2024
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Документ An adaptive method for building a multivariate regression(Національний технічний університет "Харківський політехнічний інститут", 2024) Pavlov, Alexander; Holovchenko, Maxim; Drozd, ValeriiaWe propose an adaptive method for building a multivariate regression given by a weighted linear convolution of known scalar functions of deterministic input variables with unknown coefficients. As, for example, when multivariate regression is given by a multivariate polynomial. In contrast to the general procedure of the least squares method that minimizes only a single scalar quantitative measure, the adaptive method uses six different quantitative measures and represents a systemically connected set of different algorithms which allow each applied problem to be solved on their basis by an individual adaptive algorithm that, in the case of an active experiment, even for a relatively small volume of experimental data, implements a strategy of a statistically justified solving. The small amount of data of the active experiment we use in the sense that, for such an amount, the variances of estimates of unknown coefficients obtained by the general procedure of the least squares method do not allow to guarantee the accuracy acceptable for practice. We also proposed to significantly increase the efficiency of the proposed by O. A. Pavlov. and M. M. Holovchenko modified group method of data handling for building a multivariate regression which is linear with respect to unknown coefficients and given by a redundant representation. We improve it by including some criteria and algorithms of the adaptive method for building a multivariate regression. For the multivariate polynomial regression problem, the inclusion of a partial case of the new version of the modified group method of data handling in the synthetic method proposed by O. A. Pavlov, M. M. Golovchenko, and V. V. Drozd, for building a multivariate polynomial regression given by a redundant representation, also significantly increases its efficiency.Документ Analysis of finite-difference approximation of code "FLOW" in performing design calculations of parameters in the primary and secondary circuits of VVER reactor plant(Національний технічний університет "Харківський політехнічний інститут", 2024) Lys, Stepan; Yurasova, Oksana; Galyanchuk, IgorIn code package “FLOW” energy and coolant hydrodynamics equations, neutron kinetics equations and equations of heat conduction in metalwork and fuel rods are solved together. Processes described by these equations are characterized by different time constants and during calculation different degree of time and space discretization is required. The objective of the work was demonstration of stability of numerical schemes used in “FLOW" program and its modules, assessment of error of numerical solution for nodalization. Initial differential equations in partial derivative of the law of conservation of mass, energy and momentum are reduced to the system of usual differential equations on the basis of spatial approximation with the use of integro-interpolation method. Approximation was performed by integrating the initial differential equations in partial derivatives within the limits of each elemental volume of division by spatial coordinate. The usage of integro-interpolation method provides fulfilment of laws of conservation on computational mesh as a whole and the second order of approximation by spatial coordinate. The usage of integro-interpolation method provides fulfilment of laws of conservation on computational mesh as a whole (conservatism of approximation method) and the second order of approximation by spatial coordinate. Effect of limiting error of integration in “FLOW” code on pressure values at the core outlet and mass discharge from the leak is not practically distinguished. Effect of these errors on the values of coolant flow rates at the core inlet and outlet becomes more noticeable. Still, maximum value of these differences doesn’t exceed 7 % for flow rate at the core inlet. More substantial differences (of the order of 10–15 %) are observed in the course of calculated temperature of fuel rod cladding.Документ Consumer behavior in relation to social enterprises and organizations implementing social innovation(Національний технічний університет "Харківський політехнічний інститут", 2024) Szabolcs, NagyThis paper examines the growing role of social enterprises, which prioritize both social and environmental goals alongside profit. Despite the increasing prominence of social enterprises, the factors influencing consumer behavior towards them are under-researched. This paper seeks to fill that gap by reviewing the literature on consumer behavior and social enterprises, focusing on the role of social innovation. Through a systematic literature review, it identifies key factors influencing consumer engagement, including ethical concerns, perceived social impact, trust, and transparency. This study contributes to the growing body of literature on social innovation and consumer behavior, offering insights for both academics and practitioners seeking to enhance the relationship between consumers and socially innovative organizations.