bluuebunny/crossref_metadata_2025 huggingface dataset:
Reconstruction of falsified election results using Shpilkin integral method
Authors: Podlazov Andrey Viktorovich
Published: June 2021

I propose a simple and formal method to reconstruct falsified election results, based on the hypothesis of the mutual independence of the overall turnout and the result of power. This method is a development of the classical method of S.A. Shpilkin, however, it does not require additional assumptions and has no free parameters. In addition, it uniformly reconstructs all key values and uses a simpler and clearer mathematical procedure. Comparison of official and true results of federal elections allows to perform a political science analysis of the development of the institution of electoral frauds in Russia in the 20th century and its impact on the political system.
Forward thinking pedagogical education as a tool for managing the future
Authors: Sirenka Sviatlana Nikolaevna
Published: June 2021

The article examines the problem of advancing education, including pedagogical, from an interdisciplinary perspective. Its relevance during the humanitarian and technological revolution, its essence, goals and objectives are substantiated. The ways of formation of higher education as forward thinking one are proposed. The importance of forward thinking pedagogical education and social demand for the teacher of the future are substantiated. The experience of implementation of forward thinking pedagogical education at the Belarusian State University named after Maxim Tank is presented.
Questions on the feasibility of using virtual reality technologies in the education of schoolchildren and students
Authors: Novikova Galina Viktorovna
Published: June 2021

The article discusses the desirability of massive use of virtual reality technologies in secondary and tertiary education. Due to the policy of digital education, virtual reality technologies are now used not only in the entertainment industry but also in many educational organizations. There are currently no large-scale scientific studies in Russia or abroad on the effectiveness of the use of virtual reality technologies that do not harm users' health. We conducted a study on the impact of the virtual reality film on the psyche and personality of young people, with the participation of more than 60 young people between the ages of 18 and 35. Evidence suggests that the process of immersion in virtual reality has not been the same, depending on the psychophysiological characteristics of young people. 10% of the participants felt uncomfortable watching the film. Overall, one month after viewing, the subjects showed vivid memory traces and a desire to use virtual reality helmets for educational purposes. A number of questions remain to be resolved regarding the organization of studies with schoolchildren: 1) whether such experiments are possible with minors; 2) whether virtual reality helmets can be used on a large scale in educational organizations; 3) with which groups of child health restrictions virtual reality technologies cannot be applied; 4) who and what liability will be incurred in cases of damage to the health of children and adolescents as a result of the use of virtual reality technologies; 5) what are the limits on the age of schoolchildren and the length of time spent in virtual reality.
Art, science, time
Authors: Volnov Ilya Nikolaevich
Published: June 2021

The main forms of time and models of their association are considered. A criterion for the symmetry of the triple balance of time as a degree of harmony in the system is proposed. Examples of degenerate, deformed, and symmetric balances are given. Art is designated as the most important tool for restoring the balance of symmetry in various fields of knowledge.
Численное исследование низкочастотных пульсаций в слое смешения струи натурной аэродинамической трубы и опыт моделирования струйного актуатора для их подавления
Authors: Босняков Сергей Михайлович , Bosnyakov Sergei Mikhailovich , Матяш Иван Сергеевич , Matyash Ivan Sergeevich , Михайлов Сергей Владимирович , Mikhailov Sergei Vladimirovich
Published: June 2021

Дано описание метода высокого разрешения для моделирования крупных вихрей
(LES). Рассмотрена классическая задача турбулентного течения на границе струи
натурной аэродинамической трубы. Дано описание расчетной методологии. Представлены результаты численного моделирования. Обсуждены идея и опыт моделирования струйного актуатора для подавления низкочастотных пульсаций на границе струи.
Analysis of the influence of load inductance on nonlinear distortions of a class D amplifier caused by «dead time»
Authors: Naida S. A. , Onykienko Y. O. , Drozdenko O. I. , Smolenska O. I. , Baran V. S. , Iakunina N. O.
Published: June 2021

Goal. Analysis of the effect of load inductance at the output of the class D amplifier for different values of the duration of «dead time» and assessment of the adequacy of existing mathematical models for calculating the THD at the output of the amplifier depending on the duration of «dead time». Methodology. The study of the effect of «dead time» on the THD was performed using a computer model of the half-bridge converter board EPC9035 from Efficient Power Conversion. This board contains GaN transistors EPC2022 eGaN®, the corresponding control driver and other necessary elements for operation. The use of GaN transistors has made it possible to investigate the operation in a wide range of frequent switching, both to control the motor and to amplify the audio signal. Results. It is established that the value of load inductance affects the level of nonlinear distortions caused by «dead time». At inductance values that provide a constant sign of the output current, a difference arises between the duration of the input and output pulses, which increases the THD. At inductance values, when the choke current changes sign during a pulse, there is no error between the duration of the input and output pulses. Changing the inductance changes the relationship between the error signal and the non-error signal. THD changes accordingly. At high conversion frequencies, the voltage spikes caused by the choke current through the built-in diodes during the dead time are partially compensated by overcharging the output capacitance of the transistors, which also reduces harmonic distortion. Originality. For the first time, the value of the THD at the outlets in the fallowness of the different indices of the inductance of the choke and the theoretical calculation of the value in the results of the computer model was obtained. Practical significance. The dependence of the THD values on the inductance of the choke for converters with a switching frequency range from 1 kHz to 400 kHz, which allows them to be used both to control the motor and to amplify the audio signal.
Validation of optimal electric vehicle charging station allotment on IEEE 15-bus system
Authors: Sengupta D. , Datta A.
Published: June 2021

