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곽호원,문병연,조현국 대한시과학회 2007 대한시과학회지 Vol.9 No.2
고주따유도가열방식을 이용하여 조건을 변화시키며 티타늄을 맴질한 후 인장시험을 하였 다. 맴질온도가 증가할수록 인장강도도 증가하였으며 960"(; 에서 가장 큰 강도를 나타내었으 나 용도가 증가할수록 점차적으로 강도가 감소하는 것으로 나타났다, 960"(; 에서 햄질한 시 면의 경우 가장 강한 392,25 MPa의 인장강도를 나타내었다, Ar가스분출속도에 따른 인장강 도 측정에서는 분출속도에 대하여 비례적으로 증가하다가 25Q/min에서부터는 거의 일정한 인장강도 398,65 MPa를 보였다. 티타늄 모재와 은납(53Ag-28Cu -19Zn) 사이의 납접계면과 납재부에서는 다수의 균열과 기공이 관찰되었으며, 인장응력이 작용할 때 파절은 댐질부위에 서 일어났다, AES을 이용하여 모재부, 납접계면, 납재부 간의 화학적 조성비를 분석한 결과, 은납이 티타늄 측으로 확산되어가는 양상이 조사되었다. We studied on the high temperature brazing process of the titanium frame of spectacles using the tensile test apparatus. The titanium rods, 50 mm in length and 3 mm in diameter, were polished with #2000 emery paper and brazed using the high frequency induction brazing method. Morphologies and chemical compositions of pure titanium surface were observed using SEM and EDX. The chemical compositions were observed using AES in the brazed seam, brazed interface, base metal. The results obtained from this study were summarized as follows. The tensile strength of titanium frame was measured 392.25 MPa at the brazing temperature 960oC. η1e tensile strength of titanium frame was measured 398.65 MPa at the Ar gas injection speed 25 Umin, temperature 960oC. AES data for the brazed interface region showed that the diffusion of Ag, Cu and Zn occurred to the titanium.
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곽호원,문병연,조현국 대한시과학회 2007 대한시과학회지 Vol.9 No.2
We studied on the high temperature brazing process of the titanium frame of spectacles using the tensile test apparatus. The titanium rods, 50 mm in length and 3 mm in diameter, were polished with #2000 emery paper and brazed using the high frequency induction brazing method. Morphologies and chemical compositions of pure titanium surface were observed using SEM and EDX. The chemical compositions were observed using AES in the brazed seam, brazed interface, base metal. The results obtained from this study were sumrnarized as follows. The tensile strength of titanium frame was measured 392.25 MPa at the brazing temperature 96o·c. The tensile strength of titanium frame was measured 398.65 MPa at the Ar gas injection speed 25 Q/min, temperature 96o·c. AES data for the brazed interface region showed that the diffusion of Ag, Cu and Zn occurred to the titanium.
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곽호원,김형수,노병호,홍성일 한국안광학회 2017 한국안광학회지 Vol.22 No.2
Purpose: To compare the convergence accommodation to convergence (CA/C) ratios with varying prismatic powers and base among three clinical methods. Methods: 52 young adult subjects (mean age of 21.68±2.57 years, 32 males and 20 females) with normal binocular vision participated in this study. After measure diatance and near binocular function include phoria test and accomodation, accommodative response was measured using the open-field autorefractor (NVision K-5001, Shin- Nippon, Japan), the Streak Retinoscope (WEL18245, Welch Allyn, America) and the BCC (binocular crossed cylinder). While accommodative response was measuring, prismatic powers and base were also varied. CA/C ratios was calculated base on the accommodative response. Results: Accommodative response were high in the order of BCC, AR, and Nott method at all prismatic power and base. As the prismatic power was increased from the prismatic base of the BI to the BO, accommodative response was also gradually increased. The mean of the CA/C ratios in all prismatic powers and bases was higher in the order of BCC, AR, and Nott method. For persons with normal binocular function, the mean of the CA/C ratios measured by 6 Δ, BI was 0.095±0.012 D/Δ in BCC, 0.093±0.012 D/Δ in AR, 0.088±0.009 D/Δ in Nott method, respectively. The mean and standard deviation for 6 Δ, BI was the smallest in all methods and there was no statistically significant difference (F = 2.532, p = 0.085). Conclusions: When the CA/C ratios was measured by the Nott method, the most consistent result was obtained regardless of the prismatic power and the base. 목적: 본 연구에서는 세 가지 CA/C 비 검사법에서 프리즘 굴절력과 기저방향을 다양하게 변화시켰을 때의 CA/C 비를 측정값을 비교해 보고자 하였다. 방법: 양안시 기능적 문제가 없는 20대 대학생 52명(평균 21.68±2.57세, 남자32 명, 여자 20 명)을 대상으로 주시거리 40 cm에서 원, 근거리 사위검사를 포함한 양안시 기능 검사와 조절력 검사를 진행 후 개방형 자동굴절력계 (NVision K-5001, Shin-Nippon, Japan), 검영기(Streak Retinoscope WEL18245, Welch Allyn, America) 그리고 BCC (binocular crossed cylinder)를 이용하여 프리즘 굴절력과 기저방향에 따른 조절반응량을 측정하여 CA/C 비를 평가하였다. 결과: 검사법간 조절반응량은 모든 프리즘 굴절력과 기저방향에서BCC 측정법, AR 측정법, Nott 측정법의 순으로 크게 나타났으며 BI의 프리즘 기저방향에서 BO 방향으로 프리즘굴절력이 증가할수록 점차 증가하는 선형관계를 나타냈다. 모든 프리즘 굴절력과 기저방향에서 평균 CA/C 비는BCC 측정법, AR 측정법, Nott 측정법 순으로 크게 나타났다. 정상 양안시 기능을 가진 사람의 경우 6 Δ, BI으로측정된 CA/C 비의 평균은 BCC 측정법 0.095±0.012 D/Δ, AR 측정법 0.093±0.012 D/Δ, Nott 측정법 0.088±0.009 D/Δ 순으로 높게 평가되었으며 모든 검사법 사이에서 평균과 표준편차가 가장 적었고 통계적으로 유의한 차이를 보이지 않았다(F = 2.532, p = 0.085). 결론: 모든 측정법 중 Nott 측정법으로 CA/C 비를 측정했을 때 프리즘 굴절력과 기저방향에 관계없이 가장 일정한 결과를 얻을 수 있었다.
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Si(111)표면 위에서 알칼리 금속의 흡착에 관한 연구
곽호원,손정식 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(A)
The adsorption system is also a fundamental interest because of its unique electronic properties such as measurement of work function change, adatom-core level shift. The effects of adsorption and desorption of alkali-metals on Si(111) surface were investigated by using AES and FHEED-system. It was found that the growth mode of K on Si surface was layer by layer growth and the saturation coverage was 2.0 ML at room temperature. Alkali-metals such as Li and K, adsorption and desorption processes on Si surface according to the alkali-metal thickness and substrate temperatures were accurately defined. By applying the isothermal desorption method, the desorption energies of Li/Si(111) and K/Si(111) surfaces was measured. On Li/Si(111) and K/Si(111) surfaces, the desorption energies were 3.07eV, 2.19eV respectively.
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