Публікація CSR in the construction industry: a critical review of conceptual and methodological frameworks(Національний технічний університет "Харківський політехнічний інститут", 2024-02-14) Nashchekina, O. M.; Tymoshenkov, Ihor Vladyslavovych; Ovsepіan, RuzanaThe construction industry plays a vital role in the socio-economic development of any society. At the same time, the industry produces adverse social and environmental effects, which makes the adoption ofcorporate social responsibility (CSR) by construction companies especially relevant. For CSR management and research purposes, the abstract concept of CSR should be described in a structured and specific way, using certain conceptual and methodological frameworks. The goal of this article is to provide a critical review of the CSR frameworks used in academic literature on CSR in the construction industry and in CSR-related standards. We discuss CSR in terms of the industry-specific material topics proposedin the SASB standards. In particular, we show the importance of life cycle analysis for the construction industry,taking into account the nature of its products. We also show that the CSR of construction companies extends to the environmental impact not only of their own production activities but also of their construction products(buildings, infrastructure objects). We demonstrate that the LEED rating and certification system provides a comprehensive framework for such an important aspect of CSR as green building. In the academic and business literature, broad dimensions of CSR are often defined using the corporate sustainability and ESG concepts, and then narrower, specific topics are identified within each for those dimensions. We summarize such specific topics along economic, social, environmental, and governance dimensions. An alternative approach to defining the dimensions of CSR is through identifying the interests of stakeholders. The most common groups of stakeholders of construction companies referred to in the literature are shareholders, employees, customers, local communities, suppliers and partners, government, competitors, environment. CSR in the construction industry is shaped by external factors, which we categorize into mandatory rules, social pressures, the CSR infrastructure, market pressures, and technological factors. We introduce the CSR infrastructure as a separate external factor because of its scope and role in promoting CSR and removing barriers to its adoption. We stress the role of technological innovations and green building practices in the CSR implementation in the construction industry. The internal factors that stimulate or impede the adoption CSR by a construction company include the company’s values, vision, culture, strategies and the leadership. We emphasize the importance for the construction industry to use a holistic approach to CSR, considering the impacts within the entire value chainДокумент Culture shock in media discourse: philosophical analysis(Національний технічний університет "Харківський політехнічний інститут", 2024) Dezhong, WangThe article examines the philosophical opinion of Confucius about benevolence as the core of culture and the justification of the idea of its achievement; it is found that the followers of Confucius studied and improved his teachings, enriching the concept of benevolence and shaping the cultural spirit of the Chinese people. The role of Confucianism in the formation of its unique national character is proven. Challenges to the traditional Chinese concept of kinship from the culture of numbers are considered, which affects political life, education, and everyday life. Thanks to the analysis of the discourse of the media space, the influence of digital media on culture as a whole, as well as the inevitability of culture shock between traditional culture and the culture of the digital, is substantiated.Публікація Development and research of software solution for business process model correctness analysis using machine learning(Національний технічний університет "Харківський політехнічний інститут", 2024) Kopp, Andrii Mykhailovych; Orlovskyi, Dmytro Leonidovych; Litvinova, Uliya SerhiivnaPoorly designed business process models are a source of errors and the subsequent costs associated with these errors, such as monetary costs, lost time, or even some harmful impact on people or the environment if the erroneous business process models are associated with critical industries. The BPM (Business Process Management) lifecycle usually consists of designing, implementing, monitoring, and controlling the business process execution, but it lacks continuous quality control of the created BPMN (Business Process Model and Notation) models. Thus, this paper considers the problem of business process models classification based on their correctness, which solution will ensure quality control of the designed business process models. Thus, this study aims to improve the quality of business process models by developing a software solution for business process models classification based on their correctness. The subject of the study is the process of business process models classification based on their correctness, which uses quality measures and thresholds, usually, complexity measures. The subject of the study is a software solution for business process models classification based on their correctness. Therefore, in this study, the algorithm to solve the problem of BPMN models classification using logistic regression, interface complexity, and modularity measures is proposed, the software requirements are determined, the software development tools are selected, the software for business process models classification based on their correctness is designed, the corresponding software components are developed, the use of a software solution for solving the problem of business process models classification based on their correctness is demonstrated, the obtained results are analyzed and discussed. The developed software indicates high performance of BPMN models classification based on their correctness, achieving high accuracy (99.14 %), precision (99.88 %), recall (99.23 %), and F-score (99.56 %), highlighting the high performance of modeling errors detection.Документ Employees with disabilities as internal stakeholders of organisations(Національний технічний університет "Харківський політехнічний інститут", 2024) Manczak, Iryna; Bajak, MariaOrganisation should strive to develop lasting relationships with its stakeholders, particularly its employees, who are the cornerstone of the institution’s activities. For this purpose, its strategy should include activities aimed at developing and equalising opportunities for all employees, including those with disabilities. This article aims to present the issue of employees with disabilities as internal stakeholders of an organisation. It outlines areas of support for the analysed social group, including the values provided by the institution. Measures applicable to implementing the concept of corporate social responsibility towards the social group under analysis are also outlined.