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Dual-Module Ultrawide Dynamic-Range High-Power Rectifier for WPT Systems

Energies 2024年第11期17卷 2707页

作者： Yu, Xiaochen Zhang, Jinyao Liu, Minzhang Yang, Xiantao Huang, Yi Yen, Ta-Jen Zhou, Jiafeng Department of Electrical Engineering and Electronics University of Liverpool LiverpoolL69 3GJ United Kingdom International Intercollegiate Ph.D. Program National Tsing Hua University Hsinchu300044 Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu300044 Taiwan

Rectifier plays a pivotal role in wireless power transfer systems. While numerous studies have concentrated on enhancing efficiency and bandwidth at specific high-power levels, practical scenarios often involve unpredictable power inputs. Consequently, a distinct need arises for a rectifier that demonstrates superior efficiency across a broad range of input power levels. This paper introduces a high-power RF-to-DC rectifier designed for WPT applications, featuring an ultrawide dynamic range of input power. The rectification process leverages a GaN (gallium nitride) high electron mobility transistor (HEMT) to efficiently handle high power levels up to 12.6 W. The matching circuit was designed to ensure that the rectifier will operate in class-F mode. A Schottky diode is incorporated into the design for relatively lower-power rectification. Seamless switching between the rectification modes of the two circuits is accomplished through the integration of a circulator. The proposed rectifier exhibits a 27.5 dB dynamic range, achieving an efficiency exceeding 55% at 2.4 GHz. Substantial improvement in power handling and dynamic range over traditional rectifiers is demonstrated. © 2024 by the authors.

关键词： Gallium nitride

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Recent progress in undoped group-IV heterostructures for quantum technologies

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Materials for Quantum Technology 2024年第1期4卷 012001-012001页

作者： Tai, Chia-Tse Li, Jiun-Yun Department of Electrical Engineering National Taiwan University Taipei10617 Taiwan Graduate Institute of Electronics Engineering National Taiwan University Taipei10617 Taiwan Taiwan Semiconductor Research Institute Hsin-Chu30078 Taiwan Graduate School of Advanced Technology National Taiwan University Taipei10617 Taiwan

Silicon has been a core material for digital computing owing to its high mobility, stability oxide interface, mature manufacturing technologies for more than half a century. While Moore’s law seems to further advance via various technologies to extend its expiration date, some intractable problems that requires processing times growing exponentially cannot be solved in a reasonable scale of time. Meanwhile, quantum computing is a promising tool to perform calculations much more efficiently than classical computing for certain types of problems. To realize a practical quantum computer, quantum dots on group-IV semiconductor heterostructures are promising due to the long decoherence time, scalability, and compatibility with the Si very-large-scale integrated technology. In this review, we start with the advancement of group-IV undoped heterostructures since 2000 and review carrier transport properties in these undoped heterostructure. We also review the hole effective masses, spin-orbit coupling, and effective g-factors in the Ge-based heterostructures and conclude with a brief summary. © 2024 The Author(s).

关键词： Heterojunctions

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MSEMG: Surface Electromyography Denoising with a Mamba-based Efficient Network

arXiv

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arXiv 2024年

作者： Liu, Yu-Tung Wang, Kuan-Chen Chao, Rong Siniscalchi, Sabato Marco Yeh, Ping-Cheng Tsao, Yu Department of Electronics and Electrical Engineering National Yang Ming Chiao Tung University Taiwan Graduate Institute of Communication Engineering National Taiwan University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taiwan University of Palermo Italy Research Center for Information Technology Innovation Academic Sinica Taiwan

Surface electromyography (sEMG) recordings can be contaminated by electrocardiogram (ECG) signals when the monitored muscle is closed to the heart. Traditional signal processing-based approaches, such as high-pass filtering and template subtraction, have been used to remove ECG interference but are often limited in their effectiveness. Recently, neural network-based methods have shown greater promise for sEMG denoising, but they still struggle to balance both efficiency and effectiveness. In this study, we introduce MSEMG, a novel system that integrates the Mamba state space model with a convolutional neural network to serve as a lightweight sEMG denoising model. We evaluated MSEMG using sEMG data from the Non-Invasive Adaptive Prosthetics database and ECG signals from the MIT-BIH Normal Sinus Rhythm Database. The results show that MSEMG outperforms existing methods, generating higher-quality sEMG signals using fewer parameters. © 2024, CC BY.

关键词： High pass filters

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Research on Model and Algorithm of Location-Inventory-Routing Problem Based on Environmental Protection

Research on Model and Algorithm of Location-Inventory-Routin...

