Name the scientific Advisor to the Defence Minister and DRDO's DG (Missiles & Strategic Systems) who has won the first IEI-IEEE Award for Engineering Excellence - 2015 in recognition of his significant national contributions towards missiles and aerospace technologies.
In a certain code language, 'x' represents '+', '÷' represents 'x', '-' represents '÷' and '+' represents '-'. Find out the answer to the following question.