Документ Energy and operational analysis of continuous surveillance systems based on multirotor UAVs(Національний технічний університет "Харківський політехнічний інститут", 2024) Los, Andrii; Veligorskyi, OleksandrDrones are used in many applications, including continuous surveillance and monitoring. They can be used in cases, when the deployment time of surveillance system should be as fast as possible, or when a centralized electric grid is not available: accompanying fire extinguishing and liquidation of emergencies, 24/7 surveillance of the border area, monitoring of open-air events. They also can be used as stationary cameras, carrier of means of radio-electronic intelligence, weather conditions intelligence in airport areas, monitoring of crops, etc. The optimal solution for surveillance of large areas, such as critical infrastructure facilities (nuclear power plants, dams), and military facilities (field bases, ammunition warehouses), is the utilization of a group of drones when a single drone will observe his sector. The development of such systems and analysis of conditions for continuous surveillance taking into account the limitations of drone batteries require deep studies of drone energy consumption in various operation modes. The paper proposes a comprehensive investigation of operation modes of continuous surveillance systems, based on drones with electric-supplied propulsion systems, and optimization of its parameters. In the study, a comprehensive analysis of drones’ energy demands was done and conditions for continuous surveillance were found. Finally, the conclusion was set that external parameters, such as wind speed and direction, can significantly decrease the achievable distance to the observing point.Публікація Game theory as a tool for making optimal business decisions in foreign economic activity of enterprises(Національний технічний університет "Харківський політехнічний інститут", 2024) Havrys, Olha; Sun, Changan; Kuchina, Svetlana; Gavrys, MykolaThe article is devoted to the study of the effectiveness of game theory in making business decisions regarding foreign economic activity by enterprises in conditions of uncertainty. The sources of information on this issue were analyzed and it was found that further development of the application of game theory in the foreign economic activity of enterprises is necessary. It has been established that the ambiguity of economic development trends, which has been especially evident in recent years in Ukraine and the world, and the instability of the market regulation mechanism encourage enterprises to look for new ways to overcome uncertainty in their activities. When solving economic problems, conflict situations often arise, which are caused by the conflicting interests of various structures. The mathematical apparatus for solving this type of problem is game theory, which is the theory of building mathematical models of optimal decision-making in conflict conditions. Game theory is a theoretical direction in science, a set of methods of mathematical analysis and assessment of the rules of behavior of participants in a conflict situation, which involves the interaction of two or more participants (players) in order for each of them to achieve their goals. The advantages of game theory are analyzed, in particular, the possibility of formalizing the process of considering typical scenarios of decision-making by the parties to the conflict and choosing the procedure for coordinating interests that will be optimal for all its participants. The main concepts, principles and classifications of game theory are presented, the foundations for understanding the use of game theory in economics are laid. Analyzing the usefulness of game theory in market competition, development of enterprise development strategy, investment activities and other areas, the possibility of wide application and effectiveness of game theory in decision-making regarding foreign economic activities of enterprises is shown.Документ GAP-аналіз у публічному управлінні розвитком безпечного середовища в сільських територіальних громадах України(Національний технічний університет "Харківський політехнічний інститут", 2024) Бульба, Володимир Григорович; Оробей, Віктор ВікторовичУ статті переосмислено класичний підхід до використання методу GAP-аналізу, розглянуто можливості його використання у публічному управлінні сільськими територіями та оцінювання інноваційних підходів, відповідно до стратегічних напрямів щодо розвитку соціальної сфери. Розроблено та запропоновано рекомендації щодо вдосконалення наявних інноваційних підходів. Доведено, що для збереження сільських територій в Україні в умовах російсько-української війни та у післявоєнний період важливим стратегічним пріоритетом публічного управління є розвиток безпечного середовища в сільській громаді (концепція «Безпечна громада», поліцейські станції, електронні послуги, концепція Zero waste, захист навколишнього середовища).Документ Identification of the coefficient in the diffusion model of hydrodynamic flow in a chemical reactor(Національний технічний університет "Харківський політехнічний інститут", 2024) Gamzaev, Kh. M.; Bayramova, N.Kh.A chemical technological process taking place in a chemical reactor with a second-order chemical reaction is considered. A one-parameter diffusion model for nonstationary flows is proposed for the mathematical description of the hydrodynamic flow in the reactor. Within the framework of the proposed model, the task is set to identify the longitudinal mixing coefficient according to an additionally specified condition regarding the concentration of the reagent under study at the outlet of the reactor. A special representation is proposed for the diffusion terms in the hydrodynamic flow model in the reactor. The method of difference approximation is used to construct a discrete analogue of this model using explicit-implicit time approximation for diffusion terms. Decomposition is used to numerically solve the resulting system of linear difference equations, as a result of which the system of difference equations for each discrete value of a time variable splits into two mutually independent linear subsystems, each of which can be solved independently, independently of each other. As a result, an explicit formula was obtained for determining the approximate value of the longitudinal mixing coefficient in a hydrodynamic flow. Based on the proposed computational algorithm, numerical calculations were performed for model problems.