Search

Your search keyword '"Liu, Yulu"' showing total 546 results
Start Over Author "Liu, Yulu"
546 results on '"Liu, Yulu"'

1. EEG-SCMM: Soft Contrastive Masked Modeling for Cross-Corpus EEG-Based Emotion Recognition

Author

Liu, Qile, Ye, Weishan, Liu, Yulu, and Liang, Zhen

Subjects
Computer Science - Human-Computer Interaction, Computer Science - Artificial Intelligence
Abstract

Emotion recognition using electroencephalography (EEG) signals has garnered widespread attention in recent years. However, existing studies have struggled to develop a sufficiently generalized model suitable for different datasets without re-training (cross-corpus). This difficulty arises because distribution differences across datasets far exceed the intra-dataset variability. To solve this problem, we propose a novel Soft Contrastive Masked Modeling (SCMM) framework. Inspired by emotional continuity, SCMM integrates soft contrastive learning with a new hybrid masking strategy to effectively mine the "short-term continuity" characteristics inherent in human emotions. During the self-supervised learning process, soft weights are assigned to sample pairs, enabling adaptive learning of similarity relationships across samples. Furthermore, we introduce an aggregator that weightedly aggregates complementary information from multiple close samples based on pairwise similarities among samples to enhance fine-grained feature representation, which is then used for original sample reconstruction. Extensive experiments on the SEED, SEED-IV and DEAP datasets show that SCMM achieves state-of-the-art (SOTA) performance, outperforming the second-best method by an average accuracy of 4.26% under two types of cross-corpus conditions (same-class and different-class) for EEG-based emotion recognition., Comment: 16 pages, 8 figures, 15 tables, submitted to AAAI 2025

Published
2024

24. Auditory Discrimination Elicited by Nonspeech and Speech Stimuli in Children with Congenital Hearing Loss

Author

Yang, Ying, Li, Qiong, Xiao, Yanan, Liu, Yulu, Sun, Kangning, Li, Bo, and Zheng, Qingyin

Abstract

Purpose: Congenital deafness not only delays auditory development but also hampers the ability to perceive nonspeech and speech signals. This study aimed to use auditory event-related potentials to explore the mismatch negativity (MMN), P3a, negative wave (Nc), and late discriminative negativity (LDN) components in children with and without hearing loss. Method: Nineteen children with normal hearing (CNH) and 17 children with hearing loss (CHL) participated in this study. Two sets of pure tones (1 kHz vs. 1.1 kHz) and lexical tones (/ba2/ vs. /ba4/) were used to examine the auditory discrimination process. Results: MMN could be elicited by the pure tone and the lexical tone in both groups. The MMN latency elicited by nonspeech and speech was later in CHL than in CNH. Additionally, the MMN latency induced by speech occurred later in the left than in the right hemisphere in CNH, and the MMN amplitude elicited by speech in CHL produced a discriminative deficiency compared with that in CNH. Although the P3a latency and amplitude elicited by nonspeech in CHL and CNH were not significantly different, the Nc amplitude elicited by speech performed much lower in CHL than in CNH. Furthermore, the LDN latency elicited by nonspeech was later in CHL than in CNH, and the LDN amplitude induced by speech showed higher dominance in the right hemisphere in both CNH and CHL. Conclusion: By incorporating nonspeech and speech auditory conditions, we propose using MMN, Nc, and LDN as potential indices to investigate auditory perception, memory, and discrimination.

Published
2022
Full Text
View/download PDF

27. Gate-Tunable Transport in Quasi-One-Dimensional α‑Bi4I4 Field Effect Transistors

Author

Liu, Yulu, Chen, Ruoyu, Zhang, Zheneng, Bockrath, Marc, Lau, Chun Ning, Zhou, Yan-Feng, Yoon, Chiho, Li, Sheng, Liu, Xiaoyuan, Dhale, Nikhil, Lv, Bing, Zhang, Fan, Watanabe, Kenji, Taniguchi, Takashi, Huang, Jianwei, Yi, Ming, Oh, Ji Seop, and Birgeneau, Robert J

Subjects
Physical Sciences, Condensed Matter Physics, quasi-1D topological insulator, Bi4X4, Josephson transistor, topological superconductivity, Nanoscience & Nanotechnology
Abstract

Bi4I4 belongs to a novel family of quasi-one-dimensional (1D) topological insulators (TIs). While its β phase was demonstrated to be a prototypical weak TI, the α phase, long thought to be a trivial insulator, was recently predicted to be a rare higher order TI. Here, we report the first gate tunable transport together with evidence for unconventional band topology in exfoliated α-Bi4I4 field effect transistors. We observe a Dirac-like longitudinal resistance peak and a sign change in the Hall resistance; their temperature dependences suggest competing transport mechanisms: a hole-doped insulating bulk and one or more gate-tunable ambipolar boundary channels. Our combined transport, photoemission, and theoretical results indicate that the gate-tunable channels likely arise from novel gapped side surface states, two-dimensional (2D) TI in the bottommost layer, and/or helical hinge states of the upper layers. Markedly, a gate-tunable supercurrent is observed in an α-Bi4I4 Josephson junction, underscoring the potential of these boundary channels to mediate topological superconductivity.

