Brainstem death is a clinical syndrome defined by the absence of reflexes with pathways through the brainstemâthe stalk of the brain, which connects the spinal cord to the mid-brain, cerebellum and cerebral hemispheresâin a deeply comatose, ventilator-dependent patient. Identification of this state carries a very grave prognosis for survival; cessation of heartbeat often occurs within a few days although it may continue for weeks or even months if intensive support is maintained. In ...
Collecting the Traffic Demand Matrices. The core traffic demand matrix is the matrix of ingress-to-egress traffic demands across the core network. Traffic matrices can be measured or estimated to different levels of aggregation: by IP prefix, by router, by point of presence (POP), or by autonomous system (AS).
Adjacency matrix (vertex matrix) Graphs can be very complicated. We can associate a matrix with each graph storing some of the information about the graph in that matrix. This matrix can be used to obtain more detailed information about the graph. If a graph has vertices, we may associate an matrix which is called vertex matrix or adjacency matrix.