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Design of Energy Modulation Massive SIMO Transceivers via Machine Learning

Journal of Communications and Information Networks 2020年第3期5卷 358-368页

作者： Muhang Lan Jianhao Huang Han Zhang Chuan Huang National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of ChinaChengdu 611731China The Future Network of Intelligence Institute and the School of Science and Engineering the Chinese University of Hong KongShenzhen 518172China Department of Electrical and Computer Engineering University of CaliforniaDavis 95616USA

This paper considers a massive single-input multiple-output(SIMO)system,where multiple singleantenna transmitters simultaneously communicate with a receiver equipped with a large number of *** from the conventional noncoherent transceivers which require a certain level of the statistical information on the channel fading,we propose a joint transceiver design method based on machine learning,requiring a limited number of channel *** the proposed method,the multiple transmitters,the channel,and the receiver are represented with a deep neural network(NN),and an autoencoder is adopted to minimize the end-to-end transmission error ***,the relationship between the number of training samples and the transmission error probability is analyzed based on the confidence interval *** results show that the proposed NN-based transceiver achieves lower transmission error probability in typical scenarios,and is more robust against the channel parameters variation compared with the existing methods.

关键词： neural network(NN) energy modulation massive single-input multiple-output(SIMO) joint transceiver design confidence interval

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Local negative permittivity and topological phase transition in polar skyrmions (vol 20, pg 194, 2021)

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NATURE MATERIALS 2021年第6期20卷 905-905页

作者： Das, S. Hong, Z. Stoica, V. A. Goncalves, M. A. P. Shao, Y. T. Parsonnet, E. Marksz, E. J. Saremi, S. McCarter, M. R. Reynoso, A. Long, C. J. Hagerstrom, A. M. Meyers, D. Ravi, V. Prasad, B. Zhou, H. Zhang, Z. Wen, H. Gomez-Ortiz, F. Garcia-Fernandez, P. Bokor, J. iniguez, J. Freeland, J. W. Orloff, N. D. Junquera, J. Chen, L. Q. Salahuddin, S. Muller, D. A. Martin, L. W. Ramesh, R. Department of Materials Science and Engineering University of California Berkeley CA USA Department of Physics University of California Berkeley CA USA Department of Materials Science and Engineering The Pennsylvania State University University Park PA USA Department of Mechanical Engineering Carnegie Mellon University Pittsburgh PA USA Materials Research and Technology Department Luxembourg Institute of Science and Technology (LIST) Esch/Alzette Luxemburg Departamento de Ciencias de la Tierra y Física de la Materia Condensada Universidad de Cantabria Cantabria Campus Internacional Santander Spain Physics and Materials Science Research Unit University of Luxembourg Belvaux Luxembourg School of Applied and Engineering Physics Cornell University Ithaca NY USA National Institute of Standards and Technology Boulder CO USA Advanced Photon Source Argonne National Laboratory Argonne IL USA Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA Kavli Institute at Cornell for Nanoscale Science Ithaca NY USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA USA

A Correction to this paper has been published: https://***/10.1038/s41563-021-00962-z.

关键词： Ferroelectrics and multiferroics

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Topological Microlaser with A non-Hermitian Topological Bulk

arXiv

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arXiv 2023年

作者： Li, Zhitong Luo, Xi-Wang Lin, Dayang Gharajeh, Abouzar Moon, Jiyoung Hou, Junpeng Zhang, Chuanwei Gu, Qing Department of Electrical and Computer Engineering The University of Texas at Dallas RichardsonTX75080 United States State Key Laboratory of Information Photonics and Optical Communications School of Science Beijing University of Posts and Telecommunications Beijing100876 China Department of Physics The University of Texas at Dallas RichardsonTX75080 United States CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695 United States Department of Physics North Carolina State University RaleighNC27695 United States

