Department of Computer Science and Information Technology, University of the District of Columbia, Washington, DC 20008, USA. lliang@udc.edu|Department of Computer Science and Information Technology, University of the District of Columbia, Washington, DC 20008, USA. lliang@udc.edu|Department of Computer Science and Information Technology, University of the District of Columbia, Washington, DC 20008, USA. lliang@udc.edu|Department of Computer Science and Information Technology, University of the District of Columbia, Washington, DC 20008, USA. lliang@udc.edu|Department of Computer Science and Information Technology, University of the District of Columbia, Washington, DC 20008, USA. lliang@udc.edu|Department of Computer Science and Information Technology, University of the District of Columbia, Washington, DC 20008, USA. lliang@udc.edu|Department of Computer Science and Information Technology, University of the District of Columbia, Washington, DC 20008, USA. lliang@udc.edu