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Vocation
Enterprises Institution
Income(unit:yuan)
State-owned Private Education Civil servant
enterprise enterprise
High Low
Above 6000 Below 6000
Fig. 3. Concept hierarchy of 'In-
come'
Fig. 2. Concept hierarchy of 'Vocation'
Next we will illustrate the ability of multidimensional data model represents
prior knowledge from multiview and multilevel through an example. As the above
mentioned, we can evaluate the ability of a person from multiview, such as
'education', 'vocation', 'income', etc. And for each view, we can regard it from
multilevel by relying on our relevant prior knowledge.
We assume that prior knowledge about 'vocation' and 'income' be structured
as concept hierarchies illustrated as figure 2 and figure 3, respectively. Then
we will organize prior knowledge about 'education', 'vocation', and 'income'
as a multidimensional data model, which can used to evaluate a person from
multiview and multilevel.
For simplicity, we will denote those concepts in figure 1, figure 2 and fig-
ure 3 by some symbols. Such as denote 'education' by 'A', 'vocation' by 'B'
and 'income' by 'C'. The correspondence between concepts and symbols is as
follows.
'Education'
'A'
'High education'
'A1'
'Low education'
'A2'
'Doctoral student'
'A11'
'Postgraduate student'
'A12'
'A22'
where 'A11', 'A12', 'A21', 'A22' are specific concepts, and 'A1' is abstracted
from 'A11' and 'A12', 'A2' is abstracted from 'A21' and 'A22'.
'Vocation'
'Undergraduate'
'A21'
'Others'
'B'
'Enterprises'
'B1'
'Institution'
'B2'
'State-owned enterprise'
'B11'
'Private enterprise'
'B12'
'B22'
Similarly, 'B11', 'B12', 'B21', 'B22' are specific concepts, and 'B1' is abstracted
from 'B11' and 'B12', 'B2' is abstracted from 'B21' and 'B22'.
'Income'
'Education'
'B21'
'Civil servant'
'C'
'High income'
'C2'
The multidimensional data model is organized from the above three concept
hierarchies as figure 4, which can be used to evaluate a person from multiview
(education, vocation and income) and multilevel. For example, the shadow cell in
the data cube illustrated as figure 4 represents persons with high education, work
as a civil servant and have a high income. Each concept hierarchy corresponds
a dimension in figure 4.
'C1'
'Low income'
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