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Marques O.,Florida Atlantic University | Barenholtz E.,Florida Atlantic University | Charvillat V.,ENSEEIHT
Multimedia Tools and Applications | Year: 2011

In recent years there has been a surge of interest in context modeling for numerous applications in computer vision. The basic motivation behind these diverse efforts is generally the same-attempting to enhance current image analysis technologies by incorporating information from outside the target object, including scene analysis as well as metadata. However, many different approaches and applications have been proposed, leading to a somewhat inchoate literature that can be difficult to navigate. The current paper provides a 'roadmap' of this new research, including a discussion of the basic motivation behind context-modeling, an overview of the most representative techniques, and a discussion of specific applications in which contextual modeling has been incorporated. This review is intended to introduce researchers in computer vision and image analysis to this increasingly important field as well as provide a reference for those who may wish to incorporate context modeling in their own work. © 2010 Springer Science+Business Media, LLC.

Power H.,University of Nottingham | Soavi J.,ENSEEIHT | Kantachuvesiri P.,University of Nottingham | Nieto C.,Pontifical Bolivarian University
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2015

In this work, a detailed study of the effect of the Thompson and Troian’s nonlinear slip condition on the flow behaviour of a Newtonian incompressible fluid between two concentric rotating cylinders (Couette flow) is considered. In Thompson and Troian’s nonlinear condition, the slip length on the Navier slip condition is considered to be a function of the tangential shear rate at the solid surface instead of being a constant. The resulting formulation presents an apparent singularity on the slip length when a critical shear rate is approached. By considering this type of nonlinear slip condition, it is possible to predict complex characteristics of the flow field not previously reported in the literature, and to show the effect of nonlinear slip on the inverted velocity profiles previously observed in the linear slip case. Particular attention is given to the behaviour of the flow field near the critical shear rate. In such a limit, it is found that the flow field tends to slip flow with a finite slip length. Consequently, previous critique on the singular behaviour of Thompson and Troian’s nonlinear model is not valid in the present case. © 2015, Springer Basel.

Gratton S.,ENSEEIHT | Toint P.L.,University of Namur | Troltzsch A.,European Center for Research and Advanced Training in Scientific Computation
Optimization Methods and Software | Year: 2011

We consider an implementation of a recursive model-based active-set trust-region method for solving bound-constrained nonlinear non-convex optimization problems without derivatives using the technique of self-correcting geometry proposed in K. Scheinberg and Ph.L. Toint [Self-correcting geometry in model-based algorithms for derivative-free unconstrained optimization. SIAM Journal on Optimization, (to appear), 2010]. Considering an active-set method in bound-constrained model-based optimization creates the opportunity of saving a substantial amount of function evaluations. It allows US to maintain much smaller interpolation sets while proceeding optimization in lower-dimensional subspaces. The resulting algorithm is shown to be numerically competitive. © 2011 Taylor & Francis.

Fernandez-Prieto A.,University of Seville | Bhatker J.,ENSEEIHT | Lujambio A.,Skylife Engineering | Martel J.,ETSA | And 2 more authors.
Electronics Letters | Year: 2016

A novel balanced differential bandpass filter implemented in coplanar waveguide (CPW) technology is presented. The filter is based on the use of two magnetically coupled CPWfolded-stepped impedance resonators. The use of magnetic coupling, instead of the more common electric coupling, provides inherent common-mode rejection. Measured and simulated results demonstrate the benefits of the proposed balanced filter. © 2016 The Institution of Engineering and Technology.

Dakhli N.,Research Unit of Telecommunication Systems 6Tel at supCom | Choubani F.,Research Unit of Telecommunication Systems 6Tel at supCom | David J.,ENSEEIHT
Applied Physics A: Materials Science and Processing | Year: 2011

A novel resonant metamaterial antenna based on the Composite Right/Left-Handed (CRLH) transmission line (TL) model is presented. The proposed small antenna is designed to operate simultaneously over multiple wireless services (UMTS-WLAN-WIMAX) © 2011 Springer-Verlag.

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