bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation of edge detection methods using the example of wave field pattern image
Authors: Yakimenko A A , Makfuzova A I 
Published: January 2021

Abstract
This article explores the methods of detecting boundaries in images of wave field patterns. As a result, an application for image processing was developed using Sobel, Prewitt, Roberts, Gabor and Canny filters and experiments were carried out to detect the edge on images of wave field patterns. In conclusion, the quantitative and qualitative characteristics of the filters were presented, and a conclusion was made on the selection of the boundary detection filter. The results of this study will be used in the study of the neural network neocognitron for the recognition of geological and physical models of environments (GPME). This work was supported by the RFBR grant No. 19-07-00170.
Functioning of back-to-back high voltage direct current link model in Tomsk electric power system
Authors: Maltsev A P , Rudnik V E , Malkova Y Yu , Ufa R A 
Published: January 2021

Abstract
In this article the research results of steady-state and dynamic performance of asynchronous back-to-back HVDC link in Tomsk electric power system are presented. It is proposed to use the back-to-back HVDC link to provide an asynchronous link for parallel operation of the North and South parts of Tomsk electric power system. The steady-state stability limit and maximum allowed power flow were defined. Based on this the more effective location and power of back-to-back HVDC link were determined. Therefore, it is shown the application of back-to-back HVDC link decreases the level of short-circuit current, power fluctuations and increases the stability of load operation, especially of motor load at substation.
Preparation and properties of composite material based on hafnium diboride and aluminum
Authors: Belyakovich S A , Mostovshchikov A V , Ilyin A P , Gubarev F A 
Published: January 2021

Abstract
Hafnium diboride (HfB2) in aluminum matrix (Al) material was prepared by diffusion sintering of a mixture of hafnium diboride and aluminum micropowders. The effect of the hafnium diboride content (HfB2) in the aluminum matrix (Al) on sintering characteristics and properties of the samples is presented. The effect of microwave activation of the aluminum powders has been established. The diffusion sintering behavior was concluded. The material properties and structure were defined.
Development of impulse method for transformer winding condition control technology
Authors: Mytnikov A , Lavrinovich A , Strugov V , Saqib M 
Published: January 2021

Abstract
Mechanical shift of windings is serious problem of power transformers which belong to the very significant components of power engineering system. Mechanical displacements and following insulation failure due to short circuit and inrush currents can lead to an emergency situation. That’s why the effective control technology of windings is an relevant task of a current power engineering. A new approach to winding state control technology is described in the paper. The described technology is based on nanosecond probing impulse duration with short (no more than 20 ns) rapidness of front impulse. The experimental results of sensitivity growth at decreasing front pulse duration are shown. The experimental equipment and research are described. It is established that duration of probing impulse has optimum value around 100ns. It is shown that it is possible to do a condition control under operating voltage. It is shown that both shorter probing impulse and front of probe pulse duration allows upgrading common effectiveness of the diagnostic technology.
Megawatt PV-diesel power stations in the Arctic
Authors: Dmitrienko V N , Lukutin B V , Popov M M 
Published: January 2021

Abstract
The work of hybrid energy complexes of significant installed capacity based on photovoltaic and diesel generation in the northern regions of Yakutia is considered. The considerable remoteness of settlements from the country’s central energy system, the cargo delivery inaccessibility, as well as extreme climatic conditions determines the use of a hybrid energy complex with continuous diesel generation (without energy storage use).
Automated filtering and polygonal reconstruction of virtual skull model based on computed tomography
Authors: Grif M G , Grif A M 
Published: January 2021

Abstract
A method of automated filtering and polygonal reconstruction of the skull virtual model using the methods of “Marching cubes” and “Connected component labeling” is considered. An algorithm for effective software implementation is described. A computational experiment on computed tomography data consisting of 244 DICOM images is presented. The experimental results confirm the correctness and computational efficiency of the algorithm.
The calculation of the campaign of reactor RITM-200
Authors: Savitsky D E , Kuzmin A V 
Published: January 2021

Abstract
In this paper, the campaign of RITM-200 reactor was calculated. The duration of the campaign was determined taking the net capacity factor into consideration. The calculated duration concurred with the known data. The neutron parameters were calculated using the effective temperature method. The presence of burnable absorber rods was taken into account. Their effect was considered using the diffusional approach. The iterative computations were used to finally determine the temperature of the neutron gas. At the end, the reactivity curve displaying different effects inside fuel, namely fuel and gadolinium burn-out, the poisoning and slagging was drawn.
Whole blood clotting time assessment by method of laser-speckle correlation
Authors: Liushnevskaya I D , Li L , Gubarev F A , Nosarev A V , Gusakova V S 
Published: January 2021

