The Calculations of the electric network modes are based on the determination of electric power losses during transportation.The calculation methods used are based on the Newton method and the Jacobi matrix. The considered version of the calculation (by a number of transformations) with a small number of iterations allows to obtain the same results as when using the Newton method.
Keywords: matrix of nodal resistances, complex resistivity specific increments, losses of electric energy, compensating devices, algorithm, quadratic model, mathematical model
This work deals with the design and application questions of context-redefined computer languages for new information technologies. Realization problems of such languages are discussed for intelligent learning agents (ILA), which were applied for solving of resource consumption behavior prediction tasks in communal services. The approach is in the application of context-redefined language and it support system for problem solution. We concentrate attention to principal unpredicted changing of source function algorithms. Built-in context-redefined computer language is an essential tool for this kind algorithms support. We interested in context-redefined language synthesis. This language is used for the conditions and methods context forming for every component of intelligent agent. We pay extra attention to methods of constructive function interpretation, which can be varied or can be also changed. This synthesis is based on the interest to prediction system demands and their variations during functioning. The main idea of built-in language synthesis is to use main parts of the algorithm for ILA components with proper modification by means another algorithms and context connection. Due to this connection, the original algorithm can be changed directly or indirectly in the process of ILA functioning. As a result, We have to extract changing parts of component algorithms and organize proper interaction between every part and the context which can change it directly or indirectly. Required adaptive algorithm variation takes place on the base of obtained knowledge. At the same time, the algorithm must be implemented as quickly as possible, and the language must be simple and clear. Algorithm efficiency is based on flexibility and modifiability of the language.
Keywords: programming languages, embedded languages, context-redefined languages, intelligent agents, computer languages
Environmentally friendly approach to energy consumption implies planning the resources' amount which could be delivered and utilized by the end user. For the resource provider this means being able to get remote data from a huge number of users, with further data analysis being performed to predict future consumption. The main objective of this work was a comparison of classical regression analysis methods with neural network analysis for solving a household energy consumption prediction problem. Research was based on an array of energy consumption data collected from 47 households situated in the Rostov region (Russia) over a period of 730 days. We investigated the forecasting models based on statistical regressing of 1-st, 2-d and 3-d order and a recurrent neural network (the best result we achieved had been given by a neural network with one hidden layer of 10 neurons). Forecasting time-frame was 20% of the data-set (nearly three months) and 80% we used for training. For our data the best result was achieved by a neural network where the ratio error of the forecast practically didn't exceed 5% (mean ratio error was 0.22 and standard deviation of 3.7). For the regression models these terms were 0.37 and 6.24 for the 1-st order, 3.31 and 6.45 for the 2-d order, 0.29 and 6.7 for the 3-d order model respectively. As a result of this work we determined, that rather simple recurrent neural network provides a better result in terms of energy consumption prediction in comparison with classical regression analysis methods, though more complex networks, such as LSTM, need a wider data array to learn.
Keywords: energy resources, metering device, housing and communal services, energy consumption forecasting, data analysis, regression, time series, recurrent neural network, machine learning, “smart city”
A new parallel programming language is being developed. A feature of this language will be that, based on the developed algorithm for solving any problem, it is possible with minimal effort to generate an effective parallel program code for different computation models. Such a parallel metalanguage is based on the dataflow computing model with a dynamically formed context. The graphic version of the metalanguage has the advantage of a clear presentation of information and is much better suited to the nature of human perception. The concept of graphical programming consists in compiling a program from a set of certain objects and connecting them together according to special rules. In addition, each of the objects and the connection between them in the form of a directional line have a set of properties and attributes, which, when compiled, convert them into an object with the necessary logical load corresponding to the program algorithm being created. The article provides a graphical representation and description of such metalanguage elements as “token”, “standard node” and “single-port node”, “node with three standard inputs” and “group symmetric node”, as well as program structures: “group”, “cycle” and ""module"". A whole series of parallel programs was created using a graphical version of the metalanguage.
