bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical simulation and experimental investigation of heat transfer and flow structures around heated spherical bluff bodies
Authors: Abed A H , Shcheklein S E , Pakhaluev V M 
Published: November 2019

Abstract
The objective of this work is to evaluate the influence of vortices on heat transfer behaviour and a flow structure around a heated sphere. Numerical simulation and experimental verification are performed using a stationary copper sphere located inside a cylindrical channel with a constant channel-to-sphere diameter ratio. Numerical simulation is done for three-dimensional steady-state flow using ANSYS-FLUENT by solving the Reynolds-averaged Navier Stokes (RANS) equations. Over the test range of Reynolds numbers (2500-55000), CFD simulation results are in reasonable agreement with experimental data. The importance of vortices on heat transfer behaviour was investigated by taking the surface temperature and heat transfer coefficient (HTC) measurements around the sphere surface as a function of a zenith angle. The CFD simulation results confirmed that the impact of vortices on heat transfer behavior occurred in a lower-rear area of the sphere with a zenith angle (from 120° to 180°).
New statistical method for generating sequences of pseudo-random numbers
Authors: Denisov M A , Chzhan E A , Korneeva A A , Kukartsev V V , Tynchenko V S 
Published: November 2019

Abstract
The paper describes the algorithm of the precision generator (hereinafter the P-generator) of random variables. Its feature is the ability to reproduce samples of large and small amounts of data with high accuracy knowing only the type of distribution. The created program module, which is based on the algorithm described in the work, is capable of generating a sample according to four distribution laws: normal, exponential, Laplace and Pareto. The proposed statistical method is based on calculating the number of points using priori known density distribution formula of the selected law. Further generation of the found number of points is implemented using the built into C# programming language random numbers generator. Computational experiments, which are given in the work, demonstrate the accuracy of the algorithm and also allow one to conduct a comparative analysis with existing alternatives (such popular mathematical and statistical packages as Mathcad and Excel).
Statistical approach to building a model of recognition operators under conditions of high dimensionality of a feature space
Authors: Fazilov Sh Kh , Lutfullaev R A , Mirzaev N M , Mukhamadiev A Sh 
Published: November 2019

Abstract
The task of constructing recognition algorithms (RAs) focused on the classification of objects under conditions of high dimensionality of a feature space is considered. As an initial model, a model of RAs based on the calculation of estimates is considered. A distinctive feature of the proposed model is the formation of subsets of interrelated features (SIF) and the selection of a set of representative features (RFs) in the construction of RAs. Moreover, the proximity estimates between the object and the class under consideration are calculated on the basis of the Bayesian approach. The main advantage of the proposed operators is the allocation of preferred dependency models with the subsequent calculation of the assessment of the ownership of objects and ensuring a significant reduction in the number of computational operations when recognition unknown objects. This feature is very important for real-time recognition systems. To test the performance of the proposed model, experimental studies were carried out in solving a model problem. This model can be used in the compilation of various programs aimed at solving problems of forecasting and classifying objects defined in the space of features of large dimension.
Evaluation of components influence of fillers in building materials on their physical characteristics by means of computer data analysis
Authors: Garashchenko A A 
Published: November 2019

Abstract
The article presents an analysis of the dependence of the strength characteristics of new polymer-mineral composite building materials on the percentage of mineral filler components. The influence of the main components that are not included in the noncrystalline phase of the samples under study on the physical and mechanical properties of the materials under study was evaluated. The results showed that the use of substances with a high content of crystals with perfect splitting without crystals with imperfect splitting as fillers for a polymer composite could contribute to the production of building materials with high strength characteristics. These results can be used to assess the joint influence of components on both the physical characteristics already considered and others.
Application of the method of finite element analysis in studying the reliability of various options of fixation of models of human pelvic bones
Authors: Grin A A , Starikov A I , Kokorin I N , Yadryshnikov A I , Namyatov D S 
Published: November 2019

Abstract
Modern society is already unthinkable without computer-aided design systems, which are systems that implement information technology for performing design functions. These technologies are actively used in all branches of human activity, including in medicine [5]. It is known that the use of an external fixation device makes it possible to cure complex cases of fractures of human pelvic bones [4,6]. To simplify the design, secure fastening, reduce trauma, various types of external and internal fixation devices are applied. Nowadays, treatment of complex fractures of human pelvic bones with the help of the fixing Ilizarov apparatus takes place on the basis of the facts of analyzing the patient’s condition, that is, by an empirical method. Eliminating modeling from the design calculation may aggravate the patient’s condition due to such factors as excess load on the frame or its insufficient rigidity.
Model of wood impregnation after incomplete drying as an additional energy management tool
Authors: Kantyshev A V , Zaitseva M I , Kolesnikov G N 
Published: November 2019

