
António FerreiraUniversity of Lisbon | UL · Department of Informatics
António Ferreira
PhD in Informatics
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58
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Introduction
Skills and Expertise
Publications
Publications (58)
A challenge in presenting augmented reality information, particularly in outdoor environments, is to distinguish the virtual symbols from the background image. In this paper we report on a user study that leverages prior knowledge about adaptations to improve symbol conspicuity by expanding its application to outdoor environments and mobile handhel...
In this paper we address the problem of information overload in synchronous group work: the large quantity of information, multiple information sources, and the need to sustain reciprocal interdependence have a negative impact on the capacity to attend to the group. We propose a group attention model characterizing the dynamic coupling between the...
In this work we approach the study of team situation awareness based upon a holistic perspective that integrates the shared and distributed nature of the construct. We studied team situation awareness in the context of critical incidents response management, as it constitutes a valuable asset and yet is continuously challenged by the very nature of...
Simple Summary
Peripheral nerve injuries are common in the clinical setting and may affect functionality by permanent monoplegia that could end in amputation. Electrical stimulation is an option to help recovery, in addition to exercises and locomotor training with a positive synergetic effect on nerve regeneration. These approaches could benefit f...
Traumatic nerve injuries are common lesions that affect several hundred thousand humans, as well as dogs and cats. The assessment of nerve regeneration trough animal models may provide information for translational research and future therapeutic options that can be applied mutually in veterinary and human medicine, in a one health perspective. Thi...
Simple Summary
Partial traumatic brachial plexus injury due to road traffic accidents is one of the most common and challenging disorders requiring neurorehabilitation in cats. The implementation of early intensive neurorehabilitation, including electrical stimulation with specific parameters and physical activity, may contribute to faster sensory-...
This prospective observational cohort pilot study included 22 cats diagnosed with partial traumatic brachial plexus injury (PTBPI), aiming to explore the response of an early intensive neurorehabilitation protocol in a clinical setting. This protocol included functional electrical stimulation (FES), locomotor treadmill training and kinesiotherapy e...
This prospective cohort pilot study included 22 cats diagnosed with partial traumatic brachial plexus injury (PTBPI), aiming to explore the response of an early intensive neurorehabilitation protocol. This protocol included functional electrical stimulation (FES), locomotor treadmill training and kinesiotherapy exercises, starting at the time with...
Introduction
Degenerative myelopathy (DM) is a neurodegenerative spinal cord disease with upper motor neurons, with progressive and chronic clinical signs, similar to amyotrophic lateral sclerosis (ALS). DM has a complex etiology mainly associated with SOD1 gene mutation and its toxic role, with no specific treatment. Daily intensive rehabilitation...
This prospective observational clinical study in a population of tetraplegic and paraplegic dogs (n = 488) with or without deep pain sensation, similar to humans ASIA A and B, investigated the prevalence of clinical occurrences in a rehabilitation center with a hospitalization regime between 15 days and 9 months. A checklist of occurrences was used...
The recent developments of mobile devices have enhanced the possibilities of applications of Augmented
Reality (AR), namely, providing data visualization in situ. The application prototype presented in this paper,
SolAR, designed for Android tablet devices, allows the user to extract financial and energy feedback from a
photovoltaic system, simulat...
Locomotor training (LT) is task-specific repetitive training, with sensorimotor stimulation and intensive exercises that promote neuromuscular reorganization. This study aimed to observe if LT could be initiated safely in the first 3–15 days after surgery in tetraplegic C1–C5 IVDD—Hansen type I dogs. This prospective blinded clinical study was cond...
Acute noncompressive nucleus pulposus extrusion (ANNPE) is related to contusive spinal cord injuries, and dogs usually appear to be exercising vigorously at the time of onset. ANNPE has a characteristic peracute onset of clinical signs during exercise or following trauma, with non-progressive signs during the first 24 h and possibly signs of spinal...
(1) Background: Systemic inflammatory response syndrome (SIRS) can occur due to a large number of traumatic or non-traumatic diseases. Hyperbaric oxygen therapy (HBOT) may be used as a main or adjuvant treatment for inflammation, leading to the main aim of this study, which was to verify the applicability of HBOT as a safe and tolerable tool in SIR...
Botanical Gardens are among the most visited touristic attractions, offering scientific, educational, cultural and leisure activities to preserve and enhance heritage and disseminating specialised knowledge on science and history. There are several mobile applications (apps) to support visitors of Botanical Gardens, which explore augmented reality...
We propose RoseTrajVis, a visual analytics system for studying commuting behaviours using classic rose diagrams, which, given a location in a map, aggregate trajectories by direction, show additional summary information, such as average speed bands, and allow the application of spatial-temporal filters. The rose diagrams also include colored arrows...
This retrospective controlled clinical study aimed to verify if intensive neurorehabilitation (INR) could improve ambulation faster than spontaneous recovery or conventional physiotherapy and provide a possible therapeutic approach in post-surgical paraplegic deep pain perception-positive (DPP+) (with absent/decreased flexor reflex) and DPP-negativ...
Background:
In veterinary medicine, wounds have a high incidence in clinical practice. A technique that can accelerate healing has been extensively studied, and the treatment with hyperbaric oxygen therapy (HBOT) is currently recognized as one of the best adjuvant treatments in this matter.
Aim:
The main objective of this pilot clinical study wa...
This case series study aimed to evaluate the safety, feasibility, and positive outcome of the neurorehabilitation multimodal protocol (NRMP) in 16 chronic post-surgical IVDD Hansen type I dogs, with OFS 0/DPP− (n = 9) and OFS 1/DPP+ (n = 7). All were enrolled in the NRMP for a maximum of 90 days and were clinically discharged after achieving ambula...