Introduction. The diminishing conventional energy resources and their adverse environmental impacts compelled the researchers and industries to move towards the nonconventional energy resources. Consequently, a drastic paradigm shift is observed in the power and transportation sectors from the traditional fossil fuel based to the renewable energy-based technologies. Considering the proliferation of electric vehicles, the energy companies have been working continuously to extend electric vehicle charging facilities. Problem. Down the line, the inclusion of electric vehicle charging stations to the electric grid upsurges the complication as charging demands are random in nature all over the grid, and in turn, an unplanned electric vehicle charging station installation may cause for the system profile degradation. Purpose. To mitigate the problem, optimum allocation of the charging stations in existing power distribution system in a strategic manner is a matter of pronounced importance in maintaining the system stability and power quality. In this paper, optimum allocation of electric vehicle charging stations in IEEE 15-bus system is studied in order to minimize the highest over and under voltage deviations. Methodology. Primarily, voltage stability analysis is carried out for identification of the suitable system nodes for the integration. Voltage sensitivity indices of all the system nodes are calculated by introducing an incremental change in reactive power injection and noting down the corresponding change in node voltage for all nodes. Henceforth, dynamic load-flow analysis is performed using a fast and efficient power flow analysis technique while using particle swarm optimization method in finding the optimal locations. Results. The results obtained by the application of the mentioned techniques on IEEE 15-bus system not only give the optimum feasible locations of the electric vehicle charging stations, but also provide the maximum number of such charging stations of stipulated sizes which can be incorporated while maintaining the voltage profile. Originality. The originality of the proposed work is the development of the objective function; voltage stability analysis; power flow analysis and optimization algorithms. Practical value. The proposed work demonstrates the detailed procedure of optimum electric vehicle charging station allotment. The experimental results can be used for the subsequent execution in real field.
THE IMPORTANTS OF CLUSTERING IN LOGISTIC SYSTEMS
Authors: Veres Peter
Published: June 2021

Nowadays, the development of higher efficient processes and procedures is the key for success in industrial environment. The companies have machines, production lines, software and hardware tools with high level principles of efficient working. Example: the Industry 4.0 concept use the machines and methods of the near past, upgrade them, and gave them new purpose, as a more efficient tool. Some of the bases of those tools are not as efficient as which many would think, like in group generating or in other word clustering. Clustering is a very hard process, and it is in almost every decision making in every company’s lives. It is important to sometimes examine its significance and flaws. This paper presents the clustering briefly and shows its errors through an example.
INTERACTION OF THE ABRASIVE MEDIUM WITH THE TREATED SURFACE AND THE PROCESS OF METAL REMOVAL DURING VIBRATION TREATMENT IN THE PRESENCE OF A CHEMICALLY ACTIVE SOLUTION
Authors: Mitsyk Andrii , Fedorovich Vladimir , Grabchenko Anatoliy
Published: June 2021

Interaction of working medium granules with the processed surface of the part is considered. It is noted that the processing methods are characterized by the dynamic interaction of the abrasive medium with the processed surface. It is indicated that during vibration treatment there is an impact contact of the abrasive granule with the surface of the part, which leads to the formation of characteristic traces during the formation of the surface relief. The types of impact of abrasive grains of working medium granules on the surface of the processed part are identified. It is indicated that the effect of abrasive grains depends on the geometric parameters of the tops of the grains and the working contour of the granule as a whole. The alternation of the operation of abrasive grains in the connection with the nature of the motion of the granule over the surface of the part is shown. The interaction of surfaces of bodies during vibration treatment is considered. The distinctive features of the vibration treatment method from other analogs are indicated. The conditions for the formation of the surface layer of the part during vibration processing are given. The analysis of the mechanical-physicochemical model of the micro-cutting process in the presence of a chemically active solution is carried out and a comparison of the intensity of technologies for vibration treatment of steel parts is given.
INVESTIGATION OF THE EFFECT OF AREAL ROUGHNESS MEASUREMENT LENGTH ON FACE MILLED SURFACE TOPOGRAPHIES
Authors: Nagy Antal
Published: June 2021

