Andong, South Korea
Andong, South Korea

Andong National University is a government-operated university in Andong City, North Gyeongsang province, South Korea. It enrolls roughly 6500 students. It contains undergraduate colleges of Humanities, Social science, Education, Natural science, Engineering, Human Ecology, and Arts and Physical Education, as well as graduate schools of Education, Management, and General Studies. The undergraduate students of March 2006 numbered 10,274, representing a steady upward trend in recent years, according to the school website . Wikipedia.

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Andong National University and 4DCULTURE United States LLC. | Date: 2015-01-07

The present invention relates to a system and a method for acquiring a color image from a monochrome scan camera, and the system comprising: a projector for projecting an RGB color light source; a camera for photographing an object on which the RGB color light source is to be projected; and a color reproduction unit for acquiring a color image by normalizing the light intensity of the RGB color light source and adjusting a gain for each RGB channel using gain adjustment coefficients generated by calculating tristimulus values of the camera, and thus the present invention obtains an effect of reproducing 3D information and color information of an object by projecting the RGB color light source of the projector to acquire a plurality of images from the same scene and ascertaining the color information of the object inputted into the camera from the plurality of images.

Stanley D.,U.S. Department of Agriculture | Kim Y.,Andong National University
Critical Reviews in Plant Sciences | Year: 2014

Prostaglandins (PGs) and related eicosanoids are signal moieties derived from arachidonic acid and two other C20 polyunsaturated fatty acids. They were discovered in the 1930s in the context of mammalian reproductive physiology; PGs were associated with the prostate gland, hence their name, and they stimulate uterine smooth muscle contraction. Determining PG chemical structures in the early 1960s and demonstrating that they mediate many human pathophysiological events in the 1970s stimulated intensive research over the following decades in universities, governments and the private sector. Interest in the biological significance of PGs in insects arose in the 1970s and 1980s, which opened a new research frontier. PGs act in reproduction, releasing egg-laying behaviors in some species and signaling egg-maturation events in the Drosophila and silk moth models. They act in insect immunity, mediating and coordinating cellular and humoral responses to wounds, infection and invasion. PGs act in ion transport physiology in insect Malpighian tubules and recta. These compounds also mediate physiological trade-offs between insect immunity and reproduction. Finally, they are central players in the molecular ecology of interactions between blood-feeding insects and their vertebrate hosts. Some PG functions are critical at specific, crucial moments in insect lives, moments we consider 'emergencies,' such as the immediate reactions to infection. Certain microbial species have keyed into insect PG signaling and they evolved mechanisms to disable insect immune reactions to infection by inhibiting key enzymes in PG biosynthesis. We provide proof-of-principle that RNA interference treatments designed to silence genes in PG signaling disrupts insect immunity. In this review we describe the history, chemistry and biology of PGs. We use this background to argue that because PGs and other eicosanoids act in emergency situations, they are visible targets for development and deployment of novel insect pest management technologies. © 2014 Copyright Taylor and Francis Group, LLC.

Andong National University and Sejong Industrial Co. | Date: 2012-08-22

The present invention provides an electrochemical biosensor electrode structure that includes: a working electrode and a reference electrode used as electrodes for sample measurement being arranged separately from each other in lengthwise direction of a sample insertion path, the working electrode and the reference electrode each having at least one projection and at least one recess alternately arranged on a portion thereof corresponding to the sample insertion path, the projection of the working electrode being correspondingly adjacent to the recess of the reference electrode, the recess of the working electrode being correspondingly adjacent to the projection of the reference electrode; and at least two sample recognition electrodes used as electrodes for sample recognition being separated from each other and arranged adjacent and parallel to the working electrode and the reference electrode. There is also described a method for fabricating an electrochemical biosensor electrode. The present invention minimizes the effect of the double layer capacitance and independently applies the sample recognition signal to accurately detect the sample insert time and velocity.

BACKGROUND: Ginger leaf (GL) has long been used as a vegetable, tea and herbal medicine. However, its pharmacological properties are still poorly understood. Thus, we performed in vitro studies to evaluate anti-cancer properties of ginger leaf and then elucidate the potential mechanisms involved.METHODS: Cell viability was measured by MTT assay. ATF3 expression level was evaluated by Western blot or RT-PCR and ATF3 transcriptional activity was determined using a dual-luciferase assay kit after the transfection of ATF3 promoter constructs. In addition, ATF3-dependent apoptosis was evaluated by Western blot after ATF3 knockdown using ATF3 siRNA.RESULTS: Exposure of GL to human colorectal cancer cells (HCT116, SW480 and LoVo cells) reduced the cell viability and induced apoptosis in a dose-dependent manner. In addition, GL reduced cell viability in MCF-7, MDA-MB-231 and HepG-2 cells. ATF3 knockdown attenuated GL-mediated apoptosis. GL increased activating transcription factor 3 (ATF3) expressions in both protein and mRNA level and activated ATF3 promoter activity, indicating transcriptional activation of ATF3 gene by GL. In addition, our data showed that GL-responsible sites might be between -318 and -85 region of the ATF3 promoter. We also observed that ERK1/2 inhibition by PD98059 attenuated GL-mediated ATF3 expression but not p38 inhibition by SB203580, indicating ERK1/2 pathway implicated in GL-induced ATF3 activation.CONCLUSIONS: These findings suggest that the reduction of cell viability and apoptosis by GL may be a result of ATF3 promoter activation and subsequent increase of ATF3 expression through ERK1/2 activation in human colorectal cancer cells.

