Encontrados 6 documentos, a visualizar página 1 de 1
User centric community clouds
Barraca, João Paulo Silva; Matos, Alfredo; Aguiar, Rui LuísWith the evolution in cloud technologies, users are becoming acquainted with seamless service provision. Nevertheless, clouds are not a user centric technology, and users become completely dependent on service providers. We propose a novel concept for clouds, where users self-organize to create their clouds. We present such an architecture for user-centric clouds, which relies on self-managed clouds based on do...
Physical behavior of eigenvalues and singular values in matrix decompositions
Huda, Azmol; Aguiar, Rui LuisAn apposite as well as realistic treatment of eigenvalue and singular value problems are potentially of interest to a wide variety of people, including among others, design engineers, theoretical physicists, classical applied mathematics and numerical analysis who yearn to carry out research in the matrix field. In real world, it is extensively used but at sometimes scantily understood. This paper focuses on bu...
Cooperative performance bounds of Wireless Local Area Networks
Sadeghi, Rasool; Barraca, João Paulo; Aguiar, Rui LuísIn a Wireless Local Area Network (WLAN), capacity gain and delay reduction play a crucial role in system performance. In this paper, we focus on performance improvements when WLANs exploit the concept of cooperation among nodes. We propose a geometrical model to determine the potential location area of relay nodes. The analytical results are validated by simulation. Performance bounds and average of capacity ga...
Deliverable D4.1: VLC modulation schemes
Kumar, Navin; Figueiredo, Mónica; Alves, Luis Nero; Aguiar, Rui LuísThis report presents the analysis of different modulation schemes D4.1 for VLC systems of the VIDAS project. Considering the final prototype design and application, the deliverable D4.1 was projected. The detail analysis of various modulation schemes are carried out and a robust technique based on direct sequence spread spectrum (DSSS) is followed. DSSS technique though necessitates use of high bandwidth while ...
Users, Economics, Technology: Unavoidable Interdynamics
Aguiar, Rui Luís; Onur, Ertan; Skouby, Knud Erik; Aguayo-Torres, Mari Carmen; Toftegaard, Thomas SkjødebergThis paper briefly presents some conclusions of a brainstorming session on the way technology is evolving in ICT. Technology advances have overcome society ability to answer, both in economic and in human aspects. The current design paradigms, of agnostic technology development, need to be reconsidered, and the user needs to be repositioned at the center of future developments.
FastM: Design and Evaluation of a Fast Mobility Mechanism for Wireless Mesh Net...
Couto, Luís; Barraca, João; Sargento, Susana; Aguiar, Rui LuísAlthough there is a large volume of work in the literature in terms of mobility approaches for Wireless Mesh Networks, usually these approaches introduce high latency in the handover process and do not support realtime services and applications. Moreover, mobility is decoupled from routing, which leads to inefficiency to both mobility and routing approaches with respect to mobility. In this paper we present a n...
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