Department of Computer Engineering, Kyungpook National University, Daegu, Korea.|Department of Computer Engineering, Kyungpook National University, Daegu, Korea.|Department of Computer Engineering, Kyungpook National University, Daegu, Korea.|Department of Computer Engineering, Kyungpook National University, Daegu, Korea.|Department of Computer Engineering, Kyungpook National University, Daegu, Korea.|Department of Computer Engineering, Kyungpook National University, Daegu, Korea.|Department of Computer Engineering, Kyungpook National University, Daegu, Korea.