D. H. Yoon

Sungkyunkwan University, Sŏul, Seoul, South Korea

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Publications (232)387.86 Total impact

  • M.J. Lee · S.H. Park · Y.H. Song · E.K. Ji · U.B. Humayoun · D.B. Lee · D.H. Yoon ·
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    ABSTRACT: Lu3Al5O12:Ce3+ phosphor ceramic plates can be combined with blue chips to produce white light emitting diodes (WLEDs). Lu3Al5O12:Ce3+ was synthesized using a solid state reaction and was sintered under a reduction atmosphere. The phosphor ceramic plates exhibited good thermal effects with a Lu3Al5O12:Ce3+ phosphor ceramic plates of varying thickness. Lu3Al5O12:Ce3+ phosphor ceramic plates also exhibited quenching properties at extraordinarily high temperatures. We suggest that Lu3Al5O12:Ce3+ phosphor ceramic plates can be a candidate for next-generation high-power LEDs.
  • Hyewon Ryu · S. Kim · K. Lee · C. Suh · D.H. Yoon ·

  • Y. H. Song · M. J. Lee · Y. L. Song · G. S. Han · H. S. Jung · D. H. Yoon ·
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    ABSTRACT: A facile synthetic technique for producing high-quality red-emitting Sr2Si5N8 : Eu2+ phosphor was successfully prepared at 1600 C for 5 hours under an unpressurized 5%H2/95%N2 atmosphere. The prepared Sr2Si5N8 : Eu2+ phosphor showed broadband emission spectra as well as higher emission intensity than the conventional Sr2Si5N8 : Eu2+ phosphor. The phosphor-converted LED with Sr2Si5N8 : Eu2+ by facile synthetic route showed an increase of quantum efficiency of 10% with a high color rendering index value (>90). Therefore, we expect this synthetic technique to be a candidate for enhancing the photoluminescence properties of nitride phosphor.
    Science of Advanced Materials 08/2015; 7(8). DOI:10.1166/sam.2015.2360 · 2.60 Impact Factor
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    ABSTRACT: Autophagy is crucial for the survival and function of plasma cells including protection from toxic misfolded immunoglobulin and proper energy metabolism. Multiple myeloma (MM) is an indolent but eventually fatal neoplasm of plasma cells. Autophagy may play a critical role in the survival of MM cells and their response to chemotherapeutic agents. In this study, we correlated the expression of autophagy-related proteins with the prognosis of MM. In this retrospective cohort study, we examined the expression of the autophagic markers BECLIN 1 and microtubule-associated protein light chain 3 (LC3) in 89 cases of MM biopsied from 2001 to 2004 at the Asan Medical Center. The association of the expression scores of these markers with clinical outcomes was assessed. Patients with strong immunoreactivity to BECLIN 1 or LC3 had a significantly better overall survival (OS) than patients with negative to moderate immunoreactivity (p = 0.036 and 0.018, respectively). This was also true for disease-specific survival (DSS; p = 0.051 and 0.043, respectively). In addition, LC3 immunostaining remained an independent factor impacting OS (p = 0.028) and DSS (p = 0.020) after multivariate analysis. The results of this study suggest that higher immunoreactivity for autophagic markers in MM is associated with superior patient survival. © 2015 S. Karger AG, Basel.
    Acta Haematologica 04/2015; 134(1):17-24. DOI:10.1159/000368848 · 1.12 Impact Factor
  • M. J. Lee · Y.H. Song · Y.L. Song · G. S. Han · H. S. Jung · D. H. Yoon ·
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    ABSTRACT: We demonstrate a simple method of K2SiF6:Mn4+ red phosphor and discuss its promising application in warm-white lighting emitting diodes. The K2SiF6:Mn4+ was synthesized from SiO2 powders through redox reaction in HF/KMnO4 solution. To further increase emission efficiency, KF was introduced in the solution. An intense absorption band in blue and a bright emission in red indicated the phosphor K2SiF6:Mn4+. This phosphor and the synthesis method are expected to be promising candidates for application in white LEDs.
    Materials Letters 02/2015; 141. DOI:10.1016/j.matlet.2014.11.025 · 2.49 Impact Factor
  • J Y Hong · D H Yoon · C Suh · J Huh · I-G Do · I Sohn · J Jo · S-H Jung · M E Hong · H Yoon · Y H Ko · S J Kim · W S Kim ·
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    ABSTRACT: Epstein-Barr virus (EBV)-positive diffuse large B-cell lymphoma (DLBCL) of the elderly is defined only in adults older than 50 years. However, EBV-positive DLBCL can affect younger patients. We investigated the prevalence, clinical characteristics and survival outcomes of EBV-positive DLBCL in young adults. We analyzed patients with de novo DLBCL who were registered in the Samsung Medical Center (SMC) retrospective lymphoma cohort and prospective SMC Lymphoma Cohort Study I (ClinicalTrials.gov: NCT00822731). A total of 571 cases were included in the analysis. The prevalence of EBV positivity was 6.7% (13/195) and 9.3% (35/376) in the young group (≤ 50) and in the elderly group (>50), respectively. EBV status was closely associated with unique unfavorable clinical characteristics (older age, more advanced stage, two or more sites of extranodal involvement, higher IPI and age-adjusted IPI risk) only in the elderly group. Poor prognostic impact of EBV positivity on overall survival was observed only in the elderly group (HR 2.86; 95% CI, 1.83-4.47; P<0.001), but not in the young group (HR 1.17; 95% CI, 0.35-3.89; P=0.801). A substantial proportion of EBV-positive DLBCL of the elderly can occur in young adults. EBV positivity of DLBCL in young adults was not associated with unfavorable clinical characteristics or worse outcomes. We suggest that EBV-positive DLBCL should not be confined only in the elderly and "EBV-positive DLBCL in young adults" needs to be considered as a clinically distinct disease entity. This study is registered with ClinicalTrials.gov, number NCT02060435. © The Author 2014. Published by Oxford University Press on behalf of the European Society for Medical Oncology. All rights reserved. For permissions, please email: journals.permissions@oup.com.
    Annals of Oncology 12/2014; 26(3). DOI:10.1093/annonc/mdu556 · 7.04 Impact Factor
  • M G Hur · T Masaki · D H Yoon ·
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    ABSTRACT: Tin (Sn) and tungsten (W) co-doped vanadium dioxide (VO2) nanostructured thin films with 50-nm thickness were deposited by pulsed laser deposition (PLD) to reduce the transition temperature and improve the IR transmittance. The crystal structure of the nanostructured thin films and the presence of elements were evaluated by XRD and XPS analysis. The transition temperature (Tc ) of 1 at% Sn–1 at% W co-doped VO2 nanostructured thin film was decreased to about 22 °C (from 70.3 to 48.5 °C) compared with the undoped VO2 nanostructured thin film. The transmittance width in the IR range of the co-doped nanostructured thin film decreased from 37.5% to 27% compared with the undoped VO2 nanostructured thin film. Also, the width of hysteresis was narrowed by Sn doping.
    Journal of Nanoscience and Nanotechnology 12/2014; 14(12):8941-5. DOI:10.1166/jnn.2014.10054 · 1.56 Impact Factor
  • Source
    S. Kim · J.S. Park · S.W. Oh · H. Kwon · D.H. Yoon · K. Lee · C.M. Lee ·

