| Name | Duration | Project |
| Affiliation | Country | |
| 安室 喜弘 | 1999/03?1999/09 | |
| Massachusetts Institute of Technology | USA | |
| 佐々木 博史 | 2000/06?2000/09,2001/10?2002/01 | |
| University of Oulu | Finland | |
| 黒田 知宏 | 2001/03?2001/09 | |
| University of Oulu | Finland | |
| 南 広一 | 2001/05?2001/08 | |
| VTT Electronics | Finland | |
| 眞鍋 佳嗣 | 2001/06?2002/03 | |
| University of Joensuu | Finland | |
| 木村 篤信 | 2001/06?2002/01 | |
| University of Oulu | Finland | |
| 井村 誠孝 | 2003/07?2003/09 | |
| Universite Catholique de Louvain | Belgium | |
| 萩原 香織 | 2005/02?2005/03 | |
| Universite Catholique de Louvain | Belgium | |
| 眞鍋 佳嗣 | 2005/03 | |
| University of Joensuu | Finland | |
| Name | Duration | Project |
| Affiliation | Country | |
| Dr. Anping Yu | 1993/09/01?1993/12/01 | JSUM |
| Fudan Univ. | China | |
| Prof. Per Ask | 1996/12/19?1997/01/21 | |
| Linkoping Univ. | Sweden | |
| Assoc. Prof. Jan Woijiski | 1997/01/04?1997/04/05 | |
| IBBE | Poland | |
| Tomi Korpipää | 1999/11/01?2001/03/31 | TAO |
| VTT Electronics | Finland | |
| Dr. Xiaofeng Wu | 1999/10/13?2002/03/31 | JSPS |
| China | ||
| Dr. Piotr Ladyzynski | 2000/03/23?2001/03/31 | JSPS |
| IBBE PAS | Poland | |
| William Rieken | 2001/04/01?2003/03/31 | TAO |
| USA | ||
| Joshua Hale | 2001/06/01?2001/08/31 | |
| Glasgow University | UK | |
| Philippe Fonteyn | 2001/09/01?2002/03/31 | TAO |
| Universite Catholique de Louvain | Bergium | |
| Tai Sen Wang | 2001/09/01?2002/03/31 | JSPS |
| Changchun Institute Of Post & Telecommunications | China | |
| Christian Faisstnauer | 2001/03/27?2003/12/22 | CREST, VBL |
| Vienna University of technology | Italy | |
| Damien Douxchamps | 2004/11/01? | VBL |
| Universite Catholique de Louvain | Belgium | |
| Jaakko Hyry | 2009/6/11?2009/12/18 | |
| University of Oulu | Finland | |
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