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16th IEEE Latin American Symposium on Circuits and Systems, LASCAS 2025

作者： Johnson, Emmanuel K. M. Lima, Luis Victor N. Campagnucci, Pamela. R. A. N. Haddad, Sandro A. P. Amaral, Wellington A. Munoz, Daniel M. University of Brasilia Mechatronics Graduate Program Department of Mechanical Engineering DF Brasilia Brazil University of Brasilia Faculty of Gama Electronics Engineering Undergraduate Program DF Brasilia Brazil

ISBN: (纸本)9798331522124

This paper presents a comparison between two LDOs (Low Dropout Regulators) developed for a PMIC (Power Management Integrated Circuit) responsible for powering a 32-bit microcontroller based on the RISC-V microarchitecture, designed in 22 nm technology. The microcontroller will be integrated with a radio frequency interface for IoT (Internet of Things) applications. Two LDOs were designed: one with external compensation and the other a capacitor-less LDO. Both operate with an input voltage of 2.5V, an output voltage of 0.8V, and a maximum current of 150mA. The externally compensated LDO exhibited greater stability in response to load variations and a higher PSRR (Power Supply Rejection Ratio), while the capacitor-less LDO demonstrated faster regulation speed and occupied a chip area similar to the externally compensated LDO. © 2025 IEEE.

关键词： Low power electronics

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Automated Pricing-based Provisioning of SDN/NFV Services in Distributed Multi-access Edge Computing using Cooperative Multi-Agent Deep Reinforcement Learning 10

Automated Pricing-based Provisioning of SDN/NFV Services in ...

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10th International Conference on Dependable Systems and Their Applications, DSA 2023

作者： Julien, Jean Jimmy Nuannimnoi, Sirapop Huang, Ching-Yao National Yang-Ming Chiao Tung University Eecs International Graduate Program Hsinchu Taiwan National Yang-Ming Chiao Tung University Electronics Engineering Hsinchu Taiwan

ISBN: (纸本)9798350304770

The disruption caused by Software Defined Network and Network Function Virtualization (SDN/NFV) technologies will have many impacts on the telecom network. Specifically, the network architecture based on ETSI MANO comprising Virtual Infrastructure Manager (VIM), Virtual Network Function Manager (VNFM), and NFV Orchestrator (NFVO) will significantly change how we operate and manage the telecom network. These impacts on the network architecture will be made gradually. Thus, the migration from non-virtualized networks to all virtualized networks will happen step by step. By introducing new actors into the telecom ecosystem, NFV-MANO will bring in new business models. It is envisaged that these new actors/models will promote competition hence the demand for more flexible charging models with real-time charging. In this research, we will address the architectural realization of the SDN/NFV charging model under the business model of MANO (MANagement and Orchestration) when the service provider (SP) uses the Network Function Virtualization Infrastructure (NFVI) from the NFVIaaS Provider in a distributed multi-access edge computing (MEC) environment. To optimize the Quality of Service (QoS) of MEC resource allocation for incoming services and maximize the overall operating profit of the service provider adopting our charging model, we also propose a new cooperative multi-agent actor-critic based deep reinforcement learning (MADRL) method trained with proximal policy optimization algorithm, namely Coop MAPPO. The results of our experiments showcase the superiority of the Coop-MAPPO multi-agent system over alternative decision-making approaches, with its potential for enhancing operational efficiency and profitability while minimizing failure rates. © 2023 IEEE.

关键词： Reinforcement learning

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EXPERIMENTAL AND NUMERICAL DYNAMIC EVALUATION OF PROFILED STEEL DECKING SLAB IN A CONTAINER HOUSE USING MEMS 9

EXPERIMENTAL AND NUMERICAL DYNAMIC EVALUATION OF PROFILED ST...

