Papers by Author: Hyun Kyu Kweon

Abstract: This study is about the underlying conjugation mechanism between carbon nanotube and biomolecule by molecular dynamics. In order to know about the conjugation mechanism between carbon nanotube and biomolecule, molecular dynamics simulation between carbon nanotube and water molecules was taken first and then molecular dynamics simulation between biomolecules and water molecules was taken. At simulation between carbon nanotube and water molecules, kinetic energy and potential energy became decreased with time and it means that the distance between carbon nanotube and water molecules becomes distant with time by van der Waals force and hydrophobic force. Simulation results between biomolecules and water molecules are also same as the results of carbon nanotube and water molecules simulation. From these two simulations, the conjugation mechanism between carbon nanotube and biomolecules can be predicted. Also, from simulation results between carbon nanotube and biomolecules, the distance between carbon nanotube and biomolecules becames close and it supports previous two simulation results. From these results, we can know that biomolecules enter into the carbon nanotube's cavity because of van der Waals force and hydrophobic force.

Abstract: Most of the nano-positioning systems(stage) are accomplished by a flexure hinge mechanism, which is two or three multilayer PZT actuators to realize the high accuracy and long range[1]. In this paper, it can be made by a new nano stage with the bending characteristics of the mechanical cantilever that is composed of the step motor, one multilayer PZT actuator and the displacement sensor unit. The sensor unit consists of semiconductor LD, PD and sensor holder. The displacement of stage is acquired by the bending control of the cantilever between the step motor and the PZT actuator. The basic properties of the positioning stage are presented. From these results, we can know that the new nano stage can be made by only one multilayer PZT actuator .