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1,188 results on '"Li, Shuwei"'

1. Observation of Co-propagating Chiral Zero Modes in Magnetic Photonic Crystals

Author

Li, Zhongfu, Ma, Shaojie, Li, Shuwei, you, Oubo, Liu, Yachao, Yang, Qingdong, Xiang, Yuanjiang, Zhou, Peiheng, and Zhang, Shuang

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Optics
Abstract

Topological singularities, such as Weyl points and Dirac points, can give rise to unidirectional propagation channels known as chiral zero modes (CZMs) when subject to a magnetic field. These CZMs are responsible for intriguing phenomena like the chiral anomaly in quantum systems. The propagation direction of each CZM is determined by both the applied magnetic field and the topological charge of the singularity point. While counter-propagating CZMs have been observed in 2D and 3D systems, the realization of co-propagating CZMs has remained elusive. Here we present the first experimental observation of co-propagating CZMs in magnetic photonic crystals hosting a single pair of ideal Weyl points WPs. By manipulating the crystal's structural configuration, we spatially alter the locations of the WPs, creating pseudo-magnetic fields in opposite directions between them. This arrangement results in a pair of CZMs that possess the same group velocity and co-propagate. Our work opens up new possibilities for topological manipulation of wave propagation and may lead to advancements in optical waveguides, switches, and various other applications., Comment: 6 pages, 5 figures

Published
2024

5. NFT.mine: An xDeepFM-based Recommender System for Non-fungible Token (NFT) Buyers

Author

Li, Shuwei, Jin, Yucheng, Hsu, Pin-Lun, and Luo, Ya-Sin

Subjects
Computer Science - Cryptography and Security
Abstract

Non-fungible token (NFT) is a tradable unit of data stored on the blockchain which can be associated with some digital asset as a certification of ownership. The past several years have witnessed the exponential growth of the NFT market. In 2021, the NFT market reached its peak with more than $40 billion trades. Despite the booming NFT market, most NFT-related studies focus on its technical aspect, such as standards, protocols, and security, while our study aims at developing a pioneering recommender system for NFT buyers. In this paper, we introduce an extreme deep factorization machine (xDeepFM)-based recommender system, NFT.mine, which achieves real-time data collection, data cleaning, feature extraction, training, and inference. We used data from OpenSea, the most influential NFT trading platform, to testify the performance of NFT.mine. As a result, experiments showed that compared to traditional models such as logistic regression, naive Bayes, random forest, etc., NFT.mine outperforms them with higher AUC and lower cross entropy loss and outputs personalized recommendations for NFT buyers., Comment: 6 pages, 8 figures, 2 tables

Published
2023

9. Realization of a quadrupole topological insulator phase in a gyromagnetic photonic crystal

Author

Zhou, Peiheng, Liu, Gui-Geng, Wang, Zihao, Hu, Yuan-Hang, Li, Shuwei, Xie, Qindong, Zhang, Yunpeng, Xi, Xiang, Gao, Zhen, Deng, Longjiang, and Zhang, Baile

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

The field of topological photonics was initiated with the realization of a Chern insulator phase in a gyromagnetic photonic crystal (PhC) with broken time-reversal symmetry (T), hosting chiral edge states that are topologically protected propagating modes. Recent advances in higher-order band topology have discovered another type of topological state, as manifested by those modes localized at the corners of a sample, which are known as corner states. Here we report the realization of a quadrupole higher-order topological insulator phase in a gyromagnetic PhC, induced by a topological phase transition from the previously demonstrated Chern insulator phase. The evolution of the boundary modes from propagating chiral edge states to localized corner states has been characterized by microwave measurements. We also demonstrate topological bound states in the continuum, when the gyromagnetic PhC is magnetically tuned. These results extend the quadrupole topological insulator phase into T-broken systems, and integrate topologically protected propagating and localized modes in the same platform., Comment: 7 pages,4 figures

Published
2023

10. MIMT: Multi-Illuminant Color Constancy via Multi-Task Local Surface and Light Color Learning

Author

Li, Shuwei, Wang, Jikai, Brown, Michael S., and Tan, Robby T.

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

The assumption of a uniform light color distribution is no longer applicable in scenes that have multiple light colors. Most color constancy methods are designed to deal with a single light color, and thus are erroneous when applied to multiple light colors. The spatial variability in multiple light colors causes the color constancy problem to be more challenging and requires the extraction of local surface/light information. Motivated by this, we introduce a multi-task learning method to discount multiple light colors in a single input image. To have better cues of the local surface/light colors under multiple light color conditions, we design a novel multi-task learning framework. Our framework includes auxiliary tasks of achromatic-pixel detection and surface-color similarity prediction, providing better cues for local light and surface colors, respectively. Moreover, to ensure that our model maintains the constancy of surface colors regardless of the variations of light colors, a novel local surface color feature preservation scheme is developed. We demonstrate that our model achieves 47.1% improvement (from 4.69 mean angular error to 2.48) compared to a state-of-the-art multi-illuminant color constancy method on a multi-illuminant dataset (LSMI)., Comment: 8 pages, 6 figures

