Saptarshi Ghosh

ORCID: 0000-0001-8861-5269
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Research Areas
  • Nonlinear Dynamics and Pattern Formation
  • Slime Mold and Myxomycetes Research
  • Neural dynamics and brain function
  • Antenna Design and Analysis
  • Advanced Memory and Neural Computing
  • Microwave Engineering and Waveguides
  • stochastic dynamics and bifurcation
  • Neural Networks Stability and Synchronization
  • Chaos control and synchronization
  • Millimeter-Wave Propagation and Modeling
  • Cell Image Analysis Techniques
  • Antenna Design and Optimization
  • EEG and Brain-Computer Interfaces
  • Neural Networks and Applications
  • Complex Systems and Time Series Analysis
  • Advanced Antenna and Metasurface Technologies
  • Neural Networks and Reservoir Computing
  • Neuroscience and Neural Engineering
  • Metamaterials and Metasurfaces Applications
  • Legal Education and Practice Innovations
  • Quantum Information and Cryptography
  • Artificial Intelligence in Law
  • Complex Network Analysis Techniques
  • Functional Brain Connectivity Studies
  • Gene Regulatory Network Analysis

SIB Swiss Institute of Bioinformatics
2024

University of Zurich
2024

ETH Zurich
2024

Indian Institute of Technology Indore
2015-2023

The chimera state with co-existing coherent-incoherent dynamics has recently attracted a lot of attention due to its wide applicability. We investigate non-locally coupled identical chaotic maps delayed interactions in the multiplex network framework and find that an interplay delay multiplexing brings about enhanced or suppressed appearance depending on distribution as well parity values layers. Additionally, we report layer existence one displaying coherent another demonstrating incoherent...

10.1209/0295-5075/115/60005 article EN EPL (Europhysics Letters) 2016-09-01

Chimera is a relatively new emerging phenomenon where coexistence of synchronous and asynchronous states observed in symmetrically coupled dynamical units. We report the observation chimera state multiplex networks individual layer represented by 1-d lattice with nonlocal interactions. While, multiplexing does not change type retains multi-chimera displayed isolated networks, it changes regions incoherence. investigate emergence coherent–incoherent bifurcation upon varying control...

10.1142/s0218127416501200 article EN International Journal of Bifurcation and Chaos 2016-06-30

10.1016/j.chaos.2017.11.010 article EN Chaos Solitons & Fractals 2017-11-15

Complex networks consisting of several interacting layers allow for special dynamics caused by time delay. We study the scenarios delay induced patterns in a three-layer network FitzHugh-Nagumo oscillators, where each layer has nonlocal coupling topology. Varying connections, we observe chimera states, i.e., complex spatio-temporal coexisting coherent and incoherent domains. In particular, focus on interplay intra-layer inter-layer term. parameter plane two times find regions existence...

10.3389/fams.2019.00019 article EN cc-by Frontiers in Applied Mathematics and Statistics 2019-04-24

We study impact of multiplexing on the global phase synchronizability different layers in delayed coupled multiplex networks. find that at strong couplings, induces synchronization sparse The introduction synchrony depends connection density being multiplexed, which further underlying network architecture. Moreover, may lead to a transition from quasi-periodic or chaotic evolution periodic evolution. For case, change period dynamical Additionally, delay couplings bring upon those networks do...

10.1209/0295-5075/111/30010 article EN EPL (Europhysics Letters) 2015-08-01

Chimera state refers to coexistence of coherent and non-coherent phases in identically coupled dynamical units found various complex systems. Identification Chimera, on one hand is essential due its applicability areas including neuroscience, other challenging widely varied appearance different systems the peculiar nature profile. Therefore, a simple yet universal method for identification remains an open problem. Here, we present very distinctive approach using machine learning techniques...

10.1063/1.5143285 article EN Chaos An Interdisciplinary Journal of Nonlinear Science 2020-06-01

Yes! Very much so. A chimera state refers to the coexistence of a coherent-incoherent dynamical evolution identically coupled oscillators. We investigate impact multiplexing layer having repulsively oscillators on occurrence chimeras in attractively identical report that there exists an enhancement appearance one multiplex network presence repulsive coupling other layer. Furthermore, we show small amount inhibition or is sufficient yield another by destroying its synchronized behavior. These...

10.1063/1.5005576 article EN Chaos An Interdisciplinary Journal of Nonlinear Science 2017-10-01

AILA 2021 was the third edition of Shared task on Artificial Intelligence for Legal Assistance, that organized with FIRE conference. This year two tasks were offered. While rhetorical role labelling continued from last year, a new Judgement Summarization introduced in current edition. In Rhetorical Role Labelling task, given case document, sentences document to be classified into 7 roles – Fact, Ruling by Lower Court, Argument, Precedent, Statute, Ratio decision and Present Court. The legal...

10.1145/3503162.3506571 article EN Forum for Information Retrieval Evaluation 2021-12-13

Chimera and Solitary states have captivated scientists engineers due to their peculiar dynamical corresponding the co-existence of coherent incoherent evolution in coupled units various natural artificial systems. It has been further demonstrated that such can be engineered systems oscillators by suitable implementation communication delays. Here, using supervised machine learning, we predict (a) precise value delay which is sufficient for engineering chimera solitary a given set system...

10.3389/fphy.2021.513969 article EN cc-by Frontiers in Physics 2021-04-13

Epilepsy is a neurological disease characterized by epileptic seizures, which commonly manifest with pronounced frequency and amplitude changes in the EEG signal. In case of focal initially localized pathological activity spreads from so-called "onset zone" to wider network brain areas. Chimeras, defined as states simultaneously occurring coherent incoherent dynamics symmetrically coupled networks are increasingly invoked for characterization seizures. particular, chimera-like have been...

