Journal articles

• (with L.C. Chan and M.K. Ng) Spectral Analysis for HSS Preconditioners, Numerical Mathematics: Theory, Methods and Applications, 1 (2008) 57--77.
• (with C.K. Li and B.S. Tam) Linear maps preserving permutation and stochastic matrices, Linear Algebra and Its Applications, 341 (2002) 5--22.
• (with G. Cheung) On star-centers of some generalized numerical ranges and diagonals of normal matrices, Linear Algebra and Its Applications, 337 (2001) 109--119.
• (with J. Lam and H.K Tso) Robust deadbeat regulation, International Journal of Control, 67 (1997) 587--602.
• (with C.K. Li and F.Z. Zhang) Norm hull of vectors and matrices, Linear Algebra and Its Applications, 257 (1997) 1--27.
• (with W.S. Cheung) The C-numerical range of matrices is star-shaped, Linear and Multilinear Algebra, 41 (1996) 245--250.
• (with C.K. Li and F. Uhlig) Numerical ranges of an operator on an infinite inner product space, Electronic Journal of Linear Algebra, 1 (1996), 1--17.
• (with C.K. Li) Linear maps relating different unitary similarity orbits or different generalized numerical ranges, Linear Algebra and Its Applications, 223/224 (1995), 463--481.
• (with M.K.H. Fan and E.I. Verriest) On analyticity of functions involving eigenvalues, Linear Algebra and its Applications, 207 (1994), 159-180.
• (with A. Tits) When is the multiaffine image of a cube a convex polygon? Systems and Control Letters, 20 (1993), 439-445.
• (with C.K. Li) Linear operators leaving a class of matrices with fixed singular values invariant, Linear and Multilinear Algebra, 34 (1993), 41-49.
• (with C.K. Li) A survey on linear preserver problems, Chapter 5: Linear preservers on functions of singular values; Chapter 6: Linear preservers of numerical ranges, numerical radii and USI norms; Chapter 7: Linear preservers of relations and equivalence relations, Linear and Multilinear Algebra, 33 (1992), 53-84.
• (with C.K. Li) Linear preserver problems: a brief introduction and some special techniques, Linear Algebra and its Applications, 162-164 (1992), 217-236.
• (with C.K. Li and L. Rodman) Linear operators preserving certain equivalence relations originating in system theory, Linear Algebra and its Applications, 161 (1992), 165-225.
• (with C.K. Li) G-invariant norms and G(c) radii, Linear Algebra and its Applications, 150 (1991), 179-194.
• (with C.K. Li) Matrices with circular symmetry on their unitary orbits or C-numerical ranges, Proc. Amer. Math. Soc., 111 (1991), 19-28.
• (with C.K. Li) On the k-th matrix numerical range, Linear and Multilinear Algebra, 28 (1991), 229-239.
• (with R.A. Horn and C.K. Li) Linear operators preserving certain equivalence relations on matrices, SIAM Journal on Matrix Analysis and Applications, 12 (1991), 195-204.
• (with C.K. Li) Duality between some linear preserver problems III: c-spectral norms and (skew-)symmetric matrices with fixed singular values, Linear Algebra and its Applications, 143 (1991), 67-97.
• (with F. Uhlig) Inertia, numerical range and zeros of quadratic forms for matrix pencils, SIAM Journal on Matrix Analysis and Applications, 12 (1991), 146-159.
• (with C.K. Li) Linear operators preserving unitary similarity invariant norms, Linear and Multilinear Algebra, 27 (1990), 213-224.
• Convexity of the largest singular value of e^DA₀e^-D -- a convexity lemma, IEEE Transactions on Automatic Control, 35 (1990), 748-749.
• (with C.K. Li) Linear operators preserving certain functions on singular values of matrices, Linear and Multilinear Algebra, 26 (1990), 133-143.
• (with C.K. Li) Linear operators preserving unitarily invariant norms of matrices, Linear and Multilinear Algebra, 26 (1990), 119-132.
• (with C.K. Li) Norms on Cartesian product of linear spaces, Tamkang J. of Math., 21 (1990), no.1, 35-39.
• On the norms used in computing the structured singular value, IEEE Transactions on Automatic Control, 35 (1990), no.2, 201-203.
• (with C.K. Li) G-invariant hermitian forms and G-invariant elliptical norms, SIAM Journal on Matrix Analysis and Applications, 10 (1989) 435-445.
• (with C.K. Li and C.H. Sung) c-Convex matrices: characterizations, inclusion relations and normality, Linear and Multilinear Algebra, 25 (1989), 275-287.
