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Acoustic Duct 내부에 장착된 아이오노머의 이온기 변화에 따른 흡음패턴 측정
장순석,김준섭,이제형,박재철 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.2
Nowadays, as the industrial technology and instrumentation are developed, the interest of the characteristic improvement of sound absorbing materials is rising. Recently new sound absorbing materials are being developed and manufactured for commercialization. But most of sound absorbing materials are polymer-typed or are fabricated by polymers (mixtures of polymer and glass fiber, asbestos...) for better physical characteristic. However, there was not much research about sound absorption change by the change of the ionic nature. In this paper, I composed polymers that include alkaline or acid, or other polymer that have the ionic nature to improve sound absorption characteristic and searched the characteristic pattern of the sound absorption of polymer. I used probe microphone instead of 1/4 condenser microphone such as two- microphone method in order to measure in-duct absorption coefficient of specimen of ionomers that are thin and small so that measuring absorption coefficient is not well defined.
Nanosilver Colloids-Filled Photonic Crystal Arrays for Photoluminescence Enhancement
Park, Seong-Je,Lee, Soon-Won,Jeong, Sohee,Lee, Ji-Hye,Park, Hyeong-Ho,Choi, Dae-Geun,Jeong, Jun-Ho,Choi, Jun-Hyuk Springer 2010 Nanoscale research letters Vol.5 No.10
<P>For the improved surface plasmon-coupled photoluminescence emission, a more accessible fabrication method of a controlled nanosilver pattern array was developed by effectively filling the predefined hole array with nanosilver colloid in a UV-curable resin <I>via</I> direct nanoimprinting. When applied to a glass substrate for light emittance with an oxide spacer layer on top of the nanosilver pattern, hybrid emission enhancements were produced from both the localized surface plasmon resonance-coupled emission enhancement and the guided light extraction from the photonic crystal array. When CdSe/ZnS nanocrystal quantum dots were deposited as an active emitter, a total photoluminescence intensity improvement of 84% was observed. This was attributed to contributions from both the silver nanoparticle filling and the nanoimprinted photonic crystal array.</P>
Optimized film processing of nanosilver colloids for photoluminescence enhancement.
Park, Seong-Je,Sohee-Jeong,Park, Hyeong-Ho,Lee, Soon-Won,Jeon, Sohee,Lee, Ji-Hye,Choi, Dae-Geun,Jeong, Jun-Ho,Choi, Jun-Hyuk American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.1
<P>Recently, various research strategies have been employed to improve light extraction efficiency in organic LEDs, including the recent development of localized surface plasmon resonance (LSPR), as well as the more widely-known application of a photonic crystal layer. Here, we report on the development of a process method for forming a two-dimensional nanosilver patterned array to achieve LSPR-coupled light-emission efficiency enhancement. The process scheme involves the spin-coating of nanosilver colloidal ink onto a glass substrate, followed by optimized thermal annealing to create an array of isolated nanosilver islands. The resulting Ag islands are in the size range 50 approximately 80 nm, which is larger than the diameter of the Ag nanoparticles in the colloidal suspension. Then, silicon oxide is thermally sputtered to provide a spacer layer to prevent luminescence quenching of the red-emitting nanocrystal quantum dot (NQD) layer, which is deposited in a subsequent spin-coating process. When the NQD layer is excited, the energy of the photoelectron is confined to the surfaces of the nanosilver islands in the near-field. In this study, the localized surface plasmon resonance peaks were at a wavelength of 625 nm, and out-coupling efficiency was enhanced more than sixfold.</P>
Photo-induced hybrid nanopatterning of titanium dioxide <i>via</i> direct imprint lithography
Park, Hyeong-Ho,Choi, Dae-Geun,Zhang, Xin,Jeon, Sohee,Park, Seong-Je,Lee, Soon-Won,Kim, Sarah,Kim, Ki-don,Choi, Jun-Hyuk,Lee, Jihye,Yun, Dae Keun,Lee, Ki Joong,Park, Hyung-Ho,Hill, Ross Henry,Jeong, J Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.10
<P>A novel ultraviolet (UV)-assisted imprinting procedure that employs photosensitive titanium(<SMALL>IV</SMALL>) di-n-butoxide bis(2-ethylhexanoate) is presented for the fabrication of well-ordered titanium dioxide (TiO<SUB>2</SUB>) nanostructures at room temperature. The main novelty of this technique is the use of the photosensitive titanium organic compound, rather than a commonly used UV-curable resin, for direct UV-assisted nanoimprint lithography. Fourier transform infrared and X-ray photoelectron spectroscopy studies suggest that exposure to UV light resulted in the gradual removal of organic groups from films prepared from titanium(<SMALL>IV</SMALL>) di-n-butoxide bis(2-ethylhexanoate) photochemically and successively converted the films to TiO<SUB>2</SUB> at room temperature. This approach allows direct fabrication of TiO<SUB>2</SUB> nanopatterns with lines down to 35 nm in width, hole arrays of 265 nm in diameter, and three-dimensional TiO<SUB>2</SUB> hybrid micro/nano-patterns without observable defects for use in applications where ordered surface nanostructures are required, such as photovoltaics, photonics, and optical waveguides.</P> <P>Graphic Abstract</P><P>A novel UV-assisted imprinting procedure that employs photosensitive Ti(<SMALL>IV</SMALL>) di-n-butoxide bis(2-ethylhexanoate) is presented for the fabrication of well-ordered TiO<SUB>2</SUB> and 3-D TiO<SUB>2</SUB> hybrid micro/nano-patterns at room temperature. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b921343k'> </P>
기계환기로 인한 백서의 급성 폐손상에서 Matrix Metalloproteinase Inhibitor의 효과
김제형 ( Kim Je Hyeong ),박수연 ( Park Su Yeon ),허규영 ( Heo Gyu Yeong ),이승헌 ( Lee Seung Heon ),이상엽 ( Lee Sang Yeob ),박상면 ( Park Sang Myeon ),서인범 ( Seo In Beom ),신철 ( Sin Cheol ),심재정 ( Sim Jae Jeong ),인광호 ( I 대한결핵 및 호흡기학회 2002 Tuberculosis and Respiratory Diseases Vol.53 No.6
Park, Sung-Joon,Choo, Ji Yung,Lee, Ki Yeol,Kim, Je-Hyeong,Choi, Jung-Woo,Yeom, Suk Keu,Kim, Baek Hyun Korean Cancer Association 2015 Cancer Research and Treatment Vol.47 No.3
<P>Bronchial carcinosarcoma is a very rare malignant tumor that is composed of carcinomatous and sarcomatous elements. We describe the first case in which digital tomosynthesis was useful for the evaluation of airway obstruction by bronchial carcinosarcoma that was overlooked on initial chest radiography.</P>