检索结果-内蒙古大学图书馆

New Delay Doppler Communication Paradigm in 6G Era:A Survey of Orthogonal Time Frequency Space(OTFS)

China Communications 2023年第6期20卷 1-25页

作者： Weijie Yuan Shuangyang Li Zhiqiang Wei Yuanhao Cui Jiamo Jiang Haijun Zhang Pingzhi Fan Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhenChina Faculty of Electrical Engineering and Computer Science Technical University of BerlinBerlinGermany School of Mathematics and Statistics Xi’an Jiaotong UniversityXi’anChina Department of Communication Engineering Beijing University of Posts and TelecommunicationsBeijingChina China Academy of Information and Communications Technology BeijingChina School of Computer and Communication Engineering University of Science and Technology BeijingBeijingChina School of Information Science and Technology Southwest Jiaotong UniversityChengduChina

In the 6G era,Space-Air-Ground Integrated Network(SAGIN)are anticipated to deliver global coverage,necessitating support for a diverse array of emerging applications in high-mobility,hostile *** such conditions,conventional orthogonal frequency division multiplexing(OFDM)modulation,widely employed in cellular and Wi-Fi communication systems,experiences performance degradation due to significant Doppler *** overcome this obstacle,a novel twodimensional(2D)modulation approach,namely orthogonal time frequency space(OTFS),has emerged as a key enabler for future high-mobility use ***,OTFS modulates information within the delay-Doppler(DD)domain,as opposed to the timefrequency(TF)domain utilized by *** offers advantages such as Doppler and delay resilience,reduced signaling latency,a lower peak-to-average ratio(PAPR),and a reduced-complexity *** studies further indicate that the direct interplay between information and the physical world in the DD domain positions OTFS as a promising waveform for achieving integrated sensing and communications(ISAC).In this article,we present an in-depth review of OTFS technology in the context of the 6G era,encompassing fundamentals,recent advancements,and future *** objective is to provide a helpful resource for researchers engaged in the field of OTFS.

关键词： OTFS 6G delay-Doppler(DD)domain

来源：评论

学校读者我要写书评

暂无评论

SUBSPACE METHOD OF MOMENTS FOR AB INITIO 3-D SINGLE-PARTICLE CRYO-EM RECONSTRUCTION

arXiv

引用

arXiv 2024年

作者： Hoskins, Jeremy Khoo, Yuehaw Mickelin, Oscar Singer, Amit Wang, Yuguan Departments of Statistics and CCAM University of Chicago Chicago IL 60637 USA Departments of Statistics and CCAM University of Chicago Chicago IL 60637 USA Program in Applied and Computational Mathematics Princeton University Princeton NJ 08544 USA Program in Applied and Computational Mathematics and Department of Mathematics Princeton University Princeton NJ 08544 USA Departments of Statistics University of Chicago Chicago IL 60637 USA

Cryo-electron microscopy (Cryo-EM) is a widely-used technique for recovering the 3-D structure of biological molecules from a large number of experimentally generated noisy 2-D tomographic projection images of the 3-D structure, taken from unknown viewing angles. Through computationally intensive algorithms, these observed images are processed to reconstruct the 3-D structures. Many popular computational methods rely on estimating the unknown angles as part of the reconstruction process, which becomes particularly challenging at low signal-to-noise ratio. The method of moments (MoM) offers an alternative approach that circumvents the estimation of viewing angles of individual projection images by instead estimating the underlying distribution of the viewing angles, and is robust to noise given sufficiently many images. However, the method of moments typically entails computing high-order moments of the projection images, incurring significant storage and computational costs. To mitigate this, we propose a new approach called the subspace method of moments (subspace MoM), which compresses the first three moments using data-driven low-rank tensor techniques as well as expansion into a suitable function basis. The compressed moments can be efficiently computed from the set of projection images using numerical quadrature and can be employed to jointly recover the 3-D structure and the distribution of viewing angles. We illustrate the practical applicability of the subspace MoM in numerical experiments using up to the third-order moment, which significantly improves the resolution of MoM reconstructions compared to previous approaches. Copyright © 2024, The Authors. All rights reserved.

