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Progress in Electromagnetic Research Symposium (PIERS)

作者： Ping Li Yifei Shi Hakan Bagci Department of Electrical and Computer Engineering Purdue University West Lafayette IN USA Division of Computer Electrical and Mathematical Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Saudi Arabia Center for Uncertainty Quantification in Computational Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

ISBN: (纸本)9781509060948

Summary form only given. The discontinuous Galerkin time-domain (DGTD) method is gaining popularity among computational electromagnetics (CEM) practitioners. This can be attributed to the fact that it has several advantages over the classical finite element method. The DGTD method realizes “information exchange” between neighboring spatial discretization elements using numerical flux. Therefore all spatial operations are localized within a given element leading to a block-diagonal mass matrix which is inverted very efficiently only once before the time marching starts. Consequently, if an explicit time integrator is used, the DGTD method becomes high compact and efficient. Despite these advantages, the use of the DGTD method for analyzing electromagnetic field interactions on microwave systems loaded with cables/thin wires has been very limited. Direct application of the DGTD method for solving Maxwell equation on such structures will result in a rather inefficient simulation tool since the DGTD will call for a very fine discretization in the proximity of thin wires. To overcome this problem, in this work, electromagnetic field interactions on thin wires are modeled using the modified telegrapher's equation (MTEs), which describe a simplified relation between transient voltage and current distributions along a given thin wire. Like Maxwell equations, MTEs describes a hyperbolic system of equations, which are discretized using the one-dimensional (1D) DGTD method. The coupling between the two matrix systems resulting from the discretization of Maxwell equations and MTEs using 3D and 1D DGTD methods is realized by introducing equivalent source terms in each equation set. A weighted electric field obtained from the 3D discretization around the wire is introduced as a voltage source in the MTEs. A volume current density obtained from the 1D discretization on the wire is introduced as a current source in the Maxwell equation describing the Ampere's law equation, respecti

关键词： Wires Mathematical model Electromagnetics Microwave theory and techniques STEM Maxwell equations Three-dimensional displays

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Electron accumulation and emergent magnetism in lamno3/srtio3heterostructures

arXiv

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arXiv 2017年

作者： Chen, Zuhuang Chen, Zhanghui Liu, Z.Q. Holtz, M.E. Li, C.J. Renshaw Wang, X. Lü, W.M. Motapothula, M. Fan, L.S. Turcaud, J.A. Dedon, L.R. Frederick, C. Xu, R.J. Gao, R. N'Diaye, A.T. Arenholz, E. Mundy, J.A. Venkatesan, T. Muller, D.A. Wang, L.-W. Liu, J. Martin, L.W. Department of Materials Science and Engineering University of California BerkeleyCA94720 United States Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States School of Materials Science and Engineering Beihang University Beijing100191 China School of Applied and Engineering Physics Cornell University IthacaNY14853 United States Department of Materials Science and Engineering National University of Singapore Singapore117575 Singapore NUSNNI-Nanocore National University of Singapore Singapore117411 Singapore School of Physical and Mathematical Sciences School of Electrical and Electronic Engineering Nanyang Technological University Singapore637371 Singapore Condensed Matter Science and Technology Institute School of Science Harbin Institute of Technology Harbin150081 China Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

Emergent phenomena at polar-nonpolar oxide interfaces have been studied intensely in pursuit of next-generation oxide electronics and spintronics. Here we report the disentanglement of critical thicknesses for electron reconstruction and the emergence of ferromagnetism in polar-mismatched LaMnO3/SrTiO3(001) heterostructures. Using a combination of element-specific X-ray absorption spectroscopy and dichroism, and first-principles calculations, interfacial electron accumulation and ferromagnetism have been observed within the polar, antiferromagnetic insulator LaMnO3. Our results show that the critical thickness for the onset of electron accumulation is as thin as 2 unit cells (UC), significantly thinner than the observed critical thickness for ferromagnetism of 5 UC. The absence of ferromagnetism below 5 UC is likely induced by electron over-accumulation. In turn, by controlling the doping of the LaMnO3, we are able to neutralize the excessive electrons from the polar mismatch in ultrathin LaMnO3 films and thus enable ferromagnetism in films as thin as 3 UC, extending the limits of our ability to synthesize and tailor emergent phenomena at interfaces and demonstrating manipulation of the electronic and magnetic structures of materials at the shortest length scales. Copyright © 2017, The Authors. All rights reserved.

