spiral model

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'spiral model' can also refer to...

spiral model

spiral model

Modelling magnetic fields in spiral galaxies

Spiral growth in plants: models and simulations

The Primordial Origin Model of Magnetic Fields in Spiral Galaxies


Classifying and modelling spiral structures in hydrodynamic simulations of astrophysical discs

Orbital structure in N-body models of barred-spiral galaxies

A Nonlinear-Open-System Model for Star Formation in Spiral Galaxies

Dark matter and MOND dynamical models of the massive spiral galaxy NGC 2841

A self-consistent model of the spiral structure of the Galaxy

Chaotic motion and spiral structure in self-consistent models of rotating galaxies

Dynamical modelling of the remarkable four-armed barred spiral galaxy ESO 566−24

BeWo cells stimulate smooth muscle cell apoptosis and elastin breakdown in a model of spiral artery transformation

Modelling the effect of spacing and site exposure on spiral grain angle on Sitka spruce (Picea sitchensis (Bong.) Carr.) in Northern Britain

From Social Perception to Public Expression of Opinion: A Structural Equation Modeling Approach to the Spiral of Silence

On a persistent large discrepancy in some parameters of the spiral arms in the Milky Way – a statistical and modelling analysis

Vertical gradients of azimuthal velocity in a global thin-disc model of spiral galaxies NGC 2403, NGC 4559, NGC 4302 and NGC 5775

Angular ellipticity correlations in a composite alignment model for elliptical and spiral galaxies and inference from weak lensing


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A software life-cycle model devised by Barry Boehm that encompasses a management strategy, a life-cycle development model, and risk assessment. The model takes its name from the spiral representation. Beginning at the center of the spiral, where there is limited detailed knowledge of requirements and small costs, successive refinement of the software is shown as a traverse around the spiral, with a corresponding accumulation of costs as the length of the spiral increases. Interaction between phases is not shown directly since the model assumes a sequence of successive refinements coupled to decisions that project risks associated with the next refinement are acceptable. Each 360° rotation around the center of the spiral passes through four stages: planning, seeking alternatives, evaluation of alternatives and risks, and (in the lower right quadrant) activities equivalent to the phases represented in waterfall or V-models.

Subjects: Computing.

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