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9th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake engineering, COMPDYN 2023

作者： Lima, Henrique Tavares de Medeiros Alas, Luis Ernesto de Almeida Nunes, Mateus Narcizo da Silva Medeiros, Iálysson de Lima, Douglas Mateus Graduate Program of Civil and Environmental Engineering Academic Center of Agreste Federal University of Pernambuco Avenida Marielle Franco Bairro Nova Caruaru PE Caruaru55014-900 Brazil

The reuse of shipping containers is common in civil construction, not only for ecological reasons but also for speeding up the construction time, thus favoring the decrease in the payback time of the applied financial investment. Consequently, technological developments guarantee this trend with lighter structural elements, thus occurring natural frequencies closer to the frequency ranges of dynamic excitations associated with human activities. Therefore, a direct consequence of this new design trend is a considerable increase in problems related to unwanted vibrations in steel and concrete composite slabs, which arise from rhythmic actions, and external vibrations arising from earthquakes, which must be analysed to meet the comfort and safety of residents. Thus, this study aims to present a vibration analysis in a composite floor slab, built in steel deck 59S, of a residence built with reuse maritime containers in the municipality of Gravatá in Pernambuco, Brazil. The structure consists of three floors, with the cantilever slab analysed with dimensions of 8.24 m wide and 4.00 m long. In the experimental phase, vibration analysis was carried out through the heel impact test to obtain the natural frequencies, which had average values of 7.0 Hz, and average values of 7.14% for the damping ratio of the slab, a MicroElectroMechanical System (MEMS) was used, which are accelerometers of signals present in smartphone devices. Subsequently, using the software SCIA Engineer, the numerical analysis of the model was carried out, where usual discretization techniques were used through the Finite Element Method (FEM) to evaluate the structural behavior against dynamic actions, thus obtaining the results of natural frequencies, average values of 6.46 Hz, and modal shapes. With this, it was possible to verify the results regarding the natural frequencies of vibration, analysing the usability, comfort, and health of the structure according to the current normative codes. Finally, t

关键词： Natural frequencies

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Revisiting Anderson-Higgs mechanism: Application of Lieb-Schultz-Mattis theorem

Revisiting Anderson-Higgs mechanism: Application of Lieb-Sch...

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2020 International Conference on Strongly Correlated Electron Systems, SCES 2020

作者： Tada, Yasuhiro Quantum Matter Program Graduate School of Advanced Science and Engineering Hiroshima University Higashihiroshima Hiroshima739-8530 Japan

We consider an electron model of superconductivity on a three-dimensional lattice where there are on-site attractive Hubbard interaction and long-range repulsive Coulomb interaction. It is claimed that fully gapped s-wave superconductivity within this model, if present, exhibits spontaneous translation symmetry breaking possibly related to a charge order. Our discussions are based on an application of the Lieb-Schultz-Mattis theorem under some physical assumptions. The inconsistency between the proposed supersolid and experiments can impose some constraints on a reasonable choice of a theoretical model. © Published under licence by IOP Publishing Ltd.

关键词： Shear waves

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The potential of plant proteins as antifungal agents for agricultural applications

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Synthetic and Systems Biotechnology 2022年第4期7卷 1075-1083页

作者： Tiffany Chiu Theo Poucet Yanran Li Graduate Program in Genetics GenomicsAnd Bioinformatics1140 Batchelor HallUniversity of California RiversideCalifornia92521USA Department of Chemical and Environmental Engineering University of CaliforniaRiversideCA92521USA

Fungal pathogens induce a variety of diseases in both plants and post-harvest food crops,resulting in significant crop losses for the agricultural *** the usage of chemical-based fungicides is the most common way to control these diseases,they damage the environment,have the potential to harm human and animal life,and may lead to resistant fungal ***,there is an urgent need for diverse and effective agricultural fungicides that are environmentally-and *** have evolved various mechanisms in their innate immune system to defend against fungal pathogens,including soluble proteins secreted from plants with antifungal *** proteins can inhibit fungal growth and infection through a variety of mechanisms while exhibiting diverse functionality in addition to antifungal *** this mini review,we summarize and discuss the potential of using plant antifungal proteins for future agricultural applications from the perspective of bioengineering and biotechnology.