关键词： Lanthanum compounds

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Homogenization scheme for metamaterials in scalar waves

Homogenization scheme for metamaterials in scalar waves

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4th Advanced Electromagnetics Symposium, AES 2016

作者： Yang, Min Ma, Guancong Wu, Ying Yang, Zhiyu Sheng, Ping Department of Physics Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Institute of Advanced Study Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Division of Computer Electrical and Mathematical Science and Engineering King Abdullah University of Science and Technology Thuwal Saudi Arabia

We present a homogenization scheme for acoustic metamaterials that is based on reproducing the lowest orders of scattering amplitudes from a finite volume of metamaterials. This approach is noted to differ significantly from that of coherent potential approximation, which is based on adjusting the effective-medium parameters to minimize scatterings in the long-wavelength limit. With the aid of metamaterials' eigenstates, the effective parameters, such as mass density and elastic modulus can be obtained by matching the surface responses of a metamaterial's structural unit cell with a piece of homogenized material. From the Green's theorem applied to the exterior domain problem, matching the surface responses is noted to be the same as reproducing the scattering amplitudes. We verify our scheme by applying it to three different examples: a layered lattice, a two-dimensional hexagonal lattice, and a decorated-membrane system. It is shown that the predicted characteristics and wave fields agree almost exactly with numerical simulations and experiments and the scheme's validity is constrained by the number of dominant surface multipoles instead of the usual long-wavelength assumption. In particular, the validity extends to the full band in one dimension and to regimes near the boundaries of the Brillouin zone in two dimensions. © 2016 Advanced Electromagnetics Symposium. All rights reserved.

关键词： Metamaterials

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Improving task allocation in risk-aware robotic sensor networks via auction protocol selection

Improving task allocation in risk-aware robotic sensor netwo...

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IEEE International Conference on Intelligent engineering Systems (INES)

作者： Nicolas Primeau Rafael Falcon Rami Abielmona Voicu Groza Emil Petriu School of Electrical Engineering and Computer Science University of Ottawa Ottawa Canada Engineering Division Larus Technologies Corporation Ottawa Canada University of Ottawa Faculty of Medicine Ottawa ON CA

Optimized task allocation in robotic sensor networks is a crucial yet complex problem. A successful allocation must efficiently and rapidly coordinate agents to resolve a greater objective while being resilient to incomplete contextual information. Prior work introduced a two-step task allocation process which first determines a set of suitable robots via an auction, then optimizes the task allocation for these agents with the use of multiobjective evolutionary algorithms. The first step has had success but often yields suboptimal sets in certain conditions, this limitation can be traced back to the auctioning protocol's simplicity, which then constraints the set of potential coalitions sought by the optimizer. We introduce two new auction protocols which are able to choose optimal agents. These protocols are resilient to communication failures, can rapidly determine optimal sets and can select agents based on multiple factors. A valuation system which renders agents aware of the value of entities is also introduced. Finally, a rigorous experimentation is designed to evaluated the performance of the different protocols in multiple scenarios. In the experiment, both proposed protocols in conjunction with the valuation system proved to be efficient methods to select appropriate agents. In both sparse and dense network scenarios, the proposed protocols performed better than the current implementation in terms of selecting appropriate coalitions, at the cost of time and network utilization.

关键词： Protocols Resource management Robot sensing systems Robot kinematics Cost accounting Wireless sensor networks

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Nonlinear partial least squares with Hellinger distance for nonlinear process monitoring

Nonlinear partial least squares with Hellinger distance for ...

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IEEE Symposium Series on Computational Intelligence (SSCI)

作者： Fouzi Harrou Muddu Madakyaru Ying Sun Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Computer Thuwal Saudi Arabia Department of Chemical Engineering Manipal University India

ISBN: (纸本)9781509042418

This paper proposes an efficient data-based anomaly detection method that can be used for monitoring nonlinear processes. The proposed method merges advantages of nonlinear projection to latent structures (NLPLS) modeling and those of Hellinger distance (HD) metric to identify abnormal changes in highly correlated multivariate data. Specifically, the HD is used to quantify the dissimilarity between current NLPLS-based residual and reference probability distributions. The performances of the developed anomaly detection using NLPLS-based HD technique is illustrated using simulated plug flow reactor data.

关键词： High definition video Monitoring Data models Measurement Probability distribution Computational modeling Predictive models

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Author Correction: The power of genetic diversity in genome-wide association studies of lipids

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Nature 2023年第7965期618卷 E19-E20页

