Jinlu Sheng@School of Logistics, Southwest Jiaotong University, Chengdu 610031--Zuping Guo@Qingdao Ocean Shipping Mariners' College, Qingdao 266071--Xiaoling Zhao@Qingdao Ocean Shipping Mariners' College, Qingdao 266071--Fanhui Xing@Dalian Maritime University, Dalian 116026--;
shipping power station; questionnaire; investigation; operation training; fuzzy entropy; evaluation;