Query : Spectre de fréquences.
- Aulagnier, S.1
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Cross-layer framework for interference avoidance in cognitive radio ad-hoc networks
A fixed spectrum assignment scheme has a problem with resource deficiency in a wireless network. In 2002, the US Federal Communication Commission (FCC) reported that the radio spectrum was 20% to 85% under-utilized. The insufficient use of the spectrum is a critical issue for radio communication; as...
Face recognition using infrared vision
Over the course of the last decade, infrared (IR) and particularly thermal IR imaging based face recognition has emerged as a promising complement to conventional, visible spectrum based approaches which continue to struggle when applied in the real world. While inherently insensitive to visible spe...
Supporting the development of communication skills of children with AST with a non-humanoid robot
Studies on interactions between robots and children with Trouble Autistic Spectrum (ASD) have developed considerably since the late 1990s. However, these studies have several features that prevent generalisation and limit their scope: (a) they are usually carried out in a laboratory and not in a cla...
Fast boundary element formulations for electromagnetic modelling in biological tissues
This thesis presents several new techniques for rapidly converging boundary element solutions of electromagnetic problems. A special focus has been given to formulations that are relevant for electromagnetic solutions in biological tissues both at low and high frequencies. More specifically, as pert...
Feedback on automatic detection of metaphores in Geography texts
National audience If research on metaphores in Geography is not new, there is no major study on this issue. However, existing qualitative research and reflections on small corpus have shown that metaphores are a particularly interesting entry to reflect on the science of the Geogra-phia. In the cont...
Should we question how we develop the Canadian Boreal Forest?
over the last decade we have seen a growing interest in forest planning based on understanding the historical dynamics of natural disturbances. Such planning, focusing on the development of stands and landscapes similar to those of natural environments, should promote the maintenance of biological d...
Seasonal variation of the diet of the Fennec fox, Vulpes zerda (Canidae, Carnivora), in Algeria
International audience The seasonal diet of the Fennec fox, Vulpes zerda, has been investigated in Ben Ahmed, Ghardaïa region (northern Sahara, Algeria) using scat content analysis. In 130 scats collected from autumn 2010 to spring 2011 we identified 726 animal prey items belonging to 17 orders, 30...
Spectral analysis and numerical simulation of cavities containing a negative material
This thesis achieves a theoretical and numerical studies of cavities partially filled with a negative material, that is a material for which the magnetic permeability and/or the electric permittivity (or at least their real part) become negative in some frequency ranges. This study is part of the ma...
Conception and realization of an indoor multi-user Light-Fidelity link
Nowadays, the number of connected devices requiring access to mobile data is considerably increasing. The arrival of even more connected multimedia objects and the growing demand for more information per device highlighted the limits of the fourth generation of broadband cellular networks (4G). This...
Relations between modem pollen rain and vegetation in the Sierra de Guadarrama (Madrid, Spain)
(1) The pollen analysis of surface samples collected along transects which crossing several zonal and non-zonal ecosystems through the mountain pass of Navafiria, in the Sierra de Guadarrama (Madrid, Spain), permit to establish relationships between modem sporal-pollen rain and vegetation. (2) The d...
Resources Allocation for Dynamic Spectrum Management in Clustered Ad hoc Networks
This thesis deals with the fully distributed allocation of channels in clustered ad hoc networks. Nodes are gathered locally into clusters in order to keep the advantage of the no infrastructure of ad hoc networks, and to reduce the amount of signalling. In each cluster a node is elected as the Clus...
An economic analysis of the shared use of spectrum
This thesis aims at analyzing the impact of dynamic spectrum sharing on the ways in which spectrum resources are assigned and valued. The physical, technical and economic characteristics of radioelectric frequencies make national and international coordination and planning of spectrum necessary. Bel...
Coal assemblies in ‘concentrated’ deposits: a new calculation method to improve their representativeness of burned wood
for a long time, the paleoecological representativeness of domestic fuel coal is no longer a matter of debate, provided that the removal of fragments dispersed in habitat levels has taken place over a fairly long period of time. On the contrary, coal from concentrated deposits representing a shorter...
Contribution to the study of combustion instabilities in cryotechnic rocket engines : coupling diffuse interface models with kinetic-based moment methods for primary atomization simulations
Gatekeepers to the open space, launchers are subject to intense and competitive enhancements, through experimental and numerical test campaigns. Predictive numerical simulations have become mandatory to increase our understanding of the physics. Adjustable, they provide early-stage optimization proc...
From grain to music From grain to music: real-time manipulation
In this article we will present a comparative study of some signal manipulation techniques such as the Fourier Short Term Transformation, the Asynchronchrone granular Synthesis and PSOLA, in particular in the context of their real-time use. We will briefly present the functioning of these three meth...
Chapter 4. Low hand on the wireless — and on the physical layer
I have a colour poster on the wall of my office. Quite large (approximately 100 x 75), he is entitled, in a very beautiful antan typewriter police, ‘United States Frequency Allocations — The Radio Spectrum’. On the left, there are 33 coloured boxes listing the names. Thirty of these boxes list ‘radi...