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International Conference on Environment and electrical engineering (EEEIC)

作者： Mohammadmahdi Asghari Amir Ameli Mohsen Ghafouri Mohammad N. Uddin Department of Electrical and Computer Engineering Lakehead University Thunder Bay ON Canada Concordia Institute for Information Systems Engineering (CIISE) Concordia University Montreal QC Canada

ISBN: (数字)9798350355185

ISBN: (纸本)9798350355192

A meticulously crafted false data injection attack (FDIA) can effectively circumvent bad data detection mechanisms within the state estimation scheme, presenting falsified states to operators. These falsified states can lead to wrong operation decisions, potentially leading to line overloads and triggering cascading failures. Although substantial measurements are needed for executing such impactful FDIAs, the modeling of the cyber layer in vulnerability analysis of power grids is often neglected in the literature. Building on this foundation, this paper introduces a two-step vulnerability assessment approach that integrates the cyber layer into account. Initially, the minimum sets of phasor measurement units necessary to stealthily overload a transmission line is determined via a bi-level optimization problem for each line. Subsequently, Bayesian attack graphs are developed for each set to map all potential access routes for these minimal measurement sets, thereby facilitating the calculation of their accessing probability, which reflect the current vulnerability of the power system to FDIAs. The proposed methodology is tested and validated on the IEEE 39-Bus test system.

关键词： Analytical models Power measurement Power transmission lines Power system protection Transmission line measurements Phasor measurement units Bayes methods State estimation Power system faults Optimization

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Performance Assessment for Stochastic Anomaly Detectors in Industrial Alarm systems

Performance Assessment for Stochastic Anomaly Detectors in I...

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International Conference on Control and Automation (ICCA)

作者： Jing Zhou Jun Shang Tongwen Chen Department of Electrical & Computer Engineering University of Alberta Edmonton Canada Department of Control Science & Engineering Shanghai Research Institute for Intelligent Autonomous Systems Tongji University Shanghai China

ISBN: (数字)9798350354409

ISBN: (纸本)9798350354416

In recent years, stochastic detectors have gained prominence in networked systems for anomaly detection. These detectors have demonstrated advantages over their traditional counterparts, particularly in safe-guarding against data integrity attacks targeting state estimation. Despite these advancements, the impact of the detector on alarm performance-such as alarm-triggering rates at normal conditions-remains under-explored, especially in scenarios where delay timers are applied to the raw alarm sequence. This study delves into the monitoring of a correlated Gaussian process variable using stochastic detectors. An explicit formula for the alarm performance is given, highlighting how it is influenced by the duration of delay timers. The efficacy of the proposed approach is validated through numerical examples and a simplified process model.

关键词： Automation Data integrity Detectors Gaussian processes Delays Numerical models State estimation

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A CMOS LNA with Improved Multi-Path Noise-Canceling for K-Band Communications

A CMOS LNA with Improved Multi-Path Noise-Canceling for K-Ba...

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IEEE Annual Conference on Wireless and Microwave Technology (WAMICON)

作者： Chenge Hu Ziyao Wang Chunqi Shi Leilei Huang Jinghong Chen Runxi Zhang Institute of Microelectronic Circuits and Systems East China Normal University Shanghai China Department of Electrical and Computer Engineering University of Houston Houston TX USA

ISBN: (数字)9798331509606

ISBN: (纸本)9798331509613

This paper presents a transformer-based improved multi-path noise-canceling (IMNC) low noise amplifier (LNA) for K-band satellite communications. The design enhances the dual-path noise cancellation and significantly reduces the noise figure. The proposed LNA employs a three-coil transformer with dual-eight-shaped inductor to boost gain, and introduces a noise cancellation path for the common-gate transistor to optimizes noise performance. During the circuit design phase, a multicomponent integrated modeling (MIM) technique is applied, which accurately characterizes the EM field of the LNA and ensures high consistency between simulation and measurement results. The LNA, fabricated in a 40 nm CMOS process, consumes 28.8 mW of power and achieves a peak gain of 12.6 dB. Its 3-dB bandwidth ranges from 19.9 to 25 GHz with a minimum noise figure of 2 dB. The core area of the LNA is $0.16 ~\text{mm}^{2}$ .

