检索结果-内蒙古大学图书馆

Single-layer dual-band frequency selective surface for coverage-enhancing applications in millimeter-wave 5G

Results in Engineering 2025年 27卷

作者： Mousa Abdollahvand Eduardo Martinez-de-Rioja Kanishka Katoch Ana Arboleya Celia Fontá Department of Electrical and Computer Engineering University of Mohaghegh Ardabili Ardabil Iran Department of Signal Theory and Communications and Telematic Systems and Computing Universidad Rey Juan Carlos 28942 Fuenlabrada Spain Department of Electronics and Communication Engineering JUIT Waknaghat Solan Himachal Pradesh India Information Processing and Telecommunications Center Department of Signals Systems and Radiocommunications Universidad Politecnica de Madrid 28040 Madrid Spain

This work presents a dual-band Frequency Selective Surface (FSS) for improving 5G communications at millimeter-wave bands. The FSS is based on a single-layer configuration which supports dual polarization, with a unit-cell period of 4 mm x 4 mm. The structure exhibits two reflection bands at 28 GHz and 39 GHz. An equivalent circuit model has been developed for the proposed FSS, showing good agreement with full-wave electromagnetic simulations. A 200 mm x 200 mm prototype of the FSS, comprising an array of 50 × 50 unit-cells has been fabricated and tested, and the measured transmission and reflection coefficients agree well with the simulations. Moreover, the frequency response of the FSS shows good stability for incidence angles up to 40°. The proposed single-layer dual-band FSS has applications in the design of smart reflecting surfaces to enhance wireless communications in 5G networks operating at the 28 and 39 GHz bands, either alone or in combination with metasurface or reflectarray elements that could be placed on its upper side.

关键词： 5G communications Coverage enhancement Dual band Electromagnetic skin Frequency selective surface Millimeter waves

来源：评论

学校读者我要写书评

暂无评论

The value of headphone accommodations in Apple Airpods Pro for managing speech-in-noise hearing difficulties of individuals with normal audiograms

引用

International Audiology 2024年第6期63卷

作者： Joaquin T. Valderrama Jorge Mejia Angela Wong Nicky Chong-White Brent Edwards a National Acoustic Laboratories Sydney Australiab Department of Linguistics Macquarie University Sydney Australiac Department of Signal Theory Telematics and Communications University of Granada Granada Spaind Research Centre for Information and Communications Technologies (CITIC-UGR) University of Granada Granada Spain a National Acoustic Laboratories Sydney Australiae School of Computing Macquarie University Sydney Australia a National Acoustic Laboratories Sydney Australia a National Acoustic Laboratories Sydney Australiab Department of Linguistics Macquarie University Sydney Australia

ObjectiveTo investigate the extent to which Headphone Accommodations in Apple AirPods Pro attend to the hearing needs of individuals with normal audiograms who experience hearing difficulties in noisy ***-arm interventional study using acoustic measures, speech-in-noise laboratory testing, and real-world measures via questionnaires and ecological momentary *** sampleSeventeen normal-hearing individuals (9 female, 21–59 years) with self-reported hearing-in-noise *** measures showed that, relative to unaided, AirPods Pro provided a SNR advantage of +5.4 dB. Speech intelligibility performance in laboratory testing increased 11.8% with AirPods Pro, relative to unaided. On average, participants trialling AirPods Pro in real-world noisy venues reported that their overall hearing experience wasa bit betterthan without them. Five participants (29%) reported that they would continue using AirPods Pro in the future. The most relevant barriers that would discourage their future use were limited hearing benefit, discomfort, and *** use of AirPods Pro may help some individuals with normal audiograms ameliorate their speech-in-noise hearing difficulties. The identified barriers may inspire the development of new technological solutions aimed at providing an optimal management strategy for the hearing difficulties of this segment of the population.

关键词： Hearables hidden hearing loss over-the-counter hearing aids listening effort communication difficulties

来源：评论

学校读者我要写书评

暂无评论

An Evolutionary Edge computing Architecture for the Beyond 5G Era

An Evolutionary Edge Computing Architecture for the Beyond 5...

