Table 8.

The assumed values of the parameters under the four cases.

Parameters	Case 1	Case 2	Case 3	Case 4
${\xi }_1$	3	3	1.2	1.2
${\xi }_2$	1	1	1	1
${\psi }_1$	2	2	2	2
${\psi }_2$	1	1	1	1
$f$	4	4	0.5	0.5
$e$	1.5	2.5	0.2	0.5