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Recent Innovation in Smart and Sustainable Technology (ICRISST), International Conference on

作者： E Karunakaran Y Suresh Bhukya Nageswar Rao P S S Vivek K Aditya Department of Electrical and Electronics Engineering National Institute of Technology Surathkal Karnataka India Department of Computer Science and Business Systems Kolhapur Institute of Technology College of Engineering Kolhapur India

ISBN: (数字)9798350309140

ISBN: (纸本)9798350309157

Cascaded H-bridge (CHB) MLI have emerged as the preferred choice due to their high quality in output waveforms with low harmonic distortion. However, a key limitation in these inverters lies in the requirement of a dedicated DC source for each bridge. To overcome this challenge, there is a transition towards asymmetrical cascaded H-bridge (ACHB) MLIs, enabling the use of a variable DC source for each bridge. The variability in DC supply is achieved through a high-frequency link. This paper introduces a novel optimized switching technique for asymmetrical cascaded H-bridge (ACHB) MLIs with a single DC input incorporating a high-frequency link (HFL). The effectiveness of the suggested approach in achieving a 27-level asymmetric multilevel inverter is substantiated by experimental outcomes obtained through MATLAB/Simulink simulations.

关键词： Technological innovation Solid modeling Bridge circuits Switches Voltage Transformer cores Multilevel inverters Transformers Topology MATLAB

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Robust Control of Feeding Speed in Coal Seam Drilling Process Considering Borehole Friction

Robust Control of Feeding Speed in Coal Seam Drilling Proces...

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2024 China Automation Congress, CAC 2024

作者： Liu, Xiao Chen, Luefeng Lu, Chengda Fan, Haipeng Wu, Min Pedrycz, Witold School of Automation The Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems The Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education China University of Geosciences Wuhan430074 China Department of Electrical and Computer Engineering University of Alberta EdmontonABT6G 2R3 Canada Systems Research Institute Polish Academy of Sciences Warsaw00-901 Poland Department of Computer Engineering Istinye University Sariyer Istanbul34396 Turkey

ISBN: (纸本)9798350368604

During the coal seam drilling process, the drill string is subject to compressive deformation, compounded by unpredictable variations in formation hardness and borehole wall friction, leading to challenges in maintaining a stable feeding speed. This paper presents a novel approach by introducing uncertain parameters to describe the effects of formation hardness and borehole wall friction. Drill string axial movement model is modeled as a polyhedral system based on a lumped parameter representation. To meet industrial performance requirements, we design a robust H∞ controller to achieve consistent feeding speed control. Our simulation results demonstrate the controller’s effectiveness in ensuring system stability despite fluctuations in formation hardness and drill string friction. © 2024 IEEE.

关键词： Coal deposits

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Identification of Piecewise Affine systems with Online Deterministic Annealing

Identification of Piecewise Affine Systems with Online Deter...

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IEEE Conference on Decision and Control

作者： Christos N. Mavridis John S. Baras Department of Electrical and Computer Engineering Institute for Systems Research University of Maryland College Park USA

We propose a new online identification scheme for discrete-time piece-wise affine models based on a system of adaptive algorithms. A stochastic approximation algorithm based on online deterministic annealing runs at a slow timescale, estimating the partition of the space that defines the modes of the system. At the same time, a recursive identification algorithm, running at a higher timescale, updates the parameters of local identification models based on the estimate of the modes. Convergence results under mild assumptions are given based on the theory of two timescale stochastic approximation. In contrast to standard identification algorithms for piece-wise affine systems, the proposed approach is appropriate for online system identification using sequential data acquisition, and is computationally more efficient compared to standard algebraic, mixed-integer programming, and clustering-based methods. The progressive nature of the algorithm provides real-time control over the performance-complexity trade-off, desired in practical applications. Experimental results validate the efficacy of the proposed methodology.

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Short Blocklength Process Monitoring and Scheduling: Resolution and Data Freshness

Short Blocklength Process Monitoring and Scheduling: Resolut...

