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Z.-L. Zhang and Y.T. Hou, "Method and apparatus for packet scheduling using virtual time stamp for high capacity combined input and output queued switching system," US Patent No. 7,277,962, issued on October 2, 2007.

Z.-L. Zhang, Y.T. Hou, and Z. Duan, "Method and apparatus for a bandwidth broker system in a packet network," US Patent No. 7,257,632, issued on August 14, 2007.

Y.T. Hou, Y. Dong, and T. Taniguchi, "Server-based network performance metrics generation system and method," US patent No. 6,901,051, issued on May 31, 2005.

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