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IEEE Journal on Flexible Electronics 2024年第5期3卷 172-172页

作者： Ng, Tse Nga Mantysalo, Matti Agarwala, Shweta Tee, Benjamin Kim, Woo Soo Grau, Gerd University of California at San Diego Department of Electrical and Computer Engineering La Jolla CA92093 United States Tampere University Department of Electrical Engineering Tampere Finland Aarhus University Department of Electrical and Computer Engineering Aarhus Denmark National University of Singapore Department of Materials Science and Engineering Lower Kent Ridge Road 119077 Singapore Simon Fraser University Department of Mechatronic Systems Engineering BurnabyBCV5A 1S6 Canada York University Department of Electrical Engineering and Computer Science TorontoONM3J 1P3 Canada

This Special Issue of the IEEE Journal on Flexible Electronics (J-FLEX) showcases the expanded papers presented at the 2023 IEEE International Conference on Flexible Printable Sensors and Systems (FLEPS), held in Boston, MA, USA. FLEPS was organized by the IEEE Sensors Council. The advancements in flexibility and printability are reshaping the landscape of electronic device design and production, sparking great enthusiasm globally for the field of flexible and printable electronics. FLEPS served as an excellent platform for engaging in discussions about the latest advancements in the field and shaping future pathways for sensors utilizing unconventional materials and manufacturing technologies. FLEPS garnered an enthusiastic response, attracting leading experts, researchers, and innovators from both academia and industry. The technical program of FLEPS 2023 comprised over 150 presentations spanning three days. Submitted papers underwent a rigorous peer-review process. The authors whose papers were accepted were encouraged to submit extended versions for consideration, hence the creation of this special issue. © 2022 IEEE.

关键词： Paper

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Improving electrically Evoked Compound Action Potential Based on electrical Field Imaging and Electrode Interfaces

Improving Electrically Evoked Compound Action Potential Base...

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IEEE Conference on Electromagnetic Field Computation

作者： Charles T.M. Choi Chun Ting Ke Jelani Lawrence Alexander C. C. Wang Department of Electronics and Electrical Engineering College of Electrical & Computer Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Institute of Electrical and Control Engineering College of Electrical & Computer Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Institute of Biomedical Engineering College of Electrical & Computer Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Electrical Engineering & Computer Science International Graduate Program College of Electrical & Computer Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan

ISBN: (数字)9798350348958

ISBN: (纸本)9798350348965

The electrically evoked compound action potential (ECAP) has been used in various clinical studies and has become a key physiological signal for cochlear implants (CI). This study used four sensing electrodes to record ECAP signals based on the alternating polarity approach. An electrical field imaging (EFI) result based on the finite element method was used to obtain the interface impedance, then ECAP simulation results were computed and compared with a patient's clinical ECAP measurements. Preliminary modeling results show that the interface impedance obtained by this EFI-based technique can improve the simulation accuracy of the ECAP model. The ECAP modeling result will be compared with clinical ECAP measurements to validate the model in the full paper.

关键词： Electrodes Action potentials Impedance measurement Computational modeling Simulation Imaging Finite element analysis

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Machine Learning Enabled Image Classification for Automated Data Acquisition in the Electron Microscope

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1909-1910页

作者： Wahl, Carolin B. Day, Alexandra Gupta, Vishu Dos Reis, Roberto R. Liao, Wei-Keng Mirkin, Chad A. Choudhary, Alok Dravid, Vinayak P. Agrawal, Ankit Department of Materials Science and Engineering Northwestern University Evanston IL United States International Institute for Nanotechnology Northwestern University Evanston IL United States Department of Electrical and Computer Engineering Northwestern University IL United States NUANCE Center Northwestern University Evanston IL United States Department of Chemistry Northwestern University Evanston IL United States

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Surface Oxidisation Layer Identification of Indium Nitride Nanoparticles via s-SNOM

Surface Oxidisation Layer Identification of Indium Nitride N...

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International Conference on Infrared and Millimeter Waves

作者： X. Liu R. Prinja T. Vincent B. Gholizadeh D. Johnson N. P. Kherani J. L. Boland Department of Electrical and Electronic Engineering Photon Science Institute University of Manchester Manchester United Kingdom Department of Electrical & Computer Engineering University of Toronto Toronto Canada Department of Materials Science & Engineering University of Toronto Toronto Canada

InN materials have been widely used in optoelectronic devices, namely red LEDs. However, the surface oxidization introduced during growth and by air exposure can change their bandgap and mobility drastically, affecting device performance. In this study, we employed a surface-sensitive technique, scattering-type scanning near-field optical microscopy (s-SNOM) to investigate the oxidization level of InN nanoparticles and demonstrate how tapping amplitude and demodulation order affect the near-field response.

