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Oh, Youngjin,Lee, Wonju,Kim, Donghyun Optical Society of America 2011 Optics letters Vol.36 No.8
<P>We have investigated enhanced surface plasmon resonance detection through colocalization of gold nanoparticle (GNP)-conjugated target molecules and near-fields established by nanograting-based antennas. The target colocalization was implemented by angled dielectric thin-film deposition on the nanograting structure. The concept was tested by detecting DNA hybridization and shows that the colocalization produces an additional 60%-80% increase of resonance shifts. The colocalization involves a much smaller number of target molecules, so that the measured enhancement per molecule by the colocalization of GNP-conjugated DNA oligomers was estimated to be by more than 2 orders of magnitude relative to that of thin-film-based conventional detection.</P>
Recent advances of nanostructure implemented spectroscopic sensors—A brief overview
Oh, Youngjin,Kim, Kyujung,Hwang, Seonhee,Ahn, Heesang,Oh, Jin-Woo,Choi, Jong-ryul Taylor Francis 2016 Applied spectroscopy reviews Vol.51 No.7
<P>By the conjugation of requirements of high-performance sensing platforms and developments of nanotechnology, various nanostructure implemented photonic, spectroscopic sensors have been investigated. In this review article, we address 3 types of nanostructure implemented optical sensor techniques-localized surface plasmon resonance (LSPR) sensors, extraordinary optical transmission (EOT) based sensors, and Raman-based spectroscopic sensors-and recent advances of the nanostructure assisted sensors arranged by 2 important issues: the employment of novel nanostructures and the application of newly investigated fabrication techniques for larger sensing area.</P>
Youngjin Oh,Chesoong Kim,Agassi Melikov 대한산업공학회 2013 Industrial Engineeering & Management Systems Vol.12 No.3
This paper proposes a space merging approach to studying the queuing models with finite buffers and jump priorities. Upon the arrival of a call with low priority, one call of such kind is assumed to be transferred to the end of the queue of high priority calls. The transfer probabilities depend on the state of the queue of the heterogeneous calls. We developed the algorithms to calculate the quality of service metrics of such queuing models, and the results of the numerical experiments are shown.
Oh, Hankook,Park, Ki-Min,Hwang, Hyonseok,Oh, Sihyun,Lee, Ji Hye,Lu, Jia-Sheng,Wang, Suning,Kang, Youngjin American Chemical Society 2013 Organometallics Vol.32 No.21
<P>Facile one-pot synthetic methods for new alkoxo-functionalized heteroleptic cyclometalated Ir(III) compounds have been developed. Nucleophilic substitution of fluorine atoms in [(dfpypy)<SUB>2</SUB>Ir(μ-Cl)]<SUB>2</SUB> (dfpypy = 2′,6′-difluoro-2,3′-bipyridine) by a methoxyethanol in the presence of an ancillary ligand led to the formation of the new alkoxo-functionalized heteroleptic Ir(III) compounds Ir[(RO)<SUB>2</SUB>pypy]<SUB>2</SUB>(N<SUP>∧</SUP>O) in good yields. These compounds have a distorted octahedral geometry around the Ir(III) center with an <I>N,N-trans-meridional</I> configuration. They exhibit intense blue to yellow phosphorescence (λ<SUB>max</SUB> = 453–558 nm) with moderate to excellent quautum efficiencies (0.22 to 0.96). Comparative studies on the fluoro analogues, Ir(dfpypy)<SUB>2</SUB>(N<SUP>∧</SUP>O), were also carried out. Our investigation established that the substitution of a fluorine atom by an alkoxy chain can greatly improve the solubility of the compounds in common organic solvents without significantly altering the emission color and efficiencies, making alkoxy-functionalized Ir(III) compounds potential candidates for use in solution-processable phosphorescence OLEDs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orgnd7/2013/orgnd7.2013.32.issue-21/om400770h/production/images/medium/om-2013-00770h_0014.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/om400770h'>ACS Electronic Supporting Info</A></P>
Evaluation of 3D Data Service Based on Depth Image Based Rendering over T-DMB
Youngjin Oh,Kwanghee Jung,Joong Kyu Kim,Gwangsoon Lee,Hyun Lee,Namho Hur,Jinwoong Kim 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
3D data service over Terrestrial-Digital Multimedia Broadcasting (T-DMB) is very attractive because the single user environment of T-DMB is suitable to glassless 3D viewing. However, the bit budget for transmission of additional 3D data over T-DMB is very limited with 32Kbps through data service channel. To overcome this limited condition, Depth-Image-Based-Rendering (DIBR) can be applied, because corresponding depth sequence is only additionally needed to current TDMB and this can be compressed effectively. Therefore, in this paper, we evaluate 3D data service based on DIBR over T-DMB. Evaluation mainly consists of two experiments. One is to evaluate the coding efficiency of depth sequences and the other is to measure the subjective quality and percived depth of auto-stereosopic image generated by DIBR with coded depth sequence. Therefore, we evaluate the possibility of transmitted depth image through data service channel that transmission rate is 32Kbps. Evaluation results show that DIBR can efficiently be utilized for 3D data service over T-DMB. However, it is also shown that the development of some techniques such as the depth preprocessing is required for the improvement of image quality.
