| Popis: |
The article presents the method of the comparative evaluation of centralization systems based on the graph theory using the adjacency matrices and graph distance matrix of the system structure. For these matrices, the coefficient of structural redundancy, the coefficient of structural compactness, the number of the principal contours of the connected graph and the degree of the structure centralization of the control system are calculated. The obtained indicators make it possible to analyze the structures of the control systems and to draw conclusions regarding their quality properties, in particular safety. The unfolded explanation is given describing how the basic properties of the system showing its functional operability are presented in the graph structure. It also explains the connection between the structure elements and the hierarchy levels of the microprocessor centralization of the control system with the number and spatial location of knots, their distribution on correspondent groups according to levels. In accordance with the connection lines between subsections and elements, the number and location of arcs constructing a graph are determined. As a practical application of the offered method, the example of the comparison of two wide-spread systems of the microprocessor centralization, namely, “Impuls” and “Ebilock-950” systems, is given. It enables structurally to unify and on the system level to integrate railway specialized computer systems. The results of the research presented in the article are intended for specialists in the field of development and research of railway control systems. |
