W. G. C. W. KUMARA*, TIMOTHY K. SHIH* AND SHIH-MING CHANG+
* Department of Computer Science and Information Engineering
National Central University
Jhongli City, Taoyuan, 320 Taiwan
+ Department of Computer Science and Information Engineering
Tamkang University
Tamsui, New Taipei City, 251 Taiwan
E-mail: {chinthakawk; timothykshih}@gmail.com; rest306@hotmail.com