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International Conference on Unmanned Aircraft Systems (ICUAS)

作者： Vinícius Pacheco Bacheti Alexandre Santos Brandão Pedro Castillo Rogelio Lozano Mário Sarcinelli-Filho The Graduate Program on Electrical Engineering Federal University of Espírito Santo Vitória ES Brazil The Department of Electrical Engineering Federal University of Viçosa Viçosa MG Brazil Heudiasyc Laboratory CNRS UMR 7253 Universite de Technologie de Compiegne Compiegne France

ISBN: (数字)9798350357882

ISBN: (纸本)9798350357899

This paper addresses the problem of controlling two distinct formations of robots interacting with one another. In order to do that, two different approaches for a line structure are defined and a controller based on virtual structures is used, as well as a low level controller in order to compensate for the dynamics of each robot. Tying both controllers is a multilayer structure responsible for the overall control. Simulations and experiments show the controllers working with different levels of complexity and help validate the proposed method.

关键词： Shape Null space Entertainment industry Kinematics Nonhomogeneous media Formation control Trajectory

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Set-Point Tracking MPC with Avoidance Features

arXiv

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arXiv 2023年

作者： Santos, Marcelo A. Ferramosca, Antonio Raffo, Guilherme V. Graduate Program in Electrical Engineering Federal University of Minas Gerais MG Belo Horizonte31270-901 Brazil Department of Management Information and Production Engineering University of Bergamo Via Marconi 5 BG Dalmine24044 Italy Department of Electronics Engineering Federal University of Minas Gerais MG Belo Horizonte31270-901 Brazil

This work proposes a finite-horizon optimal control strategy to solve the tracking problem while providing avoidance features to the closed-loop system. Inspired by the set-point tracking model predictive control (MPC) framework, the central idea of including artificial variables into the optimal control problem is considered. This approach allows us to add avoidance features into the set-point tracking MPC strategy without losing the properties of an enlarged domain of attraction and feasibility insurances in the face of any changing reference. Besides, the artificial variables are considered together with an avoidance cost functional to establish the basis of the strategy, maintaining the recursive feasibility property in the presence of a previously unknown number of regions to be avoided. It is shown that the closed-loop system is recursively feasible and input-to-state-stable under the mild assumption that the avoidance cost is uniformly bounded over time. Finally, two numerical examples illustrate the controller behavior. © 2023, CC BY-NC-ND.

关键词： Model predictive control

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System for the analysis of human balance based on accelerometers and support vector machines

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Computer Methods and programs in Biomedicine Update 2023年 4卷

作者： Pinheiro, V.C. do Carmo, J.C. Nascimento, F.A. de O. Miosso, C.J. Electrical Engineering Graduate Program Department of Electrical Engineering University of Brasília DF Brasília 70910-900 Brazil Biomedical Engineering Graduate Program University of Brasília at Gama Área Especial Projeção A UnB - Setor Leste Gama DF Brasília 72444-240 Brazil

Disturbances in balance control lead to movement impairment and severe discomfort, dizziness, vertigo and may also lead to serious accidents. It is important to monitor the level of balance in order to determine the risk of a fall and to evaluate progress during treatment. Some solutions exist, but they are generally restricted to indoor environments. We propose and evaluate a system, based on accelerometers and support vector machines, that indicates the user's postural balance variation which can be used in indoor and outdoor environments. For the training phase of the system, we used the accelerometer signals acquired from a single subject under monitored conditions of balance and intentional imbalance, and used the scores provided by the SWAY®software for establishing the reference target values. Based on these targets, we trained a support vector machine to classify the signal into n levels of balance and later evaluated the performance using cross validation by random resampling. We also developed a support vector machine approach for estimating the center of pressure, by using as reference targets the results from a force platform. For validation, we performed experiments with a subject who was performing determined movements. Later other experiments were executed, so the different centers of pressure could be computed by our system and compared to the results from the force platform. We also performed tests with a dummy and a John Doe doll, in order to observe the system's behavior in the presence of a sudden drop or a lack of balance. The results show that the system can classify the acquired signals into two to seven levels of balance, with significant accuracy, and was also able to infer the centroid of each center of pressure region with an error lower than 0.9 cm. The tests performed with the dolls show that the system is able to distinguish between the conditions of a sudden drop and of a recovery of balance after losing one's balance. The results sugg

关键词： Accelerometers Balance signals processing Images processing Postural balance Support vector machines

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Extended Embedded Depth Using Cascaded Resonators Near-field WPT System with High Efficiency for Biomedical Implants

Extended Embedded Depth Using Cascaded Resonators Near-field...

