1. Department of Electrical, Electronic and Computer EngineeringFaculty of EngineeringGifu UniversityGifu‐shiJapan
2. Department of Electrical, Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentNational University of Malaysia (UKM)SelangorMalaysia
3. Graduate School of Science and EngineeringYamagata UniversityYonezawa‐shiJapan