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Computer Technologies and Development (TechDev), International Conference on

作者： Jiacheng Li Masato Noto Yang Zhang Department of Electrical Electronics and Information Engineering Kanagawa University Yokohama Japan Graduate School of Science and Engineering Hosei University Tokyo Japan

With the advent of the post-industrial era, the problem of environmental degradation caused by the increase in carbon dioxide has become increasingly prominent. As a main source of greenhouse gas emissions, the operation of the logistics supply chain has been included as a major emission reduction target by the government. Traditional location-inventory-routing problem (LIRP) seldom involves the research of low-carbon development models and are therefore unsuitable for the economic and environmental dual-oriented development strategy advocated by society. On the basis of the traditional LIRP, this paper studies site selection, inventory, and route integration for low-carbon material distribution, constructs a low-carbon supply chain network model, and uses an improved sparrow search algorithm to solve the problem of maximizing the supply chain economy and overall optimization of the environment. Experimental verification shows that the proposed strategy is practical and effective in solving this problem.

关键词：

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C3-SL: CIRCULAR CONVOLUTION-BASED BATCH-WISE COMPRESSION FOR COMMUNICATION-EFFICIENT SPLIT LEARNING

arXiv

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arXiv 2022年

作者： Hsieh, Cheng-Yen Chuang, Yu-Chuan Wu, An-Yeu Department of Electrical Engineering National Taiwan University Taipei Taiwan Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan

Most existing studies improve the efficiency of Split learning (SL) by compressing the transmitted features. However, most works focus on dimension-wise compression that transforms high-dimensional features into a low-dimensional space. In this paper, we propose circular convolution-based batch-wise compression for SL (C3-SL) to compress multiple features into one single feature. To avoid information loss while merging multiple features, we exploit the quasi-orthogonality of features in high-dimensional space with circular convolution and superposition. To the best of our knowledge, we are the first to explore the potential of batch-wise compression under the SL scenario. Based on the simulation results on CIFAR-10 and CIFAR-100, our method achieves a 16x compression ratio with negligible accuracy drops compared with the vanilla SL. Moreover, C3-SL significantly reduces 1152x memory and 2.25x computation overhead compared to the state-of-the-art dimension-wise compression method. Copyright © 2022, The Authors. All rights reserved.

关键词： Efficiency

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Obstacle-Avoiding Multiple Redistribution Layer Routing with Irregular Structures*

Obstacle-Avoiding Multiple Redistribution Layer Routing with...

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IEEE International Conference on Computer-Aided Design

作者： Yen-Ting Chen Yao-Wen Chang Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

In advanced packages, redistribution layers (RDLs) are extra metal layers for high interconnections among the chips and printed circuit board (PCB). To better utilize the routing resources of RDLs, published works adopted flexible vias such that they can place the vias everywhere. Furthermore, some regions may be blocked for signal integrity protection or manually prerouted nets (such as power/ground nets or feeding lines of antennas) to achieve higher performance. These blocked regions will be treated as obstacles in the routing process. Since the positions of pads, obstacles, and vias can be arbitrary, the structures of RDLs become irregular. The obstacles and irregular structures substantially increase the difficulty of the routing process. This paper proposes a three-stage algorithm: First, the layout is partitioned by a method based on constrained Delaunay triangulation (CDT). Then we present a global routing graph model and generate routing guides for unified-assignment netlists. Finally, a novel tile routing method is developed to obtain detailed routes. Experiment results demonstrate the robustness and effectiveness of our proposed algorithm.

关键词： Design automation Printed circuits Layout Metals Integrated circuit interconnections Routing Robustness

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Optimization of Contactless Distribution in the Post-COVID Era

Optimization of Contactless Distribution in the Post-COVID E...

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IEEE International Conference on Intelligent Transportation engineering (ICITE)

作者： Yang Zhang Jiacheng Li Lei Li Graduate School of Science and Engineering Hosei University Tokyo Japan Department of Electrical Electronics and Information Engineering Kanagawa University Yokohama Japan

During an emergency, timely and effective distribution of emergency supplies is critical in rescue. In the context of Covid-19, given the difficulties in distributing supplies to communities due to super infectious viruses, unmanned vehicle distribution is studied by taking into account the priority and satisfaction of communities to improve distribution safety and effectiveness of supplies. Furthermore, the influence of distribution time on the overall efficiency is also taken into account, thus ultimately establishing an unmanned distribution model with the shortest distribution time while meeting community satisfaction. The improved whale algorithm is used to solve the dual-objective model and compared with the basic whale optimization algorithm. The results show that the improved whale algorithm demonstrates better convergence, searchability, and stability. The constructed model can scientifically distribute daily necessities to communities while considering their priority and satisfaction.

