Tag Archives: modeling


UDC 65.012

A.V. Potudinsky, A.P. Preobrazhensky

Process control in organizational systems is an activity aimed at fulfilling tasks (plans, fulfilling orders) throughout the list of system processes. To accomplish this task, management must timely evaluate the implementation of the program, monitor the tendency of performers to deviate from the planned norm and direct the resources at its disposal to eliminate these deviations. In many areas, the calculation of the number of intermediate and final results is automated, and staff can at any time know the numbers that characterize the progress. However, in areas such as construction, high technology and some others, it is rather difficult to evaluate how the program is implemented. Each operation to show the actual implementation of the program and control the timing of each type of result requires full monitoring. This is an expensive operation, often requiring a suspension of the process. Therefore, it is desirable that this be done as rarely as possible, but at the same time, the moment should not be missed when the tendency to deviation will develop into a threat to the program. The process of managing the work of an organizational system of a single-purpose type is considered, the volume of the program of which is expressed as a general equivalent – in units of output (tasks) or in cost. For programs that solve several important types of tasks, it is necessary to simultaneously monitor each type of task.

Keywords:control moment, organizational systems, program execution, modeling, single-purpose type.

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UDC 681.3

B.A. Chernyshov

The article considers a class of social-and-economical systems, featuring the integration of objects into an organizational whole by the managing centre. The paper shows the possibility of the managing centre goals realisation based on the rating assessment results. The author also examines the directions of formalization of rating management mechanisms based on the construction of certain classes of mathematical and optimization models. The structure of three classes of models, characterizing the organizational system objects interaction with the control centre, is substantiated: namely, streamlining, resource support and rating status. The first class is based on the use of various modifications of the integrated assessment of indicators used for rating. The second one relies on the distribution of resource provision from the rating value. The third one builds on the formalization of the evolution in the rating status of reciprocity from changes in performance indicators of the objects functioning. The construction of mathematical models allows the researchers to move on to a formalized description of optimization problems for rating management. The characterization of the structures of optimization models corresponding to the main mechanisms of rating management such as block, and discrete programming is given. The article also shows the necessity of combining numerical methods and expert evaluation to solve these issues.

Keywords: rating management, social-and-economical organizational system, modeling, optimization.

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UDC 004.942

K.R. Guseva, V.N. Knyazev

The article deals with topical issues of development of automated information systems (AIS) of enterprises on the example of a furniture company with the use of modern information technologies and appropriate modeling tools. Taking into account the obvious prospects of large-scale use of mobile devices in the information society, within the framework of the developed AIS, the design and software implementation of a mobile application for the convenience of customers of the furniture company was carried out. The developed AIS furniture company and mobile app allow you to increase the efficiency and comfort of the processing of customer requests for company personnel involved in this process and for the customers, placing orders and supervising their implementation with the help of mobile apps. Appropriate ontological, functional and visual modeling tools were used in the process of AIS and mobile application design. Taking into account actual and perspective tendencies of improvement of the automated information systems of management in modern management assuming active use of computer simulation modeling for research and improvement of parameters of functioning of the realized AIS development and research of simulation discrete-event GPSS-model is carried out. An important feature of the proposed model is that it, unlike similar models, is complex and allows to consider not only the managerial processes for the processing of applications and other business processes, such as Assembly, loading and delivery of furniture to customers and has funds research sojourn time of requests in the system taking into account the specific type of furniture and no such accounting controls placement of furniture in the back of the car taking into account the size of furniture, means of calculation of financial-economic parameters of the enterprise with the aim of maximising profits and other means of research. Based on the results of the study, practical recommendations are given to optimize the management and production processes of a furniture company in Penza.

Keywords: information technologies, automated information system, mobile application, modeling.