Bulk-edge correspondence, with quantized bulk topology leading to protected edge states, is a hallmark of topological states of matter and has been experimentally observed in electronic, atomic, photonic, and many other systems. While bulk-edge correspondence has been extensively studied in Hermitian systems, a non-Hermitian bulk could drastically modify the Hermitian topological band theory due to the interplay between non-Hermiticity and topology;and its effect on bulk-edge correspondence is still an ongoing pursuit. Importantly, including non-Hermicity can significantly expand the horizon of topological states of matter and lead to a plethora of unique properties and device applications, an example of which is a topological laser. However, the bulk topology, and thereby the bulk-edge correspondence, in existing topological edge-mode lasers is not well defined. Here, we propose and experimentally probe topological edge-mode lasing with a well-defined non-Hermitian bulk topology in a one-dimensional (1D) array of coupled ring resonators. By modeling the Hamiltonian with an additional degree of freedom (referred to as synthetic dimension), our 1D structure is equivalent to a 2D non-Hermitian Chern insulator with precise mapping. Our work may open a new pathway for probing non-Hermitian topological effects and exploring non-Hermitian topological device applications. Copyright © 2023, The Authors. All rights reserved.

关键词： Topology

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A Thin Film Barium Titanate-on-Insulator Optoelectronics Platform with Various Photonic Devices

A Thin Film Barium Titanate-on-Insulator Optoelectronics Pla...

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CLEO: science and Innovations, S and I 2022

作者： Cao, Yu Ng, Jun Da Lin, Hong-Lin Shao, Jianbo Qi, Luo Siew, Shawn Yohanes Dogheche, Elhadj Danner, Aaron J. Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore117583 Singapore Advanced Micro Foundry 11 Science Park Road Singapore117685 Singapore Microsoft Research 21 Station Road CambridgeCB1 2FB United Kingdom Institute of Electronics Microelectronics and Nanotechnology IEMN DOAE Université Polytechnique Hauts-de-France Valenciennes59309 France

We present a thin-film barium titanate-on-insulator platform and its optical and electrooptic properties, some of which are superior to lithium niobate-on-insulator, and discuss our progress in device fabrication, per... 详细信息

ISBN: (纸本)9781557528209

关键词： Barium titanate

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Relaxation Based Modeling of GMD Induced Cascading Failures in ***

Relaxation Based Modeling of GMD Induced Cascading Failures ...

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2021 North American Power Symposium, NAPS 2021

作者： Mate, Adam Barnes, Arthur K. Morley, Steven K. Friz-Trillo, Jacob A. Cotilla-Sanchez, Eduardo Blake, Sean P. Los Alamos National Laboratory Advanced Network Science Initiative Los AlamosNM87545 United States Los Alamos National Laboratory Space Science and Applications Group Los AlamosNM87545 United States Department of Electrical and Biomedical Engineering University of Vermont BurlingtonVT05405 United States Oregon State University School of Electrical Engineering and Computer Science CorvallisOR97331 United States NASA Goddard Space Flight Center Heliophysics Science Division GreenbeltMD20771 United States

ISBN: (纸本)9781665420815

A major risk of geomagnetic disturbances (GMDs) is cascading failure of electrical grids. The modeling of GMD events and cascading outages in power systems is difficult, both independently and jointly, because of the many different mechanisms and physics involved. This paper introduces a relaxation based modeling of GMD-induced cascading failures: the dc approximation-based DCSIMSEP solver was adapted to simulate cascading as a result of GMDs, the full set of ac power flow equations were relaxed to guarantee optimality, and the reactive power losses were modeled while keeping the problem convex. The developed algorithm was implemented in *** - an open-source software specifically designed to model and analyze geomagnetic hazards - and demonstrated to work on the RTS-GMLC-GIC-EAST synthetic test network. © 2021 IEEE.

关键词： Open source software

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Byzantine-Resilient Decentralized Stochastic Optimization with Robust Aggregation Rules

arXiv

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arXiv 2022年

作者： Wu, Zhaoxian Chen, Tianyi Ling, Qing School of Computer Science and Engineering Guangdong Provincial Key Laboratory of Computational Science Sun Yat-Sen University Guangdong Guangzhou510006 China Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States Pazhou Lab Guangdong Guangzhou510330 China

This paper focuses on decentralized stochastic optimization in the presence of Byzantine attacks. During the optimization process, an unknown number of malfunctioning or malicious workers, termed as Byzantine workers, disobey the algorithmic protocol and send arbitrarily wrong messages to their neighbors. Even though various Byzantine-resilient algorithms have been developed for distributed stochastic optimization with a central server, we show that there are two major issues in the existing robust aggregation rules when being applied to the decentralized scenario: disagreement and non-doubly stochastic virtual mixing matrix. This paper provides comprehensive analysis that discloses the negative effects of these two issues, and gives guidelines of designing favorable Byzantine-resilient decentralized stochastic optimization algorithms. Under these guidelines, we propose iterative outlier scissor (IOS), an iterative filtering-based robust aggregation rule with provable performance guarantees. Numerical experiments demonstrate the effectiveness of IOS. The code of simulation implementation is available at ***/Zhaoxian-Wu/IOS. Copyright © 2022, The Authors. All rights reserved.

