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Brian Noble

Publications and source records attributed to Brian Noble.

2 recordsLinked to original sources
arXiv2020

BumbleBee: Application-aware adaptation for container orchestration

Modern applications have embraced separation of concerns as a first-order organizing principle through the use of containers, container orchestration, and service meshes. However, adaptation to unexpected network variation has not followed suit. We present BumbleBee, a lightweight extension to the container ecosystem that supports application-aware adaptation. BumbleBee provides a simple abstraction for making decisions about network data using application semantics. Because this abstraction is placed within the communications framework of a modern service mesh, it is closer to the point at which changes are detected, providing more responsive and effective adaptation than possible at endpoints.

cs.DC↗
arXiv2018

A distributed electrical model for superconducting nanowire single photon detectors

To analyze the switching dynamics and output performance of a superconducting nanowire single photon detector (SNSPD), the nanowire is usually modelled as an inductor in series with a time-varying resistor induced by absorption of a photon. Our recent experimental results show that, due to the effect of kinetic inductance, for a SNSPD made of a nanowire of sufficient length, its geometry length can be comparable to or even longer than the effective wavelength of frequencies contained in the output pulse. In other words, a superconducting nanowire can behave as a distributed transmission line so that the readout pulse depends on the photon detection location and the transmission line properties of the nanowire. Here, we develop a distributed model for a superconducting nanowire and apply it to simulate the output performance of a long nanowire designed into a coplanar waveguide. We compare this coplanar waveguide geometry to a conventional meander nanowire geometry. The simulation results agree well with our experimental observations. With this distributed model, we discussed the importance of microwave design of a nanowire and how impedance matching can affect the output pulse shape. We also discuss how the distributed model affects the growth and decay of the photon-triggered resistive hotspot.

physics.app-ph↗