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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Prasad, Ciril S. Everitt, Henry O. Naik, Gururaj V. Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States U.S. Army DEVCOM Army Research Laboratory-South HoustonTX United States

ISBN: (纸本)9781957171258

Non-Hermitian optics provides a unique platform to take advantage of absorption losses in materials and control radiative properties. We demonstrate a non-Hermitian metasurface that exhibit directional suppression of thermal radiation while maintaining transmission in mid-infrared. © Optica Publishing Group 2023 © 2023 The Author(s)

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Data-Driven Assessment of Operational and Harsh Environmental Stress Factors for Solar Inverters Using Field Measurements

Data-Driven Assessment of Operational and Harsh Environmenta...

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IEEE General Meeting Power& Energy Society

作者： Yi Luo Liming Liu Yuxuan Yuan Zhaoyu Wang Feng Qiu Shijia Zhao Murat Yildirim Electrical and Computer Engineering Iowa State University Ames IA USA Energy Systems Division Argonne National Laboratory Lemont IL USA Industrial and Systems Engineering Wayne State University Detroit MI USA

ISBN: (数字)9798350381832

ISBN: (纸本)9798350381849

The operation of inverters in distributed photovoltaic (PV) systems within distribution systems is critical for ensuring the reliability and durability of the PV system, particularly when challenged by diverse operational and environmental stress conditions. This study delves into analyzing the inverter stress factors to assess the impact of under-sizing and varying environmental stresses on the reliability and service life of PV inverters. A new operational stress metric, equivalent under-sizing rate (EUR), is proposed to quantify the actual inverter stress from the under-sizing problem. Along with the designed weather and extreme event metrics, the proposed EUR is evaluated in a real-world PV inverter dataset. To handle the censored working time variable, the Cox proportional hazards model is adopted to conduct the data-driven stress factor analysis. The regression results reveal aside from the high temperature and large temperature variance, the inverter under-sizing problem is also a significant factor that could influence the lifetime of inverters. Meanwhile, further applications and potential future directions for the proposed work are explored.

关键词： Temperature measurement Measurement Photovoltaic systems Analytical models Temperature Inverters Hazards Reliability Stress Stress measurement

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Performance Bounds for Policy-Based Reinforcement Learning Methods in Zero-Sum Markov Games with Linear Function Approximation

Performance Bounds for Policy-Based Reinforcement Learning M...

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IEEE Conference on Decision and Control

作者： Anna Winnicki R. Srikant Department of Electrical and Computer Engineering Coordinated Science Laboratory University of Illinois at Urbana-Champaign C3.ai Digital Transformation Institute

Until recently, efficient policy iteration algorithms for zero-sum Markov games that converge were unknown. Therefore, model-based RL algorithms for such problems could not use policy iteration in the planning modules of the algorithms. In an earlier paper, we showed that a convergent policy iteration algorithm can be obtained by using a commonly used technique in RL called lookahead. However, the algorithm could be applied to the function approximation setting only in the special case of linear MDPs (Markov Decision Processes). In this paper, we obtain performance bounds for policy-based RL algorithms for general settings, including one where policy evaluation is performed using noisy samples of (state, action, reward) triplets from a single sample path of a given policy.

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Nash equilibrium seeking over digraphs with row-stochastic matrices and network-independent step-sizes

arXiv

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arXiv 2023年

作者： Nguyen, Duong Thuy Anh Bianchi, Mattia Dörfler, Florian Nguyen, Duong Tung Nedić, Angelia School of Electrical Computer and Energy Engineering Arizona State University TempeAZ United States Automatic control laboratory ETH Zürich Switzerland

In this paper, we address the challenge of Nash equilibrium (NE) seeking in non-cooperative convex games with partial-decision information. We propose a distributed algorithm, where each agent refines its strategy through projected-gradient steps and an averaging procedure. Each agent uses estimates of competitors’ actions obtained solely from local neighbor interactions, in a directed communication network. Unlike previous approaches that rely on (strong) monotonicity assumptions, this work establishes the convergence towards a NE under a diagonal dominance property of the pseudo-gradient mapping, that can be checked locally by the agents. Further, this condition is physically interpretable and of relevance for many applications, as it suggests that an agent’s objective function is primarily influenced by its individual strategic decisions, rather than by the actions of its competitors. In virtue of a novel block-infinity norm convergence argument, we provide explicit bounds for constant step-size that are independent of the communication structure, and can be computed in a totally decentralized way. Numerical simulations on an optical network’s power control problem validate the algorithm’s effectiveness. © 2023, CC BY-NC-ND.

