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Hongfei Zhu,Congcong Liu,Haijun Song,Jingkun Xu,Fangfang Kong,Jianmin Wang 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
Poly(3-hexylthiophene) (P3HT) films doped with iodine vapor have been prepared by casting a P3HT solution on glass substrates and their thermoelectric (TE) performances has been investigated. The maximum Seebeck coefficient and electrical conductivity of iodine-doped P3HT films were 386 μV·K−1 (at room temperature) and 4.7 × 10−1 S·cm−1, which is about five orders of magnitude higher than that of pristine P3HT films. The power factor of these iodine-doped P3HT films was estimated to be 7.0 μW·m−1·K−2 at room temperature, which is a relative high value for organic TE materials. The UV-vis spectra of iodine-doped P3HT films showed a slight red shift of the iodine-doped P3HT compared to those of pristine P3HT films. Atomic force microscopy images indicated the conformational changes in P3HT chains after treatment with iodine vapor. During this treatment, the P3HT chains self-organized into a more ordered structure, this organization improved the charge carrier transport capability and the TE performance of P3HT the films.
HDWM-based Consensus Control for Multi-agent Systems Under Communication Delays and DoS Attacks
Hongfei Zhu,Jinhai Liu,Shuo Zhang,Zhigang Zhang,Fuming Qu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.12
This paper develops a novel framework with hybrid-driven waiting mechanism (HDWM) of consensus control for multi-agent systems (MASs) in the presence of communication delays and denial-of-service (DoS) attacks. Different from the existing waiting mechanism, the proposed HDWM not only involves the event-driven mechanism, but also involves the time-driven mechanism. If DoS attacks causes partial information to be lost, the information in the buffer can still be transmitted to the controller to update the states of agent via the time-driven mechanism. Meanwhile, the communication delays and DoS attacks are considered in the proposed sampled-databased resilient controller. Under the proposed HDWM and resilient controller, the MASs can achieve consensus. Finally, the simulation example is conducted to verify the effectiveness of the proposed method.
Dynamic modeling and analysis for transmission system of high-power wind turbine gearbox
Hongfei Zhai,Caichao Zhu,Chaosheng Song,Hua iju Liu,Guangfu Li,Fei Ma 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10
As a key component to adjust the speed and torque, double-fed speed up gearbox plays a vital role in reliability and stability for thewind turbine system. Considering the base helix angle, normal pressure angle, position angle, rotation of carrier and the mesh of the ringgear and planet gear, a coupled dynamic model for high-power wind turbine gearbox transmission system, which consists of two helicalplanetary stages and one helical gear stage was established using the lumped parameter method in this paper. Numerical integration applyingthe explicit 4/5th order Runge-Kutta algorithm was used to solve the proposed model and the dynamic responses of transmissionsystem were investigated. Results show that the modal frequencies for the system are not coincided with the gear mesh frequencies of thestages. Then, the dynamic mesh forces of the 1st stage in different models are compared and analyzed in frequency domain.
Research on fault diagnosis method of reciprocating compressor valve based on IVMD-CMS model
Fengfeng Bie,Suzhen Chen,Fengxia Lyu,Hongfei Zhu,Qianqian Li,Xinting Miao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8
As for the complex shock vibration characteristics, the issue of difficult to extract the characteristic information of reciprocating compressor valve, a fault diagnosis method combining informational variational mode decomposition (IVMD) and cyclic modulation spectrum (CMS) is proposed. In this paper, the Bayesian information criterion (BIC) is optimized for the VMD decomposition parameter firstly, and the obtained IVMD algorithm is applied to decompose the signal into intrinsic mode functions (IMFs). Secondly, the signal is reconstructed with the correlation coefficient. Finally, the CMS algorithm is utilized for the reconstructed signal analysis, from which main spectral features of the carrier frequency and cyclic frequency on the cyclic modulation spectrum are obtained. The characteristic information of the signal is highlighted with the amplitude and relationship of the frequency feature. The effectiveness and superiority of the method in the diagnosis of reciprocating compressor valve faults are demonstrated with the numerical simulation and experimental analysis.
Chuqian Lei,Ciqiu Yang,Bin Xia,Fei Ji,Yi Zhang,Hongfei Gao,Qianqian Xiong,Yufeng Lin,Xiaosheng Zhuang,Liulu Zhang,Teng Zhu,Minyi Cheng,Mei Yang,Kun Wang 한국유방암학회 2020 Journal of breast cancer Vol.23 No.1
Purpose: Tau is a microtubule-associated protein that can be found in both normal and abnormal breast cells. Whether the expression of Tau protein can predict the response to neoadjuvant chemotherapy (NACT) is still unclear. In this study, we assessed the role of Tau protein expression in predicting a pathological complete response (pCR) to NACT for different subtypes of breast cancer. Methods: Four hundred and sixty-eight eligible patients were retrospectively recruited in our study. The relationship between clinicopathologic factors, including Tau protein expression, and pCR in different subtypes was evaluated using logistic regression analysis. Correlation between Tau and disease-free survival (DFS) and overall survival (OS) was performed using Kaplan–Meier analysis. Results: The expression of Tau protein was negatively correlated with pCR, especially in triple-negative breast cancer (TNBC). No significant difference was observed in the luminal human epidermal growth factor receptor-2 (HER2)-negative subtype and HER2-positive subtype. Patients with pCR were associated with better DFS and OS (p < 0.05). However, Tau protein expression had no association with either DFS or OS (p > 0.05). Conclusion: Tau protein expression can predict pCR before NACT in TNBC, but there was no correlation between Tau expression and DFS or OS.
Xiukun Sui,Ting Xin,Xiaoyu Guo,Hong Jia,Ming Li,Xintao Gao,Jing Wu,Yitong Jiang,L.Willems2,Hongfei Zhu,Shaohua Hou 대한수의학회 2018 Journal of Veterinary Science Vol.19 No.3
Two strains of porcine reproductive and respiratory syndrome virus (PRRSV) were isolated in 2006 and 2016 and designated as FZ06A and FZ16A, respectively. Inoculation experiments showed that FZ06A caused 100% morbidity and 60% mortality, while FZ16A caused 100% morbidity without death. By using genomic sequence and phylogenetic analyses, close relationships between a Chinese highly pathogenic PRRSV strain and the FZ06A and FZ16A strains were observed. Based on the achieved results, multiple genomic variations in Nsp2, a unique N-glycosylation site (N33→K33), and a K151 amino acid (AA) substitution for virulence in the GP5 of FZ16A were detected; except the 30 AA deletion in the Nsp2-coding region. Inoculation experiments were conducted and weaker virulence of FZ16A than FZ06A was observed. Based on our results, a 30 AA deletion in the Nsp2-coding region is an unreliable genomic indicator of a high virulence PRRSV strain. The Nsp2 and GP5 differences, in addition to the virulence difference between these two highly pathogenic PRRSV strains, have the potential to be used to establish a basis for further study of PRRSV virulence determinants and to provide data useful in the development of vaccines against this economically devastating disease.