关键词： Image reconstruction

来源：评论

学校读者我要写书评

暂无评论

A SHORT PROOF OF ISSERLIS’ THEOREM

arXiv

引用

arXiv 2025年

作者： Munthe-Kaas, Hans Z. Verdier, Olivier Vilmart, Gilles Department of Mathematics and Statistics UiT – The Arctic University of Norway Tromsø Norway Department of Mathematics University of Bergen Bergen Norway Department of Computing Electrical Engineering and Mathematical Sciences Western Norway Norway University of Applied Sciences Bergen Norway Section of Mathematics University of Geneva Switzerland

We show that Isserlis’ theorem follows as a corollary to the invariant tensor theorem for isotropic *** Codes Primary: 60C05, 15A72, Secondary: 41A58, 60H35 Copyright © 2025, The Authors. All rights reserved.

关键词： Tensors

来源：评论

学校读者我要写书评

暂无评论

Detecting Confounders in Multivariate Time Series using Strength of Causation

Detecting Confounders in Multivariate Time Series using Stre...

引用

European Signal Processing Conference (EUSIPCO)

作者： Yuhao Liu Chen Cui Daniel Waxman Kurt Butler Petar M. Djurić Department of Applied Mathematics and Statistics Department of Electrical and Computer Engineering Stony Brook University NY

One of the most important problems in science is understanding causation. This is particularly challenging when one has access to observational data only and is further compounded in the presence of latent confounders. In this paper, we propose a method for detecting confounders in multivariate time series using a recently introduced concept referred to as differential causal effect (DCE). The solution is based on feature-based Gaussian processes that are used for estimating both, the DCE of the observed time series and the latent confounders. We demonstrate the performance of the proposed method with several examples. They show that the proposed approach can detect confounders and can accurately estimate causal strengths.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Shape from Shading under changing Illumination using a CNN

Shape from Shading under changing Illumination using a CNN

引用

International Conference on Image and Vision Computing New Zealand, IVCNZ

作者： Keetley Rate Richard Green Department of Mathematics and Statistics University of Canterbury Department of Computer Science and Software Engineering University of Canterbury

This paper presents an alternative method to the classical yet foundational problem of recovering the geometry of a 3D object from a single 2D brightness image, i.e., shape-from-shading. Drawing inspiration from traditional approaches and recent work in single-image 3D reconstruction, we employ a convolutional neural network trained on synthetic images of characteristic shapes as well as high-frequency surfaces to address the shape-from-shading problem. Although the resulting network is less accurate than non-deep learning (DL) approaches, it exhibits greater resilience to common pitfalls, such as variations in light source direction and the presence of noise in the input image.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Experimental Investigation of Pedestrians Interacting with E-Scooter Riders on Residential Roads 15

Experimental Investigation of Pedestrians Interacting with E...

引用

15th International Conference on Emerging Ubiquitous Systems and Pervasive Networks / 14th International Conference on Current and Future Trends of Information and Communication Technologies in Healthcare, EUSPN/ICTH 2024

作者： Hussain, Zahid Dias, Charitha Samson, Christian Hussain, Qinaat Alhajyaseen, Wael Abbasi, Saddam Akber Hussain, Iqtadar Qatar Transportation and Traffic Safety Center College of Engineering Qatar University PO Box. 2713 Doha Qatar Department of Civil and Environmental Engineering College of Engineering Qatar University PO Box. 2713 Doha Qatar Department of Mathematics and Statistics College of Arts and Sciences/ Qatar University PO Box. 2713 Doha Qatar

