We rigorously analyze Knill’s Fibonacci scheme for fault-tolerant quantum computation, which is based on the recursive preparation of Bell states protected by a concatenated error-detecting code. We prove lower bounds on the threshold fault rate of 0.67 10−3 for adversarial local stochastic noise, and 1.25 10−3 for independent depolarizing noise. In contrast to other schemes with comparable pro...

LOCKSS (Lots Of Copies Keep Stuff Safe) is a prototype of a system to preserve access to scientific journals published on the Web. It is a majority-voting fault-tolerant system that, unlike normal systems, has far more replicas than would be required just to survive the anticipated failures. We are exploring techniques that exploit the surplus of replicas to permit a much looser form of coordin...

The effect of near-fault ground displacement is a significant factor when structures straddle a fault, because the fault produces both static step-like deformations and dynamic pulse-like ground motions. It has been observed that the static displacements measured up to 10 m and strong ground motion velocity pulses exceed 100 cm/s. As there is no concrete method for the seismic design of near-fa...

This thesis deals with the problem of obtaining meaningful and comparable dependability measures of software through the method of fault-injection. The thesis is specifically dedicated to safety-critical embedded software and its dependability property ‘fault-tolerance’ with respect to random faults affecting the machine instruction execution. For enabling comparability of the faulttolerance of...

Historical masonry arch bridges which might be vulnerable to natural disasters are important part of the cultural heritage. Natural disasters, especially earthquakes can inflict damage these structural systems. This paper aims investigate a comparison effects near and far-fault ground motions on seismic response under different earthquakes. Kalender bridge is located in Ergani, Turkey selected ...

We propose a deterministic fault-tolerant and deadlock-free routing protocol in 2-dimensional (2-D) meshes based on Wu’s fault-tolerant odd–even turn model and Wang’s rectilinear-monotone polygonal fault block model. The fault-tolerant odd–even turn protocol, also called extended X–Y routing, was originally proposed to achieve fault-tolerant and deadlock-free routing among traditional, rectangu...

To estimate the fault dimension of an earthquake in real time, we present a methodology to classify seismic records into near-source or far-source records. Characteristics of ground motion, such as peak ground acceleration, have a strong correlation with the distance from a fault rupture for large earthquakes. This study analyzes peak ground motions and finds the function that best classifies n...