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Reconfigurable Holographic Surface: A New Paradigm for Ultra-Massive MIMO

IEEE Transactions on Cognitive Communications and Networking 2025年

作者： Di, Boya Zhang, Hongliang Han, Zhu Zhang, Rui Song, Lingyang Peking University School of Electronics China University of Houston Department of Electrical and Computer Engineering HoustonTX United States Kyung Hee University Department of Computer Science and Engineering Seoul Korea Republic of The Chinese University of Hon g Kong School of Science and Engineering Guangdong Shenzhen China National University of Singapore Department of Electrical and Computer Engineering Singapore Singapore Peking University Shenzhen Graduate School School of Electronic and Computer Engineering China

Evolving from massive multiple-input multiple-output (MIMO) in current 5G communications, ultra-massive MIMO emerges as a seminal technology for fulfilling more stringent requirements of future 6G communications. However, widely-utilized phased arrays relying on active components make the implementation of ultra-massive MIMO in practice increasingly prohibitive from both cost and power consumption perspectives. In contrast, the development of reconfigurable holographic surface (RHS) provides a new paradigm to solve the above issue without the need of costly hardware components. By leveraging the holographic principle, the RHS serves as an ultra-thin and lightweight surface antenna integrated with the transceiver, which is a promising alternative to phased arrays for realizing ultra-massive MIMO. In this paper, we provide a comprehensive overview of the RHS, especially the RHS-aided communication and sensing. We first describe the basic concepts of RHS, and introduce its working principle and unique practical constraints. Moreover, we show how to utilize the RHS to achieve cost-efficient and high-performance wireless communication and sensing, and introduce the key technologies. In particular, we present the implementation of RHS with a wireless communication prototype, and report the experimental measurement results based on it. Finally, we outline some open challenges and potential future directions in this area. © 2015 IEEE.

关键词： Antenna phased arrays

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The Influence of Overcharging and Over-Discharging on the Capacity Degradation of Lithium-Ion Batteries

The Influence of Overcharging and Over-Discharging on the Ca...

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IEEE Conference on Vehicle Power and Propulsion (VPPC)

作者： Joelton Deonei Gotz Marco Antonio Simões Teixeira Fernanda Cristina Corrêa Emilson Ribeiro Viana Alceu André Badin Milton Borsato Graduate Program in Electrical and Computer Engineering Federal Technological University of Paraná (UTFPR-CT) Curitiba Brazil Graduate Program in Informatics (PPGIa) Pontifical Catholic University of Paraná (PUC-PR) Curitiba Brazil Graduate Program in Electrical Engineering Federal Technological University of Paraná (UTFPR-PG) Ponta Grossa Brazil Physics Department Graduate Program in Physics and Astronomy Federal Technological University of Paraná (UTFPR-CT) Curitiba Brazil Graduate Program in Mechanical Engineering Federal Technological University of Paraná (UTFPR-CT) Curitiba Brazil

ISBN: (数字)9798331541606

ISBN: (纸本)9798331541613

Lithium-ion batteries (LIB) are the best technology for supplying and storing energy for electric mobility systems. Despite that, this technology is sensitive to abuses that can compromise its lifetime and cause fire and explosion risks. In this context, if LIB is not correctly controlled, some abuses, such as overcharging (OC) and over-discharging (OD), can be observed and provoke a loss of capacity. Therefore, this work presented the application of several experiments in cells, of the NMC type, under OC and the combination of OC and OD. The results indicated that cells charged until 4.4 and 4.5 V and discharged until 3.0 V do not lose capacity for twenty-five cycles, but more cycles should be done to understand the impact over time. On the other side, the cell charged until 4.6 and 4.8 V had its security protection romped in the fourth charging cycle, and the cell charged until 5.0 V had its safety compromised in the first charging cycle. Conversely, cells with a combination of OC and OD were more compromised. In this context, while a cell is submitted only with OC and does not lose capacity, a cell under OC and then under OD had its protection romped in the third charging cycle. Cells under 4.6 V and 4.8 V lost capacity during the second charging cycle. In conclusion, OC provokes a high level of degradation in the cell, but the combination of OC and OD causes even more degradation.

