[1] Cornell Univ, Sibley Sch Mech & Aerosp Engn, Ithaca, NY 14850 USA
[2] Arizona State Univ, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA
[3] Arizona State Univ, Sch Math & Stat Sci, Tempe, AZ 85287 USA
[4] Kyungpook Natl Univ, Dept Math, Taegu 702701, South Korea