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RAMANUJAM,T. VALANARASU 한국전산응용수학회 2007 Journal of applied mathematics & informatics Vol.23 No.1
In this paper a numerical method is presented to solve singularly perturbed two points boundary value problems for second order ordinary differential equations consisting a discontinuous source term. First, in this method, an asymptotic expansion approximation of the solution of the boundary value problem is constructed using the basic ideas of a well known perturbation method WKB. Then some initial value problems and terminal value problems are constructed such that their solutions are the terms of this asymptotic expansion. These initial value problems are happened to be singularly perturbed problems and therefore fitted mesh method (Shishkin mesh) are used to solve these problems. Necessary error estimates are derived and examples provided to illustrate the method.
Development of a Neuro Controller for a Negative Output Elementary Luo Converter
Ramanujam Kayalvizhi,Sirukarumbur Pandurangan Natarajan,Padmaloshani Palanisamy 전력전자학회 2007 JOURNAL OF POWER ELECTRONICS Vol.7 No.2
The negative output elementary Luo converter is a newly developed DC-DC converter. Due to the time-varying and switching nature of the above converter, its dynamic behavior becomes highly non-linear. Conventional controllers are incapable of providing good dynamic performance for such a converter and, hence, a neural network is utilized as a controller in this work. The performance of the chosen Luo converter using PI versus neuro controls is compared under load and line disturbances using MATLAB and TMS320F2407 DSP. The results validate the superiority of the developed neuro controller.