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Innovative Smart Grid Technologies (ISGT)

作者： Wei Qiu He Yin Yuru Wu Chujie Zeng Chang Chen Yuqing Dong Yilu Liu Department of Electrical Engineering & Computer Science The University of Tennessee Knoxville TN USA Oak Ridge National Laboratory ORNL Knoxville TN USA

ISBN: (数字)9798350313604

ISBN: (纸本)9798350313611

Data security and cyberattack have become critical issues in the distributed power system where adversaries can swap the source information of sensors or even spoof and alter measurements. However, the cyber security of the power system is challenged by the unpredictability and stealth of the spoofing attacks. To protect the data security at the grid edge, this paper developed a synchrophasor data spoofing attack detection framework based on the time-frequency feature extraction techniques including the short-time Fourier transform (STFT) and object detection network for real-time synchrophasor data categorization and spoofing attack localization. The proposed approach outperforms earlier work in terms of spoofing attack detection and offers a vital localization function employing distributed synchrophasor sensors.

关键词： YOLO Location awareness Time-frequency analysis Visualization Data security Image edge detection Soft sensors

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New Results in Stabilization of Uncertain Nonholonomic systems:An Event-Triggered Control Approach

引用

Journal of systems Science & Complexity 2021年第5期34卷 1953-1972页

作者： LIU Tengfei ZHANG Pengpeng WANG Mengxi JIANG Zhong-Ping State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110004China. Department of Electrical and Computer Engineering New York University370 Jay StreetBrooklynNY 11201USA

This paper reports latest developments in event-triggered and self-triggered control of uncertain nonholonomic systems in the perturbed chained *** order to tackle the effects of drift uncertain nonlinearities,nonholonomic constraints and nonsmooth aperiodic sampling in eventbased control,a novel systematic design scheme is proposed by integrating set-valued maps with stateseparation and state-scaling *** stability analysis of the closed-loop event-triggered control system is based on the cyclic-small-gain techniques that overcome the limitation of Lyapunov theory in the construction of Lyapunov functions for nonsmooth dynamical systems and enjoy inherent robustness properties due to the use of gain-based characterization of robust *** specifically,the closed-loop event-triggered control system is transformed into an interconnection of multiple input-tostate stable systems,to which the cyclic-small-gain theorem is applied for robust stability *** self-triggered mechanisms are also developed as natural extensions of the event-triggered control *** proposed event-based control design approach is new and original even when the system model is reduced to the ideal unperturbed chained ***,the proposed methodology is also applicable to a broader class of nonholonomic systems subject to state and input-dependent *** efficacy of the obtained event-triggered controllers is validated by a benchmark example of mobile robots subject to parametric uncertainties and a measurement noise such as bias in the orientation.

关键词： Event-triggered control nonholonomic systems self-triggered control stabilization

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Stress Matrix-Based Formation Control of Multi-Agent systems with Discrete-Time Communication

Stress Matrix-Based Formation Control of Multi-Agent Systems...

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International Conference on systems and Control (ICSC)

作者： Okechi Onuoha Brendan Chijioke Ubochi Suleiman Kurawa Zezhi Tang Changshun Wu Yi Dong School of Physics Engineering and Computer Science (SPECS) University of Hertfordshire UK The Department of Electrical and Electronic Engineering Federal University of Technology Akure Nigeria The Department of Electrical Engineering University of Manchester UK The Department of Automatic Control and Systems Engineering University of Sheffield UK University Grenoble Alpes Grenoble France The School of Electronics & Computer Science University of Southampton UK

ISBN: (数字)9798331531812

ISBN: (纸本)9798331531829

This study addresses the affine formation maneuver control of cooperative multi-agent systems (MAS) having periodic inter-agent communication for both static and dynamic leader cases. Here, we focus on the leader-follower MASs. The primary aim of the control system is to steer the entire collection of agents to produce required patterns (geometric) along with any required maneuver through the direct control of only few a selected agents referred to as leaders. Most of the existing works are constrained to either the individual agents communicate with each other in continuous-time or the sample-data scenario where the leaders are stationary or have constant acceleration or velocities. Here, we consider the scenarios where the velocities of the leaders can be time-varying or constant. Here, different cases are addressed and some control laws are proposed. Conditions are established to help guarantee the overall stability of the systems. A simulation study is employed for the illustration of our proposed laws.

关键词： Target tracking Simulation Accelerated aging Control systems Formation control Stability analysis Stress Time-varying systems Multi-agent systems

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Federated Learning for User Mobility Classification in 5G Heterogeneous Networks

Federated Learning for User Mobility Classification in 5G He...

