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arXiv 2022年

作者： Cheng, Chin-Yi Yang, Chien-Yi Kuo, Yi-Hsiang Wang, Ren-Chu Cheng, Hao-Chung Huang, Chung-Yang Department of Electrical Engineering National Taiwan University Taiwan Department of Computer Science and Engineering University of California San Diego United States Graduate Institute of Electronics Engineering National Taiwan University Taiwan College of Computing The Georgia Institute of Technology United States Department of Electrical Engineering Graduate Institute of Communication Engineering National Taiwan University Taiwan Center for Quantum Science and Engineering National Taiwan University Taiwan Physics Division and Mathematics Division National Center for Theoretical Sciences Taiwan Quantum Computing Center Taiwan Department of Electrical Engineering National Taiwan University Taiwan

Qubit Mapping is a critical aspect of implementing quantum circuits on real hardware devices. Currently, the existing algorithms for qubit mapping encounter difficulties when dealing with larger circuit sizes involving hundreds of qubits. In this paper, we introduce an innovative qubit mapping algorithm, Duostra, tailored to address the challenge of implementing large-scale quantum circuits on real hardware devices with limited connectivity. Duostra operates by efficiently determining optimal paths for double-qubit gates and inserting SWAP gates accordingly to implement the double-qubit operations on real devices. Together with two heuristic scheduling algorithms, the Limitedly-Exhausitive (LE) Search and the Shortest-Path (SP) Estimation, it yields results of good quality within a reasonable runtime, thereby striving toward achieving quantum advantage. Experimental results showcase our algorithm's superiority, especially for large circuits beyond the NISQ era. For example, on large circuits with more than 50 qubits, we can reduce the mapping cost on an average 21.75% over the virtual best results among QMAP, t|ket〉, Qiskit and SABRE. Besides, for mid-size circuits such as the SABRE-large benchmark, we improve the mapping costs by 4.5%, 5.2%, 16.3%, 20.7%, and 25.7%, when compared to QMAP, TOQM, t|ket〉, Qiskit, and SABRE, respectively. Copyright © 2022, The Authors. All rights reserved.

关键词： Qubits

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Adaptive Diffusion Priors for Accelerated MRI Reconstruction

arXiv

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arXiv 2022年

作者： Güngör, Alper Dar, Salman U.H. Öztürk, Şaban Korkmaz, Yilmaz Bedel, Hasan A. Elmas, Gokberk Ozbey, Muzaffer Çukur, Tolga Department of Electrical and Electronics Engineering Bilkent University Ankara06800 Turkey Bilkent University Ankara06800 Turkey ASELSAN Research Center Ankara06200 Turkey Department of Electrical and Electronics Engineering Amasya University Amasya05100 Turkey Neuroscience Program Bilkent University Ankara06800 Turkey

Deep MRI reconstruction is commonly performed with conditional models that dealias undersampled acquisitions to recover images consistent with fully-sampled data. Since conditional models are trained with knowledge of the imaging operator, they can show poor generalization across variable operators. Unconditional models instead learn generative image priors decoupled from the operator to improve reliability against domain shifts related to the imaging operator. Recent diffusion models are particularly promising given their high sample fidelity. Nevertheless, inference with a static image prior can perform suboptimally. Here we propose the first adaptive diffusion prior for MRI reconstruction, AdaDiff, to improve performance and reliability against domain shifts. AdaDiff leverages an efficient diffusion prior trained via adversarial mapping over large reverse diffusion steps. A two-phase reconstruction is executed following training: a rapid-diffusion phase that produces an initial reconstruction with the trained prior, and an adaptation phase that further refines the result by updating the prior to minimize data-consistency loss. Demonstrations on multi-contrast brain MRI clearly indicate that AdaDiff outperforms competing conditional and unconditional methods under domain shifts, and achieves superior or on par within-domain performance. Copyright © 2022, The Authors. All rights reserved.

