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arXiv 2024年

作者： Pope, Simon A. Roth, Diane J. Bansal, Aakash Mousa, Mostafa Rezanejad, Ashkan Forte, Antonio E. Nash, Geoff.R. Singleton, Lawrence Langfeldt, Felix Cheer, Jordan Henthorn, Stephen Hooper, Ian R. Hendry, Euan Powell, Alex W. Souslov, Anton Plum, Eric Sun, Kai de Groot, C.H. Muskens, Otto L. Shields, Joe De Galarreta, Carlota Ruiz Wright, C. David Kocabas, Coskun Ergoktas, M. Said Xiao, Jianling Schulz, Sebastian A. Di Falco, Andrea Krasavin, Alexey V. Zayats, Anatoly V. Galiffi, Emanuele Department of Automatic Control and Systems Engineering The University of Sheffield Amy Johnson Building Portobello Street SheffieldS1 3JD United Kingdom Department of Physics London Centre for Nanotechnology King’s College London Strand WC2R 2LS United Kingdom Wolfson School of Mechanical Electrical and Manufacturing Engineering Loughborough University United Kingdom Department of Engineering King’s College London LondonWC2R 2LS United Kingdom Natural Sciences University of Exeter Harrison Building North Park Road Exeter United Kingdom Institute of Sound & Vibration Research University of Southampton University Road Southampton United Kingdom Department of Electronic and Electrical Engineering University of Sheffield Sheffield United Kingdom Centre for Metamaterial Research and Innovation University of Exeter Stoker Road ExeterEX4 4QL United Kingdom T.C.M. Group Cavendish Laboratory University of Cambridge CambridgeCB3 0HE United Kingdom Optoelectronics Research Centre Centre for Photonic Metamaterials University of Southampton Highfield SouthamptonSO17 1BJ United Kingdom School of Physics and Astronomy University of Southampton Southampton United Kingdom Electronics and Computer Science University of Southampton Southampton United Kingdom Institute of Materials Science of Barcelona Universitat Autònoma de Barcelona Bellaterra Barcelona08193 Spain Department of Materials National Graphene Institute University of Manchester United Kingdom Schoolof Physics and Astronomy University of St Andrews North Haugh Fife St. AndrewsKY16 9SS United Kingdom Department of Electrical and Computer Engineering University of Waterloo 200 University Avenue West WaterlooONN2L 3G1 Canada Photonics Initiative Advanced Science Research Centre City University of New York 85 St. Nicholas Terrace New YorkNY10027 United States

Active metamaterials are engineered structures that possess novel properties that can be changed after the point of manufacture. Their novel properties arise predominantly from their physical structure, as opposed to their chemical composition and can be changed through means such as direct energy addition into wave paths, or physically changing/morphing the structure in response to both a user or environmental input. Active metamaterials are currently of wide interest to the physics community and encompass a range of sub-domains in applied physics (e.g. photonic, microwave, acoustic, mechanical, etc.). They possess the potential to provide solutions that are more suitable to specific applications, or which allow novel properties to be produced which cannot be achieved with passive metamaterials, such as time-varying or gain enhancement effects. They have the potential to help solve some of the important current and future problems faced by the advancement of modern society, such as achieving net-zero, sustainability, healthcare and equality goals. Despite their huge potential, the added complexity of their design and operation, compared to passive metamaterials creates challenges to the advancement of the field, particularly beyond theoretical and lab -based experiments. This roadmap brings together experts in all types of active metamaterials and across a wide range of areas of applied physics. The objective is to provide an overview of the current state of the art and the associated current/future challenges, with the hope that the required advances identified create a roadmap for the future advancement and application of this field. Copyright © 2024, The Authors. All rights reserved.

关键词： Microwave acoustics

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An intelligent road traffic data management for upgrading real time performance

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AIP Conference Proceedings 2022年第1期2426卷

作者： MD. Rafeeq V. Harsha Shastri Ba Anandh V. Shanmugasundaram Prathipati Ratna Kumar D. Jyothsna 1Department of Computer Science and Engineering Koneru Lakshmaiah Education Foundation Hyderabad Telangana India. 2Department of Computer Science Department Of Computer Science and Engineering Loyola Academy Secunderabad-500010 Telangana India 3Department of Electronics PSG College of Arts & Science Coimbatore - 641 014 Tamilnadu India. 4Department of Electrical and Electronics Engineering Sona College of Technology Salem - 636005 Tamilnadu India.

