Escola Superior de Tecnologia e Gestão
Permanent URI for this community
Browse
Browsing Escola Superior de Tecnologia e Gestão by Sustainable Development Goals (SDG) "08:Trabalho Digno e Crescimento Económico"
Now showing 1 - 10 of 33
Results Per Page
Sort Options
- 802.21-MPA-IMS ArchitecturePublication . Rodrigues, Carlos Miguel de Jesus; Rabadão, Carlos; Pereira, AntónioMobility has become a keyword nowadays with the evolution of mobile devices market and proliferation of realtime services. IP Multimedia Subsystem (IMS) is a single, standardized service framework that supports voice, video, data and messaging services, but does not provide seamless mobility for packet based sessions. This paper purposes an IMS architecture with IEEE 802.21 and media-independent pre-authentication (MPA) integrated. IEEE 802.21 can enable this seamless mobility in IMS and, additionally, MPA provides a secure handover optimization scheme, reducing, as a consequence, handover latency. The main goal of this architecture is to provide seamless and secure handovers between different access technologies in an IMS-based environment.
- Alternative heavy tailed models in seismologyPublication . Felgueiras, Miguel; Martins, João; Santos, RuiGreat earthquakes are commonly considered as the ones with moment magnitude (Mw ) above or equal to 8.0. Since these earthquakes can destroy entire communities located near the epicentre, the search of physical laws that explain the energy released by them is an important issue. There is a connection between the radiated energy of an earthquake, its magnitude and its seismic moment (M 0). Thence, when fitting a heavy or an extremely heavy tailed distribution to a seismic moment dataset, we are in fact adjusting a mathematical model which explains the amount of energy released by these great seisms. Therefore, the main goal of this work is to study the more appropriated Pareto based models (the most used family in this field) when explaining the seismic moment of the great earthquakes. With this purpose in mind, we selected two different catalogs that accommodate recent events and are considered more accurate than other catalogs used in previous works. We conclude that the traditional Pareto distribution remains a good choice to deal with this kind of data, but Log-Pareto lead to higher p-values and Location-scale Pareto is better fitted to the biggest events.
- Building Strategic Capabilities in Brazilian FirmsPublication . Fleury, Maria Tereza Leme; Calixto, Cyntia Vilasboas; Frias Pinto, Cláudia Sofia; Fleury, AfonsoIn this chapter, we highlight the strategic capabilities that have enabled six Brazilian companies to achieve competitive advantage. We selected firms from different industries and stages of internationalization in order to show a broad perspective of local and international successful firms. WEG and Fanen developed technological capabilities associated to both world-class manufacturing and product innovation, whereas Stefanini and Integration have consolidated knowledge about servicing emerging markets. Grendene’s production and operations are its key capabilities for international operations through exports, while innovative design and processes support their strategy in the local markets. The key capabilities of Dr.Consulta are entrepreneurship and innovation. In sum, due to highly turbulent institutional and economic environment, Brazilian firms have had to develop some specific capabilities, especially those related to financial management and organizational flexibility.
- Characterising Enterprise Application Integration Solutions as Discrete-Event SystemsPublication . Sawicki, Sandro; Frantz, Rafael Z.; Basto-Fernandes, Vitor; Fabricia Roos-Frantz, Fabricia; Yevseyeva, Iryna; Corchuelo, RafaelIt is not difficult to find an enterprise which has a software ecosystem composed of applications that were built using different technologies, data models, operating systems, and most often were not designed to exchange data and share functionalities. Enterprise Application Integration provides methodologies and tools to design and implement integration solutions. The state-of-the-art integration technologies provide a domain-specific language that enables the design of conceptual models for integration solutions. The analysis of integration solutions to predict their behaviour and find possible performance bottlenecks is an important activity that contributes to increase the quality of the delivered solutions, however, software engineers follow a costly, risky, and time-consuming approach. Integration solutions shall be understood as a discrete-event system. This chapter introduces a new approach based on simulation to take advantage of well-established techniques and tools for discrete-event simulation, cutting down cost, risk, and time to deliver better integration solutions.
- O efeito do greenwashing no consumo ético mediado pela confusão verde e pelo ódio à marcaPublication . Santos, Célia; Coelho, Arnaldo; Marques, AlziraO greenwashing verifica-se quando as empresas enganam os consumidores quanto às suas práticas ambientais ou benefícios dos seus produtos/serviços. Esta investigação centra-se nos impactos dessas práticas no consumo ético e analisa como a confusão verde e o ódio à marca atuam como mediadores nessa relação. Baseado em informações recolhidas por meio de questionário aplicado numa amostra de 420 consumidores portugueses, foi realizado estudo confirmatório, quantitativo e transversal (ou de corte único). A análise foi conduzida através de um modelo de equações estruturais com o software SmartPLS. Os resultados sugerem que o greenwashing aumenta a confusão verde entre os consumidores, dificultando a correta interpretação de aspetos ambientais de um produto/serviço. Além disso, o greenwashing gera emoções negativas extremas, como o ódio à marca. Os resultados também demostram que os consumidores, quando percecionam práticas de greenwashing por parte de uma empresa/marca tendem a deixar de comprar os seus produtos/serviços, optando por alternativas mais éticas e responsáveis. Foi estabelecida relação positiva direta e indireta entre greenwashing e consumo ético. Esta investigação avança o estado da arte, que carece de estudos relacionados com as consequências das práticas de greenwashing e elucida as empresas da necessidade de eliminar essas atividades enganadoras e irresponsáveis. Limitações e oportunidades de estudo futuras são abordadas.