引用

IEEE International Workshop on Computer-Aided Modeling, Analysis, and Design of Communication Links and Networks, CAMAD

作者： Elli Kartsakli Jordi Perez-Romero Nikolaos Bartzoudis Oriol Sallent Oluwatayo Kolawole Xin Tao Swarup Kumar Mohalik Tomasz Mach Sige Liu Yansha Deng Gianluca Mandò Angelos Antonopoulos Valerio Frascolla Semiha Kosu Gökhan Kalem Fred Buining Eduardo Quiñones Barcelona Supercomputing Center (BSC) Barcelona Spain Signal Theory and Communications Dpt. Universitat Politècnica de Catalunya (UPC) Barcelona Spain Telecommunications Technological Center of Catalonia (CTTC) Barcelona Spain Samsung R&D Institute Staines United Kingdom Ericsson Research Stockholm Sweden Department of Engineering King’s College London (KCL) London United Kingdom Ground Transportation Systems Italia SRL Sesto Fiorentino Italy Nearby Computing S.L. Barcelona Spain Intel Neubiberg Germany Turkcell Technology Istanbul Turkey HIRO-MicroDataCenters BV Netherlands

Beyond 5G (B5G) communication networks face the challenge of meeting the demanding requirements of various service types, including uRLLC, mIoT, eMBB, and emerging technologies like Extended Reality (XR). Edge computing can address these demands effectively because of the ability to bring computational power and resources closer to the source of data. Nevertheless, the realization of this potential necessitates an open, flexible, and automated architectural framework capable of supporting disaggregated applications and network designs. In this context, this paper introduces a novel architecture designed to advance the evolution of edge computing in B5G, developed within the EU-funded project VERGE. The proposed architecture is modular and scalable, guided by artificial intelligence (AI), and founded on three essential pillars: “edge for AI,“ “AI for edge,“ and “security, privacy, and trustworthiness for AI.“ After presenting this architecture, the paper showcases its applicability through the examination of two vertical use cases within the industrial and transportation domains.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Glide-symmetric holey structures with selected bandgaps for gap-waveguide technology 12

Glide-symmetric holey structures with selected bandgaps for ...

引用

12th European Conference on Antennas and Propagation, EuCAP 2018

作者： Padilla, Pablo Palomares, Angel Alex-Amor, Antonio Valenzuela-Valdés, Juan Fernandez-Gonzalez, J.M. Quevedo-Teruel, Oscar Department of Signal Theory Telematics and Communications University of Granada-CITIC Granada Spain Department of Signals Systems and Radiocommunications Technical University of Madrid Madrid Spain Department of Electromagnetic Engineering KTH Royal Institute of Technology Stockholm Sweden

ISBN: (纸本)9781785617911

Here, we propose a new technique to accurately define and select the bandgap regions in gap waveguide technology based on glide-symmetric holey structures. This selection is accomplished by breaking the symmetry of the periodic structure. The advantage of this proposal is that filtering properties are added intrinsically in the waveguides, reducing the total complexity of the overall device, in which additional filters may not be necessary. © Institution of Engineering and *** Rights Reserved.

关键词： Energy gap

来源：评论

学校读者我要写书评

暂无评论

All sparse PCA models are wrong, but some are useful. Part I: Computation of scores, residuals and explained variance

arXiv

引用

arXiv 2019年

作者： Camacho, J. Smilde, A.K. Saccenti, E. Westerhuis, J.A. Department of Signal Theory Telematics and Communications School of Computer Science and Telecommunications - CITIC University of Granada Granada Spain Biosystems Data Analysis University of Amsterdam Amsterdam Netherlands Laboratory of Systems and Synthetic Biology Wageningen University & Research Wageningen Netherlands

Sparse Principal Component Analysis (sPCA) is a popular matrix factorization approach based on Principal Component Analysis (PCA) that combines variance maximization and sparsity with the ultimate goal of improving data interpretation. When moving from PCA to sPCA, there are a number of implications that the practitioner needs to be aware of. A relevant one is that scores and loadings in sPCA may not be orthogonal. For this reason, the traditional way of computing scores, residuals and variance explained that is used in the classical PCA cannot directly be applied to sPCA models. This also affects how sPCA components should be visualized. In this paper we illustrate this problem both theoretically and numerically using simulations for several state-of-the-art sPCA algorithms, and provide proper computation of the different elements mentioned. We show that sPCA approaches present disparate and limited performance when modeling noise-free, sparse data. In a follow-up paper, we discuss the theoretical properties that lead to this problem. Copyright © 2019, The Authors. All rights reserved.

关键词： Principal component analysis

来源：评论

学校读者我要写书评

暂无评论

MO813ANALYSING TRANSITIONS IN THE INTEGRATED MODEL OF RENAL REPLACEMENT THERAPY IN A REGIONAL HEALTH SYSTEM

引用

Nephrology Dialysis Transplantation 2021年第SUPPLEMENT_1期36卷

作者： Gil-Casares Casanova, Beatriz Portoles, Jose López, Paula Tornero Molina, Fernando Marques Vidas, Maria Rojo Alvarez, Jose Luis Hospital Universitario del Sureste Department of Nephrology Arganda del Rey. Madrid Spain Universidad Rey Juan Carlos Department of Communications Signal Theory and Telematic and Computing Systems Fuenlabrada. Madrid Spain Hospital Universitario Puerta de Hierro Department of Nephrology Majadahonda. Madrid Spain

来源：评论

学校读者我要写书评

暂无评论

Correction: Comparison of Omegawave Device and an Ambulatory ECG for RR Interval Measurement at rest

引用

International journal of sports medicine 2020年第14期41卷 e19页

作者： José Naranjo-Orellana José Francisco Ruso-Álvarez José Luis Rojo-Álvarez Department of Sports and Computing Pablo de Olavide University Sevilla Spain. Department of Signal Theory and Communications and Telematic Systems and Computation Universidad Rey Juan Carlos Madrid Spain.

