This thesis presents a formal model of object-oriented concepts; in particular we focus on the concepts found useful by experienced designers of reusable software components. The value of the formal model is shown by ...

We make some observations concerning the set C*n of real nonnegative, symmetric and diagonally dominant matrices of order n. This set is a convex cone and we determine its extreme rays. From this we derive different results, ...

This doctorate thesis is an exploratory study of distributed and computer-mediated collaborative learning. The work lies in the intersection of the research domains: Computer Support for Collaborative Learning (CSCL) and ...

An important problem in image analysis is to segment an image into regions with different class-labels. This is releveant in applications in medicine and cartography. In a proper statistical framework this problem may be ...

We outline the link between automorphisms (symmetries) of manifolds and algebraic K-theory of spaces. Then we discuss recent two-primary calculations for the algebraic K-theory of a point, and obtain a two-primary description ...

The report summarizes the work performed at the Department of Mathematics, during the first two years of the European research project GITEC-TWO (contract ENV4-U96-0297). Some of the result will subsequently be published ...