Busan, South Korea
Busan, South Korea

Dong-eui University is one of the leading private university in Busan, a metropolitan city on the southeastern coast of South Korea. The University has 10 colleges, 116 master and doctoral courses in six graduate schools, with 22,992 students and 1,690 faculty and staff members. Dong-eui has gained fame in the fields of oriental medicine and engineering and has built solid reputations in other fields such as management, health science, nursing, and a range of science. Wikipedia.


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It has been understood that glycosidic forms of flavonoids were hydrolyzed by gut bacteria and absorbed as aglycones. However, several reports suggested that glycosides were partly absorbed without hydrolysis and remained biologically active. In this study, we evaluated the antioxidative potential of luteolin and luteolin-7-O-glucoside, glycosidic form of luteolin, against the oxidative damage and compared their antioxidative mechanisms in RAW 264.7 cells. Heme oxygenase-1 (HO-1), one of the phase II enzymes showing an antioxidative activity, was potently induced by luteolin and luteolin-7-O-glucoside treatment, which was in accordance with the translocated nuclear factor-erythroid 2 p45-related factor 2 (Nrf2) into nucleus. Moreover, luteolin and the luteolin-7-O-glucoside activated HO-1 expression by p38 and c-Jun NH2-terminal kinase (JNK) regulation. In order to identify the antioxidation potential by HO-1, tert-butyl hydroperoxide (t-BHP)-induced oxidative damage was applied and ameliorated by luteolin and the luteolin-7-O-glucoside treatment in a dose dependent manner, which was confirmed by HO-1 selective inhibitor and inducer, tin protoporphyrin (SnPP) and cobalt protoporphyrin (CoPP), respectively. Consequently, luteolin and luteolin-7-O-glucoside potently strengthen the HO-1-mediated antioxidative potential through the modulation of the Nrf2/MAPK signaling pathways. © 2013 Elsevier Ltd.


Patent
Samsung and Dong - Eui University | Date: 2015-06-10

A semi-permeable membrane may include a support layer and an active layer in contact with the support layer. The support layer includes a porous structure including a polymer and at least one metal (or metalloid) oxide in the porous structure. In the support layer, the amount of the metal (or metalloid) oxide present in a portion adjacent to the active layer is higher than the amount of the metal (or metalloid) oxide present in a portion farther from the active layer.


Patent
Dong - Eui University, Electronics and Telecommunications Research Institute | Date: 2012-06-26

A synchronization apparatus and method for synchronizing playback time of a media provided to multiple devices during service transfer and replication process are provided. The content synchronization system for providing a receiving terminal with content of a sending terminal, the content synchronization system includes the sending terminal; the receiving terminal; and a server configured to provide content to the sending terminal and the receiving terminal and to comprise a communication unit configured to communicate the sending terminal and the receiving terminal and to transmit a message and information about time point at which the message is sent, and a content playback time point calculating unit configured to calculate a first content playback start time point of the receiving terminal in an effort to provide the content of the sending terminal that is synchronized with the receiving terminal.


Tetrapod-shaped ZnO crystals were synthesized by an oxidation process of Zn powder at temperatures over 930 °C in air. The ZnO crystals were formed in an alumina crucible in which metallic Zn powder was put. X-ray diffraction patterns revealed that the tetrapods were ZnO with wurtzite structure. Any impurities including Zn were not detected, indicating that the ZnO crystals were of high quality. As the oxidation temperature increased, the size of tetrapods was getting larger and longer. However at 1100 °C, tetrapod morphology was disappeared and changed to irregular shape. Strong UV emission at 380 nm was observed in the CL spectra taken for the ZnO tetrapods. The increase in the intensity of green emission at 510 nm was also observed with increased oxidation temperature. © 2010 Elsevier Ltd and Techna Group S.r.l.


Han C.-W.,Dong - Eui University
Applied Mathematics and Information Sciences | Year: 2014

In networked control systems, the varying transmission time delay of the transmitting signal is unavoidable. If the varying transmission time delay exceeds the fixed sampling time, the system will be unstable. To solve this problem, in this paper, the logicbased fuzzy neural networks are applied to the prediction of transmission time delay. The predicted time delay is used as a sampling period of the networked control systems. To show the usability of the proposed method, the transmission time delay data are collected from the real system, and these collected data are used to train and test the logic-based fuzzy neural networks. © 2014 NSP Natural Sciences Publishing Cor.


