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Main objective of this paper is research and development of the previously developed original methodology so that to be used for unavailability calculation of a complex maintained system with maintained (both preventively and correctively) and ageing input components with optional distributions of the time to failure. Original computing methodology results from the stochastic alternating renewal process...
In this paper, the authors address the problem of true Cramer-Rao lower bound (CRLB) derivation for a non-data-aided (NDA) vector parameter estimation over non-constant gain flat Rayleigh fading channel (FRFC). General CRLB expressions for carrier frequency offset, carrier phase, symbol timing and signal to noise ratio (SNR) estimation are analytically developed going through the computation of the...
Power electronics converters applied in domestic or similar installations may utilize current delay (phase) angle control to change the level of transferred power. Due to application of such types of converters, earth fault current in the installation may be strongly distorted. The current distortion level depends on a value of current delay angle. This delay angle also influences the tripping threshold...
The design of embedded control systems is rapidly change during the last decade. Guaranteeing the safety of these systems is a very challenging topic. It is possible to identify two main factors that are involved in the control of those systems: Hardware/Software (HW-SW) codesign and dynamic reconfiguration. Furthermore, the use of an embedded operating system associated with a functional module library...
In this paper a 2DOF Stewart platform for research and education in control systems and computer vision is described. We built parallel kinematic robotic platform for research nonprehensile manipulation tasks. It can be effectively used in the learning process using active educational methods. In this work we present four lab experiments of this setup at the course “Software of the mechatronics and...
The success of hybrid electrical storage systems which combines batteries and supercapacitors is related to the manner how these devices are managed. In this paper, optimal use of the complementarity between batteries and supercapacitors in electric vehicles is studied. First, storage devices are sized based on reduced size specifications of the electric vehicle. Then, power waveforms for each storage...
This article is an implementation of the results described in earlier papers for odometry modelling and navigation system synthesis. It'll be part of the introduction in Erasmus+ Innovative Open Education on IoT. It's already used for MOOC course published on national education platform https://openedu.ru/, the e-learning control theory course used in ITMO University. The main goal of this course...
The paper presents an original approach combining both testing and numerical modeling to analyze the dynamic behavior of on-shore wind turbines under vibration stress. In the first section, experimental tests are performed to examine the structural response of the three main components of the turbine (blades, tower, and nacelle). Afterward, a robust 3-D Finite Volume model is developed using ANSYS...
Adjacent and co-channel interference is one of the biggest problems in the IEEE 802.11 standard. It is believed that the issue mainly concerns the 2.4 GHz band due to insufficient number of non-overlapping channels. Co-channel interference occurs in both bands, however, and it is associated with the channel assignment method. The authors analyzed the level of interference in both bands for two AP...
Arithmetic in GF(2n) finite fields in asymmetric cryptography is the key of an efficient cryptosystems implementation. Thus, cryptosystems based on algebraic curves such as Hyper/Elliptic curves (ECC,HECC) and Pairings need a big number of arithmetic operations. They required several GF(2n) inversions and multiplications which are the most time and area consuming operations. This paper describes a...
Throughput in IEEE 802.11 networks depends on a large number of factors related to the standard version, transmission conditions in the radio channel and a number of users of the network. In addition, the bit rate obtained for the actual conditions is significantly different from the theoretical maximum bit rate defined in the standard as it can be only the part of the maximum bit rate. The authors...
Although the database schemas are an integral part of information systems, the use of software product lines has been mainly studied for the production of executable code. The impact on data management and in particular the database schemas are poorly documented and little studied in the literature. The paper is an attempt to explore some of the issues of the modeling and implementation of the variability...
We consider the integrated fractional Brownian motion with Hurst index 0 < H < 1. The main aim consists in studying its links with the quasi-helix with approximately stationary increments class of centered Gaussian processes. More precisely, we compute some well-chosen quantities which depend on the moments of the integrated fractional Brownian motion. Firstly, we check if one can obtain appropriate...
This paper is focused on the improvement of the grid current at the point of common coupling of a three-phase grid connected photovoltaic system supplying a non-linear load. This improvement is achieved by using the PV inverter as a shunt active power filter in addition to its main function of power injection in the grid. The shunt active power filtering is performed to compensate the disturbing grid...
This work presents a review of the progress in the development of the numerical methods for sample paths simulation of stochastic differential equations. The error of approximation, the order of the convergence, the stability improvement for Euler methods (explicit, implicit and composite schemes) are studied theoretically as well as numerically. MathLab programs support all the illustrations.
The main issues in security assessment are the fast identification of the set of critical contingencies and their evaluation related to the severity level. This paper presents a simple heuristic method that can identify each state of the system and classify the contingencies in order of severity. Considering the multiple faults which can affect the margin of security of electrical network, transient...
In this paper we propose improvements to the Micro-packet Transfer scheme in a multi-core device (also called reconfigurable VLSI or Network-on-chip). In particular we propose a new hierarchy based micro-packet control scheme that is especially effective for tasks require large number execution clock steps.
This paper addresses the application of an efficient and an economical method in term of enhancing voltage stability. We propose to combine the performances of SVC (Static VAR Compensator) and TCSC (Thyristor Controlled Series Compensator) to reach those of UPFC (Unified Power Flow Controller), the most pricey and polyvalent FACTS device (Flexible AC Transmission Systems). In this way, we assure stable...
The monitoring of the ambient working conditions is a crucial part in occupational medicine. A wearable system for monitoring environmental conditions including physical and chemical parameters is introduced. The system operates based on an integrated and add on-board multi-layer sensors and fusion approach. It uniquely consists of only a small and light wrist-worn device which embeds a microcontroller...
Increasing the safety of a navigation lock, by creating a modern and efficient communication between the human operator and the machine, for a prompt and accurate information offered to the operator, about the status of the equipment it serves, it is a requirement of today navigation worldwide. This paper aims to describe the implementation of a modern and efficient centralized tracking equipment...
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