Department of Computer Engineering, Istanbul University, Istanbul 34320, Turkey. egumus@istanbul.edu.tr|Department of Computer Engineering, Istanbul University, Istanbul 34320, Turkey. egumus@istanbul.edu.tr|Department of Computer Engineering, Istanbul University, Istanbul 34320, Turkey. egumus@istanbul.edu.tr|Department of Computer Engineering, Istanbul University, Istanbul 34320, Turkey. egumus@istanbul.edu.tr