Abstract
The paper presents the results of study of the coagulation process of the whole blood with anticoagulant using the method of laser speckle correlation. The clotting time dependence curves of the correlation coefficient have been presented and discussed. Analyzing the changing trend of these curves is possible to assess the clotting time, which prove the capability of using the method of laser speckle correlation for determining the diseases of blood coagulation.
Analysis of barriers to the development of Industrial Internet of Things technology and ways to overcome them
Authors: Zhmud V , Liapidevskiy A , Avrmachuk V , Sayapin V , Stukach O , Roth H 
Published: January 2021

Abstract
As is known, in 2019 the national program “Digital Economy of the Russian Federation” was launched. In the first phase, nine roadmaps were developed, of which six were approved by the Prime Minister. Participation in the development of these roadmaps provides a fresh perspective on some particular problems. The authors reveal some details of the approach to the implementation of the “Industrial Internet of Things” direction. Some specific differences of the industrial Internet from the regular Internet are discussed using examples. Some conclusions are drawn about the directions for further research in this area.
Method for numerical optimization of the parameters of regulator from unstable condition
Authors: Voevoda A A , Romannikov D O 
Published: January 2021

Abstract
The task of selecting the values of coefficients for a given controller structure from the initial unstable position is considered using the methods of numerical optimization. A method is proposed which consists in correcting the error function which is used for optimization. The main idea is multiplication by the exponent in the degree of the simulation step which the convergence of the transition process is achieved. After reaching convergence, you can perform numerical optimization. It is recommended to reduce the value of the exponent so that the figure of the transition process remains convergent. Further, when a stable transition process is reached, the value of the exponent should be zeroed out and then the optimization procedure for the error of the transition process should be performed without adjusting it until the change in the value of the objective function changes less than the specified threshold value. An example of such optimization is considered on the example of the transfer function of a second order oscillator.
High-level architecture for a digital oilfield: features of the transition to data-driven decision management
Authors: Savelev A O 
Published: January 2021

Abstract
This paper is devoted to the design of a distributed heterogeneous data warehouse of a digital oilfield. With increasing amounts of data collected from intelligent controllers and sensors, the lack of mechanisms for combining data from different sources and providing them to consumers affect the overall management efficiency. In addition, without it is impossible making the next logical step – the effective application of intelligent analysis methods. The paper describes the high-level architecture, as well as subsystems of operational management and decision support. The presented data are intermediate results of the project “Digital oilfield heterogeneous distributed data warehouse for informational support of decision-making processes”.
Dielectric particle-based strategy to design a new self-bending subwavelength structured light beams
Authors: Minin I V , Minin O V 
Published: January 2021

Abstract
During last 2 years it was shown that an electromagnetic field can be made to curve after propagation through a simple dielectric material of special shape, which adds a new-found degree of simplicity. This effect was termed ‘photonic hooks’ – it is an unique electromagnetic beam configuration behind a mesoscale dielectric particle with a broken symmetry and differ from Airy-family beams. PH features the radius of curvature, which is about 2 times smaller than the electromagnetic wavelength – this is the smallest curvature radius of electromagnetic waves ever reported. The nature of a photonic hook is in dispersion of the phase velocity of the waves inside of particle, resulting in interference. Here, we report a new dielectric particle-based strategy to design self-bending subwavelength structured light beams.
The possibility of obtaining materials by plasma dynamic synthesis in the Ti-O system
Authors: Sivkov A A , Vympina Yu N , Rakhmatullin I A , Ivashutenko A S , Shanenkova Yu L 
Published: January 2021

Abstract
The possibility of obtaining a dispersed material by the method of plasma dynamic synthesis in the Ti-O system is shown. The plasma dynamic synthesis is based on the operation of a pulsed high-current coaxial magnetoplasma accelerator with titanium electrodes. The obtained product was investigated by X-ray diffraction method and transmission electron microscopy. The results showed the presence of two main titanium oxide (IV) crystalline modifications: anatase with tetragonal syngony and rutile also with tetragonal syngony. Moreover, the dominant modification is anatase in synthesized material.
Automated anomalies detection in the work of industrial robots
Authors: Goncharov A , Savelev A , Krinitsyn N , Mikhalevich S 
Published: January 2021

Abstract
This article describes the results of the anomalies automated detection algorithm development in the operation of industrial robots. The development of robotic systems, in particular, industrial robots, and software for them is ahead of the tracking and managing technologies development. The operation of the digital production system involves the generation of a large amount of various data characterizing the state of both the specific equipment and the industrial system as a whole. Such a system produces a sufficient amount of data to develop machine learning models to analyse this data to solve problems such as forecasting and modelling. As part of the study, an experiment was conducted based on the equipment of the laboratory of industrial robots of Tomsk Polytechnic University. In the course of the research, the industrial manipulator moved loads belonging to different classes by weight. An algorithm was developed for the automated analysis of the values of the parameters of the consumed current and the position of the manipulator.
On the self-testing (m,n)-code checker design
Authors: Butorina N , Burkatovskaya Yu , Pakhomova E 
Published: January 2021

