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Office: CW 307.10
E-mail: Chun-Hua.Guo@uregina.ca
Phone: 306-585-4423
Website: http://uregina.ca/~chguo/

Current Classes
Math 103 (Calculus for Social Science & Management)

Research Interests
Matrix analysis, scientific computing, applications

### Recent Submissions

• #### A note on the fixed-point iteration for the matrix equations $X\pm A^*X^{-1}A=I$ ﻿

(Elsevier, 2008)
The fixed-point iteration is a simple method for finding the maximal Hermitian positive definite solutions of the matrix equations $X\pm A^*X^{-1}A=I$ (the plus/minus equations). The convergence of this method ...
• #### Detecting and solving hyperbolic quadratic eigenvalue problems ﻿

(SIAM, 2009)
Hyperbolic quadratic matrix polynomials $Q(\lambda) = \lambda^2 A + \lambda B + C$ are an important class of Hermitian matrix polynomials with real eigenvalues, among which the overdamped quadratics are those with ...
• #### Convergence Analysis of the Doubling Algorithm for Several Nonlinear Matrix Equations in the Critical Case ﻿

(SIAM, 2009)
In this paper, we review two types of doubling algorithm and some techniques for analyzing them. We then use the techniques to study the doubling algorithm for three different nonlinear matrix equations in the critical ...

(SIAM, 2009)
A 25-year old and somewhat neglected algorithm of Crawford and Moon attempts to determine whether a given Hermitian matrix pair $(A,B)$ is definite by exploring the range of the function $f(x) = x^*(A + iB)x/|x^*(A + ... • #### On Newton's method and Halley's method for the principal$p$th root of a matrix ﻿ (Elsevier, 2010) If$A$is a matrix with no negative real eigenvalues and all zero eigenvalues of$A$are semisimple, the principal$p$th root of$A$can be computed by Newton's method or Halley's method, with a preprocessing procedure ... • #### Convergence rates of some iterative methods for nonsymmetric algebraic Riccati equations arising in transport theory ﻿ (Elsevier, 2010) We determine and compare the convergence rates of various fixed-point iterations for finding the minimal positive solution of a class of nonsymmetric algebraic Riccati equations arising in transport theory. • #### The matrix equation$X+A^TX^{-1}A=Q$and its application in nano research ﻿ (SIAM, 2010) The matrix equation$X+A^TX^{-1}A=Q$has been studied extensively when$A$and$Q$are real square matrices and$Q$is symmetric positive definite. The equation has positive definite solutions under suitable conditions, ... • #### Solving a structured quadratic eigenvalue problem by a structure-preserving doubling algorithm ﻿ (SIAM, 2010) In studying the vibration of fast trains, we encounter a palindromic quadratic eigenvalue problem (QEP)$(\lambda^2 A^T + \lambda Q + A)z = 0$, where$A, Q \in \mathbb{C}^{n \times n}$and$Q^T = Q$. Moreover, the matrix ... • #### Complex symmetric stabilizing solution of the matrix equation$X+A^{T}X^{-1}A=Q$﻿ (Elsevier, 2011) We study the matrix equation$X+A^{T}X^{-1}A=Q$, where$A$is a complex square matrix and$Q$is complex symmetric. Special cases of this equation appear in Green's function calculation in nano research and also in the ... • #### On a nonlinear matrix equation arising in nano research ﻿ (SIAM, 2012) The matrix equation$X+A^{T}X^{-1}A=Q$arises in Green's function calculations in nano research, where$A$is a real square matrix and$Q$is a real symmetric matrix dependent on a parameter and is usually indefinite. ... • #### Numerical solution of nonlinear matrix equations arising from Green's function calculations in nano research ﻿ (Elsevier, 2012) The Green's function approach for treating quantum transport in nano devices requires the solution of nonlinear matrix equations of the form$X+(C^*+{\rm i} \eta D^*)X^{-1}(C+{\rm i} \eta D)=R+{\rm i}\eta P$, where$R$... • #### Iterative methods for a linearly perturbed algebraic matrix Riccati equation arising in stochastic control ﻿ (Taylor & Francis, 2013) We start with a discussion of coupled algebraic Riccati equations arising in the study of linear-quadratic optimal control problem for Markov jump linear systems. Under suitable assumptions, this system of equations has ... • #### Monotone convergence of Newton-like methods for M-matrix algebraic Riccati equations ﻿ (Springer, 2013) For the algebraic Riccati equation whose four coefficient matrices form a nonsingular$M$-matrix or an irreducible singular$M$-matrix$K$, the minimal nonnegative solution can be found by Newton's method and the doubling ... • #### On algebraic Riccati equations associated with M-matrices ﻿ (Elsevier, 2013) We consider the algebraic Riccati equation for which the four coefficient matrices form an$M$-matrix$K$. When$K$is a nonsingular$M$-matrix or an irreducible singular$M$-matrix, the Riccati equation is known to have ... • #### Performance enhancement of doubling algorithms for a class of complex nonsymmetric algebraic Riccati equations ﻿ (Oxford University Press, 2014) A new class of complex nonsymmetric algebraic Riccati equations has been studied by Liu and Xue (SIAM J. Matrix Anal. Appl., 33 (2012), 569-596), which is related to the M-matrix algebraic Riccati equations. Doubling ... • #### A convergence result for matrix Riccati differential equations associated with M-matrices ﻿ (2014-04-22) The initial value problem for a matrix Riccati differential equation associated with an$M$-matrix is known to have a global solution$X(t)$on$[0, \infty)$when$X(0)\$ takes values from a suitable set of nonnegative ...

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