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Yoo Hwa-ik,Jung Sung-hoon,Lee Do-eun,Ahn Il-kyu,권오윤 한국전문물리치료학회 2022 한국전문물리치료학회지 Vol.29 No.3
Background: Pronated foot posture (PFP) contributes to excessive dynamic knee valgus (DKV). Although foot orthoses such as medial arch support (MAS) are widely and easily used in clinical practice and sports, few studies have investigated the effect of MAS on the improvement of DKV during stair descent in individuals with a PFP. Moreover, no studies reported the degree of improvement in DKV according to the severity of PFP when MAS was applied. Objects: This study aimed to examine the immediate effect of MAS on DKV during stair descent and determine the correlation between navicular drop distance and changes in DKV when MAS is applied. Methods: Twenty individuals with a PFP (15 males and five females) participated in this study. The navicular drop test was used to measure PFP severity. The frontal plane projection angle (FPPA) was calculated under two conditions, with and without MAS application, using 2-dimensional video analysis. Results: During stair descent, the FPPA with MAS (173.1° ± 4.7°) was significantly greater than that without MAS (164.8° ± 5.8°) (p < 0.05). There was also a significant correlation between the navicular drop distance and improvement in the FPPA when MAS was applied (r = 0.453, p = 0.045). Conclusion: MAS application can affect the decrease in DKV during stair descent. In addition, MAS application should be considered to improve the knee alignment for individuals with greater navicular drop distance.
Yoo, Seung Hwa,Lee, Sung-In,Joh, Han-Ik,Lee, Sungho THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.63 No.-
<P><B>Abstract</B></P> <P>A highly effective photocatalyst based on CdSe quantum dots (QDs) and TiO<SUB>2</SUB> nanoparticles well-dispersed on carbon nanofibers (CNFs), named as CdSe/TiO<SUB>2</SUB>/CNF was synthesized by simple successive ionic layer adsorption and reaction (SILAR) method on TiO<SUB>2</SUB>/CNF. It was verified by spectroscopic analysis that CdSe QDs were successfully synthesized and some aggregations and oxide phases existed in CdSe/TiO<SUB>2</SUB>/CNF. The photocatalytic activity of CdSe/TiO<SUB>2</SUB>/CNF was demonstrated for decomposition of methylene (MB) aqueous solutions. The tests were performed for different MB concentrations and light irradiation. It was found that CdSe/TiO<SUB>2</SUB>/CNF showed high photocatalytic activity under visible light irradiation and even high MB concentrations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> TiO<SUB>2</SUB>/CNF photocatalyst was synthesized by electrospinning and heat treatment. </LI> <LI> CdSe was deposited on TiO<SUB>2</SUB>/CNF by successive ionic layer adsorption and reaction. </LI> <LI> CdSe/TiO<SUB>2</SUB>/CNF showed high photocatalytic activity under visible light irradiation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Yoo, Seung Hwa,Joh, Han-Ik,Lee, Sungho Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.402 No.-
<P><B>Abstract</B></P> <P>Porous carbon nanofibers (PCNFs) with CNF branches (PCNF/bCNF) were synthesized by a simple heat treatment method. Conventional methods to synthesize this unique structure usually follow a typical route, which consists of CNF preparation, catalyst deposition, and secondary CNF growth. In contrast, our method utilized a one-step carbonization process of polymer nanofibers, which were electrospun from a one-pot solution consisted of polyacrylonitrile, polystyrene (PS), and iron acetylacetonate. Various structures of PCNF/CNF were synthesized by changing the solution composition and molecular weight of PS. It was verified that the content and molecular weight of PS were critical for the growth of catalyst particles and subsequent growth of CNF branches. The morphology, phase of catalyst, and carbon structure of PCNF/bCNF were analyzed at different temperature steps during carbonization. It was found that pores were generated by the evaporation of PS and the catalyst particles were formed on the surface of PCNF at 700°C. The gases originated from the evaporation of PS acted as a carbon source for the growth of CNF branches that started at 900°C. Finally, when the carbonization process was finished at 1200°C, uniform and abundant CNF branches were formed on the surface of PCNF.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous carbon nanofiber with bamboo-like carbon nanofiber branches (PCNF/bCNF) was synthesized by electrospinning and heat treatments. </LI> <LI> Unlike the conventional methods, PCNF/bCNF was readily synthesized by a one-step carbonization process. </LI> <LI> The morphology of PCNF/bCNF was easily controlled by changing the polystyrene amount, molecular weight and amount of iron precursor of the spinning solution. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Yoo, Seung Hwa,Park, Sejoon,Park, Youngkyu,Lee, Donggyun,Joh, Han-Ik,Shin, Ickgy,Lee, Sungho Elsevier 2017 Carbon Vol.118 No.-
<P>An electron-beam was irradiated on textile-grade polyacrylonitrile (PAN) fibers at various electron doses (200, 500, 1000, and 1500 kGy) prior to the thermal stabilization to fabricate carbon fibers (CFs). Textile-grade PAN fibers experienced superficial fusion between filaments during the thermal stabilization due to a large amount of co-monomer contents. However, electron-beam irradiation prior to thermal stabilization prevented the superficial fusion. Furthermore, the total stabilization time required to achieve the same degree of stabilization was effectively reduced as 64% by electron-beam irradiation. Various radicals were formed within textile-grade PAN fibers and they were recombined to crosslink with each other by gradually increasing the temperature. As a result, the elongation of irradiated fibers was suppressed and the glass transition temperature shifted to higher temperatures compared with the pristine fiber by increasing the electron dose. On the other hand, the onset and peak temperature of cyclization reaction for irradiated fibers were shifted to lower temperatures which indicated that the cyclization reaction was initiated at lower temperatures than pristine fibers. The tensile strength, Young's modulus, and strain-to-failure of resulting CFs were 1.83 +/- 0.23 GPa, 147.44 +/- 4.55 GPa, and 1.30 +/- 0.15%, respectively. (C) 2017 Elsevier Ltd. All rights reserved.</P>