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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Wu, Pei-Jhe Chao, Chi-Chao Liao, Yi-Hua Lin, Wen-Ying Hsieh, Sung-Tsang Sun, Wei-Zen Sun, Chi-Kuang Department of Electrical Engineering Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei Taiwan Department of Neurology National Taiwan University Hospital National Taiwan University College of Medicine Taipei Taiwan Department of Dermatology National Taiwan University Hospital National Taiwan University College of Medicine Taipei Taiwan Department of Life Science National Taiwan University Taipei Taiwan Department of Anesthesiology National Taiwan University Hospital National Taiwan University College of Medicine Taipei Taiwan Graduate Institute of Biomedical Electronics and Bioinformatics and Molecular Imaging Center National Taiwan University Taipei Taiwan

Here we introduce discontinuity third-harmonic-generation microscopy, a noninvasive clinical imaging methodology offering three-dimensional visualization of free intraepidermal nerve endings. It provides a label-free imaging solution for diagnosing small fiber neuropathy at the point of care. © Optica Publishing Group 2024

关键词： Harmonic generation

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In Vivo Discontinuity Third-Harmonic-Generation Microscopy for Label-Free Imaging of Human Intraepidermal Nerve Fibers

In Vivo Discontinuity Third-Harmonic-Generation Microscopy f...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Electro-optical waveguides Fiber lasers In vivo Lasers and electrooptics Microscopy Nerve endings Nerve fibers Point of care Visualization

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Negative thermal expansion coefficient of Al pnictides –A systematic realistic pressure-dependent lattice dynamical study

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Materials Science and engineering: B 2024年 302卷

作者： Talwar, Devki N. Lin, Hao-Hsiung Department of Physics University of North Florida 1 UNF Drive JacksonvilleFL32224-7699 United States Department of Physics Indiana University of Pennsylvania 975 Oakland Avenue 56 Weyandt Hall IndianaPA15705-1087 United States Graduate Institute of Electronics Engineering and Department of Electrical Engineering National Taiwan University Taipei10617 Taiwan

In weakly and strongly bonded semiconductors, the knowledge of accurate linear thermal expansion coefficients αT and Grüneisen constants γT play crucial roles for attaining the basic understanding of lattice anharmonicity and appraising their use as thermal management materials in designing different electronic devices. By adopting a realistic rigid-ion-model (RIM), we have reported the results of a comprehensive study on the phonon dispersions ωjq→ and thermodynamical properties of weakly bonded III-V AlX (X = P, As, and Sb) pnictides at ambient (P = 0 GPa) and high pressure (P = 8 GPa). The results are compared/contrasted with the strongly bonded III-Ns (AlN, GaN, and InN) and other materials. Specifically, we have linked the simulated negative thermal expansion (NTE) coefficient in AlX to the weakness of bond-bending forces which caused large softening in [Formula presented] for γT and αT to attain more negative values at low T. In III-Ns, however, there is only a weak sign of the TA phonon softening which results in no negative values of γT and αT. Unlike earlier first-principles studies in AlX indicating small NTE, our comprehensive RIM simulations have exhibited large negative values of αT and γT for AlP, AlAs and AlSb. In both weakly and strongly bonded solids the room temperature results of specific heat CvT, Debye temperature θDT, thermal expansion coefficient α (T), and Grüneisen constant γT provided very good agreement with the experimental and recent first-principles response function calculations. We strongly feel that this understanding of basic traits in different tetrahedral materials will be beneficial for specific device applications. © 2023 Elsevier B.V.

关键词： III-V semiconductors

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A Study on Giant Magnetostrictive Actuator for Interior Sound Control System of the Ultra-Compact Mobility: Fundamental Consideration on Formation of the Giant Magnetostrictive Phases Depending on Heat Treatment Condition 27

A Study on Giant Magnetostrictive Actuator for Interior Soun...

