Course participation

I will participate in the course “Generalized linear modelling and survival analysis” which will run from 2. February to 30. Marts every Monday and Tuesday.

New position

The 1. of january 2004 I have started as a project scientist at the Biometry Research Unit, Danish Institute of Agricultural Sciences, Research Centre Foulum. My employment is for half a year.

My Ph.D. fall 2003

I am currently finishing my thesis which will be submitted 4. December (see publications).

My Ph.D. spring 2003

Submitted a draft of the working paper “Bicriterion shortest hyperpaths in random time-dependent networks”. Currently working on a improved branching rule for bi-SBT when two distance functions are considered. Started to work on my thesis. Teaching: Student assistant in “Mathematical Programming I” (1 class).

My Ph.D spring 2002

Finished a draft on bricriterion shortest hyperpaths in random time-dependent networks (see publications). Summer School: “Nordic Summer School on Applied Optimization and Modelling”, Sandvig, Bornholm, Denmark, May 5 – 11, 2002. Conferences: “MCDM Winter Conference 2002”, Semmeing, Austria, February 18-22, 2002. “IFORS 2002”, Edinburgh, Scotland, July 8 – 12, 2002. Teaching: Student assistant in “Mathematical Programming I” (1 class).

My Ph.D. fall 2001

I started on completing the papers in my progress report so that they can be submitted to a journal. Professor Daniele Pretolani visited me from September 23 to October 23 where a draft of the paper “Finding the K shortest hyperpaths: algorithms and applications” was made and submitted (see publications). I was so lucky that my girlfriend gave birth to a beautiful boy “Mads” on 3650 grams 🙂 Conferences: “Nordic MPS 2001”, University of Copenhagen, Denmark, November 15-17, 2001. Teaching: Student assistant in “Mat alpha” (2 classes).

My Ph.D. spring 2001

Wrote my progress report for my midterm exam (23 May.). Courses: “Logic-based methods for optimization” – Study group about how to use logic-based methods to solve mathematical programming models. “Ph.D. course in scientific writing”, University of Aarhus. Summer School: “Donet Summer School – Integer and Combinatorial Optimization”, Utrecht, The Netherlands, June 11 – 12, 2001. Conferences: “IPCO 2001 – Eighth Conference on Integer Programming and Combinatorial Optimization”, Utrecht, The Netherlands, June 13 – 15, 2001. Teaching: Student assistant in “Management Science and Operations Research 4” (Drøk 4 – 1½ classes).

My Ph.D. fall 2000

I have been staying in Camerino, Italy for 3 months where I have visited professor Daniele Pretolani. During my stay, we developed procedures to solve the k’th shortest hyperpath problem and the bi-SBT problem. The k’th shortest hyperpath problem is solved using a new branching rule which divides the hypergraph into subhypergraphs. The bi-SBT problem is solved using different methods which are tested against each other (simple k’th method, two-phases method and k’th diagonal method). During my stay I also found a small error in the definition of a hyperpath which has been used in many papers. I therefore wrote a short note with a new definition (see publications).

My Ph.D. spring 2000

I have started a project on bicriterion shortest hyperpaths (bi-SBT) together with my supervisor Kim Allan Andersen. This is a totally new research area, and we have to start from scratch by defining a bicriterion hypergraph and formulating the bi-SBT problem. First, I began studying the bicriterion shortest path problem and the methods to solve it. There are two main approaches, namely node labeling and path/tree. The node labeling approach seems to be hard to transfer to hypergraphs because a hyperpath has a more complex structure than a path, resulting in more complex node labeling procedure. Furthermore, an efficient path satisfies that its subpaths are efficient; this is not always the case for hyperpaths. The path/tree approach seems more adaptable to hypergraphs. Most papers use a k’th shortest path subprocedure to solve the problem. Therefore I first developed methods to solve the k’th shortest hyperpath problem. Conferences: “Probabilistic methods in […]