UNIK-RELAX: A generator of the Lagrangian problem and its application to the distributed database system

Abstract

In the integer programming model, structural identification and relaxation is an approach that generates the Lagrangian problem of the model. The approach is based on a semantic view which specifies the optimization model in a formal knowledge representation such as frames. We have developed a system, UNIK-RELAX, that implements the approach on the knowledge-assisted optimization modeler; UNIK-OPT, and forward chaining rule based system, UNIK-FWD. This paper particularly elaborates three states: The model distinctiveness state, embedded structure state and Lagrangian structure state which occurred in the process of generating the Lagrangian problem. The system UNIK-RELAX is applied to a data allocation model. (C) 1997 Elsevier Science Ltd.