检索结果-内蒙古大学图书馆

Proceedings of the 2025 CHI Conference on Human Factors in Computing Systems

作者： Jack West Bengisu Cagiltay Shirley Zhang Jingjie Li Kassem Fawaz Suman Banerjee Department of Computer Sciences University of Wisconsin-Madison Madison Wisconsin USA School of Informatics University of Edinburgh Edinburgh United Kingdom Electrical and Computer Engineering University of Wisconsin-Madison Madison Wisconsin USA

来源：评论

学校读者我要写书评

暂无评论

Design oligoporous-core based multimode fiber for mode division multiplexing applications

引用

Optical and Quantum Electronics 2025年第5期57卷 1-24页

作者： Mitu, Sumaiya Akhtar Abdulrazak, Lway Faisal Ibrahim, Sobhy M. Tahhan, Shaymaa R. Hossain, Md Bellal Ahmed, Kawsar Bui, Francis M. Chen, Li Department of Computer Science and Engineering University of Asia Pacific Dhaka Bangladesh Department of Information and Communication Technology Group of Bio-photomatiχ Mawlana Bhashani Science and Technology University Santosh Tangail Bangladesh Department of Computer Science Cihan University Sulaimaniya Sulaimaniya Kurdistan Region Iraq Department of Biochemistry College of Science King Saud University Riyadh Saudi Arabia Department of Laser and Optoelectronics Engineering College of Engineering Al-Nahrain University Jadriya Baghdad Iraq School of Electrical and Information Engineering The University of Sydney Sydney Australia Department of Electrical and Computer Engineering University of Saskatchewan Saskatoon Canada Health Informatics Research Lab Department of Computer Science and Engineering Daffodil International University Daffodil Smart City Birulia Dhaka Bangladesh

A polarization-maintaining oligoporous-core-based multi-mode fiber is proposed. By tuning the air hole, as well as the core number, shape, size, and position up to 28 distinct linearly polarized (LP) modes are obtained. The Finite Element Method (FEM) is used to perform the numerical investigations. In addition, various materials combinations are used as a doping with silica which is highly helpful to increase or decrease the refractive index of the core material. The multimode fiber is identified by the normalized frequency or V parameter. Besides, the high birefringence value, low loss value, minimum crosstalk with high sensitivity response of $$1.46\times {10}^{-2}$$ , $$2\times {10}^{-11}$$ dB/m, 41.80 dB and 88,280.46 nm/RIU, respectively, are achieved from the numerical investigations over the wavelength range from 1.55 µm to1.65 µm for the different LP modes. Moreover, good responses also obtain for the numerical aperture, V number, coupling length and other parameters. In the end, every value reveals both an easy-to-fabricate structure design as well as adequate performance analysis. The suggested fiber structure can support many modes and might be applicable in the field of optical communications and spatial multiplexing based on the user demand.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Evaluating Beam Sweeping for AoA Estimation with an RIS Prototype: Indoor/Outdoor Field Trials

Evaluating Beam Sweeping for AoA Estimation with an RIS Prot...

引用

IEEE Conference on Wireless Communications and Networking

作者： Dimitris Vordonis Dimitris Kompostiotis Vassilis Paliouras George C. Alexandropoulos Florin Grec Electrical and Computer Engineering Department University of Patras Greece Department of Informatics and Telecommunications National and Kapodistrian University of Athens Greece European Space Agency (ESA) Noordwijk Netherlands

ISBN: (数字)9798350368369

ISBN: (纸本)9798350368376

Reconfigurable Intelligent Surfaces (RISs) have emerged as a promising technology to enhance wireless communication systems by enabling dynamic control over the propagation environment. However, practical experiments are crucial towards the validation of the theoretical potential of RISs while establishing their real-world applicability, especially since most studies rely on simplified models and lack comprehensive field trials. In this paper, we present an efficient method for configuring a 1-bit RIS prototype at sub-6 GHz, resulting in a codebook oriented for beam sweeping; an essential protocol for initial access and Angle of Arrival (AoA) estimation. The measured radiation patterns of the RIS validate the theoretical model, demonstrating consistency between the experimental results and the predicted beamforming behavior. Furthermore, we experimentally prove that RIS can alter channel properties and by harnessing the diversity it provides, we evaluate beam sweeping as an AoA estimation technique. Finally, we investigate the frequency selectivity of the RIS and propose an approach to address indoor challenges by leveraging the geometry of environment.

