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152 results on '"Lin, Shuyi"'

1. Specification Generation for Neural Networks in Systems

Author

Chaudhary, Isha, Lin, Shuyi, Tan, Cheng, and Singh, Gagandeep

Subjects
Computer Science - Artificial Intelligence, Electrical Engineering and Systems Science - Systems and Control
Abstract

Specifications - precise mathematical representations of correct domain-specific behaviors - are crucial to guarantee the trustworthiness of computer systems. With the increasing development of neural networks as computer system components, specifications gain more importance as they can be used to regulate the behaviors of these black-box models. Traditionally, specifications are designed by domain experts based on their intuition of correct behavior. However, this is labor-intensive and hence not a scalable approach as computer system applications diversify. We hypothesize that the traditional (aka reference) algorithms that neural networks replace for higher performance can act as effective proxies for correct behaviors of the models, when available. This is because they have been used and tested for long enough to encode several aspects of the trustworthy/correct behaviors in the underlying domain. Driven by our hypothesis, we develop a novel automated framework, SpecTRA to generate specifications for neural networks using references. We formulate specification generation as an optimization problem and solve it with observations of reference behaviors. SpecTRA clusters similar observations into compact specifications. We present specifications generated by SpecTRA for neural networks in adaptive bit rate and congestion control algorithms. Our specifications show evidence of being correct and matching intuition. Moreover, we use our specifications to show several unknown vulnerabilities of the SOTA models for computer systems.

Published
2024

3. COVID-19 Detection in Chest X-ray Images Using Swin-Transformer and Transformer in Transformer

Author

Jiang, Juntao and Lin, Shuyi

Subjects
Electrical Engineering and Systems Science - Image and Video Processing, Computer Science - Computer Vision and Pattern Recognition
Abstract

The Coronavirus Disease 2019 (COVID-19) has spread globally and caused serious damage. Chest X-ray images are widely used for COVID-19 diagnosis and the Artificial Intelligence method can increase efficiency and accuracy. In the Challenge of Chest XR COVID-19 detection in Ethics and Explainability for Responsible Data Science (EE-RDS) conference 2021, we proposed a method that combined Swin Transformer and Transformer in Transformer to classify chest X-ray images as three classes: COVID-19, Pneumonia, and Normal (healthy) and achieved 0.9475 accuracies on the test set.

Published
2021

4. A Flexible Foreign Object Detection Method Based on Arrayed Vertical-Decoupled Coils for Wireless Power Transfer Systems

Author

Song, Huishu, Huang, Xiaosheng, Lin, Shuyi, Lin, Ruping, Huang, Jing, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Ma, Chengbin, editor, Zhang, Yiming, editor, Li, Siqi, editor, Zhao, Lei, editor, Liu, Ming, editor, and Zhang, Pengcheng, editor

Published
2023
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26. Lanthanium nitride LaN9 featuring azide units: the first metal nine-nitride as a high-energy-density material.

Author

Lin, Shuyi, Chen, Jingyan, Zhang, Bi, Hao, Jian, Xu, Meiling, and Li, Yinwei

Abstract

High-pressure phase diagrams of the La–N binary system were systematically constructed using the CALYPSO method and first-principles calculations. In addition to the pressure-induced La–N compounds reported previously, we have uncovered a hitherto unknown LaN9 structure in Pm3¯ symmetry stabilized within a narrow pressure range of 20–24.5 GPa. Notably, LaN9 stands as the first thermodynamically stable metal nine-nitrogen compound, featuring centrosymmetric linear N3 anion units and an edge-sharing LaN12 icosahedron. Charge transfer between the La and N atoms plays a crucial role in facilitating structural stability. Furthermore, we identified a novel Cm phase for LaN8, which has a lower enthalpy compared to the previously reported phase. N atoms in Cm LaN8 are polymerized into infinite N∞ chains. Calculations demonstrate the potential recoverability of LaN9 and Cm LaN8 under atmospheric conditions while preserving their initial polynitrogen configuration. From the perspective of detonation pressure and detonation velocity, LaN9 and Cm LaN8 exhibit excellent explosive performance in comparison to TNT and HMX, with estimated energy densities of 0.9 and 1.54 kJ g−1, respectively, indicating their potential utility as high-energy-density materials. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Load-Independent Push–Pull Class-<inline-formula><tex-math notation="LaTeX">$\Phi _{2}$</tex-math></inline-formula> Inverter With Single Compact Three-Winding Inductor