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作者： Roth, Stefan Arafa, Ahmed Sezgin, Aydin Poor, H. Vincent Institute of Digital Communication Systems Ruhr University Bochum Bochum44801 Germany The University of North Carolina at Charlotte Department of Electrical and Computer Engineering CharlotteNC28223 United States Princeton University Department of Electrical and Computer Engineering PrincetonNJ08544 United States

In cyber-physical systems (CPSs) and internet-of-things applications, various sensor-actuator pairs are deployed for control purposes which require timely online communication. The sensors are measuring information about the CPS, e.g., process systems, whereas the actuators are using the information to take control actions. These sensor-actuator pairs usually communicate via the same wireless medium and thus their transmissions need to be scheduled in time. When transmitting the process data, a short blocklength source-channel coding approach is employed to reduce data errors. We investigate the influence of the decision policy consisting of communication parameters and scheduling design on data freshness and accuracy of process monitoring systems. An age-of-information (AoI) metric is used to assess data timeliness, while the mean square error (MSE) is used to assess the precision of the predicted process values. We characterize the AoI and MSE with closed-form expressions for the blocklengths and accuracy levels, for special types of scheduling strategies, namely, round-robin and maximum-age scheduling. We optimize the coding strategies by showing an achievability region of AoI and MSE. Other priority-based scheduling policies are also investigated. It is shown that the maximum-age policy provides excellent results in terms of AoI, while priority-based scheduling performs better in terms of MSE. © 2002-2012 IEEE.

关键词： Wireless sensor networks

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QoS Improvement using Federated Learning-based Position Prediction for mobile IoT 10

QoS Improvement using Federated Learning-based Position Pred...

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10th IEEE World Forum on Internet of Things, WF-IoT 2024

作者： Zafar, Saniya Alshehri, Mohammed S. Shah, Syed Aziz Ahmad, Jawad Zafar, Adnan Khattak, Aizaz Ahmad Institute of Space Technology Department of Electrical Engineering Islamabad Pakistan Najran University College of Computer Science and Information Systems Department of Computer Science Saudi Arabia Coventry University Research Centre for Intelligent Healthcare United Kingdom Prince Mohammad Bin Fahd University Cybersecurity Center Alkhobar Saudi Arabia Edinburgh Napier University School of Computing Engineering and the Built Environment United Kingdom

ISBN: (纸本)9798350373011

The rapid advancement in mobile broadband technology has evolved wireless infrastructure influencing internet-of-things (IoTs). This evolution has made mobile IoTs (mIoTs) as centre of attention due to its potential of providing seamless connectivity to enable intelligent transportation systems with huge data demands of vehicular users. To address the ever-escalating data demands of vehicular mobile users, vehicular edge computing (VEC) and moving small cells (mSCs) play a pivotal role. mSCs together with VEC are capable to provide improved service quality for mIoTs. However, incorporating the mSCs in vehicles for mIoTs presents challenges while assigning the resources in mIoT-mSC network. This is due to the existence of time varying interference among mSCs. This work explores the distributed resource assignment mechanism for RSU assisted mIoT-mSC network formed in vehicular environment. In the proposed work, location prediction of city buses deployed with mSCs is done using federated learning (FL) which is subsequently utilized for efficient assignment of resources in mIoT-mSC network. Numerical results are provided to validate the proposed resource assignment mechanism. © 2024 IEEE.

关键词： Intelligent systems

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A Nested Ensemble Method to Bilevel Machine Learning

A Nested Ensemble Method to Bilevel Machine Learning

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Lisha Chen Momin Abbas Tianyi Chen Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY United States

Modern machine learning problems, such as hyperparameter optimization, meta learning, and adversarial training, adopt a bilevel learning formulation. Such problems involve a nested relation between inner- and outer-level problems, which often have suboptimal solutions with poor generalization ability. To address this issue, this paper proposes an ensemble method tailored to bilevel learning. Our method finds a nested ensemble of inner and outer parameters that improve generalization. We instantiate our general results with meta learning. We show theoretically and empirically that the diversity and the smoother loss landscape of the proposed ensemble methods lead to improved generalization over the state-of-the-art method.

关键词： Training Signal processing Benchmark testing Hyperparameter optimization Acoustics Ensemble learning Speech processing

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Temperature Dependence of Hot-Electron Graphene Fet Bolometric Detectors Response to Modulated Terahertz Radiation

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International Journal of High Speed Electronics and systems 2024年第4期33卷

作者： Ryzhii, Maxim Ryzhii, Victor Tang, Chao Otsuji, Taiichi Mitin, Vladimir Shur, Michael S. Department Of Computer Science And Engineering University Of Aizu Aizu-Wakamatsu Fukushima965-8580 Japan Research Institute For Electrical Communication Tohoku University Miyagi Sendai980-8577 Japan Department Of Electrical Engineering University At Buffalo Suny BuffaloNY14260 United States Department Of Electrical Computer And Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States

In this paper, we analyze the modulation characteristics and the ultimate modulation frequency of the terahertz (THz) hot-electron FET bolometers with the graphene channels (GCs), metal gate (MG), and gate barrier layers (BLs) in a wide temperature range. Our results predict that the responsivity of GC-FET bolometers decreases with decreasing operating temperature. This is attributed to a dramatic drop in the thermionic GC-MG current (characterized by the relatively large activation energy) and its modulated component when the temperature lowers. A further decrease in the temperature results in a fairly strong responsivity roll-off. In contrast, the responsivity of the GC-FET detectors with the temperature-adjusted load resistance rises with decreasing temperature because the temperature lowering leads to an increase in the electron energy relaxation time and promotes more effective heating by the impinging THz radiation. In this case, the weakening of the thermionic current is compensated by the commensurate increase in the load resistance. © 2024 World Scientific Publishing Company.

