Kyung Sung

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Background/Aims: Gastric atrophy can be diagnosed by serum pesinogen I/II ratio. The aim of this study was to investigate whether the changes of serum pepsinogen I/II ratio can be predicted by gastroscopy. Materials and Methods: Sixty healthy subjects who underwent screening for serum pepsinogen I/II levels, serum Helicobacter pylori (H. pylori) antibody,(More)
A matrix converter is a three phase AC-to-AC direct converter without any energy storage requirement such as DC link capacitors. In this paper, a new control method for the matrix converter based on direct conversion approach to realize both the instantaneous output current control and reduction of the input current harmonics is proposed. The proposed(More)
Gains promised by the introduction of e-commerce back-office systems are not easily realized due to poor technology acceptance, especially in developing countries. This study aims to analyze factors which affect information technology acceptance in developing countries. A research model based on TAM is proposed, and it is empirically tested for the(More)
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