Author

Huang, Xiaosheng, Lin, Yongshu, Dou, Yi, Lin, Shuyi, and Huang, Jing

Abstract

This article proposes a push–pull class-$\Phi _{2}$ inverter with a single three-winding integrated inductor. A design methodology is presented to achieve load-independent operation of the proposed class $\Phi _{2}$ inverter, ensuring consistent soft-switching operation and constant voltage gain under varying load conditions. A compact magnetic structure is proposed to implement the three-winding integrated inductor, which distinctly reduces the number and size of magnetic components compared with conventional class $\Phi _{2}$ inverters. By flux cancellation and core sharing, the magnetic integration not only reduces the inductor's overall volume and losses but also maintains the inverter's high efficiency. A 6.78-MHz LCC-S resonant wireless power transfer prototype is built to validate the proposed methodology and the magnetic structure. Furthermore, an active push–pull class-$\Phi _{2}$ rectifier is implemented and demonstrates the load-independent resistive input. The experimental results indicate that the prototype performs robust soft switching over the entire load range, from no load to 320 W output. The voltage gain remains nearly constant, varying within +1%/-3.5%. Moreover, the measured dc–dc peak efficiency of the system reaches 91% at 170 W output, whereas the estimated peak efficiency of the class-$\Phi _{2}$ inverter attains 96.6%. The proposed magnetic structure offers compact dimensions and low loss characteristics for the megahertz inverter.

Published
2023
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36. Load-Independent Push–Pull Class E$ ^2$ Topology With Coupled Inductors for MHz-WPT Applications

Author

Huang, Xiaosheng, Yu, Zhikun, Dou, Yi, Lin, Shuyi, Ouyang, Ziwei, Andersen, Michael A. E., Huang, Xiaosheng, Yu, Zhikun, Dou, Yi, Lin, Shuyi, Ouyang, Ziwei, and Andersen, Michael A. E.

Abstract

This article investigates the modeling and implementation of the load-independent operation for the push–pull Class E topology with coupled inductors. The analytical modeling is first presented and provides a new design methodology, which distantly improves the soft-switching performance, load regulation, and efficiency compared with the conventional inductor-coupled Class E topology. An LCC-S resonant Class E$ ^2$ converter, which combines the load-independent inductor-coupled inverter and active rectifier, is proposed for MHz-wireless power transfer (MHz-WPT) applications. The active inductor-coupled Class E rectifier maintains soft switching, constant voltage gain, and zero-phase-angle input at various loads. A three-winding magnetic structure is also proposed to improve the coupled inductors by enhanced self-inductance, which features more effective harmonic suppression with lower magnetic losses and volumes. By the proposed methodology and the improved magnetic structure, the converter features negligible harmonic contents and maintains soft switching with a constant voltage conversion ratio over the entire load range. A 6.78-MHz WPT prototype was built to verify the proposed methodology with detailed parameter design and hardware implementation. The prototype realizes load-independent zero-voltage switching and maintains an approximately constant voltage gain with +5/$-$4% variance from no-load to 320-W output power. The measured dc–dc efficiency reaches 89.3% at 210 W.

Published
2022

45. Just-in-Time CSR for Urgent Needs during the COVID-19 Outbreak: The Case of Casinos.

Author

Lin, Zhiwei, Wong, IpKin Anthony, and Lin, Shuyi Kara

Subjects
SOCIAL responsibility of business, COVID-19 pandemic, CASINOS, COMMUNITIES, GAMBLING
Abstract

Copyright of Journal of China Tourism Research is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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48. Synchronous Push-Pull Class E Rectifiers with Load-Independent Operation for Megahertz Wireless Power Transfer

Author

Huang, Xiaosheng, Dou, Yi, Lin, Shuyi, Tian, Yuan, Ouyang, Ziwei, Andersen, Michael A. E., Huang, Xiaosheng, Dou, Yi, Lin, Shuyi, Tian, Yuan, Ouyang, Ziwei, and Andersen, Michael A. E.

Abstract

This paper presents the analytical modeling of synchronous class E rectifiers with the load-independent operation, which achieves zero-phase-angle input impedance, soft-switching over the entire load range with a constant voltage gain. The optimal design of the synchronous class E rectifier is proposed to realize both of zero-voltage-switching turn-on and zero-current-switching turn-off at the expected output power. An LCC-S compensated MHz-WPT topology, which comprises the push-pull class E inverter and rectifier with the load-independent operation, is proposed to achieve the fully soft-switching and a nearly-constant voltage gain over the entire load range. The efficiency improvement of the compensation network is also investigated to provide a design methodology for the proposed topology. A 6.78-MHz WPT prototype, along with an alternative phase detector using an auxiliary coil to realize phase detection, is built to validate the analytical model and the proposed methodology. The system efficiency reaches 86.7 % at 214 watts output. The synchronous push-pull class E rectifier maintains soft-switching over the load range, and the rectification efficiency reaches 94.6 %.

Published
2021

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