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- 저자 : ( Hong Cheul Yeo ) (검색결과 6 건)
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윤희중,여홍철,김태삼 한국운동역학회 2001 한국운동역학회지 Vol.11 No.1
The purpose of this study was to investigate the effect of the kinematic factors about event of the Yeo2 motion on the Horse Vault. The subject in this study was 1 male gymnast to performance Yeo2 motion. Two video cameras were used to attain kinematic variables by phase. As a result, the following conclusion was drawn; 1. As the take-off time on the board was short, it appeared to increase horizontal and vertical velocity. In the motion, the flight apex height increased largely, too. 2. As the contact time on the board was short, it appeared to performance the air motion smoothly by increasing the horizontal distance and apex height. 3. The horizontal and vertical velocity in take-off on the board appeared increase horizontal distance and apex height. 4. To increase the apex height and horizontal distance, the body appeared to must be take the posture of vertical axis in take-off on the board.
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Effect of LiBiO2 on low-temperature sintering of PZT-PZNN ceramics
Hong Sung Cheul,Kim Shi Yeon,Yeo Dong-Hun,Shin Hyo-Soon,Park Zee Hoon,남산 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.5
In this study, the sintering characteristics of 0.69Pb(Zr 0.47 Ti 0.53 )O 3 -0.31Pb[(Zn 0.4 Ni 0.6 ) 1/3 Nb 2/3 ] (PZT-PZNN) ceramics after the addition of LiBiO 2 were studied. This addition lowered the sintering temperature from 1150 to 900 °C. The crystal structure changed from tetragonal to rhombohedral as the additive content increased by 0.7%. The polarization of the sintered specimen was conducted at an electric fi eld of 3 kV/mm. When 0.7 wt% of LiBiO 2 was added and sintered at 900 °C, the piezoelectric constant ( d 33 ) was 602 pC/N; moreover, the electromechanical coupling coefficient ( k P ), sintered density, and Curie temperature ( T c ) at 1 kHz were 66.3%, 7.99 g/cm 3 , and 252.8 °C, respectively. When 0.7 wt% of LiBiO 2 was added, the PZT-PZNN ceramic showed an increased strain curve of 0.118% at 2 kV/mm. The interdiffusion between the copper (Cu) electrode and ceramic material was not observed in the scanning electron microscopy (SEM) results; thus, the possibility of manufacturing an actuator using a Cu electrode using a novel composition was confirmed. The actuator displacement with the voltage 400 V was 1.2 μm. The thickness of the multi-layered actuator was 1 mm. Through this, the possibility of manufacturing a multi-layered actuator with a Cu electrode was confirmed through the composition of 0.69PZT-0.31PZNN (LiBiO 2 0.7 wt%).
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De novo assembly and characterization of transcriptome in the medicinal plant Euphorbia jolkini
Neha Samir Roy,In‑hye Lee,Jung‑A Kim,Rahul Vasudeo Ramekar,Kyong‑Cheul Park,Nam‑il Park,Joo‑Hong Yeo,Ik‑Young Choi,Soonok Kim 한국유전학회 2020 Genes & Genomics Vol.42 No.9
Background Euphorbia jolkini, a medicinal herb that grows on the warm beaches in Japan and South Korea, is known to be used for traditional medicines to treat a variety of ailments, including bruises, stifness, indigestion, toothache, and diabetes. Objective It is to analyze the whole transcriptome and identify the genes related to the phenylpropanoid biosynthesis in the medicinally important herb E jolkini. Methods Paired-end Illumina HiSeq™ 2500 sequencing technology was employed for cDNA library construction and Illumina sequencing. Public databases like TAIR (The Arabidopsis Information Resource), Swissprot and KEGG (Kyoto Encyclopedia of Genes and Genomes) were used for annotations of unigenes obtained. Results The transcriptome of E. jolkini generated 139,215 assembled transcripts with an average length of 868 bp and an N50 value of 1460 bp that were further clustered using CD-HIT into 93,801 unigenes with an average length of 847 bp (N50- 1410 bp). Sixty-three percent of the coding sequences (CDS) were annotated from the longest open reading frame (ORF). A remarkable percentage of unigenes were annotated against various databases. The diferentially expressed gene analysis revealed that the expression of genes related to the terpenoid backbone biosynthesis pathway was higher in the fowers, whereas that of genes related to the phenylpropanoid biosynthesis pathway was both up- and downregulated in fowers and leaves. A search of against the transcription factor domain found 1023 transcription factors (TFs) that were from 54 TF families. Conclusion Assembled sequences of the E. jolkini transcriptome are made available for the frst time in this study E. jolkini and lay a foundation for the investigation of secondary metabolite biosynthesis.
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Anti-oxidative and Photo-protective Effects of Coumarins Isolated from Fraxinus chinensis
Lee, Bum-Chun,Lee, So-Yong,Lee, Hwa-Jeong,Sim, Gwan-Sub,Kim, Jin-Hui,Kim, Jin-Hwa,Cho, Young-Ho,Lee, Dong-Hwan,Pyo, Hyeong-Bae,Choe, Tae-Boo,Moon, Dong-Cheul,Yun, Yeo-Pyo,Hong, Jin-Tae 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.10
Free radicals and reactive oxygen species (ROS), which are generated by UV irradiation, may cause serious injury to skin cell membranes, DNA and functional proteins. In addition, these agents stimulate the expressions of matrix metalloproteinases (MMPs), which can degrade most components of the extracellular matrix (ECM), including collagen. In order to develop new anti-photoaging agents, five major components from the extract of Fraxinus chinensis extract (FCE) were identified. Two of the major components of FCE were found to be esculin (11.2%) and esculetin (1.9%). FCE ($IC_{50}:\;50.0{\mu}g/mL$ 1, 1-diphenyl-2-picrylhydrazyl (DPPH); $19.8{\mu}g/mL$, superoxide anion radical) and esculetin ($IC_{50}:\;2.1{\mu}g/mL$ DPPH; $0.6{\mu}g/mL$, superoxide anion radical) showed strong antioxidative activities. Of the compounds tested, esculetin showed the strongest scavenging activity against DPPH radicals, followed by superoxide anions from the xanthine/xanthine oxidase system. The intracellular ROS scavenging activity showed that oxidation of 5-(6-)-chloromethyl-2', 7'-dichlorodihydrofluorescein diacetate ($CM-H_2DCFDA$) was effectively inhibited by esculetin, with potent free radical scavenging activity was also shown in UVB-irradiated human dermal fibroblasts (HDFs). Moreover, treatment of UVA-irradiated HDFs with esculetin resulted in dose-dependent decreases in the expression levels of MMP-1 mRNA and protein. From these results, FCE and one of its components, esculetin, were predicted to be potentially useful as ingredients in cosmetics for protecting against photoaging.
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