Browsing by resource type "conference proceedings"
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- Analysis of the initial delamination size on the mode I interlaminar fracture of carbon/epoxy compositesPublication . Reis, P.N.B.; Ferreira, J.A.M.; Antunes, F.V.; Costa, J.D.M.; Capela, C.; Capela, Carlos;This paper describes an experimental study of the initial delamination length effects on the mode I fracture toughness using DCB tests. Delamination failure was also predicted using exponential cohesive model and a quite good agreement with experimental results was obtained. Numerical predictions showed a significant influence of initial delamination length on the force-displacement curves.
- A dual-band single-layer frequency selective surface for Wi-Fi applicationsPublication . Ferreira, David; Cuinas, Inigo; Caldeirinha, Rafael; Fernandes, Telmo, Telmo Rui Carvalhinho Cunha, Telmo R.This paper proposes a frequency selective surface (FSS) design to be used in Wi-Fi applications as either a reject or pass band single-layer filter. This design consists of a combination of canonical elements, i.e. ring loops/slots, and is tuned for both 2.4 and 5.2 GHz Wi-Fi frequency bands. It has a stable frequency response in the aforementioned Wi-Fi bands for incidence angles ranging from 0° to 45°. Both reject and pass band designs are presented, along with their respective unit cell dimensions and simulated frequency response. Active variants are also proposed and briefly evaluated which should allow for an on-off switching at the 2.4 and 5.2 GHz Wi-Fi bands. © 2015 EurAAP.
- Optimized Reference Picture Selection for Light Field Image CodingPublication . Monteiro, J. S. Ricardo; Nunes, J. L. Paulo; M. M. Rodrigues, Nuno; Faria, SergioThis paper proposes a new reference picture selection method for light field image coding using the pseudovideo sequence (PVS) format. State-of-the-art solutions to encode light field images using the PVS format rely on video coding standards to exploit the inter-view redundancy between each sub-aperture image (SAI) that composes the light field. However, the PVS scanning order is not usually considered by the video codec. The proposed solution signals the PVS scanning order to the decoder, enabling implicit optimized reference picture selection for each specific scanning order. With the proposed method each reference picture is selected by minimizing the Euclidean distance to the current SAI being encoded. Experimental results show that, for the same PVS scanning order, the proposed optimized reference picture selection codec outperforms HEVC video coding standard for light field image coding, up to 50% in terms of bitrate savings
- WINSYS 2009 - International Conference on Wireless Information Networks and Systems, Proceedings: ForewordPublication . Caldeirinha, Rafael; Obaidat, Mohammad S.We warmly welcome you to WINSYS 2009 - the International Conference on Wireless Information Networks and Systems, which is held, this year in Milan, Italy. This conference reflects a continuing effort to increase the dissemination of recent research among professionals who work on the field of Wireless Information Systems. WINSYS is integrated as one of the modules of the ICETE joint conference.