1. Assistant Professor, Univ. of Missouri, Columbia, E2503 Lafferre Hall, Columbia, MO 65211 (corresponding author).
2. Associate Professor, Univ. of Missouri, Columbia, E2503 Lafferre Hall, Columbia, MO 65211.
3. Research Engineer, Univ. of Missouri, Columbia, E2503 Lafferre Hall, Columbia, MO 65211.
4. Graduate Student, Univ. of Missouri, Columbia, E2503 Lafferre Hall, Columbia, MO 65211.