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297 results on '"Joshi, Varun"'

1. Ankle Exoskeletons May Hinder Standing Balance in Simple Models of Older and Younger Adults

Author

Raz, Daphna, Joshi, Varun, Umberger, Brian R., and Ozay, Necmiye

Subjects
Physics - Medical Physics, Computer Science - Robotics
Abstract

Humans rely on ankle torque to maintain standing balance, particularly in the presence of small to moderate perturbations. Reductions in maximum torque (MT) production and maximum rate of torque development (MRTD) occur at the ankle with age, diminishing stability. Ankle exoskeletons are powered orthotic devices that may assist older adults by compensating for reduced muscle force and power production capabilities. They may also be able to assist with ankle strategies used for balance. However, no studies have investigated the effect of such devices on balance in older adults. Here, we model the effect ankle exoskeletons have on stability in physics-based models of healthy young and old adults, focusing on the mitigation of age-related deficits such as reduced MT and MRTD. We show that an ankle exoskeleton moderately reduces feasible stability boundaries in users who have full ankle strength. For individuals with age-related deficits, there is a trade-off. While exoskeletons augment stability in low velocity conditions, they reduce stability in some high velocity conditions. Our results suggest that well-established control strategies must still be experimentally validated in older adults., Comment: 14 pages, 7 figures

Published
2024

11. Energy and Exergetic Analysis of Thermal Transport in Latent Heat Thermal Energy Storage Systems Impregnated with Metal Foam

Author

Joshi, Varun, Patel, Jay R., Rathod, Manish K., Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Haddar, Mohamed, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Mehta, Hemant B., editor, Rathod, Manish K., editor, Abiev, Rufat, editor, and Arıcı, Müslüm, editor

Published
2023
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15. Numerical approximations of CNLS equations via UAH tension B-spline DQM

Author

Kapoor Mamta and Joshi Varun

Subjects
dqm, uah tension b-spline, coupled schrödinger equations, ssp-rk 43 regime, matrix method, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Via UAH tension B-spline DQM in the present research, numerical approximation of coupled Schrödinger equations in one and two dimensions is fetched. In the present research, a novel regime is generated as a fusion of a UAH tension B-spline of fourth-order and DQM to fetch the requisite weighting coefficients. To ensure the adaptability and effectiveness of the proposed regime, different numerical examples are elaborated. Present results are matched with previous results, and the elastic property is also validated for solitons. The fetched ordinary differential equations system is handled via the SSP-RK43 regime. The stability of the present method is verified via the matrix method. The robustness of the proposed regime is affirmed via error norms. The fetched results are acceptable and validated. Elasticity property via wave interaction is also covered in the present research. The present study also focuses on one very important property of physics, like elasticity, which is rarely discussed in the literature. The developed numerical regime will undoubtedly be useful in addressing various fractional partial differential equations of complex nature as well.

Published
2023
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39. An improved exponential metric space approach for C‐mean clustering analysing.

Author

Kumar, Rakesh, Joshi, Varun, Dhiman, Gaurav, and Viriyasitavat, Wattana

Subjects
*CENTROID, *GAUSSIAN function, *COMPUTATIONAL complexity, *METRIC spaces, *ALGORITHMS
Abstract

In this article, we present two resilient algorithms, the improved alternative hard c‐means (IAHCM) and the improved alternative fuzzy c‐means (IAFCM). We implement the Gaussian distance‐dependent function proposed by Zhang and Chen (D.‐Q. Zhang and Chen, 2004). In some cases, Zhang and Chen's metric distance does not account for the clustering centroid effect predicted by the large value. R* is employed in IAHCM and IAFCM to discover robust results while minimizing its sensitivity. Experiments are conducted using two‐and three‐dimensional data, including Diamond and Iris real‐world data. The results are based on demonstrating the robust simplicity and applicability of the offered algorithms. Similarly, computational complexity is assessed. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Glacial Lake Inventory of Kinnaur District, Himachal Pradesh, India derived from Landsat Images

Author

Singh, Divya and Joshi, Varun

Abstract

Climate change and associated glacier recession have led to the formation of new glacial lakes and the expansion of existing lakes across the Himalayas. Such lakes pose a potential glacial lake outburst floods (GLOFs) threat to downstream communities and infrastructure. The accelerated growth of glacial lakes has resulted in increased hazard and damage potential of GLOFs in Kinnaur district, Himachal Pradesh. To understand the spatiotemporal dynamism, a temporal inventory of glacial lakes in the study area for the years 2000, 2010, and 2022 is prepared at 30m resolution using Landsat satellite imagery. The study performed a three-step semi-automatic method for mapping glacial lakes based on geospatial techniques that included the use of the normalized difference water index (NDWI), elimination of mountain shadows using the Cartosat digital elevation model (DEM), and manual vectorization of lakes using Google Earth imagery. A total of 147 glacial lakes were identified having an area > 0.25 ha for the year 2022. This study presents an important database of glacial lakes and provides a basis for long-term monitoring and evaluation of outburst flood disasters primarily caused by glacial lakes in the study area., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)

Published
2023

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