作者： Sarah E Graham Shoa L Clarke Kuan-Han H Wu Stavroula Kanoni Greg J M Zajac Shweta Ramdas Ida Surakka Ioanna Ntalla Sailaja Vedantam Thomas W Winkler Adam E Locke Eirini Marouli Mi Yeong Hwang Sohee Han Akira Narita Ananyo Choudhury Amy R Bentley Kenneth Ekoru Anurag Verma Bhavi Trivedi Hilary C Martin Karen A Hunt Qin Hui Derek Klarin Xiang Zhu Gudmar Thorleifsson Anna Helgadottir Daniel F Gudbjartsson Hilma Holm Isleifur Olafsson Masato Akiyama Saori Sakaue Chikashi Terao Masahiro Kanai Wei Zhou Ben M Brumpton Humaira Rasheed Sanni E Ruotsalainen Aki S Havulinna Yogasudha Veturi QiPing Feng Elisabeth A Rosenthal Todd Lingren Jennifer Allen Pacheco Sarah A Pendergrass Jeffrey Haessler Franco Giulianini Yuki Bradford Jason E Miller Archie Campbell Kuang Lin Iona Y Millwood George Hindy Asif Rasheed Jessica D Faul Wei Zhao David R Weir Constance Turman Hongyan Huang Mariaelisa Graff Anubha Mahajan Michael R Brown Weihua Zhang Ketian Yu Ellen M Schmidt Anita Pandit Stefan Gustafsson Xianyong Yin Jian'an Luan Jing-Hua Zhao Fumihiko Matsuda Hye-Mi Jang Kyungheon Yoon Carolina Medina-Gomez Achilleas Pitsillides Jouke Jan Hottenga Gonneke Willemsen Andrew R Wood Yingji Ji Zishan Gao Simon Haworth Ruth E Mitchell Jin Fang Chai Mette Aadahl Jie Yao Ani Manichaikul Helen R Warren Julia Ramirez Jette Bork-Jensen Line L Kårhus Anuj Goel Maria Sabater-Lleal Raymond Noordam Carlo Sidore Edoardo Fiorillo Aaron F McDaid Pedro Marques-Vidal Matthias Wielscher Stella Trompet Naveed Sattar Line T Møllehave Betina H Thuesen Matthias Munz Lingyao Zeng Jianfeng Huang Bin Yang Alaitz Poveda Azra Kurbasic Claudia Lamina Lukas Forer Markus Scholz Tessel E Galesloot Jonathan P Bradfield E Warwick Daw Joseph M Zmuda Jonathan S Mitchell Christian Fuchsberger Henry Christensen Jennifer A Brody Mary F Feitosa Mary K Wojczynski Michael Preuss Massimo Mangino Paraskevi Christofidou Niek Verweij Jan W Benjamins Jorgen Engmann Rachel L Kember Roderick C Slieker Ken Sin Lo Nuno R Zilhao Phuong Le Marcus E Kleber Graciela E Delgado Shaofeng Huo Dai Department of Internal Medicine Division of Cardiology University of Michigan Ann Arbor MI USA. VA Palo Alto Health Care System Palo Alto CA USA. Department of Medicine Division of Cardiovascular Medicine Stanford University School of Medicine Stanford CA USA. Department of Computational Medicine and Bioinformatics University of Michigan Ann Arbor MI USA. William Harvey Research Institute Barts and the London School of Medicine and Dentistry Queen Mary University of London London UK. Department of Biostatistics and Center for Statistics Genetics University of Michigan Ann Arbor MI USA. Department of Genetics Perelman School of Medicine University of Pennsylvania Philadelphia PA USA. Clinical Pharmacology William Harvey Research Institute Barts and The London School of Medicine and Dentistry Queen Mary University of London London UK. Endocrinology Boston Children's Hospital Boston MA USA. Medical and Population Genetics Broad Institute Cambridge MA USA. Department of Genetic Epidemiology University of Regensburg Regensburg Germany. McDonnell Genome Institute and Department of Medicine Washington University St Louis MO USA. Department of Precision Medicine Division of Genome Science National Institute of Health Cheongju-si South Korea. Tohoku Medical Megabank Organization Tohoku University Sendai Japan. Sydney Brenner Institute for Molecular Bioscience Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa. Center for Research on Genomics and Global Health National Human Genome Research Institute National Institutes of Health Bethesda MD USA. Blizard Institute Barts and the London School of Medicine and Dentistry Queen Mary University of London London UK. Wellcome Sanger Institute Hinxton UK. Department of Epidemiology Emory University Rollins School of Public Health Atlanta GA USA. Atlanta VA Health Care System Decatur GA USA. Malcolm Randall VA Medical Center Gainesville FL USA. Division of Vascular Sur

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MARKOV DECISION PROCESS FOR SONOBUOY TRANSMISSION SCHEDULING

MARKOV DECISION PROCESS FOR SONOBUOY TRANSMISSION SCHEDULING

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International Conference on Information Fusion

作者： S. Suvorova F. Fletcher D. Angley H. Gaetjens S. Simakov M. Morelande B. Moran School of Electrical & Computer Engineering RMIT University Melbourne 3000 Australia Maritime Division Defence Science and Technology Group Edinburgh 5111 Australia

ISBN: (纸本)9781509020126

Assumed here is a multi-static sonar system consisting of a distributed field of emitter and receiver sonobuoys within a defined search area. The field is deployed to search for and estimate the location, heading, and speed of underwater targets within the search area. We describe a method for optimizing, over a long time horizon, choice of transmission locations, and of waveforms from a small waveform library to detect and estimate the states of multiple targets. The method used is based on Markov Decision Processes as a structure to describe the overall scheduling problem. The key innovations are in simplifications of the state space used in seeking the optimal schedule, which enable a computationally feasible algorithm.

