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전석기(Sukky Jun),조영삼(Young-Sam Cho),임세영(Seyoung Im) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The moving least square (MLS) basis is implemented for the real-space band-structure calculation of 2D<br/> photonic crystals. The value-periodic MLS shape function is thus used in order to represent the periodicity of<br/> crystal lattice. Any periodic function can properly be reproduced using this shape function. Matrix eigenequations,<br/> derived from the macroscopic Maxwell equations, are then solved to obtain photonic band<br/> structures. Through numerical examples of several lattice structures, the MLS-based method is proved to be a<br/> promising scheme for predicting band gaps of photonic crystals.
조영삼(Young-Sam Cho),전석기(Sukky Jun),김성엽(Sung Youb Kim),임세영(Seyoung Im) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Strain-induced bandgap tuning of 2D silicon-based photonic crystals is performed using a real-space computation of band structures. We have proved that the uniaxial tension mode is more effective for bandgap tuning than both pure and simple shear deformations. We further verify that these bandgap modifications rely on the deformation-induced distortion of interfaces between inclusions and matrix. Our numerical results strongly imply that the real-space technique is indispensable for the accurate calculation of strained photonic bandgap materials.
조영삼(Young-Sam Cho),전석기(Sukky Jun),임세영(Seyoung Im) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
We propose a 2D 'crack' element for the simulation of propagating crack with minimal remeshing. A regular finite element containing the crack tip is replaced with this novel crack element, while the elements which the crack has passed are split into two transition elements. Singular elements can easily be implemented into this crack element to represent the crack-tip singularity without enrichment. Both crack element and transition element proposed in our formulation are mapped from corresponding master elements which are commonly built using the moving least-square (MLS) approximation only in the natural coordinate. In numerical examples, the accuracy of stress intensity factor K<SUB>I</SUB> is demonstrated and the crack propagation in a plate is simulated.
이영민(Youngmin Lee),김성엽(Sung Youb Kim),전석기(Sukky Jun),임세영(Seyoung Im),이인호(In-Ho Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, we present our recent simulations using the action-derived molecular dynamics (ADMD) that has recently been developed for the atomistic simulation of multiple time-scale simulations. The method is specifically designed to find a dynamical trajectory when the final atomic configuration is given as a priori. According to the formulation, the most probable dynamical trajectory connecting the initial and final atomic configurations, is determined through minimizing an appropriate object function that is derived from the classical action by imposing dynamical conditions as required as the conservations of total energy. Through several numerical examples, we demonstrate its robustness for the simulation ofrare-event systems.
이영민(Youngmin Lee),김성엽(Sung Youb Kim),전석기(Sukky Jun),임세영(Seyoung Im) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Molecular dynamics simulation of nanolithography by AFM is conducted to study nucleation of various defects, and their subsequent development and interactions as well. During nanolithography via AFM, dislocation loops are emitted along the top surface, and resourceful defect interactions such as, formation of voids chain via the motion of a jog, and creations of extended nodes and Lomer-Cottrell Lock are observed.
박종연(Jong Youn Park),이영민(Youngmin Lee),전석기(Sukky Jun),김성엽(Sung Youb Kim),임세영(Seyoung Im) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Molecular dynamics simulations on the deformation behavior of single-walled carbon nanotube are<br/> performed. Formation energies of CNT’s by interatomic potentials are computed and compared with ab initio<br/> results. Bending and axial compression are applied under lattice statics and NVT ensemble conditions.<br/> Specifically, we focus on the mechanism of kink formation in bending. The simulation results are<br/> comprehensively explained in the framework of atomistic energetics. The effects of temperature and chirality<br/> on the deformation of carbon nanotube are also studied.
Quantum Corral과 Dip-Pen Nanolithography의 전산모사
김성엽(Sung Youb Kim),이영민(Youngmin Lee),전석기(Sukky Jun),임세영(Seyoung Im) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Two nanoscale fabrications on the surface using a scanning probe microscopy (SPM) are numerically simulated. One is the quantum corral which reveals standing-wave patterns of electrons due to adatoms on the metallic surface. Quantum multiple scattering theory via Green function approach is imposed for the simulations. The other example is the process of dip-pen lithography. Random walk algorithm is applied for describing the diffusion patterns of deposited molecules.