The Experts below are selected from a list of 149355 Experts worldwide ranked by ideXlab platform
Nitin H Vaidya - One of the best experts on this subject based on the ideXlab platform.
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iterative approximate byzantine consensus under a generalized Fault Model
arXiv: Distributed Parallel and Cluster Computing, 2012Co-Authors: Lewis Tseng, Nitin H VaidyaAbstract:In this work, we consider a generalized Fault Model that can be used to represent a wide range of failure scenarios, including correlated failures and non-uniform node reliabilities. This Fault Model is general in the sense that Fault Models studied in prior related work, such as f -total and f -local Models, are special cases of the generalized Fault Model. Under the generalized Fault Model, we explore iterative approximate Byzantine consensus (IABC) algorithms in arbitrary directed networks. We prove a necessary and sufficient condition for the existence of IABC algorithms. The use of the generalized Fault Model helps to gain a better understanding of IABC algorithms.
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iterative approximate byzantine consensus under a generalized Fault Model
International Conference of Distributed Computing and Networking, 2012Co-Authors: Lewis Tseng, Nitin H VaidyaAbstract:In this work, we consider a generalized Fault Model [7,9,5] that can be used to represent a wide range of failure scenarios, including correlated failures and non-uniform node reliabilities. Under the generalized Fault Model, we explore iterative approximate Byzantine consensus (IABC) algorithms [15] in arbitrary directed networks. We prove a tight necessary and sufficient condition on the underlying communication graph for the existence of IABC algorithms.
Lewis Tseng - One of the best experts on this subject based on the ideXlab platform.
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iterative approximate byzantine consensus under a generalized Fault Model
arXiv: Distributed Parallel and Cluster Computing, 2012Co-Authors: Lewis Tseng, Nitin H VaidyaAbstract:In this work, we consider a generalized Fault Model that can be used to represent a wide range of failure scenarios, including correlated failures and non-uniform node reliabilities. This Fault Model is general in the sense that Fault Models studied in prior related work, such as f -total and f -local Models, are special cases of the generalized Fault Model. Under the generalized Fault Model, we explore iterative approximate Byzantine consensus (IABC) algorithms in arbitrary directed networks. We prove a necessary and sufficient condition for the existence of IABC algorithms. The use of the generalized Fault Model helps to gain a better understanding of IABC algorithms.
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iterative approximate byzantine consensus under a generalized Fault Model
International Conference of Distributed Computing and Networking, 2012Co-Authors: Lewis Tseng, Nitin H VaidyaAbstract:In this work, we consider a generalized Fault Model [7,9,5] that can be used to represent a wide range of failure scenarios, including correlated failures and non-uniform node reliabilities. Under the generalized Fault Model, we explore iterative approximate Byzantine consensus (IABC) algorithms [15] in arbitrary directed networks. We prove a tight necessary and sufficient condition on the underlying communication graph for the existence of IABC algorithms.
Yuanfang Cheng - One of the best experts on this subject based on the ideXlab platform.
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shear flow coupling characteristics of a three dimensional discrete fracture network Fault Model considering stress induced aperture variations
Journal of Hydrology, 2019Co-Authors: Na Huang, Richeng Liu, Yujing Jiang, Yuanfang ChengAbstract:Abstract This study presents a three-dimensional discrete fracture network-Fault (3D DFN-Fault) Model that contains a 3D DFN and a deformable 3D Fault. The Fault slip-induced shear displacement and normal displacement are taken into account. Under a constant normal stiffness (CNS) boundary condition, the normal displacement gives rise to an increase in the normal stress and a decrease in the aperture of the fractures connected to the Fault, which are then incorporated into the Model. Finally, a numerical code is developed to simulate fluid flow through the 3D DFN-Fault Model during shearing and the effects of the aperture heterogeneity, shear displacement and fracture structure on the hydraulic properties of fractured rock masses are estimated. The results show that an obvious channeling flow in the fracture networks is observed as remarkable localizations of the flow paths within limited areas of fracture planes. The aperture heterogeneity of fractures tends to hinder the overall flow through the DFN-Fault Model during shearing. The equivalent permeability decreases at the beginning of shear because of the stress-induced closure of fractures. With increasing the shear displacement, the equivalent permeability of the Model in direction perpendicular to the Fault slip direction either increases or decreases, depending on the competition of two effects: (i) the permeability is enhanced by the shear-induced dilation of the Fault and the newly generated flow paths by connecting the dead-ends of fractures that are intersected to the Fault; (ii) the permeability decreases due to the closure of fractures, which is influenced by the increase in the dilation-dependent normal stress. However, as the shear displacement continuously increases, the equivalent permeability in the direction parallel to the Fault slip direction steadily increases.
Andrew J Michael - One of the best experts on this subject based on the ideXlab platform.
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stress orientations at intermediate angles to the san andreas Fault california
Journal of Geophysical Research, 2004Co-Authors: Jeanne L Hardebeck, Andrew J MichaelAbstract:[1] There are currently two competing Models for the frictional strength of the San Andreas Fault in California: the strong-Fault Model and the weak-Fault Model. The strong-Fault Model predicts the maximum horizontal compressive stress axis to be at low angles to the Fault, while the relatively weak Fault Model predicts it to be at high angles. Previous studies have disagreed as to which Model is supported by observed stress orientations. We review and compare these studies and present results from several new focal mechanism stress inversions. We find that the observed stress orientations of different studies are generally consistent, implying that the disagreement is one of interpretation. The majority of studies find compressive stress orientations at intermediate angles to the Fault, not strictly consistent with either current Model. The strong-Fault Model is acceptable if the San Andreas is assumed to be a nonoptimally orientated Fault that fails because optimally oriented, preexisting planes are not present. The relatively weak Fault Model is not consistent with the stress orientations. We propose two alternative Models to better explain the observed intermediate stress orientations: an intermediate-strength San Andreas Model and a Model in which all major active Faults are weak.
Wenbing Zhao - One of the best experts on this subject based on the ideXlab platform.
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byzantine Fault tolerance for services with commutative operations
IEEE International Conference on Services Computing, 2014Co-Authors: Hua Chai, Wenbing ZhaoAbstract:In this paper, we present a comprehensive study on how to achieve Byzantine Fault tolerance for services with commutative operations. Recent research suggests that services may be implemented using Conflict-free Replicated Data Types (CRDTs) for highly efficient optimistic replication with the crash-Fault Model. We extend such studies by adopting the Byzantine Fault Model, which encompasses crash Faults as well as malicious Faults. We carefully analyze the threats towards the operations in a system constructed with CRDTs, and propose a lightweight solution to achieve Byzantine Fault tolerance with low runtime overhead. We define a set of correctness properties for such systems and prove that the proposed Byzantine Fault tolerance mechanisms guarantee these properties. Furthermore, we show that our mechanisms exhibit excellent performance with a proof-of-concept replicated shopping cart service constructed using CRDTs.