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Microwave, MTT-S International Symposium

作者： Mohamed Aboualalaa Ramesh K. Pokharel Takana Kaho Graduate School of Information Science and Electrical Engineering Kyushu University Japan Microstrip Department Electronics Research Institute Egypt Shonan Institute of Technology Japan

A novel multiple cascaded resonators wireless power transfer (WPT) design is proposed to provide an extended implanted depth for biomedical implants. Symmetrical four cascaded resonators are utilized in Tx/Rx to obtain high power transfer efficiency (PTE); each resonator consists of two concentric rectangular loops. KQ-product is calculated for a single resonator and compared with the four resonators WPT; four cascaded resonators achieve higher KQ-product value and produce a maximum measured PTE of 89.5% at a transfer distance of 20 mm. Then, the proposed WPT is tested with human tissue to provide a measured PTE of 76% and 63% at a transfer distance of 15 and 20mm, respectively. Specific absorption rate (SAR) is calculated to estimate the maximum operating power of the source and receiver that guarantees working within the safety standard levels of RF exposure.

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A Zero Harmonic Distortion Grid-Connected Grid-Forming Converter for Battery Energy Storage System Applications

A Zero Harmonic Distortion Grid-Connected Grid-Forming Conve...

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

作者： Gabriel V. Ramos Thiago M. Parreiras Fangzhou Zhao Xiongfei Wang Braz de J. C. Filho Graduate Program in Electrical Engineering - Universidade Federal de Minas Gerais Belo Horizonte MG Brazil Department of Electrical Engineering Centro Federal de Educação Tecnológica de Minas Gerais Belo Horizonte Brazil Department of Energy Aalborg University Aalborg Denmark Division of Electric Power and Energy Systems KTH Royal Institute of Technology Stockholm Sweden Department of Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte Brazil

ISBN: (数字)9798331516116

ISBN: (纸本)9798331516123

The work proposes the Zero Harmonic Distortion Converter (ZHD) as a grid-connected grid-forming (GFM) converter due to its unique sinusoidal characteristic without capacitive filters, low parts count, and off-the-shelf power circuitry with a simple open-loop control structure that does not contribute to possible control interaction and resonances in grid-connected mode. These characteristic are reached by a harmonic cancellation in a three-winding transformer along with harmonic elimination using the Selective Harmonic Elimination Pulse Width Modulation (SHE PWM). The ZHD GFM converter is a compelling alternative for GFM battery energy storage systems (BESS) in medium-voltage applications.

关键词： Filters Battery energy storage system Medium voltage Pulse width modulation Harmonic analysis Harmonic distortion Voltage control Power harmonic filters Grid forming Voltage-source converters

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ICE: An Intelligent Cognition Engine with 3D NAND-Based In-Memory Computing for Vector Similarity Search Acceleration 22

ICE: An Intelligent Cognition Engine with 3D NAND-Based In-M...

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Proceedings of the 55th Annual IEEE/ACM International Symposium on Microarchitecture

作者： Han-Wen Hu Wei-Chen Wang Yuan-Hao Chang Yung-Chun Lee Bo-Rong Lin Huai-Mu Wang Yen-Po Lin Yu-Ming Huang Chong-Ying Lee Tzu-Hsiang Su Chih-Chang Hsieh Chia-Ming Hu Yi-Ting Lai Chung-Kuang Chen Han-Sung Chen Hsiang-Pang Li Tei-Wei Kuo Meng-Fan Chang Keh-Chung Wang Chun-Hsiung Hung Chih-Yuan Lu Macronix International Co. Ltd. and Department of Electrical Engineering National Tsing Hua University Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology and Macronix International Co. Ltd. Institute of Information Science Academia Sinica Macronix International Co. Ltd Macronix International Co. Ltd. and Graduate Institute of Electronics Engineering National Taiwan University Department of Computer Science and Information Engineering National Taiwan University and Graduate Institute of Electronics Engineering National Taiwan University Department of Electrical Engineering National Tsing Hua University

