Simoes-Marques M.J.,Portuguese Navy
Occupational Safety and Hygiene II - Selected Extended and Revised Contributions from the International Symposium Occupational Safety and Hygiene, SHO 2014 | Year: 2014
Emergency Management in the context of Disaster Relief operations places problems that are at the cross roads of many knowledge domains and involve many actors. Emergency Management is a complex process which calls for decision support tools. This paper discusses the characteristics Emergency Management Intelligent Systems should offer, and presents a fuzzy multicriteria methodology which can be used in the development of such systems. © 2014 Taylor & Francis Group, London, UK.
Simoes-Marques M.,Portuguese Navy
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013
Usability is a very important issue that affects the effectiveness and success of systems. Such importance becomes particularly critical when systems are complex, and when the accuracy and timeliness of operation is decisive to the system outputs. Naturally, the usability of decision support systems used for emergency management is of utmost relevance. The present paper addresses a usability study performed to the Portuguese Navy SINGRAR system. © 2013 Springer-Verlag Berlin Heidelberg.
Espiney Amaro C.,CUF Descobertas Hospital |
Espiney Amaro C.,Portuguese Navy |
Montalvao P.,CUF Descobertas Hospital |
Huins C.,Barts Royal London Hospitals |
Saraiva J.,CUF Descobertas Hospital
Journal of Laryngology and Otology | Year: 2015
Background: Lyme disease is an uncommon tick-borne multisystemic infection caused by Borrelia burgdorferi. The most common clinical manifestation is erythema migrans. In this report, a very unusual presentation of this condition is described, in which sudden onset sensorineural hearing loss was the sole presenting symptom. Methods: Case report and review of English-language literature. Results: A patient presented with sensorineural hearing loss, with no other symptoms or signs. Acute Lyme infection was detected by laboratory tests. Magnetic resonance imaging showed signs of labyrinthitis of the same inner ear. After hyperbaric oxygen and systemic antibiotic treatment, the patient showed total hearing recovery, and magnetic resonance imaging showed complete resolution of the labyrinthitis. Conclusion: To our knowledge, this is the first reported case of Lyme disease presenting only with sensorineural hearing loss. Borreliosis should be considered as an aetiological factor in sensorineural hearing loss. Adequate treatment may provide total recovery and prevent more severe forms of Lyme disease. © JLO (1984) Limited 2015.
Oliveira P.M.,Portuguese Navy |
Lobo V.,Higher Institute of Management
OCEANS 2013 MTS/IEEE - San Diego: An Ocean in Common | Year: 2013
When operating low cost autonomous vehicles, we are often faced with the need to apply integro-differential operators to numerical sequences. The need may arise in many different contexts, from vehicle navigation to data collection/estimation, and is strongly reinforced by constraints to the number of deployable sensors. Integration and, particularly, differentiation of discrete data sequences are, however, error prone operations. Even in the absence of noise, the traditional approaches introduce distortions and artifacts in the output data, mostly due to the mismatch between their underlying polynomial model and the spectral contents of the collected data. This article presents an alternative way to apply integro-differential operators to discrete data streams. The operators are applied in a strictly bandlimited way, in both time and frequency, and no extraneous artifacts are introduced in the data. No assumptions or models are used, other than assuming that the original data stream was correctly sampled. As such, the procedure can be safely applied to data streams sampled at rates close to Nyquist, without the usual performance degradation. © 2013 MTS.
Bugio T.M.A.,New University of Lisbon |
Martins R.F.,New University of Lisbon |
Martins R.F.,University of Lisbon |
Leal das Neves L.,Portuguese Navy
Engineering Failure Analysis | Year: 2013
This manuscript describes a failure analysis carried out in fuel tanks of a lightweight ship that was designed to operate not far from shore. The ship under study is a high speed light craft that was entirely designed and manufactured in Portugal and has been successfully operating as a patrol boat for several years. The vessel under study was manufactured with two types of naval aluminium series alloys, namely the 5083-H111 and the 6082-T6 alloys, which are commonly used in shipbuilding. The former alloy can be strain hardened by cold work and is used in the form of rolled plates and sheets for the vessel hull, the superstructure, and the bulkheads. The 6082-T6 alloy is a high-strength alloy that can be heat treated and softens near the heat affected zone during welding. It is used in the high-stressed structural members of the ship, namely in the stiffeners of the reinforced panels. The two fuel tanks under study are located at the rear of the ship, one at the starboard and the other at the portside. Cracks have propagated from the weld toe of some T-welded joints that possess low fatigue strength resistance. The welded joints were made using TIG and MIG processes and the weld quality was assessed by visual inspection, dye penetrant examination and radiography. The fuel tank's failure due to exfoliation, hot cracking, stress corrosion cracking or fatigue are analysed in the paper and it was concluded that fatigue is the most probable cause of failure. In addition, the 3D modelling of the current fuel tank geometry and its analysis by the finite element method (FEM) allowed the behaviour of the structure to be studied and it was discovered that the highest stressed regions were located at the reinforcement stiffeners where cracks nucleated and propagated. As a result, several alternative geometries for the fuel tanks were simulated in a FE computer code and it was possible to reduce the overall maximum stresses applied in the structure in the order of 65% with an increase of 20. kg per fuel tank to the total weight of the vessel. © 2013 Elsevier Ltd.
