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Jang, Hyung-Suk,Nam, Hye Yeong,Kim, Jeong-Min,Hahm, Dong-Hoon,Nam, So Hee,Kim, Koung Li,Joo, Jae-Ryang,Suh, Wonhee,Park, Jong-Sang,Kim, Duk Kyung,Gwon, Hyeon-Cheol Wiley Subscription Services, Inc., A Wiley Company 2009 CATHETERIZATION AND CARDIOVASCULAR INTERVENTIONS Vol.74 No.6
<B>Objective:</B><P>To evaluate the efficacy of the curcumin-coating stent (CCS) on the inhibition of restenosis in a rabbit iliac artery stent model.</P><B>Results:</B><P>Curcumin, pigment naturally acquired from the rhizome of the plant curcuma longa, is known to have antiproliferative, antimigratory, and anti-inflammatory effects. However, it is still unclear that curcumin can inhibit neointimal proliferation of the injured vessel.</P><B>Methods:</B><P>Dose-dependent inhibition of cell growth was observed over a dose range from 10 nM to 10 μM. CCS was prepared by a dip-coating method (high-dose: HD, low-dose: LD). The release profile of the HD CCS showed that drug release persisted until day 21. Scanning electron microscopy of the CCS showed an intact surface of the stent even after expansion. To test the efficacy of CCS in vivo, LD CCS, HD CCS, and bare metal stents (BMS) were implanted in random order in one iliac artery (N = 30 arteries) of male New Zealand White rabbits (N = 15).</P><B>Results:</B><P>After 28 days, the LD and HD CCS groups had a 43% and 55% reduction in the neointimal area, compared with the BMS group (BMS 3.3 ± 1.0 mm<SUP>2</SUP>, LD 1.9 ± 0.8 mm<SUP>2</SUP>, and HD 0.9 ± 0.5 mm<SUP>2</SUP>, P < 0.05). There appeared to be no cytotoxicity related to curcumin at the indicated doses.</P><B>Conclusions:</B><P>Curcumin, a natural compound in the human diet, seems to be a safe and effective candidate drug for use in a drug-eluting stent for the prevention of stent restenosis following angioplasty. © 2009 Wiley-Liss, Inc.</P>
Jang, Heejun,Kang, Il-Suk,Lee, Youngbok,Cha, Yun Jeong,Yoon, Dong Ki,Ahn, Chi Won,Lee, Wonhee IOP 2016 Nanotechnology Vol.27 No.36
<P>The direct transfer of graphene using polydimethylsiloxane (PDMS) stamping has advantages such as a ‘pick-and-place’ capability and no chemical residue problems. However, it is not easy to apply direct PDMS stamping to graphene grown via chemical vapor deposition on rough, grainy metal surfaces due to poor contact between the PDMS and graphene. In this study, graphene consisting of a mixture of monolayers and multiple layers grown on a rough Ni surface was directly transferred without the use of an adhesive layer. Liquid PDMS was cured on graphene to effect a conformal contact with the graphene. A fast release of graphene from substrate was achieved by carrying out wet-etching-assisted mechanical peeling. We also carried out a thermal post-curing of PDMS to control the level of adhesion between PDMS and graphene and hence facilitate a damage-free release of the graphene. Characterization of the transferred graphene by micro-Raman spectroscopy, SEM/EDS and optical microscopy showed neither cracks nor contamination from the transfer. This technique allows a fast and simple transfer of graphene, even for multilayer graphene grown on a rough surface.</P>
Nanofluidic chip for liquid TEM cell fabricated by parylene and silicon nitride direct bonding
Jang, Heejun,Kang, Il-Suk,Kim, Jihye,Kim, Jonghyun,Cha, Yun Jeong,Yoon, Dong Ki,Lee, Wonhee IOP 2017 Nanotechnology Vol.28 No.37
<P>Despite the importance of nanofluidic transmission electron microscope (TEM) chips, a simple fabrication method has yet to be developed due to the difficulty of wafer bonding techniques using a nanoscale thick bonding layer. We present a simple and robust wafer scale bonding technique using parylene as a bonding layer. A nanoscale thick parylene layer was deposited on a silicon nitride (SiN) wafer and patterned to construct nanofluidic channels. The patterned parylene layer was directly bonded to another SiN wafer by thermal surface activation and bonding, with a bonding strength of ∼3 MPa. Fourier transform infrared spectroscopy showed that carbon–oxygen bonds were generated by thermal activation. We demonstrated TEM imaging of gold nanoparticles suspended in liquid using the fabricated nanofluidic chip.</P>
이원희(Wonhee Lee),김동수(Dongsoo Kim),김정수(Jungsoo Kim),이민철(Mincheol Lee),장민호(Minho Jang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The digital three dimensional (3D) real object duplication system (RODS) consist of a optical 3D scanner and a solid freeform fabrication (SFF) system for office type. It can scan a 3D object rapidly, transmit data to other system and reproduce the copy thereof rapidly. In this research, full automatic 3D scanner and SFF system was developed. The 3D scanner has the motion stage of four axes. And the SFF system developed based on three dimensional printing (3DP) process. Also, the performance of developed system was evaluated. As the result, the duplication error of part was 300,㎛(X), 300,㎛ (Y), and 800,㎛(Z) respectively.