Kazuyuki Izuno

Vibration reproduction for a virtual Yamahoko Parade system

We tried to build a virtual Yamahoko Parade experiencing system as a digital museum research for Kyoto Gion Festival. We collected route data and acceleration data of Hayashibutai, the performance stage of the Yamahoko float, with a GPS logger and acceleration sensors during the parade. We adopted the data to reproduce the vibration using a vibration platform and integrated vibration, sound, and 3D screen to build an experimental system. The analysis of the reproduced acceleration data and the original acceleration data showed that the virtual experiencing system reproduced the vibration of the Hayashibutai. We also received positive feedbacks from the experts participated in our experiment.

Virtual Yamahoko parade with vibration

With the development of computer graphics and virtual reality technologies, extensive researches have been carried out on digital archiving of cultural properties. For decades, tangible cultural heritage contents including historical crafts, archaeological sites, and historical buildings have been digitally archived. Recently, digital archiving of intangible culture heritage contents, such as traditional festivals and behaviors of participants in cultural events have attracted more and more attention. Yamahoko Parade of Gion Festival, one of the most famous festivals in Japan, becomes a symbolic landscape in Kyoto. During the festival, 32 floats (yama and hoko) representing each local neighborhood parade in the city center. We conduct researches to restore and represent this exciting event, full of Kyotos tangible and intangible culture and tradition, with cutting-edge technologies such as laser scanning, CG modeling, motion capture system, 4D-GIS, high fidelity sound recording, and vibration system.

4 – Corrosion-induced cracks in concrete and hybrid non-destructive evaluation (NDE) for evaluation in rebar corrosion

The mechanisms of corrosion-induced cracks and evaluation methods for diagnosis are under development in concrete engineering. In order to develop acoustic emission (AE) techniques to be applicable to on-site measurement for infrastructure, hybrid-nondestructive evaluation (NDE) is under investigation. In this chapter, an accelerated corrosion test of reinforced concrete (RC) specimens was introduced. To monitor the corrosion process, AE measurement was applied, along with measuring half-cell potentials and polarization resistances at the surface of the RC specimen. Here, in order to identify the corroded area in rebar, the potential inverse BEM (PiBEM) analysis was developed and applied. Toward practical on-site measurement using NDE, damage identification of rebar corrosion due to salt attack was demonstrated.