Before revision:  Additionally, the NOSAS methods have good parallelization properties , and the size of the coarse problem is equal to the total number of eigenvalues chosen in each subdomain and which might be related to the number of islands or channels with high coefficient that touch the boundary of the subdomains .
After revision:  Additionally, the NOSAS methods have good parallelization properties , and the size of the coarse problem is equal to the total number of eigenvalues chosen in each subdomain . It is only related to the number of islands or channels with high coefficient that touch the boundary of the subdomains .