International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Japanese has various kinds of fillers. Their functions include not only hesitation but also marking the softening of utterances and indicating breaks between utterances. This study analyzes native Japanese, Chinese, Korean and Vietnamese speaker brain’s cerebral blood flow related to fillers by using fNIRS (functional near-infrared spectroscopy). Additionally, we seek to explore the relationship between fillers and politeness of utterances by analyzing the sounds of fillers. We conclude fillers are connected to the increase of cerebral blood flow and filler’s kinds, pitch, length and strength are influenced to politeness.

In this study, graphene oxide (GO) was synthesized from graphite by using the Hummer method. GO was reduced using hydrazine hydrate to achieve reduced graphene oxide (RGO). GO and RGO powders synthesized by these methods can be used as fillers in the production of polymer matrix composite. These synthesized powders was examined in detail using the Zeta Potential (ZP) measurements, Ultraviolet Visible Spectrophotometer (UV-VIS), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) equipped with Energy Dispersive Spectroscopy (EDS) analyzer and Thermogravimetric-Differential Thermal Analysis (TG-DTA). All analysis results confirmed the GO and RGO considered as fillers in the production of polymer matrix composite can be prepared successfully.