1. Graduate Assistant, Dept. of Construction Management, Univ. of Nebraska-Lincoln, NH 122, Lincoln, NE 68588.
2. Graduate Assistant, Dept. of Mechanical and Materials Engineering, Univ. of Nebraska-Lincoln, NH 303B, Lincoln, NE 68588.
3. Associate Professor, Dept. of Construction Management, Univ. of Nebraska-Lincoln, W145 NH, Lincoln, NE 68588 (corresponding author).
4. Associate Professor, Dept. of Mechanical and Materials Engineering, Univ. of Nebraska-Lincoln, W317.2 NH, Lincoln, NE 68588.