Software & Systems

Articles of journal № 3 at 2022 year.

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21. Developing a system for managing student’s professional development based on his digital footprint [№3 за 2022 год]
Authors: Boganyuk Yu.V., Vorobeva M.S., Zakharova I.G.
Visitors: 1510
Most existing information systems in universities lack the possibility to analyze a student's work in de-tail. Such analysis should include student's report texts, implemented projects and a program code that make up student digital footprint. The authors have developed an intelligent system that solves these problems. The system is represented by a set of modules for monitoring, managing and predicting the professional development of a student as an IT specialist using Big Data and Data mining technologies. The development takes into account the features of the current process: for example, several infor-mation systems and file storages in the university, various roles of internal and external users, users’ needs and problems that they face in the process of work and learning. One of the key elements of the system is a multi-level data storage, which consists of two components: a relational database and a NoSQL storage. The system is focused not only on the academic performance analysis, but also on text documents produced both by the students themselves and documents regulating their educational tra-jectory. The developed system allows expanding the ability to make decisions in the educational process management at every level (student, teacher, university administration) through applying modern data mining methods and technologies to the less studied part of the student's digital footprint. In addition, the developed system gives new opportunities for interaction between a university and employers and applicants. The system was tested using the data of students of the Institute of Mathematics and Com-puter Science of the Tyumen State University.

22. Solving the problem of electromagnetic wave diffraction on arbitrary shape screens using CUDA [№3 за 2022 год]
Authors: Giniyatova D.Kh., Markina A.G.
Visitors: 1992
The paper considers the algorithm for solving the problem of electromagnetic (EM) wave diffraction on flat arbitrary shape screens using the CUDA parallel programming technology. The problem is formulated as an integro-differential equation and solved by the method of moments (Galerkin method). The authors have chosen RWG functions as basis and testing functions. They have developed a simple and fast algorithm for triangulating a domain with an arbitrary boundary to con-struct the corresponding RWG elements on GPU. Numerical results were presented for the diffraction problem on canonical and complex shape screens. The obtained solution is in good agreement with the results of the previous studies. The paper also presents a comparative analysis of the execution time of serial and parallel algo-rithms. It is shown that the use of CUDA technology significantly speeds up the solving of the problem of EM wave diffraction on flat metal arbitrary shape screens.

23. Structuring natural text entities using neural networks for generating 3D-scenes [№3 за 2022 год]
Authors: Kozar B.A. , Kugurakova V.V., Sakhibgareeva G.F.
Visitors: 2833
The subject of this study is the automation using neural networks of the process of assembling three-dimensional scene, which can be used both to generate three-dimensional scenes or locations in com-puter games from a textual description, and to prepare sequences of three-dimensional synthetic data. This topic is relevant for developing three-dimensional graphics including interactive projects – games, simula-tors, AR/VR applications. After analyzing and comparing the results obtained in a number of well-known completed projects, the authors determine technologies and software libraries, which allow effectively achieving the de-sired goal - to provide fast assembly of three-dimensional scenes filled with objects according to the text description. Thanks to synthesis of the best solutions, it was possible to create an optimal concept that allows achieving quick and qualitative result with the right rules of building geometrical relations between scene objects. There is a formed list of requirements to the designed tool and its architecture. Input data for using this tool is a text in natural language; output data is a scene with objects corre-sponding to the description used. The main result achieved is a finished software tool for Unreal Engine developed on the basis of the nlp-ue4 neural network and the set of tensorflow, nltk, pandas, gensim, h5py libraries. The readiness of the tool is evaluated as a prototype solution, which can be integrated into the drafting stage of interac-tive projects with three-dimensional graphics. To evaluate the created tool effectiveness objectively, the authors have conducted the experiments that proved that its use even in the current version significantly reduces development time and does not require a user to have skills in programming or creating three-dimensional graphics. There is also a discussion about the research development prospects.

