×

You are using an outdated browser Internet Explorer. It does not support some functions of the site.

Recommend that you install one of the following browsers: Firefox, Opera or Chrome.

Contacts:

+7 961 270-60-01
ivdon3@bk.ru

  • Classification of university campuses by organizational and territorial basis

    The article examines the situation that emerged as a result of the higher education reform of 2006-2012. in Russia there is a modern organizational and territorial structure of university campuses, which has different types of spatial and territorial location: urban local campus, urban dispersed campus, suburban local campus, mixed. Thus, almost all federal universities are located on several campuses within the territory of the city where they are located, and several of them have campuses in several cities. Some existing classifications of university campuses according to various criteria are considered and their insufficiency for a complete scientific description of modern campuses is revealed. The existing classification by spatial location relative to the city territory is supplemented by such types as regionally dispersed campus and locally dispersed campus. The supplemented classification reflects the current situation in the Russian Federation and allows for a scientific description of modern university campuses in Russia, taking into account their organizational and territorial specifics.

    Keywords: classification, university campus, organizational structure, territorial structure, locally dispersed campus, regionally dispersed campus

  • Selection of the composition of fine-grained concrete with the use of various plasticizers

    The article examines the influence of various superplasticizers on the performance characteristics of concrete. A series of tests of samples-beams of fine-grained concrete modified with plasticizers of various types was carried out. The optimal amount of the introduced additive was experimentally determined to compare the plasticizing effect of the cement-sand mixture. Experimental data are given indicating the main operational characteristics of the material depending on the additive used. The most effective additive "Polyplast SP-3" has been determined.

    Keywords: concrete, fine-grained concrete, mixture, lignosulfonates, polycarboxylates, naphthalene sulfonates, plasticizer, superplasticizer, water demand, plasticity

  • Model of configuration of structural and functional characteristics of departmental information systems

    This paper considers the conditions and factors affecting the security of information systems functioning under network reconnaissance conditions. The developed model is based on the techniques that realize the dynamic change of domain names, network addresses and ports to the network devices of the information system and false network information objects functioning as part of them. The formalization of the research problem was carried out. The theoretical basis of the developed model is the theories of probability and random processes. The modeled target system is represented as a semi-Markov process identified by an oriented graph. The results of calculation of probabilistic-temporal characteristics of the target system depending on the actions of network reconnaissance are presented, which allow to determine the mode of adjustment of the developed protection measures and to evaluate the security of the target system under different conditions of its functioning.

    Keywords: departmental information system, network intelligence, structural and functional characterization, false network information object

  • Organizational structures of the customer in construction

    The current legislative acts and regulatory and technical documents defining the requirements for the organization of the customer's activities are considered in the work. A review of studies with different approaches to the formation of organizational structures of the customer, depending on the types of construction, their volumes and features of objects, is carried out. The factors determining the requirements for the formation of organizational structures of the customer for various objects are highlighted.

    Keywords: construction organization, technical customer, organizational structure, construction control, project approach

  • Improving efficiency of Dijkstra's algorithm using parallel computing technologies with OpenMP library

    The purpose of the study is to improve the efficiency of Dijkstra's algorithm by using the shared memory model with OpenMP library and working on the principle of parallel execution in the implementation of the algorithm. Using Dijkstra's algorithm to find the shortest path between two nodes in a graph is quite common. However, the time complexity of the algorithm increases as the size of the graph increases, resulting in longer execution time, so parallel execution is a good option to solve the time complexity problem. In this research work, we propose a parallel computing method to improve the efficiency of Dijkstra's algorithm for large graphs.The method involves dividing the array of paths in Dijkstra's algorithm into a specified number of processors for parallel execution. We provide an implementation of the parallelized Dijkstra algorithm and access its performance using actual datasets and with different number of nodes. Our results show that Dijkstra's parallelized algorithm can significantly speed up the process compared to the sequential version of the algorithm, while reducing execution time and continuously improving CPU efficiency, making it a useful choice for finding shortest paths in large graphs.

