1. a Graduate Institute of Management Science, Ming Chuan University, 250 Section 5, Chung Shan North Road, Taipei 111, Taiwan, ROC
2. b Graduate Institute of Management Science, Ming Chuan University, 250 Section 5, Chung Shan North Road, Taipei 111, Taiwan, ROC Department of Shipping Management, China College of Marine Technology and Commerce, 212 Section 9, Yen Ping North Road, Taipei 111, Taiwan, ROC