1,279 research outputs found
A flexible mandatory access control policy for XML databases
A flexible mandatory access control policy (MAC) for XML
databases is presented in this paper. The label type and label
access policy can be defined according to the requirements of
applications. In order to preserve the integrity of data in XML
databases, a constraint between a read access rule and a write
access rule in label access policy is introduced. Rules for label
assignment and propagation are proposed to alleviate the
workload of label assignment. Also, a solution for resolving
conflicts of label assignments is proposed. At last, operations for
implementation of the MAC policy in a XML database are
illustrated
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A practical mandatory access control model for XML databases
A practical mandatory access control (MAC) model for XML databases is presented in this paper. The
label type and label access policy can be defined according to the requirements of different applications. In order to
preserve the integrity of data in XML databases, a constraint between a read-access rule and a write-access rule in
label access policy is introduced. Rules for label assignment and propagation are presented to alleviate the workload
of label assignments. Furthermore, a solution for resolving conflicts in label assignments is proposed. Rules for
update-related operations, rules for exceptional privileges of ordinary users and the administrator are also proposed
to preserve the security of operations in XML databases. The MAC model, we proposed in this study, has been
implemented in an XML database. Test results demonstrated that our approach provides rational and scalable
performance
A Quantum Convolutional Neural Network for Image Classification
Artificial neural networks have achieved great success in many fields ranging
from image recognition to video understanding. However, its high requirements
for computing and memory resources have limited further development on
processing big data with high dimensions. In recent years, advances in quantum
computing show that building neural networks on quantum processors is a
potential solution to this problem. In this paper, we propose a novel neural
network model named Quantum Convolutional Neural Network (QCNN), aiming at
utilizing the computing power of quantum systems to accelerate classical
machine learning tasks. The designed QCNN is based on implementable quantum
circuits and has a similar structure as classical convolutional neural
networks. Numerical simulation results on the MNIST dataset demonstrate the
effectiveness of our model.Comment: 7 pages, 7 figure
D-type Minimal Conformal Matter: Quantum Curves, Elliptic Garnier Systems, and the 5d Descendants
We study the quantization of the 6d Seiberg-Witten curve for D-type minimal
conformal matter theories compactified on a two-torus. The quantized 6d curve
turns out to be a difference equation established via introducing codimension
two and four surface defects. We show that, in the Nekrasov-Shatashvili limit,
the 6d partition function with insertions of codimension two and four defects
serve as the eigenfunction and eigenvalues of the difference equation,
respectively. We further identify the quantum curve of D-type minimal conformal
matters with an elliptic Garnier system recently studied in the integrability
community. At last, as a concrete consequence of our elliptic quantum curve, we
study its RG flows to obtain various quantum curves of 5d theories.Comment: 36+6 page
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