关键词： Optimization

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Dual Z-scheme Pr2Sn2O7/P@g-C3N4/SnS2 heterojunctions for the removal of tetracycline antibiotic by persulfate activation: Kinetics, thermodynamic parameters, density functional theory, and toxicity studies

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Chemical engineering Journal 2024年 479卷

作者： Prasanna, Sanjay Ballur Sakthivel, Rajalakshmi Shanthakumar, Karthik Chimatahalli Shivamurthy, Santhosh Arehalli Lin, Yu-Chien Dhawan, Udesh Liu, Xinke Chung, Ren-Jei Taipei10608 Taiwan Department of Chemistry SJCE JSS Science and Technology University Karnataka570006 India N.M.K.R.V. College for Women Karnataka 560011 India Centre for the Cellular Microenvironment Division of Biomedical Engineering James Watt School of Engineering Mazumdar-Shaw Advanced Research Centre University of Glasgow GlasgowG116EW United Kingdom College of Materials Science and Engineering Chinese Engineering and Research Institute of Microelectronics Shenzhen University Shenzhen518060 China Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore Taipei10608 Taiwan

In this study, a Pr2Sn2O7/P@g-C3N4/SnS2 ternary nanocomposite photocatalyst is obtained by hydrothermal synthesis followed by mechanical grinding. By separating electrons and holes (e−/h+) effectively through the dual Z-scheme heterojunction and activating persulfate (PS), the heterojunction demonstrated superior visible light-driven catalytic activity. Tetracycline (TC) was degraded (89.48%) in 60 min using 30 mg/L of ternary composite and 30 mg/L of PS. This system displayed the highest pseudo-first-order kinetic constant (0.0989 min−1 and R2 = 0.969). The electron paramagnetic resonance analysis showed that SO4[rad]−, [rad]OH, [rad]O2−, and 1O2 were involved in TC degradation. TC's vulnerability positions and degradation pathways were analyzed using DFT and gas chromatography-mass spectrometry analysis, while toxicity assessment software was used to determine the toxicity of intermediate products. Thus, Pr2Sn2O7/P@g-C3N4/SnS2 was established to be a promising photocatalyst template for pollutant remediation. © 2023 Elsevier B.V.

关键词： Density functional theory

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Antiferromagnetic FeTe2 1T−phase formation at the Sb2Te3/Ni80Fe20 interface

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Physical Review Materials 2023年第2期7卷 024406-024406页

作者： A. R. Will-Cole James L. Hart Matthew Matzelle Adrian Podpirka Nirjhar Bhattacharjee Shreya K. Patel Sarah H. Tolbert Arun Bansil Judy J. Cha Don Heiman Nian X. Sun Electrical and Computer Engineering Northeastern University Boston Massachusetts 02115 USA Materials Science and Engineering Cornell University Ithaca New York 14853 USA Department of Physics Northeastern University Boston Massachusetts 02115 USA Applied Physics Laboratory Johns Hopkins Laurel Maryland 20723 USA Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles California 90095 USA Plasma Science and Fusion Center Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

