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2024 United States National Committee of URSI National Radio Science Meeting, USNC-URSI NRSM 2024

作者： Ullah, Kefayet Venkatakrishnan, Satheesh Bojja Volakis, John L. Department of Electrical and Computer Engineering Florida International University MiamiFL33174 United States

ISBN: (纸本)9781946815194

This paper presents a new full-duplex transceiver exhibiting wideband digital self-interference cancellation (DSIC). To achieve strong cancellation, a direct-RF sampling architecture is employed to significantly reduce the number of analog components in the transceiver chain. The entire transceiver is realized using a single field programmable gate array (FPGA) as part of a radio-frequency system-on-chip (RFSoC) development kit. This RFSoC integrates RF-sampling data converters, i.e., digital-to-analog converter (RF-DAC) and analog-to-digital converter (RF-ADC) along with the FPGA fabric on the same chip. The employed 5G OFDM waveform is synthesized on the XCZU28DR chip as part of the transceiver’s testbed. The efficacy of the proposed transceiver and the canceller algorithm is demonstrated using SI cancellation ratio (SICR) level. Hardware measurements demonstrated 22 dB of digital cancellation across a modulation bandwidth of 200 MHz. To the best of the author’s knowledge, this is the first-ever demonstration of a wideband radio self-interference cancellation at the digital back-end. © 2024 IEEE. All rights reserved.

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Performance Assessment of CU3BiS3 Heterojunction Solar Cell with WS2 as Cd-Free Buffer Layer 52

Performance Assessment of CU3BiS3 Heterojunction Solar Cell ...

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52nd IEEE Photovoltaic Specialist Conference, PVSC 2024

作者： Das, Sandip Kennesaw State University Department of Electrical and Computer Engineering MariettaGA30060 United States

ISBN: (纸本)9781665464260

Cu3BiS3 is an emerging competitive photovoltaic absorber material for affordable, earth abundant, and non-toxic thin film solar cells. In this paper, we report on the performance enhancement of Cu3BiS3-based solar cell by using tungsten disulfide (WS2) as a Cd-free, non-toxic buffer layer. Our numerical simulation results revealed that WS2 is a superior candidate compared to the conventional CdS buffer layer. Our proposed heterojunction solar cell having a device configuration of Al/ITO/WS2/Cu3BiS3/Mo/SLG resulted in a high open circuit voltage (Voc) of 777 mV and a power conversion efficiency of 14.16% under simulated AM1.5 radiation with 3.0μm thick photo-absorber layer. This reflects a staggering 34 % enhancement in Voc and 35% improvement in efficiency compared to the traditional cell structure having n-type CdS buffer. Our results indicate the high potential of WS2 to realize non-toxic and more efficient CU3BiS3-based thin film solar cells. © 2024 IEEE.

关键词： II-VI semiconductors

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Accurate and Efficient Implementations of Recursive Filtering based on SIMD and Cascaded Form 14

Accurate and Efficient Implementations of Recursive Filterin...

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2024 IEEE 14th Annual Computing and Communication Workshop and Conference, CCWC 2024

作者： Zhai, Haotian Paris, Bernd-Peter George Mason University Department of Electrical and Computer Engineering FairfaxVA22030 United States

ISBN: (纸本)9798350360134

Implementation of recursive filtering based on parallel computation on SIMD is more difficult than non-recursive filtering due to data dependency. To that end, this paper proposes an efficient algorithm for computing the recursive equation by transferring the data dependency from individual samples to multiple blocks of samples. Our algorithm is proposed based on cascaded forms;It will be illustrated that the recursive filter built by cascaded forms can deal with the rounding error issue in some filter design. The performance evaluation results of our algorithms are presented not only by the number of instructions but the real spent clock cycles. The throughput of our algorithm is tested on different types of micro-architecture with data rates approaching 260 MHz. © 2024 IEEE.

关键词： Parallel architectures

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Fluid Antenna Systems for Terahertz Wireless Power Transfer

Fluid Antenna Systems for Terahertz Wireless Power Transfer

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2024 IEEE Global Communications Conference, GLOBECOM 2024

作者： Mavrovoltsos, Triantafyllos Demarchou, Eleni Psomas, Constantinos Krikidis, Ioannis University of Cyprus Irida Research Centre for Communication Technologies Department of Electrical and Computer Engineering Cyprus

ISBN: (纸本)9798350351255

Sixth generation networks will establish the terahertz (THz) era, introducing numerous potential applications for wireless power transfer (WPT). In this work, we focus on a fluid-antenna (FA)-aided WPT system which operates over the THz bands, featuring a non-monotonic diode-based rectifier. By taking into account the circuit's unconventional behavior, we first exploit a linear piece-wise function to approximate rectifier's input-output power relationship. Based on this, we provide an analytical framework in terms of the energy outage probability for three FA port selection (PS) schemes, namely (i) the input-based selection, (ii) the harvesting-based selection, and (iii) the random selection, each corresponding to different complexity and performance. Numerical results which validate our analysis, reveal a novel utilization of FAs, stemming from the alignment of the PS process with the non-monotonic harvesting characteristics. © 2024 IEEE.

