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윤달호 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.16 No.-
A (1-1) discrete solid-on-solid model of epitaxial growth is introduced which takes into account the effect of an Ehrlich-Schwoebel(ES) barrier at step edge. For the diffusion control constant, ??≤0, it gives rise to conventional kinetic roughning mophologies (EW (?? < 0) and MH( ?? : 0 ) universality class). However, for ?? > 0, it gives rise to mound structure and various growth exponent β according to characteristic diffusion length R_(0).
잔물결 빌리아드계의 양자역학적 고유에너지준위간의 통계적 거동
윤달호 청주대학교 2014 産業科學硏究 Vol.31 No.2
The quantum mechanical chaotic behavior of ripple billiard that has sinusoidal boundary wall is investigated. We find out that a remarkable correspondence between characteristic features of classical dynamics and. the statistics of level spacings appears with a amplitude parameter being vaired.
매개변수를 통해 변화하는 해석적 경계를 갖는 빌리아드 군의 고전적 혼돈 거동
윤달호 청주대학교 2013 産業科學硏究 Vol.30 No.2
The one parameter controlled billiard with analytic boundaries is investigated classically. By the correspondence between topological structure in the Poincare surface of section and the statistics of energy level spacing appears with a controlled parameter being varied, we find out the new points in such a way that classical dynamic changes.
플러렌분자에 충돌하는 수소분자 거동의 동역학 시뮬레이션
윤달호 청주대학교 2011 産業科學硏究 Vol.28 No.2
The hydrogen molecule behaviors colliding with fullerene molecule have been investigated by molecular dynamic simulation. We have calculated the dynamic properties of the adsorption and recoil of hydrogen molecule incident on a molecule over range . In 28 eV, one hydrogen atom captured by fullerene molecule while another molecule bounced off fulleren molecule.
윤달호 청주대학교 2012 産業科學硏究 Vol.29 No.2
We study the classical chaotic behaviors of a ripple billiard that has sinusoidal walls. The morphology of Poincare surface of cross section shows that the ripple billiard changes from an integrable system to a mixed and then to a fully chaotic system as the billiard amplitude a increase from zero. For and , the structure of island of section is big changed. At the system is in fully chaotic state.
임의 방향 자기장하에서 일축 이방성 나노스핀계의 탈출 비율
윤달호 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.17 No.2
We investigate the escape rate of the uniaxial nanospin particle with an arbitrarily directed magnetic field, described by Hamiltonian H^=-DS^(2)_(z)-H_(χ)S_(χ)-H_(z)S_(z), D 〉0. By reducing this hamiltonian to a particle one, and by applying the small oscillation pertubation theory, we obtained a phase boundary curves depending on the field parameters h_(z)(≡H_(z)/(2S+1)D) and h_(χ)
상호작용하는 단합체 - 이합체 분자 촉매 모형의 임계현상
윤달호 청주대학교 산업과학연구소 1993 産業科學硏究 Vol.11 No.-
같은 종류의 반응 물질 사이에 아주 강한 척력이 작용하는 단합체-이합체(monomer-dimer) 분자 촉매 모형의 임계현상을 연구 하였다. 이모형은 반응상에서 무한히 많은 흡수상태수를 가지는 정적인 상으로 연속적인 상전이를 보인다. 동력학적인 몬테칼로 전산 모의 실험을 통하여 이 상전이 현상이 일반적인 반향성 여과 현상(Diredted Pocolation : DP) 와 리지온-장론(Reggeon-Field-Theory : RFT) 보편성군 (Universality class)에 속하는 것을 확인 하였다. We study the critical behavior of two-dimensional interacting monomer-dimer catalysis model with infinitley strong repulsive interactions between the same species. This model exhibits a continuous transition from a reactive phase to an infinitely many absorbing states. Through dynamical Monte Carlo simulations we confirmed that this transition belongs to the directed percolation and Reggeon-Field-Theory universality class.
수소원자와 플러렌분자 충돌에 대한 분자동력학 시뮬레이션
윤달호 청주대학교 2009 産業科學硏究 Vol.26 No.2
The hydrogen atom behaviors colliding with molecule have been investigated by molecular dynamic simulation. We have calculated the probabilities of the adsorption of hydrogen atom incident on a molecule over range . The probabilities depend on the energy of incident hydrogen atom and greater than the case of CNT-hydrogen collision.
이축이방성을 갖는 나노 스핀계의 입자 본뜨기 방법을 이용한 터넬링 연구
윤달호 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.18 No.2
We derive the conventional Hamiltonian of biaxial spin Hamiltonian with the magnetic field along the hard anisotropy axis by particle mapping method In our procedure, the mapped potential has complex form whose real part is periodic with two ground states and the wave function is subjected to the boundary condition involving an phase shift. We guess the imagianry part of potnetial is reponsible to the topological phase shift in the wave function in the manner of Aharnov-Bohm effect.
Robnik 빌리아드계에 대한 고전 동력학과 에너지준위간격 분포의 관계
윤달호 청주대학교 산업과학연구소 2005 産業科學硏究 Vol.22 No.3
The Robnik billiard system is investigated both classically and quantum mechanically from integrable to almost chaotic system. There are remarkable correspondence between features of classical dynamics in topological structure of integrable regions, and the statics of energy level spacing appears with a system parameter λ being varied. It is shown that the variance of the level spacing changes its topological structure in the Poincare surface of section.