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금속의 구조가 Metal-assisted etching을 이용한 실리콘 나노선 제작에 미치는 영향
김정길 한국물리학회 2021 새물리 Vol.71 No.12
Metal-assisted etching (MaE) is one of the most promising etching methods to fabricate silicon nanowires (Si NWs). Here, the effect of noble-metal structure on Si NW fabrication using MaE is investigated. First, two kinds of patterning method are used to fabricate hole arrays in the Au mesh as a catalyst. One is the preparation of the Au mesh by using an anodic aluminum oxide (AAO) disk, and the other is based on the patterning of polystyrene (PS) beads. The Au mesh prepared by using AAO has hole arrays with a smooth edge structure while the other Au mesh patterned by using PS beads shows a rough edge structure of hole arrays. Si NWs are fabricated by using MaE with each different Au mesh. As a result, Si NWs fabricated by using MaE based the AAO disk as a catalyst were found to show a smooth surface that corresponds to the hole structure of the Au mesh. On the other hand, the surface of Si NWs fabricated by using MaE based on PS beads is quite rough with vertically striped structures. 실리콘 나노선을 제작하기 위해 가장 많이 사용하는 방법 중 하나인 metal-assisted etching에서 촉매로작용하는 귀금속의 구조가 제작된 나노선의 표면 구조에 미치는 영향을 알아봤다. 먼저 실리콘 기판을나노선 모양으로 식각하기 위하여 구멍 어레이 구조를 포함한 금 박막을 두가지 방법으로 제작하였다. 두가지 제작법으로는 크게 양극 산화 알루미늄 (Anodic aluminum oxide, AAO) 을 패터닝 기판으로사용하는 방법과, 폴리스티렌 (Polystyrene, PS) 를 이용한 패터닝 방법을 택했다. AAO를 이용하여제작한 금 촉매의 구멍은 모양이 원형에 가까우며 경계면의 거칠기가 매우 낮았다. 반면, PS를 이용하여제작한 금 촉매의 구멍은 경계면에 거칠기가 존재하였다. 각각의 방법으로 준비한 금 박막을 촉매로사용하여 metal-assisted etching으로 제작한 나노선을 제작하였다. AAO를 기반으로 하는 실리콘나노선의 표면은 매우 매끈한 구조를 보였으며 표면 거칠기가 거의 존재하지 않음을 확인할 수 있었다. 반면 PS를 기반으로 하는 실리콘 나노선의 표면은 수직 줄무늬와 함께 상대적으로 높은 거칠기를 보였다.
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金貞吉 圓光大學校大學院 1981 學位論叢 Vol.6-2 No.-
The researcher integrated the published findings on the violas and experimented with the sprouting of cleistogamous flowers in 1978. From spring to autumn 1979, he collected fifteen species of wild violas from ten places from Haenam in the south to Gapeung in the north in South Korea, transplanted them, and observed their ecological adaptation. This study attempted to observe the blooming and propagating of those fifteen species of violas in spring and autumn. The findings are summarized as follows : 1. The seeds of cIeistogamous flowers of the violas sprouted about 90% in two or three weeks under conditions where the average temperature difference was 30℃ between day and night, and under a natural condition where there was a strong intensity of light (table2). 2. The stem-cut violas rooted out in three weeks(fig. 1). 3. When the roots of violas were cut, a definite bud generally sprouted from the atop of the root cut places, and small roots formed from the bottom of them (fig. 2, 3). 4. When the growth of the viola was not good in the spring or autumn, the flowers bloomed. When the growth of the viola was good under conditions of high temperature and dampness in the summer, only cleistogamous flowers bloomed (table3, 4). 5. When the day length of the flowering period in spring is compared with that in autumn, the day length in spring is longer(30 minutes) than that in autumn, and the temperature in spring is Iower(6.3℃)than that in autumn. Therefore, the height and flower size of the viola is smaller in spring than in autumn, and until the beginning of May, flowering is continued. On the contrary, the height and the flower size of the viola is larger in autumn than in spring, but, though flowering is continued until its dormant period, the number of the flowers is fewer in autumn(table 3,4). 6. The shade-short day-species of violas do not grow well in sunny places but bloom in a short-day length situationt(12:15 hrs in the spring, 11:30 hrs in autumn), and in a low temperature situation (8.5℃ in the spring, 16.0℃ in autumn) (table 4). 7. The half shade-short day-species of viola grow comparatively well in a sunny place and bloom under the same conditions of day length and temperature as the sunny-long day-species in spring, but bloom under the different conditions of a shorter day length and the lower temperature in autumn (table 4). 8. The shade-long day-species of viola bloom ealier than the sunny long day-species in spring and go to dormant in the summer, and they begin to grow again in September. Some of them do not bloom in autumn (table 4). 9. The sunny-long day-species grow well in a sunny place and when compared with other species, bloom well under conditions of long day light and high temperature in both spring and autumn(12:4 Ohrs in spring, 12:30 hrs in autumn. 12℃ in spring, 20℃ in autumn). Some of the species do not bloom (table 4). Their heights are long and they have many flowers. Therefore they are valuable as ornamental flowers. 10. The flowering of the viola is stimulated or accelerated by reducing their roots or through transplanting.
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김정길 경기대학교 2000 論文集 Vol.44 No.1
대학교수의 연구성과물을 정성평가(定性評價)하는 일은 노벨상 수상자의 학문적 능력과 인격과 경험에 버금가거나 그 이상의 능력을 가진 원로학자들을 초빙하여 정성평가위원회(定性評價委員會)를 구성하는 일이 전제가 되어야 한다. 정량평가는 사실을 판단하는데 적용될 뿐이고, 가치는 정성평가 방법에서만이 평가될 수 있다. Heisenberg의 말처럼 "마음(mind)은 정보(information) 이상의 것이어야 하고, 사랑(love)은 성적인 것(sexuality) 이상의 것이어야 하며, 학문(science)은 실증적 자료를 수집, 분석(analysis)하는 것 이상의 것이어야 한다."(31)는 가치를 우리 사회과학자들과 자연과학자들은 가슴과 영혼 속에 깊이 간직하기를 함께 약속하자.
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김정길 東義大學校 産業技術開發硏究所 1997 産業技術硏究誌 Vol.11 No.-
Generally, haunch structure has great economical effects on the buildings, because not only is reduced deflection and bending moment of beam center but also can design section smaller. Accordingly, the purpose on this study is to propose efficient haunch size and the approximate formular for bending moment and by finite element analysis and simple experiment under the assumption of 25 models with change of haunch size, and is to study bending stress by change strength ratio.
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