Query folding is a technique for determining how a query may be answered using a given set of resources, which may include materialized views, cached results of previous queries, or queries answerable by other databases. The power of query folding can be considerably enhanced by taking into account integrity constraints that are known to hold on base relations. This paper describes an extension...

Database replication protocols check read-write and/or write-write conflicts. If there are none, then protocols propagate transactions to the database, assuming they will eventually commit. But commitment may fail due to integrity constraints violations. Also, the read actions of integrity checking may give raise to new conflicts. Thus, some more care must be taken if, in addition to the consis...

Assuring that system files have not been tampered with over time is a vital, but oftoverlooked, aspect of system security. File integrity checkers provide ways to assure the validity of files on a system. This paper concerns itself with a review of file integrity checkers. It pays particular attention to what the minimum requirements for an integrity checker are, the different approaches taken ...

This paper presents a solution to check referential integrity constraints and conjunctive global constraints in a relational multi database system. It also presents the experimental results obtained by implementing this solution over a PC cluster with Oracle9i DBMS. The goal of those experimentations is to measure the time spent to check global constraints in a distributed systems. The results ...

Optical coherence tomography (OCT) is an optical acquisition method to examine biological tissues. In recent years, OCT has become an important imaging technology used in diagnosing and following macular pathologies. Further development enabled application of optical coherence tomography in evaluation of the integrity of the nerve fiber layer, optic nerve cupping, anterior chamber angle, or cor...

OBJECTIVE Myelination of the human brain results in roughly quadratic trajectories of myelin content and integrity, reaching a maximum in mid-life and then declining in older age. This trajectory is most evident in vulnerable later myelinating association regions such as frontal lobes and may be the biological substrate for similar trajectories of cognitive processing speed. Speed of movement, ...

The paper describes the development of a comprehensive decision logic for selection and use of biological and chemical protective clothing (BCPC). The decision logic recognizes the separate areas of BCPC use among emergency, biological, and chemical hazards. The proposed decision logic provides a system for type classifying BCPC in terms of its compliance with existing standards (for emergency ...