fault tolerance

Construction of All Minimal Edge Extensions of the Graph with Isomorphism Rejection

Authors: Abrosimov M. B., Lobov A. A., Sudani H. H.

In 1993 Frank Harary and John P. Hayes proposed a graph model for investigating edge fault tolerance of discrete systems. The technical system is mapped to a graph. The elements of the system correspond to the vertices of the graph, and links between the elements correspond to edges or arcs of the graph. Failure of a system element refers to the removal of the corresponding vertex from the system graph along with all its edges. The formalization of a fault tolerant system implementation is the extension of the graph.

Characterization of graphs with a small number of additional arcs in a minimal 1-vertex extension

Authors: Abrosimov M. B.

A graph G∗ is a k-vertex extension of a graph G if every graph obtained from G∗ by removing any k vertices contains G. k-vertex extension of a graph G with n+k vertices is called minimal if among all k-vertex extensions of G withn+k vertices it has the minimal possible number of arcs. We study directed graphs, whose minimal vertex 1-extensions have a specific number of additional arcs. A solution is given when the number of additional arcs equals one or two.