For Chosun University, what was its score on "Influence Rank" in 2015?
Chosun University refers to university_name = 'Chosun University'; in 2015 refers to year = 2015; on "Influence Rank" refers to criteria_name = 'Influence Rank';
SELECT T2.score FROM ranking_criteria AS T1 INNER JOIN university_ranking_year AS T2 ON T1.id = T2.ranking_criteria_id INNER JOIN university AS T3 ON T3.id = T2.university_id WHERE T3.university_name = 'Chosun University' AND T1.criteria_name = 'Influence Rank' AND T2.year = 2015