Bilayer topological insulator/ferromagnet (TI/FM) heterostructures are promising for spintronic applications due to their low switching energy and therefore power efficiency. Until recently, the reactivity of TIs with FM films was overlooked in the spin-orbit-torque literature, even though there are reports that it is energetically favorable for TIs to react with transition metals and form interfacial layers. In this study, we fabricated a TI/FM heterostructure comprised of molecular beam epitaxy grown Sb2Te3 and dc sputtered Ni80Fe20. Broadband ferromagnetic resonance revealed spin-pumping evident by the significant enhancement in Gilbert damping, which is likely a signature of the topological surface states or the presence of large spin-orbit coupling in the adjacent Sb2Te3. With low-temperature magnetometry, an exchange bias is observed that indicates an exchange interaction between an antiferromagnet (AFM) and an adjacent FM. Cross-section high-angle annular dark-field scanning transmission electron microscopy characterization of the Sb2Te3−Ni80Fe20 bilayer revealed a complex interface showing diffusion of Fe and Ni into the Sb2Te3 film yielding the formation of a FeTe2 1T−type structural phase. Furthermore, density functional theory calculations revealed that the FeTe2 1T−phase has an AFM ground state. Due to experimental limitations in the electron-energy-loss spectroscopy measurements, the precise chemistry of the interfacial phase could not be determined, therefore it is possible that the FeTe2 1T and/or an intermixed (Fe1–xNix)Te2 1T is the AFM interfacial phase contributing to exchange bias in the system. This work emphasizes the chemical complexity of TI/FM interfaces that host novel, metastable magnetic topological phases and require more in-depth studies of other similar interfaces.

关键词： Exchange bias Spintronics Topological insulators Antiferromagnets Solid-solid interfaces

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AlScN High Electron Mobility Transistors: Integrating High Piezoelectric, High K Dielectric, and Ferroelectric Functionality

AlScN High Electron Mobility Transistors: Integrating High P...

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BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS)

作者： Joseph Casamento Kazuki Nomoto Thai-Son Nguyen Hyunjea Lee Chandrasekhar Savant Lei Li Austin Hickman Takuya Maeda Yu-Tsun Shao Jimy Encomendero Ved Gund Timothy Vasen Shamima Afroz Daniel Hannan David A. Muller Huili Grace Xing Debdeep Jena Department of Materials Science and Engineering Cornell University Ithaca NY USA School of Electrical and Computer Engineering Cornell University Ithaca NY USA Kavli Institute at Cornell for Nanoscale Science Cornell University Ithaca NY USA School of Applied and Engineering Physics Cornell University Ithaca New York USA Northrop Grumman Mission Systems Advanced Technology Laboratory Linthicum Maryland USA Department of Physics Cornell University Ithaca New York USA

This paper presents an overview of the promising physical properties of the aluminum scandium nitride (AlScN) ternary alloy system and its integration in radiofrequency heterostructure high electron mobility transistors (RF HEMTs). Specifically, heterostructures with AlScN demonstrate enhanced piezoelectric response and enhanced relative dielectric permittivity, as well as ferroelectric behavior. These promising physical phenomena are manifested in HEMTs that show larger on current densities compared to aluminum gallium nitride (AlGaN) HEMTs and display ferroelectric behavior. An overlook on future improvements in thin film deposition and device fabrication is discussed to fully maximize the potential devices and integrated circuits incorporating AlScN.

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Cell vibron polariton resonantly self-confined in the myelin sheath of nerve

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Nano Research 2020年第1期13卷 38-44页

作者： Bo Song Yousheng Shu School of Optical-Electrical Computer Engineering University of Shanghai for Science and TechnologyShanghai200093China State Key Laboratory of Medical Neurobiology Institute for Translational Brain ResearchMOE Frontiers Center for Brain ScienceDepartment of NeurologyHuashan HospitalFudan UniversityShanghai200032China

Polaritons are arousing tremendous interests in physics and material sciences for their unique and amazing properties,especially including the condensation,lasing without inversion and even room-temperature ***,we propose a cell vibron polariton(cell-VP):a collectively coherent mode of a photon and all phospholipid molecules in a myelin sheath formed by glial ***-VP can be resonantly self-confined in the myelin sheath under physiological *** observations benefit from the specifically compact,ordered and polar thin-film structure of the sheath,and the relatively strong coupling of the mid-infrared photon with the vibrons of phospholipid tails in the *** underlying physics is revealed to be the collectively coherent superposition of the photon and vibrons,the polariton induced significant enhancement of myelin permittivity,and the resonance of the polariton with the *** captured cell-VPs in myelin sheaths may provide a promising way for super-efficient consumption of extra-weak bioenergy and even directly serve for quantum *** findings further the understanding of nervous system operations at cellular level from the view of quantum mechanics.

关键词： cell polariton nerves myelin sheath quantum state

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