نتایج جستجو برای: wavelet function

تعداد نتایج: 1245646  

Journal: :Mathematical Problems in Engineering 2016

In this paper, Wavelet Collocation Method has been used to solve nonlinear fin problem with temperature dependent thermal conductivity and heat transfer coefficient. Thermal conductivity of fin materials varies any type so that we consider thermal conductivity as the general function of temperature.  Here we consider three particular cases, where we assume that thermal conductivity is constant,...

2017
Houda Chakib Brahim Minaoui Mohamed Fakir Abderrahim Salhi Imad Badi

Over the last years, wavelet theory has been used with great success in a wide range of applications as signal denoising and image compression. An ideal image compression system must yield high-quality compressed image with high compression ratio. This paper attempts to find the most useful wavelet function to compress an image among the existing members of wavelet families. Our idea is that a ...

1997
Chien-Chih Chen Tom Chen

In this paper, we present a wavelet transform based coding approach by employing modiied rate-distortion function and hybrid optimum classiication. In the proposed approach, each upper band subimage from wavelet decomposition is optimally classiied to achieve the minimum quantization error, according to an eecient prediction model and a modiied rate-distortion function. The performance of the a...

2012
Andrzej Klepka

Diagnostics of rolling elements under varying operational conditions, where disturbances and other rotating elements have strong influence on correctness of analysis, requires engagement of advanced signal processing techniques. Extraction of signal components generated by bearing faults has been proven to be an exceptionally promising method for rolling element bearing fault detection. In this...

1994
Debao Chen

In both applications and wavelet theory, the spline wavelets are especially interesting, in part because of their simple structure. In a previous paper we proved that the function m;l is an m th order spline wavelet having an l th order spline dual wavelet. This enabled us to derive biorthogonal spline wavelet bases. In this paper we rst study the general structure of cardinal spline wavelets, ...

2011
Yaoqun Xu Xueling Yang

A Chaotic neural network model with Morlet wavelet function selffeedback is proposed by introducing Morlet wavelet function into self-feedback of chaotic neural network. The analyses of the optimization mechanism of the networks suggest that Morlet wavelet function self-feedback affects the original Hopfield energy function in the manner of the sum of the multiplications of Morlet wavelet funct...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم ریاضی 1388

چکیده ندارد.

Journal: :فیزیک زمین و فضا 0
جلیل ناصری کارشناس ارشد ژئوفیزیک، شرکت eni حمیدرضا سیاهکوهی دانشیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران، ایران

in seismic exploration studies different types of techniques are used to recognize seismic features in terms of their temporal and spatial spectra. variations in frequency content are sensitive to subtle changes in reflection information (castro de matos et al., 2003). in this study the joint time-frequency analysis is used for seismic texture recognition. discrete wavelet transform (dwt) witho...

Journal: :IJWMIP 2013
A. San Antolín R. A. Zalik

We construct smooth nonseparable compactly supported refinable functions that generate multiresolution analyses on L2(R), d > 1. Using these refinable functions we construct smooth nonseparable compactly supported orthonormal wavelet systems. These systems are nonseparable, in the sense that none of its constituent functions can be expressed as the product of two functions defined on lower dime...

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