Volume 3, Nº 20 (2015)

The article considers the study results of on-state linear propagation velocity dependences on current density in open thyristors by varying the values of their geometric parameters. The study was carried out on the basis of modelling of thyristor turn-on in Synopsys TCAD software environment. The approximation dependences of on-state propagation velocity on thyristor geometric parameters are presented.

This article discusses the current approaches to the problem of limiting switching overvoltage on power semiconductor devices. The author studies the mathematical relations that describe transient processes when turning off power semiconductor devices considering the set of parameter values of snubber circuits. Conclusions are made on the advantages and disadvantages of the methods. Some ways of their improvement are suggested.

Due to the rapid development of network technology and universal introduction of multi-user computer systems, the problem of user authentication has become particularly relevant. This article considers the user authentication methods with a focus on analyzing the keystroke dynamics.

The article considers the role of financial analysis in the company prospects. The authors focus on the problem of neural network modelling to predict the company financial performance by using of MATLAB software package.

The article presents the mathematical relationships describing the processes that occur in valve shoulder devices when turned off. The approaches to defining snubber circuit parameters are considered. Conclusions are made on the shortcomings of the existing techniques. Some ways of their improvement are suggested.