Challenges and Issues of Modern Science
type: channel
description: DOAS: The Diamond OA Standard Challenges and Issues of Modern Science (ISSN 3083-5704) is an interdisciplinary academic publication that publishes original research papers dedicated to cutting-edge advancements across various interconnected fields. The journal welcomes submissions encompassing all stages of the life cycle of innovative products within mechanical engineering, applied mechanics, materials science, aerospace engineering, electrical engineering, power engineering, and electronics — from conceptualization and design to realization, operation, and disposal. The aim is to enhance manufacturing processes, improve product quality, and ensure its resilience in contemporary production, considering the environmental impact, as well as economic, managerial, market, financial, and marketing strategies in conjunction with modern advancements in information technology, cybersecurity, automation, and robotics. The primary goal of the journal is to establish a platform for knowledge exchange between scientists and practitioners operating at the intersection of diverse disciplines, employing a comprehensive approach for analyzing challenges and synthesizing innovative solutions, further enriched by a focus on digital transformation, artificial intelligence, and the principles of sustainable development. More... List of Study Fields for Submissions according to ISCED-F 2013: 0311 Economics 0412 Finance, banking and insurance 0413 Management and administration 0414 Marketing and advertising 0416 Wholesale and retail sales 0612 Database and network design and administration 0613 Software and applications development and analysis 0712 Environmental protection technology 0713 Electricity and energy 0714 Electronics and automation 0715 Mechanics and metal trades 0716 Motor vehicles, ships and aircraft 0788 Inter-disciplinary programmes and qualifications involving engineering, manufacturing and construction By sections...
publisher: Oles Honchar Dnipro National University
language: en
publication name: Challenges and Issues of Modern Science
issn: 3083-5704
copyright: All articles published in the journal Challenges and Issues of Modern Science are licensed under the Creative Commons Attribution 4.0 International (CC BY) license. This means that you are free to: Share, copy, and redistribute the article in any medium or format Adapt, remix, transform, and build upon the article as long as you provide appropriate credit to the original work, include the authors' names, article title, journal name, and indicate that the work is licensed under CC BY. Any use of the material should not imply endorsement by the authors or the journal.
items: Physics-Informed Neural Networks in Aerospace: A Structured Taxonomy with Literature Review
items: Evaluation of dynamic characteristics of a linear time-varying system
items: The Impact of Emotionally Driven Service on Customer Loyalty in the Beauty Services Sector
items: An Empirical Analysis of Turkey’s Foreign Trade Trends: 2015 – 2024
items: Modeling fin efficiency considering transverse temperature gradients in rocket engine cooling channels
items: Austenite Stability and Wear Resistance of High-Manganese Steels
items: Wet wipes in green ecosystems of Chernihiv, Ukraine
items: Structure and physical properties of the rapidly cooled amorphous alloy FeCo0,854Nb0,146NiB0,7Si0,3
items: Current State of Renewable Energy Development in Ukraine and Possible Solutions
items: Economic growth of countries in the context of military operations
items: Flexible Leadership as the Key to Effective Project Team Management
items: Improvement of data flow management in the air traffic control automation system
items: Multi-criteria optimization of composite panels with rib reinforcement under combined loading
items: Optimizing Material and Technology Selection for Cost-Effective Equipment Performance
items: Transfer Function of a Time-Varying Control System Considering Actuator Inertia
items: Open-source analysis of the potential configuration and kinetic performance of the Oreshnik ballistic missile
items: Integration of Emotional Intelligence and Neuropsychological Approaches into Educational Crisis Management
items: Elasticity-Driven Fare Optimization in U.S. Air Travel Segments
items: Statistical Analysis and Forecasting of Injury-Related Road Accidents in Dnipropetrovsk Region
items: Optimization Problem of the Launch Vehicle Pitch Angle during Spacecraft Insertion into Circular Orbits
items: On the modification of direct methods for solving optimal control problems of stationary thermal processes

Physics-Informed Neural Networks in Aerospace: A Structured Taxonomy with Literature Review
type: item
description: Section: Aerospace vehicles Categories: Artificial Intelligence, Aerospace Engineering Keywords (enter each keyword separately and confirm each by pressing Enter): Physics-Informed Neural Networks (PINNs), aerospace engineering, machine learning, mathematical simulation, flight vehicles, aerospace design Purpose. This study aims to develop a structured four-tier taxonomy that systematically organizes aerospace engineering tasks suitable for the application of Physics-Informed Neural Networks (PINNs), while validating this classification through a literature review and identifying opportunities for future research. Design / Method / Approach. The methodology involves grouping tasks into four distinct tiers—Physical Modeling, Dynamic Analysis, Functional Assessment, and System-Level Assessment—based on their physical, operational, and systemic characteristics. This framework is subsequently populated with real-world examples derived from the analysis of 145 peer-reviewed studies. Findings. The reviewed literature confirms a balanced distribution of PINNs applications across all tiers. Contrary to initial assumptions, studies were identified even in areas previously presumed underrepresented, such as acoustic modeling, optical simulations, and environmental impact assessment. This outcome reveals the broader applicability of PINNs and calls for a reassessment of current assumptions regarding underexplored domains. Theoretical Implications. The proposed taxonomy offers a coherent framework for structuring interdisciplinary PINNs applications by integrating physics-based modeling with machine learning across aerospace engineering contexts. Practical Implications. It provides engineers and researchers with a practical roadmap for selecting PINNs methods tailored to specific problem types, potentially improving computational efficiency and enhancing predictive accuracy in aerospace design and analysis. Originality / Value. The study’s originality lies in its empirically va…
subject: Aerospace vehicles
  topic: section
subject: Artificial Intelligence
  topic: category
subject: Aerospace Engineering
  topic: category
subject: Physics-Informed Neural Networks (PINNs)
  topic: keywords
subject: aerospace engineering
  topic: keywords
subject: machine learning
  topic: keywords
subject: mathematical simulation
  topic: keywords
subject: flight vehicles
  topic: keywords
subject: aerospace design
  topic: keywords
creator: Yurii Tkachov
creator: Oleh Murashko
rights: Copyright (c) 2025 Yurii Tkachov, Oleh Murashko (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 4
ending page: 28
doi: 10.15421/cims.4.313

