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Pohang, South Korea

Wang M.,Hanzhong University
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

A test system of valve class products based on industrial personal computer is developed. This test system is used for manufactories and quality supervisory departments to do the test of valve class products performance. Based on the control system of IPC and configuration software, the problem of collecting and storing performance parameters of valve class products with high speed was solved. This system uses data acquisition card and programmable logic controller to test the performances of valve class products, and the curves of the performances are described. With the alteration for high pressure manual regulator valve which be used in system, auto-regulation of valve opening was carried out. This data acquisition system has been used in a project of performance parameter testing of military valve class products, the date picking rate can reach 20 times/s and the measuring precision can reach 0.4%. © 2011 IEEE. Source


Lee H.S.,Hanzhong University | Lim S.S.,University of New South Wales | Park D.W.,Kunsan National University
Journal of Coastal Research | Year: 2011

Anmok Beach, South Korea, is adjoining a road, and the sides of this beach have been eroded year by year by the wave changes due to coastal construction. A terrestrial laser scanner and a raster data operation were utilized to implement a shore-surface model and classify the changed areas that eroded in an approximately 500-m shore section between September 3, 2010 and November 12, 2010. The point clouds data of the shore area were acquired at intervals of two months by terrestrial laser scanning. Two shore models were created more realistically by texturing a scanned digital photo mosaic on the surface model of a triangulated irregular network (TIN). In addition, we estimated the regional changes and volume differences in the erosion and accretion between the two shores using the raster operation. The results have shown that a volume of 13,101.99 m 3 was eroded and a volume of 7,204.96 m 3 was accreted. This study suggests that the use of the terrestrial laser scanner is expected to ensure the acquisition of good-quality results and help deal with seasonal changes in the beach areas. This method can be used as a real-time monitoring technique to measure the movement and the detection of a shore model along the coastline. Source


Kim J.,Korea Institute of Science and Technology | Kim S.H.,Korea Institute of Science and Technology | Lee D.-S.,Hanzhong University | Lee D.-S.,Well Being LS Co. | And 4 more authors.
Journal of Ginseng Research | Year: 2013

This study examined the effect of fermented ginseng (FG) on memory impairment and β-amyloid (Aβ) reduction in models of Alzheimer's disease (AD) in vitro and in vivo. FG extract was prepared by steaming and fermenting ginseng. In vitro assessment measured soluble Aβ42 levels in HeLa cells, which stably express the Swedish mutant form of amyloid precursor protein. After 8 h incubation with the FG extract, the level of soluble Aβ42 was reduced. For behavioral assessments, the passive avoidance test was used for the scopolamine-injected ICR mouse model, and the Morris water maze was used for a transgenic (TG) mouse model, which exhibits impaired memory function and increased Aβ42 level in the brain. FG extract was treated for 2 wk or 4 mo on ICR and TG mice, respectively. FG extract treatment resulted in a significant recovery of memory function in both animal models. Brain soluble Aβ42 levels measured from the cerebral cortex of TG mice were significantly reduced by the FG extract treatment. These findings suggest that FG extract can protect the brain from increased levels of Aβ42 protein, which results in enhanced behavioral memory function, thus, suggesting that FG extract may be an effective preventive or treatment for AD. © The Korean Society of Ginseng. Source


Byun J.-K.,Korea University | Jeong D.-H.,KEPCO Engineering and Construction Company Inc. | Choi Y.-D.,Korea University | Shin J.-K.,Hanzhong University
Energies | Year: 2013

In the present study, a fuel cell driven ground source heat pump (GSHP) system is applied in a community building and heat pump system performance is analyzed by computational methods. Conduction heat transfer between the brine pipe and ground is analyzed by TEACH code in order to predict the performance of the heat pump system. The predicted coefficient of performance (COP) of the heat pump system and the energy cost were compared with the variation of the location of the objective building, the water saturation rate of the soil, and the driven powers of the heat pump system. Compared to the late-night electricity driven system, a significant reduction of energy cost can be accomplished by employing the fuel cell driven heat pump system. This is due to the low cost of electricity production of the fuel cell system and to the application of the recovered waste heat generated during the electricity production process to the heating of the community building. © 2013 by the authors. Source


Lee H.,Hanzhong University | Lim S.,University of New South Wales | Paik H.,University of New South Wales
Journal of Spatial Science | Year: 2010

Although forest fires are commonly accepted as a natural part of the ecosystem, frequent forest fires present great challenges to fire managers. In this research, 'Fire Area Simulator' has been used to simulate and study forest fire behaviour. Once the predicted perimeters were generated and compared to those shown in postmortem aerial infrared images, partial agreement was observed for the direction and extent of the forest fire. Using spatial analysis functions, the characteristics of the damaged areas were also observed. It is shown that constructing fuel models and collecting weather data with regard to local and regional forest fires can improve the simulation of forest fires. The spatial modelling of landscapes in aerial infrared images can be used for the evaluation of the extent of damage due to forest fires. © 2010 Surveying and Spatial Sciences Institute and Mapping Sciences Institute, Australia. Source

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