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Seoung Hwan Lee
Hanyang University
35Publications
12H-index
396Citations
Publications 35
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#1Seoung Hwan Lee (Hanyang University)H-Index: 12
#2Yoomin Ahn (Hanyang University)H-Index: 17
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#1Yoomin Ahn (Hanyang University)H-Index: 17
#2Seoung Hwan Lee (Hanyang University)H-Index: 12
Source
#1Jung-Sun Kim (Hanyang University)
#2Hyojeong Kim (Hanyang University)
Last.Seoung Hwan Lee (Hanyang University)H-Index: 12
view all 3 authors...
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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#1Hee Hwan Lee (Hanyang University)
#2Seoung Hwan Lee (Hanyang University)H-Index: 12
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: 17
#2Seoung Hwan Lee (Hanyang University)H-Index: 12
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: 12
#2Yoomin Ahn (Hanyang University)H-Index: 17
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...
9 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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#1Seoung Hwan Lee (Hanyang University)H-Index: 12
#2Suneung Ahn (Hanyang University)H-Index: 5
Last.Changsoon Park (Hanyang University)H-Index: 3
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In this article, an in-process monitoring scheme for a pulsed Nd:YAG laser spot welding (LSW) is presented. Acoustic emission (AE) was selected for the feedback signal, and the AE data during LSW were sampled and analyzed for varying process conditions such as laser power and pulse duration. In the analysis, possible AE generation sources such as melting and solidification mechanism during welding were investigated using both the time- and frequency-domain signal processings. The results, which ...
5 CitationsSource
#1Nahm Gyoo Cho (Hanyang University)H-Index: 2
#2Seoung Hwan Lee (Hanyang University)H-Index: 12
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
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