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IEEE Conference on Vehicular Technology (VTC)

作者： Syed Maaz Shahid SungKyung Kim Sungoh Kwon Department of Electrical Electronic and Computer Engineering University of Ulsan Ulsan South Korea Mobile Telecommunication Research Laboratory ETRI Daejeon South Korea

ISBN: (数字)9798350387414

ISBN: (纸本)9798350387421

In this work, we propose a distributed learning framework that classifies users' transportation modes by leveraging heterogeneous networks (HetNets) architecture and employing a federated learning (FL) algorithm. The ultra-densification of small cells and the dynamic mobility of users impact performance by triggering unnecessary handovers. Therefore, information on user mobility allows the network to perform handover management more intelligently and efficiently. The proposed machine learning framework adopts distributed learning using a federated learning algorithm to detect transportation modes, including driving a car, riding a bicycle, walking, and running. In the proposed framework, local models are trained at small cells using user history information inherently distributed on the network side. A macro cell aggregates the local models to get a global model for classifying the transportation modes of users. Training the local models by small cells over user history information addresses critical FL issues, such as non-independent and identically distributed data and system heterogeneity. Simulation results demonstrate that the proposed framework achieves an accuracy of 98.85% in classifying transportation modes, utilizing input features extracted from user history information.

关键词： computer aided instruction Accuracy Federated learning Distance learning Transportation Distributed databases computer architecture

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Temperature-dependent optical constants of nanometer-thin flakes of Fe(Te,Se) superconductor in the visible and near-infrared regime

arXiv

引用

arXiv 2024年

作者： Pattanayak, Aswini K. Rout, Jagi Jha, Pankaj K. Quantum Technology Laboratory 〈Q|T|L〉 Department of Electrical Engineering and Computer Science Syracuse University SyracuseNY13244 United States

Iron chalcogenides superconductors, such as Fe(Te,Se) have recently garnered significant attention due to their simple crystal structure with a relatively easy synthesis process, high-temperature superconductivity, intrinsic topological band structure, and an unconventional pairing of superconductivity with ferromagnetism. Here, we report the complex in-plane refractive index measurement of nanometer-thin Fe(Te,Se) flake exfoliated from a single crystal FeTe0.6Se0.4 for photon wavelengths from 450 to 1100 nm over a temperature range from 4 K to 295 K. The results were obtained by employing a two-Drude model for the dielectric function of Fe(Te,Se), a multiband superconductor, and fitting the absolute optical reflection spectra using the transfer matrix method. A high extinction coefficient in the visible to near-infrared range makes nanometer-thin Fe(Te,Se) flakes a promising material for photodetection applications. Copyright © 2024, The Authors. All rights reserved.

关键词： Single crystals

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How to Make Money From Fresh Data: Subscription Strategies in Age-Based systems

How to Make Money From Fresh Data: Subscription Strategies i...

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IEEE Conference on Global Communications (GLOBECOM)

作者： Priyanka Kaswan Melih Bastopcu Sennur Ulukus S. Rasoul Etesami Tamer Başar Department of Electrical and Computer Engineering University of Maryland College Park MD Coordinated Science Laboratory University of Illinois Urbana Champaign Urbana IL

ISBN: (数字)9798350351255

ISBN: (纸本)9798350351262

We consider a communication system consisting of a server that tracks and publishes updates about a time-varying data source or event, and a gossip network of users interested in closely tracking the event. The timeliness of the information is measured through the version age of information. The users wish to have their expected version ages remain below a threshold, and have the option to either rely on gossip from their neighbors or subscribe to the server directly to follow updates about the event if the former option does not meet the timeliness requirements. The server wishes to maximize its profit by increasing the number of subscribers and reducing costs associated with the frequent sampling of the event. We model the problem setup as a Stackelberg game between the server and the users, where the server commits to a frequency of sampling the event, and the users make decisions on whether to subscribe or not. As an initial work, we focus on directed networks with unidirectional flow of information and obtain the optimal equilibrium strategies for all the players. We provide simulation results to confirm the theoretical findings and provide additional insights.

关键词： Costs Communication systems Soft sensors Simulation Stars Games Information age Servers Global communication Time-varying systems

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Towards Explainable, Safe Autonomous Driving with Language Embeddings for Novelty Identification and Active Learning: Framework and Experimental Analysis with Real-World Data Sets

arXiv

引用

arXiv 2024年

作者： Greer, Ross Trivedi, Mohan M. Laboratory for Intelligent and Safe Automobiles Department of Electrical and Computer Engineering University of California San Diego La Jolla CA92092 United States

