We deployed a dense linear array of 45 seismometers across and along the San Andreas fault near Parkfield a week after the M 6.0 Parkfield earthquake on 28 September 2004 to record fault-zone seismic waves generated by aftershocks and explosions. Seismic stations and explosions were co-sited with our previous experiment conducted in 2002. The data from repeated shots detonated in the fall of 20...

As cloud computing is increasingly expanding its application scenario, it is vital for cloud storage customers not to sacrifice the confidentiality of sensitive data while making fullest use of operational functionality of cloud secure systems. Although traditional searchable encryption can well solve exact keyword search on encrypted data with retrieving files by search interest, it does not w...

Let P be a set of points in the plane, each equipped with a directional antenna that covers a sector of angle α and range r. In the symmetric model of communication, two antennas u and v can communicate to each other, if and only if v lies in u’s coverage area and vice versa. In this paper, we introduce the concept of fault-tolerant spanners for directional antennas, which enables us to constru...

Proof: We present here only a sketch of the proof. Consider a symmetric maximal-pool system X m (DB), and a single-paging 1 system with a buffer-pool of size m and a buffer replacement policy that is the same as that of the symmetric system. Let F(s,m) denote the number of faults experienced by the single-paging system when it encounters a reference string s. We can show that X m (DB) preserves...

This note discusses a class of large-scale systems composed of symmetrically interconnected identical subsystems. We consider the decentralized H1 control design problem and study the fault tolerance of the resulting system. By exploiting the special structure of the systems, a sufficient condition for the existence of a decentralized H1 controller is derived. Moreover, for the nominal case as ...

For any robotic system, fault tolerance is a desirable property. This work uses a comparative approach to investigate fault tolerance and the associated problem of reduced manipulability of robots. An important result in combinatorial matrix theory is first obtained. Its consequent modifications are then applied to the theory of fault tolerance of robotic manipulators. It is shown that for a ce...

We consider a three-dimensional elastic body with a plane fault under a slip-weakening friction. The fault has -periodically distributed holes, called (smallscale) barriers. This problem arises in the modeling of the earthquake nucleation on a large-scale fault. In each -square of the -lattice on the fault plane, the friction contact is considered outside an open set T (small-scale barrier) of ...

The demountable disk-drum aero-engine rotor is an important piece of equipment that greatly impacts the safe operation of aircraft. However, assembly looseness or crack fault has led to several unscheduled breakdowns and serious accidents. Thus, condition monitoring and fault diagnosis technique are required for identifying abnormal conditions. Customized ensemble multiwavelet method for aero-e...

This paper introduces the problem of fault tolerant topology control for one-to-all communications in symmetric wireless networks. We investigate two algorithms to address the problem, namely Minimum Weight Based Algorithm (MWBA) and Nearest Neighbor Augmentation Algorithm (NNAA), and prove that the former is a 4k approximation and the latter is a (k+4) approximation. Through simulations, we ev...