Dae-Hwan Kang

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Fluctuations ͑or drifts͒ in switching voltages such as programming set/reset voltages and threshold voltage pose serious obstacles to the reliable operation of electrical phase change memory devices. Using a phase change memory device having a GeSb 2 Te 4 phase change material and TiN electrode, these fluctuations are demonstrated to result from device(More)
BACKGROUND Reflux esophagitis is inversely associated with the presence of atrophic gastritis, and endoscopic grading of atrophic gastritis correlates with histological evaluation. The aim of this study was to investigate the association of the endoscopic grade of atrophic gastritis with gastroesophageal and gastropharyngeal reflux. METHODS A total of 627(More)
Misoprostol is reported to prevent non-steroidal anti-inflammatory drug (NSAID)-associated gastroduodenal complications. There is, however, limited information regarding the efficacy of DA-9601 in this context. We performed a comparative study on the relative efficacy of DA-9601 and misoprostol for prevention of NSAID-associated complications. In this(More)
We emulate the spike-timing dependent plasticity (STDP) behavior of biological synapse in two phase change memory (2-PCM) cells with 3x nm technology, which has been considered as a formulated Hebbian learning rule of our cognition, learning and memory abilities. Various STDP behaviors are successfully realized in 2-PCM synapse by varying the interval of(More)
BACKGROUND/AIMS It has been recently reported that celiac ganglia can be identified by linear-array endoscopic ultrasonography (EUS). Still, there has been no report on the detection rate of celiac ganglia with radial scanning EUS. The aim of this study was to evaluate the detection rate of celiac ganglia by radial scanning echoendoscopy during a routine(More)
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