About YANAGAWA RYOICHI
About OKAMOTO TAKAHIRO
About 大阪防水建設社
About GIS-理論と応用
About natural disaster
About road
About emergency countermeasure
About routing
About Kagawa prefecture
About route
About shortest route problem
About road network
About risk
About risk assessment
About road improvement
About mountainous region
About shortest paths
About disaster risk
About General
About 香川
About 高松
About 起点
About 災害
About 四国
About 陸域
About 輸送
About 最短経路
About 災害リスク
About 定量化