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In the given article described principles of modeling of the transformations elements of power sources control. The classical methods of modeling of transformations circuits do not provide necessary accuracy due to complexity of representation of interdependence between input and output quantities and parameters, and the difficulty in representing inter chain and inter chain dependencies and providing...
Background: Many relevancy filters have been proposed to select training data for building cross-project defect prediction (CPDP) models. However, up to now, there is no consensus about which relevancy filter is better for CPDP. Goal: In this paper, we conduct a thorough experiment to compare nine relevancy filters proposed in the recent literature. Method: Based on 33 publicly available data sets,...
This paper presents a new configuration of an off-grid single-phase generator using a three-phase induction machine. The use of this kind of machine, cheap and robust, is in line with the “jugaad” philosophy, better known as frugal innovation. In such an application, three-phase induction machines are usually operated as stand-alone single-phase generator which are either self-excited using terminal...
The article describes the main directions of the modern theory of business processes. There are provided a brief overview of the main models and methods for each of these areas.
The article gives consideration to the problem of the open dynamic systems' modeling. We propose its solution with the help of stochastic systems of differential equations. We provide the methodology of modeling and analyze the certain example.
The present paper considers a problem of assessment of cybersecurity architecture of modern digital control system using a formal hierarchical model of the cybersecurity policy. As a basis for formal security model the extended discretionary take-grant security model is presented. The formal technique used to provoke thoughts about the way how the rights and information may be passed along the systems...
Privacy is an important issue for big data including sensitive attributes. In the case of directly sharing or publishing these data, privacy breach occurs. In order to overcome this problem, previous studies were focused on developing big data anonymization techniques on Hadoop environment. When compared to Hadoop, Spark facilitates to develop faster applications with the help of keeping data in memory...
The fundamental roots of micro-grids are different types of renewable energy sources. There are two broad and distinctive control set ups for power systems. They are centralized and decentralized (hierarchical) controls. In market models of micro-grids there are normally groups of electricity sources and loads that operate in synch with a centralized grid or macro-grid. This paper studies the functionality...
Paper presents some specific technics developed to improve the modeling of Multiunit Probabilistic Safety Analyses (MUPSA) level 1. PSA has the goal to calculate risk metrics, as for instance Core Damage Frequency (CDF) for the reactor core. On the other side, extended targets for PSA, by considering more hazards at a time and effect of those on more than one nuclear reactors at a site, make the evaluation...
The paper presents results of original investigations of features of the state estimation of the power system with a quadrature booster, which is differently considered in calculations. In investigations, one takes into account a case, in which characteristic features of the quadrature booster are considered, and a case, in which the quadrature booster is treated as other phase shifters. The state...
The article describes operational principles of the modeling tool for forecasting the world liquid fuels market, part of the ERI RAS modelling complex. The liquid fuels market forecasting Block functions as a tool for long-term forecasting of the oil industry development, government and corporate planning.
The article is devoted to the long-term improvement of the Russian gas industry development model for the period of up to 2035. New approaches to forecasting gas production at major fields, transportation of pipeline gas and spot market gas purchases are being updated.
General approaches to the modeling of adaptive organizational systems are formed in the paper. The approach is based on the possibility of representing the organizational system by a family of models. They must represent certain levels of the organization that simultaneously possess the specified property. As an instrument for ensuring adaptability, appropriate management is considered. Uncertainty...
Using the example of the Ministry of Education and Science of the RF, the work examines variants of the most effective inspections to be built and conducted in the subordinate organizations. The work includes ready models of cumulative expenditures that take into account inspection expenses as well as the losses incurred by errors and violations. The analysis tools include simulation and regression...
Supercapacitor, as a new type of energy storage device, has broad application prospect in the power system and others. It is very significant to establish an accurate model to reflect the actual job characteristics for supercapacitor reasonable use, performance optimization and system simulation. This article summarizes all kinds of supercapacitor model, points out the characteristics of the existing...
Aiming at the shortcomings of current evaluations on determining the weight coefficient of all the indicators, a comprehensive condition assessment model based on health index is proposed for power transmission and transformation. The evaluation index system, which is using hierarchical analysis, is established and then the weight is determined by the statistical and expertise method. The system is...
Energy saving of compressed air system was studied in this work. The whole process model including compressor's performance, pressure loss of pipeline and pressure change of storage tank was founded. And then compared with performance equations of FSD compressors, energy cost and related Volumetric efficiency change along the variable frequency was achieved. With these models founded, simulations...
Food safety is one of the hot issues in all over the world. It is related to national economy and people's livelihood. In recent years, food safety accidents occur in China frequently, so an effective food safety network public opinion early warning model is necessary and imperative. Therefore, the model of Back Propagation neural network based on Analytic Hierarchy Process (AHP-BP) is proposed. The...
A high breakdown voltage AlGaN/GaN HEMTs is fabricated by using source-connected field plate (SCFP) in Dynax. The output capacitance (Cds) of this device shows a strong dependence on Vds. A modified Angelov large signal model considering Cds nonlinearity is presented to achieve a more accurate simulation on efficiency and linearity. The small signal simulation results indicate that the proposed nonlinear...
This paper presents the circuit model that is used for the cross-coupled charge pump design algorithm. Symbolic description of the pump stage model as an analog functional block for high-voltage application is firstly discussed. Design process has been done by using simplified BSIM model equations assuming the long channel MOSFET. Characteristics have been verified by ELDO Spice and compared with...
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