ham mad YAQUB 3 1 De part ment of Mechatronics En gi neer ing, Air Uni ver sity, Islamabad, Pa ki stan 2 De part ment of Math e mat ics, Na tional Uni ver sity of Com puter and Emerg ing Sci ences, Islamabad, Pa ki stan 3 De part ment of Math e mat ics, Riphah In ter na tional Uni ver sity, Islamabad, Pa ki stan Sci en tific pa per