Qiang. Ma

Work place: School of Power and Energy Engineering, Wuhan University of Technology, Wuhan, China

E-mail: richardkinbvle@yahoo.com.cn


Research Interests: Computational Learning Theory, Database Management System, Theory of Computation


Qiang Ma was born in Hebei province of China in 1981. He was a student in Wuhan University of Technology from 2000 to 2004, and got M.S. degree in marine engineering in 2007. He is now a doctoral student of Wuhan University of Technology. His research interests include linear system theory and nonlinear system theory and application.

Author Articles
Structural Conditions on Observability of Nonlinear Systems

By Qiang. Ma

DOI: https://doi.org/10.5815/ijitcs.2011.04.03, Pub. Date: 8 Aug. 2011

In this paper parameter space and Lebesgue measurement are introduced into analysis of nonlinear systems. Structural observability rank condition is defined and together with the distinguishabililty the structural observability criterions of nonlinear systems are obtained. It proves that when the parameters are not identifiable the solutions with the same time but different parameters are also indistinguishable. Differential geometry and algebraic methods are used to investigate the observability problem, and it is proved that there are some relations between these two methods. Finally, examples are used to illustrate applications of the structural observability criterions.

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Conditions on Structural Controllability of Nonlinear Systems: Polynomial Method

By Qiang. Ma

DOI: https://doi.org/10.5815/ijmecs.2011.02.01, Pub. Date: 8 Apr. 2011

In this paper the structural controllability of a class of a nonlinear system is investigated. The transfer function (matrix) of nonlinear systems is obtained by putting the nonlinear system model on non-commutative ring. Conditions of structural controllability of nonlinear systems are presented according to the criterion of linear systems structural controllability in frequency domain. An example is used to testify the presented conditions finally.

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