Surface roughness is of great importance in the manufacturing industry, as it affects surfaces’ tribological properties (wear, friction, lubrication, etc.), corrosion resistance, fatigue strength and appearance. Areal roughness measurement, which provides a more comprehensive characterization of surfaces, is becoming increasingly popular, but systematic studies are still lacking, so measurements are often analyzed differently. In this paper, the effect of the measurement length is analyzed in the main measurement direction on areal roughness of face milled surface topographies, which were measured with a confocal chromatic sensor.
THE EFFECT OF THE CIRCULAR FEED ON THE SURFACE ROUGHNESS AND THE MACHINING TIME
Authors: Sztankovics István
Published: June 2021

The surface roughness is analysed in different feeds and turning procedures (rotational and conventional) in this paper. Cutting experiments were made on different cutting speeds and feed rates with 2 cutting tool with helical edge geometry and 1 traditional turning tool. The measured 2D surface roughness values were compared between the different cutting tools. The benefit of the circular feed application is showed by the decrease of roughness parameters and machining time.
SURFACE ROUGHNESS MODELING DURING ELECTRIC DISCHARGE GRINDING WITH VARIABLE POLARITY OF ELECTRODES
Authors: Strelchuk Roman
Published: June 2021

The article presents the probabilistic-statistical modeling of surface roughness in the process of electric discharge grinding with the variable polarity of electrodes. The correlation between electric modes of machining and indicators of the quality of the machined surface was established. A probabilistic-statistical model of part surface roughness formed during grinding is obtained, which establishes the correlation between high-altitude surface parameters and electrical machining modes. The developed model makes it possible to calculate the height parameters of the part roughness depending on the electrical modes of grinding. The height of microroughness is determined by the same machining conditions as the depth of erosion pits. It is possible to obtain low roughness if electrical machining modes are reduced.
TECHNOLOGICAL PROVISION OF THE ACCURACY FOR THE THREAD FORM OF ROD PUMPS
Authors: Yakovenko Ihor , Vasilevskyi Yurii , Basova Yevheniia , Edl Milan
Published: June 2021

Aspects of thread manufacturing used in downhole rod pumps are considered. Technological defects of distortion of lateral surfaces of a thread profile arising in the course of processing on CNC machines are described, and the factors which most influence formation of these defects are established. The influence of profile defects on the reliability of the threaded connection during the operation of rod pumps is analyzed, as well as the research on the dynamics and oscillations of machine systems is analyzed. With the performed analysis the mathematical model of real technological system in the course of machining process is created and investigated. The main technological factors that have the greatest influence on the occurrence of error in the shape of the thread surface are identified. With the help of software for analysis of dynamic systems, the necessarily calculations were performed and the behavior of the dynamic system in the process of forming the thread profile was considered. Based on the analysis of the obtained results, a system for managing the parameters of the technological process of threading and technological solutions formulated. The introduction of which had a positive impact on the stability of the machining process and reduce the frequency of the above defect.
EVALUATION OF THE FORECASTED EFFICIENCY OF PERFORMANCE OF RATIONAL ORIENTATION OF THE PRODUCT IN THE WORKSPACE OF ADDITIVE INSTALLATIONS
Authors: Garashchenko Yaroslav , Zubkova Nina
Published: June 2021

Preliminary evaluation of the predicted efficiency of the optimization problem of the rational orientation of the product in the working space of layered construction of additive units is proposed to perform based on the analysis of the original triangulation 3D-model of a complex product by its spherical mapping. The condition of reflection on the sphere is that the values of angles in the spherical coordinate system for the faces normal of the triangulated model of product fall into the range of values of a certain triangular face of the sphere model. Examples of evaluation based on the analysis of spherical mapping of the original 3D model of products are considered. Industrial products with different surface complexity were selected as test 3D models. This approach allowed to perform a comparative analysis of the results depending on the design features of the products. The practical implementation was performed in the subsystem of visual assessment of geometric characteristics of triangulated 3D-models, which is part of the technological preparation system for the complex product manufacture by additive methods. This system was developed in NTU "KhPI" Department of Integrated Technologies of Mechanical Engineering named after M.F. Semko.
NEW MATERIALS FOR THE PRODUCTION OF REPLACEABLE PARTS OF TILLAGE AGRICULTURAL MACHINERY
Authors: Askerov Mukafat Geibat ogly
Published: June 2021

