Walter Lioen at

[My job] [Projects] [Publications] [Web Server Statistics]

My job at CWI

I was a scientific programmer at CWI from April 1, 1985 until December 1, 2001. CWI, or Centrum voor Wiskunde en Informatica in full, is the national research institute for mathematics and computer science in the Netherlands.

Projects

Up to and including December 1996, CWI's scientific research was subdivided into six departments and I was working in the Numerical Mathematics department. As of January 1997, CWI's scientific research is organized in four clusters of related themes running several projects and until December 1999 I was a member of the Modeling, Analysis and Simulation (MAS) cluster, where I worked on numerical as well as number theoretical problems. I tried to adapt existing algorithms or design new algorithms and implemented them on parallel and/or vector computers. I also worked on clusters of workstations using PVM, the Parallel Virtual Machine.

• Numerical algorithms for air quality modeling
  • TM3, Tracer Model Version 3, a global photochemical dispersion model
  • LOTOS, Long Term Ozone Simulation, on the Cray T3E
• Parallel Software for Implicit Differential Equations
  This project is sponsored by the Dutch Technology Foundation, STW (projects: CWI.4533, Parallel Software for Implicit Differential Equations; and CWI.2703, Parallel Codes for Circuit Analysis and Control Engineering). I spent much time on PSIDE, a Fortran 77 code for solving Implicit Differential Equations on shared memory parallel computers, and on the Test Set for IVP solvers.
• Computational number theory and data security
  • Factorization of large integers.
  • Numerical sieve methods for number-theoretical problems.

As of January 1, 2000 I was member of the Theme Data Mining and Knowledge Discovery.

Publications

List of publications

---

Last modified: October 27, 2005
Walter M. Lioen <walter@lioen.com>