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( Iksoo Ji ),( Jae-young Leem ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.8
The vapor phase transport (VPT) process is usually used for the growth of one-dimensional nanostructures rather than for film deposition. In this study, for the first time, we report on the fabrication and optical propeties of ZnO film produced by VPT combined with rapid heating. The X-ray diffraction results showed that the intensity of the ZnO (002) peak was the largest, which indicated that the c-axis orientation of the ZnO grains was perpendicular to the substrate. In the photoluminescence (PL) spectra of the ZnO film at 12 K, PL peaks were observed at 3.374, 3.362, 3.319, and 3.242 eV, which were attributed to free excitons (FXs), excitons bound to neutral donors, donor-acceptor pairs (DAPs), and first-order longitudinal optical phonon replicas of DAPs (DAPs-1LO), respectively. The energy interval between DAPs and DAPs-1LO was almost the same as the longitudinal optical (LO) phonon energy of bulk ZnO of ~76 meV. The PL spectra in the temperature range from 12 to 300 K shifted to lower energy with an increasing temperature. The activation energy of FX was estimated to be 61 meV. This value is similar to the exciton binding energy of 60 meV. (Received September 4, 2015; Accepted December 11, 2015)
K-doping effects on the characteristics of ZnO thin films synthesized by using a spin-coating method
Ji, Iksoo,Kim, Younggyu,Leem, Jae-Young,Park, Hyunggil,Kim, Soaram,Kim, Jong Su,Kim, Jin Soo Korean Physical Society 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10
Zinc-oxide (ZnO) thin films doped with various amounts of potassium were synthesized on quartz substrates by using the sol-gel method. The effects of K-doping on the structural and optical properties of the resultant ZnO thin films were investigated using X-ray diffraction (XRD), Ultravioletvisible (UV) spectroscopy, and photoluminescence (PL) spectroscopy. From the XRD results, the full width at half maximum (FWHM) for ZnO (002) and the grain size was measured. In the transmittance spectra, all the K-doped ZnO thin films were found to exhibit a high transmittance in the visible region. The optical band gap of the thin films was also determined from the transmittance results. The PL spectra showed near-band-edge (NBE) emission peaks in the UV region and deep-level emission (DLE) peaks of around 640 nm. The PL peak intensities of both the NBE emission and the DLE were found to change with varying concentrations of K.
Inferential evidentiality, distance, and embodiment
( Iksoo Kwon ),( Ji Hyon Kim ) 한국외국어대학교 언어연구소 2016 언어와 언어학 Vol.0 No.73
This paper aims to show that the use of grammatical forms is cognitively motivated by our ability to simulate actions (Barsalou 2009), by exploring the inferential evidentiality -napo- construction in Korean. Two simulation experiments manipulating evidential framing showed that the distancing effect (Dancygier and Sweetser 2005) is cognitively real. When participants were asked to give estimate ratings predicting the visible results of a depicted event, more salient results of an event were predicted when encoded in an evidentially neutral framing, compared to stimuli with the -napo- construction. In a follow-up experiment participants were asked to predict the distance between the speaker and the stimulus in sentences describing sensory perception differing in evidentiality Participants rated the distance between the speaker and the stimulus significantly higher for the stimuli with -napo-. These results support our claim that the priming of conceptual distance in construing linguistic evidentiality marking affects people`s simulation of measuring physical distance.
Induction of Apoptosis in Chicken Oviduct Cells by C2-Ceramide
김성학,김상훈,Ji Young Choi,Choon-Ryoul Sihn,서은정,Sun Young Kim,최강덕,Iksoo Jeon,한재용,김태윤 한국분자세포생물학회 2005 Molecules and cells Vol.19 No.2
The chicken oviduct is a dynamic organ that produces secretory proteins such as ovalbumin and its cells undergo cell proliferation and differentiation. There has been no study of the cellular mechanism involved in cell death in the chicken oviduct. Therefore, this study has focused on the study of apoptosis in primary oviduct cells. Because ceramide is known to activate apoptosis in tumor cells and is produced in the oviduct, we used an exogenous ceramide analog to induce cell death. The viability of ceramide-treated chicken oviduct cells decreased in a dose-dependent manner and apoptotic cells were detected by staining with annexin V. The expression of apoptosis-related genes was assessed by RT-PCR and bcl-2 mRNA was found to decrease after exposure to ceramide while Bcl-x mRNA increased 12 h post-treatment. In addition, caspase-3 was expressed strongly in the early stages of apoptosis,while caspase-1 and -9 transcripts increased at later times. We conclude that ceramide induces apoptosis in oviduct-derived primary cells via a caspase- and bcl-2-dependent pathway.
Nam, Giwoong,Park, Youngbin,Ji, Iksoo,Kim, Byunggu,Lee, Sang-heon,Kim, Do Yeob,Kim, Soaram,Kim, Sung-O,Leem, Jae-Young American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.1
<P>In this study, we report a novel regrowth method of sol–gel-prepared ZnO films using a vapor-confined face-to-face annealing (VC-FTFA) technique in which mica was inserted between two films, followed by annealing with the FTFA method. The ZnO nanorods are regrown when zinc acetate dihydrate and zinc chloride (ZnCl<SUB>2</SUB>) are used as the solvent, because these generate ZnCl<SUB>2</SUB> vapor. The near-band-edge emission intensity of the ZnO nanorods was enhanced through the VC-FTFA method, increasing significantly by a factor of 56 compared to that of ZnO films annealed in open air at 700 °C. Our method may provide a route toward the facile fabrication of ZnO nanorods.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-1/am507439e/production/images/medium/am-2014-07439e_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am507439e'>ACS Electronic Supporting Info</A></P>
Induction of apoptosis in chicken oviduct cells by C2-ceramide.
Kim, Sung Hak,Choi, Ji Young,Sihn, Choon-Ryoul,Suh, Eun Jung,Kim, Sun Young,Choi, Kang Duk,Jeon, Iksoo,Han, Jae Yong,Kim, Tae-Yoon,Kim, Sang Hoon Korean Society for Molecular Biology 2005 Molecules and cells Vol.19 No.2
<P>The chicken oviduct is a dynamic organ that produces secretory proteins such as ovalbumin and its cells undergo cell proliferation and differentiation. There has been no study of the cellular mechanism involved in cell death in the chicken oviduct. Therefore, this study has focused on the study of apoptosis in primary oviduct cells. Because ceramide is known to activate apoptosis in tumor cells and is produced in the oviduct, we used an exogenous ceramide analog to induce cell death. The viability of ceramide-treated chicken oviduct cells decreased in a dose-dependent manner and apoptotic cells were detected by staining with annexin V. The expression of apoptosis-related genes was assessed by RT-PCR and bcl-2 mRNA was found to decrease after exposure to ceramide while Bcl-x mRNA increased 12 h post-treatment. In addition, caspase-3 was expressed strongly in the early stages of apoptosis, while caspase-1 and -9 transcripts increased at later times. We conclude that ceramide induces apoptosis in oviduct-derived primary cells via a caspase- and bcl-2- dependent pathway.</P>