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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Visualization
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Journal DOI :
The Korean Society of Visualization
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Volume & Issues
Volume 5, Issue 2 - Dec 2007
Volume 5, Issue 1 - Jun 2007
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Capillary-driven Rigiflex Lithography for Fabricating High Aspect-Ratio Polymer Nanostructures
Jeong, Hoon-Eui ; Lee, Sung-Hoon ; Kim, Pil-Nam ; Suh, Kahp-Y. ;
Journal of the Korean Society of Visualization, volume 5, issue 1, 2007, Pages 3~8
DOI : 10.5407/JKSV.2007.5.1.003
We present simple methods for fabricating high aspect-ratio polymer nanostructures on a solid substrate by rigiflex lithography with tailored capillarity and adhesive force. In the first method, a thin, thermoplastic polymer film was prepared by spin coating on a substrate and the temperature was raised above the polymer`s glass transition temperature (
) while in conformal contact with a poly(urethane acrylate) (PUA) mold having nano-cavities. Consequently, capillarity forces the polymer film to rise into the void space of the mold, resulting in nanostructures with an aspect ratio of
. In the second method, very high aspect-ratio (>20) nanohairs were fabricated by elongating the pre-formed nanostructures upon removal of the mold with the aid of tailored capillarity and adhesive force at the mold/polymer interface. Finally, these two methods were further used to fabricate micro/nano hierarchical structures by sequential application of the molding process for mimicking nature`s functional surfaces such as a lotus leaf and gecko foot hairs.
In vivo Imaging Flow Cytometer
Lee, Ho ;
Journal of the Korean Society of Visualization, volume 5, issue 1, 2007, Pages 9~11
DOI : 10.5407/JKSV.2007.5.1.009
We introduce an in vivo imaging flow cytometer, which provides fluorescence images simultaneously with quantitative information on the cell population of interest in a live animal. As fluorescent cells pass through the slit of light focused across a blood vessel, the excited fluorescence is confocally detected. This cell signal triggers a strobe beam and a high sensitivity CCD camera that captures a snap-shot image of the cell as it moves down-stream from the slit. We demonstrate that the majority of signal peaks detected in the in vivo flow cytometer arise from individual cells. The instrument`s capability to image circulating T cells and measure their speed in the blood vessel in real time in vivo is demonstrated. The cell signal irradiance variation, clustering percentage, and potential applications in biology and medicine are discussed.
Understanding Diffusion in Cells and Living Tissues
Kim, Jung-Kyung ;
Journal of the Korean Society of Visualization, volume 5, issue 1, 2007, Pages 12~15
DOI : 10.5407/JKSV.2007.5.1.012
Macromolecule diffusion in cells and tissues is important for cell signaling, metabolism and locomotion. Biophysical methods, including non-invasive or minimally invasive in-vivo photobleaching techniques and single quantum-dot tracking, have been used to measure the rates of macromolecule diffusion in living cells and tissues, including central nervous system and tumors. Mathematical modeling and statistical analysis of experimental data revealed various modes of diffusion, which are strongly coupled with spatiotemporal changes in nanoscale structures and material properties.
Study on Quantitative Visualization Using Bubble Tracer in a Cavitation Tunnel
Paik, Bu-Geun ; Kim, Kyung-Youl ; Cho, Seong-Rak ; Ahn, Jong-Woo ;
Journal of the Korean Society of Visualization, volume 5, issue 1, 2007, Pages 22~29
DOI : 10.5407/JKSV.2007.5.1.022
In the present study, naturally generated bubbles were investigated to be sure if they could be adopted as the tracer for PIV techniques. The bubble can be grown from the nuclei melted in the water of tunnel and the size of bubbles is changed through the variation of tunnel pressure. Since the trace ability and appropriate size of tracer are so important for PIV techniques, the characteristics of bubbles as tracer are revealed in terms of trace ability and bubble size with the variation of flow speed and tunnel pressure in this study. In addition, PIV measurements of (low behind a rotating propeller are conducted to confirm the trace ability of bubbles even in a highly vortical flow.
X-ray Micro-imaging of Arsenic Absorption of Sap Flow in Xylem Vessels of Pteris
Lee, Jin-Pyoung ; Lee, Sang-Joon ;
Journal of the Korean Society of Visualization, volume 5, issue 1, 2007, Pages 30~36
DOI : 10.5407/JKSV.2007.5.1.030
The global environment is deteriorating at an alarming rate, despite of enhanced international environmental regulation. Many studies have been performed to reduce toxic pollutants. Recently, plant-based phytoremediation technology for moving toxic contaminants from soil and water has been receiving large attention. Arsenic-contaminated soil is one of the major pollutant sources for drinking water. Pteris erotica has been known as a hyper-accumulator of arsenic from soils. In this study, we investigated the effect of arsenic absorption on sap flow inside xylem vessels of Pteris. The synchrotron X-ray micro-imaging technique was employed to monitor the refilling process of water containing arsenic inside the xylem vessels of Pteris`s leaves and stems non-invasively. The captured phase-contrast X-ray images show both anatomy of internal structure and transport of water inside Pteris. The exposure of Pteris to arsenic solution was found to increase largely the water raise speed in xylem vessels. The present results would provide important information needed for understanding the mechanisms of accumulation and transportation of toxic materials in plants.
Flow Analysis of Reverse Flow in a Channel with High Angle of Attack
Choi, Seung ; Sohn, Chang-Hyun ;
Journal of the Korean Society of Visualization, volume 5, issue 1, 2007, Pages 37~42
DOI : 10.5407/JKSV.2007.5.1.037
Reverse flow occurs in a channel when there is an obstruction at the entry. However it has been shown recently that reverse flow can be realized without an obstruction, by staggering the sides of the channel and placing it at an angle of attack to the oncoming flow. In this study the latter flow is computationally investigated. Studies have been carried out for different widths (gap between the two walls forming the channel), and at an angle of attack of 30. The results have captured all the essential features of this complex phenomenon and show the time dependent pumping mechanism which leads to the occurrence of reverse flow.
Stereoscopic micro-PIV measurements of jet flow
Yu, Cheong-Hwan ; Kim, Hyoung-Bum ;
Journal of the Korean Society of Visualization, volume 5, issue 1, 2007, Pages 43~48
DOI : 10.5407/JKSV.2007.5.1.043
Micro-PIV(particle image velocimetry) has been widely used to measure the velocity of micro flow. Although this micro-PIV method can give accurate 2D instantaneous velocity information of mea-surement plane, it cannot resolve the out of plane component of velocity vectors. Lots of the micro fluidic devices generate three-dimensional flow and 3D measurement of velocity is useful to understand the physics of micro flow phenomena. In this study, we constructed stereoscopic micro-PIV(SMPIV) system and applied this method to the impinging micro jet flow. The results show that this method can produce accu-rate 3D reconstruction of micro jet flow.