- Elder Care Modular SolutionPublication . Marcelino, Isabel; Pereira, António Manuel de JesusThe Elder Care solution has two primary goals: monitoring vital signs, sending alerts to family and specialized help and provide a social network in order to wrap all older population to avoid social isolation [1][2]. In this paper we will show the methodology used to obtain Elder Care's architecture and point some guidelines to our present work: Elder Care's implementation.
- Estimation of prevalence in rare disease using pooled samplesPublication . Martins, J. P.; Santos, R.; Felgueiras, M.The use of pooled samples for screening infected individuals is a known procedure to reduce costs. In an estimation problem, the aim is only to determine how many individuals are infected instead of determining who is infected (classification problem). In that setting, our goal was to compare the performance of using one or two-dimensional arrays. The best performance was established according to one of the following criteria: minimizing the number of individuals or the number of tests required to attain a certain estimate accuracy. It is observed that when we want to minimize the number of individuals used, the two-dimensional procedures have a little advantage over the one-dimensional procedures. However, when the major concern is the cost, the one-dimensional procedures clearly outperform the two-dimensional procedures.
- Fighting Elders’ Social and Technological Exclusion: The TV Based ApproachPublication . Correia, Luís; Costa, Nuno; Pereira, AntónioWe are assisting to the fastest grow of senior population ever and that tendency has brought several challenges for governments, families and for the elderly. The society was not prepared for that. On the one hand, there are many elderly who live alone in the cities and, on the other hand, active people is moving to the cities looking for a better life while leaving behind the villages where they born and grow and the older family members. On the other side, everyone is expecting the aid of technology in order to solve or at least minimize this problem. This paper present a video-calling service targeted for elderly social and technological exclusion and promoting socialization while using recent technology embedded into well-known electronic devices like TVs. The evaluation of results showed that when assisted technology is encapsulated into everyday objects, older people can use it seamlessly, without any learning curve.
- Financial Structure, Product Market Decisions and Default Risk in an Asymmetric DuopolyPublication . Costa, Magali; Pires, Cesaltina PachecoFinancial and output market decisions are crucial to the success or failure of an organization. In this paper we analyze the equilibrium default risk in a two-stage duopoly model with an uncertain environment, where firms decide their financial structure in the first stage of the game and decide their quantities in the second stage of the game. Using numerical analysis, we analyze the impact of changing the asymmetry in the two firms' marginal costs on the equilibrium default risk. Our results show that as a firm becomes less efficient it is optimal to reduce its debt level and the quantity produced. The reverse is true for the more efficient firm. This behavior implies that although higher marginal cost leads to lower profits, the less efficient firm reduces its default probability due to a more cautious behavior in the financial and product market. © Springer International Publishing Switzerland 2015. All rights reserved.
- From Desalination to Governance: A Comparative Study of Water Reuse Strategies in Southern European HospitalityPublication . Santos, EleonoraAs climate change intensified water scarcity in Southern Europe, tourism-dependent regions such as Portugal’s Algarve faced growing pressure to adapt their water management systems. This study investigated how hotel groups in the Algarve have adopted and communicated water reuse technologies—specifically desalination and greywater recycling—under environmental, institutional, and reputational constraints. A comparative qualitative case study was conducted involving three hotel groups—Vila Vita Parc, Pestana Group, and Vila Galé—selected through purposive sampling based on organizational capacity and technology adoption stage. The analysis was supported by a supplementary mini-case from Mallorca, Spain. Publicly accessible documents, including sustainability reports, media coverage, and policy frameworks, were thematically coded using organizational environmental behavior theory and the OECD Principles on Water Governance. The results demonstrated that (1) higher organizational capacity was associated with greater maturity in water reuse implementation; (2) communication transparency increased alongside technological advancement; and (3) early-stage adopters encountered stronger financial, regulatory, and operational barriers. These findings culminated in the development of the Maturity–Communication–Governance (MCG) Framework, which elucidates how internal resources, stakeholder signaling, and institutional alignment influence sustainable infrastructure uptake. This research offered policy recommendations to scale water reuse in tourism through financial incentives, regulatory simplification, and public–private partnerships. The study contributed to the literature on sustainable tourism and decentralized climate adaptation, aligning with UN Sustainable Development Goals 6.4, 12.6, and 13.