Abstract
We propose an approach to a self-testing (m, n)-code checker design, based on subdividing the set of all code words into special subsets called segments. The checker circuit is constructed by using one- and two-output configurable logic blocks (CLB). Previously, in each output of a CLB, a function representing exactly one segment was implemented. In the proposed approach, at each CLBs output, it is possible to implement functions that represent several segments and to provide the self-testing property. It allows reducing the number of CLBs and simplifying the circuit of the checker.
Statistical techniques to determine of optimal and acceptable noise levels
Authors: Balabanova I S , Kostadinova S S , Markova V I , Sadinov S M , Georgiev G I 
Published: January 2021

Abstract
The paper presents an approach for an application of QoS procedures, on noise impacts in communications, respectively Uniform White Noise (UWN), Gaussian White Noise (GWN), Bernoulli Noise (BN) and Poisson Noise (PN). The approach consists in experimental establishment of recommended optimal and acceptable limit levels of the noise indicator Root Mean Square based (RMS) on the processing of registered information sets for each specific noise. A set of methodological statistical procedures are applied to the experimental data with respect to the complete and individual input sets (RMS levels for each individual noise). Types of family characteristics are analyzed and evaluated about different quality indicators as “Mean Plot of multiple variables”, “Normal Probability Plots”, “Individual Plots”, “X-Bar and R char variable”, “Capability Plots” and “Capability Histograms”. The approach is also associated with the detection of RMS samples with deviations outside the defined statistical levels, as well as their exclusion in order to improve the quality of the processed information sample.
Evolution of mobile networks and seamless transition to 5G
Authors: Ivanova E P , Iliev T B , Stoyanov I S , Mihaylov G Y 
Published: January 2021

Abstract
The evolution in mobile networks continues with the next 5G technology, which is already released in 2020, and also has a distinct advantage from its predecessor. This difference also results in measurements of Quality of Service (QoS) and Quality of Experience (QoE) which are very diverse because there is no specific standard on 5G technology. This paper gives a review of an approach in the measurement as part of the process of QoS and QoE. In addition, this paper provides measurements on how to predict the availability of new 5G. The measurement process is related to the location and conditions, where 5G technology will be implemented.
Conceptual framework for quality assessment in human-centric 6G XR services
Authors: Stoynov V , Ivanov A , Mihaylova D 
Published: January 2021

Abstract
The 6G communication networks and technologies have to enable the development of wide variety of low latency and ultra-reliable services. Furthermore, the 6G is foreseen to be the era of new devices which integrate our natural human senses in order to create a fully new concept of human-machine interactions. The eXtended Reality (XR) based wearables will surely improve the way we collaborate with modern technologies by merging the real and virtual world in one innovative continuum in order to expand the possibilities of using and interacting with different types of modern or already well-known IT services. In this context, a vital 6G research area is the design of different flexible quality assessment metrics, targets and measures that integrate human perceptions and physical factors from human physiology. This metric design should consider the multisensory nature of XR devices by incorporation of different objective network-related as well as strongly subjective human-related features like sight, touch, smell, taste, body physiology, psychological traits, gestures and even sixth sense. In this paper a conceptual framework incorporating a mixture of new and classical quality assessment constructs like Quality of Service (QoS) and Quality of Experience (QoE) is proposed for 6G networks from human-centric point of view. It considers the development of new types of intelligent XR technologies and give an insight in regard to overall human experience assessment, modelling and prediction.
Energy detectors performance evaluation for interweave cognitive radio network scenario in 5G
Authors: Ivanov A , Stoynov V , Mihaylova D , Poulkov V 
Published: January 2021

Abstract
With the recent advances in resource allocation methods for 5G heterogeneous networks and dynamic spectrum access, the convergence between them becomes a more prevalent topic in scientific research. By implementing cognitive functionalities in the 5G network’s nodes, its efficiency can be improved and, in addition, the integration with existing wireless standards will be smoother. To enable this, the intelligent sensors are required to achieve rigid detection accuracy. Thus, the purpose of this paper is to examine the ability of popular energy detection spectrum sensing techniques to identify the primary user’s signal in an interweave (autonomous operation of the secondary users) 5G deployment scenario. This evaluation is performed through comprehensive simulations for differing number of primary and secondary users, and for different data stream types transmitted by the primary base station.
An overview of methods to combat eavesdropping in NOMA-based networks through physical layer security
Authors: Mihaylova D , Stoynov V , Ivanov A , Valkova-Jarvis Z 
Published: January 2021