Evaluation of dynamic characteristics of a linear time-varying system
type: item
description: Section: Control Systems, Telecommunications and Navigation Categories: Computational Theory and Mathematics, Aerospace Engineering, Control and Systems Engineering Keywords (enter each keyword separately and confirm each by pressing Enter): time-varying control system, transfer function, equivalence criterion, Levenberg-Marquardt algorithm Purpose. The development of methodological support for the construction of an algorithm for calculating the coefficients of the transfer function of the second order link, which is equivalent to a time-varying system in the selected time interval from the point of view of the smallest average value of the modulus of the difference of dimensionless state vectors. Design / Method / Approach. Mathematical models of a time-varying system and a second-order link are used, along with a criterion that determines the transfer function coefficients. The Levenberg-Marquardt algorithm finds the minimum, and the Runge-Kutta algorithm solves differential equations. The output of the time-varying system is obtained numerically, while the second-order link’s output is an analytical solution. Findings. Based on the calculations carried out for the selected data example, the possibility of determining the transfer function coefficients of the second-order link is shown, which, from the point of view of the smallest average value of the modulus of the difference of dimensionless state vectors on the selected time interval, is equivalent to time-varying system. Theoretical Implications. It is possible to have an estimate of the margin of stability, type and duration of the transient process during the selected time interval of the system operation by using the mathematical apparatus of linear stationary systems. Practical Implications. It leads to the expansion of the methodological base of analysis and synthesis of linear time-varying systems. Originality / Value. It lies in the using the Levenberg-Marquardt method to determine the coefficients of…
subject: Control Systems, Telecommunications and Navigation
  topic: section
subject: Computational Theory and Mathematics
  topic: category
subject: Aerospace Engineering
  topic: category
subject: Control and Systems Engineering
  topic: category
subject: time-varying control system
  topic: keywords
subject: transfer function
  topic: keywords
subject: equivalence criterion
  topic: keywords
subject: Levenberg-Marquardt algorithm
  topic: keywords
creator: Volt Avdieiev
rights: Copyright (c) 2025 Volt Avdieiev (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 69
ending page: 72
doi: 10.15421/cims.4.250

The Impact of Emotionally Driven Service on Customer Loyalty in the Beauty Services Sector
type: item
description: Section: Project Management and Leadership Categories: Marketing, Strategy and Management Keywords (enter each keyword separately and confirm each by pressing Enter): emotional service, customer loyalty, beauty industry, personalized service, non-verbal communication, client experience Purpose. This article aims to theoretically substantiate and empirically investigate the impact of emotional service on customer loyalty in the beauty industry. It identifies key emotional interaction factors that enhance customer satisfaction and the competitive advantage of beauty service providers. Design / Method / Approach. The study employs an empirical approach based on a survey conducted at the “Women Place” beauty salon in Odesa, Ukraine. Forty regular clients participated, evaluating the significance of emotional and personalized service components. Data was analyzed using descriptive statistics and visualized through percentage-based charts. Findings. The research reveals that personalized communication, staff politeness, cleanliness, interior design, music, and aromatherapy influence customer loyalty. Emotional service plays a critical role in shaping positive client experiences and strengthening brand affiliation. Clients value not only service quality but also the emotional atmosphere and individual approach. Theoretical Implications. This study contributes to understanding emotional service as a strategic tool for loyalty development in the Ukrainian beauty industry. It broadens the theoretical framework by integrating emotional labor, non-verbal communication, and personalization into customer behavior analysis. Practical Implications. The findings offer practical recommendations for beauty business managers to improve emotional interaction processes, implement CRM systems, and develop customer-oriented strategies to retain clientele and reduce churn. Originality / Value. This is one of the first comprehensive empirical studies in Ukraine examining emotional service in…
subject: Project Management and Leadership
  topic: section
subject: Marketing
  topic: category
subject: Strategy and Management
  topic: category
subject: emotional service
  topic: keywords
subject: customer loyalty
  topic: keywords
subject: beauty industry
  topic: keywords
subject: personalized service
  topic: keywords
subject: non-verbal communication
  topic: keywords
subject: client experience
  topic: keywords
creator: Yelyzaveta Kravchuk
creator: Oleksandr Krupskyi
rights: Copyright (c) 2025 Yelyzaveta Kravchuk , Oleksandr Krupskyi (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 101
ending page: 108
doi: 10.15421/cims.4.274

An Empirical Analysis of Turkey’s Foreign Trade Trends: 2015 – 2024
type: item
description: Section: Market Synergy Categories: Economics and Econometrics, Finance Keywords (enter each keyword separately and confirm each by pressing Enter): Turkish economy, trade balance, export, import, foreign trade, trade deficit Purpose. This article analyzes the trade balance of the Republic of Türkiye for 2015–2024, examining import–export dynamics over a ten-year interval and identifying the main drivers of the persistent deficit. Design / Methodology / Approach. The study draws on data from Trade Map, international trade statistics for business development, TURKSTAT, and open-data releases from other organizations; annual trade values and year-over-year growth rates were compared using descriptive statistics and time-series comparisons to assess trends and bilateral flows. Findings. Throughout the period, import values consistently exceeded export values, generating a sustained trade deficit. Although exports grew steadily, the faster rate of import growth resulted in a widening gap, indicating that Türkiye purchased more goods and services abroad than it sold. Theoretical Implications. The results underscore the value of empirical statistical analysis for understanding structural trade imbalances and support refinement of theoretical models addressing trade deficits in emerging economies. Practical Implications. Strategic imports—particularly energy products and industrial raw materials—have driven the deficit, with substantial volumes sourced from Russia and China; these insights can inform targeted import-substitution policies and measures to strengthen domestic production. Originality / Value. The research synthesizes multiple data sources to present updated empirical insights into Türkiye’s principal export markets (Germany, the USA, the UK) and largest import partners (China, Russia), and highlights diversification toward Asian and Caucasus nations over the study period. Research Limitations / Future Research. Future research should employ mathematical modeli…
subject: Market Synergy
  topic: section
subject: Economics and Econometrics
  topic: category
subject: Finance
  topic: category
subject: Turkish economy
  topic: keywords
subject: trade balance
  topic: keywords
subject: export
  topic: keywords
subject: import
  topic: keywords
subject: foreign trade
  topic: keywords
subject: trade deficit
  topic: keywords
creator: Esmer Aliyeva
rights: Copyright (c) 2025 Esmer Aliyeva (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 122
ending page: 126
doi: 10.15421/cims.4.285

