MODEL STRUCTURAL INFERENCE USING LOCAL DYNAMIC OPERATORS

AbstractLocal dynamic running stability is the ability of a dynamic system to compensate for small perturbations during running. While the immediate effects of footwear on running biomechanics are frequently investigated, no research has studied the long-term effects of barefoot vs. shod running on local dynamic running stability. In this randomized single-blinded controlled trial, young adults novice to barefoot running were randomly allocated to a barefoot or a cushioned footwear running group. Over an 8-week-period, both groups performed a weekly 15-min treadmill running intervention in the allocated condition at 70% of their VO2 max velocity. During each session, an inertial measurement unit on the tibia recorded kinematic data (angular velocity) which was used to determine the short-time largest Lyapunov exponents as a measure of local dynamic running stability. One hundred running gait cycles at the beginning, middle, and end of each running session were analysed using one mixed linear multilevel random intercept model. Of the 41 included participants (48.8% females), 37 completed the study (drop-out = 9.7%). Participants in the barefoot running group exhibited lower running stability than in the shod running group (p = 0.037) with no changes during the intervention period (p = 0.997). Within a single session, running stability decreased over the course of the 15-min run (p = 0.012) without differences between both groups (p = 0.060). Changing from shod to barefoot running reduces running stability not only in the acute phase but also in the longer term. While running stability is a relatively new concept, it enables further insight into the biomechanical influence of footwear.

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On-chip trans-dimensional plasmonic router

Nanophotonics ◽

10.1515/nanoph-2020-0078 ◽

2020 ◽

Vol 9 (10) ◽

pp. 3357-3365 ◽

Cited By ~ 1

Author(s):

Shaohua Dong ◽

Qing Zhang ◽

Guangtao Cao ◽

Jincheng Ni ◽

Ting Shi ◽

...

Keyword(s):

High Speed ◽

High Efficiency ◽

Incident Angle ◽

Reciprocal Lattice ◽

Plasmonic Waveguide ◽

Optical Diffraction ◽

Local Dynamic ◽

Phase Gradient ◽

On Chip ◽

Plasmon Polaritons

AbstractPlasmons, as emerging optical diffraction-unlimited information carriers, promise the high-capacity, high-speed, and integrated photonic chips. The on-chip precise manipulations of plasmon in an arbitrary platform, whether two-dimensional (2D) or one-dimensional (1D), appears demanding but non-trivial. Here, we proposed a meta-wall, consisting of specifically designed meta-atoms, that allows the high-efficiency transformation of propagating plasmon polaritons from 2D platforms to 1D plasmonic waveguides, forming the trans-dimensional plasmonic routers. The mechanism to compensate the momentum transformation in the router can be traced via a local dynamic phase gradient of the meta-atom and reciprocal lattice vector. To demonstrate such a scheme, a directional router based on phase-gradient meta-wall is designed to couple 2D SPP to a 1D plasmonic waveguide, while a unidirectional router based on grating metawall is designed to route 2D SPP to the arbitrarily desired direction along the 1D plasmonic waveguide by changing the incident angle of 2D SPP. The on-chip routers of trans-dimensional SPP demonstrated here provide a flexible tool to manipulate propagation of surface plasmon polaritons (SPPs) and may pave the way for designing integrated plasmonic network and devices.

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Local dynamic behaviors of long 0-π Josephson junction

Physica Scripta ◽

10.1088/1402-4896/aba5ac ◽

2020 ◽

Vol 95 (8) ◽

pp. 085221

Author(s):

Weipeng Hu ◽

Zhen Wang ◽

Gangwei Wang ◽

Abdul-Majid Wazwaz

Keyword(s):

Josephson Junction ◽

Local Dynamic ◽

Dynamic Behaviors

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Local Dynamic Path Planning for an Ambulance Based on Driving Risk and Attraction Field

Sustainability ◽

10.3390/su13063194 ◽

2021 ◽

Vol 13 (6) ◽

pp. 3194

Author(s):

Fang Zong ◽

Meng Zeng ◽

Yang Cao ◽

Yixuan Liu

Keyword(s):

Path Planning ◽

Potential Field ◽

Velocity Potential ◽

Attractive Potential ◽

Local Dynamic ◽

Repulsive Potential ◽

Ambulance Personnel ◽

Lane Changing ◽

Dynamic Path Planning ◽

Dynamic Path

Path planning is one of the most important aspects for ambulance driving. A local dynamic path planning method based on the potential field theory is presented in this paper. The potential field model includes two components—repulsive potential and attractive potential. Repulsive potential includes road potential, lane potential and obstacle potential. Considering the driving distinction between an ambulance and a regular vehicle, especially in congested traffic, an adaptive potential function for a lane line is constructed in association with traffic conditions. The attractive potential is constructed with target potential, lane-velocity potential and tailgating potential. The design of lane-velocity potential is to characterize the influence of velocity on other lanes so as to prevent unnecessary lane-changing behavior for the sake of time-efficiency. The results obtained from simulation demonstrate that the proposed method yields a good performance for ambulance driving in an urban area, which can provide support for designing an ambulance support system for the ambulance personnel and dispatcher.

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