Ilze Ziedins
The University of Auckland



When networks go bad....


Does adding extra capacity to networks reduce congestion?
Not always.  Sometimes adding extra capacity at nodes
or on links, or even adding extra routes or links, can
lead to greater delays and worse performance.  This
has implications for both transportation networks and
computer networks.  This talk will give examples of
such paradoxical behaviour, and discuss why it happens.
The discussion will be in the context of queueing
networks, with some reference to game theoretic ideas.