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Czyzowicz J.,University du Qubec en Outaouais | Dobrev S.,Slovak Academy of Sciences | Gonzlez-Aguilar H.,Research Center en Matematicas | Kralovic R.,Comenius University | And 4 more authors.
Theoretical Computer Science

We study the problem of computing locally a coloring of an arbitrary planar subgraph of a unit disk graph. Each vertex knows its coordinates in the plane and can communicate directly with all its neighbors within unit distance. Using this setting, first a simple algorithm is given whereby each vertex can compute its color in a 9-coloring of the planar graph using only information on the subgraph located within at most 9 hops away from it in the original unit disk graph. A more complicated algorithm is then presented whereby each vertex can compute its color in a 7-coloring of the planar graph using only information on the subgraph located within a constant number (201, to be exact) of hops away from it. © 2010 Elsevier B.V. All rights reserved. Source

Ben Mabrouk I.,University of Quebec at Outaouais | Hautcoeur J.,University du Qubec en Outaouais | Talbi L.,University of Quebec at Outaouais | Nedil M.,University of Quebec at Abitibi - Temiscamingue | Hettak K.,Communications Research Center Canada
IEEE Transactions on Antennas and Propagation

The performance of multiple-input-multiple-output (MIMO) system operating at the 60 GHz band is investigated based on experimental data in a real underground mine gallery. However, the millimeter wave (mmW) channels face some challenges such as high propagation loss. In order to overcome this issue, a planar microstrip antenna array has been designed, and fabricated. Moreover, the effect of miners' activity in the vicinity of the short-range wireless link is studied. Statistical parameters of the propagation channel, such as RMS delay spread, path loss, K-factor, channel correlation and capacity are extracted and analyzed. Results suggest that miners presence substantially affects both received power and time dispersion parameters and should therefore be considered when developing underground mine wireless networks in the unlicensed 60-GHz band. © 1963-2012 IEEE. Source

Gagnon S.,University du Qubec en Outaouais | Nabelsi V.,University du Qubec en Outaouais | Passerini K.,New Jersey Institute of Technology | Cakici K.,International Finance Corporation
IT Professional

Many vendors dream about making it big in the cloud, but licensing Web apps is a fiercely competitive market with rampant risks. Software as a service must overcome several challenges to prove itself as a successful business model. © 2011 IEEE. Source

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