Abstract
The problem of rational energy use is directly related to sustainable socio-economic and technological development, so its solution is a complex priority. Energy efficiency in modern industry is achieved through the improvement of management methods and the use of energy-saving technologies. The aim of this work is to analyze the possibility of reducing energy consumption in the technology of wood fire-retardant impregnation after incomplete drying. The study uses experimental methods and methods of mathematical modeling. It is established that the efficiency of wood impregnation according to the criteria of time and energy consumption increases with a decrease in the time interval between the drying completion and the impregnation start, and also depends on the degree of pre-drying, which should be sufficient, but not excessive. The adequacy of the results is confirmed by their consistency with the known literature data.
Non-parametric algorithm of omissions filling in stochastic data
Authors: Korneeva A A , Chzhan E A , Denisov M A , Medvedev A V , Kukartsev V V , Tynchenko V S 
Published: November 2019

Abstract
The paper presents the results of an algorithm for data processing. In the initial data omissions may occur due to different control discreteness of input and output variables. The paper proposes a non-parametric algorithm for filling gaps. The basic idea is to calculate the non-parametric estimate of the regression function from observations obtained from the object. This allows using all available measurements. Numerous computational experiments have shown that the use of the proposed algorithm has improved the quality of the resulting model several times. The algorithm is influenced by such parameters as the total number of omissions in the sample of observations, measurement interference in communication channels, and the type of object. It should be noted that the developed algorithm is universal and does not depend on the type of equation of the object.
Transient analysis of queueing system with two heterogeneous servers
Authors: Korolkova L I , Mashrabov N , Murzin A M , Panfilov A V , Siuskina Ju L 
Published: November 2019

Abstract
A method that uses an open-end diagram of queueing system functioning and relative probabilities is applied to study the queueing system with two heterogeneous servers, which is functioning within a given time period. According to the method a service process diagram is drawn. A feature of the method is the calculation of durations of the processes residual from the previous state. It allows describing in detail the functioning process of the queueing system for both infinite and finite time periods. The difference of the method from other approaches is the application of relations for computation of states without formulation and solution of any equations, absence of constraints on distribution of service time and inter-arrival time. The authors analysed the queueing system with arbitrary distributed service time and inter-arrival time, which is functioning within a random time period. Each state is characterized by idle time of devices or availability of the queue that allows, as a result, computing probabilities and average durations of idle time of servers, distribution of queue length, average time of stay in queue.
Model of river channel for timber transportation
Authors: Posypanov S.V. , Kozlov V.G. , Skrypnikov A.V. , Nikitin A.A. , Tikhomirov P.V. 
Published: November 2019

Abstract
The model of river channel for timber transportation allows the most efficient delivery of timber to consumers; ensures the minimization of material loss and negative environmental impacts. The model is especially useful in case of rivers with short shipping season, since the delivery of goods is carried out in a very limited time frame when the levels change dynamically, when the shipping conditions are rarely favorable and when the information about the transport dimensions is absent. Information received from the pilot charts when the levels differ from the design ones is worth being verified, which might be time consuming. However, with the help of these charts and at rather low cost the model can be designed. The purpose of this work is to solve the aforementioned issue. The simulation model under study differs from most digital surface models. The riverbed is depicted as a combination of its cross sections. They are connected by a line passing through the water surface at a design level above the waterway. According to the size of the channel and radius of waterway curvature, the allowable raft sizes are calculated. The minimum sizes are referred to for calculating the route.
Hybrid metric to reduce labour costs in assessing the complexity of the programs
Authors: Kukartsev V V , Tynchenko V S , Boyko A A , Denisov M A , Kukartsev V A , Chzhan E A 
Published: November 2019

Abstract
The article deals with the problem of assessing the complexity of software products. A review of widely used metrics (number of lines of code, average number of lines for functions, Halstead’s metrics, Jilb’s metrics, ABC-metric) is being conducted, on the basis of which a conclusion is drawn about their deficiencies. Also, indicators are analyzed, subtracted when assessing the complexity of programs, such as: program saturation with conditional operators or cycle operators, complexity of program understanding, program coding complexity, program content. A hybrid metric based on a composition of already well-known ones is proposed. As a result of the experiment to assess the complexity of the program, it is shown that the proposed hybrid metric allows us to more effectively evaluate the program. The use of such a metric can significantly reduce the computation time.
Simulation technological process of repair units of railway stock with ARENA
Authors: Kutyshkin A V , Brylova T B , Shashok A V 
Published: November 2019