Документ Implementation of gamification for international companies throughout rebranding: current and possible future approaches(Національний технічний університет "Харківський політехнічний інститут", 2024) Pazii, DmytroIn an ever-evolving and dynamic global business landscape, characterized by rapid technological advancements and shifting consumer prefe rences, international companies are continually seeking to enhance their branding strategies through the adop tion of innovative methodologies. One such approach that has garnered significant attention and adoption is the strategic integration of gamification throughout the rebranding process. Extensive market analysis indicates that gamification has emerged as a highly effective tool in not only capturing the attention of key stakeholders but also in fostering deeper engagement among employees, customers, and partners alike. This engagement, in turn, cultivates a pr ofound sense of involvement and loyalty towards the brand, thereby contributing to its long-term success and sustainability in the competitive marketplace. Furthermore, this article goes beyond mere theoretical discourse by presenting meticulously selected real-world examples that showcase the successful deployment of various gamification strategies within international companies undergoing rebranding initiatives. These strategies range from immersive interactive challenges to captivating social media contests, each tailored to suit the specific objectives and target audience of the rebranding campaign. By delving into both current industry practices and exploring potential future avenues, this comprehensive exploration sheds light on the transformative potential of gamification in rebranding efforts. It underscores the pivotal role played by gamification in driving organizational evolution and in fostering enduring brand resonance that transcends geographical boundaries and cultural barriers. As businesses continue to adapt to the ever-changing landscape, harnessing the power of gamification in rebranding endeavors emerges as a strategic imperative for maintaining relevance and achieving sustained growth in the global marketplace.Документ Integrating advanced human-computer interaction and machine learning models for optimizing VR systems in educational and business applications(Національний технічний університет "Харківський політехнічний інститут", 2024) Tao, Li; Honcharenko, TetyanaThis paper presents the development of an advanced Human-Computer Interaction (HCI) model and algorithm integrating Natural Language Processing (NLP) to optimize Virtual Reality (VR) systems for educational and business applications. The proposed model enhances user experience and operational efficiency by addressing interface design, user engagement, real-time data processing, and accessibility. Continuous learning and contextual data integration ensure adaptive and personalized interactions, improving the functionality and applicability of VR environments.Публікація International investments and venture capital in the context of growing economic security: challenges for trade organization in EU countries(Національний технічний університет "Харківський політехнічний інститут", 2024) Novik, Iryna; Suslikov, Stanislav; Matrosova, Victoria; Honchar, IrynaThis document extensively examines the challenges faced by EU countries in organizing trade amidst the presence of international investments and venture capital within the context of increasing economic security. The article discusses the impact of venture capital and international investments on the development of the country, analyzing their influence on economic security in EU countries. As a result of investments, on one hand, the country gains more opportunities for positive development across various sectors and promotes active engagement in implementing new ideas into the realm of trade. On the other hand, new tasks arise for the country regarding the regulation and organization of trade, as well as control over capital and the overall state of the economy. Additionally, the article explores strategies that can be utilized to ensure effective trade organization amidst growing economic stability. The pace of modern trade development always demands proactive measures to improve trade processes. Therefore, countries need to continuously evolve, implement new ideas, and ensure the economic security of the nation to remain competitive and foster trade growth. The state of investment and innovation security of Ukraine was considered. The main challenges and threats in the field of investment and innovation security were identified. As a result of the systematization of the main provisions related to international investments and venture capital in the conditions of growing economic security, the main tasks in the field of ensuring the economic security of the state and for the organization of trade in the EU countries were proposed.