Keywords: graphical representation, metalanguage, parallelization of computations, dataflow computing model
There are various programming models for high-performance computing systems. Each of them has its own requirements for the structure and properties of the algorithm, which force the rewriting of the algorithm to match them. One solution to this problem is to move to a new parallel programming paradigm. The new metalanguage of parallel programming will give the opportunity to create a mathematical description of the algorithm, and then derive from it effective programs for various computing platforms. The article describes the approaches to the translation of the program into its own basic subset of the parallel language of the parallel dataflow computing system (PDCS). The basic concepts of the metalanguage are defined. The limitations of the basic subset of the PDCS parallel language are given. It describes the options for translating multi-input nodes and program structures (groups, cycles and branches). Translation of the program on the metalanguage into the basic subset of the PDCS parallel language will further help to solve the problem of translating the metalanguage into languages of other architectural platforms.
Keywords: parallel programming, metalanguage, dataflow computing model, translation from metalanguage
The problem of transmitting an image in a transmitter-receiver system over a noisy data transmission channel in JPEG 2000 and JPWL format under conditions of a previously unknown and varying intensity of noise is considered. This task is considered for the conditions of the IP network. The article aims to build methods for estimating the intensity of noise by the JPWL decoding results in the receiver and dynamically adapting the parameters of the JPWL transmitter to the current assessment of the noise intensity, ensuring the highest quality of the decoded image with the shortest length of the transmitted encoded stream. An experimental study of the relationship between the parameters of JPWL, the intensity of noise and the quality of the decoded image was carried out. It is shown that for any JPWL parameter there is a region of one-to-one correspondence between the percentage of fully recovered tiles and the probability of losing a network packet. A technique for estimating the intensity of noise by the decoding results of a single image is described. This technique can be expanded to use the results of decoding a series of images.
Keywords: noisy channel, antinoise coding, noise intensity, decoding result, JPEG 2000, JPWL, experimental model
The approach to construction a computer model of a functional information converter based on element-wise operations with multidimensional tables of numbers is investigated. A numerical decision-making algorithm based on infinite-valued logic was built and verified (in particular, fuzzification, implication, aggregation, defuzzification algorithms). The mathematical, algorithmic and software model of fuzzy decoder of the positional bipolar code in a single-unit one is investigated. The transition from the initial model given in terms of three-valued logic to a similar system having an infinite logical basis is shown. The numerical algorithm has been tested and debugged in the GNU Octave mathematical computation package environment with minimal use of functions from the fuzzy-logic toolkit.
Keywords: decoder, single-unit code, functional converter, infinite-valued logic, t-norm, fuzzification, defizzification, implication, aggregation, three-valued logic, bipolar code
This article describes an existing university database of automobile passes in Microsoft Excel. The university has two databases: permanent and temporary car passes. The negative sides of databases in Microsoft Excel are described in this article. Also, the authors analyzed the possibility of using 1C company software to account for car passes. A new database is described in the Microsoft SQL Server database management system. This article defines methods for unification an outdated database for later migration to Microsoft SQL Server. The main components of the future application software for working with the new database have been designed. By creating additional software, the likelihood of errors in the databases is minimized.
Keywords: database, Microsoft SQL Server, Microsoft Excel, university, car pass, registry, unification, migration, C#, software
The article is devoted to the description of the method of forming steganographic network messages using the ICMP service protocol for their hidden transfer, bypassing restrictions of firewalls and other computer network protection systems. It describes the functions of the ICMP protocol, its advantages when used in steganography tasks, and the specifics of processing ICMP packets by operating systems and intermediate network equipment. Special attention is paid to the practical implementation and application of the proposed method. It describes the network utilities for working with packages and an example of their use for transmitting a hidden message. For the software implementation of the network steganography method, it is proposed to use the C # programming language and the SharpPCap and Packet.NET libraries, for which the article contains examples of use and the necessary parameters for forming packets with steganographic messages.
