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Publications

2016

Expeditious illustration of layer-cake models on and above a tactile surface

Authors
Lopes, DS; Mendes, D; Sousa, M; Jorge, J;

Publication
COMPUTERS & GEOSCIENCES

Abstract
Too often illustrating and visualizing 3D geological concepts are performed by sketching in 2D mediums, which may limit drawing performance of initial concepts. Here, the potential of expeditious geological modeling brought by hand gestures is explored. A spatial interaction system was developed to enable rapid modeling, editing, and exploration of 3D layer-cake objects. User interactions are acquired with motion capture and touch screen technologies. Virtual immersion is guaranteed by using stereoscopic technology. The novelty consists of performing expeditious modeling of coarse geological features with only a limited set of hand gestures. Results from usability-studies show that the proposed system is more efficient when compared to a windows-icon-menu-pointer modeling application.

2016

Searching for Opportunities and Trust in International Markets

Authors
Carvalheira, AMB; Moreira, A;

Publication
Advances in Electronic Government, Digital Divide, and Regional Development - Handbook of Research on Entrepreneurial Success and its Impact on Regional Development

Abstract
Internationalization has been adopted by many companies, regardless of size, to boost their growth. Although the Uppsala model and the network approach have been extensively used to analyze how small firms internationalize their operations, this chapter addresses how a small firm of the clean carpentry industry managed to overcome an economic slowdown of its domestic market and boosted its growth. This chapter uses a case study approach that is framed on a literature review covering internationalization of SMEs, entrepreneurship, the importance of the network approach, the search of opportunities and trust, and relationship orientation to show how a firm abandoned its passive behavior and its focus on the domestic market to proactively address the international market following an entrepreneurial perspective.

2016

Human Activity Recognition by Means of Online Semi-supervised Learning

Authors
Cardoso, HL; Moreira, JM;

Publication
IEEE 17th International Conference on Mobile Data Management, MDM 2016, Porto, Portugal, June 13-16, 2016 - Workshops

Abstract

2016

Coordination Models and Languages - 18th IFIP WG 6.1 International Conference, COORDINATION 2016, Held as Part of the 11th International Federated Conference on Distributed Computing Techniques, DisCoTec 2016, Heraklion, Crete, Greece, June 6-9, 2016, Proceedings

Authors
Lafuente, AL; Proença, J;

Publication
COORDINATION

Abstract

2016

UAV Trials for Multi-Spectral Imaging Target Detection and Recognition in Maritime Environment

Authors
Silva, H; Almeida, JM; Lopes, F; Ribeiro, JP; Freitas, S; Amaral, G; Almeida, C; Martins, A; Silva, E;

Publication
OCEANS 2016 MTS/IEEE MONTEREY

Abstract
This paper addresses the use of heterogeneous sensors for target detection and recognition in maritime environment. An Unmanned Aerial Vehicle payload was assembled using hyperspectral, infrared, electro-optical, AIS and INS information to collect synchronized sensor data with vessel ground-truth position for conducting air and sea trials. The data collected is used to develop automated robust methods for detect and recognize vessels based on their exogenous physical characteristics and their behaviour across time. Data Processing preliminary results are also presented.

2016

Temperature-independent strain sensor based on a tapered Bragg fibre fabricated using a CO2 laser

Authors
Martins, TJM; Marques, MB; Roy, P; Jamier, R; Fevrier, S; Frazao, O;

Publication
SIXTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS

Abstract
Temperature-independent strain measurement is achieved resorting to a taper fabricated on a Bragg fibre using a CO2 laser. The characteristic bimodal interference of an untapered Bragg fibre is rendered multimode after taper fabrication and the resulting transmission spectra are analysed as temperature and strain change. The intrinsic strain sensitivity exhibited by the Bragg fibre is increased 15 fold after tapering and reaches 22.68 pm/mu epsilon. The difference in wavelength shift promoted by variations in temperature and strain for the two fringes studied is examined and strain sensing with little temperature sensitivity is achieved, presenting a sensitivity of 2.86 pm/mu epsilon, for strain values up to 400 mu epsilon.

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