Документ Management of archive and library institutions: expert evaluation of the quality of activities(Національний технічний університет "Харківський політехнічний інститут", 2024) Bachynska, Nadiia; Tverytnykova, Elena; Drozdova, Tetiana; Salata, HalynaThe use of information technologies in the practical activities of archival and library institutions is becoming more and more widespread. This actualizes the study of the issue of library and archive management and the implementation of quality management systems in the activities of libraries and archives. This problem is exacerbated by the current emergency situation in which archival and library institutions operate. Therefore, it is necessary to involve modern approaches to assessing the quality of library and archive management. The use of expert methods for evaluating multi-faceted systems has a long tradition. Expert assessment methods are used in various fields, in particular, during crisis situations of managerial and socio-economic problems, analysis and forecasting having a large number of social factors. The involvement of a number of methods of related disciplines, including interviewing, questionnaires, surveys, the Delphi method, brainstorming, conference of ideas, etc., contribute to the effective analysis of the management system of a scientific or educational institution. The implementation of the method of expert evaluations in the work of scientific institutions, in particular the archival and library direction, is especially relevant, since the problems of ensuring the quality of their activities are solved with the help of these methods. The quality of activity of the scientific and technical library and archive based on the involvement of experts from three groups was monitored. These are representatives of the teaching staff, researchers and students. The evaluation of such indicators as the process of quality information support of education and research was carried out; the process of reengineering and maximum automation; the process of providing library and archival services. As a result, the positive and weak points of the library and archive institution management were revealed. Based on the results of the analysis, the top management of archival and library institutions should set the new goals regarding the quality level of library and archival services provided, establish a strategy for increasing user satisfaction, assessing the suitability of the structure and resources for future development.Документ Masstransfer features in the apparatuses with a moving nozzle in a three-phase foam layer(Національний технічний університет "Харківський політехнічний інститут", 2024) Manoilo, Evgenia V.; Manoilo, Yuriy O.; Repko, Kalif Y.; Zhuha, Oleg O.; Davydov, Denis V.; Arslanaliiev, Tymur M.The improvement of heat and mass exchange equipment for sorption processes in the countercurrent contact of gas and liquid in combined block elements with a weighted spherical nozzle, as well as a more in-depth study of this process, is an urgent task of chemical technology. A fundamentally new type of ball-shaped three-dimensional mesh fluidized nozzle was developed and researched, the bodies of which are made of polymer layers with holes, and a freely coiled metal or polymer mesh is located inside. The nozzle has a high specific surface area, developed free volume and low bulk density. The study of mass transfer in the liquid and gas phases was carried out and the corresponding calculation equations were obtained. Dependencies for the calculation of the mass transfer coefficients and the efficiency of the combined block element on the mode and design parameters are established. The results of calculations based on the obtained dependencies show a sufficient correlation with the experimental data. The proposed model of the desorption process of carbon dioxide from water, which allows predicting the values of the efficiency indicators of the decarbonization process. It was established that the use of a combined block element with a ball-shaped nozzle allows to increase the mass transfer coefficients compared to the failure plate. The industrial implementation of absorption processes in the foam layer and the use of the gas-liquid layer stabilization method significantly expands the scope of application of foam apparatuses and opens up new opportunities for intensifying technological processes. Previously expressed assumption about the perspective of using mesh materials for the manufacture of nozzle bodies was confirmed by experiments, but the peculiarity of the operation of devices with similar nozzles should be emphasized.Документ Modification of frictional surfaces of bearings by addition of nanoparticle compositions to lubricants(Національний технічний університет "Харківський політехнічний інститут", 2024) Lyubchenko, Olena; Gapochenko, SvitlanaThe results of a study of the effect of additives to lubricating oils on changes in the structure of the friction surface and, as a consequence, the tribological characteristics of the "steel to steel" friction pair are presented. The experiments were conducted using a standard "disk-disk" scheme on a friction machine with double cycles of step loading. The material of the disks was bearing steel ШХ-15 with a hardness of 61-63 HRC. Changes in the surface structure were monitored using a binocular microscope. A detailed study of the friction surfaces was carried out using a scanning electron microscope. The microhardness of the friction surfaces was also measured before and after loading. Quantitative changes in the surface relief were determined using a profilometer. The study of the friction surface, conducted using X-ray fluorescence analysis, revealed changes in the composition of the surface layer, which can be explained by the formation of a surface servovite film, which includes elements from the used additive to lubricant (silicon, magnesium, manganese, aluminum, sulfur). The increase in the microhardness of the friction surface when working with the additive from 4.1 GPa to 6.6 GPa, which has a positive effect on the tribological characteristics, is also explained by the formation of a servovite film, which can significantly improve the friction conditions, as well as reduce damage and wear of surfaces. Using scanning electron microscopy, surface waviness oriented at large angles (close to the normal) to the direction of deformation during friction was revealed. It was assumed that the reason for the formation of such a surface relief is microplastic deformation under the action of bias stresses arising in the surface layers of the friction pair. The structural changes observed during friction with the use of a lubricant additive support the assumption of the formation of a ceramic (servovite) film, which has a significantly greater reserve of plasticity compared to a surface with an oxide film, usually present on the surface during friction with a lubricant without an additive.