Byungrak Son

Highly Branched RuO2 Nanoneedles on Electrospun TiO2 Nanofibers as an Efficient Electrocatalytic Platform

Highly single-crystalline ruthenium dioxide (RuO2) nanoneedles were successfully grown on polycrystalline electrospun titanium dioxide (TiO2) nanofibers for the first time by a combination of thermal annealing and electrospinning from RuO2 and TiO2 precursors. Single-crystalline RuO2 nanoneedles with relatively small dimensions and a high density on electrospun TiO2 nanofibers are the key feature. The general electrochemical activities of RuO2 nanoneedles-TiO2 nanofibers and Ru(OH)3-TiO2 nanofibers toward the reduction of [Fe(CN)6](3-) were carefully examined by cyclic voltammetry carried out at various scan rates; the results indicated favorable charge-transfer kinetics of [Fe(CN)6](3-) reduction via a diffusion-controlled process. Additionally, a test of the analytical performance of the RuO2 nanoneedles-TiO2 nanofibers for the detection of a biologically important molecule, hydrogen peroxide (H2O2), indicated a high sensitivity (390.1 ± 14.9 μA mM(-1) cm(-2) for H2O2 oxidation and 53.8 ± 1.07 μA mM(-1) cm(-2) for the reduction), a low detection limit (1 μM), and a wide linear range (1-1000 μM), indicating H2O2 detection performance better than or comparable to that of other sensing systems.

Analysis of Cerebral Activation in Users Induced by Visual Stimulus Variation

This study presents the analysis of the changes in cerebral activation state induced by the visual stimuli delivered through the combination of colors, and derived significant results associated with the changes in cerebral activation state in relation to concentration index, psychological index, etc., based on the variation of stimulation. The results of this study may provide basis for building the efficient visual stimulating interfaces necessary for achieving the goals in various application in medical, educational fields, robotics, functional game sectors, and many more.

Command and data acquisition system for GAORI

This paper introduces a bio-inspired GAORI robot with renewable energy source and presents its command and data acquisition system for remote commanding as well as data forwarding/backup/relay. The hardware architecture design and software implementation of GAORI command and data acquisition system are presented in this paper.