Modeling fin efficiency considering transverse temperature gradients in rocket engine cooling channels
type: item
description: Section: Engines, Energy and Thermotechnics Categories: Aerospace Engineering, Computational Mechanics Keywords (enter each keyword separately and confirm each by pressing Enter): mathematical model of heat transfer, transverse temperature non-uniformity, liquid propellant rocket engine, cooling channels of the engine chamber Purpose. This study aims to improve the accuracy of methods for determining fin efficiency. Its goal is to derive calculation relationships for finning coefficients that account for transverse temperature non-uniformity within the fin cross-section. Design / Method / Approach. The article presents the reduction of the heat conduction equation for a fin to a dimensionless form, based on dimensional analysis of the variables involved. Further development relies on analyzing the results of numerical simulations and their subsequent generalization. To this end, the gradient descent method is applied, minimizing the quadratic error function. Findings. A criterial dependence has been formulated to complement the derived heat conduction equation. Test calculations and comparisons with numerical simulations in Ansys Fluent confirm an improvement in calculation accuracy when using the proposed equation. Theoretical Implications. This paper addresses factors previously neglected in the analysis of heat transfer in fins. The results of the study thus complement existing approaches to determining finning coefficients. Practical Implications. The derived criterial relationship will enhance the accuracy of heat transfer calculations in the chambers and gas generators of liquid rocket engines. Originality / Value. The paper introduces an original criterial relationship that accounts for temperature non-uniformity across the fin cross-section. Incorporating this factor improves calculation accuracy, highlighting the practical value of the developed equation. Research Limitations / Future Research. This study focuses on rectangular fins; therefore, the proposed…
subject: Engines, Energy and Thermotechnics
  topic: section
subject: Aerospace Engineering
  topic: category
subject: Computational Mechanics
  topic: category
subject: mathematical model of heat transfer
  topic: keywords
subject: transverse temperature non-uniformity
  topic: keywords
subject: liquid propellant rocket engine
  topic: keywords
subject: cooling channels of the engine chamber
  topic: keywords
creator: Volodymyr Sliusariev
creator: Valerii Bucharskyi
rights: Copyright (c) 2025 Volodymyr Sliusariev, Valerii Bucharskyi (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 43
ending page: 47
doi: 10.15421/cims.4.299

Austenite Stability and Wear Resistance of High-Manganese Steels
type: item
description: Section: Structural and Functional Materials Categories: Mechanics of Materials, Metals and Alloys Keywords (enter each keyword separately and confirm each by pressing Enter): high-manganese steel, austenite, martensitic transformation, wear resistance, plastic deformation Purpose. Classification of wear-resistant components used in metallurgical equipment by category and optimization of high-manganese steel selection. Design / Method / Approach. The study was conducted on steels produced in induction furnaces with water quenching at 1050 °C. Samples of 5 × 3 × 3 mm³ were subjected to slow plastic deformation by compression. The degree of deformation was determined by the ratio of the sample thickness before and after deformation. The magnetic state was evaluated by the magnetometric method using a Faraday balance. Findings. At 20–30% deformation, 110Mn8 formed 2.787 vol.% α′-martensite, 110Mn10 – 0.263 vol.%, 110Mn13 – 0.107 vol.%, and 110Mn18 – 0.006 vol.%. Steels 110Mn8 and 110Mn10 exhibit low austenite stability, while 110Mn13 and 110Mn18 are metastable. A classification of parts by operating conditions was proposed: I – especially critical purpose (110Mn13, 110Mn18), II – critical purpose (110Mn10), III – general purpose (110Mn8). Theoretical Implications. The study enhances understanding of the role of martensitic transformation in the wear resistance of high-manganese steels and clarifies the relationship between chemical composition and austenite stability. Practical Implications. The classification enables optimized steel selection for parts based on operating conditions, reducing material costs and improving equipment reliability. Originality / Value. This is the first study to propose a classification of metallurgical equipment parts by categories, considering austenite stability, facilitating rational material selection. Research Limitations / Future Research. Future research should explore the effects of additional alloying elements and compare them wit…
subject: Structural and Functional Materials
  topic: section
subject: Mechanics of Materials
  topic: category
subject: Metals and Alloys
  topic: category
subject: high-manganese steel
  topic: keywords
subject: austenite
  topic: keywords
subject: martensitic transformation
  topic: keywords
subject: wear resistance
  topic: keywords
subject: plastic deformation
  topic: keywords
creator: Hennadii Snizhnoi
creator: Volodymyr Sazhnev
creator: Serhii Sheyko
creator: Olexandr Shapurov
creator: Anastasiia Hrechana
rights: Copyright (c) 2025 Hennadii Snizhnoi , Volodymyr Sazhnev, Serhii Sheyko, Olexandr Shapurov, Anastasiia Hrechana (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 48
ending page: 54
doi: 10.15421/cims.4.286

Wet wipes in green ecosystems of Chernihiv, Ukraine
type: item
description: Section: Ecology, industrial and environmental safety Categories: Environmental Engineering, Pollution Keywords (enter each keyword separately and confirm each by pressing Enter): wet wipes, sustainable materials, Sustainable Development Goals, environmental education Purpose. To assess the pollution of recreation areas in Chernihiv with wet wipes and raise schoolchildren’s awareness of the related environmental problems. Design / Method / Approach. Direct counting of wet wipes on 100 m² in summer and autumn 2024. A socio-pedagogical study of schoolchildren’s awareness was conducted through a lecture and an online questionnaire before and after the lecture. Findings. Wet wipes were found as litter in recreation areas, indicating a low level of public awareness of their environmental impact. The smallest number of wet wipes was recorded in well-maintained or rarely visited areas. The highest (7 wipes/100 m²) was found in frequently visited but uncleaned areas without trash bins. The lecture “EcoSecrets of Wet Wipes” resulted in a positive shift in students’ perceptions, making them more aware of wet wipes as environmental pollutants containing hazardous substances and microplastics. Theoretical Implications. The findings expand the understanding of the environmental hazard posed by wet wipes and emphasize the need to mitigate their negative impact, particularly by educating schoolchildren about wet wipe pollution. Practical Implications. Raising awareness among children about responsible wet wipe use and the need to enhance their biodegradability and environmental safety. This supports the achievement of Sustainable Development Goals by promoting more conscious consumption habits. Originality / Value. This study is the first ecological assessment of urban pollution caused by wet wipes in Ukraine and the first socio-pedagogical study on schoolchildren’s awareness of this issue. Research Limitations / Future Research. Further educational and awareness-raising activitie…
subject: Ecology, industrial and environmental safety
  topic: section
subject: Environmental Engineering
  topic: category
subject: Pollution
  topic: category
subject: wet wipes
  topic: keywords
subject: sustainable materials
  topic: keywords
subject: Sustainable Development Goals
  topic: keywords
subject: environmental education
  topic: keywords
creator: Nataliia Tkachuk
creator: Dariia Zahryva
rights: Copyright (c) 2025 Nataliia Tkachuk, Dariia Zahryva (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 139
ending page: 144
doi: 10.15421/cims.4.268