    Keywords: Dijkstra algorithm, graph, shortest paths, parallel computing, shared memory model, OpenMP library

  • Development and implementation of the concrete filled steel tube elements inverse numerical-analytical metod

    The article discusses a method for taking into account the compression of concrete using standard formulas when calculating using an inverse numerical-analytical method, taking into account the actual rigidity of concrete filled steel tube elements. The inverse numerical-analytical method makes it possible to calculate concrete filled steel tube elements for strength and stability under eccentric compression. Dependencies are presented showing the possibility of taking compression into account at various eccentricities and flexibility.

    Keywords: concrete filled steel tube elements, CFST, inverse numerical analytical method, nonlinear deformation model, concrete compression,concrete filled steel tube column, eccentric compression

  • A finite element model of the process of rolling capillary tubes with rollers

    The construction and substantiation of a finite element model of the capillary tube running-in process, which was obtained by drawing on a fixed mandrel, are considered. The rolling rolls are cylindrical and absolutely rigid. The condition for performing the work is a comparison of the resulting gap between the pipe and the mandrel and the facet formed during deformation. The solid-state model of the process is described by an adaptive grid. Under these conditions, an informative model was obtained, which was used in parametric analysis.

    Keywords: drawing with a mandrel, capillary tube, extraction, rolling, model construction, compression selection, pipe size tolerance

  • Simulation of an autonomous control system for a slitting machine of a paper machine

    The work is aimed at modeling the control system of a slitting machine of a paper machine in order to improve the quality of products and eliminate defects in winding density. The developed automated system implements the functions of controlling the operating modes of the machine, distributing the loads of the bearing shafts, braking the roll and tensioning the paper web.

    Keywords: slitting machine, paper machine, automated control system, rewinder, pressure roller, decoiler, reeler, accelerating shaft, deflecting shaft, cutting section

  • Application of neural network technologies in the tasks of quality control of textile products

    The problem of developing an intelligent automated system for detecting defects in textile materials is considered. An analysis of machine learning and deep learning algorithms was carried out in relation to solving the problem of product quality control. The implementation of an artificial neural network implemented in a Raspberry Pi microcomputer and receiving a set of input data in the form of a large stream of images from a high-speed digital camera is considered. The stages of creating a model in Python using the TensorFlow and Keras libraries are described. The development process includes the preparation of initial data intended for training and testing the system, as well as testing the operation of the resulting neural network, which consists in recognizing images of defects on fabric according to classification criteria.

    Keywords: machine learning, neural network, defect images, textile material, training, testing, accuracy

  • Modeling of processes in the dynamic system of a grinding machine

    The dynamic system of the grinding machine is simulated, taking into account tool wear. The purpose of the simulation is to improve the algorithmic support of an active control microprocessor device. The vibration characteristics of the SIW-5 machine ring support have been studied at idle and during processing to determine the vibration level at the moment when the grinding wheel touches the workpiece. An algorithm for maintaining the cutting speed with a decrease in the diameter of the circle due to wear has been developed and modeled. characteristics of the ring support of the SIW-5 machine at idle and during processing for the development of algorithms for controlling the grinding process.

    Keywords: grinding, bearing rings, active control, mathematical model of grinding, algorithmic support

  • Modern architecture, urban environment, cultural and historical resource, traditions, heritage and modernity

    The article analyzes the features of aspects of architectural activity in relation to the integration of cultural heritage objects into the structure of the modern urban environment. The cultural and historical environment, expressed in the format of material and artistic and aesthetic symbols and formations, remains a significant urban planning factor, a material objects of cultural heritage (subject-spatial structure of the cultural environment) they are considered as the most important city-forming elements that are in continuous interaction with other functional zones of the urban environment. Reorganization of the historical part of the urban environment or integration of objects of cultural and historical heritage the functional and territorial framework of a modern city appears to be multifactorial, a complex and responsible task of architectural design.

