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Boron 첨가량이 평면광회로용 실리카 박막의 UV 감광성에 미치는 영향
권기열,조승현,신동욱,송국현,이낙규,나경환,Kwon Ki Youl,Cho Seung-Hyun,Shin Dong Wook,Song Kug-Hyun,Lee Nak Kyu,Na Kyoung Hwan 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.11
본 연구에서는 PLC 소자용 브래그 격자에 적용되는 재료인 Ge, B 등이 다량 첨가되어 있는 실리카 유리에서 발생하는 감광성(photosensitivity)을 조사하고 감광성의 발현 기구를 연구하였다. 관찰된 굴절률 변화의 최대값은 약 $10^{-3}$ 정도였으며 열처리 과정을 거치기 전후에 이러한 굴절률의 변화 양상이 변화하는 것을 관찰하였다. 이와 같은 굴절률의 변화를 UV 흡수도와 라만 스펙트림을 이용하여 본 연구의 시편에서 발생하는 감광성의 기구를 규명한 결과 굴절률 변화 요인이 유리 내에 존재하는 내부응력과 첨가된 B에 의하여 증대된 고밀화 과정에서 발생하는 현상임을 밝혔다. In this study, photosensitivity dynamics in SiO$_2$ glass with the composition similar to that of silica Planar Lightwave Circuit (PLC) devices was investigated as a fundamental study prior to the device fabrication. Silica bulk glasses with similar composition to the core layer of PLC devices were prepared with variable composition of B$_2$O$_3$. The photosensitivity in boron and germanium co-doped SiO$_2$ glass yields refractive index change $\Delta$n as high as 10$\^$-3/. However such index modulation disappeared after annealing. From the result of annealing experiment and W absorption / Raman spectra, we conclude the compaction model is applicable to our glass system.
Vanadium 화합물이 조골세포주 MC3T3-E1에 미치는 영향에 관한 연구
권기열(Ki-Youl Kwon),정규림(Kyu-Rhim Chung) 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.1
Vanadium is an essential trace element but has not been identified with a specific biogical role. To study the direct effects of vanadium on osteoblast, we incubated murin osteoblast-like (MC3T3-E1) cells with various concentration of vanadium oxide & sodium orthovanadate. This study was designed to investigate the effect of vanadium on DNA synthesis, alkaline phosphatase (ALP) activity, cAMP formation responsive to parathormone(PTH) and type I α 2 collagen ribonucleic acid (mRNA) level in murin osteoblast-like (MC3T3-E1) cells. The cells were cultured in a -minimal essential medium(α -MEM) supplemented with 10% fetal bovine serum (FBS) and then changed to 0.1% FBS with various concentration of vanadium oxide & sodium orthovanadate. Quiescent cultured MC3T3-E1 cells incubated for 24 hours with 2,5,10,15,20 µM vanadium oxide incorporated [³H]Thymidine; every concentration showed increases in [³H]Thymidine incorporations dose dependant manner, the greatest response occurred at 20µM. Quiescent cultured MC3T3- E1 cells incubated for 3days with 2,5,10,15,20 µM vanadium oxide, for 2 days with sodium orthovanadate and alkaline phosphatase was assayed with disodium phenyl phosphate as substrate. Vanadium oxide increased the alkaline phosphatase content in MC3T3- E1 cells at 2 µM & 6µM; the greatest response occurred at 2µM. But decreased at other content. sodium orthovanadate increased alkaline phosphatase content in MC3T3-E1 cells at all concentration ; the greatest response occurred at 4µM. Quiescent cultured MC3T3- E1 cells incubated for 3days with 5,10µM vanadium oxide, with 5,8µM sodium orthovanadate and cAMP formation was measured by Radioimmunoassay(RIA). Vanadium oxide & sodium orthovanadate showed the tendency of inhibitory effects on cAMP responsiveness to PTH in MC3T3-E1 cells. Quiescent cultured MC3T3-E1 cells incubated for 24hours with 10,20µM vanadium oxide, with 5,10µM sodium orthovanadate and Type I α2 collagen ribonucleic acid (mRNA) expression was studied by Northern blot analysis. Northern blot analysis of vanadium oxide treated cells showed decreasing effects 0& sodium orthovanadate revealed increasing effects in type I &2 collagen ribonucleic acid (mRNA) level.
부정교합의 유형에 따른 두개저와 하악골의 형태에 관한 연구
權奇烈,鄭圭林,李起受 대한치과교정학회 1986 대한치과교정학회지 Vol.16 No.1
This study was designed to investigate the variation of mandibular pattern and cranial base and their association in the cranioofacial malocclusion. The material was the 165 cephalometric radiographs taken from craniofacial malocclusion. The sample was devided into two groups by age child group aged from 10 to 13 years and adult group aged over 18 years, and each group was devided into 3 types of malocclusion; classⅠ, ClassⅡ div. 1 and ClassⅢ malocclusion. Child group consist of 35 sample and adult group consist of 20 samples in each malocclusion type. Various angular and linear measurements on the cephalometric radiographs were recorded and statistically analyzed. The results of the study were as follows; 1. The cranial base angle was largest in ClassⅡ div. 1 malocclusion and smallest in ClassⅢ malocclusion. 2. The anterior cranial base length was largest in ClassⅡ div. 1 malocclusion but posterior cranial base length did not show statistical difference. 3. The mandibular body length of ClassⅢ malocclusion was larger than those of ClassⅠ and ClassⅡ div. 1 malocclusion in the adult group but did not shown difference in the child group. The ramus height of ClassⅢ malocclusion was larger than those of ClassⅠ and ClassⅡ div. 1 malocclusion in the child and adult group, but there were no difference between ClassⅠ and ClassⅡ div. 1 malocclusion. 4. The mandibular position was showed low correlation with the cranial base angele.