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Your search keyword '"Hyung-Uk Choi"' showing total 5 results
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5 results on '"Hyung-Uk Choi"'

1. Variation in the Occurrence of Salp and Doliolid Assemblages in the Northeastern East China Sea from 2019 to 2023

Author

Hyung-Uk Choi, Young Seok Jeong, Seohwi Choo, and Ho Young Soh

Subjects
gelatinous zooplankton, northeastern East China Sea, thaliacean, salp, doliolid, seasonal variation, Naval architecture. Shipbuilding. Marine engineering, VM1-989, Oceanography, GC1-1581
Abstract

This study characterizes the distribution of salp and doliolid species in the northeastern East China Sea during spring and autumn and identifies the factors that regulate their abundance. The data were collected over four years (2019–2023, except 2020). During the survey period, the Tsushima Warm Current Surface and Bottom (TWCS and TWCB, respectively) and Yellow Sea Cold Bottom Water were influential in spring, while the Changjiang Diluted Water, Coastal Water, TWCS, and TWCB were dominant in autumn. The mean sea surface temperature (SST) and sea surface salinity (SSS) in spring and the mean SST in autumn statistically decreased (p < 0.05), while the mean SSS in autumn statistically increased (p < 0.05). The spatial distribution of salp and doliolid species remained consistent in spring and autumn, although the dominant assemblage shifted seasonally. Spring was predominantly characterized by an abundance of salp species, whereas doliolid species were dominant in autumn, with their distribution and abundance influenced by different environmental factors such as temperature and salinity in spring and food availability in autumn. Our results provide valuable data on the factors affecting the presence of salp and doliolid species in the northeastern East China Sea.

Published
2024
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3. Effect of abdominal binder after laparoscopic cholecystectomy on enhanced recovery: a randomized controlled trial

Author

Hyung Uk, Choi, Sang Hun, Park, Eo Jin San, Lee, Kyung Uk, Jung, Jun Ho, Shin, and Sung Ryol, Lee

Abstract

The purpose of this randomized controlled trial was to compare the effects of abdominal binder after laparoscopic cholecystectomy.From August to December 2020, 66 patients who were set to undergo cholecystectomy were selected for a prospective trial at Kangbuk Samsung Hospital, Seoul, Republic of Korea, and their clinical characteristics and postoperative surgical outcomes were evaluated. Among 66 patients, 33 patients belong to the abdominal binder group and the other 33 patients belong to the control group.The average hospital stay was 2.46 ± 1.29 days, and was not significantly different between the two groups. The average postoperative pain score (visual analogue scale, 0-10) 12, 24, and 48 hours after surgery were not significantly different. However, the degree of comfort score was significantly higher for the control group patients (2.56 vs. 3.33,No postoperative recovery benefit and no reduction in hospital stay was found in patients who used an abdominal binder while undergoing laparoscopic cholecystectomy. Statistically, between the group that used the binder and the one that did not, no significant differences in surgical outcome nor postoperative outcome were observed. The only exception was that the degree of comfort score was significantly higher in the control group. Therefore, in terms of patient benefit and convenience, wearing an abdominal binder after laparoscopic cholecystectomy is not recommended.

Published
2021

4. A Simple CNT Supported Electrocatalysts Preparation Method by Electro-Reduction

Author

Dong-lae Kim, Hyun-Jong Kim, Tae Wook Lim, Young-Hwan Chu, M.K. Han, Heekyung Bang, June-Seok Cho, and Hyung-Uk Choi

Subjects
Materials science, Nanoparticle, Hydrochloric acid, Carbon nanotube, Electrochemistry, Catalysis, law.invention, Preparation method, chemistry.chemical_compound, chemistry, Chemical engineering, law, Hydroxide, Ethylene glycol
Abstract

We developed a novel preparation method of carbon nanotube supported catalysts based on the electrochemical reduction process. Our method doesn't require any organic solvents and additives such as ethylene glycol and surfactants because this is water based process. First, Pt hydroxide nanoparticles are deposited on the hydrochloric acid treated carbon nanotube to prepare so-called pre. Pt/CNT sample. The catalysts with various wt% are prepared through the reduction by applying the potential to our pre. Pt/CNT samples. The obtained catalysts show higher electrochemical active surface area than the commercial Pt/C catalysts.

Published
2008
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