Abstract We develop an inflationary model without small parameters on the basis of multidimensional f ( R ) gravity with a minimally coupled scalar field. The is described by two stages space expansion. first one begins at energy scales about D-dimensional Planck mass and ends de Sitter metric our maximally symmetric extra dimensions. In following, quantum fluctuations produce wide set inhomoge...

Ultrahigh-speed tuning of an extended-cavity semiconductor laser is demonstrated. The laser resonator comprises a unidirectional fiber-optic ring, a semiconductor optical amplifier as the gain medium, and a novel scanning filter based on a polygonal scanner. Variable tuning rates up to 1150 nm/ms (15.7-kHz repetition frequency) are demonstrated over a 70-nm wavelength span centered at 1.32 micr...

Abstract: Urban canyon is categorized as hard environment for positioning of a dynamic vehicle due to low number and also bad configuration of in-view satellites. In this paper, a tuning procedure is proposed to adjust the important factors in Kalman Filter (KF) using Genetic Algorithm (GA). The authors tested the algorithm on a dynamic vehicle in an urban canyon with hard condition and compare...

Abstract: Kalman filter is a well known adaptive filtering Algorithm, widely used for target tracking applications. When the system model and measurements are non linear, variation of Kalman filter like extended Kalman filter (EKF) is used. For obtaining reliable estimate of the target state, filter has to be tuned before the operation (off line).Tuning an EKF is the process of estimation of th...

Kalman filter is a well known adaptive filtering Algorithm, widely used for target tracking applications. When the system model and measurements are non linear, variation of Kalman filter like extended Kalman filter (EKF) and Unscented Kalman filters (UKF) are used. For obtaining reliable estimate of the target state, filter has to be tuned before the operation (off line).Tuning an UKF is the p...

Project Abstract : Direct-Conversion is an alternative wireless transceiver architecture to the well-established super heterodyne, particularly for highly integrated, low power terminals. Direct-Conversion transceivers suffer from the imbalance of the I and Q paths. By using a complex low-pass filter topology instead of a conventional pair of real low-pass filters, this imperfection can be redu...

To correct the frequency response of an integrated filter for process and temperature variations, tuning of the cut-off frequency [l] (f-tuning) is generally applied. Several filters are also provided with automatic tuning of the quality factors (Q-tuning) [2]. Combined fand Q-tuning can be applied with either a master VCF [2] (Voltage Controlled Filter). or a master VCO [3] (Voltage Controlled...

Hybrid method for estimation of fuzzy model parameters is presented. The main idea of the method is to apply gradient descent method or Kalman filter as a mutation operator of genetic algorithm for estimation of antecedent parameters of fuzzy “IF-THEN” rules. Thus, part of the individuals in the population mutate by means of gradient descent method or Kalman filter, the others mutate in an ordi...

A noise reduction scheme, particularly suited for the correction of vocal pathologies, is proposed. The filter makes use of concepts originated within the theory of dynamical systems and deterministic chaos. In particular, the idea of embedding scalar data in order to reconstruct a phase space is of fundamental importance here. Furthermore, the concept of an attractor as a result of dynamical c...

A cache replacement policy is normally suited to a particular class of applications, or limited to a set of fixed criteria for evaluating the cache-worthiness of an object. We present Universal Caching as a mechanism to capture the generality of the most adaptive algorithms, while depending on a very limited set of basic criteria for cache-replacement decisions. Our testing was limited to Web w...