Structure and physical properties of the rapidly cooled amorphous alloy FeCo0,854Nb0,146NiB0,7Si0,3
type: item
description: Section: Structural and Functional Materials Categories: Electronic, Optical and Magnetic Materials, Surfaces, Coatings and Films Keywords (enter each keyword separately and confirm each by pressing Enter): multicomponent high-entropy alloy, metallic glass, amorphous film, relative electrical resistivity, soft magnetic properties, microhardness Purpose. The study aims to develop and characterize a new nanostructured FeCo0,854Nb0,146NiB0,7Si0,3 high-entropy metallic glass with enhanced soft magnetic and mechanical properties. The research seeks to explore the interplay between the alloy’s amorphous structure and its functional properties to advance the understanding of high-entropy metallic glasses. Design / Method / Approach. The amorphous films of the FeCo0,854Nb0,146NiB0,7Si0,3 alloy was synthesized using splat-quenching technique. The cooling rate, estimated based on the film thickness, was ~106 K/s. Structural properties were analyzed via X-ray diffraction (XRD), differential thermal analysis (DTA), and electrical resistivity measurements. Magnetic properties were assessed using a B–H curve tracer and vibrating sample magnetometer, while microhardness was measured with a PMT-3 tester. Findings. The alloy exhibits a fully glassy structure with a crystallite size of ~3 nm, low coercivity (40 A/m), high saturation magnetization (74 A·m2/kg), and microhardness ≥ 8000 MPa, indicating decent soft magnetic and mechanical properties. Theoretical Implications. The research provides significant insights into the role of atomic-size differences, configurational entropy, and thermodynamic parameters in stabilizing the glassy phase in high-entropy alloys. It advances the theoretical framework for designing high-entropy amorphous materials. Practical Implications. The characteristics of the material make it promising for use in electronic devices and mechanical engineering parts. Originality / Value. This study provides a comprehensive analysis of the high-entropy metallic gl…
subject: Structural and Functional Materials
  topic: section
subject: Electronic, Optical and Magnetic Materials
  topic: category
subject: Surfaces, Coatings and Films
  topic: category
subject: multicomponent high-entropy alloy
  topic: keywords
subject: metallic glass
  topic: keywords
subject: amorphous film
  topic: keywords
subject: relative electrical resistivity
  topic: keywords
subject: soft magnetic properties
  topic: keywords
subject: microhardness
  topic: keywords
creator: Oleksandr Kushnerov
creator: Valerii Bashev
creator: Serhii Ryabtsev
rights: Copyright (c) 2025 Oleksandr Kushnerov, Valerii Bashev, Serhii Ryabtsev (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 55
ending page: 60
doi: 10.15421/cims.4.284

Current State of Renewable Energy Development in Ukraine and Possible Solutions
type: item
description: Section: Ecology, industrial and environmental safety Categories: Energy Engineering and Power Technology, Renewable Energy, Sustainability and the Environment Keywords (enter each keyword separately and confirm each by pressing Enter): Renewable energy sources, wind power, wind energy potential, wind power plants in Ukraine, wind power plants, environmental factors Purpose. To examine the current state of development and implementation of renewable energy sources in Ukraine and to investigate the prospects for their utilization. Design / Method / Approach. The study analyzes the current state and prospects of renewable energy sources use worldwide and in Ukraine, presents the inventory and current status of wind power plants in Ukraine considering the impact of military actions. The most efficient wind energy installations for mining regions are identified, along with their advantages and disadvantages. Findings. The prospects for the use of wind energy installations to ensure the country’s energy security are established; it is emphasized that wind power plants (WPPs) represent one of the most competitive electricity generation technologies, with economic and ecological benefits. Theoretical Implications. The advantages of WPPs, conditions for their application, and promising directions for their use, including the possibility of placement on technogenically disturbed lands, are defined. Practical Implications. The existing WPPs in Ukraine, their current status, and the prospects for renewable energy development globally and nationally to ensure energy independence and security are analyzed. Originality / Value. The article provides original data on the current global status of renewable energy; it analyzes the relevance of renewable energy use during wartime and post-war periods for achieving energy independence through the deployment of WPPs on technogenically disturbed lands in mining regions. Research Limitations / Future Research. Further studies will focus o…
subject: Ecology, industrial and environmental safety
  topic: section
subject: Energy Engineering and Power Technology
  topic: category
subject: Renewable Energy, Sustainability and the Environment
  topic: category
subject: Renewable energy sources
  topic: keywords
subject: wind power, wind energy potential
  topic: keywords
subject: wind power plants in Ukraine
  topic: keywords
subject: wind power plants
  topic: keywords
subject: environmental factors
  topic: keywords
creator: Olha Medvedieva
creator: Zariana Halchenko
creator: Oleksii Demchenko
rights: Copyright (c) 2025 Ольга Медведєва, Заряна Гальченко, Олексій Демченко (Автор) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 145
ending page: 151
doi: 10.15421/cims.4.298

