18 papers · ranked by Valyu relevance
Georgios Akrivis, Sören Bartels, Michele Ruggeri, Jilu Wang
We construct and analyze a projection-free linearly implicit method for the approximation of flows of harmonic maps into spheres. The proposed method is unconditionally energy stable and, under a sharp discrete regularity condition, achieves second-order accuracy with respect to the constraint violation. Furthermore…
Abderrahim Zemmit, Abdelouadoud Loukriz, Khaled Belhouchet, Yahya Z. Alharthi + 3 more
'Yahya Z. Alharthi' 'Muhannad Alshareef' 'Prabhu Paramasivam' 'Sherif S. M. Ghoneim'] The nonlinear characteristics and low efficiency of photovoltaic (PV) systems remain critical challenges that necessitate advanced solutions. This study proposes two innovative Maximum Power Point Tracking (MPPT) algorithms based on…
Lars T. Kyllingstad
When two simulation units in a continuous-time co-simulation are connected via some variable , and both simulation units have an internal state which represents the time integral of , there will generally be a discrepancy between those states due to extrapolation errors. Normally, such extrapolation errors diminish if…
Qiaran Lu, Huanding Qin, Fangmin He, Yunshuo Zhang + 2 more
'Jin Meng'] The interference cancellation ratio (ICR) is a key performance indicator of digital-to-analog hybrid radio frequency (RF) interference cancellation systems. Aiming at the low convergence speed of a digital-to-analog hybrid RF interference cancellation system based on a multi-tap structure (MDARFICS), a…
Jiayi Geng, Fanqing Ji, Shouliang Li, Yulin Shen + 2 more
'Boris Ryabko'] Pulse-coupled neural networks (PCNNs) are capable of segmenting digital images in a multistage unsupervised fashion; however, optimal output selection remains challenging. To address the above problem, this paper emphasizes the role of the step size, which influences the decreasing speed of the membrane…
Zhaoqing Mu, Ying Gao, Xinyu Guo, Shifeng Ou + 2 more
'Anastasios Doulamis'] Active Noise Control (ANC) is frequently utilized to minimize noise in industrial environments. However, the powerful pulses in industrial noise pose challenges to its application. Consequently, ANC systems necessitate a high-performance algorithm as a core component. In this process, the…
Robert M. Gower, Mathieu Blondel, Nidham Gazagnadou, Fabián Pedregosa
'Fabián Pedregosa'] Tuning the step size of stochastic gradient descent is tedious and error prone. This has motivated the development of methods that automatically adapt the step size using readily available information. In this paper, we consider the family of SPS (Stochastic gradient with a Polyak Stepsize) adaptive…
Haonan Hu, Xin Wen, Jiazun Hu, Haiyu Chen + 3 more
'Yongmin Zhong'] In this paper, a planning method based on the spatiotemporal variable-step-size A algorithm is proposed to address the problem of safe trajectory planning for incremental, wheeled, mobile robots in complex motion scenarios with multiple robots. After constructing the known conditions, the…
Adam B. Grimmitt, Maeve E. Whelan, Douglas N. Martini, Wouter Hoogkamer
Older adults and neurological populations tend to walk with slower speeds, more gait variability, and a higher metabolic cost. This higher metabolic cost could be related to their increased gait variability, but this relationship is still unclear. The purpose of this study was to determine how increased step length…
Sebastiano Grazzi, Nikolas Nüsken, Lionel Riou-Durand
The performance of Metropolis–Hastings algorithms is highly sensitive to the choice of step size, and miss-specification can lead to severe loss of efficiency. We study algorithms with randomized step sizes, considering both auxiliary-variable and marginalized constructions. We show that algorithms with a randomized…
Mário B. Amaro
This work introduces an approach to variable-step Finite Difference Method (FDM) where nonuniform meshes are generated via a weight function, which establishes a diffeomorphism between uniformly spaced computational coordinates and variably spaced physical coordinates. We then derive finite difference approximations…
David M. Desmet, Joseph P. Cusumano, Jonathan B. Dingwell
To successfully traverse their environment, humans must often perform maneuvers to achieve desired task goals while simultaneously maintaining balance. Humans accomplish these tasks primarily by modulating their foot placements. As humans are more unstable laterally, we must better understand how humans modulate…
Anna C. Render, Joseph P. Cusumano, Jonathan B. Dingwell
Most often, gait biomechanics is studied during straight-ahead walking. However, real-life walking imposes various lateral maneuvers people must navigate. Such maneuvers challenge people’s lateral balance and can induce falls. Determining how people regulate their stepping movements during such complex walking tasks is…
Anna C. Render, Tarkeshwar Singh, Joseph P. Cusumano, Jonathan B. Dingwell
Goal-directed walking involves regulating foot placements to achieve specific tasks. This requires visuomotor integration. Perceptual, cognitive, and contextual salience guide attention and motor planning for navigation. Here, we quantified how perceptual salience informs lateral foot placement while walking.…
Kyosuke Oku, Shinsuke Tanaka, Yukiko Nishizaki, Chie Fukada + 1 more
'Noriyuki Kida'] In daily life, we walk naturally by considering our physical characteristics and formulating appropriate motor plans. However, the impact of changes in body image on walking movements during motor planning remains poorly understood. Therefore, in this study, we examined changes in walking behavior…
Pawel Kudzia, Stephen N. Robinovich, J. Maxwell Donelan
Our legs act as our primary contact with the surrounding environment, generating external forces that enable agile motion. To be agile, the nervous system has to control both the magnitude of the force that the feet apply to the ground and the point of application of this force. The purpose of this study was to…
Aojun Jiang, Francis M. Grover, Mary Bucklin, Jasjit Deol + 2 more
The impact of environmental uncertainty on locomotor adaptation remains unclear. Environmental uncertainty could either aid locomotor adaptation by prompting protective control strategies that stabilize movements to assist learning or impede adaptation by reducing error sensitivity and fostering hesitance to pursue…
Meghan E. Kazanski, Joseph P. Cusumano, Jonathan B. Dingwell
Walking humans often navigate complex, dynamically changing walking paths. To better understand falling risk, is critical that we first determine how older adults purposefully vary their steps in varying environments that challenge balance. Here, 20 young (21.7±2.6 yrs) and 18 older (71.6±6.0 yrs) healthy adults walked…