关键词： Resonant tunneling diodes

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Device Processing Challenges for Miniaturized Sensing Systems Targeting Biological Fluids

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Biomedical Materials and Devices 2023年第1期1卷 82-98页

作者： Stoukatch, S. Dupont, F. Redouté, J.-M. Microsys Lab Department of Electrical Engineering and Computer Science Liege University Seraing Belgium

This article presents a review of device processing technologies used in the fabrication of biomedical systems, and highlights the requirements of advanced manufacturing technology. We focus on biomedical systems that perform diagnostics of fluidic specimens, with analytes that are in the liquid phase. In the introduction, we define biomedical systems as well as their versatile applications and the essential current trends. The paper gives an overview of the most important biomolecules that typically must be detected or analyzed in several applications. The paper is structured as follows. First, the conventional architecture and construction of a biosensing system is introduced. We provide an overview of the most common biosensing methods that are currently used for the detection of biomolecules and its analysis. We present an overview of reported biochips, and explain the technology of biofunctionalization and detection principles, including their corresponding advantages and disadvantages. Next, we introduce microfluidics as a method for delivery of the specimen to the biochip sensing area. A special focus lies on material requirements and on manufacturing technology for fabricating microfluidic systems, both for niche and mass-scale production segments. We formulate requirements and constraints for integrating the biochips and microfluidic systems. The possible impacts of the conventional microassembly techniques and processing methods on the entire biomedical system and its specific parts are also described. On that basis, we explain the need for alternative microassembly technologies to enable the integration of biochips and microfluidic systems into fully functional systems. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC 2022. Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s);author self-archiving of the accepted manuscript version of

关键词： Alternative microassembly techniques Biological analysis Biomedical system Biosensors

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An Optimization-Based HVAC Load and PV Disaggregation Methodology With Contextual Supervision

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IEEE Transactions on Smart Grid 2025年第4期16卷 3457-3460页

作者： Kim, Hyeoniin Yu, Min Gyung Wu, Di Lu, Ning Systems Center Electrical and Computer Engineering Department RaleighNC27606 United States Pacific Northwest National Laboratory RichlandWA99354 United States

This letter presents an optimization-based Heating, Ventilation, and Air Conditioning (HVAC) and PV disaggregation approach. This letter builds on the previous works of authors, which discuss HVAC disaggregation strategy for aggregated levels without requiring sub-metered information. This letter expands on previous works to discuss optimization-based HVAC disaggregation by varying PV penetration scenarios with joint disaggregation of HVAC load and PV. © 2010-2012 IEEE.

关键词： HVAC Dictionaries Load modeling Estimation Accuracy Vectors Training Optimization Market research Data mining

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Determination of Wavelength Pairs for Electron Temperature Calculation Using Line Intensity Ratio Method in a Helium Atmospheric Pressure Plasma Jet 50

Determination of Wavelength Pairs for Electron Temperature C...

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50th IEEE International Conference on Plasma Science, ICOPS 2023

作者： Dhamala, A.S. Manzi, J. Brownin Subbaraman, H. Kandadai, N. Boise State University Department of Electrical and Computer Engineering BoiseID United States Oregon State University Department of Electrical Engineering and Computer Science CorvallisOR United States

ISBN: (纸本)9798350302660

In recent years, atmospheric pressure plasma jets(APPJ) have received wider attention and applications due to many of their advantages such as cost efficiency, simplicity, and low-temperature operation.[1] This has also increased the need for the study of the properties of the APPJ.[2] Two important discharge parameters for study are the electron temperature and electron density. The effect of these parameters on the plasma jets and their applications such as the plasma jet printer also needs to be studied to build more efficient plasma jet systems. © 2023 IEEE.

关键词： Electron temperature

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Dysarthric Speech Recognition using Depthwise Separable Convolutions: Preliminary Study 12

Dysarthric Speech Recognition using Depthwise Separable Conv...