The integration of e-scooters in urban environments particularly on residential sidewalks has raised significant concerns about pedestrian safety and comfort. Therefore, it is crucial to understand pedestrian behaviour when interacting with e-scooters on residential sidewalks. This study aimed to examine pedestrians' avoidance behaviour while interacting with e-scooter riders traveling at different speed levels and positions on residential sidewalks. A total of 75 participants took part in an experimental study conducted in a virtual reality (VR) environment. The results showed that the position and speed of the e-scooter has a significant impact on pedestrian behaviour. The lowest side personal space between the participant and the e-scooter was observed when the approaching e-scooter was in the centre of the sidewalk. In addition, higher side personal space at 30 km/h was observed when the e-scooter was on either side of the sidewalk. Front personal space was greater at 30 km/h compared to 10 km/h, suggesting increased pedestrian discomfort at higher speeds. Furthermore, older participants tended to maintain higher side personal space. The findings of this study can be useful in designing and developing guidelines for sidewalks to accommodate e-scooters, including setting speed limits and designating specific spaces. © 2024 The Authors.

关键词： Pedestrian safety

来源：评论

学校读者我要写书评

暂无评论

Dielectric sensing of deeply subwavelength analytes using epsilon-near-zero waveguides 25

Dielectric sensing of deeply subwavelength analytes using ep...

引用

25th International Conference on Electromagnetics in Advanced Applications, ICEAA 2024

作者： Lezaun, Carlos Pacheco-Peña, Victor Beruete, Miguel Department of Electric Electronic and Communications Engineering Institute of Smart Cities Public University of Navarre Pamplona31006 Spain School of Mathematics Statistics and Physics Newcastle University Newcastle Upon TyneNE1 7RU United Kingdom

ISBN: (纸本)9798350360974

The advent of metamaterials brought new wave-matter interaction paradigms to manipulate field and waves at will. Their applications are numerous: antennas, lenses, invisibility cloaking, computing, vortex beams and more. In turn, epsilon-near-zero (ENZ) metamaterials opened up new phenomena for light manipulation due to their exotic propagation constant, wavenumber and characteristic impedance. In 2008, it was demonstrated that a rectangular waveguide can emulate ENZ media by working near the cutoff frequency [1]. Moreover, the incredible field confinement inside the ENZ waveguide provided interesting features for sensing applications [2]. Our work further develops the idea of a dielectric body sensor based on a ENZ waveguide by considering an analyte partially filling the waveguide [3] and demonstrating empirically the setup [4]. © 2024 IEEE.

关键词： Cutoff frequency

来源：评论

学校读者我要写书评

暂无评论

statistics in engineering degrees: a case study of a community service 52

Statistics in engineering degrees: a case study of a communi...

引用

52nd Annual Conference of the European Society for engineering: Educating Responsible Engineers, SEFI 2024

作者： Frutos-Bernal, E. Anciones-Polo, M. Rasteiro, D.M.L.D. Sánchez, M.J. Santos Queiruga-Dios, A. Encinas, A. Hernández Department of Statistics Universidad de Salamanca Salamanca Spain Polytechnic Institute of Coimbra Coimbra Institute of Engineering Coimbra Portugal Institute of Fundamental Physics and Mathematics Universidad de Salamanca Salamanca Spain Non-profit association AELCLÉS Salamanca Spain

ISBN: (纸本)9782873520274

mathematics is an important part of engineering studies;however, in recent years, the way of dealing with these subjects has changed and the type of students has changed as well. As it is well known, mathematics is a tool or a set of tools to develop the future work of engineers. This study presents a pedagogical approach that allows students to acquire mathematical competences while performing a service to the community. A case study of Service-Learning and the mathematical competences involved in a statistical project are analysed here. During the academic year 2023-2024, a group of students consisting of Industrial engineering, statistics and Labour Relations students collaborated with the ASCOL association (association against leukaemia and blood diseases) to carry out a statistical study of the data collected by the association. © 2024 SEFI 2024 - 52nd Annual Conference of the European Society for engineering, Proceedings: Educating Responsible Engineers. All rights reserved.

