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Effect of copper oxide on the resistive switching responses of graphene oxide film
Yoo, D.H.,Cuong, T.V.,Hahn, S.H. Elsevier 2014 Current Applied Physics Vol.14 No.9
The role of CuO films in meliorating resistive switching behavior of graphene oxide (GO) in CuO/GO/CuO memory structure was investigated. An increase in the set voltage from 1.3 to 3.0 V and a step-like switching current was clearly observed when the GO film was sandwiched between two CuO layers. It is attributed to the fact that the set voltage of GO is lower than that of CuO and accumulated charge carriers located at the interface of GO and CuO can pass through CuO abruptly at set voltage of 3.0 V. Our results suggested that designed sandwich structure of materials with different set voltage enables to amend resistive switching response characteristics.
Hong, Do-Young,Jhung, Sung Hwa,Vislovskiy, V. P.,Chang, Jong-San,Yoo, Jin S.,Park, Sang-Eon,Park, Yeung-Ho 한국공업화학회 2004 응용화학 Vol.8 No.2
Over V-Sb-O/Al₂O₃ catalyst, substantially higher (~ 20 - 60% in relative) conversions of initial hydrocarbons and yields of corresponding alkenylbenzenes have been achieved under the dehydrogenation of ethylbenzene, iso- and n-propylbenzenes, 1,4-diethylbenzene and 4-ethyltoluene in the presence of carbon dioxide, compared to those in inert atmosphere, due to promotional oxidative functions of CO₂ to alleviate the dehydrogenation equilibrium as well as to maintain V-sites in active oxidation state, V^(5+).
Yoo, S.-Y.,Le, T.K.V.,Jeong, J.J.,Kim, D.-H. PHARMACEUTICAL SOCIETY OF JAPAN 2014 Chemical & pharmaceutical bulletin Vol.62 No.5
The rhizome of Polygala tenuifolia WILLD (PT, family Polygalaceae) has been used in traditional Chinese medicine for inflammation, dementia, amnesia, neurasthenia and cancer. The phosphoinositide 3-kinase (PI3K)/Akt inhibitor(s) was isolated from PT by using the cytoprotective phenotype of human immunodeficiency virus type 1 (HIV-1) Tat-transduced CHME5 cells against lipopolysaccharide/cycloheximide. We isolated 9 constituents (1) (9) from ethyl acetate fraction of PT, which potently showed anti-cytoprotective effect against HIV-1 TAT-transduced cells. Of them, (9R)-(-)-9-peptandecanolide (2), a new compound named poligapolide, most potently abolished the cytoprotective effect of HIV-1 Tat-transduced CHME5 cells. The compound (2) inhibited the phosphorylation of Akt and its downstream molecule, glycogen synthase kinase-3 beta (GSK3 beta) in PI3K/Akt cell survival signaling pathway, but did not suppress the phosphorylation of PI3K and pyruvate dehydrogenase lipoamide kinase isozyme 1. Based on these finding, poligapolide may abolish the cytoprotective phenotype of HIV-1 Tat-transduced CHME5 cells by inhibiting Akt phosphorylation in PI3K/Akt pathway.
Ferromagnetism-to-Paramagnetism Transition in the ZnMnO System
V. S. Dang,Y. Y. Song,N. Q. Hoa,유성초,Y. G. Yoo 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The magnetic properties of Mn- and P-doped ZnO prepared by using the solid state reaction and pulsed laser deposition (PLD) were investigated by measuring the magnetization and the absorption derivative of the electron paramagnetic resonance (EPR). The film's thickness was about 0.3 μm. The X-ray diraction pattern indicated a single-phase polycrystalline ZnO structure without any MnO₂ phase in both the polycrystalline samples and the thin lms. The magnetic behaviors of the samples were determined by using an alternating gradient magnetometer (AGM) at room tempera- ture. All the bulk samples showed ferromagnetism at room temperature. Mn-doped ZnO films with Zn₃P₂ added also showed ferromagnetism at room temperature. A transition from ferromagnetism to paramagnetism with increasing in sintering temperature was detected in the EPR experiments. The absorption derivative of the EPR signal showed hyperne splitting for the samples sintered at 800 and 900℃ due to a spin degeneracy of Mn²+, the hyperfine splitting disappeared for the samples sintered at 1000℃ due to a superposition of the six lines of hyperfine splitting.