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12th International Conference on Speech Technology and Human-computer Dialogue, SpeD 2023

作者： Shahamiri, Seyed Reza Mandal, Krishnendu Sarkar, Sudeshna The University of Auckland Faulty of Engineering Department of Electrical Computer and Software Engineering Auckland New Zealand Indian Institute of Technology Computer Science & Engineering Department Kharagpur India

ISBN: (纸本)9798350327977

As a neurological disability that affects muscles involved in articulation, dysarthria is a speech impairment that leads to reduced speech intelligibility. In severe cases, these individuals could also be handicapped and unable to interact with digital devices. For such individuals, Automatic Speech Recognition (ASR) technologies could be life changing by enabling them to communicate with others as well as computing devices via voice commands. Nonetheless, ASR systems designed to recognize healthy speech have shown very poor performance to transcribe dysarthric speech, signaling the need to design ASR specifically tailored for dysarthria. Dysarthric Speech Recognition (DRS) research has progressed gradually because of the challenges the research community faces such as the scarcity of dysarthric speech that does not allow the researchers to design deeper acoustic models needed to better learn dysarthric speech variations. In this paper we report on our preliminary findings to improve our previous DSR called Speech Vision and study the effects of Separable Convolutional neurons to improve its acoustic model. Speech Vision is a novel Dysarthric Speech Recognition system that learns to recognize the shape of the words uttered by dysarthric speakers instead of recognizing phone sequences and then mapping them to words. Experiments conducted on the utterances provided by all UA-Speech dysarthric speakers indicate the proposed Depthwise separable architecture provided better word recognition accuracies compared to the original Speech Vision's architecture across all dysarthric speech intelligibility classes. © 2023 IEEE.

关键词： Convolution

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DeRL: Coupling Decomposition in Action Space for Reinforcement Learning Task

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IEEE Transactions on Emerging Topics in Computational Intelligence 2024年第1期8卷 1030-1043页

作者： He, Ziming Li, Jingchen Wu, Fan Shi, Haobin Hwang, Kao-Shing Northwestern Polytechnical University School of Computer Science Xi'an710072 China National Sun Yat-sen University Department of Electrical Engineering Kaohsiung80424 Taiwan

This paper is concerned with complex reinforcement learning tasks whose observations are difficult to characterize as appropriate inputs for policy mapping. The representation learning technique is leveraged to extract the features from the observations for optimal action generation. In literature, the action vector, which consists of actions in each dimension, is usually learned from the full features. However, we find empirically that different actions may be only highly related to small part of the features and weakly depend on the rest. Therefore, this unified learning strategy may lead to performance degradation, and a separate learning method is motivated. In this paper, we propose a novel method called Decoupled Reinforcement Learning (DeRL) that decomposes action space by replacing the policy network with decoupled sub-policy group. To cater to all types of tasks where agents. actions in different dimensions can be either weakly correlated or strongly correlated, the Bidirectional Recurrent Neural Network (Bi-RNN) is added as an essential component to capture further shared features for generating more accurate action. In this framework, the decoupled policy network maintains joint representations required by the decision of all actions in different dimensions while decreasing preference in the learning process. In addition, we give a theoretical analysis of DeRL from the perspective of information theory, which shows the difference in information loss between DeRL and others. The performance of the proposed method has been verified by contrastive experiments on 12 tasks, including Mujoco, Atari, and other popular environments. © 2017 IEEE.

关键词： Reinforcement learning

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Reconfigurable and Reusable Soft Modular Blocks Assembly Soft electronics can be applied to various areas where new form factors are desired, making them attractive to academia and industry alike

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Information Display 2022年第6期38卷 14-18页

作者： Yoon, Jaeyoung Kim, Hayun Hong, Yongtaek Department of Electrical and Computer Engineering Seoul National University Korea Republic of

Soft electronics have received significant attention from academia and industry because they can be applied to various areas where new form factors are desired, such as concave or convex displays, multi-axis curvature vehicle displays, and wearable or body attachable stretchable displays. In particular, the use of SHE technology has been widely investigated for early adoption of the soft electronics concept in commercial products, because it can fully utilize the advantages of existing mature technology (i.e., high-performance integrated circuit chips and mini-or microLED chips). Furthermore, SMEBs assembly satisfies individual customization of various functions and shapes for electronic systems and enables unique personal device production in a simple way, departing from the ready-made designs. Two bonding techniques have been developed for assembling modularized soft blocks. Using irreversible and robust bonding, it is possible to create a display device that operates under high strain, with high potential for use as a wearable or body-attachable display. The introduction of SCPs on modular blocks enables rapid assembly of soft devices in various configurations, leading to reconfigurable and reusable block assembly. The Lego-like, Do-It-Yourself, soft modular LED assembly is believed to be a big steppingstone for future wearable sensor and display applications. © 2022, John Wiley and Sons Inc. All rights reserved.

关键词： Display devices

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