نتایج جستجو برای: quasi wavelet

تعداد نتایج: 121585  

Journal: :journal of linear and topological algebra (jlta) 0
m sha ee-mousavi islamic azad university, south tehran branch

let r be a ring,  be an endomorphism of r and mr be a -rigid module. amodule mr is called quasi-baer if the right annihilator of a principal submodule of r isgenerated by an idempotent. it is shown that an r-module mr is a quasi-baer module if andonly if m[[x]] is a quasi-baer module over the skew power series ring r[[x; ]].

Journal: :SIAM Journal on Scientific Computing 2021

When solving partial differential equations (PDEs) with random fields as coefficients, the efficient sampling of field realizations can be challenging. In this paper we focus on fast Gaussian using quasi-random points in a finite element and multilevel quasi Monte Carlo (MLQMC) setting. Our method uses stochastic PDE (SPDE) approach Lindgren et al. combined new algorithm for white noise which i...

Journal: :iranian journal of medical physics 0
farshid babapour mofrad ph.d., candidate, faculty of engineering, science and research branch, islamic azad university, tehran, iran ali abbaspour tehrani-fard assistant professor, faculty of engineering, science and research branch, islamic azad university, tehran, iran babak ebrahimi m.sc., faculty of engineering, science and research branch, islamic azad university, tehran, iran dariush sardari assistant professor, faculty of engineering, science and research branch, islamic azad university, tehran, iran

introduction: spect is a diagnostic imaging technique the main disadvantage of which is the existence of poisson noise. so far, different methods have been used by scientists to improve spect images. the wavelet transform is a new method for de-noising which is widely used for noise reduction and quality enhancement of images. the purpose of this paper is evaluation of noise reduction in spect ...

2003
Eric Weber M. Fickus Jelena Kovacevic Janet Crandell Tremain

For Gabor sets, (g; a, b), it is known that (g; a, b) is a frame if and only if (g; 1/b, 1/a) is a Riesz basis for its span. In particular, for every g there is a0 such that for every a < a0, there is a bm = bm(a) > 0 so that for every b < bm, (g; a, b) is a frame, and (g; 1/b, 1/a) is a Riesz basis sequence. In this talk we shall consider a similar problem for wavelet sets (Ψ; a, b). The main ...

Ali Abbaspour Tehrani-Fard Babak Ebrahimi Dariush Sardari Farshid Babapour Mofrad,

Introduction: SPECT is a diagnostic imaging technique the main disadvantage of which is the existence of Poisson noise. So far, different methods have been used by scientists to improve SPECT images. The Wavelet Transform is a new method for de-noising which is widely used for noise reduction and quality enhancement of images. The purpose of this paper is evaluation of noise reduction in SPECT ...

Journal: :international journal of advanced biological and biomedical research 2014
abazar solgi feridon radmanesh heidar zarei vahid nourani

awareness of the level of river flow and its fluctuations at different times is one of the significant factor to achieve sustainable development for water resource issues. therefore, the present study two hybrid models, wavelet- adaptive neural fuzzy interference system (wanfis) and wavelet- artificial neural network (wann) are used for flow prediction of gamasyab river (nahavand, hamedan, iran...

زاهدی, مرتضی, یوسف زاده, سعیده,

 Background: Human skin more than any other part of the body, is exposed to the risks of diseases and complications of labor. One of the applications of study on the relationship between skin and diseases is use of fingerprints in the diagnosis and the subsequent treatment of it. We analyzed the fingerprint images of two systematic diseases namely diabetes and addiction. Methods: The f...

Abazar Solgi, Feridon Radmanesh Heidar Zarei Vahid Nourani

Awareness of the level of river flow and its fluctuations at different times is one of the significant factor to achieve sustainable development for water resource issues. Therefore, the present study two hybrid models, Wavelet- Adaptive Neural Fuzzy Interference System (WANFIS) and Wavelet- Artificial Neural Network (WANN) are used for flow prediction of Gamasyab River (Nahavand, Hamedan, Iran...

Journal: :J. Systems Science & Complexity 2007
Paolo Mercorelli

New industrial applications call for new methods and new ideas in signal analysis. Wavelet packets are new tools in industrial applications and they have just recently appeared in projects and patents. In training neural networks, for the sake of dimensionality and of ratio of time, compact information is needed. This paper deals with simultaneous noise suppression and signal compression of qua...

Journal: :journal of algebraic systems 2014
mahmood behboodi reza jahani-nezhad mohammad hasan naderi

in this paper we investigate decompositions of submodules in modules over a proufer domain into intersections of quasi-primary and classical quasi-primary submodules. in particular, existence and uniqueness of quasi-primary decompositions in modules over a proufer domain of finite character are proved. proufer domain; primary submodule; quasi-primary submodule; classical quasi-primary; decomposi...

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