Документ Optimal distribution of limited resource in a context of uncertainty(Національний технічний університет "Харківський політехнічний інститут", 2024) Raskin, Lev; Sukhomlyn, Larysa; Hatunov, Artur; Andriienko, SerhiiObject of research: methods of rational distribution of limited resource in a context of uncertainty. It is assumed that the system consists of a set of independently functioning elements, and effectiveness of these elements depends on the level of investment. The complexity of solving the problem using traditional methods depends on and is determined by the type of analytical description of production functions of the system elements. Significant difficulties arise if parameters of production functions are uncertain quantities, specified, for example, in terms of fuzzy mathematics. This circumstance emphasizes the relevance of studying approaches to solving the set problem of resource distribution for the case when its parameters are not clearly defined, and this circumstance also determines the goal of the work. Problems arising from the goal consist in developing mathematical models and methods for rational resource distribution for the main types of production functions with their parameters being fuzzy numbers of (L-R) type. To solve these problems, a method is proposed that transforms the original fuzzy problems into clear ones that can be solved using standard constrained optimization technologies. An important result of the research consists in the fact that the proposed method is universal, that is, it is applied in the same way to solve problems of resource distribution in systems wherein production functions of the elements can be of arbitrary nature.Документ Optimization of the development process of monolithic multi-module projects in Java(Національний технічний університет "Харківський політехнічний інститут", 2024) Veres, Maksym Dmytrovych; Golian, Natalia ViktorivnaIn recent years, there has been an increase in the complexity of Java software development and a change in the scope of projects, including an increase in the number of modules in projects. The multi-modularity of projects, although it improves manageability to a certain extent, but often creates a number of problems that can complicate development and, a problem that will appear in the future, require more resources to support. This article will analyze the main problems of monolithic multi-module Java projects and will try to consider a number of possible solutions to overcome the above problems. The article discusses the peculiarities of working with multi-module monolithic projects using Java as the main programming language. The purpose of this article is to identify features and obstacles using the above architectural approach of the software, analysis of the main possible issues of working with the monolithic multi-module Java projects, as well as providing recommendations for eliminating these obstacles or describing the features of the process that could help engineers in supporting this kind of projects. In other word the main goal of this work is to create recommendations, provide modern best practices for working with monolithic multi-modular software architecture and the most popular modern technological solutions used in corporate development. The proposed recommendations allow the team, primarily developers and the engineering side, to avoid possible obstacles that lead to the loss of efficiency of the monolithic software development process. The most important advantage, from the recommendations given in the article, is the optimization of resource costs (time, money and labor) for the development process. As a result of the article, a general list of recommendations was obtained, which allows the developer to better analyze what changes in the project should (if necessary) be made to optimize the development, assembly and deployment processes of a monolithic Java project, as well as advice before designing new software to avoid the main obstacles of monolithic architecture in the future.Документ Peculiarities of ecologically oriented recreational complexes of Europe(Національний технічний університет "Харківський політехнічний інститут", 2024) Levytska, Olena HryhoriivnaThe demand for safe recreation conditions is growing every day. Therefore, hotels, lodges which acquire ecological characteristics, improving the interiors of the premises, the exterior of the territories, causing green areas and growing organic products, supporting the ideas of resource conservation and remediation of territories. The purpose of this article is to evaluate the most successful tourism eco-projects in Europe, to identify environmental criteria that attract vacationers and improve the quality of the environment, to evaluate the service, natural attraction and creativity of holiday destinations, to make a comparative description of hotels and resorts located in different natural areas. Service, proximity to nature and the satisfaction of visitors with interaction of nature, design of the exterior and interior, the availability of exclusive decor items, and non-standard leisure activities are the three important criteria for choosing a hotel or resort today. These three criteria were studied by the method of manual analysis of visitor reviews. Most often vacationers mention natural beauty, somewhat less often – service, and quite rarely – creativity in the design and organization of recreation. For the first time, the most successfully functioning ecological resorts in Europe are divided into groups by location and natural resources. The requirements for resorts that are popular among the visitors have been formed. The criteria of service, natural advantages and creativity in different groups are compared.