关键词： Geometry Wireless communication Protocols Prototypes Reconfigurable intelligent surfaces Size measurement Real-time systems Gain Wideband Antenna radiation patterns

来源：评论

学校读者我要写书评

暂无评论

Near-Field Localization with Dynamic Metasurface Antennas at THz: A CRB Minimizing Approach

arXiv

引用

arXiv 2025年

作者： Gavras, Ioannis Alexandropoulos, George C. Department of Informatics and Telecommunications National and Kapodistrian University of Athens Athens16122 Greece Department of Electrical and Computer Engineering University of Illinois ChicagoIL60601 United States

The recent trend for extremely massive antenna arrays and high frequencies facilitates localization and sensing, offering increased angular and range resolution. In this letter, we focus on the emerging technology of Dynamic Metasurface Antennas (DMAs) and present a novel framework for the design of their analog beamforming weights, targeting high accuracy near-field localization at the THz frequency band. We derive the Cramér-Rao Bound (CRB) for the estimation of the positions of multiple users with a DMA-based receiver, which is then utilized as the optimization objective for the receiver’s discrete tunable states of its metamaterials. Leveraging the DMA structure, we reformulate the localization objective into a constrained Rayleigh quotient maximization problem, which is efficiently solved via two schemes: one based on projection and a greedy one. Our simulation results verify the validity of our near-field localization analysis, showcasing the effectiveness of the proposed near-field localization designs over the optimum exhaustive search solution and state-of-the-art schemes. © 2025, CC BY-NC-ND.

关键词： Cramer-Rao bounds

来源：评论

学校读者我要写书评

暂无评论

A novel real-time noise-resilient zeroing neural network and its applications to matrix problem solving

引用

Mathematics and computers in Simulation 2025年

作者： Yang, Yiguo Wu, Pin Katsikis, Vasilios N. Li, Shuai Feng, Weibing The School of Computer Engineering and Science Shanghai University Shanghai200444 China The Department of Economics Division of Mathematics-Informatics and Statistics-Econometrics National and Kapodistrian University of Athens Athens10559 Greece The Faculty of Information Technology and Electrical Engineering University of Oulu Oulu90570 Finland

Given the critical role of zeroing neural networks (ZNN) in various fields and the practical demand for models in effectively resisting real-time noise, this study introduces a novel anti-noise integral zeroing neural network (AN-IZNN) model alongside its enhanced counterpart (EAN-IZNN), for the applications of matrix problem solving. Theoretical analysis demonstrates their ability to achieve convergence even under different noise conditions. Both theoretical analyses and simulation validations highlight the superior performance of the proposed models over existing neural network models. Notably, the root mean square error of the proposed AN-IZNN and EAN-IZNN models is reduced by 92.6249% and 91.4178%, respectively, compared to scenarios without the proposed method, demonstrating the effectiveness of the solution. © 2025

关键词： Neural network models

来源：评论

学校读者我要写书评

暂无评论

Optimizing reinforcement learning for large action spaces via generative models: Battery pattern selection

引用

Pattern Recognition 2025年 160卷

作者： Hu, Jingwei Li, Xinjie Li, Xiaodong Hou, Zhensong Zhang, Zhihong School of Informatics Xiamen University Xiamen China School of Electrical and electronic engineering North China Electric Power University Beijing China Department of Computer Science The University of Hong Kong Hong Kong China