Published
2022

11. Correlation analysis between hypertension，abnormal blood glucose and lipid metabolism and the site and frequency of gout attack

Author

Li Shuwei, Zhu Yong, Lu Xueling

Subjects
gout, attack site, hypertension, hyperglycemia, hyperlipidemia, metabolism, Medicine
Abstract

Objective To analyze the correlation between hypertension，abnormal blood glucose and lipid metabolism and the site and frequency of gout attack. Methods Clinical data of 84 primary gout patients were collected. Gender，age，height，body weight，body mass index （BMI），complicated diseases，site and frequency of gout attack were recorded. The differences of clinical parameters at different sites of gout attack were compared. The differences of frequency of gout attack in patients complicated with diabetes mellitus，hypertension and hyperlipidemia at different time points were also compared. The relationship between age and BMI，and frequency of gout attack was assessed by Spearman’s rank correlation analysis. Results Among 84 patients with primary gout，82 patients were male and 2 female，aged （37.95±10.16） years on average，with a mean height of 170 （165，175） cm，mean weight of 76 （70，83） kg，mean BMI of 26.5 （24.6，29.3） kg/m2. Among them，7 patients （8%） were complicated with diabetes mellitus，18 cases （21%） of hypertension and 16 cases （19%） of hyperlipidemia. the most common site of gout attack was the lower limb，especially the metatarsophalangeal joint （38.10%） and knee joint （35.71%）. The frequency of gout attack within 1，6 and 12 months in gout patients complicated with hypertension was higher compared with that in those without hypertension （all P<0.05）. The frequency of gout attack in gout patients complicated with hypertension was increased over time （all P < 0.05/6 between any two consecutive time points）. BMI of gout patients was positively correlated with 1-year cumulative frequency of gout attack （rs=0.28，P<0.05）. Conclusions The frequency of gout attack in patients complicated with hypertension is higher compared with that of their counterparts without hypertension. The frequency of gout attack is increased over time. Extensive attention should be diverted to blood pressure and BMI in gout patients，thereby reducing the frequency of gout attack.

Published
2024
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23. Biofilm matrix and artificial mediator for efficient electron transport in CO2 microbial electrosynthesis

Author

Song, Young Eun, Mohamed, Abdelrhman, Kim, Changman, Kim, Minsoo, Li, Shuwei, Sundstrom, Eric, Beyenal, Haluk, and Kim, Jung Rae

Subjects
MicrobialCO2 electrosynthesis, Electron mediator, Bioelectrochemical system, Biofilms, Planktonic cell, HNQ, Chemical Engineering, Civil Engineering, Environmental Engineering
Abstract

Microbial electrosynthesis (MES) has been highlighted as a means to valorize inorganic gaseous carbon, such as CO2, into value-added chemicals using electricity as the reducing power. Electrode-based electron transfer delivers respiratory electrons to a live-cell biocatalyst through a biofilm matrix or via electron shuttle molecules. The addition of artificial mediators, such as neutral red (NR) and 2-hydroxy-1,4-naphthoquinone (HNQ), increased acetate synthesis significantly, suggesting that these mediators improve the electron transport capability between the suspended cells and electrode. Regular media replacement also improves MES by adapting mediator-utilizing species in the reactor. MES without a mediator initially produced acetate at a reasonable rate (5.1 ± 0.2 mmol/l/day), but the rate became negligible in the later stage. In contrast, MES with NR or HNQ showed a higher acetate production rate (4.6 ± 0.4 vs. 7.4 ± 0.4 mmol/l/day, respectively) as the media replacement progressed. Confocal laser scanning microscopy and 3D imaging showed that the biofilm matrix consisted of live and dead cells, while the composition was different in the MES with and without a mediator. Microbial community analysis by next-generation sequencing (NGS) showed that acetogenic Acetobacterium (in suspension) and Sporomusa (in both suspension and biofilm) were dominant during the 96 days of operation. The biofilm and planktonic community interacted dynamically under MES conditions. This result provides a realistic model of biofilms and planktonic cells in the MES. The interaction of the suspended cells with the biofilm-forming electrode via electron shuttles could improve volumetric acetate production and stabilize the MES performance.

Published
2022

34. Comprehensive epigenomic profiling reveals the extent of disease-specific chromatin states and informs target discovery in ankylosing spondylitis

Author

Brown, Andrew C., Cohen, Carla J., Mielczarek, Olga, Migliorini, Gabriele, Costantino, Félicie, Allcock, Alice, Davidson, Connor, Elliott, Katherine S., Fang, Hai, Lledó Lara, Alicia, Martin, Alice C., Osgood, Julie A., Sanniti, Anna, Scozzafava, Giuseppe, Vecellio, Matteo, Zhang, Ping, Black, Mary Helen, Li, Shuwei, Truong, Dongnhu, Molineros, Julio, Howe, Trevor, Wordsworth, B. Paul, Bowness, Paul, and Knight, Julian C.

Published
2023
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