The analysis of results of practical application of cast replaceable details of hinged tillage agricultural machinery at operation in a number of the agricultural enterprises of the Poltava region at processing of more than 60 thousand hectares within several years is presented. Comparative data of the resource of parts made of high-strength bainitic cast iron and steel serial analogues of domestic and foreign production are given. The advantages of the method of manufacturing by casting methods in comparison with the traditional method of manufacturing by stamping. This technology allows you to easily make adjustments to the design of the cultivator legs, thus providing a new quality of tillage and pruning of the root system of weeds, which eliminates the need for herbicides. The basis of this technology is the use of composite complex modifiers made by rolling powder mixtures of plastic and brittle components with the necessary observance of the proportions of their ratio. The use of powder rolled modifiers provides the necessary properties and structure of the cast metal required for further heat treatment. It is substantiated to obtain high wear resistance of cast products due to the appearance of TRIP-effect and constant updating of wear-resistant surface layer during operation.
QUASIOPTICAL SOLID-STATE GENERATOR WITH OPEN QUASI-FREQUENCY SPHEREOSELETAL OSCILLATING SYSTEM
Authors: Olkhovskiy Ivan , Fursov Anatoliy
Published: June 2021

The results of research related to the development of an effective high-Q open oscillatory system of quasi-optical solid-state generators of millimeter and submillimeter wavelength ranges are presented. It is shown that for the stable operation of solid-state generators based on Gunn diodes and avalanche-transit diodes (ATDs) located inside an open resonator (OR), a significant rarefaction of the resonance frequency spectrum is required, which excludes jumps of the generation frequency. Taking this requirement into account, a spheroechelett  open resonator (SE OR) is proposed as an open oscillatory system of solid-state generators, one of the mirrors of which is a reflective lattice of the “echelette” type. The paper presents the results of “cold” measurements of the spectrum of resonance frequencies of the SE OP, which indicate that the SE OP indeed has a significantly rarefied spectrum both in transverse and, which is very important, in longitudinal modes of oscillations. The conditions necessary for the excitation of high-quality stable oscillations with high energy efficiency in a solid-state generator based on an SE OR are discussed and implemented. The results of an experimental study of a quasi-optical generator based on an 8-mm ATD wavelength range are presented. The analysis of the obtained characteristics and their qualitative explanation on the basis of the proposed model of the processes occurring in the investigated generator are presented. It is shown that the SE OR can be used as a resonant system in the entire EHF range of not only solid-state, but also electronic-vacuum devices. Finally, a way is outlined in the direction of further rarefaction of the spectrum of the SE OR in order to create a really single-frequency open oscillatory system.
ANALYSIS OF BATTERIES ACTIVE BALANCE SCHEMES EFFICIENCY
Authors: Styslo Bohdan , Zaitsev Roman , Minakova Kseniia , Kirichenko Mykhailo , Eresko Oleksandr
Published: June 2021

The paper reviews the existing circuit solutions of devices for balancing electric batteries. The balancing principle on the basis of capacitive and inductive buffer elements has been described. It was shown the features of their work and the basic calculations for each device type. For circuits with transformer topology, the calculated values for determining the balancing current are indicated. Based on the circuit solutions analysis, the efficiency of using solutions based on inductive buffer elements is numerically determined and proved. Powerful batteries for power supply systems are used in the form of stacks, consisting of a series-parallel connection of single cells. During their operation, there is a problem of uneven discharge or charge, to compensate which it is necessary to make voltage levels balancing in the stack batteries. For safely using electrochemical batteries the using of specialized balancing devices is required. The most efficient, from an energy point of view, are active balancing systems. The analysis of the mathematical model of two types (capacitive and inductive) buffer elements operation allowed to give a qualitative assessment of their efficiency. The first, in comparison with inductive - not only have worse energy characteristics, but also do not allow to perform "scaling" of the device without significant complication of the control system. The current amplitude value in circuits with a capacitive buffer element is limited only by the internal parasitic resistances of the circuit elements, therefore, with a relatively large value of imbalance, in circuit elements (including batteries) takes place a significant energy loss in the form of heat which negatively effects on rechargeable battery parameters. The current amplitude value in the circuit based on inductive buffer elements is limited by the inductance value. It can be calculated at the device design stage. In addition, providing the control system with intermittent converter operation allows to reduce switching losses in the circuit power switches and increases the overall operation efficiency. With a large number of batteries (more than three) should be preferred transformer balancing systems, as a special case of inductive topology.
Study of the effectiveness of image classifiers by statistical distributions for components of structural description
Authors: Gorokhovatsky Volodymyr , Gadetska Svitlana , Zhadan Oleksii , Khvostenko Oleksandr
Published: June 2021