Abstract
Thanks to their potentials in providing reliable communications for a large number of devices, 5G non-orthogonal multiple access (NOMA) techniques have recently been the subject of considerable research interest. Accordingly, research of Physical Layer Security approaches in NOMA is essential. A primary purpose and challenge for security at the physical level of NOMA-based systems is to protect the information transmitted against both external and internal eavesdropping attacks. To this end, it is necessary to develop PLS schemes which allow each user to decode the signals transmitted by other users, thus guaranteeing normal operation of the successive interference cancellation, while also providing privacy of the information exchange. In this paper, different types of eavesdropping are studied and a summary of existing approaches to improve security at the physical layer in 5G NOMA networks is provided.
Selection of countermeasures against propagation of harmful information via Internet
Authors: Vitkova L A , Pronichev A P , Doynikova E V , Saenko I B 
Published: January 2021

Abstract
Today, Internet allows accessing and propagation various information. Some of this information can be undesired for particular user or even harmful. While there are quite a large number of systems to respond to unwanted and harmful information and some well-established set of countermeasures, such as filtering, blocking access, and notification, existing systems are often based on one type of countermeasures. From our point of view, there is a need for the technique of automated selection of optimal countermeasures to counteract undesired or harmful information on the Internet depending on the type of such information and characteristics and needs of the protected system. In this paper we propose the set of interconnected models, including threat model, countermeasure model and information object model, and countermeasure selection technique for protection against harmful information in Internet using these models. The proposed technique uses single-criteria optimization on the basis of introduced countermeasure selection index and allows selecting applicable and optimal countermeasures for the particular system from specific threats. The application of the technique is demonstrated on the experiments.
Software-defined wireless urban network
Authors: Streltsov O V , Birka Y G , Gnatenko V Y , Sytnikov V S , Stupen P V 
Published: January 2021

Abstract
Software-defined wireless urban network (SD-WUN) is a new network subclass for implementation in the “Smart City” project. SD-WUN can be offered as a single technical solution, built based on the most relevant technologies in the world of computer networks and the Internet. The theoretical model of existing technological solutions interaction is one of the best ways to eliminate the problems of the “Smart City” project mentioned in the work and offers one of the possible ways of its development in the future. The analysis is based on assessments of the prospects for the development of existing methods for implementing computer network nodes and the Internet of things (IoT), and their comparison with each other. One of the most pressing problems of the “Smart City” project implementation is the best choice from the point of view of network technologies. An urgent problem in the field of network technologies is the problem of the transition of network addressing from the IPv4 address space to IPv6. It is obvious that the Smart City project is associated with the popular IoT technology (Internet of Things) due to the progression of the number of devices. Another key point is the need to implement a project based on a high-speed wireless network, excluding wired switching. It is obvious that the network should possess such properties as security, distribution of computing resources, high data transfer speed and ease of use and support of the network.
Solar energy potentials in different climatic zones of Nigeria
Authors: Ogunjo S T , Obafaye A A , Rabiu A B 
Published: January 2021

Abstract
Solar energy is the cleanest and most abundant renewable energy available in Nigeria, a tropical nation. It is also a viable tool for solving most of our problems ranging from desertification to climate change. This study investigated the solar energy potentials at different climatic zones of Nigeria using four representative locations. Surface temperature and solar radiation measurements retrieved from the study locations were analyzed to obtain the potential power output from solar power systems. It was shown that the monthly mean output power from the solar power systems is affected by seasonal changes for the four locations under study. We also concluded that the increasing temperature is a critical factor limiting the PV production in Nigeria.
The comparison of five proton linac beams in order to set up a thermal neutron radiography installation
Authors: Fantidis J G , Nicolaou G E , Tsakalos G , Thysiadou A 
Published: January 2021

Abstract
Radiography without doubt is maybe the most famous non-destructive technique with many applications in a number of scientific fields. In the present study, the performance of five photo-neutrons which delivered by proton linear accelerators with energy equal with 8, 12, 16, 20 and 24 MeV for a thermal neutron radiography unit has been designed and simulated with the help of the MCNPX 2.5.0 software which based on the Monte Carlo statistical method. The geometrical arrangement of the unit has been simulated with primary goal to provide the highest thermal neutron flux in the location of the examined item. For every energy of the proton beam all the significant parameters with the thermal neutron radiography theory like the flux of the thermals neutrons, the (collimator length)/(aperture diameter) ratio and the percentage of the thermal neutron within the neutron beam simulated for a wide series of values. Owing to the fact that the there are many fast neutrons inside the beam, it is obligatory to decrease the quantity of the fast neutrons. For this reason, the addition of a single sapphire for fast neutron filtering has as a consequence a neutron beam with better quality. According to the simulations, the presence of the filter improves the % presence of the thermal neutrons with no substantial abatement in the flux of the slow neutrons.