
Accepted papers
Developing of USDZ models for 3D digital analysis results visualization in augmented reality
R. I. Kadyrov
Accepted: 20210305
Abstract
The active development of augmented reality (AR) technologies in recent years lead to their increasing application in various fields of sciences. Especially the use of AR can be promising in areas where the results are represented in 3D, have complex shapes and it is often necessary to show them at different angles and zoom, such as digital rock analysis. One of the possible approaches is the creating of ARmodels in the open format of Universal Scene Description Zipped (USDZ), developed jointly by Apple and Pixar and currently supported by a huge number of different mobile devices. This 3D format is distinguished by advanced texturing based on Physically Based Rendering (PBR), the ability to support highpoly models, 3Danimation, sounds, creating complex scenes with the assignment of reactions to individual objects and ease of sharing using emails, messengers, and websites. This work briefly describes the basics of USDZ models including file structure, meshing, UV mapping and, texturing. It also discusses the methodology for ARmodels development based on the results of digital analysis using free software starting from CTscanning and finishing model exporting. In addition, the information about the limitations of USDZ models and prospects for the development of using USDZ models were provided. The results can be used for native demonstration of 3D research output, quick access and exchange the visual information, for exhibitions in museums and educational purposes. AR models make it easy to share with 3D visual results with people, which can be integrated into websites and used for the support of the scientific publications or native demonstrations on conferences.
Methods of visual graphicanalytical representation and search of scientific and technical texts
N.V. Maksimov, O.L. Golitsina, K.V. Monankov, A.S. Gavrilkina
Accepted: 20210304
Abstract
The technology of construction and visualization of the document full text semantic image, represented by the ontology as a system of three systems: functional, conceptual and terminological, is proposed. Names of entities and relations extracted from the text correspond to objects and connections of the functional system, descriptors of the subject area thesauri correspond to objects of the conceptual system. The problem of the variable representation of entities at the sign level is solved using the rules for the formation of phrases of different lengths. Functional relations are classified according to the taxonomy of functional relations and are used to construct aspect projections of ontologies. As the data model of the ontology, a labeled directed graph is used, which includes nodes and arcs of different types makes it possible to formalize operations on ontologies. Constructing the mapping of elements of ontology sets to graph elements in such way that elements of different sets of different systems are distinguishable, recognizable and depicted in different ways, allows to implement the principle of correspondence of the graphic image to the semantics of the visualized data.
Based on the search tasks typology, metaphors for visualizing the ontology graph are proposed: the “pathfinding” metaphor, characterized by the construction of a directed chain of facts, and the “neighborhood analysis” metaphor, which is characterized by the study of the fact environment (context).
The technology and software for constructing and visualizing an ontology graph, providing a variant visual representation, have been developed.
Examples of using the proposed models for information retrieval in document texts are given.
Visualization of power supply disturbances in telemedicine systems of mobile electrocardiography
Y.G. Gorshkov
Accepted: 20210301
Abstract
The article presents the continuation of the author's research in the field of visualization of biomedical signals in the development and operation of mobile systems of cardiology. Considered some of the latest guidelines for the developers of electrocardiographic equipment and recommendations for the frequency range of the ECG signal for standard clinical use. The negative impact on the analyzed signal of industrial frequency noise (power supply noise) is emphasized. Hardware and software solutions for the means of picking up and registering power supply disturbances are proposed, including a laryngophone headset with a smallsized condenser digital USB microphone and an audio editor. During the period 20102020, 1092 phonograms of acoustic biomedical signals of the heart, network interference and electromagnetic interference were recorded in various rooms. To solve the problems of visualizing power supply noises, the capabilities of the common sound editor Audacity were evaluated. Using the examples of the obtained spectral sections of signal sections with interference, the required timefrequency resolution was not achieved. The developed software WaveView and WaveViewMWA, which, due to the multilevel wavelet analysis of nonstationary signals, provide high frequencytime resolution and visualization of lowlevel interference are presented.
Experimental testing of the proposed visualization technology has confirmed its high efficiency. For the first time, a set of typical signals of power supply disturbances was obtained during registration of biomedical signals of cardiology in real operating conditions of mobile systems. An example of visualization of interference using the acustocard.ru portal in online mode is given.
Visualization of flows of a viscous conductive liquid with the presence of impurities in the flow field corresponding to exact solutions of the MHD equations
V. A. Galkin, A.O. Dubovik
Accepted: 20210225
Abstract
In this paper, it is considered a system of equations for the magnetic hydrodynamics (MHD), supplemented by the convectiondiffusion equation describing the flow a viscous conducting incompressible fluid taking into account the presence of impurities in it. Modern scientific visualization software, such as ParaView, provide a wide range of possibilities for visualization and, therefore, a clearer presentation of the structure of such flows, especially in threedimensional case. This opportunity allows to analyze, draw conclusions, note the features of the investigated fluid flows, and was actively used in the preparation of this publication.
This the MHD model is an active field of research for many scientists, however, the overwhelming most of the works are devoted exclusively to numerical modeling, and the study very little attention has been paid to exact solutions for these problems. The article discusses classes of exact solutions of the MHD equations and the associated convectiondiffusion equation. The found exact solutions can be used for verification developed numerical algorithms for solving the discussed problems. Moreover, the found exact solutions describe fluid flows in a porous medium and are related to the development of a core simulator that will allow to simulate intraplast effects. It is associated with the creation of a domestic technology "digital field" and the tasks of controlling the parameters of incompressible liquids. For the oil and gas industry, a solution of this class of task will allow to perform optimization effects of various types (mechanical, electromagnetic, thermal, etc.) in order to increase the oil recovery factor.
