Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Shajahan, T.K.

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    Quantifying spatiotemporal complexity of cardiac dynamics using ordinal patterns
    (Institute of Electrical and Electronics Engineers Inc., 2015) Schlemmer, A.; Berg, S.; Shajahan, T.K.; Luther, S.; Parlitz, U.
    Analyzing the dynamics of complex excitation wave patterns in cardiac tissue plays a key role for understanding the origin of life-threatening arrhythmias and for devising novel approaches to control them. © 2015 IEEE.
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    Structure of Protein Interaction Network Associated With Alzheimer’s Disease Using Graphlet Based Techniques
    (Springer Science and Business Media B.V., 2022) Khasim, A.; Subramanian, V.; Ajith, K.M.; Shajahan, T.K.
    The crucial step in analyzing a real-world network is to choose an acceptable network model. We try to select an appropriate network model for the protein-protein interaction (PPI) network of Alzheimer’s disease (AD) using Graphlet-based metrics. The Relative Graphlet Frequency (RGF) count in the AD-PPI network is similar to that of the corresponding Scale-Free network. However, based on Graphlet Degree Distribution (GDD), the AD-PPI network has a good match with Geometric random graphs. The graphlet correlation statistics of the AD network show that it has a core-periphery topology. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
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    Dynamics of Chemical Excitation Waves Subjected to Subthreshold Electric Field in a Mathematical Model of the Belousov-Zhabotinsky Reaction
    (Springer Science and Business Media B.V., 2022) Sebastian, A.; Amrutha, S.V.; Punacha, S.; Shajahan, T.K.
    We present a numerical study of the dynamics of spiral waves in a weak external electric field, using the Oregonator model of the Belousov-Zhabotinky (BZ) reaction. Both free and pinned spiral waves are studied in two types of electric fields: unidirectional (DC) and Circularly Polarised Electric Field (CPEF). Both free spirals and pinned spiral waves rotate faster in the DC field. The CPEF can help a free spiral to be spatially confined. A pinned spiral period can be controlled by varying the period of the CPEF. Both DC and CPEF can unpin the pinned spiral wave, but the minimum electric field required to unpin is much less with CPEF compared to DC. Thus, CPEF is more energy efficient to unpin a pinned spiral wave. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
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    Variations in the Scroll Ring Characteristics with the Excitability and the Size of the Pinning Obstacle in the BZ Reaction
    (Springer Science and Business Media B.V., 2022) Sibeesh, P.; Amrutha, S.V.; Shajahan, T.K.
    We report the experimental results of the effects of excitability on the wave characteristics of free rotating and pinned scroll rings in the Belousov-Zhabotinsky (BZ) reaction. The experiments show that the stability of the scroll ring depends on the excitability of the medium. At low excitability, the scroll ring becomes less stable and eventually breaks up. As we increase the excitability of the medium, the time period (T) and wavelength (λ ) of the excitation wave decrease while wave velocity (v) increases. Properties of both free and pinned scroll rings change in the same way. However, at a given excitability, both the λ and v of a pinned scroll ring increase with the size of the obstacle. For the range of parameters chosen in our experiments, the excitability changes brought by varying reactant concentrations have a higher impact on the scroll ring properties than those induced by the size of the pinning obstacle. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
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    Image Acquisition and Electric Field Application in the Belousov-Zhabotinsky Reaction Using LabVIEW
    (Springer Science and Business Media Deutschland GmbH, 2024) Sibeesh, P.; Shajahan, T.K.
    This paper introduces LabVIEW-based software and hardware designed to simultaneously record and control chemical wave activity in the Belousov-Zhabotinsky (BZ) reaction. The chemical waves in the BZ reaction can be controlled by DC and polarized electrical stimuli. Our software can be used to study the interaction of DC or different types of polarized electric fields with chemical waves. The software allows the user to capture and save images for further analysis. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
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    Drift and Annihilation of a Counter-Rotating Spiral Pair in Belousov-Zhabotinsky Reaction Under a DC Electric Field
    (Springer Science and Business Media Deutschland GmbH, 2024) Mishra, P.R.; Sebastian, A.; Shajahan, T.K.
    We present a numerical study of the dynamics of the counter-rotating spiral pair in the presence of a DC electric field using the Oregonator model of the Belousov-Zhabotinky (BZ) reaction. The dynamics of the counter-rotating pair is investigated by changing the strength and direction of the electric field. The dynamics can change from meander to drift with increasing field strength. The drift velocity increases with the field strength, and its direction depends on the direction of the field. Finally, the spiral pair is annihilated when the applied field is above a threshold value. With further increase in field strength, the annihilation is followed by generation of a new counter-rotating pair oriented opposite to the initial pair. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.