Shigeru Nagata

Earthquake damage estimation and decision analysis for emergency shut-off of city gas networks using fuzzy set theory☆

Abstract Earthquake damage estimation for lifelines can be used for many purposes, for example, planning repair works or simulating network recovery. For gas networks, however, the issue is more crucial, as secondary disasters due to leaks are possible. If necessary, the gas supply should be interrupted in heavily-damaged areas. Therefore, emergency shut-off decision is vital and earthquake damage estimation can be effectively used for a more reliable and swift decision-making. The system proposed in this paper uses fuzzy set theory to formalize knowledge acquired from experience and assess earthquake damage from ground conditions and ground motion characteristics. The results are obtained as fuzzy damage indices. Fuzzy decision analysis is then utilized to transform this imprecise information into a clear-cut decision on whether to cut or maintain the gas supply in a given area of the network.

ANALYSIS OF HUMAN BEHAVIOR DURING EVACUATION EXPERIMENT IN A MAZE

本研究では, 緊急時の人間行動に関する被験者実験と並行して行われたアンケート調査や性格検査の結果から, 被験者の迷路内での行動とそのときの心理状態, 迷路内の行動と被験者の性格との関係について検討を行った. また数量化理論第3類を用いて個人特性から被験者の行動パターンを推定することを試みた結果, 性別・年齢・職業・3つの性格尺度の計6個の個人捺印こよって一部の行動パターンをある程度分離することができた.