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Distinction of loss and recovery of consciousness is an important component in consciousness study. To find transitions in and out unconsciousness, monitoring depth of anesthesia (DOA) should be reliably assessed. Previous studies have proposed several methods for measuring DOA, and one of the significant methods to identify between awaked and anesthetized state is global filed synchrony (GFS). GFS...
In accordance with the increase in importance of software within railway signaling system, risk costs due to the software error are increasing too. Accordingly, software validation in various aspects is required, and the needs for supporting tool which can automate it are raised. In Korea, the black-box testing tool of railway signaling system taking into consideration of the convenience of use which...
Using a phase-change memory (PCM) device composed of Ge2Sb2e5 (GST), we studied the mechanism of the SET-stuck failure (SSF), a constantly low-resistance state during write/erase (W/E) cycling. The SSF state was characterized with increased RESET current and decreased threshold voltage, which were thought to be due to depletion of Ge and enrichment of Sb inside the active volume of GST. Moreover,...
As the current use of computer-based control systems becomes common, the security of safety and reliability needed for systems turns to difficult. In particular, the railway signaling control system requires higher safety and reliability. Railway advanced countries, especially European countries, are performing studies and projects concerning formal methods. In Korea, however, the studies of formal...
Failures of equipments for train control systems are linked directly to extensive damages of human lives or financial losses from the increasing uses of train control equipments utilizing computers. Then safety activities for assuring safety and reliability are needed during the system life-cycle. Risk assessment is important phase to increase safety from determining the risk presented by the identified...
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