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889 results on '"Park, Jin Seok"'

1. PyFR v2.0.3: Towards Industrial Adoption of Scale-Resolving Simulations

Author

Witherden, Freddie D., Vincent, Peter E., Trojak, Will, Abe, Yoshiaki, Akbarzadeh, Amir, Akkurt, Semih, Alhawwary, Mohammad, Caros, Lidia, Dzanic, Tarik, Giangaspero, Giorgio, Iyer, Arvind S., Jameson, Antony, Koch, Marius, Loppi, Niki, Mishra, Sambit, Modi, Rishit, Sáez-Mischlich, Gonzalo, Park, Jin Seok, Vermeire, Brian C., and Wang, Lai

Subjects
Physics - Computational Physics
Abstract

PyFR is an open-source cross-platform computational fluid dynamics framework based on the high-order Flux Reconstruction approach, specifically designed for undertaking high-accuracy scale-resolving simulations in the vicinity of complex engineering geometries. Since the initial release of PyFR v0.1.0 in 2013, a range of new capabilities have been added to the framework, with a view to enabling industrial adoption of the capability. This paper provides details of those enhancements as released in PyFR v2.0.3, explains efforts to grow an engaged developer and user community, and provides latest performance and scaling results on up to 1024 AMD Instinct MI250X accelerators of Frontier at ORNL (each with two GCDs), and up to 2048 NVIDIA GH200 GPUs on Alps at CSCS.

Published
2024

39. Quality Indicators of Endoscopic Retrograde Cholangiopancreatography in Korea

Author

Chon, Hyung Ku, primary, Kim, Ki-Hyun, additional, Song, Tae Jun, additional, Ahn, Dong-Won, additional, Lee, Eaum Seok, additional, Lee, Yun Nah, additional, Lee, Yoon Suk, additional, Jeon, Tae Joo, additional, Park, Chang Hwan, additional, Cho, Kwang Bum, additional, Lee, Dong Wook, additional, Park, Jin-Seok, additional, Yoon, Seung Bae, additional, Chung, Kwang Hyun, additional, Lee, Jin, additional, and Choi, Miyoung, additional

Published
2024
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44. High-Order Implicit Large-eddy Simulations of Flow around a Projectile using PyFR

Author

Park, Jin Seok, speaker

Abstract

In this talk I will demonstrate how PyFR can be applied to simulate three challenging unsteady flow around projectile. The first problem is subsonic flow after projectile base, which yields a significant portion of drag of projectile. The numerical results are compared with the experiments in terms of aerodynamic drag, pressure distribution on base and separation bubble size. The second problem is to simulate so-called 'phantom-yaw', asymmetric shedding of vortices at high angle of attack. The distinct instability modes, which were witnessed in the experiments, are reproduced in simulations and flow structures of each mode are compared. The last problem is laminar separation bubble on Low-Reynolds Number airfoil. The numerical results are compared with the experiments in terms of aerodynamic forces and transition of separation bubbles along the angle of attack is witnessed.

Published
2021
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47. Subcritical Water Extraction of Undaria pinnatifida : Comparative Study of the Chemical Properties and Biological Activities across Different Parts.

Author

Park, Jin-Seok, Han, Ji-Min, Park, Sin-Won, Kim, Jang-Woo, Choi, Min-Seo, Lee, Sang-Min, Haq, Monjurul, Zhang, Wei, and Chun, Byung-Soo

Abstract

The subcritical water extraction of Undaria pinnatifida (blade, sporophyll, and root) was evaluated to determine its chemical properties and biological activities. The extraction was conducted at 180 °C and 3 MPa. Root extracts exhibited the highest phenolic content (43.32 ± 0.19 mg phloroglucinol/g) and flavonoid content (31.54 ± 1.63 mg quercetin/g). Sporophyll extracts had the highest total sugar, reducing sugar, and protein content, with 97.35 ± 4.23 mg glucose/g, 56.44 ± 3.10 mg glucose/g, and 84.93 ± 2.82 mg bovine serum albumin (BSA)/g, respectively. The sporophyll contained the highest fucose (41.99%) and mannose (10.37%), whereas the blade had the highest galactose (48.57%) and glucose (17.27%) content. Sporophyll had the highest sulfate content (7.76%). Key compounds included sorbitol, glycerol, L-fucose, and palmitic acid. Root extracts contained the highest antioxidant activity, with IC50 values of 1.51 mg/mL (DPPH), 3.31 mg/mL (ABTS+), and 2.23 mg/mL (FRAP). The root extract exhibited significant α-glucosidase inhibitory activity with an IC50 of 5.07 mg/mL, indicating strong antidiabetic potential. The blade extract showed notable antihypertensive activity with an IC50 of 0.62 mg/mL. Hence, subcritical water extraction to obtain bioactive compounds from U. pinnatifida, supporting their use in functional foods, cosmetics, and pharmaceuticals is highlighted. This study uniquely demonstrates the variation in bioactive compound composition and bioactivities across different parts of U. pinnatifida, providing deeper insights. Significant correlations between chemical properties and biological activities emphasize the use of U. pinnatifida extracts for chronic conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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