VGTU Journals (Vilnius Gediminas Technical University - Vilnius Tech)
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Calderón-Zygmund estimates for Schrödinger equations revisited
No full textWe establish a global Calderón-Zygmund estimate for a quasilinear elliptic equation with a potential. If the potential has a reverse Hölder property, then the estimate was known in [6]. In this note, we observe that the estimate remains valid when the potential is merely Lebesgue integrable. Our proof is short and elementary
A case study of the use of statistical processing of the armature rotation irregularities for the diagnostics of locomotive traction electric motors
No full textLocomotive Traction Electric Motors (TEMs) generate power to rotate the wheelsets of diesel or electric locomotives, electric or diesel multiple units. TEMs are the most critical parts of traction rolling stock on which exploitation costs, reliability and train traffic safety depend. The purpose of the article is to evaluate the possibility of diagnostics the technical condition of the TEM using the rotation irregularities of the armature shaft in the electric motor as a diagnostic parameter. The article analyses the main causes of TEM failures and methods for diagnosing electric motors in operation. The expediency of using the rotation irregularities of the armature shaft in the electric motor as a diagnostic parameter is substantiated. The structural flowchart of the device for measuring the rotation irregularities of the armature is presented. Diagnosing the mechanical part of an electric motor is chosen as an implementation example. The authors confirmed the connection between the technical condition of the electric motor and the statistical indicators calculated for the signal of the rotation irregularities of the armature shaft
How does ICT capital stock affect high-quality economic growth? Evidence from China
No full textAs an essential driving force to promote industrial upgrading and technological innovation, ICT has gradually become the technological support for high-quality economic growth. This paper adopts the improved perpetual inventory method and entropy weight TOPSIS method to measure China’s ICT capital stock and economic high-quality growth index, respectively, and experimentally examines the effect of the former on the latter. The findings show that the south has a more extensive ICT capital stock than the north, and the coastal region has a better high-quality growth index than the inland region. Meanwhile, high-quality economic growth, which has increased since 2009 and is incredibly robust in the south, positively correlates with ICT capital stock. Further research finds that ICT capital stock can boost high-quality economic growth by raising marketization and human capital. The results provide policy recommendations for enhancing high-quality economic growth.
First published online 19 November 202
Creativity and disinformation in artificial intelligence-driven fashion communication
No full textFashion is an industry of constant changes and reflects societal alterations; therefore, fashion brands must always seek creative and innovative communication strategies for a positive brand reputation and be at the forefront of technology. Fashion communication shapes society’s needs and perceptions of reality, which are currently shifting due to the high density of various artificial intelligence technologies, including those that can recreate reality. Therefore, consumers are easy to deceive, and creative ways of communicating using artificial intelligence lead to creative ways of disinformation. The question arises as to which topics of creative use of artificial intelligence in the field of the fashion industry are the most widely studied and what the research gaps are. An integrative literature review focusing on papers published between January, 2016 and January, 2024 was conducted to answer the research question and clarify the tendencies of future research. The findings of this research show the emerging machine-washing concept as the topics that scholars are mostly focused on – the recreation of reality using deepfakes and altered images, digital influencers, and their messages
Possibilities for evaluation to foster the soft skills of critical thinking, creativity, and communication in higher education
No full textSoft skills are the foundation of a solid and consistent lifelong education in a changing world. Students’ self-reported achievement motivation is a good indicator of their level of self-awareness. A rigorous assessment of the process’ results is necessary for an effective soft skill education program. There are significant flaws in the way the university’s curriculum handles soft skill assessments. Therefore, the question is: given the resources at hand, how can one properly ascertain which soft skills requirements change the most over a university education? To identify changes at the start and finish of studies and prepare instruction for soft skill suggestions during university studies, this study intends to measure the differences in self-assessment indicators of students’ creativity, critical thinking, and communicative abilities in university settings. The purpose of this study is to verify a variety of tools for assessing students’ soft skills and figure out how effectively they can recognize variations throughout multiple university study stages. This could aid in the preparation of recommendations for soft skill instruction in courses, which could be beneficial for university graduates’ future employment. Among first- and last-year university students, a self-assessment study on soft skills was conducted. The results show that students’ soft skills are not equally impacted by their university education. The critical thinking abilities of first- and fourth-year students only tend to improve but do not differ reliably
Creativity of formal analysis in the study of ballroom dancing choreography