The subject of research is models for constructing image classifiers in the description space as a set of descriptors of key points in the recognition of visual objects in computer vision systems. The goal is to create and study the properties of the image classifier based on the construction of an ensemble of distributions for the components of the structural description using various models of classification decisions, which provides effective classification. Tasks: construction of classification models in the synthesized space of images of probability distributions, analysis of parameters influencing their efficiency, experimental evaluation of the effectiveness of classifiers by means of software modeling based on the results of processing the experimental image base. The applied methods are: ORB detector for formation of keypoint descriptors, data mining, mathematical statistics, means of determining relevance for sets of data vectors, software modeling. The obtained results: The developed method of classification confirms its efficiency and effectiveness for image classification. The effectiveness of the method can be enhanced by the introduction of a variety of types of metrics and measures of similarity between centers and descriptors, by the choice of method of forming centers for reference etalon descriptions, by the introduction of logical processing and compression of the structural description. The best results of the classification were shown by the model using the most important class by the distribution vector for each descriptor corresponding to the mode parameter. The use of a concentrated part of the description data makes it possible to improve its distinction from other descriptions. The use of the median as the center of description has an advantage over the mean. Conclusions. Scientific novelty is the development of an effective method of image classification based on the introduction of a system of probability distributions for data components, which contributes to in-depth analysis in the data space and increases in classification effectiveness. The classifier is implemented in the variants of comparing the integrated representation of distributions by classes and on the basis of mode analysis for the distributions of individual components. The practical importance of the work is the construction of classification models in the modified data space, confirmation of the efficiency of the proposed modifications of data analysis on examples of images, development of software models for implementation of the proposed classification methods in computer vision systems.
METHOD OF MODELING OF A SOCIAL PROFILE USING BIG DATA STRUCTURE TRANSFORMATION OPTIMIZATION
Authors: Mozhaiev Mykhailo , Buslov Pavlo
Published: June 2021

The object of the research are methods and algorithms of optimizing of the Big Data transformation to build a social profile model, the subject of the research are methods of constructing of a social profile. For decision-making person, the problem of scientific methodological and instrumental re-equipment is relevant for the effective fulfillment of a set of managerial tasks and confronting of fundamentally new challenges and threats in society. This task is directly related to the problem of building of a model of the social profile of both the individual and the social group as a whole. Therefore, the problem of optimizing of methods of constructing of a mathematical model of a social profile is certainly relevant. During the research, methods of the mathematical apparatus of graph theory, database theory and the concept of non-relational data stores, Big Data technology, text analytics technologies, parallel data processing methods, methods of neural networks' using, methods of multimedia data analyzing were used. These methods were integrated into the general method, called the method of increasing of the efficiency of constructing of a mathematical model of a social profile. The proposed method improves the adequacy of the social profile model, which will significantly improve and simplify the functioning of information systems for decision-making based on knowledge of the social advantages of certain social groups, which will allow dynamic correction of their behavior. The obtained results of testing the method make it possible to consider it as an effective tool for obtaining of an objective information model of a social portrait of a social group. This is because the correctness of setting and solving of the problem ensured that adequate results were obtained. Unlike the existing ones, the proposed modeling method, which uses an oriented graph, allows to improve significantly the quality and adequacy of this process. Further research should be directed towards the implementation of proposed theoretical developments in real decision-making systems. This will increase the weight of automated decision-making systems for social climate analysis.
Calculation apparatus for modeling the distribution of electromagnetic fields of different sources
Authors: Khodakovskyi Oleksii , Levchenko Larysa , Kolumbet Vadym , Kozachuk Anna , Kuzhavskyi Dmytro
Published: June 2021

The calculation apparatus acceptable for assumptions and simplifications and sufficient for errors of final results for modeling the propagation of electric, magnetic and electromagnetic fields spread over a certain area was proposed. It is shown that to model the propagation of ultra-low frequency electric and magnetic fields (monitors, uninterruptible power supplies, transformers, electric motors and generators) it is possible to consider these sources as dipole and dipole-quadrupole type sources. That is, the field of the local source can be considered as a combination of electric and magnetic dipoles. This makes it possible to delineate with sufficient accuracy the zones of exceeding the maximum allowable field strengths. The calculation apparatus used to determine the radiation intensities of civil aviation radar equipment was adapted to model the propagation of electromagnetic fields of very high and ultra-high frequencies. The calculations of coefficients that take into account the parameters of radiation patterns in the horizontal and vertical planes for the most common radiation sources are given. These ratios and corresponding coefficients can be used to determine the electromagnetic environment in the presence of many high-frequency sources (mobile communication base stations, navigation equipment, radio relay stations, etc.). The proposed approach allows to automate processes of designing the placement of electromagnetic, electronic and radio equipment in production areas and territories, as well as to assess the environmental impact at the stages of design work. This will make it possible to delineate the isolines of the limits of exceeding the maximum permissible levels of electric magnetic and electromagnetic fields for different frequency ranges and categories of equipment and to automatically determine the electromagnetic load at each point of the controlled space.
MUTATION TESTING OF ACCESS CONTROL POLICIES
Authors: Cherneva Galina , Khalimov Pavlо
Published: June 2021

