1. Grad. Student, Ctr. for Risk Mgmt. of Engrg. Sys., Thornton Hall, Univ. of Virginia, Charlottesville, VA 22903.
2. Dir., Ctr. for Risk Mgmt. of Engrg. Sys., Quarles Prof. of Sys. Engrg. and Civ. Engrg., Thornton Hall, Univ. of Virginia, Charlottesville, VA; corresponding author.
3. Res. Asst. Prof., Ctr. for Risk Mgmt. of Engrg. Sys., Thornton Hall, Univ. of Virginia, Charlottesville, VA.