• K P Harikrishnan

      Articles written in Pramana – Journal of Physics

    • Aspects of stochastic resonance in Josephson junction, bimodal maps and coupled map lattice

      G Ambika Kamala Menon K P Harikrishnan

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      We present the results of extensive numerical studies on stochastic resonance and its characteristic features in three model systems, namely, a model for Josephson tunnel junctions, the bistable cubic map and a coupled map lattice formed by coupling the cubic maps. Some interesting features regarding the mechanism including multisignal amplification and spatial stochastic resonance are shown.

    • Efficient use of correlation entropy for analysing time series data

      K P Harikrishnan R Misra G Ambika

      More Details Abstract Fulltext PDF

      The correlation dimension $D_{2}$ and correlation entropy $K_{2}$ are both important quantifiers in nonlinear time series analysis. However, use of $D_{2}$ has been more common compared to $K_{2}$ as a discriminating measure. One reason for this is that $D_{2}$ is a static measure and can be easily evaluated from a time series. However, in many cases, especially those involving coloured noise, $K_{2}$ is regarded as a more useful measure. Here we present an efficient algorithmic scheme to compute $K_{2}$ directly from a time series data and show that $K_{2}$ can be used as a more effective measure compared to $D_{2}$ for analysing practical time series involving coloured noise.

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