I. Invited plenary talks   Extremal sparsity property of the Jordan canonical form,   PDF file   The 8th conference of China matrix theory and applications,   Taiyuan Normal University, Taiyuan, China   July 16-18, 2008 On nonnegative imprimitive matrices,   PDF file   The 7th conference of China matrix theory and applications,   University of Electronic Science and Technology, Chengdu, China   July 17-20, 2006 Extremal eigenvalues of real symmetric matrices with entries in an interval,   PDF file   The 12th conference of the International Linear Algebra Society,   University of Regina, Canada,   June 26-29, 2005 Submultiplicativity vs subadditivity for unitarily invariant norms,   The 6th conference of China matrix theory and applications,   Heilongjiang University, Harbin, China   July 18-20, 2004 On the unitary orbit of complex matrices,   The 5th conference of China matrix theory and applications,   Shanghai University, Shanghai, China   August 14-18, 2002 Inequalities for unitarily invariant norms,   The 3rd conference of China matrix theory and applications,   Zhang Jia Jie, China   August 8-13, 1998

II. Invited 45-minute talk   Open Problems in Matrix Theory,   PDF file   The 4th International Congress of Chinese Mathematicians，   Zhejiang University, Hangzhou, China   Dec. 17-22, 2007

III. Invited ILAS lecture   Unsolved Matrix Problems,   PDF file   Advanced Workshop on Trends and Developments in Linear Algebra，   ICTP, Trieste, Italy   July 6-10, 2009

IV. Invited 30-minute talk   Digraphs that have at most one walk of a given length with the same endpoints,   PDF file   The 4th National Conference on Combinatorial Mathematics and Graph Theory,   Xuzhou Normal University, Xuzhou, China   August 22-25, 2010

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