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원종진(Chongjin Won),이종선(Jongsun Lee),윤희중(Heejoung Youn) 한국자동차공학회 2004 한국자동차공학회 Symposium Vol.- No.-
In this study, using nonlinear deformation theories and by closed-form analysis and finite difference energy methods, respectively, various buckling load factors are obatined for stiffened laminated composite panels with rectangular type longitudinal stiffeners and various longitudinal length to radius ratios, which are made from Carbon/Epoxy USN125 prepreg and are simply-supported on four edges under uniaxial compression, and then for them, minimum weight design analyses are carried out by the nonlinear search optimizer, ADS.<br/>
박영걸(Young Gul Park),원종진(Chongjin Won),정재일(Jay I. Jeong) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this study, an elastic network model is established in order to find dominant factors which reflect thermostability of protein structures. The connections in the elastic network model are selected with respect to the free energy between alpha-carbons, which is representatives of residues in the elastic network model. We carried out normal mode analysis and compared eigenvalues of the stiffness matrix from the elastic network model. In most cases, thermophilic proteins are observed to have higher values of lowest natural frequency than mesophiles and psychrophiles have. As a result, the thermophiles are calculated to be stiffer than other proteins in view of dynamic vibration.
UV 나노임프린트리소그래피의 정렬 공정 중 몰드의 변형해석
박인수(Insoo Park),원종진(Chongjin Won),임홍재(Hongjae Yim),정재일(Jay I. Jeong) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Deformation of a mold is measured and analyzed in alignment and curing processes of UV-Imprint Lithography. We are focused on mold deformation caused by a UV resin, which is laminated between a mold and a target glass-panel. The UV resin is viscous in case of liquid state, and the resin will be solidified when being exposed by the ultra-violet light. The viscosity of the resin causes shear force on the mold during the alignment process. Moreover, the shrinkage during phase change from liquid to solid may cause residual stress on the mold. The experiments for measuring temperature and strain are made during alignment and curing process. Strain-gages and thermocouples are used for measuring the strain and variation of temperature on several points of the mold, respectively. The deformation of mold is also simulated and analyzed. The simulation results are compared with the experiments. Finally, sources of alignment errors in large area UVnanoimprint lithography are discussed.
SimMechanics를 이용한 4축 과구동 스테이지의 모델링
이진영(Jinyoung Lee),박원준(Wonjun Park),원종진(Chongjin Won),정재일(Jay I. Jeong) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this paper, kinematic analysis for a planar 3-DOF redundant stage which has four actuators is presented by using SimMechanics software package. SimMechanics is a block sets of the Matlab/Simulink package. The SimMechanics enables a simplified model for a complex kinematic mechanism, since kinematic relationship between joints and linkages for the kinematic chains are expressed as line vectors and block diagrams. Here, positional error and limit values of movement ranges of the stage are evaluated by using the SimMechanics. The validity of the kinematic characteristics model was compared with theoretical kinematic analyses for the 3-DOF stage.
최용석(Yongsuk Choi),노기훈(Kihoon Noh),원종진(Chongjin Won),정재일(Jay I. Jeong) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, the calibration process is executed for an over-actuated precision stage, which is designed for alignment process in nano-imprint fabrication process. We measured the positional accuracy of the stage for the X-Y axis to identify position errors and performed the calibration procedure by using a lookup table and interpolation. As a result, the precision stage is calibrated to have position errors of less than 1 micrometer in X and Y axis.
4축 스테이지 속도와 가속도 변화에 따른 입출력 오차 분석
최용석(Yongsuk Choi),노기훈(Kihoon Noh),원종진(Chongjin Won),정재일(Jay I. Jeong) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Precision of stage which is used in nano imprint fabrication process is one of the element to influence in alignment process. The 4 axis stage either which is positioned continuously actuator to operator precise motion as a nano level or which is positioned and made with two actuator in each axises is possible motion of 3 degrees of freedom(X, Y, θ). but 4axis stage can be happened to mechanical error, because there are many actuator than number of degree worked by constructor, when stage is worked. so, if this reason of error is revised after understanding, 4 axis stage is more precise in the nano imprint fabrication process then there can be made more exact LCD panel. This study has a purpose to search that value was revised so that e after when working 4axis This purpose of study is calculating profile of velocity and profile of position about 4axis stage velocity difference and is search reviced value to compare result value and input-output value.