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In-Depth Information
integrating the existing ES (or DBS) to form an EDS. The users can also reengineer
an existing ES and DBS by integrating them into an EDS.
The technique to integrate an ES and a DBS is to form a common frame model
metadata for both of them. This frame model metadata acts as an object-oriented-
like database. It takes each Frame model metadata as a class that consists of class
name, static attribute, dynamic methods and constraints. These frame model meta-
data form coupling classes that extract data from the source DBS, or rules from the
source ES. To resolve the naming conflict between the source ES and the source
DBS, an integrated class is formed to link them together by using a set of common
names for their attributes (i.e., resolve naming conflict). With the integrated classes,
the source ES, source DBS, and coupling class (in static or active class forms) can
pass information via messages to each other. The resultant EDS thus becomes a
knowledge base because it consists of both ES and DBS information, and the ap-
plication knowledge from the users after analysis. System developer can then use
the EDS to develop new applications.
Questions
Question 8.1
The EC countries supply food to Russia in 1991 to aid the Russian people for the
forthcoming winter months. The EC countries set several demand centers, one at
each Russian state, and some distribution centers and warehouses in different loca-
tions within the EC countries to organize the food distribution. The orders are filled
either by regional distribution centers, which are set up to ship out orders immedi-
ately upon request, or by supply warehouses, which supply the inventory for distribu-
tion centers. The centre table and the transportation expert system rule is as follows:
Center database table:
Field-Name Type Width Dec
Centre-Name
Characte 10
Food-Type
Character 20
Distance
Number 12
Food-Name
Character 30
Quantity
Number 5
2
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