Corporate spending on security measures has increased only slightly in the wake of the Sept. 11, 2001, terrorist attacks, according to a new study released yesterday by an organization representing company security managers. The nationwide survey of more than 330 security officials at large corporations, funded by the Alexandria professional group ASIS International, found just a 4 percent median increase in spending for corporate security since the attacks on the World Trade Center and the Pentagon. The median represents the point at which half those surveyed spent more than 4 percent on security, and half less. Full Story