1. Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia
2. Faculty of Electrical & Electronic Engineering, Universiti Malaysia Pahang, 26600 Pekan, Malaysia
3. Department of Electrical Engineering, Faculty of Engineering, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
4. Department of Instrumentation and Control Engineering, Hanbat National University, Daejeon 305-719, Republic of Korea