Excellence in Research and Innovation for Humanity

Jung Min Yang

Publications

2

Publications

2
10005309
Asynchronous Sequential Machines with Fault Detectors
Abstract:
A strategy of fault diagnosis and tolerance for asynchronous sequential machines is discussed in this paper. With no synchronizing clock, it is difficult to diagnose an occurrence of permanent or stuck-in faults in the operation of asynchronous machines. In this paper, we present a fault detector comprised of a timer and a set of static functions to determine the occurrence of faults. In order to realize immediate fault tolerance, corrective control theory is applied to designing a dynamic feedback controller. Existence conditions for an appropriate controller and its construction algorithm are presented in terms of reachability of the machine and the feature of fault occurrences.
Keywords:
Asynchronous sequential machines, corrective control, fault diagnosis and tolerance, fault detector.
1
10007853
On Fault Diagnosis of Asynchronous Sequential Machines with Parallel Composition
Authors:
Abstract:
Fault diagnosis of composite asynchronous sequential machines with parallel composition is addressed in this paper. An adversarial input can infiltrate one of two submachines comprising the composite asynchronous machine, causing an unauthorized state transition. The objective is to characterize the condition under which the controller can diagnose any fault occurrence. Two control configurations, state feedback and output feedback, are considered in this paper. In the case of output feedback, the exact estimation of the state is impossible since the current state is inaccessible and the output feedback is given as the form of burst. A simple example is provided to demonstrate the proposed methodology.
Keywords:
Asynchronous sequential machines, parallel composition, fault diagnosis.