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Mahdoum A.,Algerian Center de Developpement des Techniques Avancees
Proceedings of the 4th Asia Symposium on Quality Electronic Design, ASQED 2012 | Year: 2012

The paper proposes an FPGA-like approach to on-chip communication and comes up with a design methodology where switches are avoided and where two any IPs are connected if and only if they are communicating. It avoids the problem of costly (time, area, energy) intermediate hop counts of on-chip networks (NOCs) between any two source-destination pairs. The second novelty is that without knowing the overlap/disjointness of communication packets between any two IP blocks, a designer may use unnecessary resources (wasting time, space, energy, resources, etc). So, we look into the temporal aspect of communication and then it is possible that some communication phases don't overlap, thus a designer needs not provision resources for such cases. Based on this methodology, our CAD tool aims at designing NOCs subject to bandwidth, area and energy constraints. © 2012 IEEE. Source

Ghanem K.,Algerian Center de Developpement des Techniques Avancees
IEEE Transactions on Antennas and Propagation | Year: 2013

The channel capacity in body channels is of great importance since it determines the amount and type of data that can be transmitted using the body as a media for communication. In this communication, the average capacity of body-to-body channels, where the transmitter and the receiver are on different human bodies, is investigated in an indoor wireless environment when using multiple antennas at the transmitter and the receiver, the so-calledMIMO system. Different types of antennas are studied, namely PIFA, inverted IFA and monopole antennas, and the capacity in these channels is compared to on-body case. The impingement of the spatial correlation due to the presence of a high line of sight (LOS) component, on the average capacity is also studied. The effect of path loss on average capacity is asserted as well. © 2013 IEEE. Source

Oudjida A.K.,Algerian Center de Developpement des Techniques Avancees | Chaillet N.,University of Franche Comte
IEEE Transactions on Circuits and Systems II: Express Briefs | Year: 2014

In this brief, radix-2r arithmetic is explored to minimize the number of additions in the multiplication by a constant. We provide the formal proof that, for an N-bit constant, the maximum number of additions using radix-2r is lower than Dimitrov's estimated upper bound 2 N log(N) using the double-base number system (DBNS). In comparison with the canonical signed digit (CSD) and the DBNS, the new radix-2r recoding requires an average of 23.12% and 3.07% less additions for a 64-bit constant, respectively. © 2004-2012 IEEE. Source

Mahdoum A.,Algerian Center de Developpement des Techniques Avancees
Computers and Electrical Engineering | Year: 2012

This paper looks at the highest design level and presents a methodology for designing Systems On Chip (SOC) with low energy dissipation. The aim is achieved through a functional decomposition of the system, followed by an appropriate allocation of tasks to the different components of the system (ASICs and processors). With our approach, it is possible to generate architectures with different features (time and energy), which allows the designer to fastly obtain the architecture that best suits his application. © 2012 Elsevier Ltd. All rights reserved. Source

Djani H.,Algerian Center de Developpement des Techniques Avancees | Hermet P.,Charles Gerhardt Institute | Ghosez P.,University of Liege
Journal of Physical Chemistry C | Year: 2014

The structural, dielectric, dynamical, elastic, piezoelectric, and nonlinear optical (second-order susceptibility and Pockels tensors) properties of Bi2WO6 in its P21ab ferroelectric ground state are determined using density functional theory. The calculation of infrared and Raman spectra allowed us to clarify the assignment of experimental phonon modes. The calculation of the elastic constants confirms the elastic stability of the crystal and allows us to estimate the Young and shear moduli of polycrystalline samples. The piezoelectric constants have significant intrinsic values comparable to those of prototypical ABO3 ferroelectrics. The electro-optic response is strongly dominated by the ionic contribution of transverse optic modes, yielding a sizable Pockels coefficients around 9 pm/V along the polar direction. © 2014 American Chemical Society. Source

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