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Ge Y.-Y.,Shaanxi Normal University | Chang D.-W.,Shaanxi Normal University | Guo Y.,Shaanxi Post and Telecommunication College | Xiong J.-S.,Rongjiang Frist Senior Middle School
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2012

With the algebra, the necessary and sufficient condition for the convergence of the USAOR method as ω2=γ2 = 1 and ω1=γ1=I are discussed for solving the linear system Ax=b with (q,r) = (2, 1) consistently ordered matrix. Finally,the optimum parameter and the most superior spectrum radius are obtained under certain condions.


Xiong J.-S.,Shaanxi Normal University | Chang D.-W.,Shaanxi Normal University | Guo Y.,Shaanxi Normal University | Guo Y.,Shaanxi Post and Telecommunication College
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2012

The symmetric MSOR iterative method for solving linear systems of AX = b is discussed where A is a 2-cyclic coefficient matrices. The optimum parameters of the symmetric MSOR method was given for solving the linear system AX= b with 2-cyclic coefficient matrices when the characteristics of the Jacobi iteration matrix is real number or purely imaginary. And the results was illustrated by example.


Wang L.-S.,Shaanxi Normal University | Chang D.-W.,Shaanxi Normal University | Guo Y.,Shaanxi Post and Telecommunication College
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2012

Under the premise of the linear equations Ax = b coefficient matrix A is tridiagonal L matrix, the new preconditioned matrice P=I+S 1 is provided. Using USSOR iterative methods and the theory of matrix splitting, the new comparison theorems are obtained. Finally, the main results are demonstrated by numerical examples.


Chang M.-M.,Shaanxi Normal University | Chang D.-W.,Shaanxi Normal University | Guo Y.,Shaanxi Normal University | Guo Y.,Shaanxi Post and Telecommunication College
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2012

The upper bound for spectral radius of iterative matrix M-1 N is estimated when M is an α- diagnally dominant matrix. The esimations of p(A-1 ) and p(J) are obtained by calculating sufficient conditions for | λ(M-1N) |, and the numerical example illustrates the effectiveness of the criteria.


Guo Y.,Shaanxi Normal University | Guo Y.,Shaanxi Post and Telecommunication College | Chang D.-W.,Shaanxi Normal University
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2011

In order to improve the convergence rate of linear equations iterative method, using the appropriate pretreatment is necessary, that is the case PAx=Pb. The new preconditioned matrices P=I+C' was used. When the coefficient matrix A is nonsingular M-matrix, using the USSOR iterative methods and the theory of matrix splitting, the comparison theorem is obtained. Finally, the main result is demonstrated by a numerical example.


Guo J.,Xi'an University of Technology | Rong X.,Xi'an University of Technology | Liu H.,Shaanxi Post and Telecommunication College
ICIC Express Letters | Year: 2015

In this paper, we propose an improved iterative probabilistic inference algorithm for recommender systems (denoted as MIRS). The proposed algorithm is derived from the belief propagation based iterative recommender system (referred to as BPRS) and BPRS makes the recommendation list by computing message passing between user nodes and item (product) nodes of the factor graph whose edges represent ratings. Aiming at improving the prediction accuracy of ratings in MIRS, we give more reliability toward the users who are similar to the active user and the reliability is essential to the message update in belief propagation. Experiments on MovieLens dataset illustrate that the proposed recommendation algorithm is favorable in terms of accuracy and efficiency when compared with other state-of-the-art algorithms. © ICIC International 2015.


Wang Z.,Xi'an Technological University | Wang C.,Shaanxi Post and Telecommunication College
Metallurgical and Mining Industry | Year: 2015

Through the analysis of the principle of intersection measurement of two-CCD, a multi-field CCD mosaic method to increase the detection is proposed in this paper, which has solved the problems that a large target surface target measuring is in a small space. According to the CCD intersection measurement principle, which has divided the target surface into four regions effectively, a multi-CCD light target pellet coordinates has been established to calculate the data model. Analysis of mosaicing CCD of multi-measurement system measurement error shows that the sources of error are similar to the double CCD intersection measuring system. Analyzing of the linear array CCD intersection measuring target, measurement error is caused due to the overlapping CCD detection target surface.


Wang Z.,Xi'an Technological University | Xue G.,Xi'an Technological University | Wang C.,Shaanxi Post and Telecommunication College
Metallurgical and Mining Industry | Year: 2015

There are currently no test systems which can work in indoor environment of large screen set target. According to CCD optical target applying outdoor, the constitute of the light is analyzed, the method that the light source is designed to provide background illumination for CCD optical target using specific wavelengths light emitting diode is proposed. According to the CCD responsivity, the light source of CCD optical target is designed with wavelength of 680nm LED. Through the simulation tests, the distribution of luminous intensity of LED array is analyzed. The structural parameters of the light source is designed, the uniformity of the light source is enhanced further using double-sided frosted glass. Experiment shows that the effect of CCD optical target using light source designed in this paper is better then using natural light. The target measuring requirements are meted. The scope of application of CCD optical target is expanded.


Guo Y.,Shaanxi Post and Telecommunication College
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2015

Under the preconditioned matrix Ps, some errors of the USSOR iterative method are pointed out, when the coefficient matrix is an H-matrix. Meanwhile, the new preconditioned matrix Pg- and H-splitting theory are used in the convergence of preconditioned USSOR iterative method. Finally, main result is demonstrated by a numerical example.

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