The AACC 2004 O. Hugo Schuck Best Paper Award has been presented to Xiaotian Sun, Laura Muñoz and Professor Roberto Horowitz for their paper, "Mixture Kalman Filter Based Highway Congestion Mode and Vehicle Density Estimation and its Application." The award was presented at the Awards Luncheon during the 2005 American Control Conference in Portland, Oregon on June 09, 2005.

The O. Hugo Schuck Awards are given to recognize the best two papers presented at the previous American Control Conference. One award is for a paper emphasizing contributions to theory and the other award is for a paper emphasizing significant or innovative applications. Criteria for selection include the quality of the written and oral presentation, the technical contribution, timeliness, and practicality. The award is named for O. Hugo Schuck, a pioneer in the practice of flight control design at Honeywell, Inc., and later at NASA.