A Database for Galaxy Evolution Modeling

A Database Model for Medical Consultation

The database model presented in this paper is suitable for application in which queries may require non-crisp references to certain attributes. The data item (attribute) values may be crisp or fuzzy. For instance, such adjectives as 'high' or 'normal' may be attribute values for the attribute blood pressure. A disease or a condition can be described by a number of symptoms which may be crisp al...

Galaxy Evolution

Galaxy Evolution from Halo Occupation Distribution Modeling of Deep2 and Sdss Galaxy Clustering

We model the luminosity-dependent projected two-point correlation function of DEEP2 and SDSS galaxies within the Halo Occupation Distribution (HOD) framework. From this we infer the relationship between galaxy luminosity and host dark matter halo mass at z ∼ 1 and at z ∼ 0. At both epochs, there is a tight correlation between central galaxy luminosity and halo mass, with the slope and scatter d...

Need for a citation database of medical literature in Iran

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A Framework for Database Evolution Management

This paper addresses the crucial problem of changes and evolution in the context of database systems. We argue that the importance of change depends primarily on its nature. The nature of change impacts one or several phases of the database life-cycle. We propose a typology of changes based on three dimensions, namely the nature, the significance, and the time frame. These dimensions enable us ...