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3rd International Conference on Advancement in electrical and Electronic engineering, ICAEEE 2024

作者： Islam, Md. Jahidul Cheragee, Sheikh Hasib Tarek, Muhammad Masud Gulshan, Fahmida Department of Materials and Metallurgical Engineering Dhaka1000 Bangladesh Department of Electrical and Electronic Engineering Dhaka1000 Bangladesh State University of Bangladesh Department of Computer Science and Engineering Dhaka1461 Bangladesh

ISBN: (纸本)9798350388282

In recent years, Perovskites have been a very interesting breakthrough in the field of photovoltaics because of their excellent performance with easy and less complex synthesizability, and cost-effectiveness. This instance suggests a uniquely designed solar cell with a novel perovskite, Rb2 NaGaBr6. The perovskite, used as the active layer, is analyzed through the First Principle Density Functional Theory (DFT) calculation, where the cell is simulated by the SCAPS-1D simulation tool showing a power conversion efficiency (PCE) of 26.86% for this single-junction solar cell. In order to achieve optimum efficiency, the effects of defect concentration and the thickness of the absorber layer are examined and adjusted. Here, the influence of the absorber thickness and defect concentration on fill factor, short-circuit current (J sc ), and open-circuit voltage (V oc ) were also examined in addition to their impact on PCE. Based on the insights gathered from the simulation of the designed cell, FTO /SnO 2 /Rb 2 NaGaBr 6 /CuI /W , the best results were obtained at a thickness of 0.8μm. The simulation indicated that J sc =25.02 ∼mA /cm 2 , a fill factor (FF) of 84.01%, and V oc =1.2777 ∼V , that leads to a PCE of 26.86%. © 2024 IEEE.

关键词： Perovskite

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Ising Solver using Weight Profile of Memristor Crossbar Array for Combinatorial Optimization

Ising Solver using Weight Profile of Memristor Crossbar Arra...

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2024 IEEE International Electron Devices Meeting, IEDM 2024

作者： Kim, Kyuree Youn, Sangwook Park, Jinwoo Kim, Hyungjin Department of Electrical and Computer Engineering Inha University Incheon22212 Korea Republic of Division of Materials Science and Engineering Department of Semiconductor Engineering Hanyang University Seoul04763 Korea Republic of

ISBN: (纸本)9798350365429

In this work, a weight profile design is presented for efficient Ising solver system based on a Hopfield neural network (HNN) using 32×32 memristor crossbar array. It utilizes device noise in the probabilistic decision process of simulated annealing for binary current inputs. By implementing 0 and 1 weight matrix across various conductance states in the crossbar, we experimentally solve an unweighted max-cut problem. It is confirmed that higher noise levels, concentrated in high resistance states, enable more efficient convergence to the minimum point of the HNN energy function. This approach effectively exploits intrinsic noise, reducing external hardware overhead and demonstrating feasibility for optimization problems. © 2024 IEEE.

关键词： Combinatorial optimization

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High-Speed Visible Light Communication Using Phenothiazine/Dimesitylborane Derivatives as Color Conversion materials in Semipolar Micro-LED-Based White-Light Systems

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ACS Photonics 2024年第2期11卷 489-497页

作者： Sadhu, Annada Sankar Chen, Li-Yin Pai, Yi-Hua Hsieh, Chung-An Lin, Hao-Wu Chow, Chi-Wai Kuo, Hao-Chung Department of Photonics Institute of Electro-Optical Engineering College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei11492 Taiwan College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan

Visible light communication (VLC) has emerged as a cutting-edge high-speed communication technology, poised to meet the surging capacity demands of 6G networks. Micro-light-emitting diodes (μLEDs) are considered as the light sources for achieving high-speed VLC, distinguished by their remarkable modulation bandwidths. However, achieving broadband white light emission hinges on the utilization of color-conversion materials with wide emission spectra. The transmission speed of the white-light system is inherently constrained by the characteristics of these color-conversion materials. In this work, we demonstrate CC-MP7 and CC-MP8, two derivatives of phenothiazine/dimesitylborane, as color conversion materials in a semipolar (20-21) micro-LED-based white-light system for high-speed VLC. The color conversion layers possess wide emission spectra, enabling them to achieve excellent color rendering performance when combined with blue micro-LEDs. CCMP7 and CC-MP8 demonstrate rapid photoluminescence decay characteristics, thereby enhancing the modulation bandwidth of the color-conversion layer in the white-light system. The resulting bandwidths achieved by CC-MP7 and CC-MP8 are 210 and 240 MHz, respectively, which represents an approximately 45-fold increase compared to ordinary phosphors. By combining semipolar (20-21) micro-LEDs with CC-MP7 and CC-MP8, the resulting white-light systems exhibit correlated color temperatures of 6860 and 7500 K, CIE coordinates of (0.3009, 0.3577) and (0.2958, 0.3129), and color-rendering indexes of 80 and 85, respectively. Furthermore, both systems offer high bandwidths of 1063 and 1084 MHz with the data rates of 1.72 Gbps and 1.74 Gbps using non-return-to-zero on-off keying (NRZ-OOK) format, respectively, indicating the significant potential of CC-MP7 and CC-MP8 for practical applications in VLC. © 2024 The Authors.

关键词： Bandwidth

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Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries

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escience 2022年第1期2卷 110-115页

作者： Ye Zhang Lihong Zhao Yanliang Liang Xiaojun Wang Yan Yao Department of Electrical and Computer Engineering Materials Science and Engineering ProgramUniversity of HoustonHoustonTX77204USA Texas Center for Superconductivity at the University of Houston HoustonTX77204USA

Redox polymers are a class of high-capacity, low-cost electrode materials for electrochemical energy storage, butthe mechanisms governing their cycling stability are not well understood. Here we investigate the effect of anionson the longevity of a p-dopable polymer through comparing two aqueous zinc-based electrolytes. Galvanostaticcycling studies reveal the polymer has better capacity retention in the presence of triflate anions than that withsulfate anions. Based on electrode microstructural analysis and evolution profiles of the cell stacking pressure, theorigin of capacity decay is ascribed to mechanical fractures induced by volume change of the polymer activematerials during repeated cycling. The volume change of the polymer with the triflate anion is 61% less than thatwith the sulfate anion, resulting in fewer cracks in the electrodes. The difference is related to the different anionsolvation structures—the triflate anion has fewer solvated water molecules compared with the sulfate anion,leading to smaller volume expansion. This work highlights that anions with low solvation degree are preferablefor long-term cycling.

关键词： Aqueous batteries Polymer electrode Anions Volume chang

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Retinal Blood Vessel Tracking and Diameter Estimation via Gaussian Process With Rider Optimization Algorithm

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IEEE Journal of Biomedical and Health Informatics 2024年第3期28卷 1173-1184页

作者： Ahmad, Nehal Lai, Kuan-Ting Tanveer, M. Indian Institute of Technology Indore Simrol Department of Mathematics Indore453552 India National Taipei University of Technology Department of International Program of Electrical Engineering and Computer Science Taipei106 Taiwan National Taipei University of Technology Department of Electronic Engineering Taipei106 Taiwan

Retinal blood vessels structure analysis is an important step in the detection of ocular diseases such as diabetic retinopathy and retinopathy of prematurity. Accurate tracking and estimation of retinal blood vessels in terms of their diameter remains a major challenge in retinal structure analysis. In this research, we develop a rider-based Gaussian approach for accurate tracking and diameter estimation of retinal blood vessels. The diameter and curvature of the blood vessel are assumed as the Gaussian processes. The features are determined for training the Gaussian process using Radon transform. The kernel hyperparameter of Gaussian processes is optimized using Rider Optimization Algorithm for evaluating the direction of the vessel. Multiple Gaussian processes are used for detecting the bifurcations and the difference in the prediction direction is quantified. The performance of the proposed Rider-based Gaussian process is evaluated with mean and standard deviation. Our method achieved high performance with the standard deviation of 0.2499 and mean average of 0.0147, which outperformed the state-of-the-art method by 6.32%. Although the proposed model outperformed the state-of-the-art method in normal blood vessels, in future research, one can include tortuous blood vessels of different retinopathy patients, which would be more challenging due to large angle variations. We used Rider-based Gaussian process for tracking blood vessels to obtain the diameter of retinal blood vessels, and the method performed well on the 'STrutred Analysis of the REtina (STARE) Database' accessed on Oct. 2020 (https://***/~ahoover/stare/). To the best of our knowledge, this experiment is one of the most recent analysis using this type of algorithm. © 2013 IEEE.