关键词： COVID-19 Whales Transportation Stability analysis Whale optimization algorithms Safety Planning

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Si Metal-Oxide-Semiconductor and Si/SiGe Heterostructure Quantum Dots

Si Metal-Oxide-Semiconductor and Si/SiGe Heterostructure Qua...

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2022 International Symposium on VLSI Technology, Systems and Applications, VLSI-TSA 2022

作者： Wu, Yu-Jui Chiang, Chih-Ying Tsao, Hung-Yu Li, Tsung-Ying Wang, Tz-Ming Lin, Min-Jui Liu, Chia-You Yeh, Ching-Chen Yang, Cheng-Hsueh Liang, Chi-Te Li, Jiun-Yun National Taiwan University Graduate Institute of Electronics Engineering Taipei10617 Taiwan National Taiwan University Department of Electrical Engineering Taipei10617 Taiwan National Taiwan University Graduate Institute of Applied Physics Taipei10617 Taiwan National Taiwan University Graduate School of Advanced Technology Taipei10617 Taiwan National Applied Research Laboratories Taiwan Semiconductor Research Institute Hsinchu30091 Taiwan

ISBN: (纸本)9781665409230

In this work, we demonstrate Coulomb blockade for both Si metal-oxide-semiconductor (MOS) nanowire and Si/SiGe heterostructure finger-type quantum dots (QDs). Clear quantum oscillations of the QD conductance were observed at temperatures of 23 mK to 1.5 K. Charge stability diagrams with unambiguous boundaries were also demonstrated at 23 mK. © 2022 IEEE.

关键词： Semiconductor quantum dots

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Sustainable Next-generation Color Converters of P. harmala Seed Extracts for Solid-State Lighting

arXiv

引用

arXiv 2023年

作者： Erdem, Talha Orenc, Ali Akcan, Dilber Duman, Fatih Soran-Erdem, Zeliha Department of Electrical-Electronics Engineering Abdullah Gül University Kayseri Turkey Erciyes University Kayseri Turkey Bioengineering Graduate Program Abdullah Gül University Kayseri Turkey Department of Biology Erciyes University Kayseri Turkey Department of Engineering Sciences Abdullah Gül University Kayseri Turkey

Traditional solid-state lighting relies on color converters with a serious environmental footprint. As an alternative, natural materials such as plant extracts could be employed if their low quantum yield (QYs) in liquid and solid states were higher. With this motivation, here, we investigate the optical features of P. harmala extract in water, develop its efficient color-converting solids using a facile, sustainable, and low-cost method, and integrate it with a light-emitting diode. To obtain a high-efficiency solid host for the P. harmala-based fluorophores, we optically and structurally compared two crystalline and two cellulose-based platforms. Structural characterizations indicate that sucrose crystals, cellulose-based cotton, and paper platforms allow fluorophores to be distributed relatively homogenously as opposed to the KCl crystals. Optical characterizations reveal that the extracted solution and the extract-embedded paper possess QYs of 75.6% and 44.7%, respectively, whereas the QYs of the cotton, sucrose, and KCl crystals remain below 10%. Subsequently, as a proof-of-concept demonstration, we integrate the as-prepared efficient solid of P. harmala for the first time with a light-emitting diode (LED) chip to produce a color-converting LED. The resulting blue-emitting LED achieves a luminous efficiency of 21.9 lm/Welect with CIE color coordinates of (0.139,0.070). With these results, we bring plant-based fluorescent biomolecules to the stage of solid-state lighting. We believe that they hold great promise as next-generation, environmentally friendly organic color converters for lighting applications. © 2023, CC BY-NC-ND.

关键词： Color

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Gallium Oxide as Photonic Integrated Platforms in the UV-Visible Spectra

Gallium Oxide as Photonic Integrated Platforms in the UV-Vis...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Zhou, Jingan Zhao, Xuan Xu, Rui Zhang, Xiang Fu, Kai Li, Tao Xu, Mingfei Luo, Shisong He, Ziyi Robinson, Jacob T. Zhu, Hanyu Ajayan, Pulickel M. Zhang, Xiaodong Zhao, Yuji Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States School of Electrical Computer and Energy Engineering Arizona State University TempeAZ85287 United States Nanofabrication facility Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Jiangsu Suzhou215123 China

We report the Ga2O3 as photonic integrated platforms and its nonlinear optical effects in the UV-visible spectra. A low propagation loss of 3.7 dB/cm and second-order susceptibility of x(2)=4.89xl03pm/V were obtained.... 详细信息

ISBN: (纸本)9781957171258

关键词： Gallium compounds

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