Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Sungchan Hong"'
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-9 (2023)
Abstract The link between aerosol dynamics and viral exposure risk is not fully understood, particularly during movement and face-to-face interactions. To investigate this, we employed Particle Trace Velocimetry with a laser sheet and a high-speed ca
Externí odkaz:
https://doaj.org/article/8b1f6560a29348aaadfe2b6b4006c413
Publikováno v:
Applied Sciences, Vol 14, Iss 9, p 3932 (2024)
Eight balls were manufactured with a 3D printer to resemble various types of 32-panel soccer balls. One ball was completely smooth, whereas the other seven possessed various dimple patterns on their surface panels. Seam width and seam depth were also
Externí odkaz:
https://doaj.org/article/4e61b9917fed43f2b21a2727cc24e799
Autor:
Marta Gonçalves, Jin Young Kim, Yeseul Kim, Najaf Rubab, Narina Jung, Takeshi Asai, Sungchan Hong, Byung Mook Weon
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-11 (2022)
Abstract Droplet evaporation on porous materials is a complex dynamic that occurs with spontaneous liquid imbibition through pores by capillary action. Here, we explore water dynamics on a porous fabric substrate with in-situ observations of X-ray an
Externí odkaz:
https://doaj.org/article/97aadf66c844412eaabdefbcdcc38415
Autor:
Takeshi Asai, Sungchan Hong
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
Abstract Footballs are typically constructed with 32 panels. Recently, the number of panels has been successively reduced to 14, 8, and 6 panels, and official balls have been adopted with complex panel shapes and aerodynamics that differ from those o
Externí odkaz:
https://doaj.org/article/6d1f349bc59746e197ad7db2b3893fd8
Autor:
Sungchan Hong, Takeshi Asai
Publikováno v:
Applied Sciences, Vol 11, Iss 16, p 7204 (2021)
The surface structure of soccer balls, such as the number and shapes of the ball panels, has recently changed, and research on the aerodynamics and flight trajectories of new soccer balls is actively proceeding. However, these studies are focused on
Externí odkaz:
https://doaj.org/article/3bc747765f7347dd93003acdb158321a
Autor:
Sungchan Hong, Takeshi Asai
Publikováno v:
Applied Sciences, Vol 11, Iss 5, p 2200 (2021)
In cycling, air resistance corresponds to 90% of the resistance on the bicycle and cyclist and 70% of this is applied to the body of the cyclist. Despite research on postures that could reduce air resistance, few studies have been conducted on full-b
Externí odkaz:
https://doaj.org/article/4cfd9fe50bf440f6a534dfadff8b81c2
Autor:
Sungchan Hong, Takeshi Asai
Publikováno v:
Applied Sciences, Vol 10, Iss 17, p 5877 (2020)
Soccer balls have undergone dramatic changes in their surface structure that can affect their aerodynamics. The properties of the soccer ball surface such as the panel shape, panel orientation, seam characteristics, and surface roughness have a signi
Externí odkaz:
https://doaj.org/article/c6e7f19b9f3848209d46c9534d664634
Publikováno v:
Proceedings, Vol 49, Iss 1, p 143 (2020)
In this paper, we summarize our recent research work on soccer balls. Employing wind tunnels and analyses of simulated trajectories, we have gained an understanding of how various surface features influence soccer ball aerodynamics. Wind tunnels prov
Externí odkaz:
https://doaj.org/article/a0b0a9de6e0c485792c366e602a0d89b
Autor:
Takeshi Asai, Kaoru Kimachi, Richong Liu, Masaaki Koido, Masao Nakayama, John Eric Goff, Sungchan Hong
Publikováno v:
Proceedings, Vol 49, Iss 1, p 88 (2020)
The trajectory of a soccer ball, kicked with a spin to curve it into the goal, is strongly influenced by aerodynamic factors such as the Magnus force. Several studies using a wind-tunnel and high-speed cameras have investigated the Magnus force actin
Externí odkaz:
https://doaj.org/article/7fb6c9ea6a0449d7a9671386d90058bc
Publikováno v:
Applied Sciences, Vol 10, Iss 13, p 4543 (2020)
Various studies have been conducted on the aerodynamic characteristics of nonspinning and spinning soccer balls. However, the vortex structures in the wake of the balls are almost unknown. One of the main computational fluid dynamics methods used for
Externí odkaz:
https://doaj.org/article/e09bce81ddb8487db5c4cecb1f01068f