ISBN: (纸本)9781665462723

Vector similarity search (VSS) for unstructured vectors generated via machine learning methods is a promising solution for many applications, such as face search. With increasing awareness and concern about data security requirements, there is a compelling need to store data and process VSS applications locally on edge devices rather than send data to servers for computation. However, the explosive amount of data movement from NAND storage to DRAM across memory hierarchy and data processing of the entire dataset consume enormous energy and require long latency for VSS applications. Specifically, edge devices with insufficient DRAM capacity will trigger data swap and deteriorate the execution performance. To overcome this crucial hurdle, we propose an intelligent cognition engine (ICE) with cognitive 3D NAND, featuring non-volatile in-memory computing (nvIMC) to accelerate the processing, suppress the data movement, and reduce data swap between the processor and storage. This cognitive 3D NAND features digital nvIMC techniques (i.e., ADC/DAC-free approach), high-density 3D NAND, and compatibility with standard 3D NAND products with minor modifications. To facilitate parallel INT8/INT4 vector-vector multiplication (VVM) and mitigate the reliability issue of 3D NAND, we develop a bit-error-tolerance data encoding and a two's complement-based digital accumulator. VVM can support similarity computations (e.g., cosine similarity and Euclidean distance), which are required to search "the most similar data" right where they are stored. In addition, the proposed solution can be realized on edge storage products, e.g., embedded MultiMedia Card (eMMC). The measured and simulated results on real 3D NAND chips show that ICE enhances the system execution time by 17× to 95× and energy efficiency by 11× to 140×, compared to traditional von Neumann approaches using state-of-the-art edge systems with MobileFaceNet on CASIA-WebFace dataset. To the best of our knowledge, this work demo

关键词： 3D NAND in-memory computing vector similarity search unstructured data search

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Outcomes of pediatric community-acquired pneumonia before and after national pneumococcal immunization in Taiwan

引用

Pediatric Pulmonology 2023年第11期58卷 3246-3254页

作者： Chang, I-Fan Lin, I-Fan Liu, Yun-Chung Chou, Chia-Ching Chang, Tu-Hsuan Yen, Ting-Yu Lu, Chun-Yi Chang, Luan-Yin Lai, Feipei Huang, Li-Min Department of Pediatrics Taipei Hospital Ministry of Health and Welfare New Taipei City Taiwan Department of Pediatrics College of Medicine National Taiwan University Hospital National Taiwan University Taipei Taiwan Institute of Applied Mechanics National Taiwan University Taipei Taiwan Department of Pediatrics Chi-Mei Medical Center Tainan Taiwan Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taipei Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

Objective: In Taiwan, the incidence of invasive pneumococcal disease (IPD) in children declined after the catch-up primary vaccination programs and the full national immunization program (NIP) with PCV13. The objective of the study was to investigate the clinical outcomes of pediatric community-acquired pneumonia (CAP) before and after the NIP. Methods: The study included patients aged 3 months to 17 years who were diagnosed with CAP and treated at the National Taiwan University Hospital between 2007 and 2019. Patients were assigned to three birth cohorts according to their birth years and vaccination eligibility: non-NIP, catch-up, and full NIP. We compared the rates of severe outcomes, including case fatality and pathogens. Results: A total of 6557 patients who met the CAP criteria were enrolled during the study period. The case-fatality rate decreased from 3.2% (94/2984) in the non-NIP cohort to 0.3% (7/2176) in the catch-up cohort and 0.8% (11/1397) in the full NIP cohort (p < 0.001). Furthermore, there was a significant decrease in invasive ventilation from the non-NIP (17.9%) to both catch-up (6.8%) and full NIP cohorts (9.1%). The rate of IPD declined from the non-NIP cohort to the catch-up cohort (1.8% vs. 0.6%, p < 0.001) and from the catch-up to the full NIP cohort (0.6% vs. 0.07%, p = 0.014). In contrast, the rates of infections with other pathogens increased after NIP. Conclusion: The introduction of PCV13 showed significant reduction in case-fatality and IPD rates. The increasing rates of other pathogens warrant further surveillance for their clinical significance. © 2023 Wiley Periodicals LLC.

