1. Information Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), AIST Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
2. Toshiba Corporation Semiconductor & Storage Products Company 1, Lithography Process Development Group 1, Lithography Process Technology Department, Center for Semiconductor Research & Development, Komukai Toshiba-Cho, Saiwai-Ku, Kawasaki 212-8583, Japan