Three approximate switching algorithms for trajectory surface hopping calculations are presented using simple models to describe the dependence of the hopping probability on the nonadiabatic coupling strength. The switching algorithms are applied to the calculation of the electronic deexcitation in ethylene, methaniminium ion and trans-azobenzene. Compared with the results from the standard few...

File replication for uninterrupted availability is affected by the localised nature of network failures, particularly in ubiquitous, mobile environments; nearby nodes often get disconnected together, as a result of switching equipment faults, or of local wireless network unavailability – for instance, failure of a base station, or loss of network connectivity when a train enters a tunnel. In th...

The ingress and egress nodes in an all-optical network have an electronic inand egress part and an optical switch. This work analyses various architectures for interconnection of the "electronic" and "optical" parts of the network in order to tolerate single optical switch failures and single optical link failures. The architectures studied are: non-redundant (reference), fault tolerant optical...

Following that, we show how the Multiple Models, Switching and Tuning (MMST) methodology can be applied in the context of Failure Detection, Identification and Reconfiguration (FDIR), and discuss its stability and convergence properties. Multiple Model Predictive Control (MMPC) approach is presented and discussed in the case of lock-in-place control actuator failures. Combining the on-line FDI ...

In a wavelength-division-muliplexing (WDM) optical network, the failure of network elements (e.g., fiber links and cross connects) may cause the failure of several optical channels, thereby leading to large data losses. This study examines different approaches to protect a mesh-based WDM optical network from such failures. These approaches are based on two survivability paradigms: 1) path prote...

Abstract: This paper focuses on the problem of guaranteed cost control for a class of uncertain linear delay systems with actuator failures. When actuators suffer “serious failure” the never failed actuators can not stabilize the system, based on switching strategy of average dwell time method, under the condition that activation time ratio between the system without actuator failure and the sy...

Today we are approaching a truly connected and wireless world where users can be always connected by switching between different carriers and providers. This paper presents an architecture which enables mobile media applications to operate across a wide range of wireless networks, gracefully handle network failures and share environmental information, such as packet loss-rate or available bandw...

This paper focuses on the problem of reliable H∞ control for a class of switched nonlinear systems with actuator failures among a prespecified subset of actuators. In existing works, the reliable H∞ design methods are all based on a basic assumption that the never failed actuators must stabilize the given system. But when actuators suffer ”serious failure”– the never failed actuators can not st...

Differentiated Services (DiffServ) is scalable for deployment in today’s Internet, and Multiprotocol Label Switching (MPLS) provides fast packet switching and the opportunity for traffic engineering. Thus, the combination of DiffServ and MPLS presents a very attractive strategy to backbone network providers. This paper attempts to explain the concepts of DiffServ + MPLS and illustrate its effec...

Applying model-based diagnosis techniques to systems that exhibit hybrid behavior presents an interesting set of challenges that mostly revolve around interactions of the continuous and discrete components of the system. In many real world systems, the overall physical plant is inherently continuous, but system control is performed by a supervisory controller that imposes discrete switching beh...