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27th International Conference on electrical Machines and Systems, ICEMS 2024

作者： Kato, Taro Naganuma, Ryusei Bando, Koki Sawada, Kentaro Wenbao, Wu Kobayashi, Ikkei Kuroda, Jumpei Uchino, Daigo Ogawa, Kazuki Ikeda, Keigo Endo, Ayato Kato, Hideaki Narita, Takayoshi Furui, Mitusaki Tokyo University of Technology Department of Mechanical Engineering 1404-1 Katakura Hachioji-shi Tokyo192-0982 Japan Sustainable Engineering Program Graduate School of Engineering Tokyo University of Technology 1404-1 Katakura Hachioji-shi Tokyo192-0982 Japan Tokai University Kitakaname 4-1-1 Kanagawa Hiratsuka-shi259-1292 Japan Tokai University Kitakaname 4-1-1 Kanagawa Hiratsuka-shi259-1292 Japan Numazu College Department of Mechanical Engineering Ohoka 3600 Shizuoka Numazu-shi410-0022 Japan Aichi University of Technology Department of Electronic Robotics 50-2 Manori Nishisako-machi Aichi Gamagori-shi443-0047 Japan Hokkaido University of Science Department of Mechanical Engineering 7-Jo 15-4-1 Maeda Teine Hokkaido Sapporo006-8585 Japan Fukuoka Institute of Technology Department of Electrical Engineering Wajiro Higashi 3-30-1 Higashi-ku Fukuoka Fukuoka-shi811-0295 Japan Tokai University Department of Mechanical System Engineering Kitakaname 4-1-1 Kanagawa Hiratsuka-shi259-1292 Japan

ISBN: (纸本)9784886864406

An active noise control system using giant magnetostrictive actuator has been proposed as a countermeasure for interior noise of the ultra-compact mobilities, which is a new transportation tools. In this paper, as basic research toward the development of the proposed giant magnetostrictive actuator for active noise control, we conduct experiments on the material properties when terbium, dysprosium, and iron powder, which make up the giant magnetostrictive material, are mixed and the heat treatment conditions are changed. In this study, the heat treatment temperature was varied from 800°C to 1100°C in 100°C incrementsbased on the equilibrium state temperature of each material, and the heat treatment time was set in 30-minute increments from 1 hour to 3 hours. As a result, TbFe2 was confirmed after heat treatment at an electric furnace temperature of 1000°C for 3 hours, although its strength was insufficient. © 2024 The Institute of electrical Engineers of Japan.

关键词： Active noise control

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Effect of laser irradiation on the tribological properties of RF-sputtered nickel oxide (NiO) thin films

arXiv

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arXiv 2023年

作者： Itapu, Srikanth Borra, Vamsi Li, Frank X. Cortes, Pedro Kumar, Mohit Hemanth Electrical and Computer Engineering Program College of STEM Rayen School of Engineering Youngstown State University YoungstownOH44555 United States Department of Electronics & Communication Engineering Alliance University Bengaluru562106 India Chemical Engineering Program College of STEM Rayen School of Engineering Youngstown State University YoungstownOH44555 United States Department of Mechanical Engineering Alliance University Bengaluru562106 India

The present work aims at investigating the effect of laser irradiation on the tribological properties of RF-sputtered NiO thin films deposited on industrial grade aluminum substrate. A semiconductor laser based on Nd:YAG operating at its 4th harmonic wavelength, λ = 266nm with varying laser fluence and spot size of about 5 µm is irradiated on the NiO film. The localized heating allows for smoothening of the NiO film along with contributions to the changes in the stoichiometry of NiO (reduction of excess oxygen). In particular, the effects of tuning laser fluence and the subsequent tribology tests pertaining to the coefficient of friction variations for tribological tests are discussed. © 2023, CC BY.

关键词： Tribology

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Broadband Beamforming via Frequency Invariance Transformation and PARAFAC Decomposition for Jamming Mitigation in V2X Scenarios

Broadband Beamforming via Frequency Invariance Transformatio...

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IEEE Conference on Vehicular Technology (VTC)

作者： Daniel V. de Lima João Paulo J. da Costa Antonio Arlis S. da Silva Giovanni A. Santos José Alfredo R. Vargas Auzuir R. de Alexandria Postgraduate Program in Telecommunications Engineering (PPGET) IFCE Fortaleza Brazil Hamm-Lippstadt University of Applied Sciences (HSHL) Lippstadt Germany Graduate School for Applied Research in North Rhine-Westphalia (PKNRW) Bochum Germany Karlsruhe Institute of Technology (KIT) Karlsruhe Gennany Graduate Program in Computing (PPGC) UFRGS Porto Alegre Brazil Department of Electrical Engineering UnB Brasilia Brazil

