检索结果-内蒙古大学图书馆

Minimizing Age of Information in UAV-Assisted Edge Computing System with Multiple Transmission Modes

清华大学学报自然科学版（英文版） 2025年第3期30卷 1060-1078页

作者： Yanhua Pei Yunzhi Zhao Fen Hou State Key Laboratory of IoT for Smart City and Department of Electrical and Computer Engineering University of MacauMacau 999078China

With the advance of 5G technologies and the development of space-air-ground-sea applications,the fast and efficient collection and processing of the explosive growth of sensing data have become significant and *** this paper,considering the Age of Information(AoI),the limited coverage of Base Stations(BS),and the constrained computation capability of Unmanned Aerial Vehicle(UAV),we propose a hybrid communication framework that utilizes UAVs as relays to optimize the collection of sensing *** aim to minimize the average AoI of the data among all sensor nodes while considering the energy consumption constraints of sensor nodes,which is formulated as a Mixed Integer NonLinear Programming(MINLP).To address this problem,we decompose it into communication resource allocation and computation resource ***,the average AoI of the whole system is minimized and the average energy consumption constraint of sensor nodes is *** simulation results show that our proposed method can achieve significant performance *** specific,our proposed method can reduce the average AoI by 20％,11％,and 43％compared to the three counterparts,Data Transmission Directly Algorithm(DTDA),Max Weight Algorithm(MWA),and matching algorithm,respectively.

关键词： edge computing hybrid relay Unmanned Aerial Vehicle(UAV)assisted Age of Information(AoI)

来源：评论

学校读者我要写书评

暂无评论

Distributionally Robust Chance-Constrained Optimization for Soft Open Points Operation in Active Distribution Networks

引用

CSEE Journal of Power and Energy Systems 2025年第2期11卷 637-648页

作者： Qilin Hou Ge Chen Ningyi Dai Hongcai Zhang Department of Electrical and Computer Engineering State Key Laboratory of Internet of Things for Smart CityUniversity of MacaoMacao 999078China

The escalating installation of distributed generation (DG) within active distribution networks (ADNs) diminishes the reliance on fossil fuels, yet it intensifies the disparity between demand and generation across various regions. Moreover, due to the intermittent and stochastic characteristics, DG also introduces uncertain forecasting errors, which further increase difficulties for power dispatch. To overcome these challenges, an emerging flexible interconnection device, soft open point (SOP), is introduced. A distributionally robust chance-constrained optimization (DRCCO) model is also proposed to effectively exploit the benefits of SOPs in ADNs under uncertainties. Compared with conventional robust, stochastic and chance-constrained models, the DRCCO model can better balance reliability and economic profits without the exact distribution of uncertainties. More-over, unlike most published works that employ two individual chance constraints to approximate the upper and lower bound constraints (e.g, bus voltage and branch current limitations), joint two-sided chance constraints are introduced and exactly reformulated into conic forms to avoid redundant conservativeness. Based on numerical experiments, we validate that SOPs' employment can significantly enhance the energy efficiency of ADNs by alleviating DG curtailment and load shedding problems. Simulation results also confirm that the proposed joint two-sided DRCCO method can achieve good balance between economic efficiency and reliability while reducing the conservativeness of conventional DRCCO methods.

关键词： Active distribution networks distributionally robust chance-constrained optimization soft open points

来源：评论

学校读者我要写书评

暂无评论

Real-Time Coordinated Operation of Electric Vehicle Fast Charging Stations With Energy Storage: An Efficient Spatiotemporal Decomposition Approach

引用

IEEE Transactions on smart Grid 2025年第3期16卷 2464-2477页

作者： Zhu, Zhen Zhang, Hongcai University of Macau State Key Laboratory of Internet of Things for Smart City Department of Electrical and Computer Engineering China

