EsACT - Publicações em Proceedings Indexadas à WoS/Scopus
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- Particle Movement on a Rotating SpherePublication . Balsa, Carlos; Otero-Espinar, M. Victoria; Gama, SílvioVortex point models are a powerful tool for addressing fundamental dynamics questions related to atmospheric and oceanic flows. This study focuses on the dynamics of a passive particle in a flow induced by two vortex points on the surface of a rotating sphere. The optimal control problem is converted into a nonlinear optimization problem and is solved numerically using a direct approach. The proposed method calculates a quasi-optimal solution, which minimizes the energy generated during the displacement. In general, this energy decreases with the increase in the number of controls. The quasi-optimal solution also depends on the rotation speed of the sphere. If the rotation speed is very high, the particle rotates several times around the sphere before reaching the destination point.
- An Approach to Environmental Cleanup Through Conceptual Autonomous TechnologyPublication . Balsa, Carlos; Victoria Otero-Espinar; Sílvio GamaThis work presents a mathematical toy model for a process of garbage collection encompassing the coordination of a vast array of autonomous devices, where each device needs only a few trajectory adjustments. This simplified conceptual model serves as a valuable tool for both educational and initial research purposes. In this model, each autonomous device is represented by a passive particle, while the environmental currents are depicted by the dynamic behavior of point vortices on a spherical surface. In order to maintain device autonomy, a system of piecewise constant controls is utilized, which involves a limited set of predetermined switching points to adjust the trajectory. Each control incurs an energy expense, and the model aims to minimize this cost by solving a nonlinear optimization problem. The preliminary findings suggest the presence of multiple potential trajectories for autonomous devices, each associated with different energy costs.
- Reassessing Master's Program Dropouts in Tourism: Is the labor market failing to compensate for the effort?Publication . Fernandes, Joana M.S.R.; Esteves, Salete;Each year, more students are enrolling in postgraduate degree pro-grams. However, many students will fail to complete the degree and drop out. Dropout results in economic and psychological repercussions and potentially hin-ders career advancement. Despite increasing enrolment in postgraduate pro-grams, existing studies predominantly focus on the undergraduate level. Still, master's students, assumed to possess maturity and experience, exhibit lower completion rates. This study focuses on master's students in tourism, a critical sector for countries reliant on skilled professionals. The research aims to eluci-date the factors influencing dropout decisions and students' perceptions regarding the economic implications. Findings suggest that motivation for pursuing a mas-ter's degree in tourism is often driven more by personal satisfaction than purely financial considerations. Furthermore, these graduates may not receive the ex-pected recognition for their advanced qualifications upon entering the labour market. As such, comprehensive analysis in tourism education is imperative to address dropout issues effectively and better align educational outcomes with job market demands.
- Unlocking the Untapped Potential of Digital Tools for Promoting Low-Density Territories: A Case Study of MirandelaPublication . Cunha, Manuela; Correia, Ricardo; Carvalho, Aida; Cunha, Carlos R.; Fontes, RutaDigital media have revolutionized promotional access, offering a universally accessible platform for dissemination. However, this study highlights a disparity in digital awareness and potential utilization between low-density and urban destinations. Using a case study, the research examines a specific low-density territory in northeastern Portugal and reveals that, despite certain efforts, the destination has not fully harnessed the resources offered by digital media. This raises concerns about its competitiveness compared to other destinations. In light of these findings, it is imperative to consider actions aimed at optimizing the potential of digital communication tools. By doing so, low-density territories can enhance their visibility, attractiveness, and competitiveness in the tourism landscape.
- Effect of the Accounting Standard Adopted on the Quality of Financial Information of Companies in the Restaurant SectorPublication . Monteiro, Zuleica; Fernandes, Ana; Alves, Jorge; Martins, Catarina AntóniaO presente trabalho tem como principal objetivo aferir se o nível do referencial contabilístico adotado pelas empresas do setor da restauração e similares influencia a sua qualidade da informação financeira. Para o efeito, classificam-se as empresas com informação disponível na base de dados Sistema de Análise de Balanços Ibéricos com o nível de referencial contabilístico que estão obrigadas a adotar, face aos critérios definidos pelo Sistema de Normalização Contabilística. A qualidade da informação financeira é aferida de acordo com o modelo de [1]. Os resultados empíricos mostram que existe uma relação positiva e estatisticamente significativa entre a qualidade da informação financeira e o nível de referencial contabilístico adotado, o que vai ao encontro da hipótese de investigação formulada e permite concluir que quanto maior o nível de referencial contabilístico adotado pela empresa maior é a sua qualidade da informação financeira.
- Visitors’ Space–Time Behaviour at Parque Biológico De VinhaisPublication . Rodrigues, Isabel; Martins, Márcio Ribeiro; Esteves, Elsa Tavares;This research mainly aims to analyse the space–time behaviour of visitors to the Parque Biológico de Vinhais (PBV) in Portugal. The Park is an ecotourism destination in the Montesinho protected area, where environmental education and respect for nature are practised. Data was collected by tracking visitors using a smartphone app with GPS (Global Positioning System) technology. It was concluded that, on average, the duration of the visits was approximately 1 h and 10 min and that, during this time, the visitors were in motion for an average of 20.5 min and stationary for an average of 53.3 min. The average distance covered was 1209 m. As for the movements made by the visitors tracked, there was a greater concentration of visitors on the park’s central walkway. As they move away from the central walkway, the density of movements decreases. Understanding the space–time behaviour of visitors is fundamental for the intelligent management of attractions and tourist destinations, allowing us to develop market strategies that are more suited to demand. Several managerial and methodological contributions are presented in the conclusions.