关键词： antifungal potential crops

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Learning from failure - Development of a Culture of Failure Scale for Higher Education

Learning from failure - Development of a Culture of Failure ...

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2022 IEEE IFEES World engineering Education Forum - Global engineering Deans Council, WEEF-GEDC 2022

作者： Malschutzky, Michael M. Gurganus, Jamie R. Department of Management Sciences Germany Mechanical Engineering and Graduate School University of Maryland Baltimore County Engineering and Computing Education Program Baltimore United States

ISBN: (纸本)9781665475280

Benefits of a failure friendly culture, e.g., learning from failure, are widely known in occupational settings. Validated scales have been developed to measure organizational failure culture and individuals' mind-sets on failure. While research on learning from failure exists in secondary education, scales for higher education are lacking. To support both higher education engineering instructors and students, this contribution aims to develop a Culture of Failure Scale to assess students' and lecturers' handling of failures in engineering higher education settings. This data-driven approach helps inform instructors about aspects of educational settings that are safe and conducive to learning and supports their students to develop a mind-set where failures are seen as a source for improvements and learning. Exemplary application of the developed scale is shown by assessing the failure culture in different groupings, e.g., gender, between two participating German and US institutions. © 2022 IEEE.

关键词： Failure (mechanical)

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Development of LED Lighting for Microalgae Propagation with Emission Spectrum Having Broader Emission Peaks

Development of LED Lighting for Microalgae Propagation with ...

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2024 IEEE Sustainable Smart Lighting World Conference and Expo, LS24 2024

作者： Hosoda, Nobuaki Murata, Takashi Misu, Takayuki Kanagawa Institute of Technology Graduate School of Engineering Master's Degree Program in Electrical and Electronic Engineering Atsugi Kanagawa243-0292 Japan Kanagawa Institute of Technology Faculty of Engineering Department of Applied Chemistry and Bioscience Atsugi Kanagawa243-0292 Japan Kanagawa Institute of Technology Faculty of Engineering Department of Electrical and Electronic Engineering Atsugi Kanagawa243-0292 Japan

ISBN: (纸本)9798331540197

In this study, we aimed to develop LED lighting with an emission spectrum effective for microalgae propagation, and fabricated LED lighting with Phosphor layer RGB, which has peaks in the red, green, and blue wavelength bands, and Phosphor layer RG'B', which has broader peaks in the red, green, and blue wavelength bands. In order to examine the effect of microalgae propagation, Closterium ehrenbergii samples prepared at different dilution rates were irradiated with LED illumination light of Phosphor layer RG'B' and Phosphor layer RGB, respectively, for 7 days, and their propagation rates were compared. The results of the experiment showed that Phosphor layer RG'B' produced a higher propagation rate than Phosphor layer RGB. © 2024 IEEE.

关键词： Light emitting diodes

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News-Driven Price Movement Forecasting with Label-Prior Graph Attention 24

News-Driven Price Movement Forecasting with Label-Prior Grap...

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33rd Companion of the ACM World Wide Web Conference, WWW 2023

作者： Liou, Yi-Ting Chen, Chung-Chi Huang, Hen-Hsen Chen, Hsin-Hsi Graduate Program of Data Science National Taiwan University Academia Sinica Taiwan AIST Japan Institute of Information Science Academia Sinica Taiwan Department of Computer Science and Information Engineering National Taiwan University Taiwan

ISBN: (纸本)9798400701726

This paper introduces a novel approach to stock movement prediction using multi-label classification, leveraging the interconnections between news articles and related company stocks. We present the Label-Prior Graph Attention (LPGA) model, which significantly enhances the performance of news-driven stock price movement forecasting. This model is comprised of a unique graph attention architecture, incorporating a label encoder and a text encoder, designed to effectively capture and utilize the relationships between labels in a graph-based context. Our model demonstrates superior performance over several benchmark models. The LPGA model’s efficacy is further validated through experiments on two multilabel datasets. The model outperforms established baseline models across various evaluation metrics. The success of the LPGA model in both stock movement prediction and general multi-label classification tasks indicates its potential as a versatile tool in the realm of machine learning and financial analysis. © 2024 Copyright held by the owner/author(s). Publication rights licensed to ACM.

