4,981 research outputs found
Distributed Adaptive Fault-Tolerant Control of Uncertain Multi-Agent Systems
This paper presents an adaptive fault-tolerant control (FTC) scheme for a
class of nonlinear uncertain multi-agent systems. A local FTC scheme is
designed for each agent using local measurements and suitable information
exchanged between neighboring agents. Each local FTC scheme consists of a fault
diagnosis module and a reconfigurable controller module comprised of a baseline
controller and two adaptive fault-tolerant controllers activated after fault
detection and after fault isolation, respectively. Under certain assumptions,
the closed-loop system's stability and leader-follower consensus properties are
rigorously established under different modes of the FTC system, including the
time-period before possible fault detection, between fault detection and
possible isolation, and after fault isolation
Hosting Byzantine Fault Tolerant Services on a Chord Ring
In this paper we demonstrate how stateful Byzantine Fault Tolerant services
may be hosted on a Chord ring. The strategy presented is fourfold: firstly a
replication scheme that dissociates the maintenance of replicated service state
from ring recovery is developed. Secondly, clients of the ring based services
are made replication aware. Thirdly, a consensus protocol is introduced that
supports the serialization of updates. Finally Byzantine fault tolerant
replication protocols are developed that ensure the integrity of service data
hosted on the ring.Comment: Submitted to DSN 2007 Workshop on Architecting Dependable System
Introduction to the special section on dependable network computing
Dependable network computing is becoming a key part of our daily economic and social life. Every day, millions of users and businesses are utilizing the Internet infrastructure for real-time electronic commerce transactions, scheduling important events, and building relationships. While network traffic and the number of users are rapidly growing, the mean-time between failures (MTTF) is surprisingly short; according to recent studies, in the majority of Internet backbone paths, the MTTF is 28 days. This leads to a strong requirement for highly dependable networks, servers, and software systems. The challenge is to build interconnected systems, based on available technology, that are inexpensive, accessible, scalable, and dependable. This special section provides insights into a number of these exciting challenges
- …