Simulation and visualisation of supersonic underexpanded jet interaction with a blunt body and periodic energy input
Ya.V. Khankhasaeva, A.L. Afendikov, A.E. Lutsky, I.S. Menshov, I.A. Znamenskaya
Accepted: 20210219
Abstract
The unsteady flow structure evolution during an interaction of supersonic under expanded jet, a blunt body and periodic energy input has been investigated using the free boundary method on multilevel Cartesian grids with local adaptation based on the wavelet analysis. The grid is restructured according to the various occurring discontinuities.
Periodic energy input first leads to an increase in body drag (due to energy source shockwave reaching the body) then to decrease to a level lower than if no energy input was present. A large amount of discontinuities and their interaction with each other can be observed. Due to the flow around the body being nonuniform (presence of under expanded jet and low pressure chamber), shock waves occurring from energy input become curved. Shock waves from previous energy inputs interact with those from the next ones and contact discontinuities, which results in structures similar to the Richtmyer–Meshkov instability.
The flow dynamics are illustrated with a series of images and animations which show the distribution of density and pressure, stream lines and mesh structure.
A Visual Analytic System for Exploring Consumer Clusters
PingHsuan Huang, YiJheng Huang, Li Huang, WenChieh Lin
Accepted: 20210219
Abstract
Consumer transactions analysis is a fundamental component for companies to build strong customer relationships and make good decisions. Visualization can help with such tasks. Existing visualization methods of transaction data analysis often focus on specific purposes, such as abnormal behavior detection and stock analysis. Most of current systems focus on analyzing timevarying transaction pattern and usually focus on analyze webscrape data. Few of them are used to analyze the shopping behavior of customer clusters in physical stores.In this study, we present a visualization system to facilitate the process of transaction data exploration. Our system focuses on functions of customer clustering and exploration of customer characteristics. A distribution view embedded in our system visually demonstrates consumer clustering generated by a dimensional reduction algorithm. The visual clusters allow analysts to explore the characteristics of customers in different clusters. In addition, the correlation hinting method provided by our system automatically highlights overlapping subsets of consumers.It can guide analysts to explore interesting customer clusters. In sum, our system helps analysts find customers with similar behaviors, observe characteristics of interesting subsets, and determine the correlation among data attributes. We validate our system with the consumer transaction data from our collaborating department store. Use cases are provided to show the usability of the system.
Minimal Surface Form Finding and Visualization by Stretched Grid Method
E.V. Popov, T.P. Popova
Accepted: 20210219
Abstract
Geometric and computational approach based on the theory of Stretched Grid Method (SGM) has been developed for the minimum surfaces form finding. For example, SGM is advantageous for engineering problem solution relative to an arbitrary tensile fabric structures design in comparison with other approaches. The SGM fundamental properties concerning convergence of the method and applicability were proved in this paper. The proof is based on the theorem about the first surface quadratic form behavior together with convergence to minimum surface area. An efficient computer procedure based on the approach described in this paper has been worked out. The procedure is included into CAD system aimed at fabric tensile structures designing.
On the development of aeroballistic experiment techniques for flow visualization
S.I. Gerasimov, V.I. Erofeev, V.A. Kikeev, K.V. Totyshev, E. G. Kosyak, P. G. Kuznetsov, R.V. Gerasimova
Accepted: 20201201
Abstract
The schemes of shadow rendering, supplementing the methodology of aeroballistic experiment, consisting in the ejection model, mounted in a special separable pallet, ballistic installation; the separation and capture of the pallet by the clipper; the span of the model with given initial conditions of motion speed and angle of attack on the measuring site aeroballistic tracks; contactless external trajectory registration model of the synchronous photographing models of digital cameras stereophotos, operating in standby mode on the background of reference marks of the coordinate reference system. Photographing takes place at the moment when pulsed light sources are triggered synchronously with the model's movement. Under these conditions, shadow visualization schemes are functional, which represent an upgraded method of a luminous point using a protective lens, a combined method that includes registration in passing light using a camera with an electronoptical shutter, and a shadow background method. Typical registration patterns are given.
The Testing and Visualization of the Singularities of the Mutual Intersection of a Tetrahedron and a Quadric (Chasles' Theorem)
A. L. Kheyfets
Accepted: 20201009
Abstract
This article presents the results of the experimental research and testing of Chasles’ historical theorem. The theorem shows the singularities of the intersection of an arbitrary tetrahedron and an arbitrary quadric (secondorder surface). The need for testing is preconditioned by the absence of a proof of the theorem and the complexity of its perception in Chasles’ version.
The experiments included the construction, visualization, and study of 3D computer models using AutoCAD and SolidWorks. All forms of quadrics are considered in their different relative positions to the tetrahedron. The experimental procedure is considered in detail and the accuracy of the results is estimated. The author tested all the intersection variants given in the theorem: the edges intersect a quadric, the vertices belong to a quadric, the edges are tangent to a quadric, the faces are tangent to a quadric, etc. The experiments confirmed the scientific novelty of the theorem, which is that four intersecting straight lines drawn according to the algorithm of the theorem belong to the surface a single onesheeted hyperboloid.
The paper investigated in detail the form of the theorem when the planes drawn through the edges of a tetrahedron are tangent and enclose the quadric. It shows that there are 4,096 combinations of plane positions. Only 64 of these combinations, obtained using AutoLisp, lead to the realization of the theorem. This conclusion supplements the theorem.
The results differ from the theorem in two forms. The paper presents a proof of one of the theorem forms, although a universal proof of the theorem has yet to be developed. The models and algorithms can be used when teaching computer geometric simulation.