Santos N.P.,Portuguese Navy |
Lobo V.,Portuguese Navy |
Bernardino A.,University of Lisbon
MTS/IEEE OCEANS 2015 - Genova: Discovering Sustainable Ocean Energy for a New World | Year: 2015
It is presented a vision system based on a standard RGB digital camera to track an unmanned aerial vehicle (UAV) during the landing process aboard a ship. The developed vision system is located on the ship's deck and is used to track the UAV during all the landing process. A Ground-based vision system makes it possible to use an UAV with small size and weight, since the UAV will have less computer requirements. The proposed method uses a particle filter (PF) for pose estimation and an unscented Kalman filter (UKF) approach for filtering. This combination provides an adapted filtering framework for tracking. The implemented particle filter is inspired in the evolution strategies present in genetic algorithms with modifications in the mutation and crossover operators to avoid sample impoverishment. Results show that position and angular estimates precision is compatible with the automatic landing system requirements. © 2015 IEEE.
PubMed | University of Algarve, Instituto Portugues Of Oncologia Of Lisbon Francisco Gentil, Centro Hospitalar Of Lisbon Norte, Hospital do Espirito Santo and 2 more.
Type: Review | Journal: Head & neck | Year: 2016
Over the last decades, several therapeutic options were considered in the treatment of the osteoradionecrosis (ORN) of the mandible, including supportive measures, ultrasound therapy, corticosteroids, hyperbaric oxygen, surgical resection with reconstruction, and, more recently, drugs capable of reversing the fibroatrophic process. Once established, the ORN does not spontaneously disappear and a standard treatment has not yet been defined. The clear clinical effectiveness of hyperbaric oxygen therapy (HBOT) varies according to the literature and there are some economic/logistic issues to be considered; the triplet tocopherol/pentoxifylline/clodronate demands greater evidence from randomized clinical trials and also resilience from the patient, given the long treatment duration and its possible side effects. Controversy around the ideal treatment of the initial stage ORN of the mandible persists. More rigorous randomized prospective trials are essential. The purpose of this article was to review the relevant literature on the physiopathology of ORN of the mandible and discuss the new perspectives of its conservative treatment. 2016 Wiley Periodicals, Inc. Head Neck 38: 1708-1716, 2016.
Martins P.T.,University of Porto |
Martins P.T.,Portuguese Navy |
Oliveira E.,University of Porto
28th International Conference on Computer Applications in Industry and Engineering, CAINE 2015 | Year: 2015
This paper introduces a Multi-Agent System (MAS) for solving the crew resources distribution problem when a ship suffers several damages and priorities must be assign in order for it to survive. In our approach, the ship is the MAS environment and the attacker, equipment, crew and officers (the decision makers) are represented through agents. Decisions on resources assignment are taken after a negotiation process and using a kind of weighted utility-based selection process. We have followed a systematic Agent Oriented Software Engineering approach, called PORTO, to specify the implemented system. The final product is a method to evaluate new platforms survivability independently of crew effectiveness, which can also be used to find the best response procedure to deal with a damage event on board the platform, which than may be used for training of new crews.
Martins R.,University of Porto |
De Sousa J.B.,University of Porto |
Afonso C.C.,Portuguese Navy
Sea Technology | Year: 2011
The NATO Undersea Research Center (NURC) has devised the Recognized Environmental Picture 2010 experiment. It was to take place in the Alboran Sea with participants from 10 nations representing 27 organizations. The REP-AUV10 experiment was organized and planned by the Portuguese Navy in cooperation with Porto University the Naval Undersea Warfare Center Newport (NUWC), the Naval Research Laboratory and NURC. NURC participated in the event by producing remote-sensing bathymetry. The Naval Research Laboratory provided 72- hour forecasts for environmental modeling of sonar performance, general environmental characterization and thresholding for AUV operations. This information was uploaded daily to a dedicated FTP site created for the event. SeaCon AUV Based on evolutions of the Light Autonomous Vehicle developed by Porto University, the SeaCon AUV is targeted at innovative standalone or networked operations for applications in mine warfare, oceanography, mapping and rapid environmental assessment.
PubMed | Portuguese Navy, Centro Hospitalar Of Lisbon Central and Instituto Portugues Of Oncologia Of Lisbon Francisco Gentil
Type: | Journal: BMJ case reports | Year: 2016
Primary intracranial myxofibrosarcoma is exceedingly rare, with less than 10 cases published. We present a case of a 23-year-old man with previous history of a primary low grade myxofibrosarcoma of the left parietal-occipital convexity resected in March 1999. He subsequently underwent several interventions for multiple local recurrent disease until March 2004. At that time, complete remission was documented. About 8 years later, in February 2012, the patient was admitted to the emergency room with refractory acute pulmonary oedema. On work up, sustained monomorphic ventricular tachycardia and hyperechoic myocardial mass with invasion of the right ventricular cavity were detected. Electrical cardioversion was unsuccessful and irreversible cardiac arrest followed. The autopsy confirmed multiple bilateral lung metastases, malignant pulmonary embolism and myocardial invasion by the primary tumour, with intracavitary cardiac thrombosis and absence of intracranial disease. To the best of our knowledge, this is the first report of extracranial metastases of this neoplasm.