Economic growth of countries in the context of military operations
type: item
description: Section: Market Synergy Categories: Strategy and Management, Economics and Econometrics Keywords (enter each keyword separately and confirm each by pressing Enter): growth, military conflicts, growth models, machine learning, international aid Purpose. The purpose of the study is to assess the economic growth of Ukraine, Syria, and Palestine under wartime conditions, compare growth models (Solow, MRW, Romer, and a machine learning model), identify recovery factors, and develop recommendations for 2030. Design / Method / Approach. The study employs a comparative analysis of growth models, modified by a conflict intensity indicator, based on panel data from 1990–2023 (World Bank, UNESCO, IndexMundi). Random Forest, accounting for nonlinear relationships among variables (investments, education, R&D, international aid), was used for forecasting. Forecasts cover three scenarios for 2025–2030. Findings. The Romer model is the most accurate for Ukraine, projecting a GDP per capita of $13,456 (optimistic scenario, 2030). For Syria and Palestine, projections are $1,183 and $3,012, respectively. Random Forest predicts $23,792 for Ukraine, $6,819 for Syria, and $5,764 for Palestine. Key factors include international aid (29.8%), investments (24.6%), and conflict reduction (19.7%). Theoretical Implications. The study adapts growth models to wartime conditions, highlighting the advantages of endogenous models and machine learning for analyzing complex economies. Practical Implications. The findings contribute to developing recovery strategies, allocating international aid, and planning sustainable development in conflict-affected countries. Originality / Value. The originality lies in adapting models to wartime conditions, comparing their effectiveness, and applying Random Forest for forecasting. Research Limitations / Future Research. Limitations include a small sample size (72 observations), missing data, subjective assumptions, and omission of external shocks. Future research…
subject: Market Synergy
  topic: section
subject: Strategy and Management
  topic: category
subject: Economics and Econometrics
  topic: category
subject: growth
  topic: keywords
subject: military conflicts
  topic: keywords
subject: growth models
  topic: keywords
subject: machine learning
  topic: keywords
subject: international aid
  topic: keywords
creator: Olexandr Shapurov
creator: Oleksii Hrechanyi
creator: Volodymyr Stoiev
creator: Anatolii Karpelianskyi
creator: Alina Sosnovska
rights: Copyright (c) 2025 Olexandr Shapurov, Oleksii Hrechanyi, Volodymyr Stoiev, Anatolii Karpelianskyi, Alina Sosnovska (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 127
ending page: 132
doi: 10.15421/cims.4.288

Flexible Leadership as the Key to Effective Project Team Management
type: item
description: Section: Project Management and Leadership Categories: Organizational Behavior and Human Resource Management, Strategy and Management Keywords (enter each keyword separately and confirm each by pressing Enter): flexible leadership, project management, team collaboration, emotional intelligence, transformational leadership, servant leadership Purpose. This article aims to provide an in-depth analysis of modern leadership models in project management, with a particular focus on flexibility, emotional intelligence, service orientation, and adaptability to dynamic environments. It explores the leader's role as a central factor in building cohesive, high-performing, and resilient project teams. Design / Method / Approach. The study employs comparative analysis, typology of leadership styles, interdisciplinary literature review, and logical-analytical synthesis. It draws on concepts from contemporary management, organizational behavior, and human resource leadership. Findings. The research identifies transformational, coaching, servant, and distributed leadership as the most effective approaches for fostering employee engagement, creativity, responsibility, and responsiveness. It outlines key factors influencing leadership model selection, including project type, team structure, and implementation phase. Theoretical Implications. The article expands the conceptual understanding of modern leadership in project management, emphasizing the shift in leadership paradigms and the importance of emotional intelligence. Practical Implications. The research offers practical recommendations for selecting leadership styles according to project-specific contexts, which may benefit project managers, consultants, and educators. Originality / Value. The article integrates multiple leadership models into the project management framework, allowing for a strategically flexible approach to team leadership. Research Limitations / Future Research. The study focuses on transformational, servant…
subject: Project Management and Leadership
  topic: section
subject: Organizational Behavior and Human Resource Management
  topic: category
subject: Strategy and Management
  topic: category
subject: flexible leadership
  topic: keywords
subject: project management
  topic: keywords
subject: team collaboration
  topic: keywords
subject: emotional intelligence
  topic: keywords
subject: transformational leadership
  topic: keywords
subject: servant leadership
  topic: keywords
creator: Sofia Savelieva
creator: Yuliia Stasiuk
rights: Copyright (c) 2025 Sofia Savelieva, Yuliia Stasiuk (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 109
ending page: 114
doi: 10.15421/cims.4.310

Improvement of data flow management in the air traffic control automation system
type: item
description: Section: Control Systems, Telecommunications and Navigation Categories: Management Information Systems, Control and Systems Engineering Keywords (enter each keyword separately and confirm each by pressing Enter): data flow management, air traffic control system, information load Purpose. The research purpose is to improve the data flow management of the air traffic control system of the Danylo Halytskyi International Airport “Lviv”. Design / Method / Approach. The following methods and approaches were consistently used in the research: system approach; modeling; content analysis; statistical analysis; project approach; economic analysis. Findings. Recommendations have been developed for optimizing data flow processing, including improving technological solutions, increasing the level of automation, and implementing strategies to reduce stress on controllers. The features and effectiveness of air traffic management and the data flow network of the automated control system of the Danylo Halytskyi International Airport “Lviv” have been studied. The program has been developed to improve the effectiveness of air traffic management and the data flow network of the automated control system of the Danylo Halytskyi International Airport “Lviv”. The effectiveness of the implementation of the program to improve air traffic management and the data flow network of the automated control system of the Danylo Halytskyi International Airport “Lviv” has been substantiated. Theoretical Implications. Methodological aspects of data flow management of the automated air traffic control system network have been investigated. Practical Implications. Directions for increasing the efficiency of air traffic control and data flow management of the automated control system network of the Danylo Halytskyi International Airport “Lviv” have been developed and substantiated. Originality / Value. The implementation of the modern technical and methodological solutions proposed in the article for the a…
subject: Control Systems, Telecommunications and Navigation
  topic: section
subject: Management Information Systems
  topic: category
subject: Control and Systems Engineering
  topic: category
subject: data flow management
  topic: keywords
subject: air traffic control system
  topic: keywords
subject: information load
  topic: keywords
creator: Ganna Kalashnyk
creator: Myroslava Kalashnyk-Rybalko
creator: Artem Mykhailetskyi
rights: Copyright (c) 2025 Ганна Калашник, Мирослава Калашник-Рибалко, Артем Михайлецький (Автор) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 73
ending page: 82
doi: 10.15421/cims.4.281