关键词： Graphene

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Redundancy parameterization and inverse kinematics of 7-DOF revolute manipulators

arXiv

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arXiv 2023年

作者： Elias, Alexander J. Wen, John T. Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute TroyNY United States

Seven degree-of-freedom (DOF) robot arms have one redundant DOF which does not change the motion of the end effector. The redundant DOF offers greater manipulability of the arm configuration to avoid obstacles and singularities, but it must be parameterized to fully specify the joint angles for a given end effector pose. For 7-DOF revolute (7R) manipulators, we introduce a new concept of generalized shoulder-elbow-wrist (SEW) angle, a generalization of the conventional SEW angle but with an arbitrary choice of the reference direction function. The SEW angle is widely used and easy for human operators to visualize as a rotation of the elbow about the shoulder-wrist line. Since other redundancy parameterizations including the conventional SEW angle encounter an algorithmic singularity along a line in the workspace, we introduce a special choice of the reference direction function called the stereographic SEW angle which has a singularity only along a half-line, which can be placed out of reach. We prove that such a singularity is unavoidable for any parameterization. We also include expressions for the SEW angle Jacobian along with singularity analysis. Finally, we provide efficient and singularity-robust inverse kinematics solutions for most known 7R manipulators using the general SEW angle and the subproblem decomposition method. These solutions are often closed-form but may sometimes involve a 1D or 2D search in the general case. Search-based solutions may be converted to finding zeros of a high-order polynomial. Inverse kinematics solutions, examples, and evaluations are available in a publicly accessible repository. © 2023, CC BY.

关键词： Industrial robots

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AC Stark Effect in an Exciton-Polariton Condensate

AC Stark Effect in an Exciton-Polariton Condensate

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Quantum 2.0, QUANTUM 2024 in Quantum 2.0 Conference and Exhibition

作者： Feldman, Sarit Panna, Dmitry Landau, N. Brodbeck, Sebastian Klembt, Sebastian Schneider, Christian Hoefling, Sven Hayat, Alex Department of Electrical and Computer Engineering Technion – Israel Institute of Technology Haifa3200003 Israel Technische Physik Physikalisches Institut Wilhelm Conrad Röntgen Research Center for Complex Material Systems Universität Würzburg WürzburgD-97074 Germany

We report the first observation of the ac Stark modulation of the energy an exciton-polariton condensate by differential reflectivity measurement and coherent oscillations. Our results enable new quantum technologies ... 详细信息

ISBN: (纸本)9781557525185

关键词： Excitons

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Single-Stage 48V-to-1V Regulator with a Half-Turn Transformer and Current-Doubler Rectifier

Single-Stage 48V-to-1V Regulator with a Half-Turn Transforme...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Xinmiao Xu Qiang Li Department of Electrical and Computer Engineering Center for Power Electronics Systems Virginia Polytechnic Institute and State University Blacksburg VA United States

ISBN: (数字)9798331516116

ISBN: (纸本)9798331516123

Single-stage 48V-to-1V regulated solutions for high-performance processors become increasingly popular. This paper presents a full-bridge transformer-based buck converter with the current-doubler rectifier. The transformer adopts a half-turn winding structure for reduced resistance and leakage inductance. Operating principles of the converter with the half-turn transformer and the converter’s optimized printed circuit board layout are illustrated. Synchronous rectifiers are integrated in high-frequency loops and are treated carefully to reduce parasitic-inductor-induced loss. With the help of recent advances in gallium nitride (GaN) and silicon transistors, a 48V-to-1.8V GaN-based prototype switching at 700 kHz is constructed, which achieves 95.34% peak efficiency, 92.79% full-load efficiency (including gating loss) and 576 W/in 3 power density with 50-A current per phase. The same hardware achieves 94.00% peak efficiency and 89.75% full-load efficiency with 55-A current per phase in 48V-to-1.0V conversion. Experimental results with 54-V input are also included in this paper, demonstrating the great potential of the single-stage solution for future data centers.

关键词： Inductance Regulators Switching frequency Windings Layout Printed circuits Rectifiers Prototypes Transformers Gallium nitride

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