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Your search keyword '"Pan, Jianfei"' showing total 222 results
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222 results on '"Pan, Jianfei"'

1. SkyMath: Technical Report

Author

Yang, Liu, Yang, Haihua, Cheng, Wenjun, Lin, Lei, Li, Chenxia, Chen, Yifu, Liu, Lunan, Pan, Jianfei, Wei, Tianwen, Li, Biye, Zhao, Liang, Wang, Lijie, Zhu, Bo, Li, Guoliang, Wu, Xuejie, Luo, Xilin, and Hu, Rui

Subjects
Computer Science - Computation and Language, Computer Science - Artificial Intelligence
Abstract

Large language models (LLMs) have shown great potential to solve varieties of natural language processing (NLP) tasks, including mathematical reasoning. In this work, we present SkyMath, a large language model for mathematics with 13 billion parameters. By applying self-compare fine-tuning, we have enhanced mathematical reasoning abilities of Skywork-13B-Base remarkably. On GSM8K, SkyMath outperforms all known open-source models of similar size and has established a new SOTA performance.

Published
2023

8. DNA methylation-based profiling of horse archaeological remains for age-at-death and castration

Author

Liu, Xuexue, Seguin-Orlando, Andaine, Chauvey, Lorelei, Tressières, Gaëtan, Schiavinato, Stéphanie, Tonasso-Calvière, Laure, Aury, Jean-Marc, Perdereau, Aude, Wagner, Stefanie, Clavel, Pierre, Estrada, Oscar, Pan, Jianfei, Ma, Yuehui, Enk, Jacob, Devault, Alison, Klunk, Jennifer, Lepetz, Sébastien, Clavel, Benoit, Jiang, Lin, Wincker, Patrick, Collin, Yvette Running Horse, Sarkissian, Clio Der, and Orlando, Ludovic

Published
2023
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11. Robust Speed Control of Permanent Magnet Synchronous Motor Drive System Using Sliding-Mode Disturbance Observer-Based Variable-Gain Fractional-Order Super-Twisting Sliding-Mode Control.

Author

Ullah, Ameen, Pan, Jianfei, Ullah, Safeer, and Zhang, Zhang

Subjects
*PERMANENT magnet motors, *ROBUST control, *SPEED
Abstract

This paper proposes a novel nonlinear speed control method for permanent magnet synchronous motors that enhances their robustness and tracking performance. This technique integrates a sliding-mode disturbance observer and variable-gain fractional-order super-twisting sliding-mode control within a vector-control framework. The proposed control scheme employs a sliding-mode control method to mitigate chattering and improve dynamics by implementing fractional-order theory with a variable-gain super-twisting sliding manifold design while regulating the speed of the considered motor system. The aforementioned observer is suggested to enhance the control accuracy by estimating and compensating for the lumped disturbances. The proposed methodology demonstrates its superiority over other control schemes such as traditional sliding-mode control, super-twisting sliding-mode control, and the proposed technique. MATLAB/Simulink simulations and real-time implementation validate its performance, showing its potential as a reliable and efficient control approach for the system under study in practical applications. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Automatic Detection and Self-Adjustment Compensation for Mechanical Oscillations and Disturbances in Servo Systems

Author

Wang, Can, Wang, Tian, Chen, Guan, and Pan, Jianfei

Abstract

In order to simultaneously achieve mechanical oscillation suppression and anti-disturbance of the servo system without manual adjustment, this article proposes a complete scheme based on integrated absolute error (IAE) self-detection and state feedback-based self-adjustment. First, a control structure with positive and negative state feedbacks is constructed. Then, an IAE-based detection method for mechanical oscillations and disturbances is proposed according to the real-time motor speed response characteristic. The effect of different feedback coefficients on system performance is investigated, which can verify the effectiveness of the detection strategy and provide guidance for developing self-adjustment rules. Since in the state feedback structure, the suppression of oscillation is a negative feedback to the transmission torque, while the anti-disturbance is a positive feedback to the load torque, this article proposes a strategy for online automatic adjustment of compensation coefficients based on real-time detection results to effectively balance this contradiction. Simulations and experiments show that the proposed algorithm can automatically detect, autonomously judge and adjust the oscillations and disturbances of the servo system without any human intervention.

Published
2024
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21. An SMC-Based Accurate and Robust Load Speed Control Method for Elastic Servo System

Author

Wang, Can, Liu, Fangfang, Xu, Jiachen, and Pan, Jianfei

Abstract

In this article, a modified sliding mode speed controller is designed in order to improve the load speed control performance of an elastic motor drive system with internal and external disturbances. First, based on the load speed deviation and its first-order and second-order differentials, a two-dimensional sliding surface function is presented. The parameters of the sliding surface are determined by a novel particle swarm optimization method. The method has improved inertia weights and evaluation functions, which can improve the accuracy and efficiency of the parameter search and enhance the immunity and robustness of the system. Second, on the basis of the integral of time-weighted absolute error criterion, the parameters of the exponential approach law are determined, which improves the tracking accuracy. Finally, the designed sliding mode control with high tracking accuracy, fast dynamics, and strong robustness is verified by both simulations and experiments.