关键词： Game theory

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QUAPPROX: A FRAMEWORK FOR BENCHMARKING THE APPROXIMABILITY OF VARIATIONAL QUANTUM CIRCUIT

arXiv

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arXiv 2024年

作者： Li, Jinyang Li, Ang Jiang, Weiwen Department of Electrical and Computer Engineering George Mason University VA United States Quantum Science and Engineering Center George Mason University VA United States Pacific Northwest National Laboratory WA United States

Most of the existing quantum neural network models, such as variational quantum circuits (VQCs), are limited in their ability to explore the non-linear relationships in input data. This gradually becomes the main obstacle for it to tackle realistic applications, such as natural language processing, medical image processing, and wireless communications. Recently, there have emerged research efforts that enable VQCs to perform non-linear operations. However, it is still unclear on the approximability of a given VQC (i.e., the order of non-linearity that can be handled by a specified design). In response to this issue, we developed an automated tool designed to benchmark the approximation of a given VQC. The proposed tool will generate a set of synthetic datasets with different orders of non-linearity and train the given VQC on these datasets to estimate their approximability. Our experiments benchmark VQCs with different designs, where we know their theoretic approximability. We then show that the proposed tool can precisely estimate the approximability, which is consistent with the theoretic value, indicating that the proposed tool can be used for benchmarking the approximability of a given quantum circuit for learning tasks. Copyright © 2024, The Authors. All rights reserved.

关键词： Benchmarking

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Annapoorna – Food, Water and Medicine Delivery Teleoperated Robot with Telemedicine Facility

Annapoorna – Food, Water and Medicine Delivery Teleoperated...

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E-mobility, Power Control and Smart Systems (ICEMPS), International Conference on

作者： Rajesh Kannan Megalingam Sakthiprasad Kuttankulangara Manoharan Avinash Hegde Kota Department of Electronics and Communication Engineering Humanitarian Technology (HuT) Labs Amrita Vishwa Vidyapeetham Amritapuri India Electrical and Computer Engineering Department Digital Design Environment Laboratory (DDEL) University of Cincinnati Cincinnati OH USA

ISBN: (数字)9798350394399

ISBN: (纸本)9798350394405

Annapoorna is a tele-operated robot to deliver food, water, and medicines to COVID patients in isolation wards. It is equipped with a telemedicine facility for doctors and nurses to interact with patients remotely. This greatly reduces direct contact of doctors, nurses, and food service staff with patients during COVID or other pandemic times, thereby reducing infection risk. The battery powered robot reaches each bedside to serve food and medicines to the patients in isolation wards. The robot can be controlled by smartphone app or wireless joystick controller. The tablet attached at the top of the robot serves dual purpose. The doctors and nurses can interact with the patient with any online meeting portals like Skype, Google Hangout, Zoom etc. In addition, the operator can control the robot using the tablet camera there by saving additional cost for the camera.

关键词： COVID-19 Wireless communication Navigation Tuberculosis Telemedicine Robot vision systems Cameras

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MEMS-Silicon Chip Bonding Verification using GHz Pulse-echo Simulation and Measurements

MEMS-Silicon Chip Bonding Verification using GHz Pulse-echo ...

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IEEE International Frequency Control Symposium

作者： Shyam Trivedi Yi Xuan Yeo Mantalena Sarafianou Eva Leong Ching Wai Jaibir Sharma Daniel Ssu-Han Chen Amit Lal Kevin Tshun Chuan Chai Institute of Microeletronics Agency for Science Technology and Research (A*STAR) Singapore SonicMEMS Laboratory School of Electrical and Computer Engineering Cornell University Ithaca NY USA

This research presents a novel method to differentiate the bonding quality of a MEMS chip to a silicon substrate by using bulk acoustic wave (BAW) transducer arrays to determine the GHz ultrasonic wave transmission through the bonding interface. Prior to bonding, one-port S-parameter measurements were conducted on the array device at the wafer level to determine the mean resonance frequency (1.487 GHz) and standard deviation (33.8 MHz). The MEMS chip was then bonded to a silicon substrate using Au-AuSn bonding at a temperature <300°C, and confocal scanning acoustic microscopy (CSAM) was used to verify the bond uniformity. The bonding completion was evaluated by exciting the MEMS transducers with an RF signal of 80 ns width centered at 1.47 GHz to generate a packet of bulk acoustic waves and assess the reflected echo signals. Finite element (FE) time-domain simulations were carried out for the 2D-array to analyze the pattern and peak-to-peak amplitudes of the first four echoes, as visual inspection alone was insufficient to confirm bonding. The simulation results revealed a unique signature that indicated bonding completion: the third-echo amplitude became larger than the second-echo when the bonding percentage was >70%, due to constructive interference of ultrasonic waves reflected from the bonding interface and the substrate bottom. For fully bonded cases, the fourth echo became larger or comparable to the second echo, and first echo levels diminish by at least 20%. Electro-acoustic measurements were performed before and after bonding to confirm these distinctive signatures and categorize the devices as fully bonded, partially bonded, or unbonded.

