Before revision:  we make full use of intraday informations by using pairwise realized correlations, (3) the covariance matrices are guaranteed to be positive definite, (4) we avoid the arbitrariness of the ordering of asset returns, (5)  propose the flexible correlation structure model (e.g.  such as setting some correlations to be identically zeros if necessary), and (6) the parsimonious specification for the leverage effect is proposed.
After revision:  we make full use of intraday informations by using pairwise realized correlations, (3) the covariance matrices are guaranteed to be positive definite, (4) we avoid the arbitrariness of the ordering of asset returns, (5) propose the flexible correlation structure model (e.g. such as setting some correlations to be zero if necessary), and (6) the parsimonious specification for the leverage effect is proposed.