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UDC 004.7:421

S.A. Laptik, F.N. Abu-Abed

This paper devoted to the development of software designed to simulate networks with heterogeneous load, with further determination of the characteristics of network traffic. Traffic pulsations, inhomogeneities of application flow form an uneven load in computer networks. The process of modeling networks before their direct design is of paramount importance, respectively, the development of software (tool) for modeling networks is an important task. The development of algorithmic and software tools for modeling network traffic greatly simplifies the process of researching computer networks and contributes to the development of recommendations for further redistribution of load between network nodes. Each model under development has its own limitations and the reliability of probabilistic simulation results, which depend on the chosen mathematical apparatus, depends on them. The apparatus of queuing theory allows analyzing the results obtained at the level of their average values, and simulation modeling allows monitoring changes in network traffic over the entire simulation period for a set model time. The developed software is based on the modification of the already existing classical algorithm for calculating the performance of computer networks with heterogeneous traffic. The algorithm allows to optimize the values of parameters aimed at improving the performance indicators of networks with heterogeneous load.

Keywords: modeling, computer networks, network traffic, networks with non-uniform load, performance.

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UDC 681.3

Y.E. Lvovich, A.V. Pitolin, G.P. Sapozhnikov

The article justifies the necessity of building various classes of mathematical models of complex systems as well as the relevance of a multi-method approach to the processing and modeling of monitoring and rating information, due to the variety of management tasks and resource efficiency optimization management of a non-profit educational organization in combination with rating management. The starting points are tentatively reduced sets of input indicators influencing the output indicators of a management unit functioning. It is based on time series forecasting on the base of additive and elementary functions. The dependence of the output performance on the input ones is determined by the regression model with the inclusion of time variables. The transition from a regression model to a neural network model is carried out, to improve the accuracy of forecasting for the purpose of managerial decision making at a certain planning horizon. The transformation procedure of initial time series into statistical samples of their prognostic estimates followed by randomized training sample development is proposed. The paper also demonstrates that the multi-method approach to the modelling provides a solution to a number of tasks concerning complex systems resource efficiency management.

Keywords: forecasting, modeling, management, resource efficiency, randomization

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UDC 681.3

A.N. Schwindt

A characterization of the functioning of network objects in a multi-dimensional information monitoring environment is given. The main aspects of the evaluation of the quality of functioning in the conditions of digitalization are considered. The necessity of development of object-oriented methods of mathematical modeling and numerical optimization of the process under study is shown. The two-level nature of the orderliness of the elements of a multidimensional information monitoring environment and the possibility of their representation in the form of numeric sets are substantiated. The main classes of numeric sets transformations are given. The dependence of the majority of transformations on expert assessments in the interaction of the incorporation of network objects with the managing centre and consumers of the results of the operation are evaluated. The types of mathematical modeling and methods for their implementation that correspond to the transformations of the numeric sets: structural, statistical, expert-aggregation, expert-classification, expert-optimization are proposed. At the same time, expert optimization modeling is aimed at the sequential reduction of variants of qualitative functioning of network objects with the use of numerical methods of randomized search and expert evaluation.

Keywords: : network objects, high-quality functioning, information monitoring, numeric set, modeling, numerical optimization, expert evaluation.

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UDC 53.072:691.32: 536.4

A.S. Molodaya, S.D. Nikolenko, S. A. Sazonova

The work is devoted to the problem of physical simulation of high-temperature impact on dispersed-reinforced concrete. The results of experimental studies of the behavior of fine-grained fine-grained concretes with metallic fiber (steel fiber-reinforced concrete), in the high-temperature effect modeled in the muffle furnace, are presented. The muffle furnace is selected on the basis of the required high-temperature exposure parameters. In particular, the maximum heating temperature, the rise time of the temperature to the required 8500C. All selected parameters are well correlated with the parameters of real fires. The medium of the working space of the muffle furnace when creating the temperature effect is air. One of the advantages of the selected muffle furnace is the ease of operation and sufficient stability of the maintained temperature. The technique of carrying out the experiment at different high-temperature effects on steel-fiber-reinforced concrete has been worked out. It is shown that the use of dispersed reinforcement in the form of metallic fibers improves the state of experimental samples after high-temperature exposure of a given level. It was revealed that the degree of influence of disperse reinforcement on the state of samples depends on the percentage of reinforcement and the magnitude of the temperature effect. It is shown that an increase in the time of high-temperature exposure affects the state of the samples. The results of the research will help further develop the process of physical simulation of high-temperature heating in the study of the properties of building materials.

