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Three New Monotypic Genera of the Caloplacoid Lichens (Teloschistaceae, Lichen-Forming Ascomycetes)
( Sergii Y Kondratyuk ),( Laszlo Lokos ),( Jung A Kim ),( Anna S Kondratiuk ),( Min Hye Jeong ),( Seol Hwa Jang ),( Soon Ok Oh ),( Jae Seoun Hur ) 한국균학회 2015 Mycobiology Vol.43 No.3
Three monophyletic branches are strongly supported in a phylogenetic analysis of the Teloschistaceae based on combined data sets of internal transcribed spacer and large subunit nrDNA and 12S small subunit mtDNA sequences. These are described as new monotypic genera: Jasonhuria S. Y. Kondr., L. Lokos et S. -O. Oh, Loekoesia S. Y. Kondr., S. -O. Oh et J. -S. Hur and Olegblumia S. Y. Kondr., L. Lokos et J. -S. Hur. Three new combinations for the type species of these genera are proposed.
Polarization Precession Effects for Shear Elastic Waves in Rotated Solids
Sergii A.Sarapuloff(세르게이 사라플로프) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
Developments of Solid-State Gyroscopy during last decades are impressive and were based on thin-walled shell resonators like HRG or CRG made from fused quartz or leuko-sapphire. However, a number of design choices for inertial-grade gyroscopes, which can be used for high-g applications and for mass- or middle- scale production, is still very limited. So, considerations of fundamental physical effects in solids that can be used for development of a miniature, completely solid-state, and lower-cost sensor look urgent. There is a variety of different types of bulk acoustic (elastic) waves (BAW) in anisotropic solids. Shear waves with different variants of their polarization have to be studied especially carefully, because shear sounds in glasses and crystals are sensitive to a turn of the solid as a whole, and, so, they can be used for development of gyroscopic sensors. For an isotropic medium (for a glass or a fine polycrystalline body), classic Lame’s theorem (so-called, a general solution of Elasticity Theory or Green-Lame’s representation) has been modified for enough general case: an elastic medium rotated about an arbitrary set of axes. Travelling, standing, and mixed shear waves propagating in an infinite isotopic medium (or between a pair of parallel reflecting surfaces) have been considered too. An analogy with classic Foucault’s pendulum has been underlined for the effect of a turn of a polarizational plane (i.e., an integration effect for an input angular rate) due to a medium’s turn about the axis of the wave propagation. These cases demonstrate a whole-angle regime of gyroscopic operation. Single-crystals are anisotropic media, and, therefore, to reflect influence of the crystal’s rotation, classic Christoffel-Green’s tensors have been modified. Cases of acoustic axes corresponding to equal velocities for a pair of the pure-transverse (shear) waves have of an evident applied interest. For such a special direction in a crystal, different polarizations of waves are possible, and the gyroscopic effect of “polarizational precession” can be observed like for a glass. Naturally, formation of a wave pattern in a massive elastic body is much more complex due to reflections from its boundaries. Some of these complexities can be eliminated. However, a non-homogeneity has a fundamental nature for any amorphous medium due to its thermodynamically-unstable micro-structure, having fluctuations of the rapidly-frozen liquid. For single-crystalline structures, blockness (walls of dislocations) plays a similar role. Physical nature and kinematic particularities of several typical “drifts” in polarizational BAW gyros (P-BAW) have been considered briefly too. They include irregular precessions (“polarizational beats”) due to: nonhomogeneity of mass density and elastic moduli, dissymmetry of intrinsic losses, and an angular mismatch between propagation and acoustic axes.
Sergii A. Sarapuloff(세르게이 사라플로프),Huinam Rhee(이희남),Sang-Jin Par(박상진) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
Modern solid-state gyroscopes (HRG) with hemispherical resonators from high-purity quartz glass and special surface superfinishing and ultrathin gold coating become the best instruments for precise-grade inertial reference units (IRU) targeting long-term space missions. Designing of these sensors could be a notable contribution into development of Korea as a space nation. In participial, 40mm diameter thin-shell resonator from high-purity fused quartz, fabricated as a single-piece with its supporting stem has been designed, machined, etched, tuned, tested, and delivered by STM Co. (ATS of Ukraine) several years ago; an extremely-high Q-factor (upto 10~20 millions) has been shown. Understanding of the best way how to match such a unique sensor with inner glass assembly of the gyro means how to use the high potential in a maximal extent; and this has become the urgent task. Inner quartz glass assembly has a very thin indium (In) layer soldered the resonator and its silica base (case), but effects of internal resonances between operational modal pair of the shell-cup and its side (parasitic) modes can notable degrade the potential of the sensor as a whole, instead of so low level of resonator’s intrinsic losses. Unfortunately, there are special combinations of dimensions of the parts (so-called, “resonant sizes”), when intensive losses of energy occurs. The authors proposed to use the length of stem’s fixture as an additional design parameter to avoid such cases. So-called, a cyclic scheme of finite element method (FEM) and ANSYS software were employed to estimate different combinations of gyro assembly parameters. This variant has no mismatches of numerical origin due to FEM’s discrete mesh. The optimum length and dangerous “resonant lengths” have been found. The special attention has been paid to analyses of 3D effects in a cup-stem transient zone, including determination of a difference between the positions of geometrical Pole of the resonant hemisphere and of its “dynamical Pole”, i.e., its real zone of oscillation node. Boundary effects between the shell (cup) and 3D short “beams” (inner and outer stems) have been ranged. The results of the numerical experiments have been compared with the classic model of a quasi-hemispherical shell band with inextensional midsurface, and the solution using Rayleigh’s functions of the 1<SUP>st</SUP> and 2<SUP>nd</SUP> kinds. To guarantee the truth of the recommended sizes to a designer of the real device, the analytical and FEM results have been compared with experimental data for a party of real resonators. The consistency of the results obtained by different means has been shown with errors less than 5%. The results notably differ from the data published earlier by different researchers.
