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Seoung Hwan Lee
Hanyang University
PolishingComposite materialAcoustic emissionMaterials scienceMachining
22Publications
6H-index
169Citations
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Publications 30
Newest
#1Jung-Sun Kim (Hanyang University)
#2Hyojeong Kim (Hanyang University)
Last. Seoung Hwan Lee (Hanyang University)H-Index: 6
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In this study, a novel setup for a nanoscale finishing process - magnetic abrasive finishing (MAF) - was investigated together with in-process monitoring using acoustic emissions (AE). A specially fabricated direction control piece with a neodymium magnet was attached to an MAF setup to perform surface finishing of thin-film (IZO) coated Pyrex glass workpieces within a selective area. For the selective finishing experiments, design of experiment (DOE) was applied to optimize the surface roughnes...
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#1Seoung Hwan Lee (Hanyang University)H-Index: 6
#2Yoomin Ahn (Hanyang University)H-Index: 18
1 CitationsSource
#1Yoomin Ahn (Hanyang University)H-Index: 18
#2Seoung Hwan Lee (Hanyang University)H-Index: 6
The goal of this research is to investigate and monitor machining mode transitions during nanoscale scratching of IZO-coated Pyrex glasses using atomic force microscope (AFM). Among the AFM...
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#1Hee Hwan Lee (Hanyang University)
#2Seoung Hwan Lee (Hanyang University)H-Index: 6
The material removal rate (MRR) during precision finishing/polishing is a key factor, which dictates the process performance. Moreover, the MRR or wear rate is closely related to the material/part reliability. For nanoscale patterning and/or planarization on nano-order thickness coatings, the prediction and in-process monitoring of the MRR is necessary, because the process is not characterizable due to size effects and material property/process condition variations as a result of the coating/sub...
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#1Yoomin Ahn (Hanyang University)H-Index: 18
#2Seoung Hwan Lee (Hanyang University)H-Index: 6
In the micro drilling of precision miniature holes, the formation of exit burrs is a topic of interest, especially for ductile materials. Because such burrs are difficult to remove, it is important to be able to predict various burr types and to employ burr minimisation schemes that consider burrs’ micro-scale characteristics. In the present work, an artificial neural network (ANN) was used to predict the formation of burrs in the micro drilling of copper and brass, along with burr formation/opt...
3 CitationsSource
We investigate a surface finishing scheme fitted for AFM scratched nanopatterns on a coated surface using magnetic abrasive finishing (MAF). First, nanoscale patterning was carried out on IZO-coated Pyrex glass, with a specially-designed AFM machining setup. After AFM machining, nonuniform surface features such as pile-ups are generated, and the final shapes are often more complicated for coated materials. For this reason, MAF was implemented for the nanoscale removal of pile-up/debris of coated...
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#1Seoung Hwan Lee (Hanyang University)H-Index: 6
#2Yoomin Ahn (Hanyang University)H-Index: 18
Abstract Power densities of microfluidic fuel cells are still not high enough for power source applications. In this study, we propose a novel planar stack to increase the total power of a microfluidic fuel cell. Electrical connections in serial or parallel are made within one channel by using multiple laminar flow. A planar structure with flow-over electrodes of platinum are adopted for easy integration with other planar micro devices. These structures are made by micromachining with a thin fil...
12 CitationsSource
#1Dong-Hyeok Lee (Hanyang University)H-Index: 3
#2Min-Gyu Kim (Hanyang University)H-Index: 2
Last. Nahm Gyoo Cho (Hanyang University)H-Index: 2
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In this research, a five-degree of freedom (5-d.o.f.) stitching method is proposed which is implemented by calculating the 5-d.o.f. relative position and orientation between small areas of 3D profile data acquired with high resolution. The relative position and orientation is calculated from the data of the overlap area for adjacent measured areas by using the least squares method and the cross correlation function. Furthermore, a data synchronizing algorithm is also proposed for the case in whi...
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#1Nahm Gyoo Cho (Hanyang University)H-Index: 2
#2Seoung Hwan Lee (Hanyang University)H-Index: 6
Atomic force microscopy is often used not only to acquire the sample surface topography at the subnanometer scale but also to measure forces on the surface during imaging. This study aims to develop a practical measurement scheme of the actual scratching forces exerted during atomic force microscopy nanoscratching using a simple optical microscope setup. The measurement results are utilized to analyze the mode characteristics of atomic force microscopy nanomachining. Unlike typical atomic force ...
2 CitationsSource
#1Seoung Hwan Lee (Hanyang University)H-Index: 6
#2Young Heon Kim (Hanyang University)H-Index: 5
Last. Je Hoon Oh (Hanyang University)H-Index: 1
view all 5 authors...
The structural behaviour of a windshield wiper system and the dynamic behaviour of the wiper rubber blade are investigated using finite element analysis. Non-linear contact analysis was performed to examine the influences of the structural design variables such as the curvature of the primary beam, the thickness of the yoke, the rotational angle of the yoke and the thickness of the steel beam on the distribution of the contact force along the blade length, and the effects of the vertical load an...
1 CitationsSource
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