email: ken at phys-h.keio.ac.jp.NOSPAM phone: 045-563-1111 (or 1122) x3530 (office 200B) 03-5731-7038,03-3717-0995 (home) fax: 045-563-4235 (office) url: http://dabui.econ.hc.keio.ac.jp./~ken Dept. of Physics, Keio University, Hiyoshi Campus, Hiyoshi, Yokohama 223-8521, JAPAN PGP key: http://dabui.econ.hc.keio.ac.jp./~ken/pgpkey