Ga-doped ZnO(GZO) thin films were deposited on the quartz substrate by magnetron sputtering system with growth interruption technique. As the number of interruptions and interruption time increased, the carrier concentration and Hall mobility in GZO films significantly increased. As a result, the resistivity of GZO films decreased. The optical transmittance of GZO films also increased with the number of interruption and interruption time. The transmittance showed over 90% in visual region. Atomic force microscopy measurement showed that the film surface became smoother with an increase of the number of interruption. In addition, the crystalline quality and electrical properties of GZO films were more improved when the growth interruption was employed with a temperature gradient. © 2013 Elsevier B.V.


Lee G.-H.,Dong - Eui University
Ceramics International | Year: 2014

SnO2 nanowires were synthesized by an unique thermal evaporation technique employing solar energy at atmospheric pressure in air. Sunlight was used to create heat, which is referred herein to as solar thermal energy, a clean form of energy. The sunlight was focused onto a small area containing the tin (Sn) powder by using a magnifying lens. The concentrated sunlight created sufficient heat to melt and vaporize the Sn powder. Furthermore, the Sn vapor was made to react with oxygen in air to form tin oxide (SnO2) product. The product was confirmed to consist of high purity SnO2 nanowires. The SnO2 nanowires was obtained within just several seconds by the solar thermal evaporation technique. The SnO2 nanowires were about several tens of nanometers in diameter and a few tens of micrometers in length. The ultraviolet (UV) emission at 355 nm as well as a visible emission at around 580 nm was observed in the room temperature cathodoluminescence (CL) spectrum, which confirms the high quality of the SnO2 nanowires. These results establish a novel rapid synthesis process for the formation of SnO2 nanowires. © 2014 Elsevier Ltd and Techna Group S.r.l.


Patent
Hyundai Motor Company and Dong - Eui University | Date: 2014-08-05

A spot welding method for a high strength steel sheet is provided. The method includes a first pulse step for applying electric current of about 8 to 9 kA about 1 to 3 cy and a first cooling step for cooling for about 1 to 3 cy. In addition, the method includes a second pulse step for applying electric current less than the electric current applied in the first pulse step and a second cooling step for cooling for about 1 to 3 cy. A third pulse step includes applying electric current greater than the electric current applied in the second pulse step.


Lee G.-H.,Dong - Eui University
Materials Letters | Year: 2012

ZnO nanowires with pencil shape were synthesized in several seconds through a simple thermal evaporation of ZnS powder using sunlight under air atmosphere. ZnS powder was used as a source material. Light from the sun was used to heat and evaporate the ZnS powder. The sunlight was converged on the ZnS powder by a fresnel lens, and then the ZnS powder was evaporated and oxidized in air. ZnO nanowires with a diameter of about 100 nm and lengths up to several micrometers were fabricated. Any catalysts were not used in the synthesis of ZnO nanowires, from which it is suggested that the ZnO nanowires were grown by a simple evaporation-condensation mechanism. This synthetic method using sunlight must be a green technique with low energy consumption and without any environmental pollution. © 2011 Elsevier B.V. All rights reserved.


Tetrapod-shaped ZnO nanocrystals were synthezised via thermal evaporation of Zn powder in air. The Zn powder was oxidized at 930 °C for 60 min. To investigate the optimal Zn/O molar ratio in such vapor phase synthesis, the Zn content was varied in range of 0.1-0.75 g. When the Zn content was 0.1 g, no nanocrystals were formed. Above 0.25 g Zn, growth of ZnO nanocrystals started without clear tetrapod like morphology. Beyond Zn content of 0.50 g, clear tetrapod-shaped ZnO nanocrystals were detected. These results establish that there is a certain required ratio of zinc and oxygen in vapor phase for generation of tetrapod-shaped ZnO nanocrystals. Such Zn:O ratio is also calculated theoretically from the ideal gas law. Clear tetrapod type ZnO nanocrystals prepared with Zn content of 0.5 g exhibited the highest intensity of the ultraviolet emission centered at 380 nm which also confirms the high crystalline quality of such ZnO nanocrystals. © 2012 Elsevier B.V.

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