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Integrated Optoelectronic Memory Array with Enhanced Broadband Si-based Lines for Advanced Visual Systems

Integrated Optoelectronic Memory Array with Enhanced Broadba...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Wang, Jinyong Ren, Yujing Tang, Baoshan Li, Changcun Liu, Fucai Gu, Deen School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu611731 China Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore Department of Chemical and Biomolecular Engineering National University of Singapore Singapore117583 Singapore

ISBN: (纸本)9781957171258

We present an innovative approach to optoelectronic memory that utilizes enhanced Si-based broadband lines integrated into an array to achieve stable synaptic functions, optical states and high recognition accuracy (99.64%) under near-infrared regions, paving the way for high-performance robot vision systems with advanced memory capabilities. © 2023 The Author(s)

关键词： Infrared devices

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A Generic Load Flow Solution for Droop-Controlled AC Microgrids Considering Electric Vehicle Loads 11

A Generic Load Flow Solution for Droop-Controlled AC Microgr...

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11th IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2024

作者： Meena, Ghanshyam Mathur, Akhilesh Singh, V.P. Murari, Krishna Kamalasadan, Sukumar Malaviya National Institute of Technology Department of Electrical Engineering Rajasthan Jaipur302017 India The University of Toledo Electrical Engineering and Computer Science Department ToledoOH43606 United States University of North Carolina at Charlotte Power Energy and Intelligent Systems Laboratory Epic Department of Electrical Engineering CharlotteNC28223 United States

Microgrids (MGs) have become more unpredictable due to integration of renewable generation sources. Several methods are used to solve load flow problems in MGs. Load flow analysis is a complex problem for islanded MGs due to the absence of slack bus and dependency of active power generation of droop-controlled DGs on frequency. In this paper, a Modified Newton Raphson (MNR) approach is used to perform load flow analysis of isolated MGs considering various types of electric vehicle (EV) loads. The presented method has been validated on 6-bus and 38-bus test systems of the islanded microgrid to give an accurate and simple approach for computing the load flow solutions. © 2024 IEEE.

关键词： Islanding

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Graphene Bridge Heterostructure Devices for Negative Differential Transconductance Circuit Applications

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Nano-Micro Letters 2023年第2期15卷 161-171页

作者： Minjong Lee Tae Wook Kim Chang Yong Park Kimoon Lee Takashi Taniguchi Kenji Watanabe Min‑gu Kim Do Kyung Hwang Young Tack Lee Department of Electrical and Computer Engineering Inha UniversityIncheon 22212Republic of Korea Department of Materials Science and Engineering The University of Texas at DallasRichardsonTX 75080USA Center for Opto‑Electronic Materials and Devices Post‑Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Physics Kunsan National UniversityGunsan 54150Republic of Korea Advanced Materials Laboratory National Institute for Materials ScienceTsukuba 305‑0044Japan Department of Information and Communication Engineering Inha UniversityIncheon 22212Republic of Korea Division of Nanoscience and Technology KIST SchoolUniversity of Science and Technology(UST)Seoul 02792Republic of Korea Department of Electronic Engineering Inha UniversityIncheon 22212Republic of Korea

Two-dimensional van der Waals(2D vdW)material-based heterostructure devices have been widely studied for high-end electronic applications owing to their heterojunction *** this study,we demonstrate graphene(Gr)-bridge heterostructure devices consisting of laterally series-connected ambipolar semiconductor/Gr-bridge/n-type molybdenum disulfide as a channel material for field-effect transistors(FET).Unlike conventional FET operation,our Gr-bridge devices exhibit nonclassical transfer characteristics(humped transfer curve),thus possessing a negative differential *** phenomena are interpreted as the operating behavior in two series-connected FETs,and they result from the gate-tunable contact capacity of the Gr-bridge ***-value logic inverters and frequency tripler circuits are successfully demonstrated using ambipolar semiconductors with narrow-and wide-bandgap materials as more advanced circuit applications based on non-classical transfer ***,we believe that our innovative and straightforward device structure engineering will be a promising technique for future multi-functional circuit applications of 2D nanoelectronics.

关键词： Graphene bridge Heterostructure device Non-classical transfer characteristics Multi-value logic inverter Frequency tripler

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