- Residents’ perception of tourism development: a perspective from a low-density territoryPublication . Martins, Márcio Ribeiro; Martins, Catarina Antónia; Alves, JorgeThis study explores residents' perceptions of tourism development in the Mirandela municipality, Portugal. The research aims to understand tourism's socio-cultural and economic impacts from the residents' perspective, considering both positive and negative effects. The study employs a quantitative approach through the survey of 358 residents. Findings reveal that younger residents (<30) have a more positive perception of tourism's impacts, and those with undergraduate studies have less favourable perceptions. Rural residents have more positive perceptions than urban residents, and there is no significant difference in perceptions between those involved in tourist activities and those not involved. Residents who view tourism as beneficial showed higher mean scores across several items than those who view tourism as harmful or neutral. No significant differences were found regarding the increase in the cost of living. This research highlights the importance of involving local communities in tourism planning and development to ensure balanced and sustainable growth. The conclusions present several practical and managerial implications and provide actionable recommendations for policymakers and professionals in tourism, sustainable development, and community planning.
- An Architecture for Monitoring Elderly Using Digital Image Processing and Artificial IntelligencePublication . Cunha, Carlos R.; Moreira, André; Fernandes, Joana M.S.R.The world population, on average, has seen its life expectancy increase. This phenomenon is causing the elderly population to grow. This reality has put pressure on the development of solutions - across a multidisciplinary spectrum - that are capable of helping the elderly in their daily lives. This assistance is especially important for elderly people who live alone and isolated - a common reality in many rural areas where there is a low population density. This work presents an architecture based on the use of digital image acquisition and processing associated with using Artificial Intelligence. This way, we can create solutions with easy deployment that do not disrupt the elderly’s normal day-to-day life and ensure that third parties accompany them. Even though the proposed architecture can be complemented with sensory aspects linked to the elderly person themselves, this component, as it is independent and easily incorporated, was not the object of study.
- Unlocking european funds to boost rural tourismPublication . Fernandes, Joana M.S.R.; Nogueira, Sónia P.The difficulty in attracting tourists to less-explored regions, such as rural areas, stems from many factors, including limited infrastructure, sparse amenities, a lack of visibility in the tourism industry, and limited accessibility discouraging potential visitors. Despite offering natural beauty, cultural richness, and unique expe riences, urban and coastal destinations often overshadow rural regions. Additionally, the lack of modern amenities and accommodations deters tourists who prioritise convenience and comfort. Regional entities must collaborate on effective strategies and targeted promotional campaigns to overcome these barriers. Highlighting unique aspects such as pristine landscapes, cultural festivals, and historical landmarks can reshape perceptions of rural travel. Leveraging digital platforms and social media can broaden the audience and attract more visitors. This paper proposes developing an online platform to structure tourism products in the cross-border regions of Northern Portugal and Castile and Leo´n in Spain. These regions share common challenges and advantages, and cooperation can enhance sustainable and ecological tourism. The platform will provide comprehensive tourist information about available resources, stimulate visitor interest, and encourage more extended stays, thereby boosting the local economy. The project aims to create a structured and appealing tourism offer by fostering synergies between the resources of both regions.
- Synergies for cross-border tourism: a collaborative proposal for rural revitalization in Northern Portugal and SpainPublication . Fernandes, Joana; Nogueira, Sónia P.Attracting tourists to rural areas is a complex challenge, often overshadowed by the allure of urban or beach destinations. Limited infrastructure, sparse amenities, and a lack of visibility in the tourism industry contribute to the difficulty in drawing visitors to these less-explored regions. Accessibility issues, stemming from limited transportation options, further deter potential tourists, as rural destinations may be challenging to reach compared to well-connected urban centres. To address these challenges, collaborative efforts are essential. Regional entities must work together to make rural areas more appealing to tourists seeking unique adventures off the beaten path. The visibility of rural destinations also requires collaborative promotional campaigns that leverage digital platforms and social media to reshape perceptions about rural travel. This study introduces a project aiming to develop an online platform supporting the structuring of tourist products in the cross-border areas of Northern Portugal and Castile and León in Spain. Focusing on nature tourism, wine and gastronomy, cultural and landscape tours, and active tourism, the project addresses common challenges such as aging populations, depopulation, and limited digital connectivity in both regions. By fostering collaboration and offering a structured approach to sustainable and ecological tourism, the project aims to enhance visitor attraction and promote synergies between the resources of both regions. The proposed online platform will provide comprehensive tourist information about the cross-border areas, facilitating the commercialization of tourist resources in a structured manner. Whether suggesting frequenting independent travellers or collaborating with tour operators and inbound travel agencies, the goal is to stimulate tourist attraction, prolong their stay in the region, and boost the economy of these cross-border areas.