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Cho, Junsang,Jung, Yun Ku,Lee, Jin-Kyu The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.21
<P>From kinetic experiments monitoring the consumption of chalcogenide precursors by <SUP>31</SUP>P NMR, it could be concluded that the formation rates of metal chalcogenides (M–E, M = Cd or Zn and E = Se or S) were in the order of ZnS < ZnSe < CdS < CdSe when one equivalent of metal oleate (M–OA) precursor reacted with one equivalent of trioctylphosphine chalcogenide (TOP–E) precursor. On the basis of the reactivity differences, various amounts of each precursor molecule could be deliberately chosen to tune the structure of the generated QDs and consequently the emission colors in the entire visible range. The excellent photochemical stability of the gradient alloy QDs could provide evidence that a good overall coverage of the shell on the core part significantly reduced defects due to lattice mismatch.</P> <P>Graphic Abstract</P><P>From kinetic experiments monitoring the consumption of chalcogenide precursors by <SUP>31</SUP>P NMR, it could be concluded that the formation rates of metal chalcogenides (M–E, M = Cd or Zn and E = Se or S) were in the order of ZnS < ZnSe < CdS < CdSe when one equivalent of metal oleate (M–OA) precursor reacted with one equivalent of trioctylphosphine chalcogenide (TOP–E) precursor. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm16448e'> </P>
Error surface-aware modeling algorithm for quarter-pixel motion estimation
Junsang Cho,Suh, J. W.,Gwanggil Jeon,Jooheung Lee,Jechang Jeong IEEE 2012 IEEE transactions on consumer electronics Vol.58 No.3
<P>In this paper, an error surface-considered modeling algorithm for quarter-pixel motion estimation during video encoding is presented. We previously proposed two algorithms: a model-based quarter-pixel motion estimation (MBQME) algorithm and a hierarchical model-based quarter-pixel motion estimation (HMBQME) algorithm. MBQME is an interpolation-free algorithm that has a minimum motion estimation time, while HMBQME has selective interpolation according to the decision process. Consequently, the peak signal-to-noise ratio (PSNR) for HMBQME is better than that of MBQME, but the motion estimation time is also increased. As an alternative method, we propose an error surface-considered modeling algorithm. In this scheme, the tendency of the error surface is first assessed. Using the strength of the edge at the error surface, we can classify the error surface region as plain or textured. For plain regions, interpolation-free and simple-structured modeling is appropriate for the quarter-pixel motion estimation method. In this case, we modified conventional mathematical modeling algorithm suitable for plain region. For textured regions, additional interpolation is needed for more accurate modeling. We calculate the half-pixel SAD values and perform more accurate modeling so as to find the best motion vector (MV). The experimental results show that the proposed scheme has better PSNR performance than any previous algorithms with minimum motion estimation time.</P>
Cho, Junsang,Jung, Yun Ku,Lee, Jin-Kyu,Jung, Hak-Sung American Chemical Society 2017 Langmuir Vol.33 No.45
<P>Recently, quantum dots (QDs) have been successfully developed as efficient color converters for light-emitting diodes (LEDs) display due to excellent optical properties of QDs. Herein, we demonstrate a new approach to form metal oxide layers (or metal oxide coating) on the exterior surface of gradient alloy QDs (the most advanced chemical architecture QDs developed thus far wherein the lattice parameter from the core to shell is changing in a gradient fashion) in order to improve the photochemical stability and photoluminescence efficiency. The resulting CdO-treated QDs are incorporated into polymer matrix films to fabricate a backlight unit as a part of display panel wherein CdO-treated gradient alloy QDs are utilized as color converters upon the blue-LED excitation. The fabricated 9.7 in. iPad 2 tablet liquid crystal display panel exhibited an excellent uniformity in terms of CIE chromaticity, luminance, and bright variation and superb durability test results (maintenance of ca. 110% brightness compared to initial value even after 3 weeks of operation).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2017/langd5.2017.33.issue-45/acs.langmuir.7b03335/production/images/medium/la-2017-03335k_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la7b03335'>ACS Electronic Supporting Info</A></P>
Development of a Real-Time Internal and External Marker Based Gating System for Proton Therapy
Cho, Junsang,Cheon, Wonjoong,Ahn, Sanghee,Lee, Moonhee,Park, Hee Chul,Han, Youngyih Korean Society of Medical Physics 2017 의학물리 Vol.28 No.3
In respiratory-induced proton therapy, the accuracy of tracking system and beam controlling is more important than photon therapy. Therefore, a high accuracy motion tracking system that can track internal marker and external surrogate is needed. In this research, our team has installed internal and external marker tracking system at our institution's proton therapy system, and tested the scanning with gating according to the position of marker. The results demonstrate that the developed in-house external/internal marker based gating system can be clinically used for proton therapy system for moving tumor treatment.
