Due to simultaneous horizontal and vertical displacement during vertical evacuation, the consequences of stampede congestion accidents can be more severe. Generally, pedestrians trigger a synchronization mechanism at some point during the vertical evacuation process. This synchronization behavior helps prevent stampede congestion and improves evacuation efficiency. This paper designs a well-controlled single-file vertical evacuation experiment. After the experiment, the video footage is imported into the TRACKER system to extract the coordinates of pedestrian step movements, after which the experimental data undergo calculations and visual analysis. The research findings indicate the following: Firstly, when the crowd coordinates trigger the synchronization mechanism, this behavior remains stable as long as pedestrian speed and direction are unchanged; Secondly, the variation in footstep speed over time is not directly related to the footstep synchronization rate of the crowd; Lastly, this study calculated the characteristic density value most likely to trigger the synchronization mechanism during vertical evacuation. This research deepens our understanding of crowd dynamics, reveals the characteristics of pedestrian movement during vertical evacuation, and proposes evacuation guidance strategies based on these features.
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http://dx.doi.org/10.1038/s41598-024-77726-7 | DOI Listing |
Radiat Prot Dosimetry
November 2024
Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan.
Long-term changes in particulate and dissolved 137Cs concentrations in rivers and dam reservoirs have been reconstructed using 137Cs depth distributions in bottom sediments near Chornobyl and Fukushima. However, few studies have applied this method to pond water. This study tested the applicability of this reconstruction method in ponds within the Fukushima evacuation zone.
View Article and Find Full Text PDFSci Rep
October 2024
College of Engineering , Sichuan Normal University, 610101, Chengdu Sichuan, China.
Int Urogynecol J
November 2024
Department of Gynecologic Surgery & Obstetrics Urogynecology Division, Walter Reed National Military Medical Center, 8901 Wisconsin Avenue, Bethesda, MD, 20889, USA.
Sensors (Basel)
February 2024
School of the Built Environment and Architecture, London South Bank University, London SE1 0AA, UK.
Walking speed is a significant aspect of evacuation efficiency, and this speed varies during fire emergencies due to individual physical abilities. However, in evacuations, it is not always possible to keep an upright posture, hence atypical postures, such as stoop walking or crawling, may be required for survival. In this study, a novel 3D passive vision-aided inertial system (3D PVINS) for indoor positioning was used to track the movement of 20 volunteers during an evacuation in a low visibility environment.
View Article and Find Full Text PDFCrit Care Nurs Q
March 2024
AHN LifeFlight, Pittsburgh, Pennsylvania; and Allegheny General Hospital, Pittsburgh, Pennsylvania.
Vertical flight was sought-after by scientists for centuries, finding early beginnings in children's toys and slowly developing into the modern helicopter. For centuries, true success was elusive, and many machines failed to achieve safe, controlled flight. Despite slow progress, vertical flight enthusiasts were unrelenting and continued trialing new concepts until one finally rose above the rest.
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