international industrial, academic, and standards organizations have commenced research on sixth generation (6G) wireless communication systems. A series of white papers and survey papers have been published, which aim to define 6G in terms of requirements, application scenarios, key technologies, etc. Although ITU-R has been working on the 6G vision and it is expected to reach a consensus on what 6G will be by mid-2023, the related global discussions are still wide open and the existing literature has identified numerous open issues. This paper first provides a comprehensive portrayal of the 6G vision, technical requirements, and application scenarios, covering the current common understanding of 6G. Then, a critical appraisal of the 6G network architecture and key technologies is presented. Furthermore, existing testbeds and advanced 6G verification platforms are detailed for the first time. In addition, future research directions and open challenges are identified for stimulating the on-going global debate. Finally, lessons learned to date concerning 6G networks are discussed. © 2023, CC BY.

关键词： Network architecture

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Tuning Dzyaloshinskii-Moriya interaction in ferrimagnetic GdCo: A first-principles approach

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Physical Review B 2021年第17期103卷 174414-174414页

作者： Md Golam Morshed Khoong Hong Khoo Yassine Quessab Jun-Wen Xu Robert Laskowski Prasanna V. Balachandran Andrew D. Kent Avik W. Ghosh Department of Electrical and Computer Engineering University of Virginia Charlottesville Virginia 22904 USA Institute of High Performance Computing Agency for Science Technology and Research 1 Fusionopolis Way Connexis Singapore 138632 Singapore Center for Quantum Phenomena Department of Physics New York University New York New York 10003 USA Department of Materials Science and Engineering University of Virginia Charlottesville Virginia 22904 USA Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville Virginia 22904 USA Department of Physics University of Virginia Charlottesville Virginia 22904 USA

We present a systematic analysis of our ability to tune chiral Dzyaloshinskii-Moriya interaction (DMI) in compensated ferrimagnetic Pt/GdCo/Pt1−xWx trilayers by cap layer composition. Using first-principles calculations, we show that the DMI increases rapidly for only ∼10% W and saturates thereafter, in agreement with experiments. The calculated DMI shows a spread in values around the experimental mean, depending on the atomic configuration of the cap layer interface. The saturation is attributed to the vanishing of spin-orbit coupling energy at the cap layer and the simultaneous constancy at the bottom interface. Additionally, we predict the DMI in Pt/GdCo/X (X=Ta,W,Ir) and find that W in the cap layer favors a higher DMI than Ta and Ir that can be attributed to the difference in d-band overlap around the Fermi level. Our results open up exciting combinatorial possibilities for controlling the DMI in ferrimagnets towards nucleating and manipulating ultrasmall high-speed skyrmions.

关键词： Dzyaloshinskii-Moriya interaction Ferrimagnetism Magnetic multilayers First-principles calculations

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Flexible modeling of large-scale neural network stimulation: electrical and optical extensions to The Virtual Electrode Recording Tool for EXtracellular Potentials (VERTEX)

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Journal of Neuroscience Methods 2025年 422卷

作者： Anne F. Pierce Larry Shupe Julien Bloch Eberhard Fetz Azadeh Yazdan-Shahmorad Department of Bioengineering University of Washington Seattle WA 98195 USA Washington National Primate Research Center Seattle WA 98195 USA Department of Physiology and Biophysics University of Washington Seattle WA 98195 USA Department of Electrical and Computer Engineering University of Washington Seattle WA 98195 USA