This article aimed to evaluate the safety and efficacy of intensive neurorehabilitation in paraplegic cats, with no deep pain perception (grade 0 on the modified Frankel scale), with more than three months of injury. Nine cats, admitted to the Arrábida Veterinary Hospital/Arrábida Animal Rehabilitation Center (CRAA), were subjected to a 12-week int...
In human medicine there was no evidence registered of a significant difference in recovery between body weight-supported treadmill training (BWSTT) and conventional over-ground (COGI). There isn't any similar study in veterinary medicine. Thus, this study aimed to compare the locomotor recovery obtained in incomplete SCI (T11–L3 Hansen type I) post...
Background
IsomiRs are miRNA variants that vary in length and/or sequence when compared to their canonical forms. These variants display differences in length and/or sequence, including additions or deletions of one or more nucleotides (nts) at the 5′ and/or 3′ end, internal editings or untemplated 3′ end additions. Most available tools for small R...
In this paper we present a system for analyzing tracks using graphics inspired in wind roses. The elements of the rose include petals that aggregate tracks given their direction and that also show their average speeds within an area around a point in a map, as well as arrows that point to the origin and destination of the tracks. The user can inter...
The use of mobile devices, such as smartphones and tablets, is widespread nowadays because they are portable, affordable, and offer a diversity of features. This type of equipment supports Augmented Reality (AR) applications, since they have all the necessary characteristics: good processing power, are equipped with cameras, sensors, such as accele...
We present an AR application for visualizing solar radiation data
on facades of buildings, generated from LiDAR data and climatic
observations. Data can be visualized using colored surfaces and
glyphs. A user study revealed the proposed AR visualizations
were easy to use, which can lead to leverage the potential benefits
of AR visualizations: to de...
A Realidade Aumentada (RA) tem vindo a atingir grandes desenvolvimentos aplicacionais na última década, em parte devido à expansão da indústria de dispositivos móveis e ao bom compromisso que apresentam entre a por-tabilidade, capacidade de processamento, e recursos de entrada e saída de dados. Neste artigo descrevemos a extensão de uma biblioteca...
Group support systems are becoming quite popular. They are also instigating large groups of people into collaborative practices. But research on large group collaborations is still very scarce, making it difficult to assess the benefits and drawbacks. This paper describes an empirical study with a group of 48 participants who used Google Maps to ac...
Radio frequencies for controller pilot communication are becoming a scarce resource due to increasing air traffic worldwide. The controller pilot data link communication (CPDLC) technology, which is already mandatory in new aircrafts, aims at reducing radio interferences and misunderstandings of commands by allowing routine voice conversations to b...
This paper discusses collaboration awareness from a cognitive perspective. Several models of the cognitive process are reviewed to distill awareness drivers that, when regarded in the collaboration context, set up a comprehensive view of collaboration awareness. Our major research goal is developing collaboration awareness support taking into consi...
Introduction: Shared workspace evaluation can be expensive and time consuming. It is also usually oriented towards high-level qualitative perspectives of the collaboration among users. A quantitative method is presented, giving emphasis to the low-level details of critical scenarios of shared workspace interaction, and allowing for comparisons of p...
In this paper we argue for buffering group awareness information to mitigate information overload and help users keep up with the group. We propose an attentive groupware device, called the opportunity seeker, that leverages the natural alternation between a user doing individual work and attending to the group to automatically manage the timing an...
We propose an attentive device for synchronous groupware systems to mitigate information overload. The opportunity seeker device leverages the users' natural alternation between doing individual work and attending to the group to dynamically manage the delivery timing and quantity of group awareness information that each user is exposed to. We desc...
We propose a technique based on human-performance models to evaluate the efficiency of shared workspaces, where individual and collaborative actions are intertwined. We apply the technique to an illustrative case and report that it: 1) facilitates the fine-grained analysis of workspace collaboration; 2) provides time predictions about collaborative...
We propose an analytic method to evaluate synchronous shared workspaces design. The method uses human-performance models, developed in the Human-Computer Interaction field, to make time predictions about collaborative actions performed in selected critical scenarios. We apply this method to two case studies: the design of a collaborative game and t...
In this paper we propose an analytical approach based on models of human performance to evaluate workspace collaboration. Our results indicate that the approach: 1) facilitates the fine-grained analysis of workspace collaboration; 2) provides quantitative estimates of collaborative actions executed in shared workspaces; and 3) affords comparing alt...
Apresentamos a arquitectura de um gestor de publicidade e os resultados de um ensaio de desempenho de um protótipo que a concretiza. O gestor de publicidade suporta a disponibilização, manutenção e contabilização de anúncios para múltiplos web sites, estando organizado em componentes distribuíveis. Medimos o número de pedidos de anúncios por segund...
A quantidade de dados gerada pelo registo de acessos efectuados a um servidor web, pode atingir grandes proporções quando este recebe um número elevado de visitas o que leva a que o processamento necessário à sua análise seja de grande complexidade. Esta informação é, no entanto, de elevada importância no planeamento estratégico de um negócio. Este...
We describe our approach for acquiring, preserving, organizing and disseminating information in a digital library of news publications.
The digital publishing group at the Informatics Department of FCUL studies new paradigms for processing heterogeneous information in organizations, combining multiple information processing technologies under a com...
Abstract We address the development of software devices that can be installed on groupware systems to help people stay attentive and be more productive during computer-mediated collaboration. We introduce a framework that derives attentive devices from groupware,mediation modes,to take into account attentional phenomena, and demonstrate the framewo...