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Millimeter-Wave GaAs Ultra-Wideband Medium Power Amplifier and Broadband High-Power Power Amplifier for 5G/6G Applications

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IEEE Journal on Emerging and Selected Topics in Circuits and Systems 2024年第1期14卷 111-121页

作者： Fu, Zi-Hao Li, Ming-Xuan Ma, Tzyh-Ghuang Wu, Chan-Shin Lin, Kun-You National Taiwan University Graduate Institute of Communication Engineering Department of Electrical Engineering Taipei10617 Taiwan National Taiwan University of Science and Technology Department of Electrical Engineering Taipei10607 Taiwan ASUSTek Computer Inc. Taipei11259 Taiwan Ultraband Technologies Inc. Taipei11158 Taiwan

This paper presents an ultra-wideband (UWB) medium power amplifier (MPA) and a broadband high-power power amplifier (HPA) operating at the 5G/6G frequency bands. By using 0.15~\mu \text{m} GaAs pseudomorphic high electron mobility transistor (pHEMT) technology process, the proposed UWB MPA delivers an average small-signal gain of 16.5 dB, a saturation output power (\text{P}_{\mathrm {sat}} ) of 24 dBm, and a peak power-added efficiency (PAE) over 24% from 24 to 38 GHz with a chip area of 2\times1 mm2. The broadband HPA demonstrates a 17-dB average small-signal gain, 29-dBm \text{P}_{\mathrm {sat}} , and a PAE over 28% from 24 to 32 GHz with a 2.4\times1.1 mm2 chip size. The measurement results have demonstrated the great potential of the proposed PA for 5G/6G millimeter-wave applications. © 2011 IEEE.

关键词： Power amplifiers

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Influence of performance and emission of diesel engine with alumina nano material-based catalyst biodiesel using IoT

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International Journal of Power and Energy Conversion 2024年第4期15卷 338-351页

作者： Venkatesh, B. Khan, Mudassir Babu, J. Chinna Nagaraju, C.H. Mohan, R. Madhan Department of Mechanical Engineering Annamacharya Institute of Technology and Sciences Andhra Pradesh Rajampet India Department of Computer Science College of Computer Science Applied College Tanumah King Khalid University P.O. Box 960-61421 Abha Saudi Arabia Department of Electronics and Communication Engineering Annamacharya Institute of Technology and Sciences Andhra Pradesh Rajampet India Department of Electrical and Electronics Engineering Annamacharya Institute of Technology and Sciences India

In this study, the performance and emissions of Al2O3 alkaline cottonseed biodiesel-powered compression ignition engines were predicted. An experiment was conducted using different biodiesel blends made from cottonseed oil under various loading conditions. Biodiesel was produced using ethanol and Cao-mg/Al2O3 as catalysts through the transesterification process and blended with diesel to produce CBDN10, CBDN20, CBDN30, and CBDN40. The CBDN20 blends showed an evident reduction in fuel consumption by 8% and a 12% improvement in thermal efficiency at high static thrust. The use of these blends resulted in minimal CO, CO2, and NOx emissions from engines. These emissions were monitored by an IoT system and analysed with gas analysers, which revealed CBDN20’s ability to reduce nitrogen oxide and hydrocarbon emissions compared to diesel. Additionally, CBDN20 demonstrated improved thermal efficiency and reduced brake-specific fuel consumption compared to the other blends. Copyright © 2024 Inderscience Enterprises Ltd.

关键词： Nitrogen oxides

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Robust Beamfocusing Against Positioning Errors Over Sub-Terahertz LOS Channels 58

Robust Beamfocusing Against Positioning Errors Over Sub-Tera...

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58th Asilomar Conference on Signals, Systems and computers, ACSSC 2024

作者： Uchimura, Sota Ishibashi, Koji Jornet, Josep M. Japan Northeastern University Department of Electrical and Computer Engineering Institute for the Wireless Internet of Things United States

ISBN: (纸本)9798350354058

We consider a robust hybrid beamfocusing scheme against statistical and norm-bounded positioning errors to improve a total system data rates in sub-terahertz (THz) communications systems. In particular, an ergodic sum rate maximization problem is formulated, where the objective function consists of the expectation of spectral efficiencies over positioning errors. The expected values are approximated by Jensen's inequality and Taylor approximation, which enable a joint transmit and receive beamfocusing design by deterministic convex optimization approaches. Numerical results confirm that the proposed robust approach achieves higher data rates than conventional non-robust approaches and a singular value decomposition (SVD) beamfocusing with perfect positioning information. © 2024 IEEE.

关键词： Convex optimization

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Generating Realistic Sound with Prosthetic Hand: A Reinforcement Learning Approach 46

Generating Realistic Sound with Prosthetic Hand: A Reinforce...