One of the most important and integral components of modern computer security are access control systems. The objective of an access control system (ACS) is often described in terms of protecting system resources against inappropriate or unwanted user access. However, a large degree of sharing can interfere with the protection of resources, so a sufficiently detailed AC policy should allow selective exchange of information when, in its absence, sharing can be considered too risky in general. Erroneous configurations, faulty policies, as well as flaws in the implementation of software can lead to global insecurity. Identifying the differences between policy specifications and their intended functions is crucial because the correct implementation and enforcement of the policies of a particular application is based on the premise that the specifications of this policy are correct. As a result of the policy, the specifications presented by the models must undergo rigorous validation and legalization through systematic checks and tests to ensure that the specifications of the policies really correspond to the wishes of the creators. Verifying that access control policies and models are consistent is not a trivial and critical task. And one of the important aspects of such a check is a formal check for inconsistency and incompleteness of the model, and the security requirements of the policy, because the access control model and its implementation do not necessarily express policies that can also be hidden, embedded by mixing with direct access restrictions or another access control model.
Application of data hashing tools to accelerate classification decisions in structural image recognition methods
Authors: Gorokhovatsky Volodymyr , Vlasenko Nataliia , Rybalka Mykhailo
Published: June 2021

The subject of this research is the image classification methods based on a set of key points descriptors. The goal is to increase the performance of classification methods, in particular, to improve the time characteristics of classification by introducing hashing tools for reference data representation. Methods used: ORB detector and descriptors, data hashing tools, search methods in data arrays, metrics-based apparatus for determining the relevance of vectors, software modeling. The obtained results: developed an effective method of image classification based on the introduction of high-speed search using hash structures, which speeds up the calculation dozens of times; the classification time for the considered experimental descriptions increases linearly with decreasing number of hashes; the minimum metric value limit choice on setting the class for object descriptors significantly affects the accuracy of classification; the choice of such limit can be optimized for fixed samples databases; the experimentally achieved accuracy of classification indicates the efficiency of the proposed method based on data hashing. The practical significance of the work is - the classification model’s synthesis in the hash data representations space, efficiency proof of the proposed classifiers modifications on image examples, development of applied software models implementing the proposed classification methods in computer vision systems.
Development of a generalized mathematical model of static error electromechanical measuring equipment
Authors: Mosharenkov Viktor , Voitenko Serhii
Published: June 2021

To keep military equipment fit for use, carry out maintenance activities, an important and integral part of which is metrological service. The effectiveness of metrological services depends on the completeness of the coverage of the monitored parameters, frequency and reliability of their measuring control. The most common, at present, when controlling the parameters of military equipment are electromechanical measuring equipment. The main metrological characteristic of electromechanical measuring instruments in a static measurement mode is the nominal calibration characteristic. During operation, the calibration characteristic of electromechanical measuring instruments, under the influence of various factors, has deviations from the nominal, which leads to an instrumental static error. The article deals with the applied aspects of assessing the static error of electromechanical measuring equipment, which is expressed through the sensitivity or static transmission coefficients of measuring transducers. Based on the results of the analysis, a generalized mathematical model of the relative static error of electromechanical measuring equipment for various structural schemes of connecting measuring transducers was obtained. It is proposed to apply a generalized mathematical model to assess the relative static error of electromechanical measuring instruments (with various structural schemes) during their operation. The use of an updated static error will allow to refine the calibration characteristics of electromechanical measuring instruments, which in turn will lead to obtaining reliable information about the state of military equipment during metrological maintenance and immediately before use.
METHOD FOR DETERMINING THE SEMANTIC SIMILARITY OF ARBITRARY LENGTH TEXTS USING THE TRANSFORMERS MODELS
Authors: Олізаренко Сергій , Радченко В’ячеслав
Published: June 2021

The paper considers the results of a method development for determining the semantic similarity of arbitrary length texts based on their vector representations. These vector representations are obtained via multilingual Transformers model usage, and direct problem of determining semantic similarity of arbitrary length texts is considered as the text sequence pairs classification problem using Transformers model. Comparative analysis of the most optimal Transformers model for solving such class of problems was performed. Considered in this case main stages of the method are: Transformers model fine-tuning stage in the framework of pretrained model second problem (sentence prediction), also selection and implementation stage of the summarizing method for text sequence more than 512 (1024) tokens long to solve the problem of determining the semantic similarity for arbitrary length texts.
A METHOD FOR ASSESSING THE MILITARY-ECONOMIC INDICATORS WITH THE PURPOSE OF LOCATING A LOGISTICS CENTER FOR REDEPLOYING TROOPS
Authors: Талібов Азіз Машалла , Гулієв Бахтіяр Вагиф
Published: June 2021