关键词： Microwave measurement Wireless communication Noise figure K-band Noise cancellation Transformers Transistors Inductors Gain Satellite communications

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Machine learning approaches for predicting Ankle Dorsi Plantar Moments in Cerebral Palsy gait analysis: A comparative study

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Gait & Posture 2024年 113卷 198-199页

作者： Mustafa Erkam Özates Firooz Salami Sebastian I. Wolf Yunus Ziya Arslan Turkish German University Department of Electrical and Electronics Engineering- Faculty of Engineering Istanbul Turkey Heidelberg University Hospital Clinic for Orthopedics and Trauma Surgery Heidelberg Germany Turkish German University Department of Robotics and Intelligent Systems- Institute of Graduate Studies in Science and Engineering- Istanbul Turkey

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Hazard Analysis of Collaborative Automation systems: A Two-layer Approach based on Supervisory Control and Simulation

Hazard Analysis of Collaborative Automation Systems: A Two-l...

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IEEE International Conference on robotics and Automation (ICRA)

作者： Tom P. Huck Yuvaraj Selvaraj Constantin Cronrath Christoph Ledermann Martin Fabian Bengt Lennartson Torsten Kröger Intelligent Process Automation and Robotics Lab Institute of Anthropomatics and Robotics (IAR-IPR) Karlsruhe Institute of Technology India Department of Electrical Engineering Division of Systems and Control Chalmers University of Technology Gothenburg Sweden

Safety critical systems are typically subjected to hazard analysis before commissioning to identify and analyse potentially hazardous system states that may arise during operation. Currently, hazard analysis is mainly based on human reasoning, past experiences, and simple tools such as checklists and spreadsheets. Increasing system complexity makes such approaches decreasingly suitable. Furthermore, testing-based hazard analysis is often not suitable due to high costs or dangers of physical faults. A remedy for this are model-based hazard analysis methods, which either rely on formal models or on simulation models, each with their own benefits and drawbacks. This paper proposes a two-layer approach that combines the benefits of exhaustive analysis using formal methods with detailed analysis using simulation. Unsafe behaviours that lead to unsafe states are first synthesised from a formal model of the system using Supervisory Control Theory. The result is then input to the simulation where detailed analyses using domain-specific risk metrics are performed. Though the presented approach is generally applicable, this paper demonstrates the benefits of the approach on an industrial human-robot collaboration system.

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Stability Analysis and Performance Evaluation of Delayed Bilateral Telerobotic systems over a Lossy Communication Channel

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Journal of systems Science & Complexity 2021年第1期34卷 157-179页

作者： BAKHSHI Ali ALFI Alireza TALEBI Heidar Ali SOURATGAR Amir Aboulfazl YOUSEFI Mahdi Faculty of Electrical and Robotic Engineering Shahrood University of TechnologyShahrood 36199-95161Iran Power Plants Control Systems Technology Development Plan Department of monitoring and ControlNiroo Research InstituteTehran 14665-517Iran Real-Time and Robotics system Laboratory Faculty of Electrical EngineeringAmirkabir University of TechnologyHafez AvenueTehran 15914Iran Electrical and Computer Engineering Department The University of British Columbia2385East MallVan couverBC V6T 1Z4Canada

The focus of this paper is to address a novel control technique for stability and transparency analysis of bilateral telerobotic systems in the presence of data loss and time delay in the communication channel. Different control strategies have been reported to compensate the effects of time delay in the communication channel;however, most of them result in poor performance under data loss. First, a model for data loss is proposed using a finite series representation of a set of periodic continuous *** improve the performance and data reconstruction, a holder circuits is also introduced. The passivity of the overall system is provided via the wave variable technique based on the proposed model for the data loss. The stability analysis of the system is then derived using the Lyapunov theorem under the time delay and the data loss. Finally, experimental results are given to illustrate the capability of the proposed control technique.

关键词： Lossy channel passivity stability telerobotic transparency

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OTFS Channel Estimation and Detection for Channels with Very Large Delay Spread

arXiv

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arXiv 2024年

作者： Priya, Preety Hong, Yi Viterbo, Emanuele The Department of Electronics and Communication Engineering National Institute of Technology Calicut Kozhikode673601 India The Department of Electrical and Computer Systems Engineering Monash University ClaytonVIC3800 Australia

In low latency applications and in general, for overspread channels, channel delay spread is a large percentage of the transmission frame duration. In this paper, we consider OTFS in an overspread channel exhibiting a delay spread that exceeds the block duration in a frame, where traditional channel estimation (CE) fails. We propose a two-stage CE method based on a delay-Doppler (DD) training frame, consisting of a dual chirp converted from time domain and a higher power pilot. The first stage employs a DD domain embedded pilot CE to estimate the aliased delays (due to modulo operation) and Doppler shifts, followed by identifying all the underspread paths not coinciding with any overspread path. The second stage utilizes time domain dual chirp correlation to estimate the actual delays and Doppler shifts of the remaining paths. This stage also resolves ambiguity in estimating delays and Doppler shifts for paths sharing same aliased delay. Furthermore, we present a modified low-complexity maximum ratio combining (MRC) detection algorithm for OTFS in overspread channels. Finally, we evaluate performance of OTFS using the proposed CE and the modified MRC detection in terms of normalized mean square error (NMSE) and bit error rate (BER). Copyright © 2024, The Authors. All rights reserved.