Abstract
The paper discusses a number of issues related to the use of simulation modeling of technological processes of repair units of the rolling stock. A simulation model for modeling the technological process of repairing a critical rolling stock node in the ARENA environment is presented and described. The analysis of the simulation results in the context of setting and solving the main tasks of the organization and production management is carried out.
The use of a combined scheme of mathematical modeling for the continuous heating furnace of metallurgical production
Authors: Osintsev K V , Prikhodko Iu S 
Published: November 2019

Abstract
In this paper, it is proposed to put the finite volume method into the basis of a mathematical model of a heating furnace. The finite volume method is used in modern computer programs for calculating gas-dynamic flows. It is advisable to use a combined scheme when building a mathematical model in accordance with the results of data analysis of the continuous heating furnace of the metallurgical rolling production and its disadvantages. The novelty lies in the fact that for the first time it is proposed to use a finite volume method with a combined difference scheme for the heating zones of a continuous furnace of a metallurgical rolling manufacture for calculating a furnace. Such calculation algorithms make it possible to give recommendations on reducing heat losses in a furnace. Mathematical model building can lead to a significant reduction in fuel consumption and an increase in economic efficiency when using heating continuous furnaces of metallurgical rolling production.
Comparative evaluation of the effectiveness of the laser scanning and aerial photography systems using unmanned aerial vehicles
Authors: Chepyzhova A V , Pravdina E A , Lepikhina O Yu 
Published: November 2019

Abstract
This article discusses two modern methods for making mine surveyor surveys: using ground-based laser scanning systems and aerial photography from an unmanned aerial vehicle. Methods are described in terms of time costs, the number of employees and instruments involved, the cost of the work, the necessary computer capacity, depending on weather conditions. The paper also assesses the difference in calculating the volumes of the blasted rock mass. The author made a conclusion about the possibility of using the considered methods for calculating volumes and accuracy sufficient for surveying measurements. This study is based on the experience of using these technologies in real production - Karelsky Okatysh JSC.
Analysis of machine learning methods to improve efficiency of big data processing in Industry 4.0
Authors: Prudius A A , Karpunin A A , Vlasov A I 
Published: November 2019

Abstract
The article considers the basic methods of machine learning applied by individual entrepreneurs within the framework of transition to digital production to improve the efficiency of data processing, classification of existing and would-be customers and their subsequent work with them. The main attention is paid to the problem of increasing the effectiveness of methods of machine learning applied for solving the current questions. Areas of application of technology are shown. The peculiarities of machine learning are briefly analyzed. The main features and prospects of the development of Machine Learning services are shown on the basis of the concept of a step-by-step combination of the methods under consideration. One of the main algorithms for working with data is analyzed; its main features, scope and procedure are described. Recommendations are given for the further use of machine learning algorithms. The role of machine learning in the development of modern science and industry is analyzed, the main tendencies of the industry development are determined, and the practical application of big data is shown. As part of the transition to Industry 4.0, the main areas of application of machine learning, big data, Artificial Intelligence and their relations with the corresponding fields of science and production are described. The article also offers a review of the application of Artificial Intelligence and machine learning in particular in the context of the transition to digitalization and the issues of individual entrepreneurship.
Computer assisted data analysis for predicting the protective potential of hull structures of ships and floating facilities
Authors: Rodkina A , Kramar V , Ivanova O 
Published: November 2019

Abstract
Nowadays, stress corrosion fracturing of hull structures of ships and floating facilities is a matter of concern. Considering the presence of the juvenile surface at the tips of local defects, some adjustment is required for parameters governing protection in the existing methods of protecting against stress corrosion damages. However experimental determination of the juvenile surface for all steels is impossible. This article deals with solving a problem of predicting the protective potential to prevent hull structures of ships and floating facilities against stress corrosion fracturing. The solving is performed by use of a computer assisted data analysis with intermediate prediction of reference parameters such as potential of steel with an oxide film on, and that of steel without any oxide film, for different steel grades and sea water salinities. The suggested approach allows improving quality of protective means of hull structures of ships and floating facilities against stress corrosion damages by stabilizing the cathodic polarization process, providing appropriate potential of the uncharged surface.
Algorithms for neurocomputer processing and storage of artificial neural networks
Authors: Romanchuk V A 
Published: November 2019