Prylipko, Sergii,Vasylieva, Nataliia,Kovalova, Olena,Kulayets, Mariia,Bilous, Yana,Hnatenko, Iryna International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.11
The article proposes a method of modeling a comprehensive indicator for evaluating the effectiveness of regional management of innovation activity. This will make it possible to assess the effectiveness of personnel, financial and credit and foreign economic activity of the regions from the standpoint of an integrated approach. The modeling technique is proposed to be carried out using the tools of taxonomic analysis and the calculation of a complex indicator of the effectiveness of the innovation activity management.
Chyrchyk, Sergii,Rudencenko, Alla,Livshun, Oleksandr,Poltavets-Guida, Oksana,Poltavska, Yuliia,Tymenko, Volodymyr International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.10
In modern socio-cultural conditions, the requirements for the quality of professional training of graduates of higher educational institutions are increasing. This issue has become especially acute with the advent of pandemic conditions. The ability to apply the existing competencies in the situation of challenges of the 21st century to solve complex social and professional problems is an important criterion for the quality of higher education. Modern professional art education is undergoing many reforms and transformations. Particular attention is paid to innovative teaching methods, thanks to which future specialists experience the breath of innovative education. This issue is especially relevant during the spread of the COVID-19 pandemic. Since students of creative specialties must also have certain competencies, within the framework of the educational process, the competence-based approach to teaching plays a key role, is the methodological basis in the system of modernization of higher professional art education. Thus, the main task of the study is to analyze the process of formation of professional competence among students of art institutions of higher education in the context of COVID-19. As a result of the study, the main aspects of the process of formation of professional competence among students of art institutions of higher education in the context of COVID-19 were investigated.
Solntsev, Sergii,Smerichevskyi, Serhii,Skyba, Halyna,Zabashtanska, Tetiana,Bazaliyska, Natalia,Kolbushkin, Yuriy International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.2
The article defines the principles of formation of digital marketing strategy of enterprises in the conditions of intensification of competition on the international market. The stages of development of digital marketing strategy of enterprises in the conditions of intensification of competition in the international market are substantiated, which includes: setting goals, which envisages observance of the principles of SMART-scheme; product or service analysis; monitoring of competitors; analytics of definition and segmentation of the target audience of the enterprise; selection of digital marketing tools and channels for promotion on the international market of products or services; formation of a unique, unique trade offer, selection of indicators for evaluating the effectiveness of digital marketing strategy and its tools. It is proved that according to the principle of SMART method of goal setting it is necessary that the goals have: specificity, measurability, achievability, relevance, achievement of the goal should be limited in time, have specific deadlines. To increase the effectiveness of digital marketing strategy, it is necessary to analyze the internal and external environment using the method of SWOT-analysis, the advantage of which is a comprehensive assessment of the company, competitors and the industry as a whole in the face of competition in the international market. The main indicators of evaluation of the effectiveness of digital marketing strategy in the conditions of intensification of competition on the international market are substantiated.
Analysis of Thermo-Elastic Damping of a Ring-Type Resonator
Huinam Rhee,Sergii A. Sarapuloff,J-S Park,Soon Woo Han,Jin Ho Park 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The ring-type resonator can be used for the Coriolis’ Vibratory Gyroscopes (CVG). In order to have a high Q-factor the resonator should be designed to achieve as low damping as possible. Among various damping mechanisms, in this paper, the thermo-elastic phenomenon has been studied, which is related to the damping effect due to the temperature change when the resonator is oscillating. The thermo-elastic damping depends on the geometry of the resonator and on the material properties. This paper especially deals with the dependency of the thermo-elastic damping on the thickness of the ring. It is shown that through the mathematical formulation the worst thickness of the ring resonator can be analytically determined so that the worst design can be effectively avoided in regard to the high-Q factor. The multiphysics finite element analysis was also performed for the thermo-elastic damping and its results were compared to the analytical results.
Skyrmions, Antiskyrmions, Bobbers: New Particles for Information technology
Stefan Blugel,Juba Bouaziz,Sergii Grytsiuk,Jan-Phillip Hanke,Markus Hoffmann,Hongying Jia,Gideon P. Muller,Bernd Zimmermann,Gustav Bihlmayer,Samir Lounis,Nikolai S. Kiselev,Yuriy Mokrousov 한국자기학회 2019 한국자기학회 학술연구발표회 논문개요집 Vol.29 No.2