Meta-modelling is one of the pillars of Model-Driven Engineering (MDE), where it is used for language engineering and domain modelling. Even though the current trend is the use of two-level meta-modelling frameworks, several researchers have pointed out limitations of this scheme for some scenarios and suggested a metamodelling approach with an arbitrary number of meta-levels in order to obtain more flexible and simpler system descriptions. Unfortunately, such multi-level meta-modelling systems are still in their infancy, lacking for example, integration with model manipulation languages, a characterization of different possibilities for instantiation and inheritance, and primitives for interconnecting multi-level languages in a flexible way. In this paper, we propose a number of extensions to multi-level (also called deep) meta-modelling, based on the needs raised by its use for practical MDE. In particular, we discuss on the issues related to code generation from deep languages, the benefits of allowing inheritance at every meta-level, and patterns and techniques for a fine-grain control of the meta-level of elements. Finally, we provide primitives to control the impedance mismatch when connecting models at different meta-levels.
Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: Abstract: Electrostatic Force Microscopy has been shown to be a useful tool to determine the dielectric constant of insulating films of nanometer thicknesses that play a key role in many electrical, optical and biological phenomena. Previous approaches make use of simple analytical formulae to analyse the experimental data for thin insulating films deposited directly on a metallic substrate. Here we show that the sensitivity of the EFM signal to changes in the dielectric constant of the thin film can be enhanced by using dielectric substrates with low dielectric constants. We present detailed numerical calculations of the tipsample electrostatic interaction in the following set-up: the insulating thin film, a dielectric substrate (or spacing layer) of known low dielectric constant and a metallic electrode. The EFM sensitivity to the dielectric constant increases with the thickness of the spacing layer and saturates for thicknesses above 100-300 nm, when it is close to that of an infinite medium.
El acceso a la versión del editor puede requerir la suscripción del recurso Access to the published version may require subscription Abstract. SKC is a prototype system for knowledge management in the Web by means of semantic information without supervision and tries to select the knowledge contained in the system by paying attention to its use. This paper explains user activity analysis in order to find out their interest for knowledge elements in the system, and the application of this interest for users classification and knowledge identification for their interest, inside and outside SKC. As a result a model for user interest based on interaction is obtained.
Modeling of User
El acceso a la versión del editor puede requerir la suscripción del recurso Access to the published version may require subscription Abstract. In this paper we present major results of a detailed study about the functionalities that are present in different collaborative systems, realized as collaborative components. We have used this study to establish a methodology for the automatic generation of collaborative applications supporting group needs. The methodology is directed to any community of end users, who do not need to have any programming skills.
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