Business career
1. 2006/04/01 ~ 2008/03/31  
2. 2006/04/01 ~ 2019/03/31  
3. 2001/04/01 ~ 2019/03/31  
4. 1998/04/01 ~ 1999/06/30  
5. 1996/04/01 ~ 1997/03/31  
Present specialized field