7,573 research outputs found
DCDIDP: A Distributed, Collaborative, and Data-driven IDP Framework for the Cloud
Recent advances in distributed computing, grid computing, virtualization mechanisms, and utility computing led into Cloud Computing as one of the industry buzz words of our decade. As the popularity of the services provided in the cloud environment grows exponentially, the exploitation of possible vulnerabilities grows with the same pace. Intrusion Detection and Prevention Systems (IDPSs) are one of the most popular tools among the front line fundamental tools to defend the computation and communication infrastructures from the intruders. In this poster, we propose a distributed, collaborative, and data-driven IDP (DCDIDP) framework for cloud computing environments. Both cloud providers and cloud customers will benefit significantly from DCDIDP that dynamically evolves and gradually mobilizes the resources in the cloud as suspicion about attacks increases. Such system will provide homogeneous IDPS for all the cloud providers that collaborate distributively. It will respond to the attacks, by collaborating with other peers and in a distributed manner, as near as possible to attack sources and at different levels of operations (e.g. network, host, VM). We present the DCDIDP framework and explain its components. However, further explanation is part of our ongoing work
Markovian evolution of strongly coupled harmonic oscillators
We investigate how to model Markovian evolution of coupled harmonic
oscillators, each of them interacting with a local environment. When the
coupling between the oscillators is weak, dissipation may be modeled using
local Lindblad terms for each of the oscillators in the master equation, as is
commonly done. When the coupling between oscillators is strong, this model may
become invalid. We derive a master equation for two coupled harmonic
oscillators which are subject to individual heat baths modeled by a collection
of harmonic oscillators, and show that this master equation in general contains
non-local Lindblad terms. We compare the resulting time evolution with that
obtained for dissipation through local Lindblad terms for each individual
oscillator, and show that the evolution is different in the two cases. In
particular, the two descriptions give different predictions for the steady
state and for the entanglement between strongly coupled oscillators. This shows
that when describing strongly coupled harmonic oscillators, one must take great
care in how dissipation is modeled, and that a description using local Lindblad
terms may fail. This may be particularly relevant when attempting to generate
entangled states of strongly coupled quantum systems.Comment: 11 pages, 4 figures, significantly revised and close to the published
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