Roger C. E. Tan

Suicides in Hong-Kong and Singapore: a tale of two cities

Suicide statistics from Hong Kong and Singapore over the period 1984-1994 were studied. The suicide behaviours in Hong Kong and Singapore are remarkably similar. Suicide rates increased with age, with a sharp increase among the elderly which was about four to five times the average. A relatively low male:female ratio and low teenage suicide were also found. Jumping from a height was the commonest method of suicide. Nevertheless, a different time trend of the suicide rates was observed, with an upward and downward trend for Hong Kong and Singapore respectively. The cultural, social and economic aspects in understand ing suicidal behaviour in Hong Kong and Singapore are also discussed.

Computation of Derivatives of Repeated Eigenvalues and the Corresponding Eigenvectors of Symmetric Matrix Pencils

This paper presents and analyzes new algorithms for computing the numerical values of derivatives, of arbitrary order, and of eigenvalues and eigenvectors of

Solving Degenerate Reaction-Diffusion Equations via Variable Step Peaceman-Rachford Splitting

{\bf A}(\rho){\bf x}(\rho) = \lambda(\rho){\bf B}(\rho){\bf x}(\rho)

Algebraic Characterizations for Positive Realness of Descriptor Systems

at a point

A Numerical Method for a Generalized Algebraic Riccati Equation

\rho=\rho_0

On the numerical computation of a structural decomposition in systems and control

at which the eigenvalues considered are multiple. Here

Iterative computation of derivatives of repeated eigenvalues and the corresponding eigenvectors

{\bf A}(\rho)

A splitting moving mesh method for reaction-diffusion equations of quenching type

and

Computing Derivatives of Repeated Eigenvalues and Corresponding Eigenvectors of Quadratic Eigenvalue Problems

{\bf B}(\rho)

The Local

are hermitian matrices which depend analytically on a single real variable