Keywords: information security, network steganography, ICMP protocol, TCP / IP stack, encapsulation, SharpPCap
The following work is concentrated on the analysis of dynamic pressure distribution of a brake pad by using ANSYS software. A non-linear contact analysis of brake disc has been performed using Finite Element Method. The finite element model of disc and pads have been developed, and followed by an inclusive simulation of the contact analysis of disc brake system using ANSYS software. A detailed finite element model of a disc brake assembly was developed. Contact analysis was done to determine the pressure distribution, interfacial contact area and normal contact forces under both frictionless (μ=0) and frictional braking conditions. The influence of varying friction coefficients and the brake hydraulic pressure on squeal occurrence is examined. The results illustrated that the contact pressure distribution and the magnitude of normal contact pressures are far greater towards the leading edge of the pads comparing to the trailing edge.
Keywords: метод конечных элементов, распределение давления, контактное давление, шум, тормозная система , нелинейный контактный анализ
The article explores the ideas of using parsing strategies to optimize the performance of parser combinators. Considered as an example of the service data parsing PetitParser, as well as the work of the parser compiler. The optimization and analysis of the performance of the parser is also described in detail. In various examples, their effectiveness was evaluated and a comparative analysis was conducted.
Keywords: optimization, parsing, analyzer, parser combinators, performance analysis
The design of radiation-hardened circuits the use of special technologies and the use of additional circuit techniques. The efficiency of using these methods to improve the scheme qualitative indicators can be assessed by some evaluation. The paper presents the efficiency evaluation method of special voltage feedbacks application in dynamic loads of the classical differential stages. The stages with dynamic loads are apply, for example, in the schemes of differential and multidifferential operational amplifiers. The purpose of the introduction of these feedbacks is the reducing of the effect of transistors low-signal parameters instability under the influence of destabilizing factors (radiation and temperature). For the organization of feedback circuits in the structure of dynamic loads, additional voltage amplifiers based on transistors are introduced into the circuit. It is shown that this approach can increase the output resistance of the dynamic load and increase the gain coefficient of the differential stage under the influence of ionizing radiation and temperature. The efficiency evaluation method is based on the construction of a mathematical model of the scheme expressed through low-signal differential h-parameters of scheme transistors. Thus, the calculation of the main qualitative indicators of the scheme can be carried out by mathematical modeling. The obtained simulation results confirm the efficiency of the proposed circuit design.
Keywords: efficiency evaluation, circuit design, dynamic load, low-signal parameters, radiation
This paper presents a radiation hardened by design of differential stages using dynamic loads. The efficiency of proposed design methods to improve the scheme qualitative indicators can be assessed by some evaluation. The theoretical results of the evaluation of the self-compensation circuit effect of parasitic impedance of the output transistor closed collector in the dynamic loads of classical differential stages, which is realized on the base of current feedbacks, are presented. It is shown that the introduction of the current feedbacks allows to reduce the effect of transistors small-signal parameters instabilities of the dynamic load under the influence of ionizing radiation and temperature on it's quality and the parameters of the differential stages. The efficiency evaluation of the circuit solutions in differential stages of modern operational and multidifferential amplifiers is given. The theoretical results of the evaluation of the self-compensation circuit effect of parasitic impedance of the output transistor closed collector in the dynamic loads of classical differential stages, which is realized on the base of current feedbacks, are presented. It is shown that the introduction of the current feedbacks allows to reduce the effect of transistors small-signal parameters instabilities of the dynamic load under the influence of ionizing radiation and temperature on it's quality and the parameters of the differential stages. For the organization of feedback circuits in the structure of dynamic loads, additional current amplifiers based on transistors are introduced into the circuit. It is shown that this approach can increase the output resistance of the dynamic load and increase the gain coefficient of the differential stage under the influence of ionizing radiation and temperature. The efficiency evaluation of the circuit solutions in differential stages of modern operational and multidifferential amplifiers is given. The efficiency evaluation method is based on the construction of a mathematical model of the scheme expressed through low-signal differential h-parameters of the scheme transistors. Thus, the calculation of the main qualitative indicators of the scheme can be carried out by mathematical modeling. The obtained simulation results confirm the efficiency of the proposed circuit design.