10.1101/2024.05.26.595969 preprint EN cc-by-nc-nd bioRxiv (Cold Spring Harbor Laboratory) 2024-05-31

Symmetry breaking spatial patterns, referred to as chimera states, have recently been catapulted into the limelight due their coexisting coherent and incoherent hybrid dynamics. Here, we present a method engineer state by using an appropriate distribution of heterogeneous time delays on edges network. The in interactions, intrinsic natural or artificial complex systems, are known induce various modifications spatiotemporal behaviors coupled dynamics networks. Using chaotic map with identical...

10.1063/1.5042133 article EN Chaos An Interdisciplinary Journal of Nonlinear Science 2018-07-01

Chimera referring to a coexistence of coherent and incoherent states, is traditionally very difficult control due its peculiar nature.Here, we provide recipe construct chimera states in the multiplex networks with aid multiplexing-delays.The state produced by introducing heterogeneous delays fraction inter-layer links, referred as multiplexing-delay, sequence.Additionally, emergence incoherence can be regulated making appropriate choice both inter-and intra-layer coupling strengths, whereas...

10.1209/0295-5075/127/30002 article EN EPL (Europhysics Letters) 2019-09-12

The largest eigenvalue of a network provides understanding to various dynamical as well stability properties the underlying system. We investigate an interplay inhibition and multiplexing on statistics networks. Using numerical experiments, we demonstrate that presence inhibitory coupling may lead very different behaviour multiplex networks than those isolated depending upon architecture individual layer. there is transition from Weibull Gumbel or Frechet distribution are multiplexed....

10.1209/0295-5075/115/10001 article EN EPL (Europhysics Letters) 2016-07-01

This paper presents a four element dual band MIMO patch antenna for millimeter-wave (mm-wave) wireless communication in Ka-band (26-40 GHz) applications. The proposed design consists of one U-shaped monopole along with two split ring resonators (SRRs) symmetrically placed respect to the feed line on top layer and defected ground plane. By precisely optimizing parameters, geometry radiates at 28 GHz 36 peak gains 4.21 dBi 6.05 dBi, respectively. A single has initially been designed detailed...

10.1109/wams54719.2022.9847846 article EN 2022 IEEE Wireless Antenna and Microwave Symposium (WAMS) 2022-06-05

Long-term monitoring of biomedical signals is essential for the modern clinical management neurological conditions such as epilepsy. However, developing wearable systems, able to monitor, analyze, and detect epileptic seizures with long-lasting operation times, using current technologies still an open challenge. Brain-inspired spiking neural networks (SNNs) represent a promising signal processing computing framework they can be deployed on ultra-low power neuromorphic this purpose. Here, we...

10.1101/2024.05.22.595225 preprint EN cc-by-nc-nd bioRxiv (Cold Spring Harbor Laboratory) 2024-05-22

Abstract Seizure detection stands as a critical aspect of epilepsy management, which requires continuous monitoring to improve patient care. However, existing systems face challenges in providing reliable, long-term, portable solutions due the computational expense and power demands processing data transmission. Edge computing offers viable solution by enabling efficient locally, close sensors without having transmit sensory signals remote platforms. In this work, we present mixed-signal...

10.1101/2024.06.13.24308876 preprint EN cc-by-nc-nd medRxiv (Cold Spring Harbor Laboratory) 2024-06-13

In this paper, a polarization insensitive rasorber geometry with switchable transmission/ reflection characteristic is presented. The proposed structure consists of two layers separated by an air spacer; the top lossy layer achieved using cross dipole made resistive ink and bottom slot-based topology four embedded p-i-n diodes. use diodes help in switching working state from transmission band to as diodes' bias condition changes OFF ON state. Thus, overall exhibits response (absorber +...

10.1109/incap52216.2021.9726477 article EN 2021 IEEE Indian Conference on Antennas and Propagation (InCAP) 2021-12-13

In this paper, a compact two-element multiple input output (MIMO) antenna array system is presented in millimeter-wave (mm-wave) spectrum having dual-band functionality, high gain, good isolation, and broadside radiation pattern. Firstly, single designed by loading complementary split ring resonator (CSRR) unit cell on conventional patch. An structure, consisting of 2 elements, then realized using T-junction power divider. Finally, the 1 x MIMO intelligently placing units to achieve topology...

10.1109/mapcon56011.2022.10047398 article EN 2022-12-12

In this paper, a double-layer cross-slot aperture-fed wideband circularly polarized antenna for 5G millimeter-wave applications has been designed and demonstrated. Each of the radiating elements comprises two parasitic trapezoid patches three suspended metallic vias, which are excited through an aperture coupling technique with help geometry. The element produces superior performance in terms wide 3-dB axial ratio bandwidth (ARBIV) (26.20-34.16 GHz), −10 dB impedance (25.5 - 35.0 large gain...

10.1109/apmc57107.2023.10439831 article EN 2015 Asia-Pacific Microwave Conference (APMC) 2023-12-05

This paper presents a substrate integrated waveguide (SIW) based MIMO antenna array operating at 28 GHz, intended for millimeter-wave (mm-wave) wireless applications. The design entails hexagonal slot etched into the upper layer of SIW cavity. Through meticulous optimization different parameters (the slot's dimensions and its placement within cavity), broadside radiation pattern is resulted featuring an impedance bandwidth 370 MHz (from 27.82 GHz to 28.19 GHz) centered around peak gain 6.10...

10.1109/mapcon58678.2023.10463723 article EN 2023-12-11
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