In this paper, we design and implement a prototypical heterogeneous distributed database system, named DHIM (Distributed Heterogeneous Information Management). The objectives of DHIM are two-fold: one is to realize the global update synchronization mechanism which preserve the global serializability of concurrent executions and the local site autonomy in tightly coupled heterogeneous distribute...

In this paper, we consider the problem of estimating time-dependent ability workers participating in distributed matrix-vector multiplication over heterogeneous clusters. Specifically, model workers’ as a latent variable and introduce log-normally working rate function with parameters so that increases increases, takes positive values only. This modeling is motivated by need to reflect impact e...

Knowledge-based integrated information systems (KBIIS) denote a class of systems that involve the integration of heterogeneous information resources. These information resources may include heterogeneous distributed database systems, knowledge-based systems (such as expert systems) involving heterogeneous knowledge representations, and conventional application programs and their associated proc...