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José A. Díaz-García José Ramón Domínguez-Molina 《Computational statistics & data analysis》2007,51(12):5927-5939
One of the biggest problems in reliability analysis is determining an appropriate distribution of life data. Therefore, this paper develops the estimation aspect of a family of life distributions obtained from spherical distributions. Additionally, a new family of life distributions is proposed for dependent life data, together with an optimization algorithm based on the simulated annealing method. This algorithm is very efficient for optimization purposes and does not require any manipulation of the log-likelihood functions for the distributions proposed in this study. 相似文献
425.
T. TixierPh. Tordjeman 《Polymer》2003,44(22):6937-6942
Five model polydimethylsiloxane (PDMS) networks were obtained by hydrosilation of a difunctional vinyl-terminated PDMS prepolymer with a SiH containing crosslinker. Viscoelastic experiments were performed in order to study the influence of molecular parameters on the dynamic properties at the sol-gel threshold. The results suggest that the critical exponents are not universal and depend on the chemical structure of the incipient gels. They show that the fractal dimension calculated from the rheological data in the framework of the viscoelastic mean field theory, is a decreasing function of the ratio functionality/molecular weight of the crosslinker. 相似文献
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Any two objects A and B can be viewed as two different projections of their Cartesian product A×B. Rotating and projecting A×B results in a continuous transformation of A into B. During certain rotations, the contour of the Cartesian product remains the same although its projection changes. Based on
these properties, we derive a fast and simple morphing algorithm without topological constraints on either object. 相似文献
428.
F. Sezgin 《Computing》2006,78(2):173-193
We discuss the lattice structure of congruential random number generators and examine figures of merit. Distribution properties
of lattice measures in various dimensions are demonstrated by using large numerical data. Systematic search methods are introduced
to diagnose multiplier areas exhibiting good, bad and worst lattice structures. We present two formulae to express multipliers producing worst and bad laice points. The conventional
criterion of normalised lattice rule is also questioned and it is shown that this measure used with a fixed threshold is not
suitable for an effective discrimination of lattice structures. Usage of percentiles represents different dimensions in a
fair fashion and provides consistency for different figures of merits. 相似文献
429.
The Kovacic algorithm and its improvements give explicit formulae for the Liouvillian solutions of second order linear differential equations. Algorithms for third order differential equations also exist, but the tools they use are more sophisticated and the computations more involved. In this paper we refine parts of the algorithm to find Liouvillian solutions of third order equations. We show that, except for four finite groups and a reduction to the second order case, it is possible to give a formula in the imprimitive case. We also give necessary conditions and several simplifications for the computation of the minimal polynomial for the remaining finite set of finite groups (or any known finite group) by extracting ramification information from the character table. Several examples have been constructed, illustrating the possibilities and limitations. 相似文献
430.
d +1 variables over finite fields to scatter points on the surface of the unit sphere S
d
, dX05;1. Applications are given for spherical t designs and generalized s energies.
Received May 2, 2001; revised October 2, 2001 Published online February 18, 2002 相似文献