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Publications

2019

Code generator from mockups

Authors
Pereira, PFF; Rodrigues, F; Ferreira, C;

Publication
2019 14TH IBERIAN CONFERENCE ON INFORMATION SYSTEMS AND TECHNOLOGIES (CISTI)

Abstract
The automation of tasks is increasingly a current practice in the organizational environment, and this practice reduces the need for manpower and often reduces the errors associated with the human factor. In the present document a solution will be presented to automatically generate the source code of a mockup, having as input an image corresponding to the prototype. In the development of this project techniques of Deep Learning will be used, especially Convolutional Neural Networks for the detection and classification of objects in images. The developed solution provides the code base of a mockup in less than 60 seconds, with an average error rate 15.85%.

2019

Fiber-integrated phase-change reconfigurable optical attenuator

Authors
Martins, T; Gholipour, B; Piccinotti, D; MacDonald, KF; Peacock, AC; Frazao, O; Zheludev, NI;

Publication
APL PHOTONICS

Abstract
We report on the experimental demonstration of an optical-fiber-integrated, nonvolatile transmission switching device. The operating mechanism exploits a cavity resonance spectral shift associated with an induced change in the refractive index of a high-index thin film on the polished side facet of the fiber. In the present case, a thermally induced amorphous-crystalline structural transition in a 500 nm layer of germanium antimony telluride at a distance of 500 nm from the core-cladding interface of an SMF-28 single-mode fiber delivers resonant transmission contrast >0.5 dB/mm at 1315 nm. Contrast is a function of active layer proximity to the core, while operating wavelength is determined by layer thickness-varying thickness by a few tens of nanometers can provide for tuning over the entire near-infrared telecoms spectral range. (C) 2019 Author(s).

2019

Detecting changes in the heart rate of firefighters to prevent smoke inhalation and health effects

Authors
Sebastiao, R; Sorte, S; Valente, J; Miranda, AI; Fernandes, JM;

Publication
EVOLVING SYSTEMS

Abstract
Firefighters can suffer serious health problems and experience cardiac disorders derived from high pollutants inhalation. During experimental field burns, environmental and heart rate data from firefighters were collected and it was possible to observe that changes in heart rate were related with variations in pollutants inhalation. Therefore, detecting changes in heart rate may provide a good indicator to identify hazardous situations for firefighters. An automated method, based on the detection of changes in the heart rate, is proposed to prevent and to avoid serious undesirable side-effects in the health of firefighters due to pollutants inhalation. Within the experiments performed, a precision and a recall of 91.5 and 78.2%, respectively, were obtained. Furthermore, this approach can be part of a real-time decision support system for routine use in firefighting practice. Our results show the potential to provide effective support in real operational scenarios and that further research on the impact of environmental conditions in the well-being of firefighters is of utmost importance.

2019

First direct detection of an exoplanet by optical interferometry Astrometry and K-band spectroscopy of HR 8799 e

Authors
Lacour, S; Nowak, M; Wang, J; Pfuhl, O; Eisenhauer, F; Abuter, R; Amorim, A; Anugu, N; Benisty, M; Berger, JP; Beust, H; Blind, N; Bonnefoy, M; Bonnet, H; Bourget, P; Brandner, W; Buron, A; Collin, C; Charnay, B; Chapron, F; Clenet, Y; du Foresto, VC; de Zeeuw, PT; Deen, C; Dembet, R; Dexter, J; Duvert, G; Eckart, A; Schreiber, NMF; Fedou, P; Garcia, P; Lopez, RG; Gao, F; Gendron, E; Genzel, R; Gillessen, S; Gordo, P; Greenbaum, A; Habibi, M; Haubois, X; Haussmann, F; Henning, T; Hippler, S; Horrobin, M; Hubert, Z; Rosales, AJ; Jocou, L; Kendrew, S; Kervella, P; Kolb, J; Lagrange, AM; Lapeyrere, V; Le Bouquin, JB; Lena, P; Lippa, M; Lenzen, R; Maire, AL; Molliere, P; Ott, T; Paumard, T; Perraut, K; Perrin, G; Pueyo, L; Rabien, S; Ramirez, A; Rau, C; Rodriguez Coira, G; Rousset, G; Sanchez Bermudez, J; Scheithauer, S; Schuhler, N; Straub, O; Straubmeier, C; Sturm, E; Tacconi, LJ; Vincent, F; van Dishoeck, EF; von Fellenberg, S; Wank, I; Waisberg, I; Widmann, F; Wieprecht, E; Wiest, M; Wiezorrek, E; Woillez, J; Yazici, S; Ziegler, D; Zins, G;

Publication
ASTRONOMY & ASTROPHYSICS

Abstract
Aims. To date, infrared interferometry at best achieved contrast ratios of a few times 10(-4) on bright targets. GRAVITY, with its dual-field mode, is now capable of high contrast observations, enabling the direct observation of exoplanets. We demonstrate the technique on HR 8799, a young planetary system composed of four known giant exoplanets. Methods. We used the GRAVITY fringe tracker to lock the fringes on the central star, and integrated off-axis on the HR 8799 e planet situated at 390 mas from the star. Data reduction included post-processing to remove the flux leaking from the central star and to extract the coherent flux of the planet. The inferred K band spectrum of the planet has a spectral resolution of 500. We also derive the astrometric position of the planet relative to the star with a precision on the order of 100 mu as. Results. The GRAVITY astrometric measurement disfavors perfectly coplanar stable orbital solutions. A small adjustment of a few degrees to the orbital inclination of HR 8799 e can resolve the tension, implying that the orbits are close to, but not strictly coplanar. The spectrum, with a signal-to-noise ratio of approximate to 5 per spectral channel, is compatible with a late- type L brown dwarf. Using Exo-REM synthetic spectra, we derive a temperature of 1150 +/- 50 K and a surface gravity of 10(4.3 +/- 0.3) cm s(2). This corresponds to a radius of 1.17(-0.11)(+0.13) R-Jup and a mass of 10(-4)(+7) M-Jup, which is an independent confirmation of mass estimates from evolutionary models. Our results demonstrate the power of interferometry for the direct detection and spectroscopic study of exoplanets at close angular separations from their stars.

2019

Multidimensional Design Assessment Model for eco-efficiency and efficiency in aeronautical assembly processes

Authors
Lourenco, EJ; Oliva, M; Estrela, MA; Baptista, AJ;

Publication
Proceedings - 2019 IEEE International Conference on Engineering, Technology and Innovation, ICE/ITMC 2019

Abstract
This manuscript presents a novel framework, the Multidimensional Design Assessment Model, which encompasses a multi-criteria approach to efficiency, eco-efficiency and costs assessment for a given design system in aeronautical industry production. The framework is established by adopting Design-for-X and Multi-Layer Stream Mapping approaches, based on Lean Thinking, for efficiency assessment and adopting modules of ecoPROSYS to eco-efficiency assessment. A real case study from aeronautical sector is given to demonstrate the approach, for the assembly of aircraft structure Horizontal Tale Plane, where different results are presented and discussed for each dimension of analysis and how improvement strategies can be designed. © 2019 IEEE.

2019

Paper-Based Biosensors for Analysis of Water

Authors
S. Peixoto, P; Machado, A; P. Oliveira, H; A. Bordalo, A; A. Segundo, M;

Publication
Environmental Biosensors [Working Title]

Abstract

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