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A particular meshless method, named meshless local Petrov – Galerkin is investigated. To treat the essential boundary condition problem, an alternative approach is proposed. The basic idea is to merge the best features of two different methods of shape function generation: the moving least squares (MLS) and the radial basis functions with polynomial terms… (More)
This paper presents a new approach for automatic graph drawing based on <i>Genetic algorithms</i>. The classical <i>topology-shape-metric</i> approach for orthogonal graph drawing keeps a fixed planar embedding obtained in its first step (<i>planarization</i>), using it for the next two steps (<i>orthogonalization</i> and <i>compaction</i>). However, each… (More)
Keywords: Graph drawing Genetic algorithms Combinatorial optimization Multicriteria decision making in a fuzzy environment a b s t r a c t This paper reflects results of research related to developing a new methodology for automatic graph drawing based on applying genetic algorithms. The methodology has permitted the elaboration of a hybrid technique that… (More)
— Slivers are tetrahedra whose four vertices are almost coplanar, thus not suitable to use in finite element computations. Recent theoretical advances reported in the computational geometry field inspired an implementation of the sliver exudation method. This article aims to report our experience using this method to improve 3D meshes.
We present a multiobjective hybrid technique for automatic orthogonal graph drawing. The new methodology combines the classical approach to automatic orthogonal graph drawings,the topology-shape-metric approach, and a multiobjective genetic algorithm based on the NSGA-II method. In the topology-shape-metric method, a fixed planar embedding is obtained in… (More)
Cirrhotic patients (23 with alcoholic cirrhosis, 5 with posthepatitic cirrhosis and 2 with cryptogenic cirrhosis) with ascites and portal hypertension were studied and divided into two groups corresponding to high or low risk to develop spontaneous bacterial peritonitis (SBP) related to the concentration of total protein in the ascitic fluid (A-TP): group I… (More)
An approach to compute the H 2-or H 1-guaranteed costs with any prescribed accuracy is presented. The proposed approach can be applied to uncertain state–space models of linear time-invariant systems, where the system matrices depend on uncertain parameters or vary in a polytopic domain of the space of matrices. The developed approach is based on a new… (More)