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희토류 첨가 광소재의 나노구조 : Dy 첨가 Ge-As-S 유리의 X-선 흡수 스펙트럼 분석
최용규,송재혁,신용범,허종,Choi, Yong-Gyu,Song, Jay-Hyok,Shin, Yong-Beom,Chernov, Vladimir A.,Heo, Jong 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.3
Dy $L_3$-edge XANES and EXAFS spectra of chalcogenide Ge-As-S glass doped with ca. 0.2 wt% dysprosium have been investigated along with some reference Dy-containing crystals. Amplitude of the white-line peak in XANES spectrum of the glass sample turns out to be stronger than that of other reference crystals, i.e., $DY_2S_3,\;Dy_2O_3\;and\;DyBr_3$. It has been verified from the Dy $L_3$-edge EXAFS spectra that a central Dy atom is surrounded by $6.7{\pm}0.5$ sulfur atoms in its first coordination shell in the Ge-As-S glass, which is relatively smaller than 7.5 of the $Dy_2S_3$ crystal. Averaged Dy-S inter-atomic-distance of the glass ($2.78{\pm}0.01{\AA}$) also turns out to be somewhat shorter than that of the $Dy_2S_3$ crystal ($2.82{\pm}0.01{\AA}$). Such nanostructural changes occurring at Dy atoms imply there being stronger covalency of Dy-S chemical bonds in the Ge-As-S glass than in the crystal counterpart. The enhanced covalency in the nanostructural environment of $Dy^{3+}$ ions inside the glass would then be responsible for optical characteristics of the $4f{\leftrightarrow}4f$ transitions of the dopants, i.e., increase of oscillator strengths and spontaneous radiative transition probabilities.
뇌성마비 아동의 신체 기능수준과 재활 목적 치료 강도가 신체 기능향상에 미치는 영향: 6개월간 추적연구
김부영 ( Bu-young Kim ),윤영주 ( Young-ju Yun ),신용범 ( Yong-beom Shin ),김수연 ( Soo-yeon Kim ),오태영 ( Tae-young Oh ) 대한물리의학회 2018 대한물리의학회지 Vol.13 No.1
PURPOSE: The purpose of this study was to find out the treatment patterns of Children with cerebral palsy, and to analyze the effect of physical function level and treatment intensity on improvement of physical function in children with cerebral palsy for six months. METHODS: Participants were 126 children (boys 83, girls 43) diagnosed cerebral palsy that the mean age was at 33months, ranged from 8 months to 77 months. We collected data related on demography and disable characteristic, treatment pattern using by questionnaire constructed ourselves for six months on caregivers. The treatment pattern includes, type, frequency, and institute of treatment. We performed the evaluation of Gross Motor Function Measurement (GMFM) and Pediatric Evaluation of Disability Inventory (PEDI) between pre and post for six months in order to find out improvement of physical function. We analyzed the effect of physical functional level measured by Gross Motor Functional Classification system, age, treatment intensity on physical function using by repeated measures ANOVA for SPSS PC ver. 22.0. RESULTS: The average of treatment frequency for physical therapy was 5.74 times per week, occupational therapy was 3.96 times, speech therapy was 2.96 times, treatment for accompanying disability was 3.12 times. Physical function level and age was significantly factors affecting improvement of physical function, there was no significant difference according to treatment intensity. CONCLUSION: We suggest that physical function and age might be important factors on improvement of physical function and professional rehabilitation team must consider the appropriate treatment type customized to each children.
전도성 고분자 나노임프린트 패턴 상의 HeLa 세포 배양
안준형(Junhyoung Ahn),박경숙(Kyungsook Park),이수옥(Suok Lee),정상희(Sanghee Jung),임형준(Hyungjun Lim),신용범(Yong-Beom Shin),이재종(JaeJong Lee) 대한기계학회 2017 大韓機械學會論文集B Vol.41 No.1
일반적인 세포 배양 기술은 평평한 표면에 세포 부착을 위한 화학적, 생화학적 표면처리를 하는 것이 기본이지만, 요즘 들어 마이크로나 나노 크기의 구조체를 형성하여 세포 부착을 하는 연구들이 많이 진행되고 있다. 본 연구에서는 전도성 고분자인 피롤과 나노임프린트 기술을 이용하여 300 nm 선 패턴과 150 nm 원기둥 패턴의 나노구조체 제작 후 대표적인 암세포인 HeLa 세포를 배양하여, 주사전자현미경과 공초점 현미경을 이용하여 세포의 부착 특성을 연구하였다. 상용 페트리 접시와 평면 피롤에서는 세포들이 부정형의 형태로 부착 및 배양되었지만, 선폭 300 nm 선패턴 상에서는 길이 방향으로 세포가 부착되고 세포 내의 핵과 액틴 역시 배열되어 있고, 지름 150 nm 원기둥 패턴 상에서는 단일 세포로 고정되고 세포 내 액틴은 방사상으로 나노구조체에 고정되어 있는 것을 확인할 수 있었다. In bioscience and biotechnology, the research of fundamental life mechanisms and their diseases caused by insufficiency is important. The study of a whole organism is difficult and sometimes impossible because of DNA, RNA, proteins, cellular organelles, various cells, and organs. Cell cultures can provide a simple method for researching cellular mechanisms and conditions, both in terms of physiological performance, and in response to chemical stimulation. According to conventional cell culture methodology, the flat surface is used with surface treatments for cell adhesion on the surface. Micro- and nanoscale patterns have been developed with chemical and biochemical modifications for cell immobilization. In this study, HeLa cell culture on nanostructures patterns was studied, including the 300 nm line and 150 nm pillar structures, using nanoimprint lithography and pyrrole as a biocompatible conducting polymer.