1. Wicresoft Co., Ltd., Tokyo 1600023, Japan
2. Department of Intelligence Information Systems, Toyama University, Toyama 9308555, Japan
3. School of Computer Science and Communication Engineering, Jiangsu University, Xuefu Road, Zhenjiang 212013, China
4. Faculty of Electrical and Computer Engineering, Kanazawa University, Kakuma, Kanazawa 9201162, Japan