Enrico Gobbetti (1)(2) and Andrea O. Leone (3)

(1) UMBC, CSEE Dept., Baltimore, MD 21229 USA
(2) CESDIS , NASA GSFC, Greenbelt, MD USA
(3) CRS4 , Via Sauro 10, 09123 Cagliari, Italy

E-mail: gobbetti@cs.umbc.edu, cirio@crs4.it