ISBN: (数字)9798350387414

ISBN: (纸本)9798350387421

Vehicle-to-Everything (V2X) communication can considerably improve the efficiency and safety of autonomous driving and advanced driver-assistance systems (ADASs). However, V2X communication can be considerably degraded in the presence of cyberattacks, such as radio jamming. Traditionally, beamforming techniques can be applied to increase the signal-to-interference plus noise ratio (SINR). This paper evaluates broadband beamforming in the mmWave spectrum against radio jamming in V2X communication. The exploitation of the mm Wave spectrum in 5G-V2X communication has a natural advantage against radio jamming. First, attenuation is stronger in the mmWave spectrum in the range of 40 GHz or higher than in the traditional 5.9 GHz. Second, to generate broadband radio jamming, the radio jammer requires much more complex hardware and energy consumption. Third, by using broadband beamforming, broadband radio jamming can be considerably attenuated, limiting the degradation of the spectrum by the radio jamming. According to our numerical results, gains of close to 30 dB SINR can be achieved. We propose a broad-band beamforming technique based on the canonical polyadic decomposition via generalized eigenvalue decomposition (CPD-GEVD). The CPD-GEVD broadband beamforming outperforms state-of-the-art beamforming algorithms in most V2X scenarios presented in this paper.

关键词： Vehicular and wireless technologies Array signal processing Interference Attenuation Broadband communication Jamming Millimeter wave communication

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A Dual-Band Circularly Polarized Bi-Sectoral Waveguide Horn Antenna for High Power LEOP TT&C Systems

A Dual-Band Circularly Polarized Bi-Sectoral Waveguide Horn ...

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Radio Science Meeting (AT-AP-RASC), URSI Atlantic and Asia Pacific

作者： Esra Alkin Ceyhan Turkmen Mustafa Secmen Graduate School Yasar University Izmir Turkey Department of Electrical and Electronics Engineering Yasar University Izmir Turkey

In this study, a dual-band circularly polarized bi-sectoral waveguide antenna is proposed, which is used launch and early orbit phases (LEOP) of telemetry, tracking and command (TT&C) applications of satellite systems to almost cover full space together with omni-directional (toroidal) antennas. The structure consists of four parts (pyramidal horn antennas) each having excited by a single inclined slot being cut over circular waveguide. However, because the overall antenna is only fed with a single rectangular waveguide, it works as transceiver (in TX and RX bands simultaneously). The parts belonging to each band have bi-directional patterns being opposite to each other. Therefore, instead of using four separate antennas each being fed by separate rectangular waveguide to cover both directions in dual band (TX and RX bands) in 3D space, one antenna with just one feed is demonstrated as being sufficient for same purpose. For this purpose, an antenna is designed for a Ku-band TT&C application. The results show that the antenna is dual-band over 500 MHz bandwidth around 11.75 GHz (TX) and 13.75 GHz (RX) center frequencies. The antenna has more than 9.5 dBi peak gain in both main lobes and 15 dB return loss at TX band; and has more than 10 dBi peak gain and 10 dB return loss at RX band. Besides, it has less than 3 dB and 3.5 dB axial ratio (AR) values at TX and RX bands within almost 45º and 60º azimuth and elevation beamwidth values, respectively.

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Email Spam Detection Using Logistic Regression and Explainable AI

Email Spam Detection Using Logistic Regression and Explainab...

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International Conference on electrical, Computer and Communication engineering (ECCE)

作者： Sumit Kanti Sarker Ratul Bhattacharjee Md Abu Sufian Md Solaiman Ahamed Md Abu Talha Faiza Tasnim K.M. Nazmul Islam Sharia Tasnim Adrita Department of Computer Science & Engineering (CSE) Faculty of Science & Technology (FST) American International University Bangladesh Dhaka Bangladesh Bachelor of Science in Information Technology (BSIT) Cybersecurity Program Concentrations Washington University of Science and Technology (WUST) VA USA Department of Electrical and Electronics Engineering (EEE) Faculty of Engineering (FE) American International University Bangladesh Dhaka Bangladesh Department of Computer Science and Engineering (CSE) Faculty of Science & Engineering Northern University Bangladesh-(NUB) Dhaka Bangladesh

ISBN: (数字)9798350357509

ISBN: (纸本)9798350357516

Email spam detection is crucial for ensuring a positive user experience and maintaining communication security. This study presents a novel spam detection approach leveraging Logistic Regression, optimized through hyperparameter tuning and enhanced with Explainable Artificial Intelligence. The proposed method is evaluated on a large-scale dataset of emails collected from a real-world spam detection system. Term Frequency-Inverse Document Frequency is utilized for feature extraction, converting email text into numerical representations. XAI introduces interpretability by highlighting critical features such as "pill," "PHP," and "Businessweek," which indicate spam classification patterns. Metrics such as precision, recall, and the confusion matrix are employed to assess the model’s performance, ensuring a balanced evaluation. Hyperparameter optimization using Grid Search CV achieves an optimal regularization parameter (C = 100) and maximum iterations (maxiter=100), resulting in an impressive F1 score of 98.76%, accuracy of 98.82%, precision of 98.62%, and recall of 98.90%.

