In this paper, we investigate a system of twelve quaternion matrix equations. Using the real representation matrix, first derive least-squares solution with least norm to system. Meanwhile, establish solvability conditions and an expression general when it is consistent.

The group abstraction is a crucial element in the support provided by middleware platforms. Application areas such as CSCW, dependable systems or media dissemination can take advantage of groups to facilitate the communication and management of the several end-points participating in the application. Although there have been proposals for the provision of groups in CORBA and other middleware pl...

The Object Group Service (OGS) extends CORBA with the ability to group objects and invoke them as a single entity. Through this abstraction, OGS provides an adequate support for the construction of reliable and highly available distributed applications with replicated critical components. OGS was designed and implemented in accordance with the Object Management Group guidelines. It does not rel...

The Replication Logic is a set of protocols, mechanisms and services that allow a CORBA system to handle object replication. In this paper we present a specific implementation of a Replication Logic, namely Interoperable Replication Logic (IRL), which exhibits nice properties like non-intrusion (i.e., the replication logic is built “above” the ORB) and interoperability (i.e., a client can resid...