11,716 research outputs found
On chip interconnects for multiprocessor turbo decoding architectures
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Genetic algorithm approach to find the best input variable partitioning
Conference PaperThis paper presents a variable partition algorithm which combines the quasi-reduced ordered multiple-terminal multiple-valued decision diagrams and genetic algorithms (GAs). The algorithm is better than the previous techniques which find a good functional decomposition by non-exhaustive search and expands the range of searching for the best decomposition providing the optimal subtable multiplicity. The possible solutions are evaluated using the gain of decomposition for a multiple-output multiple-valued logic function. The distinct feature of GA is the possible solutions being coded by real numbers. Here the simplex-based crossover is proposed to use for the recombination stage of GA. It permits to increase the GA coverag
Simulation of Gegenbauer Processes using Wavelet Packets
In this paper, we study the synthesis of Gegenbauer processes using the
wavelet packets transform. In order to simulate a 1-factor Gegenbauer process,
we introduce an original algorithm, inspired by the one proposed by Coifman and
Wickerhauser [1], to adaptively search for the best-ortho-basis in the wavelet
packet library where the covariance matrix of the transformed process is nearly
diagonal. Our method clearly outperforms the one recently proposed by [2], is
very fast, does not depend on the wavelet choice, and is not very sensitive to
the length of the time series. From these first results we propose an algorithm
to build bases to simulate k-factor Gegenbauer processes. Given its practical
simplicity, we feel the general practitioner will be attracted to our
simulator. Finally we evaluate the approximation due to the fact that we
consider the wavelet packet coefficients as uncorrelated. An empirical study is
carried out which supports our results
Computational methods and software systems for dynamics and control of large space structures
Two key areas of crucial importance to the computer-based simulation of large space structures are discussed. The first area involves multibody dynamics (MBD) of flexible space structures, with applications directed to deployment, construction, and maneuvering. The second area deals with advanced software systems, with emphasis on parallel processing. The latest research thrust in the second area involves massively parallel computers
Parallel computations and control of adaptive structures
The equations of motion for structures with adaptive elements for vibration control are presented for parallel computations to be used as a software package for real-time control of flexible space structures. A brief introduction of the state-of-the-art parallel computational capability is also presented. Time marching strategies are developed for an effective use of massive parallel mapping, partitioning, and the necessary arithmetic operations. An example is offered for the simulation of control-structure interaction on a parallel computer and the impact of the approach presented for applications in other disciplines than aerospace industry is assessed
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