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Field Ion Microscopy를 이용한 Tungsten Silicide의 연구
박동수,정찬익,정승민 慶北大學校 自然科學大學 1985 自然科學論文集 Vol.3 No.-
The atomic structure of silicide layers grown on tungsten surface has been studied by a Field Ion Microscopy. Silicide atoms were vapor deposited on the tungsten tip by resistive heating. Tungsten tips were atomically cleaned by means of pulsed field evaporation. The silicide formation has been achieved by electrical resistive heating in the ultra high vacuum chamber. The optium temperature for tungsten silicide formation was found to be around 700 to 750℃ and its composition was WSi_2. The observed FIM images were composed of tetragonal cllb structure. The silicide grew independently on each W{001} plate, which was considered due to the W lattice constant of these planes matches well with that of the basal of the silicide.
RHEED에 依한 Si(111) 表面 및 Au, Ag, Ge 蒸着量에 따른 表面構造의 調査
朴東秀,鄭燦翊,鄭烝敏,崔鐘武 慶北大學校 自然科學大學 1987 自然科學論文集 Vol.5 No.-
The clean Si(111) and Si(111) surface structures induced by Au, Ag, Ge deposition were investigated by RHEED. cleaning of the sample was done by passing the dc current directly through the sample and the temperatures of the sample were measured by reading the currents. The background vacuum pressure of the RHEED chamber was about 2∼5×10^-10 torr during the experiments. The clean Si(111) 7×7 superlattice surface structure was obtained by heating the sample up to 1,250℃ repeatedly. The Si(111) 7×7 structure was remained from room temperature to 830℃. Above 830℃ the 7×7 structure turned to 1×1 structure. This structure transition was reversible. The 7×7 structure is energetically most stable in spite of its formation at rather high temperture. When Au, Ag and Ge atoms were deposited on the Si(111) 7×7 surface, the dependence of structures and phases on substrate temperatures and deposited coverages was drasical. Au/Si(111) surface has 7×7, 7×7+5×1, α-√3×√3, β-√3×√3 and 6×6 superstructures for the various thickness of Au film and substrate temperatures. Ag/Si(111) surface has √3×√3, √3×√3+3×1, √3×√3+3×1+6×1, 7×7+6×1+3×1 and 7×7+√3×√3 superstructures for the variot thickness of Ag film and substrate temperatures. When Ag was deposited on substrate at temperature ranged between 290℃ and 550℃, Ag rod patterns appeared on the √3×√3 structure induced by Ag deposition. It was considered due to the Stranski-Krastanov growth of Ag. Ge/Si(111) surface has 7×7, 7×7+5×5, 5×5 and 7×7(G3) superstructures for the various thickness of Ge film and substrate temperatures. It was found that the difference of the lattice constant for Si(111) 7×7 and Ge/Si(111) 7×7 and Ge/Si(111) 7×7 is about 3%.
류은태(Chanik Jung),정찬익(Zonghua Jin),이원창(Wonchang Lee),강근택(Geuntaek Kang) 한국지능시스템학회 2004 한국지능시스템학회 학술발표 논문집 Vol.14 No.1
본 논문에서는 변조 함수법을 이용하여 비선형 연속시스템의 퍼지모델 파라미터 인식을 위한 새로운 알고리즘을 제시하였다. 동력학 미분방정식은 미분항을 가지고 있기 때문에 입출력 데이터를 이용하여 퍼지모델 파라미터를 인식하는 경우 외란의 영향을 무시할 수 없으므로 퍼지모델 파라미터 인식이 어렵다. 그러나 변조 함수법을 이용하면 미분항을 소거할 수 있어 미분항이 없는 연립방정식으로부터 쉽게 퍼지모델 파라미터 인식이 가능하다. 몇 개의 시뮬레이션을 통해 제안한 변조 함수법을 이용한 퍼지모델 파라미터 인식의 정확성과 유효성을 확인할 수 있었다.