1. Postgraduate Program in Pyhsics, Universitas Sumatera Utara,Medan,Indonesia
2. Universitas Sumatera Utara,Departement of Physics,Medan,Indonesia
3. Program in Applied of Instrumentation Sekolah Tinggi Meteorologi, Klimatologi dan Geofisika,Jakarta,Indonesia
4. Instrumentation and Control Program, Institut Teknologi Bandung,Bandung,Indonesia