来源：评论

学校读者我要写书评

暂无评论

Study of Correlation and Power Imbalance on the MIMO Distributed System

Study of Correlation and Power Imbalance on the MIMO Distrib...

引用

European Conference on Antennas and Propagation

作者： J. C. Gonzalez-Macias J. F. Valenzuela-Valdes P. Padilla J. Carmona-Murillo Department of Computer and Telematic Systems Engineering University of Extremadura Department of Signal Theory Telematics and Communications - CITIC University of Granada

ISBN: (纸本)9781509037421

This work is focused on achieving large performance gains in wireless networks by means of distributed or cooperative Multiple Input Multiple Output (MIMO) systems. In this contribution, it is studied in detail the correlation of different Cooperative MIMO systems, based on measuring these systems on a reverberation chamber. Cooperative systems with more than 10 antennas are studied in detail. These results show the impact of these new propagation channels on the 5th generation mobile communication systems, which will be of importance for the development and characterization of such systems. In this new systems power imbalance acquires more importance.

关键词： MIMO systems Propagation channel Capacity measurement multiple input multiple output systems Capacitors Distributed systems Wireless networks

来源：评论

学校读者我要写书评

暂无评论

An improved secure image transmission technique via mosaic images by nearly reversible color transformations 14

An improved secure image transmission technique via mosaic i...

引用

14th International Joint Conference on e-Business and Telecommunications, ICETE 2017

作者： Buenaño, Freddy Acosta Cifuentes, Gonzalo Olmedo Mora-Jiménez, Inmaculada Álvarez, José Luis Rojo Departamento de Eléctrica y Electrónica Universidad de las Fuerzas Armadas ESPE Av. General Rumiñahui s/n Sangolquí171-5-231B Ecuador Department of Signal Theory and Communications Telematics and Computing Universidad Rey Juan Carlos Madrid28943 Spain

ISBN: (纸本)9789897582608

Current multimedia communication systems seek to transmit images supporting contents by the data stream, which requires specific effort for their bandwidth optimization. In this scenario, security of data and information that is being transmitted is highly relevant. A new concept has been recently used in the field of secure image transmission, known as secret-fragment-visible mosaic image. In this case, a mosaic image is created and used as a camouflage for a secret image. The mosaic image is similar to a target image freely chosen. We propose here a technique based on a statistical simplification approach to reduce the number of required bits for recovering the secret image from the mosaic image. We benchmarked the performance of the method and the quality of the recovered image. Experimental results showed that the number of bits with the proposed method was dramatically reduced (close to 3 to 1), and quality metrics were about Root Mean Squared Error of 32 and Mean Structural Similarity of 0.7 for the created mosaic image. Our proposal paves the way towards improved procedures that are suitable for multimedia systems like digital terrestrial television and similar applications. © Copyright 2017 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.

关键词： Security of data

来源：评论

学校读者我要写书评

暂无评论

On the feasibility of distinguishing between process disturbances and intrusions in process control systems using multivariate statistical process control

arXiv

引用

arXiv 2017年

作者： Iturbe, Mikel Camacho, José Garitano, Iñaki Zurutuza, Urko Uribeetxeberria, Roberto Department of Electronics and Computing Faculty of Engineering Mondragon University Arrasate-MondragónE-20500 Spain Department of Signal Theory Telematics and Communications - CITIC University of Granada GranadaE-18071 Spain

Process Control systems (PCSs) are the operating core of Critical Infrastructures (CIs). As such, anomaly detection has been an active research field to ensure CI normal operation. Previous approaches have leveraged network level data for anomaly detection, or have disregarded the existence of process disturbances, thus opening the possibility of mislabelling disturbances as attacks and vice versa. In this paper we present an anomaly detection and diagnostic system based on Multivariate Statistical Process Control (MSPC), that aims to distinguish between attacks and disturbances. For this end, we expand traditional MSPC to monitor process level and controller level data. We evaluate our approach using the Tennessee-Eastman process. Results show that our approach can be used to distinguish disturbances from intrusions to a certain extent and we conclude that the proposed approach can be extended with other sources of data for improving results. Copyright © 2017, The Authors. All rights reserved.

关键词： Anomaly detection

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：