With disk-instability model and starburst model, AGN optical variability and spectral slope variability in the B and V bands are simulated and compared with observations.

An Association Rules Mining Method Based on Star Schema;

The Tool for Interactive Construction and Implemention of a star schema will offer a web-based user interface to design a data warehouse star schema from the schemas of some existing operational database.

But the corrective and natural changing of dimensional tables based on star schema make the aggregate data false.

Aimed at a typical application of data warehouse,an algorithm is proposed which utilizes key attribute index as HASH variable to construct star model of data warehouse.

The star model method proposed in this paper make use of the features that different context vales in the same context type have functional relation to perform context translation which can extremely reduce the amount of pre-definition translation rules and gain better flexibility,extensibility and maintainability.

In order to get rid of these shortcomings, a new detonation model, named as conjugate detonation model, has been established, in which thermodynamic equilibrium state is taken as the final state of detonation process.