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1,030 results on '"Wang, Wenming"'

20. Classification and Recognition of Encrypted EEG Data Neural Network

Author

Liu, Yongshuang, Huang, Haiping, Xiao, Fu, Malekian, Reza, and Wang, Wenming

Subjects
Computer Science - Machine Learning, Electrical Engineering and Systems Science - Signal Processing
Abstract

With the rapid development of Machine Learning technology applied in electroencephalography (EEG) signals, Brain-Computer Interface (BCI) has emerged as a novel and convenient human-computer interaction for smart home, intelligent medical and other Internet of Things (IoT) scenarios. However, security issues such as sensitive information disclosure and unauthorized operations have not received sufficient concerns. There are still some defects with the existing solutions to encrypted EEG data such as low accuracy, high time complexity or slow processing speed. For this reason, a classification and recognition method of encrypted EEG data based on neural network is proposed, which adopts Paillier encryption algorithm to encrypt EEG data and meanwhile resolves the problem of floating point operations. In addition, it improves traditional feed-forward neural network (FNN) by using the approximate function instead of activation function and realizes multi-classification of encrypted EEG data. Extensive experiments are conducted to explore the effect of several metrics (such as the hidden neuron size and the learning rate updated by improved simulated annealing algorithm) on the recognition results. Followed by security and time cost analysis, the proposed model and approach are validated and evaluated on public EEG datasets provided by PhysioNet, BCI Competition IV and EPILEPSIAE. The experimental results show that our proposal has the satisfactory accuracy, efficiency and feasibility compared with other solutions.

Published
2020
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31. CFD analysis and optimization of axial flow fans

Author

Liu Renhui, Xu Shubo, Sun Kangwei, Ju Xiaoyu, Zhang Weihai, Wang Wenming, Ma Xiquan, Pan Yuefei, Li Jianing, and Ren Guocheng

Subjects
axial fan, finite element analysis, structural optimization, performance curves, aerodynamic performance, Industrial engineering. Management engineering, T55.4-60.8, Industrial directories, T11.95-12.5
Abstract

The axial fan plays a vital role in the safe production of the mine, and in this paper, a mine axial flow ventilator is designed through numerical simulation to meet the demand of air exchange inside and outside of the mine, so as to maintain the oxygen supply of the mine and discharge the harmful gases. Finite element analysis of four structural factors of axial fan blade installation angle, number of blades, deflector plate, rotational speed, drawing fan wind pressure and rotational speed cloud diagram, calculation of axial power, by analyzing the distribution of the cloud diagram to design the shape of the fan blade, and derive the change rule of the wind pressure when changing the structure of the fan. By using gradient descent method to control the percentage of imported mass flow rate, the P-Q performance curve of the fan is obtained, which optimizes its aerodynamic performance, improves efficiency, and extends its service life.

Published
2024
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46. Auditor Appointment Strategy and Intragroup Value Transfers: Evidence From Family Business Groups.

Author

Cheung, Yan-Leung, Haw, In-Mu, Tan, Weiqiang, and Wang, Wenming

Subjects
FAMILY-owned business enterprises, AUDITORS, RELATED party transactions, FINANCIAL statements, CORPORATE governance
Abstract

Family business groups (FBGs) typically control several member firms and can hire a single auditor or multiple auditors to audit their member firms. This article examines what type of auditor appointment strategy constrains intragroup value transfers within FBGs. Analyzing related-party transactions (RPTs) within FBGs in Hong Kong, this study provides evidence that FBGs with multiple auditors undertake more intragroup value transfers than FBGs with a single auditor. However, the adverse effect of multiple-auditor appointments is mitigated by a stronger board and higher financial reporting comparability among member firms. Using an alternative measure of intragroup value transfers, we also find that the market perceives multiple-auditor appointments as impairing audit effectiveness. Overall, our findings offer the new insight that controlling families can exploit the appointment of multiple auditors as a "divide and conquer" strategy which undermines the monitoring role of auditors against intragroup value transfers, but stronger corporate governance of member firms can mitigate the adverse effect. [ABSTRACT FROM AUTHOR]

Published
2023
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