In this paper, we examine an efficient calculation of the approximate frequency response (FR) for large-size finite element (FE) models using the Krylov subspace-based model order reduction (MOR) and its direct design sensitivity analysis with respect to design variables for sizing. Information about both the FR and its design sensitivity is necessary for typical gradient-based optimization iterations; therefore, the problem of high computational cost may occur when FRs of a large-size FE models are involved in the optimization problem. In the method suggested in this paper, reduced order models, generated from the original full-order FE models through the Arnoldi process, are used to calculate both the FR and FR sensitivity. This maximizes the speed of numerical computation of the FR and its design sensitivity. Assuming that the Krylov basis vectors remain constant with respect to the perturbation of a design variable, the FR sensitivity analysis is performed in a more efficient manner. As numerical examples, a car body with 535,992 degrees of freedom (DOF) and a 6 × 6 micro-resonator array with 368,424 DOF are adopted to demonstrate the numerical accuracy and efficiency of the suggested approach. Using the reduced-order models, we found that the FR and FR sensitivity are in a good agreement with those using the fullorder FE model. The reduction in computation time is also found to be significant because of the use of Krylov subspace-based reduced models. © 2012 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.

Hwang H.Y.,Andong National University
Journal of Composite Materials | Year: 2011

Several researches on nondestructive damage monitoring of composite materials by piezoelectric method had been conducted recently, and concluded that the piezoelectric method can be useful for glass fiber epoxy composites. However, few studies were performed about piezoelectric properties of composites despite the importance for analyses of the electro-mechanical coupling systems. Therefore, in this study, the effect of strain rate on the piezoelectric characteristics of unidirectional glass fiber epoxy composites (UGFEC) was investigated. Under various strain rates, stress-strain curve and charge output signal from composite specimens were obtained by experiments. From experimental results, through-thickness modulus increased but electric charge output decreased linearly by increasing the strain in log scale. And piezoelectric strain constant of UGFEC was almost same while piezoelectric stress constant decreased with respect to the strain rate. From the results, it was concluded that electric charge output of UGFEC is influenced by the strain itself rather than by the strain rate. © The Author(s) 2010.

Lee S.H.,Andong National University
Review of Scientific Instruments | Year: 2012

This paper presents the methodology to measure the precise deflection of microcantilever in an optical pickup head based atomic force microscopy. In this paper, three types of calibration methods have been proposed: full linearization, sectioned linearization, and the method based on astigmatism. In addition, the probe heads for easy calibration of optical pickup head and fast replacement of optical pickup head have been developed. The performances of each method have been compared through a set of experiments and constant height mode operation which was not possible in the optical pickup head based atomic force microscopy has been carried out successfully. © 2012 American Institute of Physics.

Seo T.,Andong National University
Korea Australia Rheology Journal | Year: 2013

In the study, two different arterial bifurcation model geometries were used in the flow simulation. The model 1 is assumed the internal carotid artery (ICA) and the external carotid artery (ECA) branches of the bifurcation aligned in parallel to each other, while the model 2 is the typical carotid geometry. In the computation the Non-Newtonian behavior of blood was described using Carreau model. Generally, in the comparison between Newtonian and Non-Newtonian results good agreement was observed in the velocity profiles, while some discrepancies were found in the temporal wall shear stress (WSS) distributions as well as pressure profiles due to the shear thinning behavior. The temporal evolution of WSS periodically increases and decreases closely that of the inlet velocity waveform. It was also observed that the reversed flow region in the ICA of model 2 is 2.5 times larger than that of model 1. As a result, the variation of the flow characteristics can be dependent on the geometry as well as the arterial bifurcation geometry plays an important role in the development of atherosclerosis. © 2013 The Korean Society of Rheology and Springer.

Kang M.-G.,Andong National University
International Journal of Heat and Mass Transfer | Year: 2010

An experimental study was carried out to investigate the pool boiling heat transfer in an inclined annular tube submerged in a pool of saturated water at atmospheric pressure. The outer diameter and the length of the heated inner tube were 25.4 mm and 500 mm, respectively. The gap size of the annulus was 15 mm. For the tests, annuli with both open and closed bottoms were considered. The inclination angle was varied from the horizontal position to the vertical position. At a given heat flux, the heat transfer coefficient was increased with the inclination angle increase. Effects of the inclination angle on heat transfer were more clearly observed in the annulus with open bottoms. The main cause for the tendencies was considered as the difference in the intensity of liquid agitation and bubble coalescence due to the enclosure by the outer tube. One of the important factors in the annulus with open bottom was the convective fluid flow. © 2010 Elsevier Ltd. All rights reserved.

Hwang H.Y.,Andong National University
Composites Science and Technology | Year: 2012

A new nondestructive method using the piezoelectric characteristics of polymer matrix was suggested for the damage monitoring of glass fiber polymer composites, and the feasibility of the use of the method was proven through basic experiments. Heretofore, most studies have focused on basic material properties such as the piezoelectric properties of unidirectional glass fiber epoxy composites with respect to the fiber orientation or the loading speed. In this study, the effect of the crack length on the piezoelectric damage monitoring of glass fiber polymer composites was experimentally investigated. Dynamic tests of mode I were performed using double-cantilever-beam (DCB) specimens, and the relationship between the crack length and the electric-charge signals measured from the electrodes on the DCB specimens was analyzed. The experiment results showed that the magnitude of the electric-charge signals increased very slowly as the crack tip approached the electrodes, rose sharply when the crack tip was passing through the electrodes, and then decreased fast and maintained relatively very low values when the crack tip had completely passed through the electrodes. The investigation of the mechanical behaviors via finite-element analyses during the dynamic tests revealed that the tendency of electric-charge signals is quite similar to that of the strain changes in glass fiber epoxy composites near electrodes. Based on the results of the experiments and finite-element analyses conducted in this study, it was concluded that piezoelectric damage monitoring can detect crack propagation. © 2012 Elsevier Ltd.

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