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— The development of search engine for similar images stays yet a scientific challenge. Since every image is represented by one or more vectors, the research stage becomes very hard. To raise these difficulties, we suggest inserting a search engine based on multiple representations of images where every image will be represented by three vectors that are(More)
under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract In this paper, we give an a posteriori error estimates with constitutive law for some obstacle problem. The error estimator involves some parameter ε appeared in some penalized(More)
A two-dimensional Stefan problem is usually introduced as a model of solidifi-cation, melting or sublimation phenomena. The two-phase Stefan problem has been studied as a direct problem, where the free boundary separating the two regions is eliminated using a variational inequality In the present work, we provide a new formulation leading to a shape(More)