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46th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2024

作者： Jeong, Taemoon Yamsani, Sankalp Hong, Jooyoung Park, Kyungseo Kim, Joohyung Choi, Sungjoon Korea University Department of Artificial Intelligence Seoul Korea Republic of University of Illinois Urbana-Champaign Department of Electrical and Computer Engineering ChampaignIL United States Department of Robotics and Mechatronics Engineering Daegu Korea Republic of

ISBN: (纸本)9798350371499

In this study, we tackle the complex task of enabling prosthetic hands to accurately reproduce sounds, a crucial aspect for distinguishing between different materials through auditory feedback. Sound identification, such as discerning a drywall tap from that on a brick wall, significantly enhances the functionality and user experience of prosthetic devices. However, achieving this level of auditory feedback in prosthetic hands poses considerable challenges. We utilize reinforcement learning (RL) techniques to train prosthetic hands in emulating human-like sound characteristics, focusing on key auditory signals like amplitude and onset timing. Our approach integrates a detailed analysis of these sound attributes to direct the prosthetic hand's movements for the sound generation that mimics natural human actions. We developed a tailored reward function incorporating amplitude, onset strength, and timing criteria to ensure the prosthetic hand's movements align closely with the intended human-like sound output. © 2024 IEEE.

关键词： Reinforcement learning

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Benchmarking Convolutional Neural Network Inference on Low-Power Edge Devices 48

Benchmarking Convolutional Neural Network Inference on Low-P...

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48th IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2023

作者： Ferraz, Oscar Araujo, Helder Silva, Vitor Falcao, Gabriel Instituto de Telecomunicações Portugal University of Coimbra Dept. of Electrical and Computer Engineering Portugal Institute of Systems and Robotics Portugal

ISBN: (纸本)9781728163277

The massive adoption of IoT devices, the recent developments in the efficiency of AI systems, and the increase of edge computational power, accelerated the deployment of edge AI systems. The implementation of these systems through the use of low-power embedded devices scattered across the edges of a network allows for reduced latency and cost, compared to traditional cloud-based AI computing systems. As a result of the low-complexity AI models and the available low-power embedded systems on the market, this paper provides a comparative study on the inference performance of convolutional neural networks for different edge devices, by exploiting low-power GPUs and dedicated AI hardware. The benchmark results were able to achieve 864 inferences/s for the Jetson AGX Xavier board on a pre-trained SqueezeNet, while reaching a high power efficiency of 52.6 inferences/s per Watt. For the dedicated Movidius neural stick, the system requires only 1.5 W for processing 24.2 inferences/s. © 2023 IEEE.

关键词： Artificial Intelligence Benchmarking Edge devices GPUs Inference Engine IoT Low-power

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Evaluation of the Explainable AI-NLP Framework for Text Categorization

Evaluation of the Explainable AI-NLP Framework for Text Cate...

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2024 International Conference on Communication, computer Sciences and engineering, IC3SE 2024

作者： Singh, Amar Preet Gupta, Gaurav Soumya, K. Noida Institute Of Engineering And Technology Department Of Electrical & Electronics Engineering Uttar Pradesh Greater Noida India Tula's Institute Department Of Computer Science And Engineering Dehradun India Department Of Computer Science And Information Technology Bangalore India

ISBN: (纸本)9798350366846

Although there has been a decrease in interpretability, significant progress has lately been achieved in developing state-of-the-art models. This assessment provides a thorough analysis of Explainable AI (XAI) within the framework of Natural Language Processing (NLP). This study examines the fundamental classification of descriptions in addition to the many techniques for producing and displaying explanations. The purpose of the survey is to provide a comprehensive study of the many approaches and strategies used to clarify the models' predictions, making it a helpful tool for people who develop NLP models. Additionally, we draw attention to the gaps in the current literature and urge further investigation into potential avenues for this crucial field of study. An experiment is also conducted and the results are discussed in this article. © 2024 IEEE.

关键词： Natural language processing systems

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High Subthreshold Swing a-IGZO Driving TFTs Without Mobility Degradation for Low-Gray Level Image Quality Improvement in Active-Matrix OLED

High Subthreshold Swing a-IGZO Driving TFTs Without Mobility...

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International Symposium, Seminar, and Exhibition, Display Week 2024

作者： An, Soobin Park, Junhyeong Lee, Jinkyu Yun, Yumin Lee, Soo-Yeon Department of Electrical and Computer Engineering SOFT Foundry Institute Seoul National University Seoul Korea Republic of

In this paper, high subthreshold swing (SS) amorphous In-GaZn-O (a-IGZO) thin-film transistors (TFTs) were fabricated using a sputtered Al2O3 layer, which was deposited on an active layer of the conventional bottom-gate a-IGZO TFTs and patterned using photolithography. By optimizing the Al2O3 layer, high SS without mobility degradation could be achieved. © 2024, John Wiley and Sons Inc. All rights reserved.