24. A rehabilitation simulator for patients with hand mobility problems using virtual reality technologies [№3 за 2022 год]
Authors: Aglyamov F.R. , Kugurakov V.S.
Visitors: 2729
A hand is one of the most important parts of the human body; its injuries seriously affect even normal activities. Thus, restoring the hand function and mobility is one of the most complex and important top-ics for normal daily life. The subject of this study is a hardware-software simulator complex to reha-bilitate patients with hand mobility disorders using virtual reality technology. The topic is relevant due to a higher level of patient’s interest and motivation, which can potentially increase the interest and ef-fectiveness of rehabilitation procedures. The authors have analyzed modern motion modeling methods, as well as the use of a virtual reality technology for rehabilitation and tracking changes in motor functions of patients with cognitive prob-lems. The result of the study is a prototype glove and software for collecting information about the finger flexion degree, as well as a set of exercises for a patient and rehabilitation progress recordings for fur-ther analysis. The paper presents a possible architecture option for integrating the reading glove with modern VR systems. Practical relevance relates to the introduction of an experimental method for rehabilitation, the ef-fectiveness of which has been proven theoretically and will probably be effective in practice, which is planned to be proven later. Section 6 outlines further plans for the glove development, as well as the addition of functionality to the rehabilitation application.

25. Remote control of a robotic device using virtual reality [№3 за 2022 год]
Authors: Kugurakova V.V., Khafizov M.R. , Kadyrov S.A. , Zykov E.Yu.
Visitors: 3020
The subject of this paper is the possibility of remote control of a robotic device using the virtual reality technology. This concept is being developed in order to create a more native way to control a device remotely, as well as a more convenient image transmission for an operator, which is especially relevant in extreme situations. The paper presents the analysis of intelligent control system technologies and the examples of im-plementing virtual reality technologies in tele-robotics. This helped to highlight the overall structure of the remote control system and to show the main implementation problems of this project. This analysis has become a base for development and implementation of a universal hardware and software telecon-trol platform on the Unity platform. The paper presents the application architecture and considers the requirements initially imposed on it in order to bypass the wireless channel limitations in the task of the real-time robot control using VR headsets. There is an implemented control system for selecting the direction of moving a robotic unit using one of the VR controllers. The paper considers implemented algorithms for obtaining high-quality stereoscopic vision in virtual reality devices, as well as the technique for synchronizing the re-mote rotation of a stereo pair. Moreover, there is a description of a command transmission system. The experiments of the implemented system were conducted in order to verify if it meets the neces-sary requirements to obtain the proper quality. The authors have measured the response time of the system and minimized the delay in the communication channel. The developed software for robotic unit telecontrol using a virtual reality headset provides the pos-sibility of stable telecontrol of remote robotic equipment.

26. A filtration model and parallel computing of the blood flow characteristics in the circulatory system in case of an occluding circular clot [№3 за 2022 год]
Authors: Konyukhov V.M., Khramchenkov M.G., Konyukhov I.V.
Visitors: 2313
The authors have mathematically described the blood flow in the circulatory system based on the gen-eral filtration equations at the presence of an occluding circular porous clot located on the vessel wall, taking into account clot destruction under the action of hydrodynamic forces. The change in the inter-nal forces occurring in the clot material leads to forming an inhomogeneous permeability distribution, which is a function of spatial coordinates and time. Under the assumption of a symmetric toroidal shape of the thrombus, the paper considers a flat two-dimensional problem in the cross section of the vessel and a clot. The authors have developed finite-difference schemes and iterative algorithms using parallel com-puting technologies to solve corresponding two-dimensional problem in a blood vessel and a blood clot with heterogeneous permeability. They have also carried out parallelization at the visualization of the hydrodynamic characteristics of the flows. The software package with the implemented numerical and algorithmical models enables computational experiments with simultaneous visualization of their re-sults. There is the analysis of the influence of the shape and the structure of a clot formed at the blood vessel wall on the main hydrodynamic characteristics determining the probability of a clot breakage from the wall. It is shown that the most dangerous are the blood clots which boundary forms an acute angle with the vessel wall. This is caused by to two factors: the occurrence of the rotary moment of the forces tending to the break of the blood clot front edge down the vessel wall, as well as by the action of a local pressure gradient at the clot base, which significantly exceeds the pressure gradient in the vessel outside the blood clot. At the same time, the clot permeability affects the total pressure drop and the maximal pressure gradient magnitude, but it practically does not change the direction of the fluid flow in the blood vessel.

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