关键词： Magnetic resonance imaging

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Design and Implementation of Smart Street Lighting System Employing Esp-Mesh Network

SSRN

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SSRN 2023年

作者： Fuada, Syifaul Duttagupta, Subhasri Adiono, Trio Siregar, Lindawani Program Studi Sistem Telekomunikasi Universitas Pendidikan Indonesia West Java Province Bandung Indonesia Department of Computer Science and Engineering Amrita Viswa Vidyapeetham Keralam Amritapuri-Campus 690525 India Electrical Engineering Department School of Electrical Engineering and Informatics Institut Teknologi Bandung West Java Province Bandung Indonesia Teaching Factory of Manufacturing Electronics Politeknik Negeri Batam Kepulauan Riau Province Batam Indonesia

Street lighting is a public facility that gives highway users’ convenience during their nighttime trips, making it essential to be controlled and monitored using IoT technology. This study aimed to develop a smart lighting system connected through a Mesh network. The system monitors the street light and automatically controls it using the ESP8266 module, a microcontroller with Wi-Fi built-in. The options in selecting the lamp type include Halogen, Fluorescent, LED, or Incandescent. In general, LED is used because it has an advantage in energy-saving over other lamp types. Moreover, the system is equipped with automatic light intensity control through a dimming technique by Pulse Width Modulation (PWM), while BH1750 is used as a light sensor. Furthermore, it monitors the environmental temperature and humidity using DHT22. The communication between the lighting module is based on ESP-Mesh because each node is connected and forwarding data to the destination and the coverage area. ESP-Mesh allows the wireless network to have a scalable architecture in a broader area. It has features to self-organize and self-configure, implying the network could be built and maintained autonomously. Additionally, the system has a web server service with access to control each node and find out the mesh routing table. The results showed that each node could be configured as a mesh network using ESP8266, which sends dimming commands and reads the sensors. The dimming and intensity control was tested using real public street light called NL200D LED module and an off-the-self dimming control driver module, N-Channel MOSFET FQP30N06L. Furthermore, a Mesh connection was tested using five super bright 3mm LEDs representing real street light due to the limitation of the LED module in the laboratory. The street light has three control modes, including on/off-based, intensity control-based or dimming control manually through the website, and intensity control-based automatically using the two se

关键词： Mesh generation

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Analysis of DFIG differential protection based on Park transform

Analysis of DFIG differential protection based on Park trans...

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2021 IEEE PES Innovative Smart Grid Technologies Conference - Latin America, ISGT Latin America 2021

作者： De Queiroz, Janailson Maciel Barros, Luciano Sales Barbosa, Daniel Graduate Program on Electrical and Computer Engineering Federal Un. of Rio Grande Do Norte Natal Brazil Federal Un. of Paraíba João Department of Computer Systems Pessoa Brazil

ISBN: (纸本)9781665444217

In recent years, the use of wind energy in the world has grown. Consequently, the need for studies related to the impact of wind turbines on the electrical system has increased including protection of them and associated equipment. For DFIG-based wind turbines, differential protection has recently been proposed, however, there are few studies on this type of application and in this paper it proposes criteria in the decision-making using the Park transform in which, in addition to the restriction current, voltage level and current direction at the stator terminals are considered. In a DFIG operating with 1.51 MW tests of faults internal and external to the protection zone were made, of the single-phase and three-phase type with various levels of voltage drops. Interturn faults in the rotor and stator of the machine were also tested with various levels of defects. So, with the proper definition of the operating logic, it was possible to show the effectiveness of the protection. © 2021 IEEE.