Background Computational models that predict effects of neural stimulation can serve as a preliminary tool to inform in-vivo research, reducing costs, time, and ethical considerations. However, current models do not support the diverse neural stimulation techniques used in-vivo , including the expanding selection of electrodes, stimulation modalities, and stimulation protocols. New method We developed several extensions to The Virtual Electrode Recording Tool for EXtracellular Potentials (VERTEX), the MATLAB-based neural stimulation tool. VERTEX simulates input currents in a large population of multi-compartment neurons within a small cortical slice to model electric field stimulation, while recording local field potentials (LFPs) and spiking activity. Our extensions enhance this framework with support for multiple pairs of parametrically defined electrodes and biphasic, bipolar stimulation delivered at programmable delays. To support the growing use of optogenetic approaches for targeted neural stimulation, we introduced a feature that models optogenetic stimulation through an additional VERTEX input function that converts irradiance to currents at optogenetically responsive neurons. Finally, we added extensions to allow complex stimulation protocols including paired-pulse, spatiotemporal patterned, and closed-loop stimulation. Results We demonstrated these novel features using VERTEX’s built-in functionalities, with results consistent with other models and experimental work. Comparison with existing methods Unlike other tools, our extensions enable both electric field and optogenetic stimulation, provide a range of open- and closed-loop protocols, and offer flexible settings within a large-scale cortical network of neurons with realistic biophysical properties. Conclusions Our extensions provide an all-in-one platform to efficiently and systematically test diverse, targeted, and individualized stimulation patterns.

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Long-range transport of 2D excitons in dynamic acoustic lattice

Research Square

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research Square 2021年

作者： Peng, Ruoming Ripin, Adina Ye, Yusen Zhu, Jiayi Wu, Changming Lee, Seokhyeong Li, Huan Taniguchi, Takashi Watanabe, Kenji Cao, Ting Xu, Xiaodong Li, Mo Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States Department of Physics University of Washington SeattleWA98195 United States Department of Material Science and Engineering University of Washington SeattleWA98195 United States Research Center for Functional Materials National Institute for Materials Science Tsukuba Japan

Excitons are elementary optical excitation in semiconductors. The ability to manipulate and transport these quasiparticles would enable excitonic circuits and devices for quantum photonic technologies. Recently, interlayer excitons in 2D semiconductors have emerged as a promising candidate for engineering excitonic devices due to long lifetime, large exciton binding energy, and gate tunability. However, the charge-neutral nature of the excitons leads to a weak response to the in-plane electric field and thus inhibits transport beyond the diffusion length. Here, we demonstrate the directional transport of interlayer excitons in bilayer WSe2 driven by the dynamic potential lattice induced by surface acoustic waves (SAW). We show that at 100 K, the SAW-driven excitonic transport is activated above a threshold acoustic power and reaches a distance at least ten times longer than the diffusion length, only limited by the device size. Temperature-dependent measurement reveals the transition from the diffusion-limited regime at low temperature to an acoustic field-driven regime at elevated temperature. Our work shows that acoustic waves are an effective, contact-free means to control exciton dynamics and transport, promising for realizing 2D materials-based excitonic devices such as exciton transistors, switches, and transducers. © 2021, CC BY.

关键词： Excitons

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A DC-Ka-Band 7-Bit Passive Attenuator with Capacitive-Compensation-Based Bandwidth Extension Technique in 55-nm CMOS

A DC-Ka-Band 7-Bit Passive Attenuator with Capacitive-Compen...

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作者： Zhang, Zijiang Li, Nayu Gao, Huiyan Li, Min Wang, Shaogang Kuan, Yen-Cheng Song, Chunyi Yu, Xiaopeng Gu, Qun Jane Xu, Zhiwei Ocean College Institute of Marine Electronics and Intelligent Systems Zhejiang University Zhoushan China College of Information Science and Electronic Engineering Institute of VLSI Design Zhejiang University Hangzhou China Department of Electrical and Computer Engineering University of California at Davis DavisCA United States Engineering Research Center of Oceanic Sensing Technology and Equipment Ministry of Education Zhoushan316021 China Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province Zhoushan316021 China International College of Semiconductor Technology National Chiao Tung University Hsinchu30010 Taiwan

This article presents a 7-bit wideband passive attenuator with low insertion loss (IL) and high attenuation accuracy in 55-nm CMOS technology. The $\pi $ -type and bridge-T-type attenuation units utilize an effective capacitive compensation technique, whose bandwidth extension mechanism is detailed in a single-unit pole-zero analysis. The matching-induced performance deterioration is investigated to minimize amplitude and phase errors at the chip level. The fabricated attenuator demonstrates a 32.4-dB attenuation range with a 0.255-dB resolution and a 3.5-8.4-dB IL from dc to 32 GHz. The measured root-mean-square (rms) amplitude and phase errors are below 0.32 dB and 5.33°, respectively. The attenuator occupies a 0.054-mm2 core area and consumes negligible power. © 1963-2012 IEEE.