关键词： Degradation Lithium-ion batteries Battery management systems Propulsion Security Reliability Protection Stress Monitoring Predictive maintenance

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Contract-Inspired Contest Theory for Controllable Image Generation in Mobile Edge Metaverse

arXiv

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arXiv 2025年

作者： Liu, Guangyuan Du, Hongyang Wang, Jiacheng Niyato, Dusit Kim, Dong In College of Computing and Data Science The Energy Research Institute @ NTU Interdisciplinary Graduate Program Nanyang Technological University Singapore Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong College of Computing and Data Science Nanyang Technological University Singapore Department of Electrical and Computer Engineering Sungkyunkwan University Korea Republic of

The rapid advancement of immersive technologies has propelled the development of the Metaverse, where the convergence of virtual and physical realities necessitates the generation of high-quality, photorealistic images to enhance user experience. However, generating these images, especially through Generative Diffusion Models (GDMs), in mobile edge computing environments presents significant challenges due to the limited computing resources of edge devices and the dynamic nature of wireless networks. This paper proposes a novel framework that integrates contract-inspired contest theory, Deep Reinforcement Learning (DRL), and GDMs to optimize image generation in these resource-constrained environments. The framework addresses the critical challenges of resource allocation and semantic data transmission quality by incentivizing edge devices to efficiently transmit high-quality semantic data, which is essential for creating realistic and immersive images. The use of contest and contract theory ensures that edge devices are motivated to allocate resources effectively, while DRL dynamically adjusts to network conditions, optimizing the overall image generation process. Experimental results demonstrate that the proposed approach not only improves the quality of generated images but also achieves superior convergence speed and stability compared to traditional methods. This makes the framework particularly effective for optimizing complex resource allocation tasks in mobile edge Metaverse applications, offering enhanced performance and efficiency in creating immersive virtual environments. © 2025, CC BY.

关键词： Mobile edge computing

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Control Strategies for Multifunctional Active Front-End Converter in Oil and Gas Platforms 16

Control Strategies for Multifunctional Active Front-End Conv...

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16th Brazilian Power electronics Conference, COBEP 2021

作者： Da Rocha, Lorrana F. Vitoi, Lais A. Tedeschi, Elisabetta Brandao, Danilo I. Graduate Program in Electrical Engineering Belo Horizonte Brazil Department of Electric Power Engineering Trondheim Norway Department of Industrial Engineering University of Trento Trento Italy

ISBN: (纸本)9781665421294

This paper compares control strategies for active power exchange and electrical disturbance compensation for multifunction active front-end converters applied to offshore oil and gas platforms. Such scenarios are characterized as weak grids due to their isolated nature and the presence of heavy motor loads. Thereby, harmonic compensation may play an important role in increasing power quality indexes. Thus, different strategies (i.e., sinusoidal current and resistive load synthesis) are com-pared, varying between injection, absorption and compensation targets. Such functionalities are fully performed by active front-end converters embedded in energy storage system since the bidirectional power exchange is possible;or partially performed by wind-based system, variable frequency drive and active power filter. The strategies are analyzed in terms of damping capacity through the frequency response, voltage distortion caused at the point of the converter connection, total demand distortion for the source current, and power factor at the terminals of the generators. © 2021 IEEE.