• (with C.K. Li) Distance to the convex hull of the unitary orbit with respect to unitary similarity invariant norms, Linear and Multilinear Algebra, 25 (1989), 93-103.
• (with C.K. Li) The numerical range of derivations, Linear Algebra and its Applications, 119 (1989), 97-119.
• (with C.K. Li) Norms that are invariant under unitary similarities, and the C-numerical radii, Linear and Multilinear Algebra, 24 (1989), 209-222.
• (with C.K. Li) Duality between some linear preserver problems II : isometries with respect to c-spectral norms and matrices with fixed singular values, Linear Algebra and its Applications, 110 (1988), 181-212.
• (with C.K. Li and B.S. Tam) Linear operators preserving the (p,q)-numerical range, Linear Algebra and its Applications, 110 (1988), 75-89.
• (with C.K. Li) Duality between some linear preservers problems: the invariance of C-numerical range, C-numerical radius and certain matrix set, Linear and Multilinear Algebra, 23 (1988), 353-362.
• (with C.K. Li) Linear operators preserving the decomposable numerical radius, Linear and Multilinear Algebra, 23 (1988), 333-341.
• (with C.K. Li) Some isometries of rectangular complex matrices, Linear and Multilinear Algebra, 23 (1988), 47-53.
• (with C.K. Li) Linear operators that preserve the c-numerical range or radius of matrices, Linear and Multilinear Algebra, 23 (1988), 27-46.
• (with Y.T. Poon) Inclusion relations between orthostochastic matrices and products of pinching matrices, Linear and Multilinear Algebra, 21 (1987), 253-259.
• Is aI(1-a)J orthostochastic?, Current Trends in Matrix Theory, 399-403, Elsevier Science Publishing Co. Inc. (1987).
• (with C.K. Li) On the unitarily invariant norms and some related results, Linear and Multilinear Algebra, 20 (1987), 107-119.
• (with C.K. Li and T.Y. Tam) The generalized spectral radius, numerical radius and spectral norm, Linear and Multilinear Algebra, 16 (1984), 215-237.
• (with M.K. Siu) You are living in a world of mathematics, International Journal of Mathematical Education in Science and Technology, 15 (1984), 47-52.
• The constrained bilinear form and the C-numerical range, Linear Algebra and its Applications, 56 (1984), 195-206.
• Infinite-dimensional Banach spaces must have uncountable basis -- an elementary proof, Amer. Math. Monthly, 91 (1984), 505-506.
• (with Y.H. Au-Yeung) Some theorems on the generalized numerical ranges, Linear and Multilinear Algebra, 15 (1984), 3-11.
• (with Y.H. Au-Yeung) An extension of the Hausdorff-Toeplitz theorem on the numerical range, Proc. Amer. Math. Soc., 89 (1983), 215-218.
• (with Y.H. Au-Yeung) A conjecture of Marcus on the generalized numerical range, Linear and Multilinear Algebra, 14 (1983), 235-239.
• Diameter and minimal width of the numerical range, Linear and Multilinear Algebra, 14 (1983), 179-185.
• On the shape of the generalized numerical ranges, Linear and Multilinear Algebra, 10 (1981), 173-182.

Conference papers and proceedings

• (with W.K. Ching, K. Cheng, L. Li, and A.S.T. Wong) Weighted Local Least Squares Imputation Method for Missing Value Estimation, The International Symposium on Optimization and Systems Biology (OSB 2007), Lecture Notes in Operations Research 7, (2007) 280--287.
• (with J. Lam and H.K. Tso) On the design of robust deadbeat regulators, Proceedings of 35th IEEE Conference on Decision and Control, Kobe, Japan, December 11-31, 1996.
• (with A. Tits) On the multiaffine image of a cube, Robustness of Dynamic Systems with Parameter Uncertainties, 105-110, Berkh\"{a}user Verlag, 1992.
• (with J. Barlow, M. Fan, M. Takahashi, M. Tischler, and A. Tits) On the design of decoupling controllers for advanced rotorcraft in the hover case, American Institute of Aeronautics and Astronautics 29th Aerospace Sciences Meeting, Reno, Nevada, January, 1991.

PhD dissertations

• Computer-Based Techniques for Control System Design, with Applications to Rotorcraft Control, Electrical Engineering Department, University of Maryland, 1992.
• A Study of Generalized Numerical Ranges, Department of Mathematics, The University of Hong Kong, 1983.

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