E-Journal Universitas Muhammadiyah Gorontalo
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3D Geometrical Features of Anatomic Structures : the Example of the Ulna and Radius Bone
No full textInternational audienceThis paper addresses two important issues of three-dimensional (3D) natural shape analysis. The first concerns the segmentation of these shapes into 3D primitives and the second deals with their geometric characterisation by means of intrinsic features. Restricting ourselves to 3D objects formed from two-dimensional (2D) cross-sectional adjacent slices (i.e., long bones), we present a method of contextual classification and results concerning the ulnar bone. With respect to the second issue, a curvature-torsion analysis of the medullar axis is introduced and the results are represented by means of torsion images. A first application to ulnar structures is given. It is shown that radius bones have zero torsion and that their curvatures can be studied in 2D. A preliminary statistical study of the 2D curvature of the radius is also presented
Gadrey Jean, L'économie des services. Gadrey (Jean) et alii, Manager le conseil. Stratégies et relations des consultants et de leurs clients.
No full textInternational audienceno abstrac
Structure at infinity, model matching and disturbance rejection for linear systems with delays
No full textInternational audienceStructure at infinity for systems with delays is introduced here. A generalization of the Smith-McMillan form at infinity is given with an application to the Model Matching and Disturbance Rejection Problems. With the help of some finite dimensional descriptions, a formulation of a Partial Disturbance Rejection Problem is given for systems with delay and necessary and sufficient structural conditions are provided for the existence of a non anticipative state feedback solution to this problem. These conditions are expressed in terms of structures at infinity and directly extend the corresponding result about Exact Disturbance Rejection for classical systems without delay
A Three-Dimensional Primitive Extraction of Long Bones obtained from Fourier Descriptors
No full textInternational audienceWe propose a method for a 3D primitive extraction of long bones using a set of 2D Fourier descriptors. This set is shown to be stable, complete and endowed with geometrical invariancy properties. A polar diagram representation allowing a segmentation of 3D primitives is deduced. The method is illustrated in the case of ulna and radius bones
A geometrical Analysis for a Data Compression of 3D Anatomical Structures
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Une représentation des structures osseuses tridimensionnelles par un diagramme polaire plan de descripteurs de Fourier
No full textNational audienceNous présentons ici une étude sur la description d'objets tridimensionnels définis à partir de coupes parallèles jointives. Une base complète et stable de descripteurs de Fourier de courbes planes est utilisée pour représenter des structures de manière invariante relativement à des transformations géométriques élémentaires 3D. La représentation sous forme de diagramme polaire fournit une description plane et compacte de structures 3D complexes. Elle permet une interprétation visuelle par le médecin qui retrouve les informations morphologiques majeures de la structure entièr
Equation de T.B.M.T et application à l'étude du spin du lambda0.
No full textThe purpose is to determine the spin of the lambda particle studying the varaition of the spin of the particle in a magnetic field within the T.B.M.T equation.Le but est de déterminer le spin du lambda0 en étudiant le mouvement du spin d'une particule placée dans un champ magnétique à l'aide de l'équation de T.B.M.T