Scientific Works of Vinnytsia National Technical University https://works.vntu.edu.ua/index.php/works <p>Scientific Works of Vinnytsia National Technical University (ISSN&nbsp;2307-5392) is online quarterly&nbsp;peer-reviewed&nbsp;scientific journal on technical sciences.&nbsp;It is English version of the journal&nbsp;<strong>Praci Vinnytskogo Natsionalnogo Technichnogo Universitetu</strong>&nbsp;(ISSN&nbsp;2307-5376).</p> en-US lezhniuk@praci.vntu.edu.ua (Petro D. Lezhniuk) vnetrebskyy@praci.vntu.edu.ua (Volodymyr Vasyl'ovich Netrebskyy) Wed, 27 Nov 2019 16:19:35 +0200 OJS 3.1.1.0 http://blogs.law.harvard.edu/tech/rss 60 COMPUTER-BASED MODEL FOR STUDYING THE OPERATION OF THE PHOTOVOLTAIC STATION WITH FUZZY REGULATOR OF THE GRID INVERTER https://works.vntu.edu.ua/index.php/works/article/view/547 <p>Computer-based model of 250 kW photovoltaic station, consisting of 88 parallel strings, each of which contains 7 serially connected modules of SunPower SPR-415E-WHT-D type, connected to the local electric grid was developed, applying Matlab programs. Such model enables to carry out the study of the operation of the station with fuzzy regulator of the grid inverter, based on the mathematical model of the electric energy generation process optimization in the grid at photovoltaic station, applying fuzzy sets tool.</p> <p>For the verification of operation adequacy of the photovoltaic station fuzzy regulator the modeling was performed for two cases of electric station operation: with fuzzy regulator and without it. The following condition was met - the loading, climatic conditions and their change was identical for both cases. The greatest impact in the process of electric energy generation by photovoltaic station has the sudden cloud coverage, that leads to the decrease of the amount of solar radiation per unit of the surface area. As a result, electric energy generation drastically drops. That is why, in the process of modeling this parameter played the most important role. Besides the climatic factors, the carrying capacity of the grid has great impact on the process of photovoltaic station generation. Thus, in the process of modeling such modes as electric energy consumers load drop, load increase and simulation of drastically changing climatic factors, for instance, sudden cloud coverage were simulated.</p> <p>Modeling was performed in the time interval from 0 to 0.2 sec. This was sufficient for the assessment of photovoltaic power plant operation in the above- mentioned modes. In the computer model active-inductive loading was used for obtaining the conditions, maximally close to real conditions, in its turn, this enabled to obtain information, regarding the generation of active and reactive power by photovoltaic power plant. For the correct assessment of the grid parameters phase currents and linear voltage of photovoltaic power plant were evaluated.</p> <p>The obtained results prove the efficiency of the fuzzy regulator application, the correctness of the mathematical model and the necessity of taking into consideration the impact of the climatic factors, carrying capacity of the grid on the control of the process of the electric energy transmission by the power plant into the grid.</p> Iryna Bartetska ##submission.copyrightStatement## https://works.vntu.edu.ua/index.php/works/article/view/547 Wed, 27 Nov 2019 00:00:00 +0200 GENERAL MODEL OF THE ELECTRONIC INFORMATION ENVIRONMENT, BASED ON THE MIRRORS CONCEPT https://works.vntu.edu.ua/index.php/works/article/view/549 <p>The paper considers the mirror concept for the construction of the model of the information environment in order to determine the general composition and functional units of the electronic information environment. The results of the recent studies analysis regarding the solution of the problems, dealing with the formation of the sufficiently optimal electronic information environment, adapted to the specific situation, problem and even tastes of the users prove that its target purpose is not always focused on the main tasks of the situational directions of the user’s activity. The needs of the users of electronic information environment are the following information space and its situational operation field must be constructed with the possibility of easy determination of the actions at any moment, assessment of the current state of the system, accessible monitoring of the results. On the base of the theories of the information environment, organization, information systems the definition of the electronic information environment is specified as the set of the hardware and software resources, formed in a single electronic information environment for obtaining the set goals by means of realization of the determined algorithms of the activity processes &nbsp;automation, communication realization, data &nbsp;and knowledge processing with further formation of electronic resources. General model of the electronic information environment is suggested, this model represents &nbsp;the connected set of the models of electronic information space, containing such components (mirrors) as: mirror of the current state of the activity – system of monitoring and control; mirror of the planned (ideal) state of the activity, which