1. Mechanical and Aerospace Engineering Department, Rutgers, the State University of New Jersey, 98 Brett Road, Piscataway, New Jersey 08854-8058
2. Department of Mechanical Engineering, California State University, Fresno, 2320 E San Ramon Ave., Fresno, California 93740
3. Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, 1185 Perry Street, Blacksburg, Virginia 24061