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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. Source


Wang Z.,Xian Technological University | Xue G.,Xian 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. Source


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. Source


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. Source


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. Source

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