关键词： Students

来源：评论

学校读者我要写书评

暂无评论

Novel Analytical Thermal Performance Rate Analysis in ZnO-SAE50 Nanolubricant: Nonlinear Mathematical Model

引用

Computers, Materials & Continua 2021年第4期67卷 477-489页

作者： Adnan Abbasi Umar Khan Naveed Ahmed Syed Tauseef Mohyud-Din Ilyas Khan El-Sayed M.Sherif Department of Mathematics Mohi-ud-Din Islamic UniversityNerian SharifAJ&K12080Pakistan Department of Mathematics and Statistics Hazara UniversityMansehra21120Pakistan Department of Mathematics HITEC UniversityTaxilaCantt47070Pakistan University of Multan Multan66000Pakistan Department of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh City72915Vietnam Department of Mechanical Engineering College of EngineeringKing Saud UniversityAl-Riyadh11421Saudi Arabia Department of Physical Chemistry Electrochemistry and Corrosion LaboratoryNational Research CentreCairo12622Egypt

The investigation of local thermal transport rate in the nanolubricants is *** lubricants are broadly used in environmental pollution,mechanical engineering and in the paint industry due to high thermal performance ***,thermal transport in ZnO-SAE50 nanolubricant under the impacts of heat generation/absorption is *** colloidal suspension is flowing between parallel stretching disks in which the lower disk is positioned at z=0 and upper disk apart from distance *** problem is transformed in dimensionless version via described similarity *** the next stage,an analytical technique(VPM)is implemented for the solution *** graphical results against multiple flow parameters were furnished over the region of interest and explained *** is imperative to mention that the results are plotted for ZnO-SAE50 and conventional liquid as ***,rapid motion of the fluid is perceived against high Reynolds andγ*** wall shear stresses at the upper end rises for multiple Reynolds andγwhile;decrement is detected at the lower *** significant contribution of an internal heat source is noted for thermal performance rate at the upper ***,the local heat transport rate declines at the lower *** altering Reynolds number,prompt heat transfer rate is gained at the upper disk and increasing behavior of the local heat transport rate is slow at the lower *** the study,it is concluded that the nanolubricants have high thermal ***,such fluids are reliable to use in above stated areas.

关键词： Zno-SAE50 nanolubricant thermal performance local heat transport numerical algorithm skin friction

来源：评论

学校读者我要写书评

暂无评论

Statistical Hardware Design With Multi-model Active Learning

arXiv

引用

arXiv 2023年

作者： Ghaffari, Alireza Asgharian, Masoud Savaria, Yvon The Department of Electrical Engineering Polytechnique Montreal Canada The department of Mathematics and Statistics McGill Univesrity Canada

With the rising complexity of numerous novel applications that serve our modern society comes the strong need to design efficient computing platforms. Designing efficient hardware is, however, a complex multi-objective problem that deals with multiple parameters and their interactions. Given that there are a large number of parameters and objectives involved in hardware design, synthesizing all possible combinations is not a feasible method to find the optimal solution. One promising approach to tackle this problem is statistical modeling of a desired hardware performance. Here, we propose a model-based active learning approach to solve this problem. Our proposed method uses Bayesian models to characterize various aspects of hardware performance. We also use transfer learning and Gaussian regression bootstrapping techniques in conjunction with active learning to create more accurate models. Our proposed statistical modeling method provides hardware models that are sufficiently accurate to perform design space exploration as well as performance prediction simultaneously. We use our proposed method to perform design space exploration and performance prediction for various hardware setups, such as micro-architecture design and OpenCL kernels for FPGA targets. Our experiments show that the number of samples required to create performance models significantly reduces while maintaining the predictive power of our proposed statistical models. For instance, in our performance prediction setting, the proposed method needs 65% fewer samples to create the model, and in the design space exploration setting, our proposed method can find the best parameter settings by exploring less than 50 samples. © 2023, CC BY.

关键词： Learning systems

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：