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Shashank Sharma

Possible papers associated with this exact author name in Arrow. This page groups case-insensitive exact name matches and is not a full identity disambiguation profile.

3 papers
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3

ICRA Conference 2025 Conference Paper

Autonomous Drone for Dynamic Smoke Plume Tracking

  • Srijan Kumar Pal
  • Shashank Sharma
  • Nikil Krishnakumar
  • Jiarong Hong

This paper presents a novel autonomous drone-based smoke plume tracking system capable of navigating and tracking plumes in highly unsteady atmospheric conditions. The system integrates advanced hardware and software and a comprehensive simulation environment to ensure robust performance in controlled and real-world settings. The quadrotor, equipped with a high-resolution imaging system and an advanced onboard computing unit, performs precise maneuvers while accurately detecting and tracking dynamic smoke plumes under fluctuating conditions. Our software implements a two-phase flight operation: descending into the smoke plume upon detection and continuously monitoring the smoke's movement during in-plume tracking. Leveraging Proportional Integral-Derivative (PID) control and a Proximal Policy Optimization (PPO) based Deep Reinforcement Learning (DRL) controller enables adaptation to plume dynamics. Unreal Engine simulation evaluates performance under various smoke-wind scenarios, from steady flow to complex, unsteady fluctuations, showing that while the PID controller performs adequately in simpler scenarios, the DRL-based controller excels in more challenging environments. Field tests corroborate these findings. This system opens new possibilities for drone-based monitoring in areas like wildfire management and air quality assessment. The successful integration of DRL for real-time decision-making advances autonomous drone control for dynamic environments.

IROS Conference 2024 Conference Paper

Saturation in the Null-Space (SNS) for Tele-operated Surgery: Prioritized Motion Control for RCM and Joint Limit Constraints

  • Sreekanth Kana
  • Antonia Pérez Arias
  • Robert Kahlau
  • Pavan Kanajar
  • Shashank Sharma

This paper showcases the application of the Saturation in the Null Space (SNS) algorithm to establish task prioritization and coordination within a tele-operated minimally invasive robotic surgical setting. In our work, SNS prioritizes achieving Remote Center of Motion (RCM) constraint, ensuring safe instrument manipulation, while respecting joint constraints for uninterrupted robot operation. This prioritization allows for accommodating the tracking of the surgeon’s motion, within the capabilities defined by RCM and joint constraints. We investigate both the velocity and acceleration control variants of the SNS algorithm, incorporating bespoke adjustments to tailor the original algorithm to the intricate requirements of surgical applications. Through simulations and experiments, this work aims to demonstrate the effectiveness of SNS in enhancing the safety and controllability of tele-operated surgery, paving the way for its integration in various surgical procedures.

AAAI Conference 2018 Conference Paper

No Modes Left Behind: Capturing the Data Distribution Effectively Using GANs

  • Shashank Sharma
  • Vinay Namboodiri

Generative adversarial networks (GANs) while being very versatile in realistic image synthesis, still are sensitive to the input distribution. Given a set of data that has an imbalance in the distribution, the networks are susceptible to missing modes and not capturing the data distribution. While various methods have been tried to improve training of GANs, these have not addressed the challenges of covering the full data distribution. Specifically, a generator is not penalized for missing a mode. We show that these are therefore still susceptible to not capturing the full data distribution. In this paper, we propose a simple approach that combines an encoder based objective with novel loss functions for generator and discriminator that improves the solution in terms of capturing missing modes. We validate that the proposed method results in substantial improvements through its detailed analysis on toy and real datasets. The quantitative and qualitative results demonstrate that the proposed method improves the solution for the problem of missing modes and improves training of GANs.

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