Abstract
We suggest some general principles and a universal open format for processing and storing artificial neural networks to be subsequently processed on the basis of neurocomputer devices of various architectures. To enhance this universalization, we choose to employ the ONNX format (Open Neural Network Exchange) and the Wolfram Language framework. In 2018, such repository of artificial neural networks was implemented. For functional convenience, storage of artificial neural networks and for using the web version, we chose the JSON technology.
On scheduling quality of precise resource measure sets which consist of tasks of circular type in GRID systems
Authors: Saak A E , Kureichik V V 
Published: November 2019

Abstract
To serve parallel tasks of multiple users of Grid systems require the development of efficient methods for allocating processors and time resources. Optimal resource management is practically unrealizable due to the exponential complexity. In the situation, when the Grid-system is modeled by the resource quadrant and the user’s task is represented by the resource rectangle, heuristic polynomial algorithms are proposed with the quality assessment of scheduling by a Non-Euclidean heuristic measure. Using the example of arrays with an exact resource measure and induced by partridge linings, the adaptation of level polynomial algorithms is investigated, and a comparative analysis of the proposed algorithms is carried out.
Functional degradation of cyber-physical aerial system for trajectory planning and agent tracking
Authors: Sayfeddine D 
Published: November 2019

Abstract
With the development of cyber physical systems, new methods were initiated to overcome failures in both cyber and physical domains. Failures can be numerous since the cyber side faces real-time execution problems and bugs in the algorithms. On the other hand, the physical parts such as actuators and sensors are in direct contact with the surroundings and their performance strictly depends on changing in the circumstances. Developing methods that can overcome a combined cyber-physical failure are of great importance for the survivability of autonomous systems. This paper addresses the functional degradation of UAV as a cyber physical system during the tracking process of a mobile agent using possible combinations of AI, optical odometry and range finding technics.
Influence of orientation of vertical crack of hydraulic fracturing treatment on the efficiency of reserve recovery
Authors: Shakurova Al F , Shakurova Ay F 
Published: November 2019

Abstract
The article presents the study results of the influence of the orientation of a vertical crack from hydraulic fracturing treatment on the efficiency of oil reserve recovery, indicating the crack propagation direction. It was found that the increase in initial recoverable reserves is the greater, the longer the crack length is, and if the crack is oriented parallel and perpendicular to the filtration flow down to the permeable zone in the stagnant or deadlock zone, then the perpendicular connecting current lines from the injection well to the recovery well is most effective. The presented results show that HFT significantly changes the conditions for the oil reserve recovery in general in the reservoir area. Therefore, it is relevant to assess the contribution of a single HFT to the oil recovery factor of the reservoir area, as well as its effect on the wells density grid.
Modelling of computational fluid dynamics of gas dynamic processes on longwall panel during underground mining of flat gassy coal multi-seam
Authors: Sidorenko A A , Ivanov V V , Sidorenko S A 
Published: November 2019

Abstract
In the paper, results of numerical modeling with use of a method of computational fluid dynamics of aerogasdynamic processes on the longwall panel of the coal mines during mining flat gassy coal multi-seam are presented. The three-dimensional aerogasdynamic model of the longwall panel developed by the authors is presented. Numerical research is conducted for conditions of flat thick seam mining in mine V.D. Yalevsky. As a result of research, the low efficiency of use of the vertical drainage goaf wells located from the headgate is established and recommendations about decrease in the number of wells for reduction of cost of their drilling are made. Results of the research can be used for justification of ventilation and gas drainage during gassy multi-seam underground mining.
Mathematical modeling of harmonic correction by parallel active filter in conditions of distributed generation
Authors: Sychev Yu A , Abramovich B N , Zimin R Yu , Kuznetsov P A 
Published: November 2019

Abstract
The methodology for selecting the parameters of a parallel active filter to compensate higher harmonics in a power supply system with distributed generation has been validated. The structure of the parallel active filter based on power transducer elements is proposed in the paper. A control system for the parallel active filter in conditions of power supply systems with distributed generation based on phase conversions and relay controllers with variable width of hysteresis has been developed. A mathematical model of the parallel active filter with the proposed control system in the power supply system with distributed generation has been developed. The dependences between the performances of higher harmonics compensation by the parallel active filter with the developed control system have been obtained according to the simulation results.