关键词： Blood vessels

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A Study on the Performance Improvement of Axial Flux Permanent Magnet Machines Based on Stator and Rotor Design Modifications

A Study on the Performance Improvement of Axial Flux Permane...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Yun, Jangho Grainger, Brandon Ohodnicki, Paul University of Pittsburgh Department of Mechanical Engineering and Materials Science PittsburghPA United States University of Pittsburgh Department of Electrical and Computer Engineering PittsburghPA United States

ISBN: (纸本)9798350376067

Axial flux permanent magnet (AFPM) machines have technological competitiveness for electric propulsion systems that require compact structures and high-power density. However, challenging design and manufacturing problems that reduce the cost competitiveness cause designers to limit designable variables. In this paper, the effects of slot/pole combination, semi-closed slot, magnetic wedge, and segmented PM on performance in double-sided rotor and double-sided stator geometries designed with stator open slots were investigated through 3-D finite element analysis (FEA). FEA results show that the design variables have a significant impact on torque, torque ripple, and losses. Semi-closed slots or magnetic wedges reduce PM losses for each open slot model by more than 80%, significantly reducing losses compared to segmented PMs, and also reducing torque ripple. As an alternative to stator design modification, results indicate the open slot model can be considered with a slot/pole combination for low cogging torque to reduce torque ripple and segmented PMs to reduce PM losses. © 2024 IEEE.

关键词： Stators

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MnBi IPMSM and PMASynRM Torque Density Limitations due to Temperature-Dependent Demagnetization

MnBi IPMSM and PMASynRM Torque Density Limitations due to Te...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Brody, Ryan Ohodnicki, Paul Grainger, Brandon University of Pittsburgh Department of Electrical and Computer Engineering PittsburghPA United States University of Pittsburgh Department of Mechanical Engineering and Materials Science PittsburghPA United States

ISBN: (纸本)9798350376067

Permanent magnets (PM) demagnetization occurs when applying external fields opposite the PM's polarity. To a certain degree, this effect is reversible and useful in high-speed permanent magnet synchronous motors (PMSMs) by enabling flux weakening control and reluctance torque. However, relatively large external fields cause irreversible demagnetization, damaging the magnet and, thus, the motor. In PMSMs, irreversible demagnetization can significantly limit torque density, especially when using rare earth (RE) free PMs with low coercivity. Irreversible demagnetization risk can be controlled in motor designs to increase torque density if the motor drive is designed appropriately, but the impact of this relationship has yet to be quantified statistically. Therefore, this paper does so by designing and comparing PMSMs with varying demagnetization risk and comparing their performance in terms of torque density and short circuit current. The motor designs presented here are based on the specifications for the 2011 Nissan Leaf, and electric vehicles (EVs) contribute significantly to RE PM demand by typically using interior permanent magnet motors (IPMSMs) with RE PMs. Therefore, the authors also assess demagnetization risk during EV drive cycles for the MnBi motor designs presented here. Because demagnetization effects are particularly limiting in permanent magnet assisted synchronous reluctance motors (PMASynRM) that use MnBi PMs, this paper focuses on various MnBi PMASynRM designs and compare them to a MnBi IPMSM design previously published by the authors. © 2024 IEEE.

关键词： Demagnetization

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Vertically Stackable Memcapacitor Crossbar Array based on NAND Flash Array Structure

Vertically Stackable Memcapacitor Crossbar Array based on NA...

