15 research outputs found
A dissemination strategy for immunizing scale-free networks
We consider the problem of distributing a vaccine for immunizing a scale-free
network against a given virus or worm. We introduce a new method, based on
vaccine dissemination, that seems to reflect more accurately what is expected
to occur in real-world networks. Also, since the dissemination is performed
using only local information, the method can be easily employed in practice.
Using a random-graph framework, we analyze our method both mathematically and
by means of simulations. We demonstrate its efficacy regarding the trade-off
between the expected number of nodes that receive the vaccine and the network's
resulting vulnerability to develop an epidemic as the virus or worm attempts to
infect one of its nodes. For some scenarios, the new method is seen to render
the network practically invulnerable to attacks while requiring only a small
fraction of the nodes to receive the vaccine
Stretchable Silver Nanowire–Elastomer Composite Microelectrodes with Tailored Electrical Properties
We
introduce a photolithography process compatible with soft and
rigid substrates, enabling the fabrication of complex 3D interconnected
patterns of silver nanowire (AgNW) networks embedded in polydimethylsiloxane
(PDMS). Dimensions of the AgNW micropatterns are controlled within
the film plane by photolithography, whereas thickness is controlled
via a novel and uniform deposition technique using centrifugation.
We report the first systematic characterization of the electromechanical
properties of such microelectrodes with finest stretchable feature
of 15 ÎĽm. We observe a geometry-dependent behavior of the gauge
factor not only by changing the thickness of the microelectrodes,
as it has been commonly reported so far, but also by varying their
lateral dimensions. The presented nanocomposites exhibited sheet resistances
down to 0.6 Ω/sq, gauge factors ranging from 0.01 to 100, and
stretchability above 50% uniaxial strain. This versatile process allows
for the production of highly sensitive strain sensors and robust high-density
stretchable conductors on a wafer scale with direct implications in
mass production of stretchable electronic devices