1. Department of Information Science and Intelligent SystemsTokushima University, 2‐1 Minamijosanjima‐cho 770‐8506 Japan
2. Faculty of Manufacturing EngineeringUniversiti Teknikal Malaysia Melaka 76100 Durian Tunggal Melaka Malaysia
3. Department of MethodologyInternational Islamic University College Selangor, Bandar Seri Putra Kajang 43000 Selangor Malaysia