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철을 오염시킨 n-GaAs의Photoreflectance에 관한 연구
유재인,문영희,이동울,이정열,배인호,장광수 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-
We investigated the variation of PR signals for n-GaAs surface treated with Fe as annealing method. The samples were annealed by isochronal(200∼600 ℃, 10 min) and isothermal(300 ℃, 10 ∼60 min) method. In PR signals measured from isochronal annealed samples, the rate of intensity decreasing for n-GaAs was 49%, and that for n-GaAs surface treated with Fe was 66%. We assumed that the large amount of decreasing intensity for Fe contaminated sample caused by decreasing carrier density due to increasing of ?? neutral acceptor at higher annealing temperature. In PR signals measured from isothermal annealed samples, the signals for annealed n-GaAs decreased with increasing annealing time, and the signals for n-GaAs surface treated with Fe continuously increased with increasing annealing time. It can be assumed that the increasing of PR intensity for Fe contaminated samples as annealing time caused by the diffusion of Fe atoms from the surface.
장광수 嶺南大學校附設 基礎科學硏究所 1984 基礎科學硏究 Vol.4 No.-
As starting point we shall take the hamiltonian operator which describes the interaction between electrons and lattice vibrations. With the transformation of creation and annihilation operators for phonons and electrons by exponential function, equations of motion in Heisenberg picture shows us that phonon-electron interaction is transformed into effective electron-electron interaction. By the linearized equation of motion in reduced hamiltonian, We have the quasiparticle operator, normalized ground state in the quasiparticle approximation and real excited state in superconductivity. We may evaluate the energy gap parameter ?? by performing the appropriate integration.
반복제어 알고리즘을 이용한 2축 시스템의 고속 경로 제어 설계
張光洙 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-
본 연구는 반복제어기법을 사용하여 토크제한이 있는 다축 고속 시스템에서 최적의 경로를 설계하는 방법을 소개 하였다. 이 방법은 기존의 시변 경로 설계법이 실시간 구축에는 부적합하고 모델 파라미터가 정확해야 한다는 단점을 보완하여 반복제어기법을 사용함으로써 실시간 경로설계에 매우 적합하다는 장점을 보여 주고있다. 이는 많은 공정 가공시스템이 작업자가 현장에서 실시간으로 공구를 교환하며 수행하고 있음을 염두에 둘때 매우 유용한 방법으로 사료된다.