No full textThe article presents a structural analysis of the dynamics of position development in a pair in ballroom dancing with the use of research tools based on the method of formal analysis by Alexander Georgievich Gabrichevsky and the analysis of body movement in space by Rudolf von Laban. The aim of the study is to identify the distinctive features of the evolution of form in ballroom dancing. On the basis of formal analysis, the objectives of the research were to study ballroom dancing in spatial and temporal terms, to structure the dance form in vertical and horizontal planes, in the correlation of the categories of rhythm and meter, as well as in the context of static and dynamic time. The result of this study is a synthesis of the categories of space and time, which showed the leading trends in the development of the aesthetics of modern standard dances in the periods of modernism, postmodernism, and metamodernism. The comparative method made it possible to identify the characteristic features of the dynamics of form development in modern standard dances of the aforementioned periods. The uniqueness of the performing style in the categories of space, time, and their synthesis are revealed and analyzed. Illustrative examples of the study of the position of couples in the vertical and horizontal planes using the figure icosahedron are presented. The study also presents a conceptual map of the development of ballroom dancing in the context of the modern, postmodern, and metamodern eras. The main provisions of the study are the unity of spatial and temporal chronotope in ballroom dancing, considered as spatial and temporal parameters of expression of cultural and artistic meanings of modernity, postmodernity, and metamodernity, as well as the subordination of artistic time to rhythmic logic, based on metric alternations and movements, ordering the overall composition in the artistic space of ballroom dancing. This study provides a promising toolkit for analyzing the development and dynamics of forms in broad application in the fields of dancesport and choreographic art forms. It will also help to identify choreographic art in the cultural metamodern landscape
Optimizing airway network efficiency with the A-star algorithm: a case study of Ho Chi Minh FIR
No full textAirway network optimization is crucial for airspace planning, addressing high traffic density and alleviating pressure on Air Traffic Controllers. With the rapid growth of civil aviation, overloaded airways and congestion have become significant challenges. Vietnam’s air transport sector plays a vital role in economic and social development, enhancing connectivity across the Asia-Pacific region. Additionally, Vietnam has led the global recovery of domestic aviation post-COVID-19 and, as the world’s fifth fastest-growing aviation market, is expected to reach 150 million air transport passengers by 2035. This highlights Vietnam’s dynamic growth and strategic importance within global aviation. However, this rapid expansion has exposed vulnerabilities in Vietnam’s airways, particularly within the Ho Chi Minh Flight Information Region (HCM FIR), where congestion and overload are evident, especially during adverse weather. To address these challenges, this study proposes optimizing the airway network in 2D space using the A-star algorithm, tailored for the HCM FIR. This approach aims to reduce flight distances, improve operational efficiency, and ease ATC workloads, marking a critical step toward enhancing Vietnam’s airspace management system
The influence of external economic policy fluctuation on enterprise productivity: Based on Chinese listed enterprises
No full textDrawing upon a comprehensive dataset encompassing Chinese publicly traded enterprises across the two-decade span from 2000 to 2020, this article analyzes the effects of external economic policy variations on the productivity of Chinese enterprises. The consequences show that when facing the aggravation of external variations in economic policy, enterprises prefer to enhance total factor productivity and labor productivity to reduce the risk caused by the expansion of external uncertainty. Moreover, the greater the degree of internationalization of an enterprise, the higher its vulnerability to variations in external economic policies. The mechanism test shows that for enterprises that only participate in domestic circulation, external economic policy fluctuations improve productivity by affecting the operating environment; however, when enterprises join in the dual circulation, the fluctuations will promote productivity by affecting the scale of enterprises’ overseas business instead.
First published online 6 November 202
Financial inclusion in the digital era: a key driver for reducing income inequality
No full textGrowing income inequality remains a pressing phenomenon in many developing economies, especially Sub-Saharan Africa (SSA), and may cause discontent in achieving inclusive growth which is crucial for sustainable development. Economies turning to financial inclusion as a critical component of economic development where access to formal financial institutions and services remains limited in the region. Digital technology has the potential to advance financial inclusion by tapping technology to extend financial access to underserved populations, as lack of access to efficient financial products and services can perpetuate income disparities. We employ a generalized quantile regression with an instrumental variables framework to investigate the distributional effects of financial inclusion and digitalization on income inequality in the region. Results imply that the use and adoption of the internet and mobile phones contribute to reducing income inequality, highlighting the transformative potential of digitalization across different quantiles. The findings indicate that public expenditure favors distributional impacts on inequality across quantiles. Our study suggests that policymakers in the region should prioritize the adoption and use of digital technology and foster an enabling policy that encourages the development of digital infrastructure and financial services to ensure widespread access and benefits for all segments of the population.
First published online 18 February 202
Earnings management among industries: between the old and new economies
No full textThis paper investigates sectoral prevalence and patterns of accrual-based earnings management in public companies listed on the Warsaw Stock Exchange. This research introduces a novel perspective by analysing differences in discretionary accruals proxies among industries, with particular emphasis on statistical variation of the earnings management through accruals in the old and new economies companies. Moreover, this paper fills a research gap in the literature regarding a shortfall of broader analyses on the industry-specific attributes explaining earnings management behaviours.Our findings confirmed that the extent of accrual-based earnings management in public companies varies significantly depending on the industry in which they operate. We demonstrated that companies from the new economy industries and those operating in less concentrated markets engaged in accrual-based earnings management practices more than others. On the other hand, we did not find a statistically significant relationship between the accounting-type earnings management and company-specific product market power from the perspective of the pooled sample and subsamples characterized by the specific directions of earnings games