  The paper deals with Hawking radiation from both a general static black hole
and a nonstatic spherically symmetric black hole. In case of static black hole,
tunnelling of nonzero mass particles is considered and due to complicated
calculations, quantum corrections are calculated only up to the first order.
The results are compared with those for massless particles near the horizon. On
the other hand, for dynamical black hole, quantum corrections are incorporated
using the Hamilton-Jacobi method beyond semiclassical approximation. It is
found that different order correction terms satisfy identical differential
equation and are solved by a typical technique. Finally, using the law of black
hole mechanics, a general modified form of the black hole entropy is obtained
considering modified Hawking temperature.
