1. United States Department of Agriculture, Agricultural Research Service, Northern Great Plains Research Laboratory, 1701 10th Avenue SW, Mandan, North Dakota 58554, United States
2. United States Department of Transportation, John A. Volpe National Transportation Systems Center, 55 Broadway, Cambridge, Massachusetts 02142-1093, United States
3. Department of Industrial Engineering, Naresuan University, Phitsanulok 65000, Thailand