This paper develops analytical expressions and algorithms for deriving the number of clusters that an average query of a given size and orientation retrieves using a given spatial access method. Besides being of theoretical interest, these algorithms run very fast and can be used by query...

This paper describes a simulation study investigating the performance of two non-recursive spatial clustering methods---the inverted naive and the spiral methods---in extensive detail and comparing them with the hilbert fractal method that has been shown in previous studies to outperform other...

Community source development has emerged as a new way of developing enterprise applications, leading to a unique type of open source development involving collaborative investment decisions by multiple institutional partners. A critical research question is what motivates partnering institutions...

Community-based open source, or “community sourceâ€, has emerged as an innovative approach to developing open-source enterprise application software (EAS). Unlike the conventional model of in-house development, community source creates a virtual software development community that pools...

Expert database systems combine database and expert systems technologies to support the effective management of both rules and data. This paper studies rule processing strategies in expert database systems involving rules that are conditional on joins of relational data. Auxiliary constructs for...