    Public Health 10/2014; 128(11). DOI:10.1016/j.puhe.2014.09.002 · 1.43 Impact Factor
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    ABSTRACT: Pure and Eu3+ doped β-Ga2O3 hollow nanostructures were synthesized by hydrothermal and calcination processes using carbon spheres as templates in ethanol–water solution. Field-emission scanning electron microscopy and high-resolution transmission electron microscopy analysis revealed β-Ga2O3 hollow nanostructures with diameters of approximately 200 nm and shell thickness of about 20 nm. The X-ray diffraction analysis revealed that the carbon@Ga(OH)CO3 core–shell nanostructures were in amorphous phase before calcination. After calcination, the amorphous core–shell structures yielded highly crystalline β-Ga2O3 hollow nanostructures with spherical shape. The presence of the Ga(OH)CO3 in the shell components is confirmed by the Fourier transform infrared spectrum. The Eu3+ doped β-Ga2O3 hollow nanostructures showed strong red emission corresponding to the 5D4 → 7FJ transition.
    Materials Chemistry and Physics 09/2014; 147(s 1–2):178–183. DOI:10.1016/j.matchemphys.2014.04.025 · 2.26 Impact Factor
  • J H Park · D H Yoon · D Y Kim · S Kim · S Seo · Y Jeong · S W Lee · C S Park · J Huh · C Suh ·
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    ABSTRACT: Although the International Prognostic Index (IPI) is considered as the current standard prognostication system for diffuse large B-cell lymphoma (DLBCL), prognostic heterogeneity is suggested to exist among the patients within the same IPI risk group. Hence, we investigated the pattern of distribution and prognostic impact of five IPI factors within the same IPI score. We retrospectively reviewed the medical records of 387 patients newly diagnosed as pathologically proven DLBCL between February 2002 and February 2010. We classified patients to IPI risk scores and categorized them according to the combinations of IPI. Then, we explored the frequency of five IPI factors and analyzed the correlation between these subgroups and efficacy outcomes: complete response (CR), event-free survival (EFS), and overall survival (OS). Survival estimates by IPI score in this cohort corresponded to the classic IPI. Elevated serum level of lactate dehydrogenase (LDH) was the most prevalently distributed factor throughout the scores, and patients with elevated serum level of LDH tended to have lower CR, inferior EFS, and/or OS irrespective of IPI scores. Particularly, among the subgroups of IPI score of 2, elevated serum level of LDH was significantly associated with inferior CR (73.1 vs 95.2 %), 3-year EFS (57 vs 87 %), and 3-year OS (58 vs 82 %). In addition, the higher serum level of LDH, particularly above 2,000 IU/L, was significantly correlated with the inferior survival outcomes (3-year EFS 78.0 vs 58.5 vs 45.5 vs 20.0 %, 3-year OS 86.0 vs 66.2 vs 58.2 vs 40.0 %). In conclusion, among five factors of IPI, elevated serum level of LDH seems to be the most frequently distributed and, more importantly, the most relevant IPI factor with the highest prognostic impact. These findings still warrant further validation in larger cohorts.
    Annals of Hematology 07/2014; 93(10). DOI:10.1007/s00277-014-2115-z · 2.63 Impact Factor
  • W.Q. Chen · D.S. Jo · Y. H. Song · T. Masaki · D.H. Yoon ·
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    ABSTRACT: Trivalent cerium Ce3+-doped YAG (Y2.94Ce0.06Al5O12) phosphors were synthesized by solid-state reaction, liquid-phase precursor, co-precipitation, and drying methods. The specimen obtained by the LPP method showed the highest emission intensity among the four methods and fired at 1400 degrees C firing, and the intensity was approximately 180% higher compared with a commercial product. The phosphors obtained by the LPP method showed more homogeneous, agglomerate-free, nearly spherical particles.
    Journal of Luminescence 02/2014; 147. DOI:10.1016/j.jlumin.2013.10.006 · 2.72 Impact Factor
  • D.S. Choi · S.H. Han · H. Kim · T.Y. Kim · S.H. Rhyu · D.H. Yoon · W.S. Yang ·