关键词： Frequency response

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MARVEL:Multi-Agent Reinforcement Learning for VANET Delay Minimization

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China Communications 2021年第6期18卷 1-11页

作者： Chengyue Lu Zihan Wang Wenbo Ding Gang Li Sicong Liu Ling Cheng Tsinghua-Berkeley Shenzhen Institute Tsinghua Shenzhen International Graduate SchoolTsinghua University518055China Department of Electronic Engineering Tsinghua University100084China Department of Information and Communication Engineering Xiamen University361005China School of Electrical and Information Engineering University of the WitwatersrandJohannesburg2000South Africa

In urban Vehicular Ad hoc Networks(VANETs),high mobility of vehicular environment and frequently changed network topology call for a low delay end-to-end routing *** this paper,we propose a Multi-Agent Reinforcement Learning(MARL)based decentralized routing scheme,where the inherent similarity between the routing problem in VANET and the MARL problem is *** proposed routing scheme models the interaction between vehicles and the environment as a multi-agent problem in which each vehicle autonomously establishes the communication channel with a neighbor device regardless of the global *** performed in the 3GPP Manhattan mobility model demonstrates that our proposed decentralized routing algorithm achieves less than 45.8 ms average latency and high stability of 0.05%averaging failure rate with varying vehicle capacities.

关键词： VANET multi-agent RL delay minimization routing algorithm

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Mini-InternVL: a flexible-transfer pocket multi-modal model with 5% parameters and 90% performance

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Visual Intelligence 2024年第1期2卷 1-17页

作者： Gao, Zhangwei Chen, Zhe Cui, Erfei Ren, Yiming Wang, Weiyun Zhu, Jinguo Tian, Hao Ye, Shenglong He, Junjun Zhu, Xizhou Lu, Lewei Lu, Tong Qiao, Yu Dai, Jifeng Wang, Wenhai Shanghai AI Laboratory Shanghai 200232 China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Computer Science Nanjing University Nanjing 210023 China Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China School of Computer Science Fudan University Shanghai 200433 China SenseTime Research Shanghai 200233 China Department of Electronic Engineering Tsinghua University Beijing 100084 China Beijing National Research Center for Information Science and Technology Department of Automation Tsinghua University Beijing 100084 China Department of Information Engineering The Chinese University of Hong Kong 999077 Hong Kong

Multi-modal large language models (MLLMs) have demonstrated impressive performance in vision-language tasks across a wide range of domains. However, the large model scale and associated high computational cost pose significant challenges for training and deploying MLLMs on consumer-grade GPUs or edge devices, thereby hindering their widespread application. In this work, we introduce Mini-InternVL, a series of MLLMs with parameters ranging from 1 billion to 4 billion, which achieves 90% of the performance with only 5% of the parameters. This significant improvement in efficiency and effectiveness makes our models more accessible and applicable in various real-world scenarios. To further promote the adoption of our models, we are developing a unified adaptation framework for Mini-InternVL, which enables our models to transfer and outperform specialized models in downstream tasks, including autonomous driving, medical image processing, and remote sensing. We believe that our models can provide valuable insights and resources to advance the development of efficient and effective MLLMs. © The Author(s) 2024.

关键词： Knowledge distillation Lightweight multi-modal large language model Vision-language model Visual instruction tuning

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Fast-Phase-Switching Vector Sum Phase Shifter Using Digital Quadrature Splitter

Fast-Phase-Switching Vector Sum Phase Shifter Using Digital ...

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Asia-Pacific Conference on Microwave

作者： Asaka Kobayashi Ren Imanishi Hideyuki Nosaka Department of Electrical and Electronic Engineering Ritsumeikan University Kusatsu Shiga Japan Graduate School of Science and Engineering Ritsumeikan University Kusatsu Shiga Japan

This paper presents fast-phase-switching vector sum phase shifter using digital quadrature splitter. The digital quadrature splitter makes folding circuits produce pseudo sine and pseudo cosine functions in a pseudo-sine-cosine generator to provide high-speed phase switching and linear phase control characteristics with low power consumption. A prototype exhibits 360° linear phase shift characteristics at 5 GHz without digital pre-calculation or calibration. The measured phase switching time is 100 ns.