Multi-criteria optimization of composite panels with rib reinforcement under combined loading
type: item
description: Section: Aerospace vehicles Categories: Aerospace Engineering, Computational Mechanics Keywords (enter each keyword separately and confirm each by pressing Enter): composite panels, stiffeners, vector optimization, integral quality criterion, human-machine procedure Purpose. The study is aimed at finding a constructive balance between the mass and cost of composite panels with stiffeners that are subjected to combined loading. The optimization was carried out taking into account real operation conditions, when a slight improvement in one of the parameters can significantly affect the efficiency of the structure. Design / Method / Approach. The work integrates engineering mechanics and mathematical modeling with the construction of a vector optimization model, for the solution of which the procedure of forming an integral quality criterion was applied, which considers expert assessment and the principle of guaranteed results. Conclusions. The proposed methodology allows not only to determine the optimal structural parameters for panels with different reinforcement options but also provides flexibility for adaptation to variable loads and constraints. The model was successfully tested on the example of six load scenarios for panels with rectangular and angular ribs. Theoretical implications. The development contributes to the development of multi-criteria optimization of composite structures, in particular by refining models and expanding the principles of evaluating the trade-off between criteria. This lays the foundation for further research in the field of aircraft design, where criteria may contradict each other. Practical implications. The results formed the basis for the creation of a software package that allows for the determination of the most appropriate options for structural reinforcement depending on the constraints and requirements. Originality / Value. The human-machine decision-making system underlying the approach allows for expert intuition to be con…
subject: Aerospace vehicles
  topic: section
subject: Aerospace Engineering
  topic: category
subject: Computational Mechanics
  topic: category
subject: composite panels
  topic: keywords
subject: stiffeners
  topic: keywords
subject: vector optimization
  topic: keywords
subject: integral quality criterion
  topic: keywords
subject: human-machine procedure
  topic: keywords
creator: Mykola Mormul
creator: Oleksandr Shchytov
creator: Dmytro Shchytov
rights: Copyright (c) 2025 Mykola Mormul, Oleksandr Shchytov, Dmytro Shchytov (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 29
ending page: 35
doi: 10.15421/cims.4.278

Optimizing Material and Technology Selection for Cost-Effective Equipment Performance
type: item
description: Section: Structural and Functional Materials Categories: Industrial and Manufacturing Engineering, Metals and Alloys Keywords (enter each keyword separately and confirm each by pressing Enter): high-manganese steel, austenite, martensitic transformation, wear resistance, plastic deformation Purpose. To optimize criteria for evaluating the implementation of wear-resistant materials to reduce production costs and equipment downtime. Design / Method / Approach. The study employed an analytical review of publications, spectral and metallographic analysis of alloys, a gravimetric method for assessing wear resistance, and heat treatment to enhance it. Findings. An analysis of challenges in developing materials for mining, metallurgical, and construction equipment was conducted. It was established that component service life must align with equipment maintenance schedules. New materials with enhanced wear resistance may be economically unviable due to high costs or inability to realize durability benefits. A balance between cost and service life is achieved by analyzing operating conditions and defining material and technology requirements. Theoretical Implications. The study expands knowledge on reducing production costs by identifying criteria for the effective implementation of materials and technologies. Practical Implications. A multi-criteria analysis is proposed for adopting new materials and technologies in the production of components for mining, metallurgical, and construction equipment, reducing costs and downtime. Originality / Value. The methodology uniquely optimizes material selection by aligning component durability with maintenance schedules, minimizing downtime. Its innovative alloy development resolves conflicting material requirements, enhancing production efficiency. Research Limitations / Future Research. Limitations include a focus on specific materials; future research should explore a broader range of materials and conditions. Article Type. Empiric…
subject: Structural and Functional Materials
  topic: section
subject: Industrial and Manufacturing Engineering
  topic: category
subject: Metals and Alloys
  topic: category
subject: high-manganese steel
  topic: keywords
subject: austenite
  topic: keywords
subject: martensitic transformation
  topic: keywords
subject: wear resistance
  topic: keywords
subject: plastic deformation
  topic: keywords
creator: Valerii Netrebko
creator: Vadym Shalomieiev
creator: Serhii Sheiko
creator: Olexandr Shapurov
creator: Oleksii Hrechanyi
creator: Valentyna Tretiak
rights: Copyright (c) 2025 Valerii Netrebko, Vadym Shalomieiev, Serhii Sheiko, Olexandr Shapurov, Oleksii Hrechanyi, Valentyna Tretiak (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 61
ending page: 68
doi: 10.15421/cims.4.287

Transfer Function of a Time-Varying Control System Considering Actuator Inertia
type: item
description: Section: Control Systems, Telecommunications and Navigation Categories: Aerospace Engineering, Control and Systems Engineering Keywords (enter each keyword separately and confirm each by pressing Enter): time-varying control system, transfer function, equivalence criterion Purpose. Methodological support for building an algorithm for determining the transfer function (TF) of a link, which, considering the actuator dynamics and the disturbed motion of the mass center, is equivalent on a selected trajectory section to a time-varying control system (TCS) for the rocket movement in one plane. Design / Method / Approach. TCS is modeled using differential equations with changing coefficients. To define the type of TF, the Laplace transformation of the equations is performed, while its coefficients are determined by finding the equivalence criterion extreme of the output signals of the TCS and the link under the action of the test signal. Findings. The example of the TCS for the rocket movement in the yaw plane shows the possibility of an algorithm constructing for studying its dynamic characteristics by using the mathematical apparatus of linear stationary systems. Theoretical Implications. Finding the extreme of the equivalence criterion of the TCS and the link using the Levenberg-Marquardt method, with the coordinates of the extreme point being the arguments of the TF coefficients. Practical Implications. Using the TF of equivalent link, it is possible to obtain for the selected trajectory section a quantitative estimate of the stability margin, the duration of the transient process, the accuracy of disturbance compensation, and the transmission coefficient depending on the signal frequency input. The obtained results contribute to the methodological base expansion for linear time-varying systems research. Originality / Value. Analytical solution of the link differential equation for a test signal in the form of a sequence of rectangular and parabolic pulses using the L…
subject: Control Systems, Telecommunications and Navigation
  topic: section
subject: Aerospace Engineering
  topic: category
subject: Control and Systems Engineering
  topic: category
subject: time-varying control system
  topic: keywords
subject: transfer function
  topic: keywords
subject: equivalence criterion
  topic: keywords
creator: Volt Avdieiev
rights: Copyright (c) 2025 Volt Avdieiev (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 83
ending page: 88
doi: 10.15421/cims.4.280

