We present a numerically fast reduced filtering strategy, the Fourier domain Kalman filter with appropriate interpolations to account for irregularly spaced observations of complex turbulent signals. The design of such a reduced filter involves: (i) interpolating irregularly spaced observations to the model regularly spaced grid points, (ii) understanding under which situation the small scale o...

Accurate modeling of dynamical systems can lead to large-scale systems of ordinary differential equations. For many applications, these systems additionally depend on parameters, which, for example, describe geometric attributes. In order to be able to perform tasks such as optimization, simulation or control, it is necessary to reduce the computational effort of solving the system. For that re...

In this paper, quadratic and sextic B-splines are used to construct an approximating function based on the integral values instead of the function values at the knots. This process due to the type of used B-splines (fourth order or sixth order), called integro quadratic or sextic spline interpolation. After introducing the integro quartic and sextic B-spline interpolation, their convergence is ...

As a special micro-motion feature of rotor targets, rotational angular velocity can provide discriminant basis for target classification and recognition. In this paper, an adaptive accurate method is proposed estimating the targets via Fourier coefficient interpolation algorithm that based on modified frequency index residue initialization. The negative complex exponential signal component remo...

The volume contains prominent information used to evaluate the visual quality of natural products and can be measured using a computer vision system. system provides an alternative method for measuring products, especially axi-symmetric products. obtained integral solid revolution by rotating boundary curve upper half object cross-section. This study proposes based on cubic spline interpolation...

[1] We present a hybrid method for the numerical solution of advection-diffusion problems that combines two standard algorithms: semi-Lagrangian schemes for hyperbolic advection-reaction problems and CrankNicolson schemes for purely diffusive problems. We show that the hybrid scheme is identical to the two end-member schemes in the limit of infinite and zero Peclet number and remains accurate o...

In this article we give a survey of the current practice and state-of-theart of recommender services in scientific digital libraries. With the notable exception of amazon.com and CiteSeer which do not qualify as proper scientific libraries our survey revealed that in scientific libraries recommender services are still not in wide use – despite the considerable benefits they offer for students a...

Abstract To improve the imaging quality of wide-azimuth seismic data and enhance uniformity attributes between adjacent bins, we developed a novel interpolation method in offset-vector tiles (OVT) domain for data. The orthogonal matching pursuit (OMP) based on Fourier transform is frequency-domain processing technique discrete that achieves goal anti-aliasing by extracting weight factor effecti...