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1,367 results on '"Xie, Xiaoyan"'

1. Joint Optimization of Buffer Delay and HARQ for Video Communications

Author

Cheng, Baoping, Lei, Peng, Xie, Xiaoyan, Fu, Tao, Zhang, Yukun, and Tao, Xiaoming

Subjects
Computer Science - Multimedia
Abstract

To improve the quality of experience (QoE) in video communication over lossy networks, this paper presents a transmission method that jointly optimizes buffer delay and Hybrid Automatic Repeat request (HARQ), referred to as BD-HARQ. This method operates on packet group and employs dynamic buffer delay combined with HARQ strategy for transmission. By defining the QoE based on metrics such as buffer delay, Forward Error Correction (FEC) redundancy, and data recovery rate, the proposed method derives its closed-form expression through rigorous mathematical modeling and analysis. The optimal transmission parameters, i.e., the buffer delay and the FEC redundancy, are then determined and implemented, guaranteeing the real-time performance, transmission efficiency, and data recovery rate of video communication. Experimental results demonstrate that the proposed method aligns well with its theoretical expectations, and that it can provide up to 13.7% higher QoE compared to existing methods and increase the tolerance for packet loss rate from 15%-22% to up to 31% while maintaining a high QoE., Comment: 6 pages, 5figures

Published
2024

2. Methodological Explainability Evaluation of an Interpretable Deep Learning Model for Post-Hepatectomy Liver Failure Prediction Incorporating Counterfactual Explanations and Layerwise Relevance Propagation: A Prospective In Silico Trial

Author

Zhong, Xian, Salahuddin, Zohaib, Chen, Yi, Woodruff, Henry C, Long, Haiyi, Peng, Jianyun, Udawatte, Nuwan, Casale, Roberto, Mokhtari, Ayoub, Zhang, Xiaoer, Huang, Jiayao, Wu, Qingyu, Tan, Li, Chen, Lili, Li, Dongming, Xie, Xiaoyan, Lin, Manxia, and Lambin, Philippe

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Artificial intelligence (AI)-based decision support systems have demonstrated value in predicting post-hepatectomy liver failure (PHLF) in hepatocellular carcinoma (HCC). However, they often lack transparency, and the impact of model explanations on clinicians' decisions has not been thoroughly evaluated. Building on prior research, we developed a variational autoencoder-multilayer perceptron (VAE-MLP) model for preoperative PHLF prediction. This model integrated counterfactuals and layerwise relevance propagation (LRP) to provide insights into its decision-making mechanism. Additionally, we proposed a methodological framework for evaluating the explainability of AI systems. This framework includes qualitative and quantitative assessments of explanations against recognized biomarkers, usability evaluations, and an in silico clinical trial. Our evaluations demonstrated that the model's explanation correlated with established biomarkers and exhibited high usability at both the case and system levels. Furthermore, results from the three-track in silico clinical trial showed that clinicians' prediction accuracy and confidence increased when AI explanations were provided.

Published
2024

7. The clinical significance and prognostic value of serum beta-2 microglobulin in adult lymphoma-associated hemophagocytic lymphohistiocytosis: a multicenter analysis of 326 patients

Author

Jin, Ze, Miao, Yi, Zhang, Jie, Zhang, Jing, Wang, Chunling, Lu, Xuzhang, Miao, Yuqing, Sun, Miao, Zhang, Yunping, Zhuang, Yun, Ni, Haiwen, Xu, Jingyan, Zhuang, Wanchuan, Zhao, Min, Zhu, Jianfeng, Xu, Min, Lin, Guoqiang, Hua, Haiying, Xie, Xiaoyan, Xu, Maozhong, Jia, Tao, Zhai, Lijia, Gu, Weiying, Shan, Qiurong, Wang, Zhi, Shen, Qiudan, Zhang, Xiaohui, Li, Jianyong, and Shi, Wenyu

Published
2024
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17. Non-thermal Broadening of IRIS Fe XXI Lines Caused by Turbulent Plasma Flows in the Magnetic Reconnection Region During Solar Eruptions

Author

Shen, Chengcai, Polito, Vanessa, Reeves, Katharine K., Chen, Bin, Yu, Sijie, and Xie, Xiaoyan

