Stability of Dissipative Optical Solitons in the 2D Complex Swift-Hohenberg Equation

International audienceThis article deals with stationary localized solutions of the (2D) two-dimensional complex Swift-Hohenberg equation (CSHE). Our approach is based on the semi-analytical method of collective coordinate approach. According to the parameters of the equation and a suitable choice of ansatz, the stationary dissipative solitons of the 2D CSHE equation are mapped. This approach allows to describe the influence of the parameters of the equation on the various physical parameters of the pulse and their dynamics. Finally, the major impact of spectral filtering terms on the dynamic of the solitons is demonstrated

Performance of a New Method of Multicomponent Images Segmentation in the Presence of Noise

Any undesirable signal limiting to a degree or another the integrity and the intelligibility of a useful signal can be considered as noise. In the general rule, the good performance of a system is assured only if the level of power of the useful signal exceeds by several orders of magnitude that of the noise (signal to noise of a several tens of decibels). However certain elaborate methods of treatment allow working with very low sig- nal to noise ratio in an optimal way any a priori knowledge available on the signal useful to interpret. In this work, we evaluate the robustness of the noise on a new method of multicomponent image segmentation de- veloped recently. Two types of additional noises are considered, which are the Gaussian noise and the uni- form noise, with varying correlation between the different components (or planes) of the image. Quantitative results show the influence of the noise level on the segmentation method

An industrializable Silicon-based microhotplate for metal oxides gas sensors

International audienceThis article presents an industrializable silicon-based microhotplate for metal oxide gas sensors. It introduces an interesting approach and describes the technological optimizations used to reach high and stable operating temperature, in reducing intrinsic drift problems (due to commercial polysilicon heater). The microhotplate present low consumption of 70 mW for 600°C, good thermal homogeneity over the active area and a good mechanical stability

An efficient nanoparticles- SnO2 gas sensor for industrial applications

International audienceThe sensor presented in this article consists of a nanostructured tin oxide as high sensitive material and an efficient high temperature microhotplate. Tin oxide nanoparticles are in suspension in a solvent (colloidal solution) and then are deposited by contactless methods such as microinjection on a new efficient microhotplate. The microhotplate has been developed with high electrical and mechanical stabilities up to 650°C with a low power of consumption (< 80mW) and allows an efficient control of temperature, useful for detection of gases. In this work, the gas sensor developed is exposed to different polluting gases like carbon monoxide, propane and nitrogen dioxide at different temperatures to determine the optimum operating temperatures which P. Yoboue, A. Konaté, O. Asseu, P. Tety and P. Ménini 42 allow obtaining the highest sensitivity for each gas. It is also demonstrated that these gas sensors present a better sensitivity and above all a better stability compared to commercial metal oxide gas sensors

Building An Automated Gesture Imitation Game For Teenagers with ASD

International audienceAutism spectrum disorder is a neurodevelopmental condition that includes issues with communication and social interactions. People with ASD also often have restricted interests and repetitive behaviors. In this paper we build preliminary bricks of an automated gesture imitation game that will aim at improving social interactions with teenagers with ASD. The structure of the game is presented, as well as support tools and methods for skeleton detection and imitation learning. The game shall later be implemented using an interactive robot

Robust decoupling controland extended sliding mode observer for an induction motor

ISSN 1114-3800International audienceThis paper presents a feedback linearization strategy and a robust controller to permit a decoupling and regulation of the motor states in order to assure a good dynamic performance and stability of the global system. As the control required the knowledge of the instantaneous flux of the rotor and the rotor parameter estimation can improve the control quality, a fifth-order discrete-time extended sliding mode observer is proposed for on-line estimation of rotor fluxes and rotor time constant. The simulation and experimental results for a 5.5 kW induction motor are presented to illustrate the validity and the high robustness of the proposed approach against parameter variations and disturbances