Cho, Junsang,Jung, Yun Ku,Lee, Jin-Kyu,Jung, Hak-Sung American Chemical Society 2017 Langmuir Vol.33 No.15
<P>Highly efficient blue-emitting CdSe-derived core/shell gradient alloy quantum dots (CSGA QDs) with photoluminescence quantum yield (PL QY) of ca. 90% have been synthesized through a facile 'one-pot' approach. CdSe nuclei are initially formed as core and gradient alloy shells such as CdSexS1-x/ZnSeyS1-y simultaneously encapsulate the preformed CdSe core in an energy-gradient fashion eventually followed by coating with ZnS shells due to the faster precursor reaction kinetics of Cd and Se compared to analog of Zn and S. During the formation of core/shell structure, red-shifting of absorption/emission peaks followed by blue-shifting of analogues were observed due to the intradiffusion of sulfur anion to CdSe luminescent.center. In this gradient architecture, interfacial lattice strain can be effectively alleviated, and thus high PL QY (ca. 90%) and enhanced photochemical stability can be achieved. The synthesized blue-emitting gradient alloy QDs with superior optical properties tunable in the range of 450-490 nm can be used for highly efficient blue-emitters and potentially applicable for the fabrication of white-light LEDs.</P>
Cho, Junsang,Cheon, Wonjoong,Ahn, Sanghee,Jung, Hyunuk,Sheen, Heesoon,Park, Hee Chul,Han, Youngyih Oxford University Press 2017 Journal of radiation research Vol.58 No.5
<P><B>Abstract</B></P><P>Target motion–induced uncertainty in particle therapy is more complicated than that in X-ray therapy, requiring more accurate motion management. Therefore, a hybrid motion-tracking system that can track internal tumor motion and as well as an external surrogate of tumor motion was developed. Recently, many correlation tests between internal and external markers in X-ray therapy have been developed; however, the accuracy of such internal/external marker tracking systems, especially in particle therapy, has not yet been sufficiently tested. In this article, the process of installing an in-house hybrid internal/external motion-tracking system is described and the accuracy level of tracking system was acquired. Our results demonstrated that the developed in-house external/internal combined tracking system has submillimeter accuracy, and can be clinically used as a particle therapy system as well as a simulation system for moving tumor treatment.</P>
Yun, Junsang,Song, Yongkwon,Cho, Ikjun,Ko, Yongmin,Kwon, Cheong Hoon,Cho, Jinhan The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.38
<P>One of the most critical issues in electrochromic (EC) films based on transition metal oxides such as tungsten oxides (WOx) is their poor charge transfer property, which is closely related to EC performance. Herein, high-performance EC films with enhanced charge transport are prepared using small-molecule linkers and transparent/conductive nanoparticles (NPs). In this work, oleylamine (OAm)-stabilized WO2.72 nanorods (NRs) and OAm-stabilized indium tin oxide (ITO) NPs are layer-by-layer (LbL)-assembled with small-molecule linkers (tris(2-aminoethyl)amine, TREN) using a ligand-exchange reaction between bulky/insulating OAm ligands and TREN molecules. In this case, there is only one TREN layer between neighboring inorganic components (WO2.72 NRs and/or ITO NPs), resulting in a dramatic decrease in the separation distance. This minimized separation distance as well as the periodic insertion of transparent/conductive ITO NPs can significantly reduce the charge transfer resistance within WO2.72 NR-based EC films, which remarkably improves their EC performance. Compared to EC films without ITO NPs, the formed EC films with ITO NPs exhibit faster switching responses (4.1 times in coloration time and 3.5 times in bleaching time) and a maximum optical modulation of approximately 55.8%. These results suggest that electrochemical performance, including EC performance, can be significantly improved through structural/interfacial designing of nanocomposites.</P>