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국양 선문대학교 첨단과학기술연구소 2001 첨단과학기술연구소 논문집 Vol.5 No.-
1980년 주사형 터널링현미경의 발명으로 인하여 나노미터 크기의 세상을 직접 관측할 수 있게됨으로 새로운 나노과학과 기술의 세계가 열리게 되었다. 나노과학은 물리학, 화학, 생물, 전자공학, 전산과학 사이에서 새로운 학문분야로 태어나 인류의 궁극적 기술의 한계에 도달할 수 있음을 보여주고 있다. 이 강연에서는 현재 전세계적으로 연구되고 있는 나노과학의 현재와 미래를 보여주고자 한다.
Functionalized One-Dimensional Devices and Their Interconnections
국양,H.J. Chung,김하진,이진환 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
The current CMOS (complementary metal oxide semiconductor) technology faces technical and economic difficulty in further miniaturization. Some predict that 1-dimensional structures may be used as alternative functional devices. New device structures may include 3-terminal field-effect transistors or quantum wells aligned in a 1-dimensional chain. We propose a method for constructing self-assembled, multiple quantum dots of $<$ 10 nm in a semiconducting carbon nanotube, causing a spatial modulation of the band gap. We explain the limits of the current CMOS logic and suggest possible improvement.
국양(Y. Kuk),Y. Hasegawa,H. Tokumoto 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.1
NiSi₂(111)을 Si(111) 표면 위에 증착하여 그 구조를 STM으로 연구하였다. 실리사이드는 그 표면이 (1×1)의 구조를 띠고 여분의 trimer를 흡착 분자 구조로 가짐을 관찰하였다. 이 trimer로부터 실리사이드의 두 가지 구조 A, B를 구별할 수 있었다. 표면에 관착된 결함으로부터 표면구조는 내부와 같음을 보았다. The structure of NiSi₂/Si(111) has been studied by scanning tunneling microscopy. Atomically resolved STM images of this surface show an unreconstructed (1×1) structure with Si adatoms that tend to form trimers. The trimer can be used as a marker to differentiate type A and B interfaces. From the observed various defects, the surface is proven to be a simple bulk terminated layer.
시간경과에 따른 치면열구전색체의 외형변화와 치아우식발생과의 관계
국중기,양정승,임선아,성진효,김동기 대한구강보건학회 2001 大韓口腔保健學會誌 Vol.25 No.4
We conducted dental sealant programme as a public oral health program in elementary school children to prevent occlusal caries and to improve oral health. Subjected teeth were 337 pairs of sound first molars. We checked and discribed the pattern of outline change of sealants and caries incidence every 3-month for 30 months. The aim of this study was to evaluate the relation between outline change of sealant body and caries incidence. Obtained results were as follows ; 1. D-type loss of sealants was most frequent and highest caries incidence. 2. The rate of sealant loss including partial loss and caries incidence was rapidly increased between 9th and 12th month and between 24th and 17months. 3. In light-cured sealants, the rate of sealant loss was lower and caries preventive effectiveness was higher as compared with self-cured sealants. 4. The rate of sealants loss in warm drying method was slightly lower and caries preventive effectiveness was higher than cold drying method. From these results, we suggested that considering the type of sealant loss, periodic reapplication of sealants every 1-year was very important in order to maintain higher caries preventive effectiveness.
광중합형 글래스아이오노머 시멘트의 전단결합강도에 대한 연구
김현양,태기출,국윤아,김상철 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.5
법랑질의 표면처리에 따른 광중합형 글래스아이오노머 시멘트의 전단결합강도를 알아보고자 사람 소구치 80개를 선택하여 8개군으로 나누어 전단 결합 강도를 측정하고, 접착 파절의 양상을 평가하여 다음과 같은 결과를 얻었다. 1. 37% 인산용액으로 부식한 후 건조상태에서 글래스아이오노머 시멘트, 광중합형 레진, 화학중합형 레진으로 각각 부착한 실험군에서 글래스아이오노머 시멘트 실험군의 전단결합강도는 두 군과 유의한 차가 없었으나 화학중합형 레진군의 그것은 광중합형 레진군에 비해 유의성있게 낮았다 (P<0.05). 2. 37% 인산 실험군, 10% 폴리아크릴산 실험군, 1.23% APF 실험군, 산처리하지 않은 실험군의 습한 상태에서 부착한 글래스아이오노머 시멘트의 전단결합강도에서 산처리하지않은 실험군의 그것이 유의성 있게 낮았으며, 그 외 군간에는 유의성 있는 차이가 없었다 (P<0.05). 3. 글래스아이오노머 실험군에서 습기의 존재가 전단결합강도에 유의성 있는 영향을 미치지 않았다 (P<0.05). 4. 산부식처리를 하지않은 군의 접착제 잔류지수가 가장 낮았으며 37% 인산용액으로 처리한 군의 접착제 잔류지수가 가장 높았다. The purpose of this study was to evaluate the shear bond strength of light cured glass ionomer cement to enamel surface which treated with 37% phosphoric acid, 10% polyacrylic acid, 1.23% acidulated phosphate fluoride gel and no etching agent. To compare the shear bond strength of glass ionomer cement, light-cured composite resin and chemically-cured composite resin were empoloyed as controls. Eight experiments groups were composed. 10 specimens of each group were bonded by metal bracket by tested in universal testing machine for shear bond strength, in stereoscope for adhesive remnants index. The data were evaluated statistically by SPSS/PC+. The results were as follows. 1. Among the groups of 37% phosphoric acid treated and dry and bonded with light cured glass ionomer, light cured composite resin, and chemically cured composite resin, the shear bond strength of glass ionomer group showed no significant difference to the others, but the shear bond strength of chemically cured resin showed statistically lower than that of light cured resin (P<0.05). 2. The shear bond strengths of glass ionomer cement to enamel treated group with 1.23% acidulated phosphate fluoride gel and 10% polyacrylic acid and 37% phosphoric acid showed statistically higher than that of no etched enamel group(P<0.05). 3. In the glass ionomer cement, the presence of moisture was not significantly effect to the shear bond strength (P<0.05). 4. After debonding, no etched enamel group showed less residual materials on the enamel surface than the group of enamel etched with 37% phosphoric acid.