34,495 research outputs found
Securely Outsourcing Large Scale Eigen Value Problem to Public Cloud
Cloud computing enables clients with limited computational power to
economically outsource their large scale computations to a public cloud with
huge computational power. Cloud has the massive storage, computational power
and software which can be used by clients for reducing their computational
overhead and storage limitation. But in case of outsourcing, privacy of
client's confidential data must be maintained. We have designed a protocol for
outsourcing large scale Eigen value problem to a malicious cloud which provides
input/output data security, result verifiability and client's efficiency. As
the direct computation method to find all eigenvectors is computationally
expensive for large dimensionality, we have used power iterative method for
finding the largest Eigen value and the corresponding Eigen vector of a matrix.
For protecting the privacy, some transformations are applied to the input
matrix to get encrypted matrix which is sent to the cloud and then decrypting
the result that is returned from the cloud for getting the correct solution of
Eigen value problem. We have also proposed result verification mechanism for
detecting robust cheating and provided theoretical analysis and experimental
result that describes high-efficiency, correctness, security and robust
cheating resistance of the proposed protocol
Quasinormal frequencies and thermodynamic quantities for the Lifshitz black holes
We find the connection between thermodynamic quantities and quasinormal
frequencies in Lifshitz black holes. It is shown that the globally stable
Lifshitz black holes have pure imaginary quasinormal frequencies. We also show
that by employing the Maggiore's method, both the horizon area and the entropy
can be quantized for these black holes.Comment: 21 pages, no figures, version to appear in PR
Cognitively Engineering a Virtual Collaboration Environment for Crisis Response
Crisis response situations require collaboration across many different organizations with different backgrounds, training, procedures, and goals. The Indian Ocean Tsunami in 2004 and the Hurricane Katrina relief efforts in 2005 emphasized the importance of effective communication and collaboration. In the former, the Multinational Planning Augmentation Team (MPAT) supported brokering of requests for assistance with offers of help from rapidly deployed military and humanitarian assistance facilities. In the aftermath of Hurricane Katrina, the National Guard Soldiers and active component Army Soldiers assisted other state, federal, and non-government organizations with varying degrees of efficiency and expediency. Compounding the challenges associated with collaboration during crisis situations is the distributed nature of the supporting organizations and the lack of a designated leader across these military, government, nongovernment organizations. The Army Research Laboratory is collaborating with the University of Edinburgh, University o
X-ray Raman compression via two-stream instability in dense plasmas
A Raman compression scheme suitable for x-rays, where the Langmuir wave is
created by an intense beam rather than the pondermotive potential between the
seed and pump pulses, is proposed.
The required intensity of the seed and pump pulses enabling the compression
could be mitigated by more than a factor of 100, compared to conventionally
available other Raman compression schemes. The relevant wavelength of x-rays
ranges from 1 to 10 nm
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