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This paper presents some optimizations based on communications/computations overlap for the ScaLAPACK LU factorization. First a theoretical computation of the optimal block size is given for the block scattered decomposition of the matrix. Two optimizations of this routine are presented that use asynchronous communications to hide the communication overhead and to obtain optimal speed-ups.
In view of qualitative temperature measurement by scanning thermal microscopy, we introduce a model-based control law for a new microfabricated probe. The underlying model is the time-space two-scale electro-thermal model presented in [15], since it has the power to represent transcients of harmonic modulations. The control method accounts for an estimation of the heat source in the sample and for...
In this paper, our attention is focused on a two-scale model based algorithm for deflection estimation of array of Atomic force microscopes (AFM) in quasi-static regime by interferometry. In a previous work, an algorithm based on three measurements by cantilever was introduced to compute their displacements in quasi-static regime. Here, we propose an improvement so that two measurements only are required...
In this paper, we present new tools and results developed for Arrays of Microsystems and especially for Atomic Force Microscope (AFM) array design. For modeling, we developed a two-scale model of cantilever arrays in elasto dynamics. A robust optimization toolbox is interfaced to aid for design before the micro fabrication process. A model based algorithm of static state estimation using measurement...
In this paper, we present new tools and results developed for Arrays of Microsystems and especially for Atomic Force Microscope (AFM) array design. For modeling, we developed a two-scale model of cantilever arrays in elastodynamics. A robust optimization toolbox is interfaced to aid for design before the microfabrication process. A model based algorithm of static state estimation using measurement...
This paper presents CRAC, an environment dedicated to design efficient asynchronous iterative algorithms for a grid architecture. Those algorithms are particularly suited for grid architecture since they naturally allow to overlap communications by computations. Each processor computes its iterations freely without any synchronization with its neighbors. All the characteristics of CRAC are described...
Java is often criticized for its poor performances compared to native codes. Nevertheless, this language provides lots of interesting functionalities to easily implement scientific applications on a widely distributed architecture (i.e. grid). The context of this paper is that of iterative algorithms. In order to increase the efficiency of the code, we suggest to use a special class of algorithms...
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