Fast charging stations (FCSs) have been widely adopted to meet the increasing charging demands of electric vehicles. The intermittent and impulsive nature of fast charging might significantly deteriorate the safe and efficient operation of the distribution power grid. Integrating battery energy storage systems (BES) in FCSs presents a promising option to mitigate these challenges. However, it is nontrivial to effectively coordinate multiple BES-equipped FCSs due to the highly stochastic charging demand and the spatio-temporal coupling nature of FCS operation. To address these challenges, this paper proposes a two-layer approach for real-time stochastic scheduling of multiple BES-equipped FCSs in a distribution grid. In the upper layer, we propose a computationally efficient dynamic programming method to determine the total power of all BESs at FCSs based on observed real-time fast charging loads and electricity price. Specifically, we derive analytical expressions for efficient offline training and online scheduling of the dynamic programming problem. This approach allows for direct training of value functions without iterative updating and obtaining scheduling decisions without redundant calculations. In the lower layer, we design a consensus-based power allocation strategy to coordinate power dispatch among individual FCSs following the reference power determined in the upper layer. In this way, real-time responses for each BES-equipped FCS can be given sequentially and distributedly. The superiority of the proposed method is validated via numerical simulations in comparison with state-of-the-art benchmarks. © 2010-2012 IEEE.

关键词： Charging stations

来源：评论

学校读者我要写书评

暂无评论

Dynamic Performance of Non-Minimum-Phase Zeros-Dominated Power-Synchronization Control

引用

IEEE Transactions on Power Systems 2025年第2期40卷 1985-1988页

作者： Jin, Xin Dai, Ningyi State Key Laboratory of Internet of Things for Smart City Department of Electrical and Computer Engineering University of Macau 999078 China

In this letter, it is found that non-minimum-phase zeros of power-synchronization control (PSC), induced by q-axis current injection, only dominate the system in weak grids, with one exception of low converter voltage magnitude. Using Bode's gain/phase relation, a trade-off analytical condition between the bandwidth and phase margin is proposed considering the locations of right-half-plant (RHP) zeros. System dynamic performance is improved compared to the design ignoring the effect of RHP zeros. © 1969-2012 IEEE.

关键词： Bandwidth Transfer functions Power system stability Impedance System dynamics Stability criteria Reactive power Power system dynamics Grid forming Tuning

来源：评论

学校读者我要写书评

暂无评论

Achievable Rate Analysis and Optimization of Double-RIS Assisted Spatially Correlated MIMO with Statistical CSI

引用

China Communications 2025年第1期22卷 139-157页

作者： Xu Kaizhe Guo Jiajia Zhang Jun Jin Shi Ma Shaodan Department of Communications and Networking Xi’an Jiaotong-Liverpool UniversitySuzhou 215123China State Key Laboratory of Internet of Things for Smart City University of MacaoMacao SARChina Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China State Key Laboratory of Internet of Things for Smart City and the Department of Electrical and Computer Engineering University of MacaoMacao SARChina

Reconfigurable intelligent surface(RIS)is a novel meta-material which can form a smart radio environment by dynamically altering reflection directions of the impinging electromagnetic *** the prior literature,the inter-RIS links which also contribute to the performance of the whole system are usually neglected when multiple RISs are *** this paper we investigate a general double-RIS assisted multiple-input multiple-output(MIMO)wireless communication system under spatially correlated non line-of-sight propagation channels,where the cooperation of the double RISs is also *** design objective is to maximize the achievable ergodic rate based on full statistical channel state information(CSI).Specifically,we firstly present a closedform asymptotic expression for the achievable ergodic rate by utilizing replica method from statistical *** a full statistical CSI-enabled optimal design is proposed which avoids high pilot training overhead compared to instantaneous CSI-enabled *** further reduce the signal processing overhead and lower the complexity for practical realization,a common-phase scheme is proposed to design the double *** results show that the derived asymptotic ergodic rate is quite accurate even for small-sized antenna *** the proposed optimization algorithm can achieve substantial gain at the expense of a low overhead and ***,the cooperative double-RIS assisted MIMO framework is proven to achieve superior ergodic rate performance and high communication reliability under harsh propagation environment.

关键词： common reflection pattern double RISs large system analysis MIMO replica method

来源：评论

学校读者我要写书评

暂无评论

Optical Integrated Sensing and Communication With Light-Emitting Diode

引用

IEEE Internet of Things Journal 2025年第9期12卷 12896-12911页

作者： Zhang, Runxin Shao, Yulin Li, Menghan Lu, Lu Eldar, Yonina C. Chinese Academy of Sciences Key Laboratory of Space Utilization Technology and Engineering Center for Space Utilization Beijing100094 China University of Chinese Academy of Sciences School of Aeronautics and Astronautics Beijing100049 China University of Macau State Key Laboratory of Internet of Things for Smart City Department of Electrical and Computer Engineering China Weizmann Institute of Science Faculty of Mathematics and Computer Science Rehovot7610001 Israel