Published
2022

28. The Influence of Suggestibility of Brand Names of Agricultural Products on Consumption Decision-Making: A Case Study of Names with Taste Suggestibility

Author

Zeng, Ruoxun, Li, Xue, Liu, Yulu, Meng, Zixin, Xu, Jialin, Appolloni, Andrea, Series Editor, Caracciolo, Francesco, Series Editor, Ding, Zhuoqi, Series Editor, Gogas, Periklis, Series Editor, Huang, Gordon, Series Editor, Nartea, Gilbert, Series Editor, Ngo, Thanh, Series Editor, Striełkowski, Wadim, Series Editor, Vilas, Gaikar, editor, Gao, Jing, editor, and Chen, Xi, editor

Published
2023
Full Text
View/download PDF

29. A Review of Survival Analysis Theory and Its Application

Author

Liu, Yulu, Striełkowski, Wadim, Editor-in-Chief, Black, Jessica M., Series Editor, Butterfield, Stephen A., Series Editor, Chang, Chi-Cheng, Series Editor, Cheng, Jiuqing, Series Editor, Dumanig, Francisco Perlas, Series Editor, Al-Mabuk, Radhi, Series Editor, Scheper-Hughes, Nancy, Series Editor, Urban, Mathias, Series Editor, Webb, Stephen, Series Editor, M. Dom, Mohd Fauzi bin Sedon, editor, Zabielskis, Peter Thomas, editor, Liu, Xudong, editor, and Liu, Xiao, editor

Published
2023
Full Text
View/download PDF

32. Risk stratification for 1- to 2-cm gastric gastrointestinal stromal tumors: visual assessment of CT and EUS high-risk features versus CT radiomics analysis

Author

Jia, Xiaoxuan, Wan, Lijuan, Chen, Xiaoshan, Ji, Wanying, Huang, Shaoqing, Qi, Yuangang, Cui, Jingjing, Wei, Shengcai, Cheng, Jin, Chai, Fan, Feng, Caizhen, Liu, Yulu, Zhang, Hongmei, Sun, Yingshi, Hong, Nan, Rao, Shengxiang, Zhang, Xinhua, Xiao, Youping, Ye, Yingjiang, Tang, Lei, and Wang, Yi

Published
2023
Full Text
View/download PDF

41. Spatial statistics of atmospheric particulate matter in China

Author

Gao, Shenghui, Wang, Yangjun, Huang, Yongxiang, Zhou, Quan, Lu, Zhiming, Shi, Xiang, and Liu, Yulu

Subjects
Physics - Atmospheric and Oceanic Physics
Abstract

In this paper, the spatial dynamics of the atmospheric particulate matters (resp. PM$_{10}$ and PM$_{2.5}$) are studied using turbulence methodologies. It is found experimentally that the spatial correlation function $\rho(r)$ shows a log-law on the mesoscale range, i.e., $50\le r\le 500\,{km}$, with an experimental scaling exponent $\beta=0.45$. The spatial structure function shows a power-law behavior on the mesoscale range $90\le r\le 500\,{km}$. The experimental scaling exponent $\zeta(q)$ is convex, showing that the intermittent correction is relevant in characterizing the spatial dynamic of particulate matter. The measured singularity spectrum $f(\alpha)$ also shows its multifractal nature. Experimentally, the particulate matter is more intermittent than the passive scalar, which could be partially due to the \red{mesoscale movements} of the atmosphere, and also due to local sources, such as local industry activities., Comment: 17 pages with 8 figures

Published
2018
Full Text
View/download PDF

42. Extremal-point density of scaling processes from fractal Brownian motion to turbulence in one dimension

Author

Huang, Yongxiang, Wang, Lipo, Schmitt, F. G., Zheng, Xiaobo, Jiang, Nan, and Liu, Yulu

Subjects
Condensed Matter - Statistical Mechanics, Physics - Fluid Dynamics
Abstract

