Information Technology Reference
In-Depth Information
Accordingly with the specified use case diagram, the respective structural model
was constructed through a UML class diagram described in Figure 3, indicating only
the classes and the associative relationships.
The Main class is associated with all classes through aggregation relationships one-
to-one or one-to-many relationships. The latest are GOP and PPI classes.
From the class diagram, the respective relational database model was obtained by
applying the standard conversion rules according to [7]. The final outcome with the
relational diagram for the new system is in Figure 4.
Fig. 4. Relational database diagram created for the new system
3
System Development
The software tools chosen for the system implementation are all Open Source. The
choice for Open-Source was mainly due to economic reasons, and the knowledge of
technology, compared to other proprietary solutions ( e.g. Microsoft). In spite of this,
it is important to note that these applications have features, such as a PHP class, that
allows running R scripts that is paramount in the construction of this type of systems.
The following technologies have been used:
MySQL Database Manager.
PHP programming language
A Linux server properly configured to interact with a Microsoft SQL Server
2008, where the data are stored.
R software for creating time series and predictive models.
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