is formed as the example of the indices system, description of the technological and control processes, forecast calculations for the innovation projects; decision-making risks, etc; mirrors of variational realizations, depending on the state and possibilities of the external and internal environment. Besides, the strategic mirror of the operation and development indices of the organization and/orthe project shows the correspondence of the current (or forecast indices) to the strategic indices. Functional mirror of the activity processes (including automation processes) – availability of the working field of execution or/and reporting regarding technological and managerial processes. Motivation mirror of the activity processes contains the results of the best projects and the description of the best practices, indices for the comparison etc. The suggested model is also presented mathematically. Testing of the concept and the model is performed on the example of the formation of the electronic information environment of the enterprise and university.</p> Olena Kovalenko ##submission.copyrightStatement## https://works.vntu.edu.ua/index.php/works/article/view/549 Wed, 27 Nov 2019 00:00:00 +0200 GLOBAL BRANDS IN SCIENTIFIC RESEARCH: TRENDS OF THE LAST DECADE https://works.vntu.edu.ua/index.php/works/article/view/550 <p>The dynamics of the research support by the global brands and the dynamics of the global brands usage in the research are analyzed over the last decode. The analysis was carried out according to the scientometic approach with the Scopus base data. The support was assessed by the number of publications in which the global brand is mentioned in the section on the research funding. The usage was assessed by the number publications in which the global brand is mentioned in the presentation part of the article, i. e., in the title, key words or in the abstract. The research was carried out for the global brands from the list of top-100 the most expensive brands according to the data of Interbrand company. Twenty-two brands with the unique names were selected: Google, Microsoft, Coca-Cola, Samsung, Toyota, Facebook, IBM, Cisco, Louis Vuitton, Pepsi, Budweiser, Ebay, Hyundai, Accenture, Volkswagen, Adidas, Morgan Stanley, Huawei, Harley-Davidson, Netflix, Johnnie Walker and Lenovo. The selected brands represent ten sectors of the economy. Greater part of brands&nbsp;– 16 out of 22 belong to the cluster with the equivalent levels of support and usage. The most generous and popular are the brands Google, Microsoft, IBM, Samsung, Volkswagen, Toyota and Facebook. All of them are connected with the information systems and services or with automobile construction. All the brands with high and average levels of support are characterized by the considerable growth of the number of the supported articles over the past two years. Among the analyzed brands the scientists use Google in most cases. During 2017 the number of the articles, where Google is mentioned in the presentation part, exceeded 5500. Facebook, Microsoft and IBM are also among the leaders. All the four brands from the high group as well as Samsung and Netflix from the average group demonstrate stable growth of their usage in the scientific research during the past several years.</p> Olena Shtovba; Serhiy Shtovba ##submission.copyrightStatement## https://works.vntu.edu.ua/index.php/works/article/view/550 Wed, 27 Nov 2019 00:00:00 +0200 IMPACT OF THE SYNTACTIC DEPENDENCIES IN THE SENTENCES ON THE QUALITY OF THE IDENTIFICATION OF THE TOXIC COMMENTS IN THE SOCIAL NETWORKS https://works.vntu.edu.ua/index.php/works/article/view/551 <p>Social networks often become a medium for threats, insults and other components of cyberbullying. A huge number of people are involved in online social networks, therefore, there is a need for automation of the &nbsp;activities to protect users from anti-social behavior. One of the important tasks of such activity is the identification of &nbsp;the toxic comments that contain threats, insults, obscene etc. The bag of words statistics and bag of symbols statistics are typical features for the toxic comments identification. The effect of syntactic dependencies in sentences on the quality of identification of the social network toxic comments is studied in the article. Syntactic dependences are relationships with proper nouns, personal pronouns, possessive pronouns, etc. 20 syntactic features of sentences have been verified in the total. The article shows that 3 additional specific features significantly improve the quality of toxic comments identification. These three features are: the number of dependences with proper nouns in the singular, the number of dependences that contain bad words, and the number of dependences between personal pronouns and bad words. The experiments are based on data from kaggle- competition "Toxic Comment Classification Challenge". The original kaggle-task of categorizing the toxic comments was modified to the classification one with two alternatives: a neutral comment and a toxic comment. For our experiments, the original dataset with 159751 comments was reduced to 106590 comments due to problems with human-free extraction of the syntactic features. The toxic comment rate is 12.8% in the modified dataset. We use mean of the error rates for each types of misclassification as the metric of quality due to unbalanced dataset. A decision tree is used as a classifier. The decision trees were synthesized for two splitting rules: Gini index and entropy criterion.