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    ABSTRACT: Electrochromism in amorphous tungsten oxide films, lasting and reversible color change to dark blue, is up to injection or withdrawal of electrons. Indium tin oxide (ITO) is widely used as the transparent electrodes for electrochromic devices. We sputtered a-WOx film on indium tin oxides (ITO) coated flexible polyelthylene terephthalate (PET) substrate. The sheet resistance of ITO/PET is 200 Ohm/sq. To determine optimum condition, we deposited the films under various partial pressures of oxygen and exposure time for adjusting the thickness of the film at room temperature. Optical properties were checked with optical transmittance and Raman spectroscopy of WO3 film depending on various O2 pressure. We verified the best condition when WO3 film was deposited on ITO/PET substrate with 2% O2 partial pressure and the EC property for graphene /PET application.
    Journal of Ceramic Processing Research 01/2014; 15(4):273-276. · 0.34 Impact Factor
  • Y. H. Song · E. J. Chung · M. K. Jung · K. Senthil · T. Masaki · D. H. Yoon ·
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    ABSTRACT: To synthesize green-emitting SrSi2O2N2 phosphor, boron-coated Eu2O3 was used as an activator with different crucibles. This phosphor showed higher emission intensity than phosphor obtained using boron nitride and an alumina crucible. The synthesized green-emitting phosphors obtained using a carbon crucible were crystallized much better and showed higher emission intensity. The emission spectra typically showed a single broad green emission band corresponding to the 5d -> 4f transition of Eu2+ ions under excitation of 450 nm. This green-emitting phosphor is expected to be applied to next-generation white LEDs.
    Journal of Ceramic Processing Research 01/2014; 15(3):204-206. · 0.34 Impact Factor
  • B. K. Kang · S. R. Mang · K. M. Song · K. S. Lee · D. H. Yoon ·
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    ABSTRACT: This study examined the preparation of monoclinic beta-Ga2O3 hollow nanostructures with various firing temperatures ranging from 500 to 900 degrees C by using hydrothermal and calcination processes. The X-ray diffraction patterns indicate that beta-Ga2O3 hollow nanostructures were synthesized at temperatures over 600 degrees C. The Ga(OH)CO3 components of the shell were confirmed by Fourier transform infrared spectrometry. An investigation with field-emission scanning electron microscopy indicated a white body color of beta-Ga2O3 hollow nanostructures at 800 degrees C with diameters of about 200 nm. However, the sample calcined at 500 degrees C showed brown body color and was not perfectly crystallized. The cathodoluminescence spectrum revealed blue emission at 300-500 nm, which was assigned to vacancies in beta-Ga2O3 hollow nanostructures.
    Journal of Ceramic Processing Research 01/2014; 15(3):200-203. · 0.34 Impact Factor
  • Y.H. Song · E.J. Chung · S. H. Song · M. K. Jung · K. Senthil · T. Masaki · D. H. Yoon ·
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    ABSTRACT: A novel method to enhance the (Ba2-xSrx)SiO4 phosphors used for white LEDs was developed by using Eu2O3@B2O3 core-shells as an activator. This phosphor using Eu2O3@B2O3 core-shell showed twice as emission intensity as phosphor doped with Eu2+ alone. The synthesized green-emitting phosphors using carbon sheet showed much better crystallization as well as higher emission intensity. The emission spectra showed a typically broad green emission band attributed to the 5d -> 4f transition of Eu2+ ions under excitation at 420 nm. This phosphor is expected to be suitable to a wide range of quickly growing applications, and could be a promising phosphor for white LEDs.
    Materials Letters 11/2013; 110:34-37. DOI:10.1016/j.matlet.2013.07.093 · 2.49 Impact Factor
  • N. D. Nam · M. J. Kim · D. S. Jo · J. G. Kim · D. H. Yoon ·
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    ABSTRACT: The coating performance can be improved by reducing the number of defects of a coating by layering two materials on the nanometer scale. In this study, Ti/TiN, Cr/TiN, Ti/CrN, and Cr/CrN multilayer coatings were examined to determine the corrosion resistance of the multi-coating system and to obtain information on the appropriate materials for bipolar plates in proton exchange membrane fuel cells. The results showed that the Cr/CrN coating gains excellent coating performance due to the lowest passive current density as well as the highest protective efficiency and charge transfer resistance. X-ray diffraction analysis confirmed the formation of a preferred (111) orientation along with crystalline-refined (200).
