1. Shanghai Maritime University,Dept. of Electrical Engineering,Shanghai,China
2. Aswan University,Dept. of Engineering,Aswan,Egypt
3. Technical University of Crete,School of Electrical and Computer Eng.,Chania,Greece
4. University of Hong Kong,Dept. of Electrical Engineering City,Hong Kong,China
5. Aalborg University,Dept. of Energy Technology,Aalborg,Denmark