关键词： immunization outcome pneumonia Streptococcus pneumonia

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Performance Improvement of Maximum Likelihood Wave Source Localization with LOS/NLOS Identification

Performance Improvement of Maximum Likelihood Wave Source Lo...

引用

IEEE International Conference on Consumer electronics-Taiwan (ICCE-TW)

作者： Takayuki Mori Shinichi Murata Takahiro Matsuda Takefumi Hiraguri Graduate School of Systems Design Tokyo Metropolitan University Tokyo Japan Department of Electrical Electronics and Communication Engineering Nippon Institute of Technology Saitama Japan

Wave source or emitter localization aims at estimating positions of unknown transmitters of radio signals. A maximum likelihood wave source localization scheme (MLE scheme) using unmanned aerial vehicles (UAVs) is proposed in non-line-of-sight (NLOS) environments. We propose a new wave source localization scheme by extending the MLE scheme. The proposed scheme first obtains a tentative wave source location using the MLE scheme, and then identifies whether each path between the tentative location and a measurement point is in LOS or NLOS. Finally, the tentative location is corrected by the LOS/NLOS identification. We evaluate the performance of the proposed scheme using simulation experiments and show that the average estimation error of the proposed scheme is improved by more than 30% compared to the MLE scheme.

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Electronic-photonic quantum systems on-chip

Electronic-photonic quantum systems on-chip

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Quantum 2.0, QUANTUM 2022

作者： Wang, Imbert Ramesh, Anirudh Kramnik, Danielius Fargas Cabanillas, Josep M. Stojanović, Vladimir Kumar, Prem Popović, Miloš A. Department of Electrical and Computer Engineering Photonics Center Boston University BostonMA02215 United States Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Department of Electrical Engineering and Computer Science UC Berkeley BerkeleyCA94720 United States Center for Photonic Communication and Computing Dept. of Electrical and Computer Eng. Northwestern University EvanstonIL60208 United States

We present progress towards realizing electronic-photonic quantum systems on-chip;particularly, entangled photon-pair sources, placing them in the context of previous work, and outlining our vision for mass-producible... 详细信息

ISBN: (纸本)9781957171111

关键词： Quantum entanglement

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Extending Cislunar Communication Network Reach Using Reconfigurable Intelligent Surfaces

arXiv

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arXiv 2024年

作者： Huroon, Aamer Mohamed Donmez, Baris Huang, Yu-Chih Kurt, Gunes Karabulut Wang, Li-Chun EECS International Graduate Program National Yang Ming Chiao Tung University Taiwan Institute of Communications Engineering National Yang Ming Chiao Tung University Taiwan Department of Electrical and Computer Engineering National Yang Ming Chiao Tung University Taiwan Dept. of Electrical Engineering Polytechnique Montréal Montréal Canada

This study introduces a novel approach to enhance communication networks in the cislunar space by leveraging Reconfigurable Intelligent Surfaces (RIS). Using the ability of RIS to dynamically control electromagnetic waves, this paper tackles the challenges of signal attenuation, directivity, and divergence in cislunar missions, primarily caused by immense distances and that Earth-based station transmitters do not always face the Moon. A new optimization problem is formulated, whose objective is to maximize the received signal-to-noise ratio (SNR) for Earth-to-Moon communications. We derive a closed-form solution to the problem of determining the optimal RIS phase shift configuration based on the effective area of the RIS. Through extensive simulations, this paper demonstrates how optimal adjustments in RIS phase shifts can significantly enhance signal integrity, hinting at the substantial potential of RIS technology to revolutionize long-distance cislunar communication. Copyright © 2024, The Authors. All rights reserved.

关键词： Moon

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