关键词： Doppler effect

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Compact Spice Models for Terafets

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International Journal of High Speed Electronics and systems 2024年第1期33卷 2450004-2450004页

作者： Liu, Xueqing Ytterdal, Trond Shur, Michael Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute 110 8th Street TroyNY12180 United States Department of Electronic Systems Norwegian University of Science and Technology Trondheim7491 Norway

Field effect transistors (FETs) in plasmonic regimes of operation could detect terahertz (THz) radiation and operate as THz interferometers, spectrometers, frequency-to-digital converters and THz modulators and sources. We report on the development of compact models for Si MOS (Metal-Oxide-semiconductor) and heterostructure-based plasmonic FETs (or TeraFETs) suitable for circuit design in the THz range and based on the multi-segment unified charge control model. This model accounts for the electron inertia effect (by incorporating segmented Drude inductances), for the ballistic field effect mobility, which is proportional to the channel length, for parasitic resistances and capacitances and for the leakage current. It is validated by comparison with experimental data and TCAD simulation results. The model can be used for simulation and optimization of sub-THz and THz detectors. Our simulations use up to 200 segments in the device channel. The results are also in good qualitative agreement with the hydrodynamic simulations. Applications of our model could dramatically reduce astronomical design costs of nanoscale VLSI reaching US$1.5 billion for the 3 nm technological node. © 2024 World Scientific Publishing Company.

关键词： Plasmonics

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The Validity of a Machine Learning-Based Video Game in the Objective Screening of Attention Deficit Hyperactivity Disorder in Children Aged 5 to 12 Years

arXiv

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arXiv 2023年

作者： Zakani, Zeinab Moradi, Hadi Ghasemzadeh, Sogand Riazi, Maryam Mortazavi, Fatemeh Department of Psychology University of Tehran Iran Department of Robotics and Artificial Intelligence University of Tehran Iran Intelligent Systems Research Institute SKKU Iran Department of Electrical and Computer Engineering Boston University United States Department of Robotics and Artificial Intelligence University of Tehran Tehran Iran

Objective: Early identification of ADHD is necessary to provide the opportunity for timely treatment. However, screening the symptoms of ADHD on a large scale is not easy. This study aimed to validate a video game (FishFinder) for the screening of ADHD using objective measurement of the core symptoms of this disorder. Method: The FishFinder measures attention and impulsivity through in-game performance and evaluates the child's hyperactivity using smartphone motion sensors. This game was tested on 26 children with ADHD and 26 healthy children aged 5 to 12 years. A Support Vector Machine was employed to detect children with ADHD. results: This system showed 92.3% accuracy, 90% sensitivity, and 93.7% specificity using a combination of in-game and movement features. Conclusions: The FishFinder demonstrated a strong ability to identify ADHD in children. So, this game can be used as an affordable, accessible, and enjoyable method for the objective screening of ADHD. © 2023, CC BY-NC-ND.

关键词： Serious games

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Estimating Joint Kinematics and Muscles Forces During Robotic Rehabilitation to Detect and Counteract Reduced Ankle Mobility

Estimating Joint Kinematics and Muscles Forces During Roboti...

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IEEE International Conference on Rehabilitation robotics (ICORR)

作者： Kim K. Peper Elisabeth R. Jensen Sami Haddadin Technical University of Munich Germany Department of Computer Engineering Chair of Robotics and Systems Intelligence TUM School of Computation Information and Technology Munich Institute of Robotics and Machine Intelligence (MIRMI)

The paper presents a solution to detect active ankle joint movement while a patient undergoes therapy with a robotic lower limb rehabilitation device that neither restricts nor actively supports ankle dorsi- or plantarflexion. The presented method requires the addition of only two accelerometer sensors to the system as well as a musculoskeletal model of the lower limb. Using forward kinematics and inverse dynamics, it enables knee and ankle joint kinematic tracking in the sagittal plane and muscle force estimation. This is an extension of a previous work in which only hip joint tracking was possible and, thus, muscle force estimation was limited. The correlation results of the current validation study with 12 healthy subjects show high correlation $(R=0.88\pm 0.09)$ between the kinematics estimated with the proposed method and those calculated from a gold standard motion capture setup for all three joints (hip, knee, and ankle). The correlation results of the estimated m. tibialis anterior muscle force against electromyography measurements $(R\ =\ 0.62\pm 0.27)$ are promising and a first application to a patient data set shows potential for future clinical application.

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