Setting up simple relational database structure
Unless you embed a list of pos_div_name in a column with type TEXT, you need to create table POS_STRUCT_DIV (POS_div in your diagram) as it has one-to-many relationship with POS_STRUCT. 

You could use pos_div_name as the foreign key in the MEMBER as the name is never change. It saves you from looking up pos_div_name when loading MEMBER but the row size could be larger. So it is up to you.