The distributed road traffic simulation is an important tool for control and analysis of large road traffic networks (e.g., an entire city or even state). For performing the simulation, it is necessary to divide the simulated road traffic network into sub networks, which are then simulated as processes on computers (nodes) of the distributed computer. To ensure a good performance of the distributed road traffic simulation, two aspects should be considered during the division of the road traffic network - the load-balancing of the resulting sub-networks and the minimization of the inter process communication [1, 2]. Legacy transportation systems are among the most important systems that need to be addressed in a proper manner. Congestion is considered as one of the common problems, especially during peak times of the day because of the weakness of the absorptive capacity of the roads network and the inefficiency of the transportation system to meet the required demands of the increasing traffic size

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On stable difference scheme for identification elliptic problem with integral and second kind boundary condition

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AIP Conference Proceedings 2021年第1期2334卷

作者： Charyyar Ashyralyyev 1Department of Mathematical Engineering Gumushane University 29100 Gumushane Turkey 2Department of Computer Technology TAU Ashgabat 744000 Turkmenistan

In this study, the first order of accuracy difference scheme for approximate solution of source identification elliptic problem with integral and second kind boundary conditions is considered. Stability and coercive stability estimates for solution of the difference scheme are described. Moreover, test example with computation results is given.

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Creating a cost-effective network of operational resources for wireless networks

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AIP Conference Proceedings 2023年第1期2523卷

作者： Venkateshwara Prasad Bhadrappa Haralayya R. Aruna Jayashree A. Kethsy Prabavathy S. Selvarasu 1Department of Management Studies Sri Sairam Engineering College Chennai Tamil Nadu India. 2Department of Management Studies Lingaraj Appa Engineering College Bidar Karnataka India. 3Department of Electronics and Communication Engineering Rajalakshmi Institute of Technology Chennai Tamil Nadu India. 4Department of Computer Science and Engineering Karunya Institute of Technology and Sciences Coimbatore Tamil Nadu India. 5Department of Electronics and Communication Engineering Muthayammal Engineering College Tamil Nadu India

Wireless Sensor Networks (WSNs) gives human civilization a stunning and clever landscape. Connections between different sensors also strategies in the Internet of Things (IoT) contribute to high energy feasting. Study into liveliness conservation and methods of energy-saving are also important. Sustainability in an energy-efficient way due to the sensors' partial power is important for wireless sensors in an IoT network. This paper aims to analyze an IoT network of remote monitoring and access points. Wireless battery charging power delivery methods are getting more mature. The electrical power supply is operated by a charging car for wireless sensors. The data sharing of the IoT network situation is a minimization challenge to conserve electric energy. A three-stage process obtains the solution. A Reboot Artificial Bee Community (RABC) approach is proposed to solve the sub-problems of the data transfer model. The RABC approach has been shown to converge asymptotically to the optimization process. computer modelling demonstrates that energy consumption can be reduced with a strong, robust function using the proposed approach in the intentional network scenario.

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Stability estimates for a third order of accuracy difference scheme elliptic overdetermined multi-point problem

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AIP Conference Proceedings 2021年第1期2334卷

作者： Charyyar Ashyralyyev Gulzipa Akyuz 1Department of Mathematical Engineering Gumushane University 29100 Gumushane Turkey 2Department of Computer Technology TAU Ashgabat 744000 Turkmenistan

In this work, we discuss a third order of accuracy difference scheme for approximate solution of the elliptic overdeter-mined multi-point problem in the Hilbert space. Functional operator approach is used to study existence and uniqueness of solution of difference problem. Stability, almost coercive stability and coercive stability estimates for solution of difference scheme are established.

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An improved E-passport system with secured IoT and wireless communication technology

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AIP Conference Proceedings 2022年第1期2452卷

作者： T. Vignesh K. K. Thyagharajan R. Beaulah Jeyavathana Prasanna Kumar R. 1Department of Computer Science and Engineering Koneru Lakshmaiah Education Foundation Vaddeswaram Andhra Pradesh India 2Department of ECE R.M.D Engineering College Chennai India 3Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Thandalam Chennai India 4Department of Computer Science and Engineering Amrita School of Engineering Amrita Vishwa Vidyapeetham Chennai India

A stepped forward E-Passports with IoT devices assumes an essential element in momentum research. Additionally, getting the data, placed away on E-Passport is also an essential difficulty. In this paper, we've got proposed a stepped forward far- off E-Visa framework with simple stage protection. The number one aim of this advanced system is to devise and foster an excessive stage tremendous far-off identity and Savvy card which conveys the identity subtleties and visa limits. Radio Frequency Identification (RFID) is a programmed ID innovation this is using Radio recurrence signals. Utilizing RFID labels as opposed to identity and visa information to conquer the paper works and document lacking difficulty with IoT devices improvements the superior protection highlights of an identity. Also, this advanced system provides high level security in customer information storage.

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Erratum: “Rare earth-implanted lithium niobate: Properties and on-chip integration” [Appl. Phys. Lett. 115, 071104 (2019)]

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Applied Physics Letters 2022年第9期120卷

作者： Xiaodong Jiang Dongmin Pak Arindam Nandi Yi Xuan Mahdi Hosseini 1Birck Nanotechnology Center School of Electrical and Computer Engineering Purdue University West Lafayette Indiana 47907 USA 2Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA

The authors would like to add one affiliation for two of the authors of the original version of the published article.1 Affiliation to the department of Physics

