This function optimizes log-likelihood of DCC-GARCH model.
dcc_optim(param, ht, residuals, stdresids, uncR)
DCC-GARCH parameters(alpha,beta)
matrix of conditional variance vectors (T by N)
matrix of residual(de-mean) returns (T by N)
matrix of standrdized(De-GARCH) residual returns (T by N)
unconditional correlation matrix of stdresids (N by N)
results of optimization