About KOJIMA KOJI
About 下水道事業団
About sewerage
About public administration
About database
About management
About local government
About document
About asset
About optimization
About forecast
About improvement
About AMDB
About asset management
About sewerage ledger
About Japan Sewage Works Agency
About degradation prediction
About Sewerage engineering and wastewater treatment in general
About アセットマネジメント
About データベース
About 活用
About 下水道
About 資産
About 最適化