This research explores the integration of language embeddings for active learning in autonomous driving datasets, with a focus on novelty detection. Novelty arises from unexpected scenarios that autonomous vehicles struggle to navigate, necessitating higher-level reasoning abilities. Our proposed method employs language-based representations to identify novel scenes, emphasizing the dual purpose of safety takeover responses and active learning. The research presents a clustering experiment using Contrastive Language-Image Pretrained (CLIP) embeddings to organize datasets and detect novelties. We find that the proposed algorithm effectively isolates novel scenes from a collection of subsets derived from two real-world driving datasets, one vehicle-mounted and one infrastructure-mounted. From the generated clusters, we further present methods for generating textual explanations of elements which differentiate scenes classified as novel from other scenes in the data pool, presenting qualitative examples from the clustered results. Our results demonstrate the effectiveness of language-driven embeddings in identifying novel elements and generating explanations of data, and we further discuss potential applications in safe takeovers, data curation, and multi-task active learning. Note to Practitioners—The processes of data collection, curation, and annotation are important in building massive but learning-efficient datasets towards a variety of applications in autonomous driving. Using the diversity-based sampling techniques presented in this research at the curation stage of data management can help in identifying unique samples to be annotated or analyzed, potentially saving arduous hours of fine-grained human labelling. Accordingly, such curation steps, especially with the explainability feature highlighted in this research, can indicate areas where data may be lacking in the current set, offering ideas for fleet management to fill gaps in the data collection process.

关键词： Anomaly detection

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On the Coding Capacity of Reverse-Complement and Palindromic Duplication-Correcting Codes

arXiv

引用

arXiv 2023年

作者： Yohananov, Lev Schwartz, Moshe School of Electrical and Computer Engineering Ben-Gurion University of the Negev Beer Sheva8410501 Israel Department of Electrical and Computer Engineering Institute for Systems Research University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering McMaster University HamiltonONL8S 4K1 Canada

We derive the coding capacity for duplication-correcting codes capable of correcting any number of duplications. We do so both for reverse-complement duplications, as well as palindromic (reverse) duplications. We show that except for duplication-length 1, the coding capacity is 0. When the duplication length is 1, the coding capacity depends on the alphabet size, and we construct optimal codes. Copyright © 2023, The Authors. All rights reserved.

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Guest Editorial Special Issue on Near-Field Communications (NFCs) in Internet of Everything

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IEEE Internet of Things Journal 2025年第12期12卷 18459-18460页

作者： Pin-Han Ho Miaowen Wen Zhiguo Ding Marco Di Renzo Wei Duan Department of Electrical and Computer Engineering University of Waterloo Waterloo ON Canada School of Electronic and Information Engineering South China University of Technology Guangzhou China Department of Computer Communication Engineering Khalifa University Abu Dhabi UAE Intelligent Physical Communications group in the Laboratory of Signals and Systems (L2S) Paris-Saclay University Gif-sur-Yvette France School of Information Science and Technology Nantong University Nantong China

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Fine Scale Partial Coherent Model Based on lidar Elevation Measurements for GNSS-R Applications 34

Fine Scale Partial Coherent Model Based on lidar Elevation M...

引用

34th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2021

作者： Ren, Bowen Zhu, Jiyue Bringer, Alexandra Tsang, Leung Johnson, Joel University of Michigan Radiation Laboratory Department of Electrical Engineering and Computer Science Ann ArborMI48109-2122 United States The Ohio State University ElectroScience Laboratory Department of Electrical and Computer Engineering ColumbusOH43212 United States

ISBN: (纸本)9789463968027

In GNSS-R (Global Navigation Satellite System Reflectometry) land applications, bistatic scattering occurs in the vicinity of the specular direction, and the scattered waves can include both coherent and incoherent components. A description of land surfaces roughness is required to predict GNSS-R specular scattering. Here we consider roughness on three distinct length scales: a microwave roughness f1(x, y) with correlation lengths of 10 centimeters, a coarse scale 30-meter planar topography f3(x,y) based on digital elevation model (DEM) data, and a fine scale topography f2(X,y) between these two length scales. The fine scale topography represents the length scales in which scattered waves can transition from coherence to partial coherence to incoherence. In this paper, we investigate f2(x, y) using recent airborne lidar measurements of land surface heights. Using f = f1+ f2+ f3, fine scale partial coherent FPCN and FPCP models are applied to predict bistatic scattering coefficients near the specular direction for 30m surface area. Here 'fine scale' means the fine scale topography of f2(x, y) is included. The model uses complex electric field summation and Monte Carlo simulations within a large area. For non-overlapping large areas, we use intensity summations as in radiative transfer theory. We consider a fine scale partial coherent numerical model (FPCN) that applies numerical integration to the Kirchhoff integral using 2 cm discretization. The fine scale partial coherent patch model (FPCP) uses planar patches o fL size, where L is less than the correlation length of f2. Numerical illustrations show that the results of the FPCN and FPCP are in good agreement with each other. Comparisons are also made with geometric optics model (GO) with and without the attenuation factor of microwave roughness. © 2021 URSI.

关键词： Surface roughness

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