Intrinsic and environmental factors contribute to variability in the performance of cells within a battery pack, affecting the lifespan and safety of battery systems. To solve this problem, active and passive equalization methods are proposed. However, existing passive equalization methods suffer from energy loss and low efficiency among batteries, while existing active equalization methods necessitate complex expert knowledge and control algorithms. We propose an active equalization model that leverages a generative model (GM) to assist in pattern selection for a reinforcement learning (RL) scheme, tailored for Dynamic Reconfigurable Battery (DRB) systems. The proposed model overcomes the pattern selection challenge in large-scale discrete action spaces by employing a Variational Autoencoder (VAE) for dimensionality reduction and latent space mapping, actively balancing DRB systems. Moreover, the use of pattern subgraphs diminishes dependence on expert knowledge, enabling the model to recognize structural information and adjust the system's stability. The experimental setup adheres to the laws of physics and tests the model's functionality on a simulation system. Results show that the proposed Generative Model-based Reinforcement Learning (GMRL) approach effectively addresses decision-making challenges in large-scale spaces. It can learn the structured features of the battery network, thus balancing the energy storage system and maximizing discharge efficiency gains. © 2024

关键词： Generative adversarial networks

来源：评论

学校读者我要写书评

暂无评论

Z-UPSCALING: Optical Flow Guided Frame Interpolation for Isotropic Reconstruction of 3D EM Volumes

Z-UPSCALING: Optical Flow Guided Frame Interpolation for Iso...

引用

IEEE International Symposium on Biomedical Imaging

作者： Fisseha A. Ferede Ali Khalighifar Jaison John Krishnan Venkataraman Khaled Khairy Center for Bioimage Informatics St. Jude Children's Research Hospital Memphis TN USA Department of Electrical and Computer Engineering University of Memphis Memphis TN USA

ISBN: (数字)9798331520526

ISBN: (纸本)9798331520533

We propose a novel optical flow based approach to enhance the axial resolution of anisotropic 3D EM volumes to achieve isotropic 3D reconstruction. Assuming spatial continuity of 3D biological structures in well aligned EM volumes, we reasoned that optical flow estimation techniques, often applied for temporal resolution enhancement in videos, can be utilized. Pixel-level motion is estimated between neighboring 2D slices along z, using spatial gradient flow estimates to interpolate and generate new 2D slices resulting in isotropic voxels. We leverage recent state-of-the-art learning methods for video frame interpolation and transfer learning techniques, and demonstrate the success of our approach on publicly available ultrastructure EM volumes.

关键词： Training Learning systems Interpolation Three-dimensional displays Transfer learning Superresolution Spatial resolution Optical flow Image reconstruction Videos

来源：评论

学校读者我要写书评

暂无评论

Performance Analysis of ISAC With Active Multi-functional RISs in Rician Fading Channels

引用

IEEE Transactions on Cognitive Communications and Networking 2025年

作者： Parihar, Abhinav Singh Singh, Keshav Alexandropoulos, George C. Ding, Zhiguo Li, Chih-Peng National Sun Yat-sen University Institute of Communications Engineering Kaohsiung80424 Taiwan National and Kapodistrian University of Athens Department of Informatics and Telecommunications Panepistimiopolis Ilissia Athens15784 Greece University of Illinois Chicago Department of Electrical and Computer Engineering IL60601 United States The University of Manchester School of Electrical and Electronic Engineering ManchesterM13 9PL United Kingdom

In this work, we study the performance of an integrated sensing and communications (ISAC) system utilizing both a simultaneous transmitting and receiving (STAR) reconfigurable intelligent surface (RIS) and a solely reflective RIS under Rician fading channels. The base station is assumed to have multiple antennas, and with the assistance of active tunable reflections and refractions from the STAR-RIS, performs non-orthogonal multiple access (NOMA) data communications to multiple users, while the conventional RIS contributes to the detection of targets lying in its vicinity via its amplified reflections. We present novel analytical expressions for performance metrics of the considered system, including the outage probability, ergodic rate, system throughput, and sensing rate, as well as conduct an asymptotic analysis to emphasize the balance between sensing and communication capabilities. Our numerical analytical results demonstrate that the considered active RISs can simultaneously enhance both signal strength and sensing performance, which is particularly pronounced in low to medium signal-to-noise ratio conditions, outperforming passive RIS configurations. We have also performed comparisons between the considered NOMA scheme and an orthogonal one, unveiling the superiority of the former in terms of the above-mentioned performance metrics. The effects of system parameters, such as the transmission power, Rician factor, and channel estimation errors, on the overall network performance were investigated through extensive Monte Carlo simulations, validating our analytical findings. © 2015 IEEE.

