= Elena Yudovina
{c}
<Elena Yudovina> is a <mathematician> whose work includes the theory of <stochastic networks>. With <Frank Kelly>, she wrote <Stochastic Networks by Frank Kelly and Elena Yudovina>, connecting <queueing theory>, <loss networks>, <congestion control> and distributed <optimization>. The author's book page verifies the joint authorship and 2014 publication.https://www.statslab.cam.ac.uk/~fpk1/BOOKS/sn.html[Author's book page: authors and publication record]{ref}
A central question is how local service or routing rules affect an entire network. The book's <M M 1 queue> illustrates the danger of operating near capacity: with arrival rate $\lambda$, service rate $\mu$ and $\rho=\lambda/\mu<1$, mean <queue population> is $\rho/(1-\rho)$. Modest changes in load can therefore cause large changes in delay.<Stochastic Networks by Frank Kelly and Elena Yudovina>[Section 2.1, M/M/1 equilibrium; overview of queueing, loss and congestion-control models]{ref}
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