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2024 IEEE International Electron Devices Meeting, IEDM 2024

作者： Yu, Junsu Hwang, Hwiho Kim, Hyungjin Choi, Woo Young Department of Electrical and Computer Engineering Seoul National University Seoul08826 Korea Republic of Division of Materials Science and Engineering Department of Semiconductor Engineering Hanyang University Seoul04763 Korea Republic of

ISBN: (纸本)9798350365429

In this work, a vertically stackable 4F2 memcapacitor crossbar array based on charge trap flash (CTF) is experimentally demonstrated with a TiN-Al2O3- Si3N4-SiO2-Si (TANOS) gate stack. 4-bit multi-level operation of the fabricated 24 × 48 array is verified with more than 10 years of retention and no read/write disturbance. Also, vector-matrix multiplication (VMM) operations with an error of 0.227 % are validated, along with read operations using a sensing circuit. Based on the measurement data of the planar array, the capability of performing read/write operations with a vertically stacked 3-D structure is verified through TCAD simulations. A weight transfer procedure is also provided to enhance VMM accuracy in a scaled-down vertical structure, resulting in significantly suppressed VMM errors. © 2024 IEEE.

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Direct ink writing of gradient shear-stiffening elastomer for enhanced toughness and impact resistance

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Journal of Industrial and engineering Chemistry 2025年 149卷 593-603页

作者： Gong, Liping Zhao, Chunyu Lu, Hongda Zhang, Qingtian Chen, Zexin Yang, Junjie Yang, Jinyu Sun, Shuaishuai Du, Haiping Li, Weihua School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia CAS Key Laboratory of Mechanical Behaviour and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei230027 China School of Electrical Computer and Telecommunication Engineering University of Wollongong Wollongong2522 Australia

Shear-stiffening materials have garnered significant attention due to their inherent ability to rapidly respond to changes in strain rate. However, conventional studies on these materials exhibit limited mechanical performance and insufficient structural design, hindering applications in material science and smart mechatronics. Inspired by the gradient structure of a squid beak, this study uses a direct-ink-writing (DIW) technology to develop a novel gradient shear-stiffening elastomer (GSSE). Comprehensive characterizations were conducted to optimize the printability of the shear-stiffening elastomer under various testing conditions, including rheology, compression, and tension. Additionally, the toughness and impact resistance of the elastomer were systematically investigated. It is demonstrated that the biomimetic GSSE exhibits enhanced flexibility, efficient energy dissipation, and outstanding impact resistance. Consequently, this work advances the field of shear-stiffening elastomers for diverse applications by leveraging the gradient structure design strategy to achieve superior mechanical performance under complex loading conditions. © 2025 The Author(s)

关键词： Strain rate

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Quantum receiver enhanced by adaptive learning

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Light(science & Applications) 2022年第12期11卷 3080-3086页

作者： Chaohan Cui William Horrocks Shuhong Hao Saikat Guha Nasser Peyghambarian Quntao Zhuang Zheshen Zhang James C.Wyant College of Optical Sciences University of ArizonaTucsonAZ 85721USA Department of Materials Science and Engineering University of ArizonaTucsonAZ 85721USA Department of Electrical and Computer Engineering University of ArizonaTucsonAZ 85721USA Department of Electrical and Computer Engineering University of Southern CaliforniaLos AngelesCA 90089USA Department of Electrical Engineering and Computer Science University of MichiganAnn ArborMI 48109USA

Quantum receivers aim to effectively navigate the vast quantum-state space to endow quantum information processing capabilities unmatched by classical *** date,only a handful of quantum receivers have been constructed to tackle the problem of discriminating coherent *** receivers designed by analytical approaches,however,are incapable of effectively adapting to diverse environmental conditions,resulting in their quickly diminishing performance as the operational complexities ***,we present a general architecture,dubbed the quantum receiver enhanced by adaptive learning,to adapt quantum receiver structures to diverse operational *** adaptively learned quantum receiver is experimentally implemented in a hardware platform with record-high *** the architecture and the experimental advances,the error rate is reduced up to 40%over the standard quantum limit in two coherent-state encoding schemes.

关键词： quantum coherent matched

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