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Writable and Erasable Second Harmonic Generation from Crystal-Derived All-Glass Optical Fibers

Writable and Erasable Second Harmonic Generation from Crysta...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Pietros, Alexander R. Rebeszko, Kacper Hawkins, Thomas Cavillon, Maxime Ballato, John Dragic, Peter D. Laboratory The Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign 208 N Wright St UrbanaIL61801 United States The Department of Materials Science and Engineering Clemson University 91 Technology Drive AndersonSC29625 United States Université Pans-Saclay CNRS Orsay91400 France

All glass optical fibers drawn from crystalline precursors via the molten core method demonstrate instantaneous and greatly enhanced second harmonic generation. Results when pumping in the NIR at relatively low powers... 详细信息

ISBN: (纸本)9781957171258

关键词： Harmonic generation

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Modeling Atomistically Assembled Diffractive Optics in Solids

arXiv

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arXiv 2024年

作者： Kling, Trevor Na, Dong-Yeop Hosseini, Mahdi Department of Electrical and Computer Engineering Applied Physics Program Northwestern University EvanstonIL60208 United States Department of Electrical Engineering Pohang University of Science and Technology Pohang37673 Korea Republic of Elmore Family School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States

We develop a model describing long-range atom-atom interactions in a two-dimensional periodic or a-periodic lattice of optical centers inside a solid-state host material. We consider realistic environmental and technical conditions such as frequency and position broadening. Even when considering a significant frequency broadening in the ensemble (∼300 GHz), we observe up to a three-fold increase in directional scattering from the resonant lattice in a system. The model can be used to scalably design quantum optical elements, e.g. a quantum lens, harnessing atomistic engineering (e.g. via ion implantation) of collective interactions in materials to enhance quantum properties. © 2024, CC BY.

关键词： Nanocrystals

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Stretchable Textile Bands for Ambulatory Electrocardiogram and Oximetry

IEEE Journal on Flexible Electronics

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IEEE Journal on Flexible Electronics 2022年第4期1卷 214-222页

作者： Liu, Jiaxi Le, Thy Sadatian, Ellie Yao, Lulu Garudadri, Harinath Dunphy, Stephen A. McClung, Christian Ng, Tse Nga University of California at San Diego Department of Electrical and Computer Engineering La Jolla CA92093 United States University of California at San Diego Materials Science and Engineering Program La Jolla CA92093 United States Qualcomm Institute University of California at San Diego La Jolla CA92093 United States Cb Innovations Llc Rancho Santa FeCA92067 United States

This work presents a vital sign monitoring interface combining electrocardiogram (ECG) and reflective photoplethysmography (PPG) acquisition on stretchable kinesiology tapes (KTs). The integrated textile bands are less prone to electrode misplacement and deliver high-quality diagnostic ECG signals with dry electrodes. The reflective PPG measured over the subclavian artery is used to track blood oxygen saturation, and in combination with ECG, enables the determination of pulse transit time and inference of blood pressure. This multimodal interface improves clinical workflows because it is easy to don, reduces motion artifacts, and facilitates more efficient and accurate diagnosis in emergency settings. © 2022 IEEE.

关键词： Electrocardiograms

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Improving PEM Hydrogen Electrolyser Efficiency using AC Excitation

Improving PEM Hydrogen Electrolyser Efficiency using AC Exci...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Thea Larsen Seho Kim John Kennedy Jingjing Liu Department of Electrical Computer and Software Engineering University of Auckland Auckland New Zealand Earth Resources and Materials Geological and Nuclear Science Wellington New Zealand Department of Chemical and Materials Engineering The University of Auckland Auckland New Zealand

ISBN: (数字)9798350376067

ISBN: (纸本)9798350376074

Hydrogen is a potential clean energy source that minimises environmental impacts but is currently economically prohibitive due to the low energy conversion efficiency. In order to improve the economic viability, this paper investigates improving the efficiency of hydrogen electrolysis. The prototype power electronics presented in this paper provide low-frequency AC or pulsed current to a proton exchange membrane (PEM) electrolyser to improve the operational efficiency up to 4.2% in contrast to the typical constant current or voltage excitation.

