What do A pos and C pos mean?
The # column is the rank of each listed entry for Ruquan Ye — rank 1 means this entry is where Ruquan Ye has the most articles or citations. A pos and C pos show the reciprocal: the position of Ruquan Ye within that entry's own ranked list, by articles and citations respectively. A low value means Ruquan Ye is among the most prominent contributors for that entry.