Keywords: method of travel of queue, the method of finding an open, adaptive model, local adaptive management.

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UDC 004.94:574

P.S. Kuprienko, V.J. Manohin, S.A. Sazonova

The article presents the results of modeling the maximum permissible emissions from production processes at asphalt plants. The aim of the research is to calculate the maximum allowable emissions from process industries in factories. To achieve this goal, a simple and easy-to-use nomogramm method was developed. Studies have shown that the developed method for determining the maximum permissible emissions, based on the use of straight and mesh monograms, can significantly reduce the labor intensity, as well as the cost and time of rationing emissions of pollutants into the atmosphere compared to the existing methods of calculation of maximum permissible emissions in the regulatory literature. The determined values of maximum permissible emissions are necessary for the assessment of the existing environmental situation at asphalt plants, for the development of measures to improve the environment and working conditions at hazardous and harmful industries. Verification of the proposed method was carried out not only by comparing with existing methods of calculation, as well as by comparing the results with the results presented in the finished draft standards of maximum permissible emissions at production facilities. As a result, the calculation of maximum permissible emissions in the projects according to the proposed method gave a deviation of no more than 8% compared with the corresponding data obtained by the method in the regulatory literature.

Keywords: modeling, nomogramms, maximum permissible emissions, asphalt plants, technological processes, environmental safety, labor safety.

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UDC 621.396

A.V. Ponachugin, I.V. Gusev

Telecommunications services are now widely used throughout the world. These services in the aggregate of individual multi-service networks. The problem of using telecommunications services is that it is not at all remote sites. And with this you can translate channels and communication lines. The purpose of the study is to create a radio access model to the resources of a multiservice communication network at the channel level. As a multiservice network, which provides such telecommunications services as: videoconferencing, IP telephony and data transmission. The network under investigation is built on the basis of the “Ethernet” technology, and a radio link using access, organized using one of the modern technologies of broadband wireless access. The received data presented on the site are presented in the following edition: In the MatLab software environment, the proposed radio access algorithm to the resources of the multiservice network at the second level of the reference model of the interaction of open systems (the channel level) is implemented. During the simulation, data were received on the load of the channel and on the number of delivered packets, which were displayed in the form of graphs. Based on the results of this study, it can be concluded that this model serves as an illustrative example of radio access research, showing that the result of the work, both successful and information packets are transferred between sources. The proposed model is of practical value, it is aimed at studying the influence of stochastic and deterministic processes that arise as third-party factors in the transmission of data over a radio channel, and also such a system, provided the radio access system.

Keywords: modeling, radio access system, multiservice network, radio access technologies, telecommunication services.

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UDC 681.5.01

S.V. Ippolitov, О.N. Choporov, D.V. Lopatkin, A.V. Sizov

The work is devoted to the solution of the actual scientific and technical problem related to ensuring the required accuracy of control in a group in the automatic mode. The technique for synthesizing an algorithm for automatic control of fast moving dynamic objects in their joint motion based on the theory of covariance control is presented. The essence of the theory is to provide a given steady-state value of the covariance matrix of the state of a linear system by means of feedback. The approach is substantiated and a numerical algorithm for determining the achievable covariance matrix of the system formalizing the specified requirements for the accuracy of control in the group flight mode in terms of the RMS errors of the controlled parameters is developed. The numerical algorithm for solving the synthesis problem of an achievable covariance matrix is based on the method of solving linear matrix inequalities (LMI), using the cvx package of the Matlab system. A general linearized model of the relative motion in the group is developed, taking into account external perturbations of the turbulence of the atmosphere and the random wind and internal disturbances associated with the dynamics of the control system drives. To take into account the influence of a random wind, the Dryden model, which describes the turbulence of the atmosphere, is used. On the basis of the described mathematical model and the developed algorithm, numerical modeling is carried out to evaluate the accuracy of control under the influence of perturbations.

Keywords: dynamic objects, synthesis, algorithm, control, matrix, modeling.

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