Download Conceptual Modeling - ER 2008: 27th International Conference by Oscar Pastor (auth.), Qing Li, Stefano Spaccapietra, Eric PDF

By Oscar Pastor (auth.), Qing Li, Stefano Spaccapietra, Eric Yu, Antoni Olivé (eds.)

This ebook constitutes the refereed lawsuits of the twenty seventh overseas convention on Conceptual Modeling, ER 2008, held in Barcelona, Spain, in October 2008.

The 33 revised complete papers provided including 18 demo papers have been conscientiously reviewed and chosen from 178 submissions. The papers are prepared in topical sections on novel semantics; ontology; styles; privateness, compliance, situation; strategy administration and layout; procedure versions; queries; similarity and coherence; area and time; method layout; translation, transformation, and search.

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Additional info for Conceptual Modeling - ER 2008: 27th International Conference on Conceptual Modeling, Barcelona, Spain, October 20-24, 2008. Proceedings

Example text

N}, we obtain (aii )3 as follows: Let x := max((aij )1 , (aij )2 ) and y := max((aji )1 , (aji )2 ). e. x ≤ y) (aji )3 := y and (aij )3 := max((aii )1 , (aii )2 ) − y. Note that the comparison x > y makes sure that the most dominant precedence in M1 and M2 is chosen as the output. In contrast, we can consider the less dominant precedence but it is common to both M1 and M2 . This becomes another operation called intersection defined as follows. Definition 7. (Intersection) The intersection of two POMs M1 and M2 , denoted as M1 ∩ M2 , is defined as a POM M3 over I such that (aii )3 := min((aii )1 , (aii )2 ) for all i ∈ {1, .

Definition 11. (Selection) The selection of a POM M1 , denoted as σθx (M1 ), where θ is a comparator such as >, <, ≥, ≤, or =, and x ∈ [0, 1] is a positive number, is defined as a POM M2 as follows: For all i ∈ {1, . . , n}(aii )2 = (aii )1 . (a )1 −(aji )1 | θx, then (aij )2 = (aij )1 ; For all distinct i, j ∈ {1, . . e. e. g. θ¯ is “≤” when θ is “>”). It follows from Definition 11 σ≥0 (M ) = M , where all entries are trivially selected. The result of “σ>1 (M )” represents the preference being reduced to the default order

Specifically, the adapted PIVOT algorithm runs in a quick-sort-like manner. In each recursion, a random pivot item xi is first selected and the following three band elements, UB > CB > LB , are also created for xi . Other items are then compared with the pivot xi .

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