1. Department
of Electrical and Computer Engineering, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
2. Department
of Electrical Engineering, Center for Integrated Systems, Stanford University, Stanford, California 94305-4075, United States
3. Chevron Energy Technology Company, 100 Chevron Way, Richmond, California 94801, United States
4. Chevron Energy Technology Company, 3901 Briarpark, Houston, Texas 77042, United States