关键词： Sonobuoy field Markov decision process

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Outage probability of dual-hop FSO fixed gain relay transmission systems

Outage probability of dual-hop FSO fixed gain relay transmis...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Emna Zedini Hamza Soury Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

ISBN: (纸本)9781509032556

In this paper, we analyze the end-to-end performance of dual-hop free-space optical (FSO) fixed gain relaying systems in the presence of atmospheric turbulence as well as pointing errors. More specifically, an exact closed-form expression for the outage probability is presented in terms of the bivariate Fox's H function that accounts for both heterodyne detection as well as intensity modulation with direct detection. At high signal-to-noise ratio (SNR) regime, we provide very tight asymptotic result for this performance metric in terms of simple elementary functions. By using dual-hop FSO relaying, we demonstrate a better system performance as compared to the single FSO link. Numerical and Monte-Carlo simulation results are provided to verify the accuracy of the newly proposed results, and a perfect agreement is observed.

关键词： Signal to noise ratio Relays Receivers Radio frequency Land mobile radio Adaptive optics Optical mixing

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On the construction of capacity-achieving lattice Gaussian codes

On the construction of capacity-achieving lattice Gaussian c...

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IEEE International Symposium on Information Theory

作者： Wael Alghamdi Walid Abediseid Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

ISBN: (纸本)9781509018079

In this paper, we propose a new approach to proving results regarding channel coding schemes based on construction-A lattices for the Additive White Gaussian Noise (AWGN) channel that yields new characterizations of the code construction parameters, i.e., the primes and dimensions of the codes, as functions of the block-length. The approach we take introduces an averaging argument that explicitly involves the considered parameters. This averaging argument is applied to a generalized Loeliger ensemble [1] to provide a more practical proof of the existence of AWGN-good lattices, and to characterize suitable parameters for the lattice Gaussian coding scheme proposed by Ling and Belfiore [3].

关键词： Lattices Random variables AWGN channels Encoding Zinc Upper bound

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Electronic Stuctures: Mechanically Guided Post‐Assembly of 3D Electronic Systems (Adv. Funct. Mater. 48/2018)

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Advanced Functional Materials 2018年第48期28卷

作者： Bong Hoon Kim Fei Liu Yongjoon Yu Hokyung Jang Zhaoqian Xie Kan Li Jungyup Lee Ji Yoon Jeong Arin Ryu Yechan Lee Do Hoon Kim Xueju Wang KunHyuck Lee Jong Yoon Lee Sang Min Won Nuri Oh Jeonghyun Kim Ju Young Kim Seong‐Jun Jeong Kyung‐In Jang Seungmin Lee Yonggang Huang Yihui Zhang John A. Rogers Department of Materials Science and Engineering Simpson Querrey Institute and Feinberg Medical School Center for Bio‐Integrated Electronics Northwestern University Evanston IL 60208 USA Center for Mechanics and Materials Center for Flexible Electronics Technology AML Department of Engineering Mechanics Tsinghua University Beijing 100084 China Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA Department of Civil and Environmental Engineering Mechanical Engineering and Materials Science and Engineering Northwestern University Evanston IL 60208 USA AML Department of Engineering Mechanics Center for Mechanics and Materials Tsinghua University Beijing 100084 China Division of Materials Science and Engineering Hanyang University Seoul 04763 Republic of Korea Department of Electronics Convergence Engineering Kwangwoon University Seoul 01897 Republic of Korea Multidisciplinary Sensor Research Group Electronics and Telecommunications Research Institute (ETRI) Daejeon 34129 Republic of Korea Department of Organic Materials and Fiber Engineering Department of Information Communication Materials and Chemistry Convergence Technology Soongsil University 369 Sangdo‐ro Dongjak‐gu Seoul 06978 Republic of Korea Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea Department of Energy Electronics Convergence Kookmin University Seoul 02707 Republic of Korea Department of Civil and Environmental Engineering Mechanical Engineering Materials Science and Engineering Northwestern University Evanston IL 60208 USA Department of Materials Science and Engineering Department of Biomedical Engineering Department of Chemistry Department of Neurological Surgery Department of Mechanical Engineering Department of Electrical Engineering and Computer Science Simpson Querrey Institute and Feinberg Medical School Center for Bio‐Integrated Electronics Northwestern University Evanston IL 60208 USA

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