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Innovative Design and Integrated Manufacturing Laboratory at Seoul National University
Sung-Hoon Ahn,Won-Shik Chu,Varsha Khare,Gil-Yong Lee,Wei Wang,Dong-Hyeon Kim,Sung-Ik Park,Min-Woo Han,Hyun-Taek Lee,Min-Cheol Kim,Jang-Yeob Lee,Hyung-Soo Kim,Min-Soo Kim,Kang-In Lee,Ying Jun Quan,Ji-H 한국생산제조학회 2016 한국생산제조시스템학회 학술발표대회 논문집 Vol.2016 No.10
Kim, Mounggon,Jeon, Sang Kyu,Hwang, Seok-Ho,Lee, Jun Yeob Elsevier 2015 Synthetic metals Vol.209 No.-
<P><B>Abstract</B></P> <P>A bicarbazole based donor–acceptor compound, 4,4′-([3,4′-bicarbazole]-9,9′-diyl)dibenzonitrile (4CN34BCz), was synthesized as a host material for thermally activated delayed fluorescent emitter and the device performances of the green devices with the synthesized host and (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN) delayed fluorescent emitter were investigated. 4CN34BCz with CN unit at <I>para</I>-position could effectively assist delayed fluorescent emission of 4CzIPN and achieved a high external quantum efficiency of 20.8% compared to 13.8% of the similar host with CN unit at <I>meta</I>-position because the orientation of the CN functional group at <I>para</I> position of the benzonitrile was favourable for charge balance in the emitting layer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A bicarbazole derived host material with a benzonitrile substituent showed bipolar charge transport properties. </LI> <LI> A high external quantum efficiency above 20% was obtained in green thermally activated delayed fluorescent device. </LI> <LI> Para substitution of CN was better than metal substitution for high efficiency. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Optical parameters of boron-doped ZnO nanorods grown by low-temperature hydrothermal reaction.
Kim, Soaram,Park, Hyunggil,Nam, Giwoong,Yoon, Hyunsik,Kim, Younggyu,Kim, Byunggu,Ji, Iksoo,Kim, Jong Su,Kim, Jin Soo,Kim, Do Yeob,Kim, Sung-O,Leem, Jae-Young American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.11
<P>Sol-gel spin-coating was used to deposit ZnO seed layers onto quartz substrates, and ZnO nanorods doped with various concentrations of B (i.e., BZO nanorods) ranging from 0 to 2.0 at% were hydrothermally grown on the ZnO seed layers. The effects of B doping on the absorption coefficient, optical band gap, Urbach energy, refractive index, extinction coefficient, single-oscillator energy, dispersion energy, average oscillator strength, average oscillator wavelength, dielectric constant, and optical conductivity of the hydrothermally grown BZO nanorods were investigated. The optical band gaps were 3.255, 3.243, 3.254, 3.258, and 3.228 eV for the nanorods grwon at 0, 0.5, 1.0, 1.5 and 2.0 at% B, respectively. B doping increased the Urbach energy from 40.7 to 65.1 meV for the nanorods grown at 0 and 2.0 at% B, respectively, and significantly affected the dispersion energy, the single-oscillator energy, the average oscillator wavelength, the average oscillator strength, the refractive index, and the optical conductivity of the hydrothermally grown BZO nanorods.</P>
Kim, Sung Moo,Byeon, Sung Yong,Hwang, Seok-Ho,Lee, Jun Yeob The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.53
<P>A novel carbazole moiety with bromine at the 1-position of carbazole was synthesized and four carbazole compounds derived from the 1-position modified carbazole were developed as the host materials for phosphorescent organic light-emitting diodes. The 1-position modified carbazole was coupled with another carbazole to prepare bicarbazole intermediates, which were substituted with 4,6-diphenyltriazine to yield four bicarbazole derivatives modified with the electron deficient diphenyltriazine unit. The triplet host materials showed high quantum efficiency above 20% and low driving voltage below 5.0 V at 1000 cd m<SUP>−2</SUP> in green phosphorescent organic light-emitting diodes.</P> <P>Graphic Abstract</P><P>A novel carbazole moiety with bromine at the 1-position of carbazole was synthesized and four carbazole compounds derived from the 1-position modified carbazole were developed as the host materials for phosphorescent organic light-emitting diodes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cc02188j'> </P>
Statistical analysis of sloshing-induced random impact pressures
Kim, Sang-Yeob,Kim, Yonghwan,Kim, Kyong-Hwan SAGE Publications 2014 Proceedings of the Institution of Mechanical Engin Vol.228 No.3
<P>This article presents the statistical analysis of sloshing-induced random impact pressure. To obtain the pressure signal, three-dimensional sloshing model tests were conducted at two different filling depths. Several different methods were applied to identify sloshing peaks and to define the rise and decay times of the peak pressure signals. Statistical properties acquired from these methods were compared, and their consistency and/or discrepancy were observed. In addition, 200-h duration test data were acquired by running forty 5-h tests under each test condition. Based on the long-duration test data, the uncertainty of the test results with respect to the test duration was studied using the bootstrap method.</P>
Numerical analysis of flow distribution for combined weapon system in environmental tester
Sung Dae Kim,Sang-Hwa Baek,Tae-Yeob Kang,박소진,Chulju Kim,고한서 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.10
Thermal behaviors of combined weapon systems were analyzed by developed computational programs in this study. Also, temperature distributions of the materials of the system were measured according to the experimental conditions. Field tests that reflected the calculated thermal flow characteristics and the measured temperature distributions of the materials were prepared in a large environmental tester for the weapon systems. Boundary conditions of the analysis were the inlet and outlet conditions of the environmental tester and the low temperature limit of -32°C. The soaking time of the system, including a fuel tank and a battery in the environmental tester, was obtained by the programs developed in this study to carry out the experiment in the predicted conditions.