Keywords: efficiency evaluation, circuit design, differential stage, dynamic load, destabilizing factors, low-signal parameters
Scientific research to determine the optimal combination of technical means in the system of cleaning and sorting seeds. We carried out a system analysis of the current state of technical means of cleaning and sorting. The main task of promising research and development work is the development of a high-precision computer-based seed sorter with an electron-optical analyzer of their properties, including the internal structure of seeds. The main result of the use of a complex of technical means of electron-optical cleaning and sorting of seeds in the selection and seed production of grain crops is an increase in their yield.
Keywords: seeds, cleaning, sorting, photo separator, x-ray, IR spectroscopy, Raman spectroscopy
State programs aimed at the development of breeding and seed production in Russia require research related to the creation of new intelligent technical systems implemented in breeding equipment, in particular in self-propelled breeding planters. As a promising direction, it is proposed to develop an intelligent technology for sowing seed and implement it on the basis of a self-propelled seed drill.
Keywords: Selection, technology of intellectual seeding, self-propelled seeder, import substitution
The risk management system of the Federal customs service of the Russian Federation needs to be improved - first of all the technology to identify the category of risk level of foreign trade activities participants in the framework of the risk categorization. When assessing the level of risk of participants in foreign economic activity, it is advisable to base the definition of the risk category on a set of heuristic rules reflecting the experience gained by customs officials and the ambiguity (blurring) of the initial data. The purpose of the study is to determine the possibility of improving the system of customs risk management by creating a fuzzy model of risk classification of traders. A prototype of fuzzy model (Mamdani algorithm) for determining the level of risk of of foreign economic activity participants, developed in the environment of Fuzzy Logic Toolbox Matlab package, is presented. Recommendations on the creation of a full-fledged model of risk categorization of traders are formulated.
Keywords: risk management system, categorization, risk level, foreign economic activity participant, fuzzy logic, fuzzy model
The article describes a method of processing, which allows to increase the efficiency of milling the end surfaces of the disks.
Keywords: Methods of metal machining, the parameters of cutting layer of metal, the cutting force, cutting modes
The article discusses the features of motor vehicle leasing. The advantages and disadvantages of this form of increasing and updating the rolling stock of the enterprise are formulated. The analytical data of this market segment are given.
Keywords: car, vehicle, motor vehicle leasing, rolling stock renewal, improving the competitiveness of an enterprise, market
The article presents the results of the development of a method for predicting trends in the development of random processes based on ordinal statistics, namely, the median and Hodges-Lehman statistics. The article discusses the proposed method in detail: it provides basic definitions, formulas for the calculation, a detailed description of the algorithm. The algorithm is implemented in the form of a software module that has practical application and can be used to solve problems of forecasting the trend of financial time series. The comparative results of applying the prediction method for the RTS index in the case of the use of the median and the Hodges-Lehmann statistics are given.
Keywords: ordinal statistics, random variable, random process, median, Hodges-Lehman statistics, forecasting, trend, mean square error, mean absolute error
science is the driving force of the development of the modern state, the successful implementation of its achievements in the production and economic activities can improve everyday life. However, there is a lack of funding for research, low level of interest in new developments and young people in research activities, the lack of integration platforms for interdisciplinary cooperation in the packaging of projects and acceptable conditions for support of small and medium-sized businesses. In order to avoid the loss of scientific potential, it is necessary to take centralized measures on the part of authorities and economic entities
Keywords: scientific activity, applied science, federal budget, regional budget, inter-faculty associations, business
The concept of “partial failure” used in practice is analyzed as a state in which the possibility of continuing the operation of a technical device remains. It is argued that partial failures are widespread in the operation of technology, but unlike full failures, under which the continuation of work becomes impossible in any mode, not fully understood. A number of reliability indicators are proposed that take into account the specifics of partial failures and the possibility of continuing work when they occur. Attention is drawn to the fact that the decision to continue the operation of the device in the presence of a partial failure is associated with risks. The essence of the risks lies in the possibility of receiving damage in the form of further deterioration of the technical condition of the partially failed device. However, in many cases such a risk may be justified. The task of deciding on the continuation of the operation, in the conditions of a partial failure is a complex task of system analysis. Its solution will require the use of complex models compiled using modern methods of mathematical descriptions and research.
