Finally my stress is released a bit. ? Huge congratulations to my PhD student Lee Shu Chi, who has just passed her viva with excellent result. Thank you very much to external examiner, PM. Dr. Fatimah De’nan (USM) and internal examiner, PM. Dr. Arizu Sulaiman. Also Thanks to the very professional chairman and his assistant, Prof. Ir. Dr. Rosli Zin and Dr. Noor Nabilah Sarbini.