Abstract: Because securing sanitation was one of the great concerns after the Great East Japan earthquake of 2011, the writers developed a disaster-responsive portable toilet unit modeled after urine-diverting toilets. The unit, ...

Abstract: The seismic safety of city gas supply has been the major research topic of the writers in past decades. To avoid earthquake hazards due to leakage of gas from breakage of buried pipes, a real-time safety control system,