关键词： Insertion losses

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Homogenization and design of acoustic Willis metasurfaces

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Physical Review B 2021年第5期103卷 054306-054306页

作者： Hussein Esfahlani Yarden Mazor Andrea Alù Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Kymeta Corporation Redmond Washington 98052 USA Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 USA Physics Program Graduate Center of the City University of New York New York New York 10016 USA

Metasurfaces are ultrathin planar arrays of carefully tailored subwavelength particles that enable agile and flexible manipulation of the impinging waves. Originally introduced in optics, their application to acoustic waves has recently opened exciting opportunities for exotic sound control. In conventional acoustic inclusions, the interactions with the impinging pressure and velocity are decoupled, limiting the functionalities that arrays of them can achieve. While the coupling between these two quantities in symmetry-breaking inclusions, known as Willis coupling, has been discussed for several years, only recently has it been realized that these phenomena can become nonperturbative in suitably tailored resonant scatterers. Here, we explore the opportunities that these Willis meta-atoms open in the context of acoustic metasurfaces, offering additional knobs to manipulate and tailor sound. The general response of Willis metasurface is analytically derived, yielding fundamental bounds and optimal surface responses enabling full control of the impinging acoustic wave front.

关键词： Acoustic metamaterials Acoustic wave phenomena Polarizability

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Joint Resource Allocation and Routing for Service Function Chaining with In-Subnetwork Processing

Joint Resource Allocation and Routing for Service Function C...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Navid Reyhanian Hamid Farmanbar Soheil Mohajer Zhi-Quan Luo Department of Electrical and Computer Engineering University of Minnesota Twin Cities MN USA Huawei Canada Research Center Ottawa Canada

ISBN: (数字)9781509066315

ISBN: (纸本)9781509066315;9781509066322

Network Function Virtualization (NFV) is an efficient approach to simplify and accelerate the deployment of diverse network services. A critical challenge lies in mapping Virtual Network Functions (VNFs) to high-volume servers, resource allocation, and traffic routing. In this paper, we study the joint problem of VNF placement on servers and traffic engineering for a network spanning multiple subnetworks. Each subnetwork is owned and controlled by a different administrator. We formulate the joint problem of routing and VNF placement cost minimization subject to flow demands where processing flows in local subnetworks is encouraged. To ensure sensitive information of administrators remains private and to cut the implementation cost, a scalable and decentralized approach based on the proximal Alternating Direction Method of Multipliers (ADMM) is proposed. Extensive numerical evaluations show the efficiency of our approach against existing work.

关键词： computer network management resource allocation telecommunication computing telecommunication network routing telecommunication traffic virtualisation

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Multi-camera tracking of vehicles based on deep features re-id and trajectory-based camera link models 32

Multi-camera tracking of vehicles based on deep features re-...