关键词： Green energy Protons Electric potential Buck converters Power supplies Hydrogen Prototypes Voltage Energy conversion Electrochemical processes

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Ontology-Driven IoT System for Monitoring Hypertension 25

Ontology-Driven IoT System for Monitoring Hypertension

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25th International Conference on Enterprise Information Systems, ICEIS 2023

作者： de Souza, Pedro Lopes de Souza, Wanderley Lopes Pires, Luís Ferreira Moreira, João Luiz Rebelo da Silva Rodrigues, Ronitti Juner Ciferri, Ricardo Rodrigues Semantics Cybersecurity & Services Group Faculty of Electrical Engineering Mathematics and Computer Science University of Twente P.O. Box 217 Enschede Netherlands Ubiquitous Computing Group Graduate Program in Computer Science Computing Department Federal University of São Carlos P.O. Box 676 São Carlos Brazil

ISBN: (纸本)9789897586484

Hypertension is a noncommunicable disease (NCD) that causes global concern, high costs and a high number of deaths. Internet of Things, Ubiquitous Computing, and Cloud Computing enable the development of systems for remote and real-time monitoring of patients affected with NCDs like hypertension. This paper reports on a system for monitoring hypertension patients that was built by employing these techniques. This system allows the vital signs of a patient (blood pressure, heart rate, body temperature) to be captured via sensors built in a wearable device similar to a wristwatch. These signals are transmitted to the patient's mobile device for processing, and the generated clinical data are sent to the cloud to be properly presented and analysed by the health professionals responsible for the patient. To deal with semantic interoperability issues that arise when multiple different devices and system components must interoperate, a semantic model was conceived for this system in terms of ontologies for diseases and devices. This paper also presents the semantic module that we developed and implemented in the cloud to perform reasoning based on this model, demonstrating the potential benefits of incorporating semantic technologies in our system. Copyright © 2023 by SCITEPRESS - science and Technology Publications, Lda. Under CC license (CC BY-NC-ND 4.0)

关键词： Ontology

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Observation of double hysteresis in CoFe2O4/MnFe2O4 core/shell nanoparticles and its contribution to AC heat induction

arXiv

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arXiv 2025年

作者： Wang, Jie Kim, Hyungsub Kim, Ji-Wook Seo, HyeongJoo Ota, Satoshi You, Chun-Yeol Takemura, Yasushi Bae, Seongtae Department of Electrical Engineering University of South Carolina ColumbiaSC29208 United States Department of Emerging Materials Science Daegu Gyeongbuk Institute of Science & Technology Daegu42988 Korea Republic of Department of Electrical and Electronic Engineering Shizuoka University Hamamatsu432-8561 Japan Department of Electrical and Computer Engineering Yokohama National University Yokohama240-8501 Japan

Magnetic core/shell nanoparticles are promising candidates for magnetic hyperthermia due to its high AC magnetic heat induction (specific loss power (SLP)). It’s widely accepted that magnetic exchange-coupling between core and shell plays the crucial role in enhancing SLP of magnetic core/shell nanoparticles. However, the physical contribution of exchange coupling to SLP has not been systematically investigated, and the underlying mechanism remains unclear. In this study, magnetic hard/soft CoFe2O4/MnFe2O4 and inverted soft/hard MnFe2O4/CoFe2O4 core/shell nanoparticles were synthesized, systematically varying the number of shell layers, to investigate the physical contribution of internal bias coupling at the core/shell interface to AC heat induction (SLP). Our results show that a unique magnetic property, double-hysteresis loop, was present and clearly observed, which was never reported in previous core/shell research literature. According to the experimentally and theoretically analyzed results, the double-hysteresis behavior in core/shell nanoparticles was caused by the difference of magnetic anisotropy between core and shell materials, separated by a non-magnetic interface. The enhanced SLP and and maximum temperature rise (TAC,max) of core/shell nanoparticles are attributed to the optimized magnetic anositropy, AC magnetic softness and double hysteresis behavior due to the internal bias coupling. These results demonstrate that the rational design capabilities to separately control the magnetic anisotropy, AC/DC magnetic properties by varying the volume ration between core and shell and by switching hard or soft phase materials between core and shell are effective modalities to enhance the AC heat induction of core/shell nanoparticles for magnetic nanoparticle hyperthermia. Copyright © 2025, The Authors. All rights reserved.

关键词： Magnetic anisotropy

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