    Keywords: modern architecture, urban environment, cultural and historical resource, traditions, heritage and modernity

  • Methodology for classifying construction objects with critical defects

    This research presents a methodology for classifying construction objects with critical defects. The presented work is part of a larger research effort dedicated to a comprehensive systemic approach to solving the problem of restoring various types of housing and social infrastructure objects damaged by different types of events. The paper discusses an algorithm for classifying construction objects with critical defects, introduces the concept of "degree of defect criticality", proposes a hypothesis about quantitative values of defect criticality degree intervals, and describes the classification algorithm. The presented examples demonstrate a holistic systemic approach to solving the scientific problem of restoring damaged objects affected by various types of events such as fires, explosions, impacts, and floods. Research methods employed include synthesis and scientific analysis, data collection, statistical analysis, as well as destructive and non-destructive testing methods at different stages of the study. Conclusions and tasks for further research are formulated.

    Keywords: critical defect, degree of criticality of defects, construction object, organizational structure, organizational and technological solutions, technical condition

  • Analysis of the effectiveness of bridge reinforcement structures

    Economic development directly depends on the creation of a network of roads of the highest category. Major road construction requires large capital investments and less funds are allocated for the operation of existing roads and infrastructure. Instead of replacing bridge structures, it is necessary to use their reconstruction. The article discusses the problem of reconstruction of bridge structures, namely the restoration of carrying capacity, which has decreased during many years of operation. The relevance of the study, its goals and objectives are noted. A classification of reinforcement structures according to various criteria is proposed. The types of bridge reinforcements often used in practice, their advantages and disadvantages, are analyzed. The presented material is illustrated with photographs of objects. Successful reconstruction directly depends on the qualifications of designers and contractors, since with insufficient reinforcement, the span continues to work and is overloaded and gradually collapses. A modern method of reinforcement based on the use of carbon composite is presented. Significant disadvantages of this method for strengthening bridges and its modification using a tensioning device to secure and tension the carbon lamellas have been noted. The use of a tensioning device allows the superstructure to be partially unloaded from permanent and temporary loads. The main conclusions are presented.

    Keywords: bridge, strengthening, reconstruction, truss, carbon composite, lamella, load-carrying capacity, load-bearing capacity, tension

  • Application of large language models in simulation modeling

    The modern cycle of creating simulation models is not complete without analysts, modelers, developers, and specialists from various fields. There are numerous well-known tools available to simplify simulation modeling, and in addition, it is proposed to use large language models (LLMs), consisting of neural networks. The article considered the GPT-4 model as an example. Such models have the potential to reduce costs, whether financial or time-related, in the creation of simulation models. Examples of using GPT-4 were presented, leading to the hypothesis that LLMs can replace or significantly reduce the labor intensity of employing a large number of specialists and even skip the formalization stage. Work has been conducted comparing the processes of creating models and conducting experiments using different simulation modeling tools, and the results have been formatted into a comparative table. The comparison was conducted based on the main simulation modeling criteria. Experiments with GPT-4 have successfully demonstrated that the creation of simulation models using LLMs is significantly accelerated and has great perspective in this field.

    Keywords: Simulation modeling, large language model, neural network, GPT-4, simulation environment, mathematical model

  • On the issue of modeling a prestressed steel beam with a perforated web

    A new building structure is proposed - a welded steel I-beam with a prestressed perforated wall. The prestress in the beam is created by stretching the web and subsequent welding with chords. Before prestressing, holes are cut in the wall. Using the LIRA-SAPR software package, a model is proposed that can be used to study the operation of a prestressed perforated beam (PNPB) structure. The influence of various forms of voids in the wall on the change in the stress-strain state of steel I-beams prestressed by the wall drawing is studied. A preliminary assessment was made of the favorable effect of prestressing in a conventional perforated beam on the stress-strain state of beams with different forms of perforations in the web.

    Keywords: steel structures, prestressing, numerical experiment, normal and shear stresses, bearing capacity