The article proposes a methodology for assessing the economic efficiency of a logistics center that provides technical support to redeploying troops. It is noted that the development of this method is based on the assessment of the efficiency of the logistics center, taking into account its economically efficient functionality, without regard to the use of classical profitability. The author analyzes the structure of capital expenditure and operating expenses allocated for the establishment of a logistics center, proposing the maintenance and repair expenses for each unit of equipment as the main criterion, proposing their calculation in the general case, and substantiating the military-economic indicators of the center. An analysis of the structure of capital expenditure and operating expenses aimed at organizing a logistics center, as well as the military-economic indicators of this center, gives grounds to note the following results: the structure of capital expenditure and operating expenses associated with designing a logistics center for the troops has been elaborated; the calculation method has been developed, taking into account the available resources, communications and infrastructure, information reflected in the annual plans for the operation and maintenance of automotive and armored vehicles of military units; the calculation methodology developed on the basis of the structure of capital expenditure and operating expenses on the organization of a logistics center also reflects the infrastructure indicators related to the geographic location of the center (the distance of the logistics center from the transport hub and the military units it services); the proposed method can be used to choose a geographic location that is favorable from the point of view of economic profitability for organizing a logistics center for the troops; using this method, it is possible to compare the economic aspects of various options of organizing military logistics.
Similarity in Sequential Bilateral Transient Osteoporosis of the Hip
Authors: Kuroda Yutaka , Koumoto Satoru , Okuzu Yaichiro , Kawai Toshiyuki , Goto Koji , Matsuda Shuichi
Published: June 2021

Case:

Three middle-aged men with habitual drinking developed unilateral hip pain and were referred for osteonecrosis of the femoral head (ONFH). Radiographs showed osteopenia, and magnetic resonance imaging (MRI) showed diffuse bone marrow edema (BME). After several months, the patients' symptoms resolved and radiographic images normalized. More than 6 months later, the contralateral side showed the same clinical course.

Conclusion:

Transient osteoporosis of the hip (TOH) resembles ONFH but heals spontaneously. We report 3 rare cases of sequential TOH, similar in that they occurred in middle-aged male habitual drinkers at risk for ONFH, characterized by diffuse BME on MRI and radiographic resolution.
New insights into the depositional environment and stratigraphic position of the Gugu Breccia (Pădurea Craiului Mountains, Romania)
Authors: Suciu Traian , Pleş George , Tămaş Tudor , Bucur Ioan I. , Săsăran Emanoil , Cociuba Ioan
Published: June 2021

The study of the carbonate clasts and matrix of a problematic sedimentary formation (the Gugu Breccia) from the Pădurea Craiului Mountains reveals new information concerning its depositional environment and stratigraphic position. The identified microfacies and micropaleontological assemblages demonstrate that all the sampled limestone clasts from the Gugu Breccia represent remnants of a fragmented Urgonian-type carbonate platform. The Barremian age of the clasts suggests that the stratigraphic position of the Gugu Breccia at its type locality could be uppermost Barremian-lowermost Aptian, a fact demonstrated also by the absence of elements from Lower Cretaceous carbonate platforms higher in the stratigraphic column (e.g., Aptian or Albian) of the Bihor Unit. The sedimentological observations together with the matrix mineralogy bring new arguments for the recognition of terrigenous input during the formation of the Gugu Breccia.
Relato de planejamento e intervenção pedagógica no componente curricular de Agricultura III do IFC – Campus Santa Rosa do Sul, com o tema “o ensino da bananicultura no Extremo Sul Catarinense”
Authors: Panzenhagen Nestor Valtir , Zotti Solange Aparecida , Weiduschat Íris
Published: June 2021

Este trabalho relata ações de planejamento e intervenção pedagógica no componente curricular de Agricultura III, ministrado no terceiro ano letivo do Curso Técnico em Agropecuária do IFC – Campus Santa Rosa do Sul, relacionado ao ensino da bananicultura no Extremo Sul Catarinense. Esta atividade foi desenvolvida como requisito à conclusão do Curso de Especialização em Educação Profissional e Tecnológica, promovido pelo IFC, em 2020. As aulas remotas ocorreram nos dias 07, 14 e 21 de outubro de 2020 e todos os estudantes foram previamente comunicados das mesmas. Cada encontro constou de 90 minutos de aulas interativas, em que os estudantes puderam intervir para sanar dúvidas e colaborar com o processo de ensino-aprendizagem. Também foram aplicados dois questionários junto aos estudantes visando identificar a percepção dos mesmos quanto às aulas planejadas e executadas. De forma genérica, as percepções dos estudantes foram bastante positivas. Por outro lado, estas percepções também criaram novos elementos, que contribuíram para subsidiar a necessária autocrítica docente visando melhorar e qualificar as atividades letivas cotidianas. Os resultados também mostraram que o índice de acertos de questões técnicas foi superior para aqueles estudantes que assistiram às aulas online, em relação aos que apenas consultaram o arquivo técnico disponibilizado. Estas atividades proporcionaram experiências gratificantes e que muito contribuíram para o enriquecimento do aprendizado pessoal e profissional.
Effect of Different Feeding Methods on Gastrointestinal Function in Critical Patients (DFM-GFC): Study Protocol For a Randomized Controlled Trial
Authors: Zheng Bojun , Li Jian , Yu Yi , Deng Aijing , Ouyang Honglian , Xin Huang , Chen Hong , Yang Guang
Published: June 2021

