Concept

Isotropic quadratic form

Related publications (42)

SURE-LET interscale-intercolor wavelet thresholding for color image denoising - art. no. 67011H

We propose a new orthonormal wavelet thresholding algorithm for denoising color images that are assumed to be corrupted by additive Gaussian white noise of known intercolor covariance matrix. The proposed wavelet denoiser consists of a linear expansion of ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2007

Control and Optimization Methods for Traffic Signal Control in Large-scale Congested Urban Road Networks

he problem of designing real-time traffic signal control strategies for large-scale congested urban road networks via suitable application of control and optimization methods is considered. Three alternative methodologies are proposed, all based on the sto ...

IEEE2007

A New Quadratic, Three-Level, DC/DC Converter Suitable for Fuel Cell Applications

Alfred Rufer

This paper presents a new non-insulated quadratic three-level DC-DC boost converter. The quadratic feature is interesting for application where a wide voltage range is necessary. Since it is a current-source converter, its application in a fuel cell energy ...

2007

Optimal water allocation for an alpine hydropower system under changing scenarios

Paolo Perona

The operating rules of water allocation in the alpine OFIMA hydropower network of the Maggia River basin (Canton Tessin, Switzerland) are investigated in response to changes in the production policy and environmental and climatic factors. The study was car ...

Springer Verlag2006

Sensitivity Analysis and Optimization of a Standing Wave Ultrasonic Linear Motor

Yves Perriard, José Fernandez Lopez

This paper presents the sensitivity analysis of an ultrasonic linear motor using design of experiments (DOE) and the finite element (FE) optimization of its deformation amplitude. A first ultrasonic linear motor prototype has been built at the laboratory. ...

2006

Solving the fixed rank convex quadratic maximization in binary variables by a parallel zonotope construction algorithm

Thomas Liebling, Jean-Albert Ferrez

We address the weighted max-cut problem, or equivalently the problem of maximizing a quadratic form in n binary variables. If the underlying (symmetric) matrix is positive semidefinite of fixed rank d, then the problem can be reduced to searching the extre ...

2004

Anneau de Witt des G-formes et multiples de G-formes trace

Philippe Chabloz

This thesis deals with the study of G-forms and particulary the trace form of a G-Galois algebra. Let k be a field of characteristic not two. Let G be a finite group and L a G-Galois algebra over k. We define the trace form qL by qL(x, y) = TrL/k(xy) for a ...

EPFL2004

Bimodal Myocardial Motion Analysis from B-Mode and Tissue Doppler Ultrasound

Michaël Unser, Michael Sühling, Muthuvel Arigovindan

We present a new method for estimating heart motion from two-dimensional echocardiographic sequences by exploiting two ultrasound modalities: B-mode and tissue Doppler. The algorithmestimates a two-dimensional velocity field locally by using a spatial affi ...

IEEE2004

A New Approach in Deterministic Global Optimisation of Problems with Ordinary Differential Equations

Benoît Chachuat

This paper presents an alternative approach to the deterministic global optimisation of problems with ordinary differential equations in the constraints. The algorithm uses a spatial branch-and-bound approach and a novel procedure to build convex underesti ...

Kluwer Academic Publishers2003

Stability analysis of discrete-time switched systems through Lyapunov functions with nonminimal state

Giancarlo Ferrari Trecate

In this paper we investigate stability analysis for discrete-time switched systems. We first consider quadratic Lyapunov functions defined over a nonminimal state encompassing the past history of the state trajectory over a finite horizon. This allows us t ...

2003

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