Displaying similar documents to “Integrity constraints in distributed databases.”

Small towns in peripheral regions of Germany

Manfred Kühn (2015)

Annales Universitatis Paedagogicae Cracoviensis Studia Geographica

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The paper summarizes the main findings of a study on small towns in peripheral locations in Germany. In its first part, the results of the data analysis are presented and the spatial distribution of shrinking and growing small towns in Germany is described. The majority of them in peripheral areas are currently shrinking, which includes an assemblage of demographic, economic, infrastructural and fiscal problems, leading to a danger of a negative downward spiral. The second part deals...

Optimal Allocation of Renewable Energy Parks: A Two–stage Optimization Model

Carmen Gervet, Mohammad Atef (2013)

RAIRO - Operations Research - Recherche Opérationnelle

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Applied research into Renewable Energies raises complex challenges of a technological, economical or political nature. In this paper, we address the techno−economical optimization problem of selecting locations of wind and solar Parks to be built in Egypt, such that the electricity demand is satisfied at minimal costs. Ultimately, our goal is to build a decision support tool that will provide private and governmental investors into renewable energy systems, valuable insights to make...

Versioning of Granulated Data in Hierarchically Composed Workspaces

Jotov, Vladimir (2013)

Serdica Journal of Computing

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ACM Computing Classification System (1998): F.4.1. For the last 30 years there has been a lot of research of versioned software products, but challenges remain nevertheless. This article focuses on a model of versioned objects and hierarchically composed workspaces. The presented model of versioned object aims to solve the issue of granulation of versioned data. The model of hierarchically composed workspaces provides methods and rules for versioning, which complete the first...