1. UPM,Dept. of Computer & Communication Systems Engineering,Serdang,Selangor,Malaysia
2. UPM,WiPNET Research Centre,Dept. of Computer & Communication Systems Engineering,Serdang,Selangor,Malaysia
3. UPM,Dept. of Biological & Agricultural Engineering,Serdang,Selangor,Malaysia
4. UOB,College of Education for Pure Sciences,Dept. of Physics,Babylon,Iraq