This article presents a new optical integrated sensing and communication (O-ISAC) framework tailored for cost-effective light-emitting diode (LED) for enhanced Internet of Things (iot) applications. Unlike prior research on ISAC, which predominantly focused on radio frequency (RF) band, O-ISAC capitalizes on the inherent advantages of the optical spectrum, including the ultrawide license-free bandwidth, immunity to RF interference, and energy efficiency—attributes crucial for iot communications. The communication and sensing in our O-ISAC system unfold in two phases: 1) directionless O-ISAC and 2) directional O-ISAC. In the first phase, distributed optical access points emit nondirectional light for communication and leverage small-aperture imaging principles for sensing. In the second phase, we put forth the concept of optical beamforming, using collimating lenses to concentrate light, resulting in substantial performance enhancements in both communication and sensing. Numerical and simulation results demonstrate the feasibility and impressive performance of O-ISAC benchmarked against optical separate communication and sensing systems. © 2014 IEEE.

关键词： Beamforming

来源：评论

学校读者我要写书评

暂无评论

Enhancing the Self-Healing Capability of Cyber-Physical Distribution Systems: A UAV-5G Hybrid Wired/Wireless Communication Method

引用

IEEE Transactions on smart Grid 2025年

作者： Huang, Zhanghao Lao, Keng-Weng Yang, Shaohua Feng, Guangxu Gong, Jianhua Lin, Nan Nie, Yu Zhan, Jianyong University of Macau State Key Laboratory of Internet of Things for Smart City Department of Electrical and Computer Engineering 999078 China

Unmanned aerial vehicle (UAV)-assisted wireless communication is emerging as a pivotal technique to facilitate the self-healing of cyber-physical distribution systems (CPDSs) after disasters. However, owing to the limited resources of UAVs, wireless communication is unable to cover all the disconnected distribution terminals, which impedes the automatic load pick-up. To tackle this problem, this letter proposes a novel UAV-5G hybrid wired/wireless communication method based on hybrid communication networks and UAV-5G base stations. Numerical studies verify that the proposed method efficiently optimizes UAV utilization for the timely reconnection of intact terminals, further enhancing the self-healing capability of CPDSs. © 2010-2012 IEEE.

关键词： 5G mobile communication systems

来源：评论

学校读者我要写书评

暂无评论

An Injection Circuit Coupling Low-DC Voltage Impedance Matching System with Flexible Resonance Points for Square-Wave Voltage Power Amplifier in EM Exploration

引用

IEEE Transactions on Power Electronics 2025年第8期40卷 11032-11050页

作者： Pang, Ying Zhu, Yongji Ji, Yanju Li, Gang Xiang, Zeng Gong, Cheng Han, Rong Tian, Wei Guo, Qun Wong, Man-Chung Lin, Jun State Key Laboratory of Deep Earth Exploration and Imaging College of Instrumentation and Electrical Engineering Jilin University Chаngсhun China College of Instrumentation and Electrical Engineering Jilin University Changchun China Tongda Electromagnetic Energy Company Ltd. Changsha China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macao China Institute of Microelectronics University of Macau Macao China Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macao China School of Optoelectronic Engineering and Instrumentation Science Dalian University of Technology Dalian China School of Electrical Engineering Guangxi University Nanning China College of Marine Electrical Engineering Dalian Maritime University Dalian China State Key Laboratory of Internet of Things for Smart City University of Macau Macao China

This paper focuses on reactive power compensation and impedance matching of square-wave voltages. Square-wave voltage is the operating voltage in electromagnetic method (EM) exploration. The characteristics of a square-wave voltage are very different from those of a sinusoidal voltage in the power grid. Although some papers proposed impedance matching converters for square-wave voltages, they solved the high DC voltage requirement problem. The problem is caused by square-wave voltage having multiple and variable spectral components. An impedance-matching converter with an injection circuit (IMFR) for square-wave voltage is proposed. IMFR is composed of a thyristor-controlled inductor and capacitor (TCLC) part and injection circuit coupling active Hbridge part. TCLC can be controlled to resonate at the highest energy fundamental frequency for damping the largest part of the DC voltage requirement. The use of TCLC offsets the varying fundamental frequency demand on the DC voltage. First, this paper gives a joint design and optimization approach for the lowest DC voltage requirement. Second, a synergistic control method of proposed IMFR is provided implementing IMFR. Third, two groups of comparative experiments show the proposed IMFR can enlarge the current by 11.8% – 38.5%. The effect on the current increase is 4.4% – 7.9% higher than using only the H-bridge of the previous method when they are operated with the same DC voltage. ©1986-2012 IEEE.

