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In this paper, we presented an approach to simulation of magnetic levitation system using nonlinear autoregressive neural network. First, the model of this highly nonlinear system is described and after that the NARX model of neural network is given. Also, numerical optimization techniques for improved network training are described and obtained experimental results from NARX network trainings are shown. It is verified that NARX neural network can be successfully used to simulate real magnetic levitation system. In future works, it can be useful for design of different control algorithms.

This paper presents the development of standardization in the field of energy efficiency, based on a review of available literature on this topic. The paper discusses the development of standardization of energy efficiency of household appliances, energy efficiency in buildings, energy efficiency in transport, standardization related to the use of renewable energy and energy management system standardization. The aim of this paper is to showcase the course of development and important events in the development of standardization in the field of energy efficiency, as well as to present an analysis of published articles on the topic of standardization of energy efficiency in prominent international journals. In research and formation of conclusions, analysis and synthesis methods are used.

The paper describes the real appearance of a new class of light sources. The technology progress allows the light emitting diodes (LED) to be applied for an in- and outdoor lightning. The special, high power diodes (HPLED) have too many advantages comparing to classical light sources and it is quite reasonable to expect their mass application in the indoor and outdoor lighting. The article contains a brief theoretical aspect of optics, explanations of the classical light sources parameters and typical examples. The performances of standard and high power LED are also included as well. The conclusions made at the paper end predict the massive usage LED for the lightning in a near future.

The overview and analysis of the most important standards in the field of energy efficiency drives, in our country and abroad, are presented in the paper. Special attention is paid to standards relating to the efficiency and control motor speed.