Victoria M. Petrova 
Advances in Engineering Research. Volume 27 

The opening chapter of Advances in Engineering Research. Volume 27 summarizes current progress in the design of multimode dielectric resonator antennas. Emphasis is placed on the operating modes achieved by different research groups, including the authors‘, as well as the feeding system used, the modes‘ radiation performances, and radiation patterns. The authors conclude that the full potential of dielectric resonator antennas can only be obtained using its multi-mode capabilities. Following this, a detailed discussion on flexible organic thin-film transistors is provided, focusing on different aspects of fabrication, emerging organic materials, characterization techniques, multidisciplinary applications and performance deteriorating issues. A mathematical model of the locomotive spatial vibrations was developed and different reasons of derailment were under investigation. Locomotive behaviour in collisions with a motionless obstacle and another vehicle is studied and the results are examined. In another study, the evolution of the stochastic digital measurement method is reviewed, particularly highlighting the two-bit stochastic digital measurement method. Topics covered include theoretical foundations and prototype instruments used in power grid networks. The closing chapter covers the development of active safety system technologies is an emerging topic, especially in regard to powered two-wheelers. In the wake of new technologies available, many governments are heavily legislating vehicle safety, is prompting the manufacturers to innovate their active safety devices.