关键词： Natural frequencies

来源：评论

学校读者我要写书评

暂无评论

Connecting the Unconnectable through Feedback

arXiv

引用

arXiv 2025年

作者： Li, Yimeng Shao, Yulin The State Key Laboratory of Internet of Things for Smart City The Department of Electrical and Computer Engineering University of Macau China

Reliable uplink connectivity remains a persistent challenge for iot devices, particularly those at the cell edge, due to their limited transmit power and single-antenna configurations. This paper introduces a novel framework aimed at connecting the unconnectable, leveraging real-time feedback from access points (APs) to enhance uplink coverage without increasing the energy consumption of iot devices. At the core of this approach are feedback channel codes, which enable iot devices to dynamically adapt their transmission strategies based on AP decoding feedback, thereby reducing the critical uplink SNR required for successful communication. Analytical models are developed to quantify the coverage probability and the number of connectable APs, providing a comprehensive understanding of the system's performance. Numerical results validate the proposed method, demonstrating substantial improvements in coverage range and connectivity, particularly for devices at the cell edge, with up to a 51% boost in connectable APs. Our approach offers a robust and energy-efficient solution to overcoming uplink coverage limitations, enabling iot networks to connect devices in challenging environments. Copyright © 2025, The Authors. All rights reserved.

关键词： Energy utilization

来源：评论

学校读者我要写书评

暂无评论

ACDV: Adaptive Content Delivery for Vehicular Digital Twin Networks

引用

IEEE Transactions on Vehicular Technology 2025年第5期74卷 7084-7098页

作者： Zheng, Jinkai Luan, Tom H. Li, Guanjie Yin, Zhisheng Wu, Yuan Dong, Mianxiong Dongguan University of Technology School of Electrical Engineering and Intelligentization Dongguan523808 China Xi'an Jiaotong University School of Cyber Science and Engineering Xi'an710049 China Xidian University School of Cyber Engineering Xi'an710071 China Singapore University of Technology and Design Information Systems Technology and Design Pillar 487372 Singapore Xidian University State Key Laboratory of Isn Xi'an710071 China University of Macau State Key Laboratory of Internet of Things for Smart City 999078 China University of Macau Department of Computer Information Science 999078 China Muroran Institute of Technology Department of Sciences and Informatics Muroran05-08585 Japan

Digital Twins (DTs), serving personalized cloud-based digital assistants, hold great promise for supporting infotainment applications of the Internet of Vehicles (IoVs), in which personalized content such as high-definition maps, system updates, and social video streaming can be delivered from individualized DTs to vehicular users (VUEs) to enhance the intelligence of IoV services and improve their driving experience. This paper proposes a novel content caching framework tailored to DT-enabled IoVs, where DTs selectively cache on-demand contents on edge devices (i.e., cellular base stations and roadside units) managed by the edge service manager (ESM) along the VUE's trip to avoid backbone congestion yet save download time. However, ESMs are inherently selfish and reluctant to contribute resources to cache contents without benefits. Furthermore, considering the diverse trajectories of vehicles, it is inefficient to cache data along a single path. To address these challenges, we propose ACDV, which first models the interactions between the ESMs and DTs as a Stackelberg game to incentivize ESMs to actively participate in the content caching process. We then deploy a Markov model to predict the VUE distribution, which enables DTs to cache contents with a focus on predicted trajectories. To save storage costs, we derive an upper bound of content sizes that the VUE can download within a limited network connection time. Considering the lack of network information and users' private utility model in practical scenarios, we further develop a learning-based algorithm to find the optimal pricing scheme and content size strategies of ESMs and DTs. Through extensive simulations, we show that our proposal can effectively find the optimal strategy and achieve a fast convergence speed and high-level performance compared to the baselines. © 1967-2012 IEEE.

关键词： Markov processes

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：