Open-source analysis of the potential configuration and kinetic performance of the Oreshnik ballistic missile
type: item
description: Section: Aerospace vehicles Categories: Aerospace Engineering, Mechanical Engineering Keywords (enter each keyword separately and confirm each by pressing Enter): Oreshnik system, kinetic warhead, suborbital trajectory, aerodynamic heating, propulsion configuration, ballistic missile Purpose. This article presents an analysis of the tactical and technical characteristics of the Oreshnik medium-range ballistic missile, which, according to open-source data, was employed in a precision strike against an infrastructure facility in Dnipro in November 2024. The study focuses on the missile’s configuration, warhead type, and aerodynamic behavior using open-source information. Design / Method / Approach. An interdisciplinary methodology was applied, comprising Sentinel-2 satellite imagery analysis, kinetic-energy and aerodynamic-heating modeling, and comparative assessment against the Russian Avangard, Rubezh, and UR-100N UTTKh platforms. Missile debris and factory markings were used to reconstruct manufacturing chronology and identify design features. Findings. It was determined that Oreshnik is equipped with a hypersonic non-explosive kinetic warhead capable of destructive impact via high-velocity collision. The missile likely follows a suborbital trajectory, achieving speeds of 11–12 km/s and surface temperatures in excess of 4300 K. Markings indicate key components were manufactured in 2017, suggesting reuse of legacy platforms. Theoretical Implications. This work advances the theory of kinetic-impact systems by elucidating thermal-loading mechanisms and energy-transfer processes in hypersonic vehicles, thereby bridging contemporary implementations with the historical “Rods from God” concept. Practical Implications. The findings reveal limited strike effectiveness owing to high costs and moderate destructive yield, yet underscore the system’s value as a demonstrator technology and its utility for hypersonic-system testing. Originality / Value. This study constitutes the…
subject: Aerospace vehicles
  topic: section
subject: Aerospace Engineering
  topic: category
subject: Mechanical Engineering
  topic: category
subject: Oreshnik system
  topic: keywords
subject: kinetic warhead
  topic: keywords
subject: suborbital trajectory
  topic: keywords
subject: aerodynamic heating
  topic: keywords
subject: propulsion configuration
  topic: keywords
subject: ballistic missile
  topic: keywords
creator: Mykola Bondarenko
creator: Volodymyr Habrinets
creator: Mykhailo Vorobei
rights: Copyright (c) 2025 Mykola Bondarenko, Volodymyr Habrinets, Mykhailo Vorobei (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 36
ending page: 42
doi: 10.15421/cims.4.306

Integration of Emotional Intelligence and Neuropsychological Approaches into Educational Crisis Management
type: item
description: Section: Project Management and Leadership Categories: Organizational Behavior and Human Resource Management, Strategy and Management Keywords (enter each keyword separately and confirm each by pressing Enter): emotional intelligence, crisis management, education, neuropractices, psychological support, emotional self-regulation Purpose. Theoretical substantiation and practical modeling of the integration of psychological resources of emotional intelligence and neuro-approaches into the crisis management system in education. The focus is on identifying effective tools to support participants in the educational process under conditions of social instability, war, emotional exhaustion, and professional burnout. Design / Method / Approach. Interdisciplinary study combining psychological analysis, conceptual modeling, systemic educational management, teacher surveys, and systemic intervention modeling. Findings. The research substantiates integrating emotional intelligence (for psycho-emotional stability) and neuropractices (for internal resource activation) into educational crisis management. A proposed model integrates cognitive-emotional regulation, body-oriented techniques, and reflective practice for a safe educational environment. Theoretical contribution. Clarifies educational crisis management framework, expands emotional intelligence use as systemic psycho-pedagogical support, and reveals neuropsychological practices' potential in regulating educator stress responses. Practical implications. Results applicable for educational managers, tutors, and teacher professional development. Tools help reduce emotional burnout, increase stress resilience, and enhance crisis decision-making. Originality / Value. Innovative integration of psychological and neuropsychological tools into educational management. Uniquely presents emotional intelligence as a strategic resource for educational management under crisis. Research limitations / Future research. Applied study, limited…
subject: Project Management and Leadership
  topic: section
subject: Organizational Behavior and Human Resource Management
  topic: category
subject: Strategy and Management
  topic: category
subject: emotional intelligence
  topic: keywords
subject: crisis management
  topic: keywords
subject: education
  topic: keywords
subject: neuropractices
  topic: keywords
subject: psychological support
  topic: keywords
subject: emotional self-regulation
  topic: keywords
creator: Yuliia Starova
rights: Copyright (c) 2025 Yuliia Starova (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 115
ending page: 121
doi: 10.15421/cims.4.302

Elasticity-Driven Fare Optimization in U.S. Air Travel Segments
type: item
description: Section: Market Synergy Categories: Management Science and Operations Research, Economics and Econometrics Keywords (enter each keyword separately and confirm each by pressing Enter): demand elasticity, market segmentation, distance-based pricing, revenue management, dynamic pricing, U.S. air travel market Purpose. This study investigates the variation in price elasticity of demand across U.S. domestic air travel markets, with a particular focus on how different distance-based market segments respond to airfare changes. Design / Method / Approach. The analysis presents air travel markets in the distance categories of very short, short-haul, medium-haul, and long-haul to analyze the heterogeneous nature of price responses. Findings. The results indicate substantial differences in elasticity across directions. In the short-haul markets, the negative price elasticity demonstrates strong awareness of fare increases (ε=-0.344). Conversely, long-haul markets demonstrate price elasticity in a positive direction (ε = +1.840), indicating perceptions of value-added (i.e., direct services quality or even network effects). Medium-haul distances suggest nearly neutral responses, and the very short routes produce statistically insignificant elasticity coefficients. Theoretical Implications. The research expands transportation economics and marketing analytics literature through the analytic demonstration that distance travelled does impact demand elasticity in the case of airline routes. The study provides additional evidence for segmentation theories and distance-based price models. Practical Implications. The results provide airline revenue managers with data-based evidence that depicts the opportunity to develop fare structures that align closer to consumer behaviors and may provide opportunities for enhanced profits by utilizing distance and type of flight configurations. Originality / Value. This study employs an entirely unique segmentation-based approach to enable an elast…
subject: Market Synergy
  topic: section
subject: Management Science and Operations Research
  topic: category
subject: Economics and Econometrics
  topic: category
subject: demand elasticity
  topic: keywords
subject: market segmentation
  topic: keywords
subject: distance-based pricing
  topic: keywords
subject: revenue management
  topic: keywords
subject: dynamic pricing
  topic: keywords
subject: U.S. air travel market
  topic: keywords
creator: Annur Islam Sifat
creator: Md Adnan Elahi
rights: Copyright (c) 2025 Annur Islam Sifat, Md Adnan Elahi (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 133
ending page: 138
doi: 10.15421/cims.4.316

