VGTU Journals (Vilnius Gediminas Technical University - Vilnius Tech)
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A dual hesitation fuzzy VIKOR method with incomplete attribute weights for property service quality evaluation
No full textThe evaluation of property service quality is a typical multi-index evaluation problem, which has the characteristics of comprehensiveness and incomplete information in the modern service industry environment. To solve the above problem, we propose a dual hesitation fuzzy VIKOR comprehensive decision method based on incomplete attribute weights for evaluating property service quality. The method integrates innovative distance measurement, comprehensive weighting, and VIKOR decision technology to address challenges such as incomplete information, unknown weights, and evaluator hesitation. By incorporating the information value of dual hesitation fuzzy set hesitancy, we have designed a new distance measurement formula and developed a comprehensive weighting method that combines subjective and objective data. The dual hesitation fuzzy VIKOR model utilizes these tools to calculate utility values and regret values in order to make scientifically grounded decisions. This approach provides robust support for enhancing property service quality and demonstrates broad potential applications in fuzzy information processing and other domains
Exploring justice perceptions in online banking recovery: gender moderation and behavioral outcomes
No full textThe study addresses the recovery from service failures in online banking. It focuses on the three dimensions of perceived recovery justice – namely, distributive justice (DJ), procedural justice (PJ), and interactional justice (IJ) – and investigates their impact on post-recovery satisfaction (PRS), the moderating effect of gender, and further, the influences of PRS on customer trust (CT), affective commitment (AFFC), and customers’ behavioral intentions (CBI). The study uses partial least squares structural equation modelling to examine the data collected in Egypt from 445 respondents who experienced a service failure with online banking. The results show that the three dimensions of perceived recovery justice – DJ, PJ, IJ – exert positive influences on PRS, and gender moderates the effects of PJ and IJ on PRS: procedural justice makes women exhibit higher levels of PRS. In contrast, interactional justice makes men encounter higher levels of PRS. The results also show that PRS positively influences CBI through its direct and indirect effects (via CT and AFFC). Furthermore, PRS mediates the positive effects of DJ, PJ, and IJ on customers’ behavioral intentions. The study outcomes have significant theoretical and practical implications for online banking
Multifractal analysis of Bitcoin price dynamics
No full textThis research employs Multifractal Detrended Fluctuation Analysis (MFDFA) to investigate multifractal properties in financial variables, including Bitcoin prices and economic indicators. Spanning 2019–2022, the analysis reveals multifractal scaling not only in Bitcoin prices, but also in economic indicators such as inflation rates and energy commodity prices. The non-linear singularity spectra unveil the multifaceted nature of scaling properties. Temporal analysis exposes intriguing trends in multifractality with implications for market efficiency. Furthermore, correlation analysis unveils connections among multifractal properties. For instance, a positive correlation between oil prices and Bitcoin suggests similar market forces. The log-log plot of fluctuation function Fq versus lag size demonstrates a power-law relationship, characteristic of multifractal systems. The empirical data’s alignment in log-log space suggests self-similarity in the Bitcoin time series, supporting multifractality. The calculated Hurst exponents values suggest varying degrees of multifractality across the years, with 2021 exhibiting the highest degree and 2022 the lowest. Furthermore, an asymmetry index (0.5767) deviating from 0.5 indicates that the multifractal nature of the Bitcoin market is not symmetric. This research enhances risk assessment and portfolio optimization in finance. It challenges the Efficient Market Hypothesis (EMH), emphasizing the significance of MFDFA in comprehending financial market and economic factor’s relationships
Do ICT boost business-to-business satisfaction in times of uncertainty?
No full textTourism is a highly sensitive industry concerned about the social and economic consequences of instability. In this sense, it is vital to understand how relationships develop and what factors lead to satisfaction among the stakeholders. Most research on tourism has focused on analysing B2C relationships, but B2B relationships have been considerably neglected. This paper aims to test whether theoretical relationships postulated in a B2C setting are transferable to the B2B environment. A novel model is postulated to explain the factors that lead to satisfaction among tourism businesses by considering technology, customer orientation, sustainability, and brand equity as key antecedents for social and economic satisfaction in B2B relations. Data from 268 managers of Spanish hotels were collected through a survey. The results obtained through partial least squares regression show that all but one of the hypotheses proposed in the model are supported, so that technology fosters both customer orientation and sustainability. Moreover, the chain customer orientation-brand equity-sustainability-social satisfaction-economic satisfaction, and therefore, this work contributes to understanding the elements that boost economic satisfaction in the relationships between hotels and travel agencies, and provides recommendations on the efficient use of technology
Assessing small and medium-size enterprise CEOs\u27 attitude towards business growth: the impact of event risk
