Convolution as a Matrix/Vector multiplication Notice that (2) can be written as g = Y x where g is a column vector with elements gk = (x ∗ y)k, x is a column vector with elements xk, and Y is an NxN matrix. By examining (2), we can deduce that the elements of the first row of the matrix Y should be Y0,: = {y0, y−1, y−2, ..., y−(N−1)} Similarly, the second row should be Y1,: = {y1, y0, y−1, ...,...

The recent surge of interests in cognitive assessment has led to developments of novel statistical models for diagnostic classification. Central to many such models is the well-known Q-matrix, which specifies the item-attribute relationships. This article proposes a data-driven approach to identification of the Q-matrix and estimation of related model parameters. A key ingredient is a flexible ...

in this paper occurrences of precipitation in iran was analyzed according to random processes by the applying of markov chain model. in order to do that occurrence and non-occurrence of rainfall of asfezari data base for the period of 1961/3/21 to 2004/12/31 was used. this data are for 7187 pixel and 15991 days. by using markov chain model first order two state dry and wet frequency matrix was ...

A three-dimensional micromechanics-based analytical model is developed to study thermo-mechanical properties of polymer composites reinforced with randomly distributed silica nanoparticles. Two important factors in nanocomposites modeling using micromechanical models are nanoparticle arrangement in matrix and interphase effects. In order to study these cases, representative volume element (RVE)...

background and objectives: one of the simplest and cheapest attachments for overdentures, is the ball-type attachment, however, keeping it during the first year of prosthesis delivery and after that is one of the main concerns of dentists. the present study aimed to assess the wear of matrix in overdentures attachment supported by one, two and three implants in the mandible. materials and metho...

the presence of noise in geophysical measurements has undesirable effects on the seismic data. one of the important problems in seismic data processing is attenuation of the noise to the desired form and keeping the original signal. contamination of seismic data with noise prevents obtaining a proper image of geological structures and seismic data interpretation. in some of the receivers the no...

The objective of this study was to develop a new optimal parallel algorithm for matrix multiplication which could run on a Fibonacci Hypercube structure. Most of the popular algorithms for parallel matrix multiplication can not run on Fibonacci Hypercube structure, therefore giving a method that can be run on all structures especially Fibonacci Hypercube structure is necessary for parallel matr...

Background and Objectives: Studies have shown to some extent the effectiveness of matrix therapy in reducing the severity of addiction and psychological consequences in general. The present study aimed to investigate the effectiveness of matrix therapy on suicidal tendency and the psychological dimensions of sexual problems in substance abusers. Methods: This was a quasi-experimental pretest ...