Statistical Analysis and Forecasting of Injury-Related Road Accidents in Dnipropetrovsk Region
type: item
description: Section: Ecology, industrial and environmental safety Categories: Statistics, Probability and Uncertainty, Safety, Risk, Reliability and Quality Keywords (enter each keyword separately and confirm each by pressing Enter): road traffic accidents, road safety, analysis of variance, forecasting, , temporal factors, seasonality , correlation and regression analysis Purpose. The study aims to identify seasonal and weather-related factors influencing the number of road traffic accidents (RTAs) with casualties in Dnipropetrovsk Oblast, in order to provide a basis for short-term accident forecasting and improve the effectiveness of traffic safety prevention measures. Design / Method / Approach. The study is based on monthly statistical data from 2020 to 2025, sourced from the Patrol Police of Ukraine and the Main Department of Statistics in Dnipropetrovsk Oblast. The analysis integrates boxplot visualization, one- and two-way ANOVA, correlation analysis, and multiple regression analysis, accounting for temperature, precipitation, humidity, wind speed, and calendar month. Findings. A statistically significant impact of the calendar month was confirmed as the main seasonal factor. The regression model showed a clear link between RTAs and combined weather and calendar variables. Accident rates peaked in summer–autumn and dropped in winter–spring, with February showing the least variation. Monthly factors proved useful for short-term forecasting. Time series analysis enabled tracking trends (2020–2024) and projecting them through 2026. Theoretical Implications. The results enhance the understanding of the interplay between seasonal, calendar, and weather-related factors and accident rates within a regional context. Practical Implications. The findings can be used by local authorities, police, and road safety services to plan preventive measures during periods of increased accident risk. Originality / Value. A comprehensive approach is proposed for analyzing RTAs at the regional…
subject: Ecology, industrial and environmental safety
  topic: section
subject: Statistics, Probability and Uncertainty
  topic: category
subject: Safety, Risk, Reliability and Quality
  topic: category
subject: road traffic accidents
  topic: keywords
subject: road safety
  topic: keywords
subject: analysis of variance
  topic: keywords
subject: forecasting,
  topic: keywords
subject: temporal factors
  topic: keywords
subject: seasonality
  topic: keywords
subject: correlation and regression analysis
  topic: keywords
creator: Tetiana Rusakova
rights: Copyright (c) 2025 Tetiana Rusakova (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 152
ending page: 157
doi: 10.15421/cims.4.311

Optimization Problem of the Launch Vehicle Pitch Angle during Spacecraft Insertion into Circular Orbits
type: item
description: Section: Control Systems, Telecommunications and Navigation Categories: Aerospace Engineering, Control and Systems Engineering Keywords (enter each keyword separately and confirm each by pressing Enter): launch vehicle dynamics, spacecraft circular orbit insertion, mathematical model, pitch angle program, orbital trajectory optimization Purpose. The aim of the study is to formulate and analytically pose the task of constructing the pitch program of a launch vehicle, ensuring the insertion of a spacecraft into a circular orbit, considering constraints on the motion parameters and requirements for the final state. Design / Method / Approach. An analytical model for the pitch program is proposed, consisting of five phases: vertical ascent, angular acceleration, constant angular velocity motion, deceleration, and a final fixed-angle phase. Dimensionless coefficients are introduced to characterize the relative durations of active angular maneuver phases. Findings. Analytical expressions were derived for the pitch angle, angular velocity, and acceleration for each control phase, ensuring continuity and physical realizability. Expressions for the resulting orbital altitude and control effort provide a basis for multi-criteria optimization. Theoretical Implications. The developed formalization enables analytical optimization of the pitch program without a full vehicle motion model, aiding understanding of the link between control structure and orbital injection conditions. Practical Implications. The proposed model can be used in preliminary design stages for initial synthesis of the launch vehicle pitch program, enabling rapid assessment of trajectory controllability and compliance with specified orbital parameters, avoiding full-scale simulation. Originality / Value. Unlike approaches based on full numerical integration, this study presents a simplified, analytically manageable pitch program model, allowing efficient optimization considering physical constraints and final…
subject: Control Systems, Telecommunications and Navigation
  topic: section
subject: Aerospace Engineering
  topic: category
subject: Control and Systems Engineering
  topic: category
subject: launch vehicle dynamics
  topic: keywords
subject: spacecraft circular orbit insertion
  topic: keywords
subject: mathematical model
  topic: keywords
subject: pitch angle program
  topic: keywords
subject: orbital trajectory optimization
  topic: keywords
creator: Ruslan Keba
creator: Anatolii Kulabukhov
rights: Copyright (c) 2025 Руслан Кеба, Анатолій Кулабухов (Автор) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 89
ending page: 93
doi: 10.15421/cims.4.289

On the modification of direct methods for solving optimal control problems of stationary thermal processes
type: item
description: Section: Control Systems, Telecommunications and Navigation Categories: Computer Science Applications, Control and Systems Engineering Keywords (enter each keyword separately and confirm each by pressing Enter): stationary thermal process, control, system state, objective functional, gradient method, modified algorithm, efficiency Purpose. The aim of the study is to apply modified gradient-type methods to problems of optimal control of one-dimensional stationary thermal processes and to conduct a comparative analysis of the effectiveness of the classical and modified approaches using the example of solving specific problems. Design / Method / Approach. The research is focused on the development and numerical implementation of approximation-iteration algorithms based on the grid method for the analysis of controlled thermostatic systems modeled by differential equations with variable coefficients. For the numerical solution of the primary and adjoint boundary value problems, second-order accuracy difference schemes are used. To find the lower boundary of the objective functional, gradient-type minimization methods are used, both with and without control constraints. Findings. The proposed modified computational schemes demonstrate an increase in the efficiency of the classical grid method in terms of the amount of required computational costs and the accuracy of the obtained approximate solutions. Theoretical Implications. Expanding the possibilities of applying theoretically substantiated direct methods of accelerated convergence to solving optimal control problems of stationary thermal processes. Practical Implications. Creating an effective computational tool for solving optimal control problems of stationary thermal processes, which can be applied in practice. Originality / Value. Implementation of new computational schemes of accelerated convergence of modified gradient-type methods for the specified class of optimal control problems. Research Limitations / Futu…
subject: Control Systems, Telecommunications and Navigation
  topic: section
subject: Computer Science Applications
  topic: category
subject: Control and Systems Engineering
  topic: category
subject: stationary thermal process
  topic: keywords
subject: control
  topic: keywords
subject: system state
  topic: keywords
subject: objective functional
  topic: keywords
subject: gradient method
  topic: keywords
subject: modified algorithm
  topic: keywords
subject: efficiency
  topic: keywords
creator: Liudmyla Hart
creator: Anna Buhaienko
rights: Copyright (c) 2025 Liudmyla Hart, Anna Buhaienko (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-06-24
publication date: 2025-06-24
starting page: 94
ending page: 100
doi: 10.15421/cims.4.314