No full textThis research explores SME CEOs’ attitudes toward business growth during extreme global event risks, addressing the gap in understanding SME growth strategies in times of global crises. Drawing from Protection Motivation Theory, Theory of Planned Behaviour, and Resource-Based View, conceptual framework was developed to investigate how motivating factors impact SME CEOs’ attitude and commitment towards business growth intention, with company size as moderator. Data were collected through an online survey administered to 198 Turkish SME CEOs and analysed using structural equation modelling. The results demonstrate that SME CEOs’ intention is influenced by attitude toward business growth, growth commitment, and perceived event risk. Company size only moderates the relationship between event risk and business growth intention. Subjective norms positively influence the attitude toward business growth. Interestingly, there is no relationship between perceived behavioural control and attitude. This study provides better understanding of SME growth decisions during crises, offering insights for both scholars and practitioners. It highlights that practitioners should be aware that business growth decisions are influenced by perceived expectations from others, internal motivations, organisational factors, and external factors (e.g., event risk). The findings suggest that SME CEOs need to be more agile and proactive in responding to external event risk
Sustainable recovery plan for an urban-rural community affected by the Fundão Dam disaster in Brazil
No full textThe rupture of Fundão Dam spilled contaminated tailings across the Doce river basin, severely damaging municipalities such as the urban Barra Longa and the rural Gesteira. The wave of tailings led to the sediment deposition in rivers margins, causing the loss of riparian forests and cropping areas. Sediment analyses confirmed the presence of toxic compounds (sodium and ether amine) and a very low fertility. In consequence, there was a sharp decline in agro-pastoral production in Gesteira, leading to land abandonment and rural exodus. In the urban area of Barra Longa, the wave of tailings damaged the urban floodplain and the square, which were rehabilitated using grey infrastructure. Alternatively, we proposed a new landscape recovery plan for both Barra Longa and Gesteira based on Nature and Community-based solutions that contemplate the inclusion of green infrastructure, the remediation of toxic compounds, the restoration of soil fertility, permeability and stabilization, riparian forest rehabilitation and the recovery of agro-pastoral productivity, ultimately aiming at reducing the flood risk and land abandonment
Landscape management for disaster-prone cities: disaster resilient park proposal
No full textElazığ is a disaster-prone city due to its geological structure, proximity to fault lines, and similar reasons. As part of the study, a disaster-resilient green space model applicable to the city has been developed. The study examines how green spaces should be planned and designed to be used in disaster situations. The methodology of the study consists of three phases. (1) The city of Elazığ was analyzed in terms of disasters. (2) UAV and GPS CORS devices were used to collect data in the area designated as the disaster park and three-dimensional spatial analysis was performed. (3) The disaster park was designed according to the data obtained. The results show that Elazığ is frequently affected by disasters. Therefore, it is understood that the city needs a disaster-resistant green system. Suggestions for the design of disaster parks and their inclusion in the landscape management of disaster-prone cities have been developed
Human factors considerations for critical maintenance tasks and their effect on the transition to digital documentation: an exploratory expert survey
No full textDigitised maintenance documentation will soon be the norm in aviation. Failure to correctly perform maintenance tasks may lead to aviation safety hazardous events. This article explores the views of aviation maintenance subject matter experts on errors affecting critical maintenance tasks and how views can inform transition to digitised documentation. This exploratory study offers a fresh view on human factors’ implications around critical maintenance tasks and their relation to digital documentation. A cross-sectional design method was utilised. Anonymous responses were collected with a mixed-methods questionnaire from convenience sample of participants from different aircraft maintenance and continuing airworthiness management organisations. Expert opinions of 25 aircraft maintenance and technical services engineers were recorded. All participants had personal experience with maintenance errors, where human factors attributed to these errors. They highlighted the lack of human factors’ awareness and the need to strengthen their contributory role in critical maintenance tasks. Participants’ views appeared divided in terms of challenges associated with digital documentation utilisation. Positive features emerged, such as critical maintenance tasks or duplicate/independent inspections’ highlighting, notes and warnings’ higher visibility, up-to-date documentation availability and better connectivity among activities. Negative themes concentrated on the tactile nature of paper and on the additional technology knowledge requirements
Developing Alsim AL250 based eVTOL flight simulator
No full textA novel eVTOL aircraft simulator was developed for research and teaching purposes. The simulator integrated MATLAB/Simulink flight dynamics model with Alsim AL250 FNPT II flight simulator. Simplified version of the Neoptera’s eOpter eVTOL aircraft was used as a test case to verify the flight simulator. It was shown that the aircraft responded as expected by the pilot and that the traditional handling qualities metrics and VTOL requirements (MIL-F-83300, MIL-F-8785C, EASA-SC-VTOL-02) could be used along the flight simulator to assess aircraft being tested. Take-off showed an increase in climb rate as well as overshoot of the target altitude with higher RPM setting. Qualitative assessment of transition showed suitable stability and control feel for the eVTOL to be operated by a single pilot. Quantitative assessment of the longitudinal manoeuvring characteristics showed Level 2 SPPO handling qualities for the tested eVTOL aircraft, qualitative definition of which agreed with the pilot’s opinion. It was also shown that increasing initial velocity for the SPPO mode test increased the mode’s natural frequency, but almost did not affect the damping ratio, which is within the expectations
Dissipative measure-valued solutions to the magnetohydrodynamic equations
No full textIn this paper, we study the dissipative measure-valued solution to the magnetohydrodynamic equations of 3D compressible isentropic flows with the adiabatic exponent γ > 1 and prove that a dissipative measure-valued solution is the same as the standard smooth classical solution as long as the latter exists, provided they emanate from the same initial data (weak–strong) uniqueness principle