1. Department of Civil and Environmental Engineering, National Institute of Technology, Oita College
2. City Planning Department, Oita City
3. Department of Civil Engineering, National Institute of Technology, Fukui College
4. Equipment Division, Nippon Steel and Sumikin, Oita Works
5. Production Scheduling & Contracting Division, Nippon Steel and Sumikin, Oita Works
6. Oita Office, Marketing Division, Nippon Steel and Sumikin Slag Products