Published
2024
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22. A High-Interoperability Optimal Frequency Control Method for the AGV Dynamic Wireless Charging Systems Without Communication

Author

Chen, Kaiwen, Ouyang, Yuzhao, Yang, Xiaodong, Cheung, Norbert Chow, Cheng, Eric Ka-Wai, and Pan, Jianfei

Abstract

In this article, a communication-free optimal frequency control method for the dynamic wireless charging system of automated guided vehicle with high interoperability is proposed. By periodically monitoring the primary winding currents, the position of the receiver (Rx) can be located in real-time, and the transmitters which are strongly coupled to the Rx will be activated for power transmission. In order to improve the system efficiency, an optimal frequency control scheme for achieving zero-phase-angle is proposed. A proportional-integral loop is employed to achieve quick elimination of the reactive power in primary side. Experimental results show that the positioning and the optimal frequency tuning can be completed within 10 ms. The out-phase can be controlled within 3.57° in the worst case, and the system transfer efficiency is increased up to 11.1%. Rxs with different shapes are utilized in experiments as case studies, and the same performance is verified. The results prove the system has high interoperability. Without any bidirectional communication and auxiliary position sensor, the system with the proposed control strategy is proven to be reliable and eco-friendly.

Published
2024
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26. Fecal Microbiota Was Reshaped in UCP1 Knock-In Pigs via the Adipose-Liver-Gut Axis and Contributed to Less Fat Deposition

Author

Pan, Jianfei, primary, Chui, Linya, additional, Liu, Tianxia, additional, Zheng, Qiantao, additional, Liu, Xuexue, additional, Liu, Lulu, additional, Zhao, Ying, additional, Zhang, Lilan, additional, Song, Min, additional, Han, Jianlin, additional, Huang, Jiaojiao, additional, Tang, Chaohua, additional, Tao, Cong, additional, Zhao, Jianguo, additional, and Wang, Yanfang, additional

Published
2023
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39. Proportional Predictive Control of Networked Linear Switched Reluctance Machine System With Time-Varying Delay

Author

Qiu, Li, Deng, Tao, Yang, Xiaomei, Najariyan, Marzieh, Pan, Jianfei, and Liu, Chengxiang

Subjects
General Materials Science
Abstract

In this article, a proportional predictive (PP) control strategy is proposed and a high-precision position tracking controller is designed for the networked linear switched reluctance machine system (NLSRMS) with time-varying delay. The closed-loop system model of the NLSRMS is constructed based on the PP control strategy. The stability conditions of the system are proposed by combining the optimal control value calculated by the cost function. The controller of the closed-loop NLSRMS is designed by using continuously updated predictive output equation information based on calculation. The comparative study of the proposed PP and PID control methods is presented by tracking several types of signals. The maximum steady errors of PP and PID control strategies are 0.2 mm and 2 mm under the sinusoidal signal, respectively. The maximum steady errors of PP and PID control strategies are 0.07 mm and 0.7 mm under the square signal, respectively. The simulation results show the effectiveness of the proposed PP control strategy.

Published
2022

40. Additional file 1 of CTRP1 prevents high fat diet-induced obesity and improves glucose homeostasis in obese and STZ-induced diabetic mice

Author

Ren, Mingzhi, Pan, Jianfei, Yu, Xueying, Chang, Kaile, Yuan, Xiaopeng, and Zhang, Chunbo

Abstract

Additional file 1: Table S1. Primer list. Table S2. Blood index. Figure S1. The map of the constructs. Figure S2. ALT, AST, and food intake in the HFD fed mice. A. ALT and AST in mice serum at the 11th week of the experiment; B. food intake; C. food intake (kcal). Figure S3. Cell viability was detected by CCK8 assay. Figure S5. Full view of H&E staining of WAT and BAT. Figure S5. Full view of H&E staining and Oil-Red O staining of liver tissue. Figure S6. ITT in wight control model on week 8. Figure S7. Glucose-stimulated insulin secretion test in vitro. Figure S8. Body weight, food intake, and fasting blood glucose in STZ-induced T2DM mice. A. The curve of body weight of STZ treated mice; B. Food intake; C. Fasting blood glucose. Figure S9. The expression of appetite related genes in the hypothalamus (A) and intestine (B). Figure S10. The expression level of upstream regulatory genes of AMPK in liver tissue.

Published
2022
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45. N, P, O co-doped carbon filling into carbon nitride microtubes to promote photocatalytic hydrogen production

Author

Yun Ling, Yipeng Zhou, Jie Zhao, Pan Jianfei, Jinsheng Zhao, Yu Xie, Liushan Jiang, and Yue Guo

Subjects
Environmental Engineering, Materials science, Band gap, chemistry.chemical_element, Electron, Pollution, Carbon, Catalysis, chemistry.chemical_compound, Chemical engineering, chemistry, Nitriles, Photocatalysis, Environmental Chemistry, Waste Management and Disposal, Carbon nitride, Visible spectrum, Hydrogen production, Hydrogen
Abstract

Carbon nitride (CN) as the photocatalytic hydrogen production catalyst has attracted great attentions but suffering from a poor performance due to the unsatisfied energy band gap and the low separation efficiency of photogenerated carriers. Herein, we create a simple method to construct a novel CN-based photocatalyst, i.e., the N, P, O co-doped carbon filled CN microtube, which presents a narrow band gap, a high separation efficiency of photogenerated carriers, and a good stability. In this novel structure, the tubular morphology of CN ensures a narrow band gap, and the N, P, O co-doped carbon facilitates the transfer of photogenerated electrons. Coupling these two further reduces the energy band gap and improves the separation efficiency. For the photocatalytic hydrogen evolution under the visible light, the optimal sample presents an ultrahigh hydrogen evolution rate of 1149.71 μmol g−1 h−1 ranking at the top level, which is 112.60 times that of traditional bulk CN. In addition, it also has a high reusability and good stability after four cycle experiments. This study has provided a new viewpoint to design or develop the high-efficient photocatalysts for hydrogen production.

Published
2021

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