University of Regina
Canada
Jeju National University
South korea
Vienna University of Technology
Austria
National Laboratory of Engineering and Geology
Portugal
Bialystok University of Technology
Poland
University of Western Attica
Greece
Future Energy Research Institute of S.C.I.Energy
Switzerland
The Hong Kong Polytechnic University
Hong Kong
Universiti Malaysia Perlis
Malaysia
Emeritus Professor, Indian Institute of Technology Roorkee
India