Keywords: partial failure, reliability theory, reliability indicators with partial failure, risks of continued operation, making decisions on continuation of operation
The modern problem of building of big cities consists that there is almost no place left for the free building. Therefore it is necessary to carry out so-called "pointed building" when construction is conducted in the constrained conditions. At the same time very often construction sites get to an area of coverage of the subway that causes particular difficulties at construction of constructions in deep ditches.
Keywords: modeling, stress-strain, tunnel, subway, deep ditch, pointed building, ditch protection
A modification of the generalized algorithm for processing weakly formalized information is considered. It is assumed that in the processing of weakly formalized information it is important to consider external and internal factors. External factors are determined by the characteristics of the incoming information. Internal factors are determined by goals, objectives, methods, etc. The importance of taking into account the latter is that if goals are clear, tasks are set, methods for solving problems and achieving goals are known, then the volume of information being processed is significantly less and the speed of achieving goals is significantly greater. The increase in the speed of processing incoming information is achieved due to the fact that the information processing system adapts to the purpose of information processing. The dominant state of the information processing system is formed taking into account the goals of information processing and the characteristics of the incoming information (the dominant of A. A. Ukhtomsky). Thus, the processing of weakly formalized information from various technical systems allows, taking into account the dominant of A. A. Ukhtomsky, to take into account in the dynamics not only the external impact of the incoming information on the system processing information, but also the state of the information processing system. This system adjusts to the goals of information processing and taking into account the purpose of information processing and the characteristics of the incoming information, the dominant state of the information processing system (dominant) is formed. This allows you to reduce the processing time of incoming information due to the fact that the dominant formed means that the information processing system knows how to process information that has not yet arrived, but it is expected that it will soon go to the sensors of technical systems. In the process of processing the system of processing of weakly formalized information, the dominant may change over time. These changes may be due to changes in both the purpose of collecting the information and the characteristics of the incoming information. Such an approach, which takes into account the dominant of A. A. Ukhtomsky, allows processing large volumes of information in real time and can be used in the development of control systems.
Keywords: information processing, weakly formalized information, algorithm, dominant of A. A. Ukhtomsky, lack of information, control
The article describes in detail such a tool as computer modeling - the concept, its types, the application spectrum and significance. The paper considers the role of computer modelling in the research and analysis of the condition of technical objects on the example of the temperature stabilization system of the cooling element of a thermobox. The construction of a system for stabilizing the thermal mode of a cooling element of a thermobox in the form of a mathematical model is presented, and its numerical analysis is presented in the graphical simulation environment Simulink of the MATLAB software package. According to the study, conclusions were drawn about the importance and effectiveness of computer modelling in the design and evaluation of the behavior of complex systems.
Keywords: computer modelling, mathematical model, experiment, thermobox, electric motor, the Peltier element, temperature, radiator, fan, transients, steady state
Implementation of digital technologies in construction field demands a fundamental revision on the project documentation approach. First, is to re-orient the design approach by transition from two dimensional project documentation to object oriented multidimensional informational model. That leads to use of new technologies in construction production and in quality control of project documentation field. Based on previous conclusions, the problem of quality check of an information model, the check on compliance of the specifications and technical documentation of the state where construction is carried out, and on compliance to requirements of the client becomes number one priority. A general algorithm of information model verification of anthropogenic object is offered in the article. The typology of anthropogenic objects is offered. Approaches to form the lists of the compliance regulations on the specifications and technical documentation depending on type of anthropogenic object are defined. The problem of forming lists of the compliance regulations on the information model according to its stage of life cycle is separately considered. An approach to the future development of the tools to the complex analysis of information model based on the open IFC format is formulated.
Keywords: construction, cybernetics, information modeling, construction system, cybernetics of construction systems, Building information models, analysis, verification, BIM, anthropogenic object