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Shoe-type device to estimate body balance focusing on the relationship between CoM and BoS estimated from CoP

Shoe-type device to estimate body balance focusing on the re...

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SICE International Symposium on Control Systems (ISCS)

作者： Yuta Ishii Kazuki Date Taku Itami Jun Yoneyama Graduate School of Science and Engineering Aoyama Gakuin University Kanagawa Japan Department of Electrical and Electronic Engineering Aoyama Gakuin University Kanagawa Japan

In modern society, body falling of elderly people is a problem that needs to be solved. In particular, old elderly people often fall indoors during activities of daily life. This study focuses on the relationship between the base of support(BoS) and center of mass(CoM), and aims to develop a shoe-type device that can estimate the body balance of elderly people. In this study, we propose an algorithm that can estimate the position of the BoS and CoM using a pressure sensor attached to the sole of a shoe and an ultrasonic sensor. The effectiveness of the proposed method is shown by comparing the estimated position of the CoM in the shoe-type device with the position of the CoM in a 3D motion analyzer. The results confirmed the feasibility of the proposed method for estimating the position of the CoM in front-back posture change during standing.

关键词： Pressure sensors Three-dimensional displays Estimation Focusing Footwear Control systems Acoustics

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CsPbBr3 perovskite quantum-dot paper exhibiting highest 3-dB bandwidth and realizing flexible white-light system for visible-light communication

CsPbBr3 perovskite quantum-dot paper exhibiting highest 3-dB...

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International Conference on Display Technology, ICDT 2022

作者： Lu, Tingwei Singh, Konthoujam James Huang, Yu-Ming Pan, Jianhua Chen, Zhong Wu, Tingzhu Kuo, Hao-Chung Department of Photonics and Graduate Institute of Electro-Optical Engineering College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan School of Electronic Science and Engineering Fujian Engineering Research Center for Solid-State Lighting Xiamen University Xiamen361005 China

We propose a flexible white-light system for high-speed visible-light communication (VLC) applications, consisting of a semipolar blue InGaN/GaN single-quantum-well micro-light-emitting diode (LED) on a flexible substrate pumping green CsPbBr3 perovskite quantum-dot (PQD) paper in nanostructure form and red CdSe QD paper. The highest bandwidth for CsPbBr3 PQD paper, 229 MHz, is achieved with a blue micro-LED pumping source, this is very promising for VLC application. © 2022, John Wiley and Sons Inc. All rights reserved.

关键词： Perovskite

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A Study on Damage Evaluation Method for Box Section Steel Columns Using Autoencoder 33rd

A Study on Damage Evaluation Method for Box Section Steel Co...

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33rd International Ocean and Polar engineering Conference, ISOPE 2023

作者： Fujisaku, Yusuke Naito, Hideki Kimoto, Tomoyuki Matsumura, Masahide Takeshima, Natsumi Okada, Seiji Ono, Kiyoshi Department of Civil and Environmental Engineering Graduate School of Engineering Tohoku University Miyagi Sendai Japan Department of Electrical and Electronic Engineering National Institute of Technology Oita College Oita Oita Japan Center for Water Cycle Marine Environment and Disaster Management Kumamoto University Kumamoto Kumamoto Japan LCB∙DX Division Re search and Development Department IHI Infrastructure Systems Co. Ltd Minato Tokyo Japan Department of Civil and Environmental Engineering Waseda University Shinjuku Tokyo Japan

ISBN: (纸本)9781880653807

A convolutional autoencoder (CAE)-based damage evaluation method that uses frequency response functions as features was studied. A compression test was conducted on a box-section steel column to introduce out-of-plane deformation, and vibration was excited in the loading steps. From measured vibrational characteristics, the CAE model was trained, and anomaly scores were obtained. The anomaly scores obtained from the area where local buckling has occurred increased with the progression of the loading test. It was concluded that the proposed method is useful to conduct damage evaluation and structural health monitoring on steel columns. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Convolution

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