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Paralleling devices is an effective way to achieve a higher power application while still having the convenience of using discrete devices. However, the mechanisms of potential failures and the circuit design considerations have not been thoroughly studied yet, when paralleling gallium nitride high-electron-mobility transistors (GaN HEMTs) in cascode configuration. This paper presents a comprehensive...
Paralleling devices is an effective way to achieve higher power applications while still having the convenience brought by discrete devices. However, very few papers investigate the challenges of paralleling Gallium Nitride high electron mobility transistors (GaN HEMTs) in cascode configuration, especially the potential failure modes and its related mechanisms. In this paper, a comprehensive study...
Based on role-based access control, the conception of Hierarchical role is proposed. For the dynamics of Cloud computing environment, we divided the trusted level of the users and updated the trusted value of the users in real time. Then we allocated the corresponding role according to the trusted value. In the traditional access control model, system's security control strength was fixed. Once the...
The uncertainty of the trustworthiness of the information has been a great obstacle for users to obtain and share true information on the Internet. Therefore, it is worth to further study the evaluation of the information credibility. This paper introduces a kind of evaluation method of information credibility based on the trust features of web page. After the trust features are defined according...
System performance of cellular networks could be improved by D2D communication. A retransmission scheme within D2D group is proposed for the case of data sharing. When all the D2D UEs failed to get data packet from BS by cellular links, retransmission is still carried out within the group. Because of the enhancement of receiving SNR, a UE could decode the data with a higher probability. Analysis and...
Induction motors are widely used in industry, and usually have a long life. To predict the life and reliability of the motors within a reasonable time, a simple and available accelerated degradation testing method is presented. To simulate the unbalanced load on the motor, the lamina with circular holes is mounted on the shaft of the motor eccentrically, and different unbalanced loads are obtained...
On the ground of high resistance to pressure, long life and good retractility, the welded metal bellows are widely used by the space industry. Their performance reductions have a serious effect on the system reliability of space products during the storage. The strength and stiffness analysis of welded metal bellows are performed by theoretical research, numerical simulation and test verification...
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