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32nd IEEE/CVF Conference on computer Vision and Pattern Recognition Workshops, CVPRW 2019

作者： Hsu, Hung-Min Huang, Tsung-Wei Wang, Gaoang Cai, Jiarui Lei, Zhichao Hwang, Jenq-Neng Department of Electrical and Computer Engineering University of Washington United States Research Center for Information Technology Innovation Academia Sinica Taiwan

ISBN: (纸本)9781728125060

Due to the exponential growth of traffic camera net- works, the need for multi-camera tracking (MCT) for in- telligent transportation has received more and more at- tention. The challenges of MCT include similar vehicle models, significant feature variation in different orienta- tions, color variation of the same car due to lighting con- ditions, small object sizes and frequent occlusion, as well as the varied resolutions of videos. In this work, we pro- pose an MCT system, which combines single-camera track- ing (SCT) and inter-camera tracking (ICT) which includes trajectory-based camera link model and deep feature re- *** SCT, we use a TrackletNet Tracker (TNT), which effectively generates the moving trajectories of all de- tected vehicles by exploiting temporal and appearance in- formation of multiple tracklets that are created by associat- ing bounding boxes of detected vehicles. The tracklets are generated based on CNN feature matching and intersection- over-union (IOU) in every single-camera view. In terms of deep feature re-identification, we exploit the temporal at- tention model to extract the most discriminant feature of each trajectory. In addition, we propose the trajectory- based camera link models with order constraint to effi- ciently leverage the spatial and temporal information for ICT. The proposed method is evaluated on CVPR AI City Challenge2019 City Flow dataset, achieving IDF1 70.59%, which outperforms competing methods. © 2019 IEEE computer Society. All rights reserved.

关键词： Vehicles

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GRU controller-based UPQC compensator design for improving power quality in grid-integrated non-linear load system

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Scientific reports 2025年第1期15卷 19677页

作者： B Srikanth Goud Ch Naga Sai Kalyan Gundala Srinivasa Rao Bhabasis Mohapatra Narsimha Reddy Kuppireddy Harish Pulluri Ch Rami Reddy Mohammad Shorfuzzaman Basem Abu Zneid Mukesh Pushkarna Department of Electrical and Electronics Engineering School of Engineering Anurag University Hyderabad 500088 India. Department of Electrical and Electronics Engineering Vasireddy Venkatadri International Technological University (VVITU) Guntur 522 508 India. Department of Electrical and Electronics Engineering CMR College of Engineering & Technology Hyderabad India. Department of Electrical Engineering ITER Siksha 'O' Anusandhan (Deemed to be University) Bhubaneswar 751030 Odisha India. bhabasismohapatra@soa.ac.in. Department of Electronics and Communication Engineering Vardhaman College of Engineering Hyderabad Telangana India. Department of Electrical and Electronics Engineering Joginpally B R Engineering College Hyderabad 500075 India. Department of Computer Science College of Computers and Information Technology Taif University Taif 21944 Saudi Arabia. Robotics and Artificial Intelligence Engineering Department Faculty of Engineering Hourani Center for Applied Scientific Research Al-Ahliyya Amman University Amman Jordan. Department of Electrical Engineering GLA University Mathura Mathura Uttar Pradesh India.

Power quality has prominently gained its importance in power systems with the advancement of technology. Voltage sags/swells, harmonics, and other disturbances are the major issues causing most of the technical and financial damages which are reducing the quality of energy supplied. To overcome these challenges design of a unified power quality conditioner (UPQC) plays a vital role in mitigating the PQ issues. In this paper, an advanced neural network base approach is developed to manage UPQC to maintain a constant power supply for the end users. DC link of UPQC is taken from PV, fuel, and battery at a specific range. The compensator DC link is linked in a smart grid with nonlinear load. On the other hand, the switching pulse was performed with the use of the Gated Recurrent Unit (GRU) controller technique. Various fault conditions are created to make a dataset that is utilized to design the GRU that analyses the load voltage and current at each second to generate a pulse for UPQC. The performance is evaluated utilizing an advanced controller under various conditions, including swell, sag, harmonics, and combined three-phase faults. The low harmonic content of voltage is 0.04%, 0.25%, and 0.98%. The suggested controller is accessible with 99.5% specificity, 99% sensitivity, and 98% accuracy. The proposed controller provides low harmonic content while operating in a highly secure, dependable, and efficient manner.

关键词： Battery Fuel GRU Harmonics reduction PV Power quality UPQC

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