Subjects
Astrophysics - Solar and Stellar Astrophysics, Physics - Plasma Physics
Abstract

Magnetic reconnection is the key mechanism for energy release in solar eruptions, where the high-temperature emission is the primary diagnostic for investigating the plasma properties during the reconnection process. Non-thermal broadening of high-temperature lines has been observed in both the reconnection current sheet (CS) and flare loop-top regions by UV spectrometers, but its origin remains unclear. In this work, we use a recently developed three-dimensional magnetohydrodynamic (MHD) simulation to model magnetic reconnection in the standard solar flare geometry and reveal highly dynamic plasma flows in the reconnection regions. We calculate the synthetic profiles of the Fe XXI 1354 \AA~line observed by the Interface Region Imaging Spectrograph (IRIS) spacecraft by using parameters of the MHD model, including plasma density, temperature, and velocity. Our model shows that the turbulent bulk plasma flows in the CS and flare loop-top regions are responsible for the non-thermal broadening of the Fe XXI emission line. The modeled non-thermal velocity ranges from tens of km s$^{-1}$ to more than two hundred km s$^{-1}$, which is consistent with the IRIS observations. Simulated 2D spectral line maps around the reconnection region also reveal highly dynamic downwflow structures where the high non-thermal velocity is large, which is consistent with the observations as well.

Published
2022

24. Analysis of Sonazoid contrast-enhanced ultrasound for predicting the risk of microvascular invasion in hepatocellular carcinoma: a prospective multicenter study

Author

Yao, Jundong, Li, Kaiyan, Yang, Hong, Lu, Shichun, Ding, Hong, Luo, Yan, Li, Kai, Xie, Xiaoyan, Wu, Wei, Jing, Xiang, Liu, Fangyi, Yu, Jie, Cheng, Zhigang, Tan, Shuilian, Dou, Jianping, Dong, XueJuan, Wang, Shuo, Zhang, Yiqiong, Li, Yunlin, Qi, Erpeng, Han, Zhiyu, Liang, Ping, and Yu, XiaoLing

Published
2023
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27. The Origin of Underdense Plasma Downflows Associated with Magnetic Reconnection in Solar Flares

Author

Shen, Chengcai, Chen, Bin, Reeves, Katharine K., Yu, Sijie, Polito, Vanessa, and Xie, Xiaoyan

Subjects
Astrophysics - Solar and Stellar Astrophysics, Physics - Plasma Physics, Physics - Space Physics
Abstract

Magnetic reconnection is a universal process that powers explosive energy release events such as solar flares, geomagnetic substorms, and some astrophysical jets. A characteristic feature of magnetic reconnection is the production of fast reconnection outflow jets near the plasma Alfv\'{e}n speeds. In eruptive solar flares, dark, finger-shaped plasma downflows moving toward the flare arcade have been commonly regarded as the principal observational evidence for such reconnection-driven outflows. However, they often show a speed much slower than that expected in reconnection theories, challenging the reconnection-driven energy release scenario in standard flare models. Here, we present a three-dimensional magnetohydrodynamics model of solar flares. By comparing the model-predictions with the observed plasma downflow features, we conclude that these dark downflows are self-organized structures formed in a turbulent interface region below the flare termination shock where the outflows meet the flare arcade, a phenomenon analogous to the formation of similar structures in supernova remnants. This interface region hosts a myriad of turbulent flows, electron currents, and shocks, crucial for flare energy release and particle acceleration.

Published
2021
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48. Safety findings after intravenous administration of sulfur hexafluoride microbubbles to 463,434 examinations at 24 centers

Author

Shang, Yongning, Xie, Xiaoyan, Luo, Yan, Nie, Fang, Luo, Yukun, Jing, Xiang, Liao, Jintang, Zheng, Rongqin, Wu, Rong, Luo, Xiaomao, Chen, Zhiyi, Xu, Youfeng, Zhang, Ruifang, Wang, Hui, Yuan, Jianjun, Zhang, Hongxia, Zhu, Jiaan, Zhang, Wei, Ruan, Litao, Yang, Min, Li, Zhiyan, Luo, Hong, Chen, Qin, Yan, Jiping, Tang, Chunlin, Liu, Deng, Fang, Kejing, Guo, Yanli, and He, Wen

Published
2023
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