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분자동역학을 이용한 SPC/E 모델의 Water 액적 시뮬레이션
최동명(Dong Myeong Choi),최호진(Ho Jin Choi),홍승도(Seung Do Hong),하만영(Man Yeong Ha),채동진(Dong Jin Chae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This paper presents a molecular dynamics simulation of the water at the liquid vapor equilibrium state. The extended simple point charge(SPC/E) interaction potential for water molecules is used with full Eward summation. The system was equilibrated at a desired temperature for reasonable time steps by velocity rescaling and another time steps of non-thermostat equilibration. During the time calculation, statistical properties are sampled and calculated to compare experimental data. Result show that the calculated density and radial distribution function of water fit well with experiment data. This simulation technique can be used to investigate many nano scale phenomenon.
최동명(Dong-Myung Choi),신영길(Young-Kil Shin),권영호(Young-Ho Kweon) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
복합층에서 나타나는 투과형 펄스와전류(Pulsed Eddy Current; PEC) 탐상신호를 수치해석 방법을 사용하여 예측하고 분석하였다. 공기층이 없는 복합층에서 Ti-6Al-4V의 두께가 변하는 경우에는 Life-off를 변화시켰을 때 나타나는 펄스와전류 신호특성과 LOI(Lift-off Intersection)가 형성되는 것을 관찰할 수 있었고, Aluminum의 두께가 변하는 경우에는 Aluminum만의 두께변화 시 발생하던 신호특성이 났다. 공기층이 있는 복합층에서는 Lift-off를 변화시켰을 때 나타나는 신호특성과 LOI가 형성되었고, 공기층이 증가하면 피크 값이 감소하는 것을 볼 수 있었다.
Comparison of Simulated PEC Probe Performance for Detecting Wall Thickness Reduction
신영길,최동명,정희성 한국비파괴검사학회 2009 한국비파괴검사학회지 Vol.29 No.6
In this paper, four different types of pulsed eddy current(PEC) probe are designed and their performance of detecting wall thickness reduction is compared. By using the backward difference method in time and the finite element method in space, PEC signals from various thickness and materials are numerically calculated and three features of the signal are selected. Since PEC signals and features are obtained by various types and sizes of probe, the comparison is made through the normalized features which reflect the sensitivity of the feature to thickness reduction. The normalized features indicate that the shielded reflection probe provides the best sensitivity to wall thickness reduction for all three signal features. Results show that the best sensitivity to thickness reduction can be achieved by the peak value, but also suggest that the time to peak can be a good candidate because of its linear relationship with the thickness variation.