Yoo, D.H.,Cuong, T.V.,Pham, V.H.,Chung, J.S.,Khoa, N.T.,Kim, E.J.,Hahn, S.H. Elsevier 2011 Current Applied Physics Vol.11 No.3
Photocatalytic TiO<SUB>2</SUB> films were prepared using RF magnetron sputtering and three kinds of graphene oxide (GO) solutions with different concentration of 0.05 mg GO, 0.03 mg GO, and 0.01 mg GO in 10 ml ethanol were coated on TiO<SUB>2</SUB> films, respectively. Structures and morphologies of the samples were examined by AFM, SEM, and Raman and photocatalytic properties under UV and visible irradiation were examined respectively. The efficiency of the photodegradation is enhanced when TiO<SUB>2</SUB> thin film was coated with GO, it is related to its giant π-conjugation system and two-dimensional planar structure and efficient charge separation by coating GO. The maximum photodegradation rate was observed for TiO<SUB>2</SUB> thin film coated with 0.03 mg GO. It is attributed to the increase of absorbance and scattering of photons through excess carbon in the photosystem.
Bonghan Ducts as Possible Pathways for Cancer Metastasis
Yoo, J.S.,Kim, H.B.,Ogay, V.,Lee, B.C.,Ahn, S.,Soh, K.S. Elsevier 2009 Journal of Acupuncture & Meridian Studies Vol.2 No.2
Objective: The present study has been designed to find a possible new route for the metastasis of cancer cells on the fascia surrounding tumor tissue using a novel technique of trypan blue staining. Materials and Methods: Tumor tissues were grown in the skin of nude mice after sub-cutaneous inoculation with human lung cancer cells. Trypan blue was recently identified as a dye with specificity for Bonghan ducts (BHDs) and not other tissues, such as blood or lymph vessels or nerves. Results: We demonstrate that the trypan blue staining technique allows the first visualization of BHDs which are connected to tumor tissues. Conclusion: Since BHDs are known to make up a circulatory system corresponding to acu puncture meridians or collaterals, we propose that, in addition to the currently known blood or lymph vessels, BHDs on tumor tissue fascia may be a novel pathway for metastasis.
Chandrasekaran, S.,Kim, E.J.,Chung, J.S.,Yoo, I.K.,Senthilkumar, V.,Kim, Y.S.,Bowen, C.R.,Adamaki, V.,Hyun Hur, S. Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.309 No.-
This is the first demonstration of four distinct types of Lead Magnesium Titanate (PMT) perovskites including spheres, flakes, hierarchical flower and thin microbelt shapes that were finely tuned via facile solution method to develop cost effective and high performance photoanode materials for water splitting. The influence of solvent effects during structural tuning, purity, morphology, optical absorption, structural phase transition and stoichiometric formation of the prepared Lead Magnesium Titanate perovskites has been discussed in detail. A remarkable observation is that the thin microbelts structured PMT perovskite (PMTT) exhibited an excellent water splitting performance and it is more sensitive to the illuminated visible light. Owing to the unique structural features, the photoconversion efficiency value of PMTT perovskite is ~3.9, 3.54, 2.85 and 1.52 times higher than those of other prepared PMT perovskites including pristine PbTiO<SUB>3</SUB>. The excellent water splitting performance of PMTT (thin microbelts) may be ascribed to the remarkable structural features that include a large surface area, high optical absorbance, more active sites and high interface area of the microbelts, which provide large contact areas between the electrolyte and highly active materials for electrolyte diffusion and a rapid route for charge transfer with minimal diffusion resistance. In addition, each thin microbelt is directly in contact with the Ni foam substrate, which can also shorten the diffusion path for the electrons. The demonstrated approach paves the way for low-cost and high-throughput production of next generation, high performance and highly active water splitting perovskite photocatalysts.
Shin, S.W.,Kim, I.Y.,Kishor, G.V.,Yoo, Y.Y.,Kim, Y.B.,Heo, J.Y.,Heo, G.S.,Patil, P.S.,Kim, J.H.,Lee, J.Y. Elsevier Sequoia 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.585 No.-
The transparent conductive and flexible Mg and Ga co-doped ZnO (MGZO) thin films were prepared on poly-ethylene telepthalate (PET) by the RF magnetron sputtering technique at room temperature. The effects of different thicknesses on the structural, chemical, morphological, optical and electrical properties of MGZO thin films were investigated. X-ray diffraction studies showed that MGZO thin films were grown as a polycrystalline hexagonal wurtzite phase without a secondary phase. The peak intensities for the (0002) plane of MGZO thin films were enhanced with increasing thickness. A typical survey spectrum of MGZO thin films confirmed the presence of Mg, Ga, Zn and O resulting from MGZO films regardless of thickness. The MGZO thin films had a larger grain size with increasing thickness. The MGZO thin films showed the widest optical band gap energy of 3.91eV (50nm) and lowest electrical resistivity of 5.76x10<SUP>-3</SUP>Ωcm (400nm).