Model validation constitutes a very important step in system dynamics methodology. Yet, both published and informal evidence indicates that there has been little effort in system dynamics community explicitly devoted to model validity and validation. Validation is a prolonged and complicated process, involving both formal/quantitative tools and informal/ qualitative ones. This paper focuses on ...

Model validation in model-driven development gains in importance as the systems grow in size and complexity. In this situation an efficiency of validation execution and an immediate feedback whether a recent manual edit operation broke a validation rule is desirable. To increase efficiency, incremental model validation tries to minimize the proportions of the model that have to be rechecked by ...

a mathematical model was developed to predict the effects of wind speed, light, ph, temperature, dissolved carbon dioxide and chemical oxygen demand (cod) on dissolved oxygen (do) in fish ponds. the effects of organic feeds, aeration and fish activity were added to the model developed by kayombo et al. for waste stabilization ponds (ecological modeling 127(2000): 21-31) to reflect the situat...

The CCP4 Study Weekend 2011 was held at the University of Warwick on the 6–7 January. Following a long established tradition of discussing at the Study Weekend the most important crystallographic topics, the choice for 2011 was the 'Model building, refinement and validation' triple bill. As a result of the extraordinary efforts of instrumentation and software developers, macromolecular crystall...

Objects deform in response to contact forces exerted on them. The deformation depends on material properties, the geometry of the object and external forces. This thesis develops a robotic system for automatically acquiring observations of a deforming object and for estimating a model of the deformation from these observations. Models of deformable objects are in wide-spread use in simulation, ...

This session offers an open forum to discuss issues and directions of research in the areas of model updating, predictive quality of computer simulations, model validation and uncertainty quantification. Technical presentations review the state-of-the-art in nonlinear dynamics and model validation for structural dynamics. A panel discussion introduces the discussion on technology needs, future ...

Model transformation has become one of the most focused research field, motivated by for instance the OMG’s Model-Driven Architecture (MDA). Metamodeling is a central technique in the design of visual languages, and it reuses existing domains by extending the metamodel level. Metamodel-based software development requires the transformation of the models between various stages. These transformat...

ABSTRACT Classical validation methods accept or reject a model as a valid representation of a plant. However this quantization has several problems: i) Models are neither good nor bad but have a certain valid frequency range. ii) This gives no guess on the failure reasons or the way the model could be improved. iii) In iterative identification and control approaches undermodeling is usually pre...