System Reliability Assessment Based on Failure Propagation Processes

Table 3

The measures of nodes.

Measure	Equation	Notation
Degree centrality (DC)		.
Closeness centrality (CC)		is the shortest path length between nodes and .
Betweenness centrality (BC)		is the total number of shortest paths from node to node , and is the number of those paths that pass through node .
The probability of failure		is the number of failures of node ; is the total operating time of node.
MTBF		is theth start of downtime of node ; is the th start of uptime of node .
Service life		is the start time of node , is the end time of node .