| 44th | (Gaithersburg@Feb. 2013) |
| 43rd | (Tsukuba Aug 2011) |
| 42nd | (San Francisco Feb 2011) |
| 41st | (Tsukuba May 2009) |
| 40th | (Gaithersburg May 2008) |
| 39th | (Tsukuba May 2007) |
| 38th | (Gaithersburg May 2006) |
| 37th | (Tsukuba May 2005) |
| 36th | (Gaithersburg May 2004) |
| 35th | (Tsukuba May 2003) |
| 34th | (Gaithersburg May 2002) |
| 33rd | (Tsukuba May 2001) |
| 32nd | (Gaithersburg May 2000) |
| 31st | (Tsukuba May 1999) |
| 30th | (Gaithersburg May 1998)* |
| 29th | (Tsukuba May 1997)* |
| * Only Technical Papers |