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Heidi Elisabeth Iuell Dahl

Research Scientist

Heidi Elisabeth Iuell Dahl

Research Scientist

Heidi Elisabeth Iuell Dahl
Phone: 470 77 444
Mobile: 470 77 444
Department: Mathematics and Cybernetics
Office: Oslo

Publications and responsibilities

Publications

Publication

Isotropic Möbius Geometry and i-M Circles on Singular Isotropic Cyclides

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1337407

The Möbius geometry of R 3 has an isotropic counterpart in R 3 ++0 . We describe the isotropic Möbius model of surfaces in R 3 ++0 and show how the degree of a surface changes under i-M inversions while the number of families of i-M circles remain constant. This gives us a generalization of the clas...

Year 2015
Type Journal publication
Publication

Piecewise Rational Parametrizations of Canal Surfaces

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1197536

Canal surfaces, as envelopes of one-parameter families of spheres, correspond to curves in Minkowski space. We show that the continuity properties of a canal surface are inherited from the continuity properties of the associated curve, i.e., two curves joined with G 1 or G 2 continuity in Minkowski ...

Year 2014
Type Part of a book/report
Publication

Rational Parametrizations of Edge and Corner Blends for Isogeometric Analysis

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1181408

Rational variable radius rolling ball blends between pairs of natural quadrics can be constructed from rational curves in their bisector surface in R 3,1 . For certain configurations of natural quadrics, these curves can be constructed by taking hyperplane sections, or by constructing Bézier curves ...

Year 2014
Type Part of a book/report
Publication

A modular approach to the modelling and analysis of risk scenarios with mutual depenencies

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1344255

This report describes a modular approach to the modelling and analysis of risk scenarios with mutual dependencies. The presented approach may be used to deduce the risk-level of an overall system from previous risk analyses of its constituent systems. It may also be used to decompose the analysis of...

Authors Brændeland Gyrd Dahl Heidi Elisabeth Iuell Stølen Ketil
Year 2008
Type Report/thesis
Publication

Using dependent CORAS diagams to analyse mutual dependency

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+357044

The CORAS method for security risk analysis provides a customized language, the CORAS diagrams, for threat and risk modelling. In this paper, we extend this language to capture context dependencies, and use it as a means to analyse mutual dependency. We refer to the extension as dependent CORAS diag...

Authors Brændeland Gyrd Stølen Ketil Dahl Heidi Elisabeth Iuell Engan Iselin
Year 2008
Type Journal publication
Publication

Structured Semantics for the CORAS Security Risk Modelling Language

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1352207

The CORAS security risk modelling language is a customised graphical language for com- munication, documentation and analysis of security threat and risk scenarios. We present a textual syntax and a structured semantics for each of the five different types of CORAS di- agrams, together with step-by-...

Year 2007
Type Report/thesis
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