Oh, Youngjin,Kim, Chesoong,Melikov, Agassi Korean Institute of Industrial Engineers 2013 Industrial Engineeering & Management Systems Vol.12 No.3
This paper proposes a space merging approach to studying the queuing models with finite buffers and jump priorities. Upon the arrival of a call with low priority, one call of such kind is assumed to be transferred to the end of the queue of high priority calls. The transfer probabilities depend on the state of the queue of the heterogeneous calls. We developed the algorithms to calculate the quality of service metrics of such queuing models, and the results of the numerical experiments are shown.
Oh, Youngjin,Son, Taehwang,Kim, Sook Young,Lee, Wonju,Yang, Heejin,Choi, Jong-Ryul,Shin, Jeon-Soo,Kim, Donghyun Optical Society of America 2014 Optics express Vol.22 No.22
<P>The feasibility of super-resolution microscopy has been investigated based on random localization of surface plasmon using blocked random nanodot arrays. The resolution is mainly determined by the size of localized fields in the range of 100-150 nm. The concept was validated by imaging FITC-conjugated phalloidin that binds to cellular actin filaments. The experimental results confirm improved resolution in reconstructed images. Effect of far-field registration on image reconstruction was also analyzed. Correlation between reconstructed images was maintained to be above 81% after registration. Nanodot arrays are synthesized by temperature-annealing without sophisticated lithography and thus can be mass-produced in an extremely large substrate. The results suggest a super-resolution imaging technique that can be accessible and available in large amounts.</P>
Kim, Youngjin,Koo, Dongho,Ha, Seongmin,Jung, Sung Chul,Yim, Taeeun,Kim, Hanseul,Oh, Seung Kyo,Kim, Dong-Min,Choi, Aram,Kang, Yongku,Ryu, Kyoung Han,Jang, Minchul,Han, Young-Kyu,Oh, Seung M.,Lee, Kyu T American Chemical Society 2018 ACS NANO Vol.12 No.5
<P>Lithium-oxygen (Li-O<SUB>2</SUB>) batteries are desirable for electric vehicles because of their high energy density. Li dendrite growth and severe electrolyte decomposition on Li metal are, however, challenging issues for the practical application of these batteries. In this connection, an electrochemically active two-dimensional phosphorene-derived lithium phosphide is introduced as a Li metal protective layer, where the nanosized protective layer on Li metal suppresses electrolyte decomposition and Li dendrite growth. This suppression is attributed to thermodynamic properties of the electrochemically active lithium phosphide protective layer. The electrolyte decomposition is suppressed on the protective layer because the redox potential of lithium phosphide layer is higher than that of electrolyte decomposition. Li plating is thermodynamically unfavorable on lithium phosphide layers, which hinders Li dendrite growth during cycling. As a result, the nanosized lithium phosphide protective layer improves the cycle performance of Li symmetric cells and Li-O<SUB>2</SUB> batteries with various electrolytes including lithium bis(trifluoromethanesulfonyl)imide in <I>N,N</I>-dimethylacetamide. A variety of <I>ex situ</I> analyses and theoretical calculations support these behaviors of the phosphorene-derived lithium phosphide protective layer.</P> [FIG OMISSION]</BR>