关键词： Logistic regression Explainable AI Filtering Unsolicited e-mail Computational modeling Predictive models Transformers Frequency conversion Feature extraction Tuning

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Experimental Evaluation of Commercial Powerline Communication System for Monitoring of Sensors in Industrial Processes

Experimental Evaluation of Commercial Powerline Communicatio...

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Mediterranean Electrotechnical Conference (MELECON)

作者： Murilo Oliveira Leme Sergio Luiz Stevan Department of Electronics UTFPR-PG Federal University of Technology -Parana (UTFPR) Ponta Grossa Brazil Postgraduate Program in Electrical Engineering - PPGEE Federal University of Technology - Parana (UTFPR) Ponta Grossa Brazil

ISBN: (数字)9798350387025

ISBN: (纸本)9798350387032

Industrial automation systems use distributed computing architecture, comprising industrial networks with a wiring bus that is standardized to integrate their devices and monitoring process. A number of technologies, in a wide range of application levels, must operate in hostile environments, with high temperatures, humidity and magnetic interference. The Industry 4.0 applications requires that the communication infrastructure provide "last mile" communication services with a high level of reliability, which may increase costs and complexity of that infrastructure. Within such scenario, there is a growing demand for simpler and robust systems for monitoring and supervision of industrial processes. Powerline communication (PLC) is one of such systems that could provide ease of use and maintenance, since it uses the power system for serial digital data communication. This system has been commonly used in home applications, but it carries a great potential for the management of an industrial plant. Here, we present a new concept for the hardware, which collects field signals with PLC for industrial applications, using a Commercial-Of-The-Shelf (COST) modem. Three different setups have been performed, for a specific application that could be integrated to any industrial computer. The system has been experimentally evaluated in severe industrial environments, considering different noise levels, and provided reliable communication.

关键词： Wiring Costs Wireless networks Interference Sensor systems Sensors Power system reliability

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MMA-Net: Multi-Modal Attention Network for 2-D Object Detection in Autonomous Driving

MMA-Net: Multi-Modal Attention Network for 2-D Object Detect...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Abhilash Gaur Shubh Goel Kanishk Goel Seshan Srirangarajan Po-Hsuan Tseng Kai-Ten Feng IIT Delhi-NYCU Taiwan Joint Doctoral Program Bharti School of Telecommunication Technology and Management Indian Institute of Technology Delhi (IIT Delhi) New Delhi India International College of Semiconductor Technology National Yang Ming Chiao Tung University (NYCU) Hsinchu Taiwan Department of Electrical Engineering IIT Delhi New Delhi India Department of Electrical Engineering Bharti School of Telecommunication Technology and Management IIT Delhi New Delhi India Department of Electronic Engineering National Taipei University of Technology Taipei Taiwan Department of Electronics and Electrical Engineering NYCU Hsinchu Taiwan

ISBN: (数字)9798350368741

ISBN: (纸本)9798350368758

Autonomous driving technology relies heavily on sensor data for environment perception. Heterogeneous sensors such as lidar, radar, and camera have their own strengths and limitations. Therefore, relying on any single sensor would restrict the effectiveness of autonomous driving technology. However, integrating data from such heterogeneous sensors poses challenges due to differences in their representations. This article outlines a deep learning network aimed at designing modality-agnostic multi-modal fusion architecture. We study sensor data from different modalities and learn fine-grained representations using modality-specific feature encoders independently. Then, a multimodal attention-based network (MMA-Net) is proposed to fuse the data from heterogeneous modalities. The proposed MMA-Net fuses multi-modal sensor data by jointly exploiting the inter-modality and intra-modality relationships among camera, lidar, and radar sensors. The effectiveness of the proposed multi-modal fusion architecture is demonstrated using 2-D object detection metrics through extensive experiments on a dataset generated using the CARLA simulator.

关键词： Laser radar Fuses Multimodal sensors Radar detection Object detection Signal processing Cameras Speech processing Autonomous vehicles Meteorology

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