Worst-Case User Analysis in Poisson Voronoi Cells
Sang Yeob Jung,Hyun-kwan Lee,Seong-Lyun Kim IEEE 2013 IEEE COMMUNICATIONS LETTERS Vol.17 No.8
<P>In this letter, we focus on the performance of a worst-case mobile user (MU) in the downlink cellular network. We derive the coverage probability and the spectral efficiency of the worst-case MU using stochastic geometry. Through analytical and numerical results, we draw out interesting insights that the coverage probability and the spectral efficiency of the worst-case MU decrease down to 23% and 19% of those of a typical MU, respectively. By applying a coordinated scheduling (CS) scheme, we also investigate how much the performance of the worst-case MU is improved.</P>
Photoluminescence properties of defect emissions in Al-doped ZnO nanorod array thin films.
Kim, Soaram,Nam, Giwoong,Park, Hyunggil,Yoon, Hyunsik,Kim, Min Su,Kim, Do Yeob,Kim, Sung-O,Leem, Jae-Young American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.9
<P>The power- and temperature-dependent photoluminescence properties of Al-doped ZnO nanorod array thin films grown by the hydrothermal method were investigated. The intensities of both the near-band-edge emission (NBE) and deep-level emission (DLE) as well as the overall spectral line shape were strongly affected by the excitation power. At low excitation power, the blue emission was found to show the highest intensity among the different emission lights. A low-temperature photoluminescence analysis revealed the bound-exciton-related luminescence peak at 3.362 eV. The dependence of peak energy with the excitation power indicates that these DLE processes are generated by DAP transitions. The overall intensity of DLE was found to decrease as the temperature increases. With regard to the blue emission (around 2.52 eV), it showed a well-pronounced shoulder at 200 K. The activation energy for this blue emission was 51.93 meV, which corresponds to the thermal dissociation energy required for the donor-acceptor pair transitions.</P>
Occurrence of Sclerotinia Rot in Four Leguminous Crops Caused by Sclerotinia sclerotiorum
Kim, Wan-Gyu,Hong, Sung-Kee,Lee, Sang-Yeob The Korean Society of Plant Pathology 2006 Plant Pathology Journal Vol.22 No.1
Four leguminous crops grown in greenhouses and fields in Korea were surveyed from 2000 through 2002. Sclerotinia rot most severely occurred up to $60\%$ in Phaseolus vulgaris grown in greenhouses but occurred as low as $0-0.5\%$ in that grown in fields. Incidence of the disease in Pisum sativum grown in greenhouses ranged $1-5\%$, and that in Vicia Java and Vigna sinensis grown in fields was $0.8\%$ and $2\%$, respectively. Symptoms of Sclerotinia rot commonly developed on stems and pods of the crops. A total of 59 isolates of Sclerotinia species were obtained from diseased stems and pods of the crops. All of the isolates were identified as Sclerotinia sclerotiorum based on their morphological characteristics. Eight isolates of the fungus were tested for their pathogenicity to four host crops by artificial inoculation. All of the isolates induced rot symptoms on stems of the host crops tested, which were similar to those observed in the fields. The pathogenicity tests revealed that there was no significant difference in the susceptibility to the isolates among the leguminous crops tested This is the first formal report that S. sclerotiorum causes the Sclerotinia' rot of the four leguminous crops in Korea.
In Vitro Antagonistic Effects of Bacilli Isolates against Four Soilborne Plant Pathogenic Fungi
Kim, Wan-Gyu,Weon, Hang-Yeon,Lee, Sang-Yeob The Korean Society of Plant Pathology 2008 Plant Pathology Journal Vol.24 No.1
Twenty isolates of Bacillus spp. obtained from livestock manure composts and cotton-waste composts were tested for in vitro antagonistic effects against soilborne plant pathogenic fungi, Fusarium oxysporum, Phytophthora capsici, Rhizoctonia solani AG-4, and Sclerotinia sclerotiorum. Seven isolates of Bacillus spp. had antagonistic effects on mycelial growth of all the isolates of F. oxysporum tested. The bacterial isolate RM43 was the most effective to inhibit the mycelial growth of the fungal isolates. Twelve isolates of Bacillus spp. had antagonistic effects on mycelial growth of all the isolates of P. capsici tested. The bacterial isolates M34 and M47 were very effective to inhibit the mycelial growth of the fungal isolates. Thirteen isolates of Bacillus spp. had antagonistic effects on mycelial growth of all the isolates of R. solani AG-4 tested. The bacterial isolates M27 and M75 were very effective to inhibit the mycelial growth of the fungal isolates. Fourteen isolates of Bacillus sp. had antagonistic effects on mycelial growth of all the isolates of S. sclerotiorum tested. The bacterial isolates M49 and M75 were very effective to inhibit the mycelial growth of the fungal isolates. The antagonistic effects of most Bacillus spp. isolates against the isolates of the four fungi differed depending on the fungal species and the isolates of each fungus. The bacterial isolates M27 and M75 were the most effective to inhibit the mycelial growth of all four fungi.