Background: Enteral nutrition is a major pathway of nutrition for patients requiring critical care. However, whether intermittent or continuous feeding is better is not yet known clearly, especially after nasogastric enteral nutrition via gastric tube. Therefore, this randomized controlled clinical study was designed to observe the effects of different methods on critically ill patients.Methods: The different feeding method on gastrointestinal function of critical patients (DFM-GFC) was a randomized, single-blind, clinical study assessing the effects of three feeding methods on critically ill patients. A total of 90 critical patients were equally randomized to three groups: continuous feeding, cycling feeding, and intermittent feeding. The patients were pumped with gastrointestinal nutrition preparation via gastric tube in 24 h or in 16 h via intermittent pump. The primary outcome is the mean duration that reached to the caloric goal in every group. The secondary outcome included the rate of onset of gastric residua, abdominal pressure, the rate of onset pneumonia, and the proportion of individuals achieving the caloric goal. Also, the length of intensive care unit (ICU) stay and mortality rate at 28 days post-enrollment was evaluated.Discussion: This study observes the effects of different feeding methods on parameters, such as energy target and gastrointestinal motility in critically ill patients, in order to improve the prognosis of, quality of life and reduce the case fatality rate.Trial registration: ClinicalTrials.gov ID: NCT04224883. Registered on January 9, 2020.
Software Module Clustering Using Grid-Based Many-Objective Particle Swarm Optimization
Authors: Prajapati Amarjeet
Published: June 2021

The poor performance of traditional multi-objective optimization algorithms over the many-objective optimization problems has led to the development of a variety of many-objective optimization algorithms. Recently, several many-objective optimization algorithms have been proposed to address the different class of many-objective optimization problems. Most of the existing many-objective optimization algorithms were designed from the perspective of synthetic many-objective optimization problems. Despite the tremendous work made in the development of the many-objective optimization algorithms for solving the synthetic many-objective optimization problems, still real-world many-objective optimization problems gained little attention. In this work, we propose a grid-based many-objective particle swarm optimization (GrMaPSO) for the many-objective software optimization problem. In this contribution, the grid-based selection strategies along with other supportive strategies such as two-archive storing and crowding distance have been exploited in the framework of particle swarm optimization. The performance of the proposed approach is evaluated and compared to three existing approaches over five problem instances. The results demonstrate that the proposed approach is more effective and has significant advantages over existing many-objective approaches designed for the software module clustering problems.
Echinicola Salinicaeni sp. nov., A Novel Bacterium Isolated from Saltern
Authors: Zhao Han , Song Chun-Yi , Yin Rui , Yi Yan-Jun , Yun Shuai-Ting , Li Ying-Xiu , Zhou Yanxia
Published: June 2021

A Gram-stain-negative, aerobiotic, pink, motile, rod-shaped bacterium, designated P51 T was isolated from saline silt samples in Yantai, China. The novel isolate was able to grow at 4–42 °C (optimum 33 °C), pH 4.0–9.0 (optimum 7.0) and with 0–11.0% NaCl (optimum 4.0%, w/v). It could grow at 4 °C, which was different from the neighbour strains. The draft genome consisted of 4111 genes with a total length of 5139782 bp and 39.9% G + C content. The 16S rRNA gene sequence analysis indicated that strain P51 T was a member of the genus Echinicola and most closely related to ‘ Echinicola shivajiensis ’ with pair-wise sequence similarity of 97.7%. Genome analysis identified genes encoding proteins relating to carbon source utilization such as glycoside hydrolases and glycosyl transferases; carotenoid biosynthesis pathway and β -lactam resistance pathway were observed. Strain P51 T shared average nucleotide identity value below 84.7%, average amino acid identity value between of 70.8 – 89.3%, digital DNA-DNA hybridization identity of between 17.9–28.2% with the closely related type strains within the genus Echinicola . The sole menaquinone was MK-7; the major fatty acids were iso-C 15:0 , summed feature 3(C 16:1 ω 7 c and/or C 16:1 ω 6 c ), summed feature 4 (anteiso-C 17:1 B and/or iso-C 17:1 I) and summed feature 9 (iso-C 17:1 ω 9 c and/or 10-methyl C 16:0 ); the polar lipids included one phosphatidylethanolamine, one unidentified aminophospholipid, one unidentified phospholipid, three unidentified aminolipids and one unknown lipid. Based on phenotypic, chemotaxonomic, and phylogenetic analyses, strain P51 T represents a novel species of the genus Echinicola , for which the name Echinicola salinicaeni sp. nov. is proposed. The type strain is P51 T (KCTC 82513 T = MCCC 1K04413 T ).