126 documents found, page 1 of 13
On the performance of partial LIS for 6G systems
Silva, M. M. da.; Gashtasbi, A.; Dinis, R.; Pembele, G.; Correia, A.; Guerreiro, J.One of the key technologies of 6G communications relies on large intelligent surfaces (LIS), which can be viewed as a near-field beamformer that is supportive of extremely high symbol rates and enables a high level of interference avoidance. This article focuses on LIS systems, analysing the impact of the use of a whole LIS system or a subset of an antenna array. We analyse an LIS system associated with a singl...
System-level assessment of massive multiple-input–multiple-output and reconfigu...
Pavia, J. P.; Velez, V.; Souto, N.; Silva, M. M. Da; Correia, A.In this article, we investigate in different scenarios the feasibility of using massive multiple-input–multiple-output (mMIMO) with reconfigurable intelligent surfaces (RISs) to increase the throughput and coverage with high energy efficiency, considering sub-6 GHz, mmWave, and THz bands. With that objective, a centralized radio access network (C-RAN) suitable for beyond fifth-generation (B5G) systems is consid...
Robotics applications in the hospital domain: A literature review
Cruz, E. M. G. N. V.; Oliveira, S. M.; Correia, A.Robotic systems are increasingly being used in healthcare. These systems improve patient care both by freeing healthcare professionals from repetitive tasks and by assisting them with complex procedures. This analysis examines the development and implementation of the use of robotic systems in healthcare. It also examines the application of artificial intelligence (AI), which focuses on the autonomy of robotic ...
ARF@Pt creating free easy access economic analysis for Portuguese forests
Barreiro, Susana; Coelho, M.; Correia, A.; Tomé, Margarida
Optimization of a protocol for isolation of immune cells from European seabass ...
Salazar-Gutierrez, D.; Ferreira, M.; Sousa, V.; Valente, L. M. P.; Correia, A.; Gomes, S.Background: As one of the most important food production sectors worldwide, aquaculture is now invested in developing tools to study fish immunity. Fish health relies heavily on hematopoietic organs (head kidney), but also on intestine. The wide knowledge-gap of the fish immune system coupled with the lack of cell lines to perform in vitro studies poses a barrier to the development of efficient tools to enhance...
An optimized planning tool for microwave terrestrial and satellite link design
Ferreira, E.; Sebastião, P.; Cercas, F.; Costa, C. S.; Correia, A.Today, the internet is fundamental to social inclusion. There are many people that live in remote areas, and the only way to supply internet services is through the use of microwave terrestrial and satellite systems. Thus, it is important to have efficient tools to design and optimize these systems. In this paper, a tool with the objective to shorten the time spent in the design process of microwave terrestrial...
Performance assessment of a RIS-empowered post-5G/6G network operating at the m...
Velez, V.; Pavia, J. P.; Souto, N.; Sebastião, P.; Correia, A.Reconfigurable Intelligent Surfaces (RISs) are considered to be a key enabling technology for 6G as they can potentially provide a boost in performance with a high energy efficiency. RISs rely on the use of arrays with a large number of low-cost quasi-passive reflecting elements which can be individually tuned in order to shape the radio wave propagation. This can effectively enable the implementation of smart ...
The travel dream experience in pandemic times
Correia, A.; Moro, S.; Rita, P.This study was developed to understand how tourists feel after dreamed travel experiences ended up cancelled. The orchestra model that considers experiences as an intermingled process was applied to analyse the negative feelings experienced by tourists during these pandemic times. Through web scraping, over 40 thousand comments from 600 threads discussing the pandemic impact on tourists’ inability to concretize...
Insights about the Sines massif: a reinterpretation of geophysical data to the ...
Marques, F.; Pedro, J.; Araújo, A.; Moita, P.; Carneiro, J.; Sousa, P.; Carvalho, J.; Correia, A.The InCarbon project aims to evaluate the potential for storage of captured CO2 using in-situ mineral carbonation in mafic and ultramafic plutonic rocks in Alentejo, Portugal. The Sines massif appears to be the most promising massif for mineral carbonation and its geochemistry, petrography, mineralogy, volume and extension are characterized. Its offshore volume and extension are evaluated through reinterpretati...
What are Airbnb hosts advertising? A longitudinal essay in Lisbon
Santos, M.; Correia, A.; Ribeiro, R.; Batista, F.Purpose – Considering the importance of the content created by the host for Airbnb consumers while making purchasing decisions, this study aims to analyze how the Airbnb hosts promote their properties by revealing the predominant attributes considered by hosts when advertising them. Design/methodology/approach – The unstructured textual content of online Airbnb accommodations advertisements (property descriptio...