17 documents found, page 1 of 2
Intelligent platform for automating vulnerability detection in web applications
Moreira, D.; Seara, J. P.; Pavia, J. P.; Serrão, C.In a world increasingly dependent on technology and in an era where connectivity is omnipresent, Web applications have become an essential part of our everyday life. The evolution of these applications, combined with the exponential increase in the number of users, has brought with it not only convenience but also significant challenges in terms of security. Ensuring the security of Web applications and their d...
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...
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 ...
O alojamento local e a reabilitação de edifícios habitacionais em Lisboa: Explo...
Vicente, M.; André, P.; Pavia, J. P.O turismo e, em particular, o Alojamento Local são amplamente referidos como fatores que têm dinamizado a reabilitação do património edificado das zonas históricas da cidade de Lisboa. No entanto, existe pouca informação sobre a forma como essa reabilitação está a ser realizada. Com vista a contribuir para o conhecimento sobre as transformações que os edifícios têm vindo a sofrer, neste ensaio são analisadas as...
YOLOX-Ray: An efficient attention-based single-staged object detector tailored ...
Raimundo, A.; Pavia, J. P.; Sebastião, P.; Postolache, O.Industrial inspection is crucial for maintaining quality and safety in industrial processes. Deep learning models have recently demonstrated promising results in such tasks. This paper proposes YOLOX-Ray, an efficient new deep learning architecture tailored for industrial inspection. YOLOX-Ray is based on the You Only Look Once (YOLO) object detection algorithms and integrates the SimAM attention mechanism for ...
System-level assessment of low complexity hybrid precoding designs for massive ...
Pavia, J. P.; Velez, V.; Souto, N.; Ribeiro, M.; Sebastião, P.; Correia, A.The fast growth experienced by the telecommunications field during the last few decades has been motivating the academy and the industry to invest in the design, testing and deployment of new evolutions of wireless communication systems. Terahertz (THz) communication represents one of the possible technologies to explore in order to achieve the desired achievable rates above 100 Gbps and the extremely low laten...
Phase shift optimization algorithm for achievable rate maximization in reconfig...
Praia, J.; Pavia, J. P.; Souto, N.; Ribeiro, M.Terahertz (THz) band communications are considered a crucial technology to support future applications, such as ultra-high bit rate wireless local area networks, in the next generation of wireless communication systems. In this work, we consider an ultra-massive multiple-input multiple-output (UM-MIMO) THz communication system operating in a typical indoor scenario where the direct link between the transmitter ...
System-level assessment of a C-RAN based on generalized space–frequency index m...
Velez, V.; Pavia, J. P.; Rita, C.; Gonçalves, C.; Souto, N.; Sebastião, P.; Correia, A.Index modulation (IM) has been attracting considerable research efforts in recent years as it is considered a promising technology that can enhance spectral and energy efficiency and help cope with the rising demand of mobile traffic in future wireless networks. In this paper, we propose a cloud radio access network (C-RAN) suitable for fifth-generation (5G) and beyond systems, where the base stations (BSs) and...
Low complexity hybrid precoding designs for multiuser mmWave/THz ultra massive ...
Pavia, J. P.; Velez, V.; Branco Ferreira, R.; Souto, N.; Ribeiro, M.; Silva, J.; Dinis, R.Millimeter-wave and terahertz technologies have been attracting attention from the wireless research community since they can offer large underutilized bandwidths which can enable the support of ultra-high-speed connections in future wireless communication systems. While the high signal attenuation occurring at these frequencies requires the adoption of very large (or the so-called ultra-massive) antenna arrays...
Design of a reconfigurable THz filter based on metamaterial wire resonators wit...
Pavia, J. P.; Souto, N.; Ribeiro, M.A study on the design, simulation and characterization of a reconfigurable terahertz (THz) filter, composed of two frequency-selective surfaces (FSSs) with applications on sensor devices in general and highly sensitive stress sensors, is presented in this paper. Using the developed theoretical model, we found out that by careful tuning the wire parameters, it is possible to control the filter sensitivity and al...