关键词： Thin film transistors

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Fast yet predictable braking manoeuvers for real-time robot control

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arXiv 2023年第2期56卷 9984-9991页

作者： Hamad, Mazin Gutierrez-Moreno, Jesus Kussaba, Hugo T.M. Mansfeld, Nico Abdolshah, Saeed Swikir, Abdalla Burgard, Wolfram Haddadin, Sami Robotics and Systems Intelligence Munich Institute of Robotics and Machine Intelligence Technical University of Munich Germany Franka Emika GmbH Munich Germany Department of Electrical and Electronic Engineering Omar Al-Mukhtar University Libya Department of Engineering University of Technology Nuremberg Germany Germany

This paper proposes a framework for generating fast, smooth and predictable braking manoeuvers for a controlled robot. The proposed framework integrates two approaches to obtain feasible modal limits for designing braking trajectories. The first approach is real-time capable but conservative considering the usage of the available feasible actuator control region, resulting in longer braking times. In contrast, the second approach maximizes the used braking control inputs at the cost of requiring more time to evaluate larger, feasible modal limits via optimization. Both approaches allow for predicting the robot's stopping trajectory online. In addition, we also formulated and solved a constrained, nonlinear final-time minimization problem to find optimal torque inputs. The optimal solutions were used as a benchmark to evaluate the performance of the proposed predictable braking framework. A comparative study was compiled in simulation versus a classical optimal controller on a 7-DoF robot arm with only three moving joints. The results verified the effectiveness of our proposed framework and its integrated approaches in achieving fast robot braking manoeuvers with accurate online predictions of the stopping trajectories and distances under various braking settings. © 2023, CC BY-NC-ND.

关键词： Braking

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Comparison between experimental and numerical results for piezoelectric signals generated in water-saturated cancellous bone by ultrasound irradiation

Comparison between experimental and numerical results for pi...

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2023 International Congress on Ultrasonics, ICU Beijing 2023

作者： Hosokawa, A. Department of Electrical and Computer Engineering National Institute of Technology Akashi College Akashi674-8501 Japan

The bone formation is considered to be accompanied by the piezoelectric effects in bone. Therefore, the piezoelectric effect under ultrasound irradiation should be elucidated to realize the effective healing. Then, the piezoelectric properties in cancellous bone have been attempted to clarify by complementing experiments and simulations with each other. In this paper, the piezoelectric signals generated in water-saturated cancellous bone by ultrasound irradiation were experimentally and numerically observed, and the effect of the trabecular orientation was investigated. The experimental observation was performed by the piezoelectric cell (PE-cell), which corresponds to an ultrasound receiver using the cancellous bone specimen as a piezoelectric element. The numerical observation was performed by the piezoelectric finite-difference time-domain (PE-FDTD) method, which is an elastic FDTD method with piezoelectric constitutive equations. In both the experimental and simulated results, the piezoelectric signal amplitude increased with the mean intercept lengths (MILs) of the trabecular elements and the pore spaces or the strength of the trabecular orientation. From the fact that the ultrasound propagation in water-saturated cancellous bone can depend on the trabecular orientation, it was considered that the ultrasound properties could be largely associated with the piezoelectric properties. © 2024 institute of Physics Publishing. All rights reserved.

关键词： Piezoelectricity

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The Cascade PI Controller Design for Hydrogen Electric Bike Systems 13

The Cascade PI Controller Design for Hydrogen Electric Bike ...

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13th International electrical engineering Congress, iEECON 2025

作者： Surakan, Wuttinan Niyomthai, Monton Suyapan, Apichai Narongrit, Tosaporn Areerak, Kongpan Suranaree University of Technology School of Electrical and Computer Engineering Institute of Engineering Nakhon Ratchasima Thailand Suranaree University of Technology School of Electrical Engineering Institute of Engineering Nakhon Ratchasima Thailand King Mongkut's University of Technology Thonburi Department of Electrical Engineering Bangkok Thailand

ISBN: (纸本)9798331543952

The paper presents the cascade PI controller design for a DC/DC converter. The hydrogen is used as the main energy source feeding to the fuel cell stack in which the voltage generated from the fuel cell is fluctuated. As a result, the DC/DC converter is used to regulate the voltage feeding to the electric bike driving systems. The controller design using the standard second order system is proposed. The simulation results from MATLAB/SIMULINK shows that the resulting cascade PI controller can regulate the voltage even the power load level is varied. The considered system with the controller designed by the proposed method can provide the good voltage response until the rated power can be achieved. The ripple voltage in the steady state is under 0.5% following the standard ISO-21780-2020. © 2025 IEEE.

关键词： Proportional control systems

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