    Thin Solid Films 10/2013; 545:380-384. DOI:10.1016/j.tsf.2013.07.056 · 1.76 Impact Factor
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    ABSTRACT: The objective of this study was to investigate single nucleotide polymorphisms (SNPs) in the bovine nephroblastoma overexpressed (NOV) gene and to evaluate whether these polymorphisms affect carcass traits in the Korean cattle population. We resequenced to detect SNPs from 24 unrelated individuals and identified 19 SNPs within the full 8.4-kb gene, including the 1.5-kb promoter region. Of these 19 SNPs, four were selected for genotyping based on linkage disequilibrium (LD). We genotyped 429 steers to assess the associations of these four SNPs with carcass traits. Statistical analysis revealed that g.7801T>C and g.8379A>C polymorphisms in the NOV gene were associated with carcass weight (p = 0.012 and 0.008, respectively), and the g.2005A>G polymorphism was associated with the back fat thickness (BF) trait (p = 0.0001). One haplotype of the four SNPs (GGTA) was significantly associated with BF (p = 0.0005). Our findings suggest that polymorphisms in the NOV gene may be among the important genetic factors affecting carcass yield in beef cattle.
    Asian Australasian Journal of Animal Sciences 06/2013; 26(6). DOI:10.5713/ajas.2012.12514 · 0.54 Impact Factor
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    ABSTRACT: Aim: To investigate the computed tomography (CT) findings in patients with stage IE/IIE extranodal natural killer/T-cell lymphoma (ENKTL) arising in the nasal cavity and to evaluate whether imaging findings revealed by CT have prognostic value. Materials and methods: The CT findings of 62 patients diagnosed with IE/IIE ENKTL arising in the nasal cavity were retrospectively reviewed. Imaging findings were investigated, and evaluated imaging findings were analysed for the prognostic value of overall survival (OS) and disease-free survival (DFS). Results: Of the 62 patients, 21 (34%) presented with a superficial infiltrative, 38 (61%) with a mass forming, and three (5%) with a combined pattern. Of all imaging findings, local invasiveness (n = 26, 42%), including bony destruction, erosion, or soft-tissue involvement, was the only independent prognostic factor for OS [p = 0.008; hazard ratio (HR): 3.85; 95% confidence intervals (CI): 1.42-10.44] and DFS (p = 0.001; HR: 4.25; 95% CI: 1.72-10.47). In a subgroup analysis of 36 cases with no local invasiveness, a superficial infiltrative pattern in one nasal cavity was a positive prognostic factor for OS (p = 0.028) and DFS (p = 0.008). Conclusion: Imaging findings at CT provided clinically useful predictions for treatment outcomes. Local invasiveness revealed by CT findings was a strong prognostic factor for poor OS and DFS. In addition, in patients with no local invasiveness, a superficial infiltrative pattern in one nasal cavity predicted favourable OS and DFS.
    Clinical Radiology 03/2013; 68(7). DOI:10.1016/j.crad.2012.11.023 · 1.76 Impact Factor
  • C. H. Jung · H. I. Kang · D. H. Yoon ·
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    ABSTRACT: The electrical, optical, and structural properties of amorphous indium gallium zinc oxide (a-IGZO) films deposited at room temperature (RT) examined before and after annealing using a radio frequency (RF) magnetron sputtering system with different hydrogen and oxygen gas flow ratios. The carrier concentration and resistivity of the a-IGZO films fabricated under O2/Ar + O2 and O2/Ar–4%H2 + O2 atmospheres were greatly dependent on the addition of hydrogen and heat treatment. Thin-film transistors (TFTs) with an a-IGZO channel layer deposited under O2/Ar–4%H2 + O2 = 1.6% exhibited good subthreshold gate voltage swing (S), on/off ratio, threshold voltage and μFE of 0.4 V decade−1, 108, 0.3 V and 4.8 cm2 V−1 s−1, respectively. From analysis of the interfacial structure in TFTs before and after annealing, the electrical conductivity of the a-IGZO channel layer was greatly affected in regard to TFT performance due to the amorphous a-IGZO channel layer and SiO2 gate insulator.
    Solid-State Electronics 01/2013; 79:125–129. DOI:10.1016/j.sse.2012.10.002 · 1.50 Impact Factor