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3D Hierarchical Refinement and Augmentation for Unsupervised Learning of Depth and Pose from Monocular Video

arXiv

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arXiv 2021年

作者： Wang, Guangming Zhong, Jiquan Zhao, Shijie Wu, Wenhua Liu, Zhe Wang, Hesheng Department of Automation Institute of Medical Robotics Key Laboratory of System Control and Information Processing Ministry of Education Key Laboratory of Marine Intelligent Equipment and System of Ministry of Education Shanghai Engineering Research Center of Intelligent Control and Management Shanghai Jiao Tong University Shanghai200240 China Department of Engineering Mechanics Shanghai Jiao Tong University Shanghai200240 China Department of Computer Science and Technology University of Cambridge CambridgeCB2 1TN United Kingdom

Depth and ego-motion estimations are essential for the localization and navigation of autonomous robots and autonomous driving. Recent studies make it possible to learn the per-pixel depth and ego-motion from the unlabeled monocular video. A novel unsupervised training framework is proposed with 3D hierarchical refinement and augmentation using explicit 3D geometry. In this framework, the depth and pose estimations are hierarchically and mutually coupled to refine the estimated pose layer by layer. The intermediate view image is proposed and synthesized by warping the pixels in an image with the estimated depth and coarse pose. Then, the residual pose transformation can be estimated from the new view image and the image of the adjacent frame to refine the coarse pose. The iterative refinement is implemented in a differentiable manner in this paper, making the whole framework optimized uniformly. Meanwhile, a new image augmentation method is proposed for the pose estimation by synthesizing a new view image, which creatively augments the pose in 3D space but gets a new augmented 2D image. The experiments on KITTI demonstrate that our depth estimation achieves state-of-the-art performance and even surpasses recent approaches that utilize other auxiliary tasks. Our visual odometry outperforms all recent unsupervised monocular learning-based methods and achieves competitive performance to the geometry-based method, ORB-SLAM2 with back-end optimization. Copyright © 2021, The Authors. All rights reserved.

关键词： Robots

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Modeling of the pernicious chemical sensor in the terahertz regime

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AIP Conference Proceedings 2022年第1期2357卷

作者： Etu Podder Md. Bellal Hossain Md. Ekhlasur Rahaman Abdullah Al-Mamun Bulbul Rayhan Habib Jibon Sajib Kabiraj M. Raihan 1Electronics and Communication Engineering Discipline Khulna University Khulna-9208 Bangladesh 2Department of Electronics and Telecommunication Engineering (ETE) Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj Bangladesh 3Department of Computer Science and Engineering North Western University Khulna Bangladesh

Several chemicals are dangerously injurious to the breathing system of human being and so, the exact diagnosis of the pernicious chemicals is essential. Therefore, we present a PCF sensor to detect these pernicious chemicals such as Sarin, Soman, Tabun and in this work, Zeonex is considered as bulk material. The COMSOL Multiphysics V-5.5 is used to design and analysis of the sensor model and the investigation of the proposed sensor’s performance is accomplished by shifting the terahertz frequency. We have found that relatively enhanced sensitivity (almost 90.93%, 92.39%, and 94.12 % for Sarin, Soman, and Tabun at 2.5 THz) with negligible light confinement loss (around 1.043e×10-14 cm-1, 7.62×10−15 cm−1, and 6.15×10-15 cm-1 for Sarin, Soman, and Tabun at 2.5 THz) is achieved by the sensor which the foremost requirement to provide the best performance by any biosensor or chemical sensor. Besides, the existing modern fabrication technologies can be applied to fabricate the sensor.

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Doppler Shift and Channel Estimation for Intelligent Transparent Surface Assisted Communication Systems on High-Speed Railways

arXiv

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arXiv 2022年

作者： Wang, Yirun Wang, Gongpu He, Ruisi Ai, Bo Tellambura, Chintha The School of Information and Electronics Beijing Institute of Technology Beijing100081 China The Beijing Key Laboratory of Transportation Data Analysis and Mining Beijing Jiaotong University Beijing100044 China The State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China The Department of Electrical and Computer Engineering University of Alberta EdmontonABT6G 2V4 Canada

The critical distinction between the emerging intelligent transparent surface (ITS) and intelligent reflection surface (IRS) is that the incident signals can penetrate the ITS instead of being reflected, which enables the ITS to combat the severe signal penetration loss for high-speed railway (HSR) wireless communications. This paper thus investigates the channel estimation problem for an ITS-assisted HSR network where the ITS is embedded into the carriage window. We first formulate the channels as functions of physical parameters, and thus transform the channel estimation into a parameter recovery problem. Next, we design the first two pilot blocks within each frame and develop a serial low-complexity channel estimation algorithm. Specifically, the channel estimates are initially obtained, and each estimate is further expressed as the sum of its perfectly known value and the estimation error. By leveraging the relationship between channels for the two pilot blocks, we recover the Doppler shifts from the channel estimates, based on which we can further acquire other channel parameters. Moreover, the Cramér-Rao lower bound (CRLB) for each parameter is derived as a performance benchmark. Finally, we provide numerical results to establish the effectiveness of our proposed estimators. Copyright © 2022, The Authors. All rights reserved.

关键词： Doppler effect

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