In recent years several local extrema based methodologies have been proposed to investigate either the nonlinear or the nonstationary time series for scaling analysis. In the present work we study systematically the distribution of the local extrema for both synthesized scaling processes and turbulent velocity data from experiments. The results show that for the fractional Brownian motion (fBm) without intermittency correction the measured extremal point density (EPD) agrees well with a theoretical prediction. For a multifractal random walk (MRW) with the lognormal statistics, the measured EPD is independent with the intermittency parameter $\mu$, suggesting that the intermittency correction does not change the distribution of extremal points, but change the amplitude. By introducing a coarse-grained operator, the power-law behavior of these scaling processes is then revealed via the measured EPD for different scales. For fBm the scaling exponent $\xi(H)$ is found to be $\xi(H)=H$, where $H$ is Hurst number, while for MRW $\xi(H)$ shows a linear relation with the intermittency parameter $\mu$. Such EPD approach is further applied to the turbulent velocity data obtained from a wind tunnel flow experiment with the Taylor scale $\lambda$ based Reynolds number $Re_{\lambda}= 720$, and a turbulent boundary layer with the momentum thickness $\theta$ based Reynolds number $Re_{\theta}= 810$. A scaling exponent $\xi\simeq 0.37$ is retrieved for the former case. For the latter one, the measured EPD shows clearly four regimes, which agree well with the four regimes of the turbulent boundary layer structures., Comment: 26 pages with 19 figures

Published
2018
Full Text
View/download PDF

43. Taylor dispersion in two-dimensional bacterial turbulence

Author

Huang, Yongxiang, Yu, Ouwen, Chen, Ming, Lu, Zhiming, Jiang, Nan, Liu, Yulu, Qiu, Xiang, and Zhou, Quan

Subjects
Physics - Fluid Dynamics, Condensed Matter - Soft Condensed Matter, Physics - Biological Physics
Abstract

In this work, single particle dispersion was analyzed for a bacterial turbulence by retrieving the virtual Lagrangian trajectory via numerical integration of the Lagrangian equation. High-order displacement functions were calculated for cases with and without mean velocity effect. Two-regime power-law behavior for short and long time evolutions were identified experimentally, which were separated by the Lagrangian integral time. For the case with the mean velocity effect, the experimental Hurst numbers were determined to be $0.94$ and $0.97$ for short and long times evolutions, respectively. For the case without the mean velocity effect, the values were $0.88$ and $0.58$. Moreover, very weak intermittency correction was detected. All measured Hurst number were above $1/2$, the value of the normal diffusion, which verifies the super-diffusion behavior of living fluid. This behavior increases the efficiency of bacteria to obtain food., Comment: 20 pages with 13 figures

Published
2018
Full Text
View/download PDF

50. The wake characteristics and hydrodynamic forces of a near-wall circular cylinder with the splitter plate.

Author

Liu, Yulu, Li, Yubing, Li, Jianghua, Zhou, Jiankang, and Qiu, Xiang

Subjects
*DRAG coefficient, *DRAG reduction, *REYNOLDS number, *SHEAR walls, *DIAMETER
Abstract

Flow around a near-wall circular cylinder with the splitter plate is numerically performed at Reynolds number of 500, with the objective of investigating the wake characteristics and hydrodynamic forces. Five gap ratios G ∕ D = 0. 1 , 0. 3 , 0. 5 , 0. 7 and 0. 9 (G is the gap between the lower surface of the cylinder and the wall, D is the diameter of the cylinder) are selected, and the splitter plate length L ∕ D ranges from 0 to 4. 5. The flow characteristics of an isolated cylinder with the splitter plate are investigated first for comparison, and four wake flow modes are observed, which include 2S mode (L ∕ D ≤ 0. 1 5), P+S mode (0. 3 ≤ L ∕ D ≤ 1. 0), 2S+S mode (1. 2 5 ≤ L ∕ D ≤ 2. 0) and 2P mode (L ∕ D ≥ 3. 0). As L ∕ D increases from 0 to 0. 7 5 , the mean drag coefficient ( C D ¯) is decreased, and there is a slight increase of C D ¯ for 0. 7 5 < L ∕ D ≤ 1. 2 5. In addition, the cases of L ∕ D = 0. 7 5 and L ∕ D = 1. 0 produce a very significant reduction of drag, and the C D ¯ is reduced by as much as 3 9 % and 3 8 % , respectively. The wake characteristics and hydrodynamic forces of a near-wall cylinder with the splitter plate are investigated in detail, and five wake regimes are observed, which include the wake vortex merging regime I, merged vortex attaching regime II, steady flow regime III, wall shear layer elongation regime IV and upper shear layer attaching regime V. For G ∕ D = 0. 1 , the wake vortex shedding is suppressed. For G ∕ D ≥ 0. 3 , the Strouhal number (St) is decreased as L ∕ D increases from 0 to 1.0, and there is an increase of St at L ∕ D = 1. 2 5. At L ∕ D ≥ 1. 2 5 , the St of the near-wall cylinder is larger than that of the isolated cylinder, and the increase in St is affected by the deflected gap flow. What is more, the hydrodynamic characteristics are affected by the wall. For G ∕ D > 0. 1 , the variations of C D ¯ with L ∕ D are similar to that of the isolated cylinder. It is found that the cases of L ∕ D = 0. 7 5 and L ∕ D = 1. 0 still produce a significant reduction of drag for G ∕ D > 0. 3 , and the C D ¯ is increased for all cases of L ∕ D as G ∕ D increases. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results