关键词： Wind power

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In-situ dehydrogenation impact on amorphous InGaZnO Thin-Film Transistors

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Surfaces and Interfaces 2025年 70卷

作者： Lee, Junseo Lee, Sein Park, Jeong-Min Ham, Wooho Yoon, Jeong Hyun Namgung, Seok Daniel Kwon, Jang-Yeon School of Integrated Technology Yonsei University Seoul 03722 South Korea BK21 Graduate Program in Intelligent Semiconductor Technology Yonsei University Incheon 21983 South Korea School of Electrical and Electronics Engineering Chung-Ang University Seoul 06974 South Korea

Incorporating various elements in high-performance amorphous oxide semiconductor (AOS) thin-film transistors (TFTs) for the stable operation, resolution, and reliability of high-performance displays has garnered much research interest. Among those studied, hydrogen, the lightest element, defects in AOS that hinder stable operation, so it has become necessary to be able to detect its level and understand its effects. In addition, tracking and controlling the hydrogen concentration during initial AOS growth and post processing is crucial. In this study, we adjusted the hydrogen content within amorphous InGaZnO films by in-situ dehydrogenation, which is a method controlling the RF sputtering power during deposition. We found that the hydrogen concentration was decreased by 79.8 %, from 8.22 × 10¹⁶ /cm² to 1.62 × 10¹⁶ /cm² at an RF sputtering power of 100 W and 400 W, respectively. Dehydrogenation decreased defect bonding within the thin film, which subsequently improved the positive bias stress stability of the AOS TFT from 2.64 to 0.87 V. Thus, we anticipate that our in-situ dehydrogenation method significantly contributes to the elimination of post dehydrogenation process during TFT fabrication. © 2025

关键词： A-IGZO Dehydrogenation Hydrogen Oxide semiconductor Sputtering power Thin-film transistor

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Evaluation of the metal oxide surge arresters degradation based on the loss tangent

Evaluation of the metal oxide surge arresters degradation ba...

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22nd International Symposium on High Voltage engineering (ISH 2021)

作者： V. R. N. Barbosa E. G. Costa A. F. Leite Neto I. F. Carvalho P. F. Castro J. P. C. Souza J. V. J. Melo G. R. S. Lira Electrical Engineering Graduate Program Campina Grande Brazil Department of Electrical Engineering Federal University of Campina Grande Campina Grande Brazil

Metal Oxide Surge Arresters (MOSAs) are equipment used to protect equipment of electrical Power Systems (EPSs). In this work, a technique is proposed to assess the level of MOSAs degradation based on the loss tangent calculation. The degradation of surge arresters, as well as other electrical equipment, can also be assessed by means of the loss tangent that varies with the voltage and the level of degradation. Thus, its value tends to increase according to the time of use of the equipment. A high value of the loss tangent is indicative of a failure. For the development of the proposed technique, tests in a high voltage laboratory were carried out in order to build a database. In these tests, different operating conditions were simulated to verify the behavior of the loss tangent curve, considering the surge arrester as being in good and defective condition. Based on the values obtained in the tests, it was observed that for each operational state of the evaluated components, different curves of the loss tangent were obtained, in addition to verifying that the more degraded the surge arrester is, the greater the value of the loss tangent. Thus, the loss tangent can be used to assess the operational condition of the MOSAs.

关键词： arresters

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MICROFLUIDIC PLATFORM FOR MULTI-FREQUENCY VISCOELASTIC PHENOTYPING OF SINGLE CELLS 25

MICROFLUIDIC PLATFORM FOR MULTI-FREQUENCY VISCOELASTIC PHENO...

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25th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2021

作者： Lai, Andre Dong, Alan Lustig, Michael Sohn, Lydia L. UC Berkeley-UC San Francisco Graduate Program in Bioengineering University of California BerkeleyCA United States Electrical Engineering and Computer Sciences University of California BerkeleyCA United States Department of Mechanical Engineering University of California BerkeleyCA United States

ISBN: (纸本)9781733419031

Biomechanics plays an integral role in cancer development and progression. Accurately quantifying the mechanical properties of cells would enable a more comprehensive understanding of cancer, complementing conventional biochemical and genetic analyses. Here, we introduce a microfluidic platform for measuring single cell viscoelasticity at multiple frequencies in a high-throughput and label-free manner. Using the Coulter principal and a unique microfluidic channel geometry, our device records resistance pulses in order to estimate a cell's viscoelastic phenotype. We demonstrate our platform's capabilities by measuring three breast epithelial cell lines. © 2021 MicroTAS 2021 - 25th International Conference on Miniaturized Systems for Chemistry and Life Sciences. All rights reserved.