  • 10th Annual Meeting of the Japanese-Society-of-Medical-Oncology (JSMO); 10/2012

Publication Stats

2k Citations
387.86 Total Impact Points


  • 1999-2015
    • Sungkyunkwan University
      • School of Advanced Materials Science and Engineering (AMSE)
      Sŏul, Seoul, South Korea
  • 2014
    • Seoul National University Hospital
      • Department of Family Medicine
      Sŏul, Seoul, South Korea
  • 2009-2014
    • Ulsan University Hospital
      Urusan, Ulsan, South Korea
    • Asan Medical Center
      • Department of Oncology
      Sŏul, Seoul, South Korea
  • 2008-2014
    • University of Ulsan
      • College of Medicine
      Urusan, Ulsan, South Korea
    • Kyungpook National University
      Daikyū, Daegu, South Korea
  • 2013
    • National Institute of Animal Science
      Sŏul, Seoul, South Korea
  • 2012
    • Chi-Mei Medical Center
      臺南市, Taiwan, Taiwan
  • 2011
      Seikan-ri, Chungcheongnam-do, South Korea
  • 2006-2007
    • Hankyong National University
      • Genomic Information Center
      Anjŏ, Gyeonggi-do, South Korea
    • Yonsei University Hospital
      Sŏul, Seoul, South Korea
  • 2005-2007
    • National Institute of Ecology
      Songhae, Gyeonggi-do, South Korea
  • 2004
    • Chungnam National University
      Daiden, Daejeon, South Korea
  • 2000
    • University of Suwon
      Suigen, Gyeonggi Province, South Korea
  • 1996
    • Iwate University
      • Faculty of Engineering
      Morioka, Iwate, Japan
  • 1994-1995
    • Tohoku University
      • Institute for Materials Research