</p> Serhiy Shtovba; Olena Shtovba, Olexandr Yahymovych, Mykola Petrychko ##submission.copyrightStatement## https://works.vntu.edu.ua/index.php/works/article/view/551 Wed, 27 Nov 2019 00:00:00 +0200 IMPROVEMENT OF THE TRANSPORT-TRANSFER HUBS OPERATION DURING MULTIMODAL PASSENGER TRANSPORTATION WITH THE PARTICIPATION OF THE RAILWAYS AND MOTOR TRANSPORT https://works.vntu.edu.ua/index.php/works/article/view/553 <p><em>The article proposes to improve the technology of multimodal railway passenger transportation with the participation of the motor transport by coordinating the schedule of traffic of all types of transport. Harmonization of the schedule is carried out under conditions of transport-transfer hub applying modeling of passenger traffic in the process of interaction of various kinds of transport. This allowed to rationalize the capacity of vehicles, reduce the waiting time for passengers by 30% at the points of transfer, and reduce the requirements for the throughput and processing capacity of the transport-transfer hubs.</em></p> <p><em>It is established that to systematize and optimize the routes of complex passenger traffic it is necessary to establish a systematic collection of information about passenger traffic using modern means of computer equipment, communication and satellite navigation. This will allow the creation of a multimodal technology for the operation of the passenger transportation network in suburban and interurban routes with the participation of railways and motor transport. In its turn, this technology should be based on the ideology of a "single ticket" and a comprehensive liability for compliance with the conditions of passenger transportation.</em></p> <p><em>The calculations made for conditions of the transport and transfer center of the city Dnipro gave an assessment of the economic effect at the level of 3.2 million UAH in a year when the load on transport infrastructure is reduced by 9.2%. This will facilitate the creation of multimodal passenger transport operators and the attractiveness of the transport industry for investors.</em></p> Denys Lomotko; Olexander Filipskyi, Darija Kravchenko ##submission.copyrightStatement## https://works.vntu.edu.ua/index.php/works/article/view/553 Wed, 27 Nov 2019 00:00:00 +0200 BASIC MODERN METHODS OF THE PERINATAL DIAGNOSTICS OF THE HIP JOINT DYSPLASIA: WORLD TRENDS https://works.vntu.edu.ua/index.php/works/article/view/546 <p>The paper describes in details the modern methods of the comprehensive study of the congenital dysplasia of the hip joint in the antenatal and postnatal periods of infant development. Due to the application of modern technologies there appeared the possibility to visualize the initial changes not only in the osseous tissue but also in the soft tissues, which participate in the formation of the hip joint – cartilaginous tissue, muscles, ligaments, tendons, nervous tissue and vascular structures of the joint. Nowadays the state and density of the osseous tissue of the joint can already be determined in the antenatal period of the fetus development. Modern methods of the investigations enable to study in details and visualize tissues, forming the joint, to the finest details. Main task of the preventive diagnostics of the dysplasia is the decrease of the percentage of children, suffering from hip joint dysplasia (HJD), increase of the level of children health safety. Up to the present there existed two traditional methods of HJ study: clinical and roentgenologic. If clinical diagnostics of the hip dislocation is not very clear, then the detection of the subluxation and HJD in the infants of the first months of life causes certain difficulties. Leading role in the diagnostics of the disorders in the development of HJ is devoted to the roentgenologic method of investigation. However, the radiation dose, absorbed during such treatment does not allow to apply this method of study for the infants of less than three months of age. Besides, the nonostereogenic structures – parts of the femoral head, acetabular roof, which, in the infants of the first year life present greater part of these anatomic formations, are not represented in the X-ray image. As a result, it is impossible to detect the disorders of the enchondral formation, sometimes it is a leading manifestation of the hip joint dysplasia. Application of the method of the artificial contrast study of the joint is rather complicated and dangerous for the child. On the base of studying of various methods of HJD diagnostics ,which are scientifically substantiated and widely used in medical practice further development of basically new and improvement of the available diagnostic techniques, aimed at the solution of the problem of the hip joint dysplasia is possible.</p> Yosyp Bilynskiy, Olena Urvan; Artem Guralnik ##submission.copyrightStatement## https://works.vntu.edu.ua/index.php/works/article/view/546 Wed, 27 Nov 2019 00:00:00 +0200