关键词： Graphic methods

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Effect of Cu addition on electrochemical activity of ribbons of Mg-Al-Ca anode materials for magnesium rechargeable batteries manufactured by rapid solidification method

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Keikinzoku/Journal of Japan Institute of Light Metals 2024年第1期74卷 14-17页

作者： Fukui, Shunsaku Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama Japan CHUETSU METAL WORKS CO. LTD. Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Kawaguchi Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

The potential for magnesium storage batteries to become the next generation of rechargeable batteries is high. This is largely due to the abundance of magnesium metal resources and their high safety and electric capacity per volume. Our research team has been studying magnesium alloys as anode materials for these batteries. Specifically, we have been investigating the electrochemical activity and mechanism of adding copper to Mg-9mass%Al and Mg-9mass%Al-3mass%Ca. Our findings indicate that the electrochemical activity increased with the addition of 1mass%Cu, but decreased with the addition of 3mass%Cu. In addition, changes in lattice constant and basal orientation were also observed. These changes decreased with 1mass%Cu and increased with 3mass%Cu. SEM observations showed that the cell delimitation was indistinct for the 1%Cu addition. © 2024 The Japan Institute of Light Metals.

关键词： Secondary batteries

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Fiber Optic Sensor Improves Displacement Measurement in Dielectric Elastomers Actuators

Fiber Optic Sensor Improves Displacement Measurement in Diel...

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IEEE/ASME International Conference on Mechtronic and Embedded Systems and Applications, MESA

作者： Alexandre Bernardo Santos Da Silva Gabriel Escher Pires Mendes Arnaldo Gomes Leal Claysson B. S. Vimieiro Camilo Arturo Rodríguez Díaz Rafhael Milanezi de Andrade Graduate Program of Mechanical Engineering Universidade Federal do Espírito Santo Vitória Brazil Department of Mechanical Engineering Universidade Federal do Espírito Santo Vitória Brazil Graduate Program of Mechanical Engineering Universidade Federal de Minas Gerais Belo Horizonte Brazil Graduate Program of Electrical Engineering Universidade Federal do Espírito Santo Vitória Brazil Graduate Program of Mechanical Engineering Universidade Federal do Espírito Santo Vitória ES Brazil

ISBN: (数字)9798331516239

ISBN: (纸本)9798331516246

Currently, developments in mechatronics have enabled the creation of compliant actuators and synthetic muscles, surpassing the constraints of inflexible actuators in assistive robotics systems. Dielectric elastomer actuators (DEAs) are comprised of an elastomer layer situated amidst two flexible electrodes, able to change dimensions under the influence of an electric voltage. While DEAs can function as autonomous sensors due to their viscoelastic behavior, accurately measuring actuator displacement continues to be an unresolved challenge. In this study, we introduce the development and assessment of a fiber-constrained dielectric elastomer actuator (FCDEA) with embedded optical fiber sensors for displacement measurement through optical potential difference. The DEAs were fabricated with VHB 4910, conductive carbon grease, and PETG as constrain fiber to restrict its displacement to the vertical direction. Silica optical fiber was integrated in the PETG strips and clamps to measure the actuator deformation upon activation. Different fabrication parameters of DEAs were investigated to obtain greater strain rates. DEAs with 90 mm x 90 mm, stretch (λ) = 3.6, and load (τ) = 120 kPa, and 90 mm x 110 mm, λ=3.6, and τ=120 kPa, presented the highest deformation capacity, with 90% and 80%, respectively. Moreover, results showed great linearity between the DEA deformation and optical potential, indicating the proposed configuration is suitable for displacement measurement.

关键词： Optical fibers Temperature measurement Optical fiber sensors Mechatronics Deformation Optical device fabrication Linearity Displacement measurement Optical variables measurement Muscles

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