It is said that the late founder of Hyundai helped break the isolation of N Korea by striding across the DMZ with a herd of cattle. Google’s Executive Chair Eric Schmidt is going to N Korea. Is he taking with him promises of 21st Century cattle? And as the Internet began connecting the world — a movement South Korea embraced — North Korea reinforced its moat of security. Travelers arriving in Pyongyang are ordered to leave their cellphones at the airport and all devices are checked for satellite communications.