Luis Almeida
University of Porto
Distributed computingComputer networkComputer scienceMedicineReal-time computing
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Publications 486
#1Moses A. Koledoye (UNIPV: University of Pavia)H-Index: 1
#2Tullio Facchinetti (UNIPV: University of Pavia)H-Index: 14
Last. Luis Almeida (University of Porto)H-Index: 38
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The performance of indoor localization techniques adopted in robot localization systems that use radio positioning is usually degraded in non-line-of-sight (NLOS) environments. In this paper, we propose a technique for estimating NLOS biases and measurement noise in distances under multidimensional scaling (MDS) based positioning with fixed nodes. An ideal matrix of pairwise distance measurements exhibits a symmetry that allows to compute mobile node positions from those of fixed ones, and then ...
#1Felisberto PereiraH-Index: 1
Last. Luis AlmeidaH-Index: 38
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The research of safety applications in vehicular networks has been a popular research topic in an effort to reduce the number of road victims. Advances on vehicular communications are facilitating information sharing through real time communications, critical for the development of driving assistance systems. However, the communication by itself is not enough to reach the most desired target as we need to know which safety-related information should be disseminated. In this work, we bring passiv...
#1Aqsa AslamH-Index: 2
Last. Luis AlmeidaH-Index: 38
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Vehicular ad-hoc networks (VANET) enable vehicles to exchange information on traffic conditions, dynamic status and localization, to enhance road safety and transportation efficiency. A typical VANET application is platooning, which can take advantage of exchanging information on speed, heading and position to allow shorter inter-vehicle distances without compromising safety. However, the platooning performance depends drastically on the quality of the communication channel, which in turn is hig...
2 CitationsSource
#1Leonor MeiraH-Index: 2
#2Catarina Chaves (RMIT: RMIT University)H-Index: 2
Last. Helder BastosH-Index: 5
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Abstract Setting University-affiliated hospital located in Porto, North Portugal, an area with a low to intermediate incidence of tuberculosis (TB). Objective To identify predictors and outcomes of disseminated TB (dTB). Design A cohort of patients diagnosed with TB between 2007 and 2013 was retrospectively analysed. Patients with dTB criteria were characterized and compared to single organ TB cases. Factors independently associated with dTB were determined by multivariate logistic regression an...
#1Daniel C. RamosH-Index: 2
#1Daniel RamosH-Index: 18
Last. Ubirajara F. MorenoH-Index: 7
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The increasing use of mobile cooperative robots in a variety of applications also implies an increasing research effort on cooperative strategies solutions, typically involving communications and control. For such research, simulation is a powerful tool to quickly test algorithms, allowing to do more exhaustive tests before implementation in a real application. However, the transition from an initial simulation environment to a real application may imply substantial rework if early implementatio...
Oct 1, 2019 in SMC (Systems, Man and Cybernetics)
#1Luis AlmeidaH-Index: 38
Last. Gabriel PiresH-Index: 14
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Over the past few years, virtual and mixed reality systems have evolved significantly yielding high immersive experiences. Most of the metaphors used for interaction with the virtual environment do not provide the same meaningful feedback, to which the users are used to in the real world. This paper proposes a cyber-glove to improve the immersive sensation and the degree of embodiment in virtual and mixed reality interaction tasks. In particular, we are proposing a cyber-glove system that tracks...
Ethernet is a popular networking technology in factory automation and industrial embedded systems, frequently using a ring topology for improved fault-tolerance. As many applications demand ever shorter cycle times and a higher number of nodes, the popular ring endure to remain as a valid topology. In this work, we discuss the factors that determine the ring network delay and show how they affect the network cycle time. Since increasing the link capacity has limited reach, we explore a time-trig...
Last. Ana AguiarH-Index: 9
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Due to multiple reasons, emergency wards can become overloaded with patients, some of which can be in critical health conditions. To improve the emergency service and avoid deaths and serious adverse events that could be potentially prevented, it is mandatory to do a continuous monitoring of patients physiological parameters. This is a good fit for Internet of Things (IoT) technology, but the scenario imposes hard constraints on autonomy, connectivity, interoperability, and delay. In this paper,...
2 CitationsSource
#1Shashank Gaur (P.PORTO: Polytechnic Institute of Porto)H-Index: 2
#2Luis Almeida (University of Porto)H-Index: 38
Last. Radha Reddy (P.PORTO: Polytechnic Institute of Porto)
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Context-awareness is a prominently desired feature in computing systems. Smartphones, smart cards or tags, wearables, sensor nodes, and many other devices enable a system to compute context for different users and environment. With ever increasing advances in hardware for such devices, the interactions with users are increasing every day. This enables the collection of a large amount of data about users, systems, and physical environment. With such data available to be leveraged, context-awarene...