To completely address database integration problems in the context of multidatabase and data warehousing systems, one has to examine various integration and query requirements. In this paper, we identify three phases of database integration, i.e. analysis, derivation, and evolution. Due to poor data quality in local databases and local database updates, some unresolved instance connicts have to...

The phase-based approach to grammatical derivation and one rooted in the Tree Adjoining Grammar (TAG) formalism share the idea that the derivation of a complex sentence is divided into separate derivations of local domains. These approaches differ, however, in their treatment of syntactic dependencies spanning across such local domains. Under the phase approach, operations in a higher domain ca...

We prove that in a ring Rwith an identity there exists an element a ∈ R and a nonzero derivation d ∈ Der R such that ad(a) 6= 0. A ring R is said to be a d-rigid ring for some derivation d ∈ Der R if d(a) = 0 or ad(a) 6= 0 for all a ∈ R. We study rings with rigid derivations and establish that a commutative Artinian ring R either has a non-rigid derivation or R = R1 ⊕ · · · ⊕ Rn is a ring direc...

Motivated by the research on social opinion dynamics over large networks, a general framework for verifying the Monotonicity Property of multi-agent dynamics is introduced. This allows a derivation of sociologically meaningful sufficient conditions for monotonicity that are tailor-made for social opinion dynamics, which typically have high non-linearity. A key part of this framework is the defi...

The derivation of a local mobility model for symmetrical ultra-thin DGSOI nMOSFETs is outlined. A local-field variant is found to reproduce the dependencies of the quantummechanical mobility on silicon slab thickness and normal field with a maximum error of 10%. The model can be used with the density-gradient approach.