关键词： Biomechanics

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A study on estimation of traveling direction for pedestrian dead reckoning by using inertial sensors 9

A study on estimation of traveling direction for pedestrian ...

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9th IEEE Global Conference on Consumer electronics, GCCE 2020

作者： Matsumoto, Takumi Fujii, Masahiro Utsunomiya University Graduate Program in Information Electrical and Electronics Systems Engineering 7-1-2 Yoto Utsunomiya Tochigi Japan

ISBN: (纸本)9781728198026

In this paper, we propose a new method to estimate the traveling direction for pedestrian by applying IMU (Inertial Measurement Unit) and PCA (Principal Component Analysis) to sensor information from a smartwatch. Because a result of PCA do not have orientation information, an estimate of the traveling direction includes an indeterminacy problem. We show that the proposed method can solve this problem and provide high accuracy in the traveling direction estimation by walking experiments. © 2020 IEEE.

关键词： Principal component analysis

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Compressive optic neuropathy by pituitary adenoma: may making radiomics delta provide prognostic value after surgery?

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European radiology 2023年第11期33卷 7479-7481页

作者： Te-Ming Lin Chieh-Yi Chen Hsiao-Wen Chung Department of Radiology Taipei Veterans General Hospital Taipei Taiwan. Department of Neurosurgery Taoyuan General Hospital Taoyuan Taiwan. Graduate Institute of Biomedical Electronics and Bioinformatics Department of Electrical Engineering National Taiwan University Taipei 10617 Taiwan. chunghw@ntu.edu.tw.

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Sustained robust exciton emission in suspended monolayer WSe2 within the low carrier density regime for quantum emitter applications

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APL Materials 2024年第3期12卷

作者： Chen, Zheng-Zhe Chang, Chiao-Yun Tsai, Ya-Ting Tsai, Po-Cheng Lin, Shih-Yen Shih, Min-Hsiung Research Center for Applied Sciences Academia Sinica Taipei11529 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Electrical Engineering National Taiwan Ocean University Keelung20224 Taiwan Department of Photonics Institute of Electro-Optical Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Graduate Institute of Electronics Engineering National Taiwan University Taipei10617 Taiwan Department of Photonics National Sun Yat-sen University Kaohsiung80424 Taiwan

The development of semiconductor optoelectronic devices is moving toward low power consumption and miniaturization, especially for high-efficiency quantum emitters. However, most of these quantum sources work at low carrier density regions, where the Shockley-Read-Hall (SRH) recombination may be dominant and seriously reduce the emission efficiency. In order to reduce the effect of carrier trapping and sustain a strong photoluminescence (PL) emission under low power pumping conditions, we investigated the influence of "suspending" a monolayer of tungsten diselenide (WSe2), a novel two-dimensional quantum material. Not only the PL intensity but also the fundamental photoluminescence quantum yield (PLQY) has exhibited a huge, order-scale enhancement through suspending;even surprisingly, we found the PLQY improvement to be far significant under small pumping powers and observed an exponential increase in tendency toward an even lower carrier density region. With its strong excitonic effect, suspended WSe2 offers a solution to reduce carrier trapping and participate in non-radiative processes. Moreover, in the low-power range, where SRH recombination dominates, suspended WSe2 exhibited a remarkably higher percentage of excitonic radiation compared to contacted WSe2. Herein, we quantitatively demonstrate the significance of the suspended WSe2 monolayer in a low carrier density region, highlighting its potential for developing compact, low-power quantum emitters in the future. © 2024 Author(s).

关键词： Selenium compounds

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