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적합직교분해법을 이용한 AFM 마이크로캔틸레버의 진동해석
홍상혁(Sang Hyuk Hong),이수일(Soo Il Lee) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.4
The proper orthogonal decomposition(POD) is used to the vibration analysis of microcantilever in tapping mode atomic force microscopy(AFM). The proper orthogonal modes (POM) are extracted from vibrating signals of microcantilever when it resonates and taps the sample. We present recent ideas based on POD and detailed experiments that yield new perspectives into the microscale structures such as the tapping cantilever. The linearized modeling technique based on POD is very useful to show the principal characteristics of the complex dynamic responses of the AFM microcantilever.
적합직교분해법을 이용한 AFM 마이크로캔틸레버의 모드해석
홍상혁(Sang Hyuk Hong),조홍모(Hong Mo Cho),이수일(Soo Il Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The proper orthogonal decomposition(POD) is used to the modal analysis of microcantilever of dynamic mode atomic force microscopy(AFM). The proper orthogonal modes(POM) are extracted from vibrating signals of microcantilever when it resonates and taps the sample. We present recent ideas based on POD and detailed experiments that yield new perspectives into the microscale structures. The linearized modeling technique based on POD is very useful to show the principal characteristics of the complex dynamic responses.
홍상혁(Sang Hyuk Hong),이수일(Soo Il Lee),이장무(Jang Moo Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In tapping mode atomic force microscopy (TM-AFM), the vibro-contact response of a resonating tip is used to measure the nanoscale topology and other properties of a sample surface. However, the nonlinear tipsurface interactions can affect the tip response and destabilize the tapping mode control. Especially it is difficult to obtain a good scanned image of high adhesion surfaces such as polymers and biomolecules using conventional tapping mode control. In this study, theoretical and experimental investigations are made on the nonlinear dynamics and control of TM-AFM. Also we report the surface adhesion is an additional important parameter to determine the control stability of TM-AFM. In addition, we proved that it was adequate to use Johnson-Kendall-Roberts (JKR) contact model to obtain a reasonable tapping response in AFM for the soft and high adhesion samples.
홍상혁(Hong, Sang-Hyuk),이수일(Lee, Soo-Il) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
In tapping mode atomic force microscopy(TM-AFM). the vibro-contact response of a resonating tip is used to measure the nanoscale topology and other properties of a sample surface. However, the nonlinear tip-surface interact ions can affect the tip response and destabilize the tapping mode control. Especially it is difficult to obtain a good scanned image of high adhesion surfaces such as polymers and biomoleculars using conventional tapping mode control. In this study, theoretical and experimental investigations are made on the nonlinear dynamics and control of TM-AFM. To analyze the complex dynamics and control of the tapping tip, the classical contact models are adopted due to the surface adhesion. Also we report the surface adhesion is an additional important parameter to determine the control stability of TM-AFM. In addition, we prove that it is more adequate to use Johnson-Kendall-Roberts (JKR) contact model to obtain a reasonable tapping response in AFM for the soft and high adhesion samples.
이수일(Soo Il Lee),홍상혁(Sang Hyuk Hong) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
A simple model has been developed and analyzed capturing the main dynamic features in longitudinal flip-chip bonding. The ultrasonic horn is modeled as a longitudinal rod with the contact conditions after verifying the modal characteristics by using finite element analysis. The MATLAB simulation is performed for the simplified equation of motion of the horn model and the results show the nonlinear vibration effects in the flip-chip bonding process.