1800-1870 1935- 1984-2007 19thcentury 2007 biography blacksburg campusviolence facultyvirginiapolytechnicinstituteandstateuniversity history intellectuallife korea korea(south) massmurder politicians pyŏng-dŏk scholars schoolshootings seung-hui socialconditions studentsvirginiapolytechnicinstituteandstateuniversity sun-hyŏng virginia virginiatechshootings 조병덕 조순형