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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.

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
- 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.