There is currently great interest in building information mediators that can integrate information from multiple data sources such as databases or Web sources. The query response time in such mediators is typically quite high. We present an approach for optimizing the performance of information mediators by selectively materializing data. We first present our overall framework for materializati...

The virtual data model allows data sets to be described prior to, and separately from, their physical materialization. We have implemented this model in a Virtual Data Language (VDL) and associated supporting tools, which provide for both the storage, query, and retrieval of virtual data set descriptions, and the automated, on-demand materialization of virtual data sets. We use a standardized d...

The construction industry plays a pivotal role in energy conservation and emission reduction. Therefore, it is of great significance to conduct research on quantifying carbon emissions this accelerate the establishment standardized accounting system achieve goals peak neutrality. In study, focus building materialization stage, established using factor method. This applied calculate 15 residenti...

Knowledge graphs are often constructed from heterogeneous data sources, using declarative rules that map them to a target ontology and materializing into RDF. When these sources large, the materialization of entire knowledge graph may be computationally expensive not suitable for those cases where rapid is required. In this work, we propose an approach overcome limitation, based on novel concep...

The enhancement in the decay rate of the Kaluza-Klein vacuum due to the presence of a brane is studied, both in the test brane approximation and beyond it. Spontaneous brane materialization in the Kaluza-Klein vacuum is also described.

Data integration systems are planned to offer uniform access to data from heterogeneous and distributed sources. Two classical data integration architectures have been proposed in the literature. In the materialized approach, data are stored, integrated and accessed directly from a data warehouse. In the virtual approach, the queries posed to the integration system are decomposed into queries a...