关键词： Channel estimation

来源：评论

学校读者我要写书评

暂无评论

Seamless Graph Task Scheduling over Dynamic Vehicular Clouds: A Hybrid Methodology for Integrating Pilot and Instantaneous Decisions

引用

IEEE Transactions on Services Computing 2025年

作者： Guo, Bingshuo Liwang, Minghui Xia, Xiaoyu Li, Li Jiao, Zhenzhen Hosseinalipour, Seyyedali Wang, Xianbin Xiamen University School of Informatics Fujian China Rmit University School of Computing Technologies MelbourneVIC Australia Tongji University Department of Control Science and Engineering Shanghai China Beijing Teleinfo Technology Co. Ltd. Caict IF-Labs China University at Buffalo-SUNY Department of Electrical Engineering NY United States Western University Department of Electrical and Computer Engineering ON Canada

Vehicular clouds (VCs) play a crucial role in the Internet-of-Vehicles (IoV) ecosystem by securing essential computing resources for a wide range of tasks. This paPertackles the intricacies of resource provisioning in dynamic VCs for computation-intensive tasks, represented by undirected graphs for parallel processing over multiple vehicles. We model the dynamics of VCs by considering multiple factors, including varying communication quality among vehicles, fluctuating computing capabilities of vehicles, uncertain contact duration among vehicles, and dynamic data exchange costs between vehicles. Our primary goal is to obtain feasible assignments between task components and nearby vehicles, called templates, in a timely manner with minimized task completion time and data exchange overhead. To achieve this, we propose a hybrid graph task scheduling (P-HTS) methodology that combines offline and online decision-making modes. For the offline mode, we introduce an approach called risk-aware pilot isomorphic subgraph searching (RA-PilotISS), which predicts feasible solutions for task scheduling in advance based on historical information. Then, for the online mode, we propose time-efficient instantaneous isomorphic subgraph searching (TE-InstaISS), serving as a backup approach for quickly identifying new optimal scheduling template when the one identified by RA-PilotISS becomes invalid due to changing conditions. Through comprehensive experiments, we demonstrate the superiority of our proposed hybrid mechanism compared to state-of-the-art methods in terms of various evaluative metrics, e.g., time efficiency such as the delay caused by seeking for possible templates and task completion time, as well as cost function, upon considering different VC scales and graph task topologies. © 2025 IEEE.

关键词： Undirected graphs

来源：评论

学校读者我要写书评

暂无评论

Self-Supervised Hyperbolic Spectro-Temporal Graph Convolution Network for Early 3D Behavior Prediction

引用

IEEE Transactions on Cognitive and Developmental Systems 2025年

作者： Liu, Peng Lai, Qin Li, Haibo Zhao, Chong Wang, Qicong Meng, Hongying Xiamen University Department of Computer Science and Technology School of Informatics Xiamen361102 China Brunel University London Department of Electronic and Electrical Engineering UxbridgeUB8 3PH United Kingdom

3D human behavior is a highly nonlinear spatiotemporal interaction process. Therefore, early behavior prediction is a challenging task, especially prediction with low observation rates in unsupervised mode. To this end, we propose a novel self-supervised early 3D behavior prediction frame-work that learns graph structures on hyperbolic manifold. Firstly, we employ the sequence construction of multi-dynamic key information to enlarge the key details of spatio-temporal behavior sequences, addressing the high redundancy between frames of spatio-temporal interaction. Secondly, for capturing dependencies among long-distance joints, we explore a unique graph Laplacian on hyperbolic manifold to perceive the subtle local difference within frames. Finally, we leverage the learned spatio-temporal features under different observation rates for progressive contrast, forming self-supervised signals. This facilitates the extraction of more discriminative global and local spatio-temporal information from early behavior sequences in unsupervised mode. Extensive experiments on three behavior datasets have demonstrated the superiority of our approach at low to medium observation rates. © 2016 IEEE.

关键词： Self-supervised learning

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：