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Unformatted text preview: re there vulnerabilities? What are the weakest links?
How to slow down virus propagation?
How to design marketing/political campaigns?
Who is the most influential blogger out there? MA/CS109 (Azer Bestavros) ? … whose behaviors and properties we need to
understand and make statements about! Let’s take an example 4/26/2010 2 I can “imagine” a model of how such networks may
form… 5 4/26/2010 MA/CS109 (Azer Bestavros) 6 Attempt #1: Edges at Random What do we get? [demo] 1. Pick the size of the graph you want – i.e., the
number of nodes n you want 2. Pick the average number of neighbors (degree)
for a node d 3. For every pair of nodes in the graph – roll the
dice and with probability ~ d/n establish an edge
between the pair of nodes
“ER” Model due to ErdosRenyi (circa 1959)
MA/CS109 (Azer Bestavros) 4/26/2010 7 Observations for ER Graphs 4/26/2010 MA/CS109 (Azer Bestavros) 8 Attempt #2: Radom Attachment Graph disconnected when d < 1 and very “quickly”
gets connected when d > 1 1. In the beginning...
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This note was uploaded on 02/10/2014 for the course CS 109 taught by Professor Azerbestavros during the Spring '13 term at BU.
 Spring '13
 AzerBestavros

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